package.preload["fennel.repl"] = package.preload["fennel.repl"] or function(...)
local utils = require("fennel.utils")
local parser = require("fennel.parser")
local compiler = require("fennel.compiler")
local specials = require("fennel.specials")
local function default_read_chunk(parser_state)
local function _0_()
if (0 < parser_state["stack-size"]) then
return ".."
else
return ">> "
end
end
io.write(_0_())
io.flush()
local input = io.read()
return (input and (input .. "\n"))
end
local function default_on_values(xs)
io.write(table.concat(xs, "\9"))
return io.write("\n")
end
local function default_on_error(errtype, err, lua_source)
local function _1_()
local _0_0 = errtype
if (_0_0 == "Lua Compile") then
return ("Bad code generated - likely a bug with the compiler:\n" .. "--- Generated Lua Start ---\n" .. lua_source .. "--- Generated Lua End ---\n")
elseif (_0_0 == "Runtime") then
return (compiler.traceback(err, 4) .. "\n")
else
local _ = _0_0
return ("%s error: %s\n"):format(errtype, tostring(err))
end
end
return io.write(_1_())
end
local save_source = table.concat({"local ___i___ = 1", "while true do", " local name, value = debug.getlocal(1, ___i___)", " if(name and name ~= \"___i___\") then", " ___replLocals___[name] = value", " ___i___ = ___i___ + 1", " else break end end"}, "\n")
local function splice_save_locals(env, lua_source)
env.___replLocals___ = (env.___replLocals___ or {})
local spliced_source = {}
local bind = "local %s = ___replLocals___['%s']"
for line in lua_source:gmatch("([^\n]+)\n?") do
table.insert(spliced_source, line)
end
for name in pairs(env.___replLocals___) do
table.insert(spliced_source, 1, bind:format(name, name))
end
if ((1 < #spliced_source) and (spliced_source[#spliced_source]):match("^ *return .*$")) then
table.insert(spliced_source, #spliced_source, save_source)
end
return table.concat(spliced_source, "\n")
end
local function completer(env, scope, text)
local matches = {}
local input_fragment = text:gsub(".*[%s)(]+", "")
local function add_partials(input, tbl, prefix)
for k in utils.allpairs(tbl) do
local k0 = nil
if ((tbl == env) or (tbl == env.___replLocals___)) then
k0 = scope.unmanglings[k]
else
k0 = k
end
if ((#matches < 2000) and (type(k0) == "string") and (input == k0:sub(0, #input))) then
table.insert(matches, (prefix .. k0))
end
end
return nil
end
local function add_matches(input, tbl, prefix)
local prefix0 = nil
if prefix then
prefix0 = (prefix .. ".")
else
prefix0 = ""
end
if not input:find("%.") then
return add_partials(input, tbl, prefix0)
else
local head, tail = input:match("^([^.]+)%.(.*)")
local raw_head = nil
if ((tbl == env) or (tbl == env.___replLocals___)) then
raw_head = scope.manglings[head]
else
raw_head = head
end
if (type(tbl[raw_head]) == "table") then
return add_matches(tail, tbl[raw_head], (prefix0 .. head))
end
end
end
add_matches(input_fragment, (scope.specials or {}))
add_matches(input_fragment, (scope.macros or {}))
add_matches(input_fragment, (env.___replLocals___ or {}))
add_matches(input_fragment, env)
add_matches(input_fragment, (env._ENV or env._G or {}))
return matches
end
local function repl(options)
local old_root_options = utils.root.options
local env = nil
if options.env then
env = utils["wrap-env"](options.env)
else
env = setmetatable({}, {__index = (_G._ENV or _G)})
end
local save_locals_3f = ((options.saveLocals ~= false) and env.debug and env.debug.getlocal)
local opts = {}
local _ = nil
for k, v in pairs(options) do
opts[k] = v
end
_ = nil
local read_chunk = (opts.readChunk or default_read_chunk)
local on_values = (opts.onValues or default_on_values)
local on_error = (opts.onError or default_on_error)
local pp = (opts.pp or tostring)
local byte_stream, clear_stream = parser.granulate(read_chunk)
local chars = {}
local read, reset = nil, nil
local function _1_(parser_state)
local c = byte_stream(parser_state)
chars[(#chars + 1)] = c
return c
end
read, reset = parser.parser(_1_)
local scope = compiler["make-scope"]()
opts.useMetadata = (options.useMetadata ~= false)
if (opts.allowedGlobals == nil) then
opts.allowedGlobals = specials["current-global-names"](opts.env)
end
if opts.registerCompleter then
local function _3_(...)
return completer(env, scope, ...)
end
opts.registerCompleter(_3_)
end
local function loop()
for k in pairs(chars) do
chars[k] = nil
end
local ok, parse_ok_3f, x = pcall(read)
local src_string = string.char((_G.unpack or table.unpack)(chars))
utils.root.options = opts
if not ok then
on_error("Parse", parse_ok_3f)
clear_stream()
reset()
return loop()
else
if parse_ok_3f then
do
local _4_0, _5_0 = pcall(compiler.compile, x, {["assert-compile"] = opts["assert-compile"], ["parse-error"] = opts["parse-error"], correlate = opts.correlate, moduleName = opts.moduleName, scope = scope, source = src_string, useMetadata = opts.useMetadata})
if ((_4_0 == false) and (nil ~= _5_0)) then
local msg = _5_0
clear_stream()
on_error("Compile", msg)
elseif ((_4_0 == true) and (nil ~= _5_0)) then
local source = _5_0
local source0 = nil
if save_locals_3f then
source0 = splice_save_locals(env, source)
else
source0 = source
end
local lua_ok_3f, loader = pcall(specials["load-code"], source0, env)
if not lua_ok_3f then
clear_stream()
on_error("Lua Compile", loader, source0)
else
local _7_0, _8_0 = nil, nil
local function _9_()
return {loader()}
end
local function _10_(...)
return on_error("Runtime", ...)
end
_7_0, _8_0 = xpcall(_9_, _10_)
if ((_7_0 == true) and (nil ~= _8_0)) then
local ret = _8_0
env._ = ret[1]
env.__ = ret
on_values(utils.map(ret, pp))
end
end
end
end
utils.root.options = old_root_options
return loop()
end
end
end
return loop()
end
return repl
end
package.preload["fennel.specials"] = package.preload["fennel.specials"] or function(...)
local utils = require("fennel.utils")
local parser = require("fennel.parser")
local compiler = require("fennel.compiler")
local unpack = (_G.unpack or table.unpack)
local SPECIALS = compiler.scopes.global.specials
local function wrap_env(env)
local function _0_(_, key)
if (type(key) == "string") then
return env[compiler["global-unmangling"](key)]
else
return env[key]
end
end
local function _1_(_, key, value)
if (type(key) == "string") then
env[compiler["global-unmangling"](key)] = value
return nil
else
env[key] = value
return nil
end
end
local function _2_()
local function putenv(k, v)
local _3_
if (type(k) == "string") then
_3_ = compiler["global-unmangling"](k)
else
_3_ = k
end
return _3_, v
end
return next, utils.kvmap(env, putenv), nil
end
return setmetatable({}, {__index = _0_, __newindex = _1_, __pairs = _2_})
end
local function current_global_names(env)
return utils.kvmap((env or _G), compiler["global-unmangling"])
end
local function load_code(code, environment, filename)
local environment0 = ((environment or _ENV) or _G)
if (_G.setfenv and _G.loadstring) then
local f = assert(_G.loadstring(code, filename))
_G.setfenv(f, environment0)
return f
else
return assert(load(code, filename, "t", environment0))
end
end
local function doc_2a(tgt, name)
if not tgt then
return (name .. " not found")
else
local docstring = (((compiler.metadata):get(tgt, "fnl/docstring") or "#<undocumented>")):gsub("\n$", ""):gsub("\n", "\n ")
if (type(tgt) == "function") then
local arglist = table.concat(((compiler.metadata):get(tgt, "fnl/arglist") or {"#<unknown-arguments>"}), " ")
local _0_
if (#arglist > 0) then
_0_ = " "
else
_0_ = ""
end
return string.format("(%s%s%s)\n %s", name, _0_, arglist, docstring)
else
return string.format("%s\n %s", name, docstring)
end
end
end
local function doc_special(name, arglist, docstring)
compiler.metadata[SPECIALS[name]] = {["fnl/arglist"] = arglist, ["fnl/docstring"] = docstring}
return nil
end
local function compile_do(ast, scope, parent, start)
local start0 = (start or 2)
local len = #ast
local sub_scope = compiler["make-scope"](scope)
for i = start0, len do
compiler.compile1(ast[i], sub_scope, parent, {nval = 0})
end
return nil
end
SPECIALS["do"] = function(ast, scope, parent, opts, start, chunk, sub_scope, pre_syms)
local start0 = (start or 2)
local sub_scope0 = (sub_scope or compiler["make-scope"](scope))
local chunk0 = (chunk or {})
local len = #ast
local outer_target = opts.target
local outer_tail = opts.tail
local retexprs = {returned = true}
if (not outer_target and (opts.nval ~= 0) and not outer_tail) then
if opts.nval then
local syms = {}
for i = 1, opts.nval, 1 do
local s = ((pre_syms and pre_syms[i]) or compiler.gensym(scope))
syms[i] = s
retexprs[i] = utils.expr(s, "sym")
end
outer_target = table.concat(syms, ", ")
compiler.emit(parent, ("local %s"):format(outer_target), ast)
compiler.emit(parent, "do", ast)
else
local fname = compiler.gensym(scope)
local fargs = ((scope.vararg and "...") or "")
compiler.emit(parent, ("local function %s(%s)"):format(fname, fargs), ast)
retexprs = utils.expr((fname .. "(" .. fargs .. ")"), "statement")
outer_tail = true
outer_target = nil
end
else
compiler.emit(parent, "do", ast)
end
if (len < start0) then
compiler.compile1(nil, sub_scope0, chunk0, {tail = outer_tail, target = outer_target})
else
for i = start0, len do
local subopts = {nval = (((i ~= len) and 0) or opts.nval), tail = (((i == len) and outer_tail) or nil), target = (((i == len) and outer_target) or nil)}
utils["propagate-options"](opts, subopts)
local subexprs = compiler.compile1(ast[i], sub_scope0, chunk0, subopts)
if (i ~= len) then
compiler["keep-side-effects"](subexprs, parent, nil, ast[i])
end
end
end
compiler.emit(parent, chunk0, ast)
compiler.emit(parent, "end", ast)
return retexprs
end
doc_special("do", {"..."}, "Evaluate multiple forms; return last value.")
SPECIALS.values = function(ast, scope, parent)
local len = #ast
local exprs = {}
for i = 2, len do
local subexprs = compiler.compile1(ast[i], scope, parent, {nval = ((i ~= len) and 1)})
exprs[(#exprs + 1)] = subexprs[1]
if (i == len) then
for j = 2, #subexprs, 1 do
exprs[(#exprs + 1)] = subexprs[j]
end
end
end
return exprs
end
doc_special("values", {"..."}, "Return multiple values from a function. Must be in tail position.")
SPECIALS.fn = function(ast, scope, parent)
local index, fn_name, is_local_fn, docstring = 2, utils["is-sym"](ast[2])
local f_scope = nil
do
local _0_0 = compiler["make-scope"](scope)
_0_0["vararg"] = false
f_scope = _0_0
end
local f_chunk = {}
local multi = (fn_name and utils["is-multi-sym"](fn_name[1]))
compiler.assert((not multi or not multi["multi-sym-method-call"]), ("unexpected multi symbol " .. tostring(fn_name)), ast[index])
if (fn_name and (fn_name[1] ~= "nil")) then
is_local_fn = not multi
if is_local_fn then
fn_name = compiler["declare-local"](fn_name, {}, scope, ast)
else
fn_name = compiler["symbol-to-expression"](fn_name, scope)[1]
end
index = (index + 1)
else
is_local_fn = true
fn_name = compiler.gensym(scope)
end
do
local arg_list = nil
local function _2_()
if (type(ast[index]) == "table") then
return ast[index]
else
return ast
end
end
arg_list = compiler.assert(utils["is-table"](ast[index]), "expected parameters", _2_())
local function get_arg_name(i, name)
if utils["is-varg"](name) then
compiler.assert((i == #arg_list), "expected vararg as last parameter", ast[2])
f_scope.vararg = true
return "..."
elseif (utils["is-sym"](name) and (utils.deref(name) ~= "nil") and not utils["is-multi-sym"](utils.deref(name))) then
return compiler["declare-local"](name, {}, f_scope, ast)
elseif utils["is-table"](name) then
local raw = utils.sym(compiler.gensym(scope))
local declared = compiler["declare-local"](raw, {}, f_scope, ast)
compiler.destructure(name, raw, ast, f_scope, f_chunk, {declaration = true, nomulti = true})
return declared
else
return compiler.assert(false, ("expected symbol for function parameter: %s"):format(tostring(name)), ast[2])
end
end
local arg_name_list = utils.kvmap(arg_list, get_arg_name)
if ((type(ast[(index + 1)]) == "string") and ((index + 1) < #ast)) then
index = (index + 1)
docstring = ast[index]
end
for i = (index + 1), #ast, 1 do
compiler.compile1(ast[i], f_scope, f_chunk, {nval = (((i ~= #ast) and 0) or nil), tail = (i == #ast)})
end
if is_local_fn then
compiler.emit(parent, ("local function %s(%s)"):format(fn_name, table.concat(arg_name_list, ", ")), ast)
else
compiler.emit(parent, ("%s = function(%s)"):format(fn_name, table.concat(arg_name_list, ", ")), ast)
end
compiler.emit(parent, f_chunk, ast)
compiler.emit(parent, "end", ast)
if utils.root.options.useMetadata then
local args = nil
local function _5_(v)
if utils["is-table"](v) then
return "\"#<table>\""
else
return ("\"%s\""):format(tostring(v))
end
end
args = utils.map(arg_list, _5_)
local meta_fields = {"\"fnl/arglist\"", ("{" .. table.concat(args, ", ") .. "}")}
if docstring then
table.insert(meta_fields, "\"fnl/docstring\"")
table.insert(meta_fields, ("\"" .. docstring:gsub("%s+$", ""):gsub("\\", "\\\\"):gsub("\n", "\\n"):gsub("\"", "\\\"") .. "\""))
end
local meta_str = ("require(\"%s\").metadata"):format((utils.root.options.moduleName or "fennel"))
compiler.emit(parent, ("pcall(function() %s:setall(%s, %s) end)"):format(meta_str, fn_name, table.concat(meta_fields, ", ")))
end
end
return utils.expr(fn_name, "sym")
end
doc_special("fn", {"name?", "args", "docstring?", "..."}, "Function syntax. May optionally include a name and docstring.\nIf a name is provided, the function will be bound in the current scope.\nWhen called with the wrong number of args, excess args will be discarded\nand lacking args will be nil, use lambda for arity-checked functions.")
SPECIALS.lua = function(ast, _, parent)
compiler.assert(((#ast == 2) or (#ast == 3)), "expected 1 or 2 arguments", ast)
if (ast[2] ~= nil) then
table.insert(parent, {ast = ast, leaf = tostring(ast[2])})
end
if (#ast == 3) then
return tostring(ast[3])
end
end
SPECIALS.doc = function(ast, scope, parent)
assert(utils.root.options.useMetadata, "can't look up doc with metadata disabled.")
compiler.assert((#ast == 2), "expected one argument", ast)
local target = utils.deref(ast[2])
local special_or_macro = (scope.specials[target] or scope.macros[target])
if special_or_macro then
return ("print([[%s]])"):format(doc_2a(special_or_macro, target))
else
local value = tostring(compiler.compile1(ast[2], scope, parent, {nval = 1})[1])
return ("print(require('%s').doc(%s, '%s'))"):format((utils.root.options.moduleName or "fennel"), value, tostring(ast[2]))
end
end
doc_special("doc", {"x"}, "Print the docstring and arglist for a function, macro, or special form.")
local function dot(ast, scope, parent)
compiler.assert((1 < #ast), "expected table argument", ast)
local len = #ast
local lhs = compiler.compile1(ast[2], scope, parent, {nval = 1})
if (len == 2) then
return tostring(lhs[1])
else
local indices = {}
for i = 3, len, 1 do
local index = ast[i]
if ((type(index) == "string") and utils["is-valid-lua-identifier"](index)) then
table.insert(indices, ("." .. index))
else
index = compiler.compile1(index, scope, parent, {nval = 1})[1]
table.insert(indices, ("[" .. tostring(index) .. "]"))
end
end
if utils["is-table"](ast[2]) then
return ("(" .. tostring(lhs[1]) .. ")" .. table.concat(indices))
else
return (tostring(lhs[1]) .. table.concat(indices))
end
end
end
SPECIALS["."] = dot
doc_special(".", {"tbl", "key1", "..."}, "Look up key1 in tbl table. If more args are provided, do a nested lookup.")
SPECIALS.global = function(ast, scope, parent)
compiler.assert((#ast == 3), "expected name and value", ast)
compiler.destructure(ast[2], ast[3], ast, scope, parent, {forceglobal = true, nomulti = true})
return nil
end
doc_special("global", {"name", "val"}, "Set name as a global with val.")
SPECIALS.set = function(ast, scope, parent)
compiler.assert((#ast == 3), "expected name and value", ast)
compiler.destructure(ast[2], ast[3], ast, scope, parent, {noundef = true})
return nil
end
doc_special("set", {"name", "val"}, "Set a local variable to a new value. Only works on locals using var.")
local function set_forcibly_21_2a(ast, scope, parent)
compiler.assert((#ast == 3), "expected name and value", ast)
compiler.destructure(ast[2], ast[3], ast, scope, parent, {forceset = true})
return nil
end
SPECIALS["set-forcibly!"] = set_forcibly_21_2a
local function local_2a(ast, scope, parent)
compiler.assert((#ast == 3), "expected name and value", ast)
compiler.destructure(ast[2], ast[3], ast, scope, parent, {declaration = true, nomulti = true})
return nil
end
SPECIALS["local"] = local_2a
doc_special("local", {"name", "val"}, "Introduce new top-level immutable local.")
SPECIALS.var = function(ast, scope, parent)
compiler.assert((#ast == 3), "expected name and value", ast)
compiler.destructure(ast[2], ast[3], ast, scope, parent, {declaration = true, isvar = true, nomulti = true})
return nil
end
doc_special("var", {"name", "val"}, "Introduce new mutable local.")
SPECIALS.let = function(ast, scope, parent, opts)
local bindings = ast[2]
local pre_syms = {}
compiler.assert((utils["is-list"](bindings) or utils["is-table"](bindings)), "expected binding table", ast)
compiler.assert(((#bindings % 2) == 0), "expected even number of name/value bindings", ast[2])
compiler.assert((#ast >= 3), "expected body expression", ast[1])
for _ = 1, (opts.nval or 0), 1 do
table.insert(pre_syms, compiler.gensym(scope))
end
local sub_scope = compiler["make-scope"](scope)
local sub_chunk = {}
for i = 1, #bindings, 2 do
compiler.destructure(bindings[i], bindings[(i + 1)], ast, sub_scope, sub_chunk, {declaration = true, nomulti = true})
end
return SPECIALS["do"](ast, scope, parent, opts, 3, sub_chunk, sub_scope, pre_syms)
end
doc_special("let", {"[name1 val1 ... nameN valN]", "..."}, "Introduces a new scope in which a given set of local bindings are used.")
SPECIALS.tset = function(ast, scope, parent)
compiler.assert((#ast > 3), "expected table, key, and value arguments", ast)
local root = compiler.compile1(ast[2], scope, parent, {nval = 1})[1]
local keys = {}
for i = 3, (#ast - 1), 1 do
local key = compiler.compile1(ast[i], scope, parent, {nval = 1})[1]
keys[(#keys + 1)] = tostring(key)
end
local value = compiler.compile1(ast[#ast], scope, parent, {nval = 1})[1]
local rootstr = tostring(root)
local fmtstr = nil
if rootstr:match("^{") then
fmtstr = "do end (%s)[%s] = %s"
else
fmtstr = "%s[%s] = %s"
end
return compiler.emit(parent, fmtstr:format(tostring(root), table.concat(keys, "]["), tostring(value)), ast)
end
doc_special("tset", {"tbl", "key1", "...", "keyN", "val"}, "Set the value of a table field. Can take additional keys to set\nnested values, but all parents must contain an existing table.")
local function if_2a(ast, scope, parent, opts)
local do_scope = compiler["make-scope"](scope)
local branches = {}
local has_else = ((#ast > 3) and ((#ast % 2) == 0))
local else_branch = nil
local wrapper, inner_tail, inner_target, target_exprs = nil
if (opts.tail or opts.target or opts.nval) then
if (opts.nval and (opts.nval ~= 0) and not opts.target) then
local accum = {}
target_exprs = {}
for i = 1, opts.nval, 1 do
local s = compiler.gensym(scope)
accum[i] = s
target_exprs[i] = utils.expr(s, "sym")
end
wrapper, inner_tail, inner_target = "target", opts.tail, table.concat(accum, ", ")
else
wrapper, inner_tail, inner_target = "none", opts.tail, opts.target
end
else
wrapper, inner_tail, inner_target = "iife", true, nil
end
local body_opts = {nval = opts.nval, tail = inner_tail, target = inner_target}
local function compile_body(i)
local chunk = {}
local cscope = compiler["make-scope"](do_scope)
compiler["keep-side-effects"](compiler.compile1(ast[i], cscope, chunk, body_opts), chunk, nil, ast[i])
return {chunk = chunk, scope = cscope}
end
for i = 2, (#ast - 1), 2 do
local condchunk = {}
local res = compiler.compile1(ast[i], do_scope, condchunk, {nval = 1})
local cond = res[1]
local branch = compile_body((i + 1))
branch.cond = cond
branch.condchunk = condchunk
branch.nested = ((i ~= 2) and (next(condchunk, nil) == nil))
table.insert(branches, branch)
end
if has_else then
else_branch = compile_body(#ast)
end
local s = compiler.gensym(scope)
local buffer = {}
local last_buffer = buffer
for i = 1, #branches do
local branch = branches[i]
local fstr = nil
if not branch.nested then
fstr = "if %s then"
else
fstr = "elseif %s then"
end
local cond = tostring(branch.cond)
local cond_line = nil
if ((cond == "true") and branch.nested and (i == #branches)) then
cond_line = "else"
else
cond_line = fstr:format(cond)
end
if branch.nested then
compiler.emit(last_buffer, branch.condchunk, ast)
else
for _, v in ipairs(branch.condchunk) do
compiler.emit(last_buffer, v, ast)
end
end
compiler.emit(last_buffer, cond_line, ast)
compiler.emit(last_buffer, branch.chunk, ast)
if (i == #branches) then
if has_else then
compiler.emit(last_buffer, "else", ast)
compiler.emit(last_buffer, else_branch.chunk, ast)
elseif (inner_target and (cond_line ~= "else")) then
compiler.emit(last_buffer, "else", ast)
compiler.emit(last_buffer, ("%s = nil"):format(inner_target), ast)
end
compiler.emit(last_buffer, "end", ast)
elseif not branches[(i + 1)].nested then
local next_buffer = {}
compiler.emit(last_buffer, "else", ast)
compiler.emit(last_buffer, next_buffer, ast)
compiler.emit(last_buffer, "end", ast)
last_buffer = next_buffer
end
end
if (wrapper == "iife") then
local iifeargs = ((scope.vararg and "...") or "")
compiler.emit(parent, ("local function %s(%s)"):format(tostring(s), iifeargs), ast)
compiler.emit(parent, buffer, ast)
compiler.emit(parent, "end", ast)
return utils.expr(("%s(%s)"):format(tostring(s), iifeargs), "statement")
elseif (wrapper == "none") then
for i = 1, #buffer, 1 do
compiler.emit(parent, buffer[i], ast)
end
return {returned = true}
else
compiler.emit(parent, ("local %s"):format(inner_target), ast)
for i = 1, #buffer, 1 do
compiler.emit(parent, buffer[i], ast)
end
return target_exprs
end
end
SPECIALS["if"] = if_2a
doc_special("if", {"cond1", "body1", "...", "condN", "bodyN"}, "Conditional form.\nTakes any number of condition/body pairs and evaluates the first body where\nthe condition evaluates to truthy. Similar to cond in other lisps.")
SPECIALS.each = function(ast, scope, parent)
compiler.assert((#ast >= 3), "expected body expression", ast[1])
local binding = compiler.assert(utils["is-table"](ast[2]), "expected binding table", ast)
local iter = table.remove(binding, #binding)
local destructures = {}
local new_manglings = {}
local sub_scope = compiler["make-scope"](scope)
local function destructure_binding(v)
if utils["is-sym"](v) then
return compiler["declare-local"](v, {}, sub_scope, ast, new_manglings)
else
local raw = utils.sym(compiler.gensym(sub_scope))
destructures[raw] = v
return compiler["declare-local"](raw, {}, sub_scope, ast)
end
end
local bind_vars = utils.map(binding, destructure_binding)
local vals = compiler.compile1(iter, sub_scope, parent)
local val_names = utils.map(vals, tostring)
local chunk = {}
compiler.emit(parent, ("for %s in %s do"):format(table.concat(bind_vars, ", "), table.concat(val_names, ", ")), ast)
for raw, args in utils.stablepairs(destructures) do
compiler.destructure(args, raw, ast, sub_scope, chunk, {declaration = true, nomulti = true})
end
compiler["apply-manglings"](sub_scope, new_manglings, ast)
compile_do(ast, sub_scope, chunk, 3)
compiler.emit(parent, chunk, ast)
return compiler.emit(parent, "end", ast)
end
doc_special("each", {"[key value (iterator)]", "..."}, "Runs the body once for each set of values provided by the given iterator.\nMost commonly used with ipairs for sequential tables or pairs for undefined\norder, but can be used with any iterator.")
local function while_2a(ast, scope, parent)
local len1 = #parent
local condition = compiler.compile1(ast[2], scope, parent, {nval = 1})[1]
local len2 = #parent
local sub_chunk = {}
if (len1 ~= len2) then
for i = (len1 + 1), len2, 1 do
sub_chunk[(#sub_chunk + 1)] = parent[i]
parent[i] = nil
end
compiler.emit(parent, "while true do", ast)
compiler.emit(sub_chunk, ("if not %s then break end"):format(condition[1]), ast)
else
compiler.emit(parent, ("while " .. tostring(condition) .. " do"), ast)
end
compile_do(ast, compiler["make-scope"](scope), sub_chunk, 3)
compiler.emit(parent, sub_chunk, ast)
return compiler.emit(parent, "end", ast)
end
SPECIALS["while"] = while_2a
doc_special("while", {"condition", "..."}, "The classic while loop. Evaluates body until a condition is non-truthy.")
local function for_2a(ast, scope, parent)
local ranges = compiler.assert(utils["is-table"](ast[2]), "expected binding table", ast)
local binding_sym = table.remove(ast[2], 1)
local sub_scope = compiler["make-scope"](scope)
local range_args = {}
local chunk = {}
compiler.assert(utils["is-sym"](binding_sym), ("unable to bind %s %s"):format(type(binding_sym), tostring(binding_sym)), ast[2])
compiler.assert((#ast >= 3), "expected body expression", ast[1])
for i = 1, math.min(#ranges, 3), 1 do
range_args[i] = tostring(compiler.compile1(ranges[i], sub_scope, parent, {nval = 1})[1])
end
compiler.emit(parent, ("for %s = %s do"):format(compiler["declare-local"](binding_sym, {}, sub_scope, ast), table.concat(range_args, ", ")), ast)
compile_do(ast, sub_scope, chunk, 3)
compiler.emit(parent, chunk, ast)
return compiler.emit(parent, "end", ast)
end
SPECIALS["for"] = for_2a
doc_special("for", {"[index start stop step?]", "..."}, "Numeric loop construct.\nEvaluates body once for each value between start and stop (inclusive).")
local function once(val, ast, scope, parent)
if ((val.type == "statement") or (val.type == "expression")) then
local s = compiler.gensym(scope)
compiler.emit(parent, ("local %s = %s"):format(s, tostring(val)), ast)
return utils.expr(s, "sym")
else
return val
end
end
local function method_call(ast, scope, parent)
compiler.assert((#ast >= 3), "expected at least 2 arguments", ast)
local objectexpr = compiler.compile1(ast[2], scope, parent, {nval = 1})[1]
local methodident, methodstring = false
if ((type(ast[3]) == "string") and utils["is-valid-lua-identifier"](ast[3])) then
methodident = true
methodstring = ast[3]
else
methodstring = tostring(compiler.compile1(ast[3], scope, parent, {nval = 1})[1])
objectexpr = once(objectexpr, ast[2], scope, parent)
end
local args = {}
for i = 4, #ast, 1 do
local subexprs = nil
local _1_
if (i ~= #ast) then
_1_ = 1
else
_1_ = nil
end
subexprs = compiler.compile1(ast[i], scope, parent, {nval = _1_})
utils.map(subexprs, tostring, args)
end
local fstring = nil
if not methodident then
table.insert(args, 1, tostring(objectexpr))
if (objectexpr.type == "sym") then
fstring = "%s[%s](%s)"
else
fstring = "(%s)[%s](%s)"
end
elseif ((objectexpr.type == "literal") or (objectexpr.type == "expression")) then
fstring = "(%s):%s(%s)"
else
fstring = "%s:%s(%s)"
end
return utils.expr(fstring:format(tostring(objectexpr), methodstring, table.concat(args, ", ")), "statement")
end
SPECIALS[":"] = method_call
doc_special(":", {"tbl", "method-name", "..."}, "Call the named method on tbl with the provided args.\nMethod name doesn't have to be known at compile-time; if it is, use\n(tbl:method-name ...) instead.")
SPECIALS.comment = function(ast, _, parent)
local els = {}
for i = 2, #ast, 1 do
els[(#els + 1)] = tostring(ast[i]):gsub("\n", " ")
end
return compiler.emit(parent, ("-- " .. table.concat(els, " ")), ast)
end
doc_special("comment", {"..."}, "Comment which will be emitted in Lua output.")
SPECIALS.hashfn = function(ast, scope, parent)
compiler.assert((#ast == 2), "expected one argument", ast)
local f_scope = nil
do
local _0_0 = compiler["make-scope"](scope)
_0_0["vararg"] = false
_0_0["hashfn"] = true
f_scope = _0_0
end
local f_chunk = {}
local name = compiler.gensym(scope)
local symbol = utils.sym(name)
compiler["declare-local"](symbol, {}, scope, ast)
local args = {}
for i = 1, 9 do
args[i] = compiler["declare-local"](utils.sym(("$" .. i)), {}, f_scope, ast)
end
local function walker(idx, node, parent_node)
if (utils["is-sym"](node) and (utils.deref(node) == "$...")) then
parent_node[idx] = utils.varg()
f_scope.vararg = true
return nil
else
return (utils["is-list"](node) or utils["is-table"](node))
end
end
utils["walk-tree"](ast[2], walker)
compiler.compile1(ast[2], f_scope, f_chunk, {tail = true})
local max_used = 0
for i = 1, 9, 1 do
if f_scope.symmeta[("$" .. i)].used then
max_used = i
end
end
if f_scope.vararg then
compiler.assert((max_used == 0), "$ and $... in hashfn are mutually exclusive", ast)
args = {utils.deref(utils.varg())}
max_used = 1
end
local arg_str = table.concat(args, ", ", 1, max_used)
compiler.emit(parent, ("local function %s(%s)"):format(name, arg_str), ast)
compiler.emit(parent, f_chunk, ast)
compiler.emit(parent, "end", ast)
return utils.expr(name, "sym")
end
doc_special("hashfn", {"..."}, "Function literal shorthand; args are either $... OR $1, $2, etc.")
local function define_arithmetic_special(name, zero_arity, unary_prefix, lua_name)
do
local padded_op = (" " .. (lua_name or name) .. " ")
local function _0_(ast, scope, parent)
local len = #ast
if (len == 1) then
compiler.assert((zero_arity ~= nil), "Expected more than 0 arguments", ast)
return utils.expr(zero_arity, "literal")
else
local operands = {}
for i = 2, len, 1 do
local subexprs = nil
local _1_
if (i == 1) then
_1_ = 1
else
_1_ = nil
end
subexprs = compiler.compile1(ast[i], scope, parent, {nval = _1_})
utils.map(subexprs, tostring, operands)
end
if (#operands == 1) then
if unary_prefix then
return ("(" .. unary_prefix .. padded_op .. operands[1] .. ")")
else
return operands[1]
end
else
return ("(" .. table.concat(operands, padded_op) .. ")")
end
end
end
SPECIALS[name] = _0_
end
return doc_special(name, {"a", "b", "..."}, "Arithmetic operator; works the same as Lua but accepts more arguments.")
end
define_arithmetic_special("+", "0")
define_arithmetic_special("..", "''")
define_arithmetic_special("^")
define_arithmetic_special("-", nil, "")
define_arithmetic_special("*", "1")
define_arithmetic_special("%")
define_arithmetic_special("/", nil, "1")
define_arithmetic_special("//", nil, "1")
define_arithmetic_special("lshift", nil, "1", "<<")
define_arithmetic_special("rshift", nil, "1", ">>")
define_arithmetic_special("band", "0", "0", "&")
define_arithmetic_special("bor", "0", "0", "|")
define_arithmetic_special("bxor", "0", "0", "~")
doc_special("lshift", {"x", "n"}, "Bitwise logical left shift of x by n bits; only works in Lua 5.3+.")
doc_special("rshift", {"x", "n"}, "Bitwise logical right shift of x by n bits; only works in Lua 5.3+.")
doc_special("band", {"x1", "x2"}, "Bitwise AND of arguments; only works in Lua 5.3+.")
doc_special("bor", {"x1", "x2"}, "Bitwise OR of arguments; only works in Lua 5.3+.")
doc_special("bxor", {"x1", "x2"}, "Bitwise XOR of arguments; only works in Lua 5.3+.")
define_arithmetic_special("or", "false")
define_arithmetic_special("and", "true")
doc_special("and", {"a", "b", "..."}, "Boolean operator; works the same as Lua but accepts more arguments.")
doc_special("or", {"a", "b", "..."}, "Boolean operator; works the same as Lua but accepts more arguments.")
doc_special("..", {"a", "b", "..."}, "String concatenation operator; works the same as Lua but accepts more arguments.")
local function define_comparator_special(name, realop, chain_op)
do
local op = (realop or name)
local function opfn(ast, scope, parent)
local len = #ast
compiler.assert((len > 2), "expected at least two arguments", ast)
local lhs = compiler.compile1(ast[2], scope, parent, {nval = 1})[1]
local lastval = compiler.compile1(ast[3], scope, parent, {nval = 1})[1]
if (len > 3) then
lastval = once(lastval, ast[3], scope, parent)
end
local out = ("(%s %s %s)"):format(tostring(lhs), op, tostring(lastval))
if (len > 3) then
for i = 4, len do
local nextval = once(compiler.compile1(ast[i], scope, parent, {nval = 1})[1], ast[i], scope, parent)
out = ((out .. " %s (%s %s %s)")):format((chain_op or "and"), tostring(lastval), op, tostring(nextval))
lastval = nextval
end
out = ("(" .. out .. ")")
end
return out
end
SPECIALS[name] = opfn
end
return doc_special(name, {"a", "b", "..."}, "Comparison operator; works the same as Lua but accepts more arguments.")
end
define_comparator_special(">")
define_comparator_special("<")
define_comparator_special(">=")
define_comparator_special("<=")
define_comparator_special("=", "==")
define_comparator_special("not=", "~=", "or")
SPECIALS["~="] = SPECIALS["not="]
local function define_unary_special(op, realop)
local function opfn(ast, scope, parent)
compiler.assert((#ast == 2), "expected one argument", ast)
local tail = compiler.compile1(ast[2], scope, parent, {nval = 1})
return ((realop or op) .. tostring(tail[1]))
end
SPECIALS[op] = opfn
return nil
end
define_unary_special("not", "not ")
doc_special("not", {"x"}, "Logical operator; works the same as Lua.")
define_unary_special("bnot", "~")
doc_special("bnot", {"x"}, "Bitwise negation; only works in Lua 5.3+.")
define_unary_special("length", "#")
doc_special("length", {"x"}, "Returns the length of a table or string.")
SPECIALS["#"] = SPECIALS.length
SPECIALS.quote = function(ast, scope, parent)
compiler.assert((#ast == 2), "expected one argument")
local runtime, this_scope = true, scope
while this_scope do
this_scope = this_scope.parent
if (this_scope == compiler.scopes.compiler) then
runtime = false
end
end
return compiler["do-quote"](ast[2], scope, parent, runtime)
end
doc_special("quote", {"x"}, "Quasiquote the following form. Only works in macro/compiler scope.")
local function make_compiler_env(ast, scope, parent)
local function _0_()
return compiler.scopes.macro
end
local function _1_(symbol)
compiler.assert(compiler.scopes.macro, "must call from macro", ast)
return compiler.scopes.macro.manglings[tostring(symbol)]
end
local function _2_()
return utils.sym(compiler.gensym((compiler.scopes.macro or scope)))
end
local function _3_(form)
compiler.assert(compiler.scopes.macro, "must call from macro", ast)
return compiler.macroexpand(form, compiler.scopes.macro)
end
return setmetatable({["get-scope"] = _0_, ["in-scope?"] = _1_, ["list?"] = utils["is-list"], ["multi-sym?"] = utils["is-multi-sym"], ["sequence?"] = utils["is-sequence"], ["sym?"] = utils["is-sym"], ["table?"] = utils["is-table"], ["varg?"] = utils["is-varg"], _AST = ast, _CHUNK = parent, _IS_COMPILER = true, _SCOPE = scope, _SPECIALS = compiler.scopes.global.specials, _VARARG = utils.varg(), fennel = utils["fennel-module"], gensym = _2_, list = utils.list, macroexpand = _3_, sequence = utils.sequence, sym = utils.sym, unpack = unpack}, {__index = (_ENV or _G)})
end
local cfg = string.gmatch(package.config, "([^\n]+)")
local dirsep, pathsep, pathmark = (cfg() or "/"), (cfg() or ";"), (cfg() or "?")
local pkg_config = {dirsep = dirsep, pathmark = pathmark, pathsep = pathsep}
local function escapepat(str)
return string.gsub(str, "[^%w]", "%%%1")
end
local function search_module(modulename, pathstring)
local pathsepesc = escapepat(pkg_config.pathsep)
local pattern = ("([^%s]*)%s"):format(pathsepesc, pathsepesc)
local no_dot_module = modulename:gsub("%.", pkg_config.dirsep)
local fullpath = ((pathstring or utils["fennel-module"].path) .. pkg_config.pathsep)
local function try_path(path)
local filename = path:gsub(escapepat(pkg_config.pathmark), no_dot_module)
local filename2 = path:gsub(escapepat(pkg_config.pathmark), modulename)
local _0_0 = (io.open(filename) or io.open(filename2))
if (nil ~= _0_0) then
local file = _0_0
file:close()
return filename
end
end
local function find_in_path(start)
local _0_0 = fullpath:match(pattern, start)
if (nil ~= _0_0) then
local path = _0_0
return (try_path(path) or find_in_path((start + #path + 1)))
end
end
return find_in_path(1)
end
local function make_searcher(options)
local opts = utils.copy(utils.root.options)
for k, v in pairs((options or {})) do
opts[k] = v
end
local function _0_(module_name)
local filename = search_module(module_name)
if filename then
local function _1_(mod_name)
return utils["fennel-module"].dofile(filename, opts, mod_name)
end
return _1_
end
end
return _0_
end
local function macro_globals(env, globals)
local allowed = current_global_names(env)
for _, k in pairs((globals or {})) do
table.insert(allowed, k)
end
return allowed
end
local function add_macros(macros_2a, ast, scope)
compiler.assert(utils["is-table"](macros_2a), "expected macros to be table", ast)
for k, v in pairs(macros_2a) do
compiler.assert((type(v) == "function"), "expected each macro to be function", ast)
scope.macros[k] = v
end
return nil
end
local function load_macros(modname, ast, scope, parent)
local filename = compiler.assert(search_module(modname), (modname .. " module not found."), ast)
local env = make_compiler_env(ast, scope, parent)
local globals = macro_globals(env, current_global_names())
return utils["fennel-module"].dofile(filename, {allowedGlobals = globals, env = env, scope = compiler.scopes.compiler, useMetadata = utils.root.options.useMetadata})
end
local macro_loaded = {}
SPECIALS["require-macros"] = function(ast, scope, parent)
compiler.assert((#ast == 2), "Expected one module name argument", ast)
local modname = ast[2]
if not macro_loaded[modname] then
macro_loaded[modname] = load_macros(modname, ast, scope, parent)
end
return add_macros(macro_loaded[modname], ast, scope, parent)
end
doc_special("require-macros", {"macro-module-name"}, "Load given module and use its contents as macro definitions in current scope.\nMacro module should return a table of macro functions with string keys.\nConsider using import-macros instead as it is more flexible.")
local function emit_fennel(src, path, opts, sub_chunk)
local subscope = compiler["make-scope"](utils.root.scope.parent)
local forms = {}
if utils.root.options.requireAsInclude then
subscope.specials.require = compiler["require-include"]
end
for _, val in parser.parser(parser["string-stream"](src), path) do
table.insert(forms, val)
end
for i = 1, #forms do
local subopts = nil
if (i == #forms) then
subopts = {nval = 1, tail = true}
else
subopts = {nval = 0}
end
utils["propagate-options"](opts, subopts)
compiler.compile1(forms[i], subscope, sub_chunk, subopts)
end
return nil
end
local function include_path(ast, opts, path, mod, fennel_3f)
utils.root.scope.includes[mod] = "fnl/loading"
local src = nil
do
local f = assert(io.open(path))
local function close_handlers_0_(ok_0_, ...)
f:close()
if ok_0_ then
return ...
else
return error(..., 0)
end
end
local function _0_()
return f:read("*all"):gsub("[\13\n]*$", "")
end
src = close_handlers_0_(xpcall(_0_, (package.loaded.fennel or debug).traceback))
end
local ret = utils.expr(("require(\"" .. mod .. "\")"), "statement")
local target = ("package.preload[%q]"):format(mod)
local preload_str = (target .. " = " .. target .. " or function(...)")
local temp_chunk, sub_chunk = {}, {}
compiler.emit(temp_chunk, preload_str, ast)
compiler.emit(temp_chunk, sub_chunk)
compiler.emit(temp_chunk, "end", ast)
for i, v in ipairs(temp_chunk) do
table.insert(utils.root.chunk, i, v)
end
if fennel_3f then
emit_fennel(src, path, opts, sub_chunk)
else
compiler.emit(sub_chunk, src, ast)
end
utils.root.scope.includes[mod] = ret
return ret
end
local function include_circular_fallback(mod, modexpr, fallback, ast)
if (utils.root.scope.includes[mod] == "fnl/loading") then
compiler.assert(fallback, "circular include detected", ast)
return fallback(modexpr)
end
end
SPECIALS.include = function(ast, scope, parent, opts)
compiler.assert((#ast == 2), "expected one argument", ast)
local modexpr = compiler.compile1(ast[2], scope, parent, {nval = 1})[1]
if ((modexpr.type ~= "literal") or ((modexpr[1]):byte() ~= 34)) then
if opts.fallback then
return opts.fallback(modexpr)
else
return compiler.assert(false, "module name must be string literal", ast)
end
else
local mod = load_code(("return " .. modexpr[1]))()
local function _1_()
local _0_0 = search_module(mod)
if (nil ~= _0_0) then
local fennel_path = _0_0
return include_path(ast, opts, fennel_path, mod, true)
else
local _ = _0_0
local lua_path = search_module(mod, package.path)
if lua_path then
return include_path(ast, opts, lua_path, mod, false)
elseif opts.fallback then
return opts.fallback(modexpr)
else
return compiler.assert(false, ("module not found " .. mod), ast)
end
end
end
return (include_circular_fallback(mod, modexpr, opts.fallback, ast) or utils.root.scope.includes[mod] or _1_())
end
end
doc_special("include", {"module-name-literal"}, "Like require but load the target module during compilation and embed it in the\nLua output. The module must be a string literal and resolvable at compile time.")
local function eval_compiler_2a(ast, scope, parent)
local scope0 = compiler["make-scope"](compiler.scopes.compiler)
local luasrc = compiler.compile(ast, {scope = scope0, useMetadata = utils.root.options.useMetadata})
local loader = load_code(luasrc, wrap_env(make_compiler_env(ast, scope0, parent)))
return loader()
end
SPECIALS.macros = function(ast, scope, parent)
compiler.assert((#ast == 2), "Expected one table argument", ast)
return add_macros(eval_compiler_2a(ast[2], scope, parent), ast, scope, parent)
end
doc_special("macros", {"{:macro-name-1 (fn [...] ...) ... :macro-name-N macro-body-N}"}, "Define all functions in the given table as macros local to the current scope.")
SPECIALS["eval-compiler"] = function(ast, scope, parent)
local old_first = ast[1]
ast[1] = utils.sym("do")
local val = eval_compiler_2a(ast, scope, parent)
ast[1] = old_first
return val
end
doc_special("eval-compiler", {"..."}, "Evaluate the body at compile-time. Use the macro system instead if possible.")
return {["current-global-names"] = current_global_names, ["load-code"] = load_code, ["macro-loaded"] = macro_loaded, ["make-compiler-env"] = make_compiler_env, ["make-searcher"] = make_searcher, ["search-module"] = search_module, ["wrap-env"] = wrap_env, doc = doc_2a}
end
package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or function(...)
local utils = require("fennel.utils")
local parser = require("fennel.parser")
local friend = require("fennel.friend")
local unpack = (_G.unpack or table.unpack)
local scopes = {}
local function make_scope(parent)
local parent0 = (parent or scopes.global)
local _0_
if parent0 then
_0_ = ((parent0.depth or 0) + 1)
else
_0_ = 0
end
return {autogensyms = {}, depth = _0_, hashfn = (parent0 and parent0.hashfn), includes = setmetatable({}, {__index = (parent0 and parent0.includes)}), macros = setmetatable({}, {__index = (parent0 and parent0.macros)}), manglings = setmetatable({}, {__index = (parent0 and parent0.manglings)}), parent = parent0, refedglobals = setmetatable({}, {__index = (parent0 and parent0.refedglobals)}), specials = setmetatable({}, {__index = (parent0 and parent0.specials)}), symmeta = setmetatable({}, {__index = (parent0 and parent0.symmeta)}), unmanglings = setmetatable({}, {__index = (parent0 and parent0.unmanglings)}), vararg = (parent0 and parent0.vararg)}
end
local function assert_compile(condition, msg, ast)
if not condition then
local _0_ = (utils.root.options or {})
local source = _0_["source"]
local unfriendly = _0_["unfriendly"]
utils.root.reset()
if unfriendly then
local m = getmetatable(ast)
local filename = ((m and m.filename) or ast.filename or "unknown")
local line = ((m and m.line) or ast.line or "?")
local target = nil
local function _1_()
if utils["is-sym"](ast[1]) then
return utils.deref(ast[1])
else
return (ast[1] or "()")
end
end
target = tostring(_1_())
error(string.format("Compile error in '%s' %s:%s: %s", target, filename, line, msg), 0)
else
friend["assert-compile"](condition, msg, ast, source)
end
end
return condition
end
scopes.global = make_scope()
scopes.global.vararg = true
scopes.compiler = make_scope(scopes.global)
scopes.macro = scopes.global
local serialize_subst = {["\11"] = "\\v", ["\12"] = "\\f", ["\7"] = "\\a", ["\8"] = "\\b", ["\9"] = "\\t", ["\n"] = "n"}
local function serialize_string(str)
local function _0_(_241)
return ("\\" .. _241:byte())
end
return ("%q"):format(str):gsub(".", serialize_subst):gsub("[\128-\255]", _0_)
end
local function global_mangling(str)
if utils["is-valid-lua-identifier"](str) then
return str
else
local function _0_(_241)
return ("_%02x"):format(_241:byte())
end
return ("__fnl_global__" .. str:gsub("[^%w]", _0_))
end
end
local function global_unmangling(identifier)
local _0_0 = identifier:match("^__fnl_global__(.*)$")
if (nil ~= _0_0) then
local rest = _0_0
local _1_0 = nil
local function _2_(_241)
return string.char(tonumber(_241:sub(2), 16))
end
_1_0 = rest:gsub("_[%da-f][%da-f]", _2_)
return _1_0
else
local _ = _0_0
return identifier
end
end
local allowed_globals = nil
local function global_allowed(name)
local found_3f = not allowed_globals
if not allowed_globals then
return true
else
for _, g in ipairs(allowed_globals) do
if (g == name) then
found_3f = true
end
end
return found_3f
end
end
local function local_mangling(str, scope, ast, temp_manglings)
local append = 0
local mangling = str
assert_compile(not utils["is-multi-sym"](str), ("unexpected multi symbol " .. str), ast)
if (utils["lua-keywords"][mangling] or mangling:match("^%d")) then
mangling = ("_" .. mangling)
end
local function _1_(_241)
return ("_%02x"):format(_241:byte())
end
mangling = mangling:gsub("-", "_"):gsub("[^%w_]", _1_)
local raw = mangling
while scope.unmanglings[mangling] do
mangling = (raw .. append)
append = (append + 1)
end
scope.unmanglings[mangling] = str
do
local manglings = (temp_manglings or scope.manglings)
manglings[str] = mangling
end
return mangling
end
local function apply_manglings(scope, new_manglings, ast)
for raw, mangled in pairs(new_manglings) do
assert_compile(not scope.refedglobals[mangled], ("use of global " .. raw .. " is aliased by a local"), ast)
scope.manglings[raw] = mangled
end
return nil
end
local function combine_parts(parts, scope)
local ret = (scope.manglings[parts[1]] or global_mangling(parts[1]))
for i = 2, #parts, 1 do
if utils["is-valid-lua-identifier"](parts[i]) then
if (parts["multi-sym-method-call"] and (i == #parts)) then
ret = (ret .. ":" .. parts[i])
else
ret = (ret .. "." .. parts[i])
end
else
ret = (ret .. "[" .. serialize_string(parts[i]) .. "]")
end
end
return ret
end
local function gensym(scope, base)
local append, mangling = 0, ((base or "") .. "_0_")
while scope.unmanglings[mangling] do
mangling = ((base or "") .. "_" .. append .. "_")
append = (append + 1)
end
scope.unmanglings[mangling] = true
return mangling
end
local function autogensym(base, scope)
local _0_0 = utils["is-multi-sym"](base)
if (nil ~= _0_0) then
local parts = _0_0
parts[1] = autogensym(parts[1], scope)
return table.concat(parts, ((parts["multi-sym-method-call"] and ":") or "."))
else
local _ = _0_0
local function _1_()
local mangling = gensym(scope, base:sub(1, ( - 2)))
scope.autogensyms[base] = mangling
return mangling
end
return (scope.autogensyms[base] or _1_())
end
end
local function check_binding_valid(symbol, scope, ast)
local name = utils.deref(symbol)
assert_compile(not (scope.specials[name] or scope.macros[name]), ("local %s was overshadowed by a special form or macro"):format(name), ast)
return assert_compile(not utils["is-quoted"](symbol), ("macro tried to bind %s without gensym"):format(name), symbol)
end
local function declare_local(symbol, meta, scope, ast, temp_manglings)
check_binding_valid(symbol, scope, ast)
local name = utils.deref(symbol)
assert_compile(not utils["is-multi-sym"](name), ("unexpected multi symbol " .. name), ast)
scope.symmeta[name] = meta
return local_mangling(name, scope, ast, temp_manglings)
end
local function symbol_to_expression(symbol, scope, is_reference)
local name = symbol[1]
local multi_sym_parts = utils["is-multi-sym"](name)
if scope.hashfn then
if (name == "$") then
name = "$1"
end
if multi_sym_parts then
if (multi_sym_parts[1] == "$") then
multi_sym_parts[1] = "$1"
name = table.concat(multi_sym_parts, ".")
end
end
end
local parts = (multi_sym_parts or {name})
local etype = (((#parts > 1) and "expression") or "sym")
local is_local = scope.manglings[parts[1]]
if (is_local and scope.symmeta[parts[1]]) then
scope.symmeta[parts[1]]["used"] = true
end
assert_compile((not is_reference or is_local or global_allowed(parts[1])), ("unknown global in strict mode: " .. parts[1]), symbol)
if (allowed_globals and not is_local) then
utils.root.scope.refedglobals[parts[1]] = true
end
return utils.expr(combine_parts(parts, scope), etype)
end
local function emit(chunk, out, ast)
if (type(out) == "table") then
return table.insert(chunk, out)
else
return table.insert(chunk, {ast = ast, leaf = out})
end
end
local function peephole(chunk)
if chunk.leaf then
return chunk
elseif ((#chunk >= 3) and (chunk[(#chunk - 2)].leaf == "do") and not chunk[(#chunk - 1)].leaf and (chunk[#chunk].leaf == "end")) then
local kid = peephole(chunk[(#chunk - 1)])
local new_chunk = {ast = chunk.ast}
for i = 1, (#chunk - 3), 1 do
table.insert(new_chunk, peephole(chunk[i]))
end
for i = 1, #kid, 1 do
table.insert(new_chunk, kid[i])
end
return new_chunk
else
return utils.map(chunk, peephole)
end
end
local function flatten_chunk_correlated(main_chunk)
local function flatten(chunk, out, last_line, file)
local last_line0 = last_line
if chunk.leaf then
out[last_line0] = ((out[last_line0] or "") .. " " .. chunk.leaf)
else
for _, subchunk in ipairs(chunk) do
if (subchunk.leaf or (#subchunk > 0)) then
if (subchunk.ast and (file == subchunk.ast.file)) then
last_line0 = math.max(last_line0, (subchunk.ast.line or 0))
end
last_line0 = flatten(subchunk, out, last_line0, file)
end
end
end
return last_line0
end
local out = {}
local last = flatten(main_chunk, out, 1, main_chunk.file)
for i = 1, last do
if (out[i] == nil) then
out[i] = ""
end
end
return table.concat(out, "\n")
end
local function flatten_chunk(sm, chunk, tab, depth)
if chunk.leaf then
local code = chunk.leaf
local info = chunk.ast
if sm then
sm[(#sm + 1)] = ((info and info.line) or ( - 1))
end
return code
else
local tab0 = nil
do
local _0_0 = tab
if (_0_0 == true) then
tab0 = " "
elseif (_0_0 == false) then
tab0 = ""
elseif (_0_0 == tab) then
tab0 = tab
elseif (_0_0 == nil) then
tab0 = ""
else
tab0 = nil
end
end
local function parter(c)
if (c.leaf or (#c > 0)) then
local sub = flatten_chunk(sm, c, tab0, (depth + 1))
if (depth > 0) then
sub = (tab0 .. sub:gsub("\n", ("\n" .. tab0)))
end
return sub
end
end
return table.concat(utils.map(chunk, parter), "\n")
end
end
local fennel_sourcemap = {}
local function make_short_src(source)
local source0 = source:gsub("\n", " ")
if (#source0 <= 49) then
return ("[fennel \"" .. source0 .. "\"]")
else
return ("[fennel \"" .. source0:sub(1, 46) .. "...\"]")
end
end
local function flatten(chunk, options)
local chunk0 = peephole(chunk)
if options.correlate then
return flatten_chunk_correlated(chunk0), {}
else
local sm = {}
local ret = flatten_chunk(sm, chunk0, options.indent, 0)
if sm then
local key, short_src = nil
if options.filename then
short_src = options.filename
key = ("@" .. short_src)
else
key = ret
short_src = make_short_src((options.source or ret))
end
sm.short_src = short_src
sm.key = key
fennel_sourcemap[key] = sm
end
return ret, sm
end
end
local function make_metadata()
local function _0_(self, tgt, key)
if self[tgt] then
return self[tgt][key]
end
end
local function _1_(self, tgt, key, value)
self[tgt] = (self[tgt] or {})
self[tgt][key] = value
return tgt
end
local function _2_(self, tgt, ...)
local kv_len = select("#", ...)
local kvs = {...}
if ((kv_len % 2) ~= 0) then
error("metadata:setall() expected even number of k/v pairs")
end
self[tgt] = (self[tgt] or {})
for i = 1, kv_len, 2 do
self[tgt][kvs[i]] = kvs[(i + 1)]
end
return tgt
end
return setmetatable({}, {__index = {get = _0_, set = _1_, setall = _2_}, __mode = "k"})
end
local function exprs1(exprs)
return table.concat(utils.map(exprs, 1), ", ")
end
local function keep_side_effects(exprs, chunk, start, ast)
local start0 = (start or 1)
for j = start0, #exprs, 1 do
local se = exprs[j]
if ((se.type == "expression") and (se[1] ~= "nil")) then
emit(chunk, ("do local _ = %s end"):format(tostring(se)), ast)
elseif (se.type == "statement") then
local code = tostring(se)
emit(chunk, (((code:byte() == 40) and ("do end " .. code)) or code), ast)
end
end
return nil
end
local function handle_compile_opts(exprs, parent, opts, ast)
if opts.nval then
local n = opts.nval
local len = #exprs
if (n ~= len) then
if (len > n) then
keep_side_effects(exprs, parent, (n + 1), ast)
for i = (n + 1), len, 1 do
exprs[i] = nil
end
else
for i = (#exprs + 1), n, 1 do
exprs[i] = utils.expr("nil", "literal")
end
end
end
end
if opts.tail then
emit(parent, ("return %s"):format(exprs1(exprs)), ast)
end
if opts.target then
local result = exprs1(exprs)
if (result == "") then
result = "nil"
end
emit(parent, ("%s = %s"):format(opts.target, result), ast)
end
if (opts.tail or opts.target) then
return {}
else
return exprs
end
end
local function macroexpand_2a(ast, scope, once)
if not utils["is-list"](ast) then
return ast
else
local multi_sym_parts = utils["is-multi-sym"](ast[1])
local macro_2a = (utils["is-sym"](ast[1]) and scope.macros[utils.deref(ast[1])])
if (not macro_2a and multi_sym_parts) then
local in_macro_module = nil
macro_2a = scope.macros
for i = 1, #multi_sym_parts, 1 do
macro_2a = (utils["is-table"](macro_2a) and macro_2a[multi_sym_parts[i]])
if macro_2a then
in_macro_module = true
end
end
assert_compile((not in_macro_module or (type(macro_2a) == "function")), "macro not found in imported macro module", ast)
end
if not macro_2a then
return ast
else
local old_scope = scopes.macro
local _ = nil
scopes.macro = scope
_ = nil
local ok, transformed = pcall(macro_2a, unpack(ast, 2))
scopes.macro = old_scope
assert_compile(ok, transformed, ast)
if (once or not transformed) then
return transformed
else
return macroexpand_2a(transformed, scope)
end
end
end
end
local function compile1(ast, scope, parent, opts)
local opts0 = (opts or {})
local ast0 = macroexpand_2a(ast, scope)
local exprs = {}
if utils["is-list"](ast0) then
local len = #ast0
local first = ast0[1]
local multi_sym_parts = utils["is-multi-sym"](first)
local special = (utils["is-sym"](first) and scope.specials[utils.deref(first)])
assert_compile((#ast0 > 0), "expected a function, macro, or special to call", ast0)
if special then
exprs = (special(ast0, scope, parent, opts0) or utils.expr("nil", "literal"))
if (type(exprs) == "string") then
exprs = utils.expr(exprs, "expression")
end
if utils["is-expr"](exprs) then
exprs = {exprs}
end
if not exprs.returned then
exprs = handle_compile_opts(exprs, parent, opts0, ast0)
elseif (opts0.tail or opts0.target) then
exprs = {}
end
elseif (multi_sym_parts and multi_sym_parts["multi-sym-method-call"]) then
local table_with_method = table.concat({unpack(multi_sym_parts, 1, (#multi_sym_parts - 1))}, ".")
local method_to_call = multi_sym_parts[#multi_sym_parts]
local new_ast = utils.list(utils.sym(":", scope), utils.sym(table_with_method, scope), method_to_call)
for i = 2, len, 1 do
new_ast[(#new_ast + 1)] = ast0[i]
end
exprs = compile1(new_ast, scope, parent, opts0)
else
local fargs = {}
local fcallee = compile1(ast0[1], scope, parent, {nval = 1})[1]
assert_compile((fcallee.type ~= "literal"), ("cannot call literal value " .. tostring(ast0[1])), ast0)
fcallee = tostring(fcallee)
for i = 2, len, 1 do
local subexprs = compile1(ast0[i], scope, parent, {nval = (((i ~= len) and 1) or nil)})
fargs[(#fargs + 1)] = (subexprs[1] or utils.expr("nil", "literal"))
if (i == len) then
for j = 2, #subexprs, 1 do
fargs[(#fargs + 1)] = subexprs[j]
end
else
keep_side_effects(subexprs, parent, 2, ast0[i])
end
end
local call = ("%s(%s)"):format(tostring(fcallee), exprs1(fargs))
exprs = handle_compile_opts({utils.expr(call, "statement")}, parent, opts0, ast0)
end
elseif utils["is-varg"](ast0) then
assert_compile(scope.vararg, "unexpected vararg", ast0)
exprs = handle_compile_opts({utils.expr("...", "varg")}, parent, opts0, ast0)
elseif utils["is-sym"](ast0) then
local multi_sym_parts = utils["is-multi-sym"](ast0)
local e = nil
assert_compile(not (multi_sym_parts and multi_sym_parts["multi-sym-method-call"]), "multisym method calls may only be in call position", ast0)
if (ast0[1] == "nil") then
e = utils.expr("nil", "literal")
else
e = symbol_to_expression(ast0, scope, true)
end
exprs = handle_compile_opts({e}, parent, opts0, ast0)
elseif ((type(ast0) == "nil") or (type(ast0) == "boolean")) then
exprs = handle_compile_opts({utils.expr(tostring(ast0), "literal")}, parent, opts0)
elseif (type(ast0) == "number") then
local n = ("%.17g"):format(ast0)
exprs = handle_compile_opts({utils.expr(n, "literal")}, parent, opts0)
elseif (type(ast0) == "string") then
local s = serialize_string(ast0)
exprs = handle_compile_opts({utils.expr(s, "literal")}, parent, opts0)
elseif (type(ast0) == "table") then
local buffer = {}
for i = 1, #ast0, 1 do
local nval = ((i ~= #ast0) and 1)
buffer[(#buffer + 1)] = exprs1(compile1(ast0[i], scope, parent, {nval = nval}))
end
local function write_other_values(k)
if ((type(k) ~= "number") or (math.floor(k) ~= k) or (k < 1) or (k > #ast0)) then
if ((type(k) == "string") and utils["is-valid-lua-identifier"](k)) then
return {k, k}
else
local _0_ = compile1(k, scope, parent, {nval = 1})
local compiled = _0_[1]
local kstr = ("[" .. tostring(compiled) .. "]")
return {kstr, k}
end
end
end
do
local keys = nil
do
local _0_0 = utils.kvmap(ast0, write_other_values)
local function _1_(a, b)
return (a[1] < b[1])
end
table.sort(_0_0, _1_)
keys = _0_0
end
local function _1_(k)
local v = tostring(compile1(ast0[k[2]], scope, parent, {nval = 1})[1])
return ("%s = %s"):format(k[1], v)
end
utils.map(keys, _1_, buffer)
end
exprs = handle_compile_opts({utils.expr(("{" .. table.concat(buffer, ", ") .. "}"), "expression")}, parent, opts0, ast0)
else
assert_compile(false, ("could not compile value of type " .. type(ast0)), ast0)
end
exprs.returned = true
return exprs
end
local function destructure(to, from, ast, scope, parent, opts)
local opts0 = (opts or {})
local _0_ = opts0
local declaration = _0_["declaration"]
local forceglobal = _0_["forceglobal"]
local forceset = _0_["forceset"]
local isvar = _0_["isvar"]
local nomulti = _0_["nomulti"]
local noundef = _0_["noundef"]
local setter = nil
if declaration then
setter = "local %s = %s"
else
setter = "%s = %s"
end
local new_manglings = {}
local function getname(symbol, up1)
local raw = symbol[1]
assert_compile(not (nomulti and utils["is-multi-sym"](raw)), ("unexpected multi symbol " .. raw), up1)
if declaration then
return declare_local(symbol, {var = isvar}, scope, symbol, new_manglings)
else
local parts = (utils["is-multi-sym"](raw) or {raw})
local meta = scope.symmeta[parts[1]]
if ((#parts == 1) and not forceset) then
assert_compile(not (forceglobal and meta), ("global %s conflicts with local"):format(tostring(symbol)), symbol)
assert_compile(not (meta and not meta.var), ("expected var " .. raw), symbol)
assert_compile((meta or not noundef), ("expected local " .. parts[1]), symbol)
end
if forceglobal then
assert_compile(not scope.symmeta[scope.unmanglings[raw]], ("global " .. raw .. " conflicts with local"), symbol)
scope.manglings[raw] = global_mangling(raw)
scope.unmanglings[global_mangling(raw)] = raw
if allowed_globals then
table.insert(allowed_globals, raw)
end
end
return symbol_to_expression(symbol, scope)[1]
end
end
local function compile_top_target(lvalues)
local inits = nil
local function _2_(_241)
if scope.manglings[_241] then
return _241
else
return "nil"
end
end
inits = utils.map(lvalues, _2_)
local init = table.concat(inits, ", ")
local lvalue = table.concat(lvalues, ", ")
local plen, plast = #parent, parent[#parent]
local ret = compile1(from, scope, parent, {target = lvalue})
if declaration then
for pi = plen, #parent do
if (parent[pi] == plast) then
plen = pi
end
end
if ((#parent == (plen + 1)) and parent[#parent].leaf) then
parent[#parent]["leaf"] = ("local " .. parent[#parent].leaf)
else
table.insert(parent, (plen + 1), {ast = ast, leaf = ("local " .. lvalue .. " = " .. init)})
end
end
return ret
end
local function destructure1(left, rightexprs, up1, top)
if (utils["is-sym"](left) and (left[1] ~= "nil")) then
local lname = getname(left, up1)
check_binding_valid(left, scope, left)
if top then
compile_top_target({lname})
else
emit(parent, setter:format(lname, exprs1(rightexprs)), left)
end
elseif utils["is-table"](left) then
local s = gensym(scope)
local right = nil
if top then
right = exprs1(compile1(from, scope, parent))
else
right = exprs1(rightexprs)
end
if (right == "") then
right = "nil"
end
emit(parent, ("local %s = %s"):format(s, right), left)
for k, v in utils.stablepairs(left) do
if (utils["is-sym"](left[k]) and (left[k][1] == "&")) then
assert_compile(((type(k) == "number") and not left[(k + 2)]), "expected rest argument before last parameter", left)
local formatted = ("{(table.unpack or unpack)(%s, %s)}"):format(s, k)
local subexpr = utils.expr(formatted, "expression")
destructure1(left[(k + 1)], {subexpr}, left)
return
else
if (utils["is-sym"](k) and (tostring(k) == ":") and utils["is-sym"](v)) then
k = tostring(v)
end
if (type(k) ~= "number") then
k = serialize_string(k)
end
local subexpr = utils.expr(("%s[%s]"):format(s, k), "expression")
destructure1(v, {subexpr}, left)
end
end
elseif utils["is-list"](left) then
local left_names, tables = {}, {}
for i, name in ipairs(left) do
local symname = nil
if utils["is-sym"](name) then
symname = getname(name, up1)
else
symname = gensym(scope)
tables[i] = {name, utils.expr(symname, "sym")}
end
table.insert(left_names, symname)
end
if top then
compile_top_target(left_names)
else
local lvalue = table.concat(left_names, ", ")
local setting = setter:format(lvalue, exprs1(rightexprs))
emit(parent, setting, left)
end
for _, pair in utils.stablepairs(tables) do
destructure1(pair[1], {pair[2]}, left)
end
else
assert_compile(false, ("unable to bind %s %s"):format(type(left), tostring(left)), (((type(up1[2]) == "table") and up1[2]) or up1))
end
if top then
return {returned = true}
end
end
local ret = destructure1(to, nil, ast, true)
apply_manglings(scope, new_manglings, ast)
return ret
end
local function require_include(ast, scope, parent, opts)
opts.fallback = function(e)
return utils.expr(("require(%s)"):format(tostring(e)), "statement")
end
return scopes.global.specials.include(ast, scope, parent, opts)
end
local function compile_stream(strm, options)
local opts = utils.copy(options)
local old_globals = allowed_globals
local scope = (opts.scope or make_scope(scopes.global))
local vals = {}
local chunk = {}
local _0_ = utils.root
_0_["set-reset"](_0_)
allowed_globals = opts.allowedGlobals
if (opts.indent == nil) then
opts.indent = " "
end
if opts.requireAsInclude then
scope.specials.require = require_include
end
utils.root.chunk, utils.root.scope, utils.root.options = chunk, scope, opts
for ok, val in parser.parser(strm, opts.filename, opts) do
vals[(#vals + 1)] = val
end
for i = 1, #vals, 1 do
local exprs = compile1(vals[i], scope, chunk, {nval = (((i < #vals) and 0) or nil), tail = (i == #vals)})
keep_side_effects(exprs, chunk, nil, vals[i])
end
allowed_globals = old_globals
utils.root.reset()
return flatten(chunk, opts)
end
local function compile_string(str, opts)
return compile_stream(parser["string-stream"](str), (opts or {}))
end
local function compile(ast, opts)
local opts0 = utils.copy(opts)
local old_globals = allowed_globals
local chunk = {}
local scope = (opts0.scope or make_scope(scopes.global))
local _0_ = utils.root
_0_["set-reset"](_0_)
allowed_globals = opts0.allowedGlobals
if (opts0.indent == nil) then
opts0.indent = " "
end
if opts0.requireAsInclude then
scope.specials.require = require_include
end
utils.root.chunk, utils.root.scope, utils.root.options = chunk, scope, opts0
local exprs = compile1(ast, scope, chunk, {tail = true})
keep_side_effects(exprs, chunk, nil, ast)
allowed_globals = old_globals
utils.root.reset()
return flatten(chunk, opts0)
end
local function traceback_frame(info)
if ((info.what == "C") and info.name) then
return (" [C]: in function '%s'"):format(info.name)
elseif (info.what == "C") then
return " [C]: in ?"
else
local remap = fennel_sourcemap[info.source]
if (remap and remap[info.currentline]) then
info["short-src"] = remap["short-src"]
info.currentline = remap[info.currentline]
end
if (info.what == "Lua") then
local function _1_()
if info.name then
return ("'" .. info.name .. "'")
else
return "?"
end
end
return string.format(" %s:%d: in function %s", info.short_src, info.currentline, _1_())
elseif (info["short-src"] == "(tail call)") then
return " (tail call)"
else
return string.format(" %s:%d: in main chunk", info.short_src, info.currentline)
end
end
end
local function traceback(msg, start)
local msg0 = (msg or "")
if ((msg0:find("^Compile error") or msg0:find("^Parse error")) and not utils["debug-on"]("trace")) then
return msg0
else
local lines = {}
if (msg0:find("^Compile error") or msg0:find("^Parse error")) then
table.insert(lines, msg0)
else
local newmsg = msg0:gsub("^[^:]*:%d+:%s+", "runtime error: ")
table.insert(lines, newmsg)
end
table.insert(lines, "stack traceback:")
local done_3f, level = false, (start or 2)
while not done_3f do
do
local _1_0 = debug.getinfo(level, "Sln")
if (_1_0 == nil) then
done_3f = true
elseif (nil ~= _1_0) then
local info = _1_0
table.insert(lines, traceback_frame(info))
end
end
level = (level + 1)
end
return table.concat(lines, "\n")
end
end
local function entry_transform(fk, fv)
local function _0_(k, v)
if (type(k) == "number") then
return k, fv(v)
else
return fk(k), fv(v)
end
end
return _0_
end
local function no()
return nil
end
local function mixed_concat(t, joiner)
local seen = {}
local ret, s = "", ""
for k, v in ipairs(t) do
table.insert(seen, k)
ret = (ret .. s .. v)
s = joiner
end
for k, v in utils.stablepairs(t) do
if not seen[k] then
ret = (ret .. s .. "[" .. k .. "]" .. "=" .. v)
s = joiner
end
end
return ret
end
local function do_quote(form, scope, parent, runtime)
local function q(x)
return do_quote(x, scope, parent, runtime)
end
if utils["is-varg"](form) then
assert_compile(not runtime, "quoted ... may only be used at compile time", form)
return "_VARARG"
elseif utils["is-sym"](form) then
local filename = nil
if form.filename then
filename = ("%q"):format(form.filename)
else
filename = "nil"
end
local symstr = utils.deref(form)
assert_compile(not runtime, "symbols may only be used at compile time", form)
if (symstr:find("#$") or symstr:find("#[:.]")) then
return ("sym('%s', nil, {filename=%s, line=%s})"):format(autogensym(symstr, scope), filename, (form.line or "nil"))
else
return ("sym('%s', nil, {quoted=true, filename=%s, line=%s})"):format(symstr, filename, (form.line or "nil"))
end
elseif (utils["is-list"](form) and utils["is-sym"](form[1]) and (utils.deref(form[1]) == "unquote")) then
local payload = form[2]
local res = unpack(compile1(payload, scope, parent))
return res[1]
elseif utils["is-list"](form) then
local mapped = utils.kvmap(form, entry_transform(no, q))
local filename = nil
if form.filename then
filename = ("%q"):format(form.filename)
else
filename = "nil"
end
assert_compile(not runtime, "lists may only be used at compile time", form)
return (("setmetatable({filename=%s, line=%s, bytestart=%s, %s}" .. ", getmetatable(list()))")):format(filename, (form.line or "nil"), (form.bytestart or "nil"), mixed_concat(mapped, ", "))
elseif (type(form) == "table") then
local mapped = utils.kvmap(form, entry_transform(q, q))
local source = getmetatable(form)
local filename = nil
if source.filename then
filename = ("%q"):format(source.filename)
else
filename = "nil"
end
local function _1_()
if source then
return source.line
else
return "nil"
end
end
return ("setmetatable({%s}, {filename=%s, line=%s})"):format(mixed_concat(mapped, ", "), filename, _1_())
elseif (type(form) == "string") then
return serialize_string(form)
else
return tostring(form)
end
end
return {["apply-manglings"] = apply_manglings, ["compile-stream"] = compile_stream, ["compile-string"] = compile_string, ["declare-local"] = declare_local, ["do-quote"] = do_quote, ["global-mangling"] = global_mangling, ["global-unmangling"] = global_unmangling, ["keep-side-effects"] = keep_side_effects, ["make-scope"] = make_scope, ["require-include"] = require_include, ["symbol-to-expression"] = symbol_to_expression, assert = assert_compile, autogensym = autogensym, compile = compile, compile1 = compile1, destructure = destructure, emit = emit, gensym = gensym, macroexpand = macroexpand_2a, metadata = make_metadata(), scopes = scopes, traceback = traceback}
end
package.preload["fennel.friend"] = package.preload["fennel.friend"] or function(...)
local function ast_source(ast)
local m = getmetatable(ast)
if (m and m.line and m) then
return m
else
return ast
end
end
local suggestions = {["$ and $... in hashfn are mutually exclusive"] = {"modifying the hashfn so it only contains $... or $, $1, $2, $3, etc"}, ["can't start multisym segment with a digit"] = {"removing the digit", "adding a non-digit before the digit"}, ["cannot call literal value"] = {"checking for typos", "checking for a missing function name"}, ["could not compile value of type "] = {"debugging the macro you're calling not to return a coroutine or userdata"}, ["could not read number (.*)"] = {"removing the non-digit character", "beginning the identifier with a non-digit if it is not meant to be a number"}, ["expected a function.* to call"] = {"removing the empty parentheses", "using square brackets if you want an empty table"}, ["expected binding table"] = {"placing a table here in square brackets containing identifiers to bind"}, ["expected body expression"] = {"putting some code in the body of this form after the bindings"}, ["expected each macro to be function"] = {"ensuring that the value for each key in your macros table contains a function", "avoid defining nested macro tables"}, ["expected even number of name/value bindings"] = {"finding where the identifier or value is missing"}, ["expected even number of values in table literal"] = {"removing a key", "adding a value"}, ["expected local"] = {"looking for a typo", "looking for a local which is used out of its scope"}, ["expected macros to be table"] = {"ensuring your macro definitions return a table"}, ["expected parameters"] = {"adding function parameters as a list of identifiers in brackets"}, ["expected rest argument before last parameter"] = {"moving & to right before the final identifier when destructuring"}, ["expected symbol for function parameter: (.*)"] = {"changing %s to an identifier instead of a literal value"}, ["expected var (.*)"] = {"declaring %s using var instead of let/local", "introducing a new local instead of changing the value of %s"}, ["expected vararg as last parameter"] = {"moving the \"...\" to the end of the parameter list"}, ["expected whitespace before opening delimiter"] = {"adding whitespace"}, ["global (.*) conflicts with local"] = {"renaming local %s"}, ["illegal character: (.)"] = {"deleting or replacing %s", "avoiding reserved characters like \", \\, ', ~, ;, @, `, and comma"}, ["local (.*) was overshadowed by a special form or macro"] = {"renaming local %s"}, ["macro not found in macro module"] = {"checking the keys of the imported macro module's returned table"}, ["macro tried to bind (.*) without gensym"] = {"changing to %s# when introducing identifiers inside macros"}, ["malformed multisym"] = {"ensuring each period or colon is not followed by another period or colon"}, ["may only be used at compile time"] = {"moving this to inside a macro if you need to manipulate symbols/lists", "using square brackets instead of parens to construct a table"}, ["method must be last component"] = {"using a period instead of a colon for field access", "removing segments after the colon", "making the method call, then looking up the field on the result"}, ["mismatched closing delimiter (.), expected (.)"] = {"replacing %s with %s", "deleting %s", "adding matching opening delimiter earlier"}, ["multisym method calls may only be in call position"] = {"using a period instead of a colon to reference a table's fields", "putting parens around this"}, ["unable to bind (.*)"] = {"replacing the %s with an identifier"}, ["unexpected closing delimiter (.)"] = {"deleting %s", "adding matching opening delimiter earlier"}, ["unexpected multi symbol (.*)"] = {"removing periods or colons from %s"}, ["unexpected vararg"] = {"putting \"...\" at the end of the fn parameters if the vararg was intended"}, ["unknown global in strict mode: (.*)"] = {"looking to see if there's a typo", "using the _G table instead, eg. _G.%s if you really want a global", "moving this code to somewhere that %s is in scope", "binding %s as a local in the scope of this code"}, ["unused local (.*)"] = {"fixing a typo so %s is used", "renaming the local to _%s"}, ["use of global (.*) is aliased by a local"] = {"renaming local %s", "refer to the global using _G.%s instead of directly"}}
local unpack = (_G.unpack or table.unpack)
local function suggest(msg)
local suggestion = nil
for pat, sug in pairs(suggestions) do
local matches = {msg:match(pat)}
if (0 < #matches) then
if ("table" == type(sug)) then
local out = {}
for _, s in ipairs(sug) do
table.insert(out, s:format(unpack(matches)))
end
suggestion = out
else
suggestion = sug(matches)
end
end
end
return suggestion
end
local function read_line_from_file(filename, line)
local bytes = 0
local f = assert(io.open(filename))
local _ = nil
for _0 = 1, (line - 1) do
bytes = (bytes + 1 + #f:read())
end
_ = nil
local codeline = f:read()
f:close()
return codeline, bytes
end
local function read_line_from_source(source, line)
local lines, bytes, codeline = 0, 0
for this_line, newline in string.gmatch((source .. "\n"), "(.-)(\13?\n)") do
lines = (lines + 1)
if (lines == line) then
codeline = this_line
break
end
bytes = (bytes + #newline + #this_line)
end
return codeline, bytes
end
local function read_line(filename, line, source)
if source then
return read_line_from_source(source, line)
else
return read_line_from_file(filename, line)
end
end
local function friendly_msg(msg, _0_0, source)
local _1_ = _0_0
local byteend = _1_["byteend"]
local bytestart = _1_["bytestart"]
local filename = _1_["filename"]
local line = _1_["line"]
local ok, codeline, bol, eol = pcall(read_line, filename, line, source)
local suggestions0 = suggest(msg)
local out = {msg, ""}
if (ok and codeline) then
table.insert(out, codeline)
end
if (ok and codeline and bytestart and byteend) then
table.insert(out, (string.rep(" ", (bytestart - bol - 1)) .. "^" .. string.rep("^", math.min((byteend - bytestart), ((bol + #codeline) - bytestart)))))
end
if (ok and codeline and bytestart and not byteend) then
table.insert(out, (string.rep("-", (bytestart - bol - 1)) .. "^"))
table.insert(out, "")
end
if suggestions0 then
for _, suggestion in ipairs(suggestions0) do
table.insert(out, ("* Try %s."):format(suggestion))
end
end
return table.concat(out, "\n")
end
local function assert_compile(condition, msg, ast, source)
if not condition then
local _1_ = ast_source(ast)
local filename = _1_["filename"]
local line = _1_["line"]
error(friendly_msg(("Compile error in %s:%s\n %s"):format((filename or "unknown"), (line or "?"), msg), ast_source(ast), source), 0)
end
return condition
end
local function parse_error(msg, filename, line, bytestart, source)
return error(friendly_msg(("Parse error in %s:%s\n %s"):format(filename, line, msg), {bytestart = bytestart, filename = filename, line = line}, source), 0)
end
return {["assert-compile"] = assert_compile, ["parse-error"] = parse_error}
end
package.preload["fennel.parser"] = package.preload["fennel.parser"] or function(...)
local utils = require("fennel.utils")
local friend = require("fennel.friend")
local unpack = (_G.unpack or table.unpack)
local function granulate(getchunk)
local c = ""
local index = 1
local done = false
local function _0_(parser_state)
if not done then
if (index <= #c) then
local b = c:byte(index)
index = (index + 1)
return b
else
c = getchunk(parser_state)
if (not c or (c == "")) then
done = true
return nil
end
index = 2
return c:byte(1)
end
end
end
local function _1_()
c = ""
return nil
end
return _0_, _1_
end
local function string_stream(str)
local str0 = str:gsub("^#![^\n]*\n", "")
local index = 1
local function _0_()
local r = str0:byte(index)
index = (index + 1)
return r
end
return _0_
end
local delims = {[123] = 125, [125] = true, [40] = 41, [41] = true, [91] = 93, [93] = true}
local function iswhitespace(b)
return ((b == 32) or ((b >= 9) and (b <= 13)))
end
local function issymbolchar(b)
return ((b > 32) and not delims[b] and (b ~= 127) and (b ~= 34) and (b ~= 39) and (b ~= 126) and (b ~= 59) and (b ~= 44) and (b ~= 64) and (b ~= 96))
end
local prefixes = {[35] = "hashfn", [39] = "quote", [44] = "unquote", [96] = "quote"}
local function parser(getbyte, filename, options)
local stack = {}
local line = 1
local byteindex = 0
local lastb = nil
local function ungetb(ub)
if (ub == 10) then
line = (line - 1)
end
byteindex = (byteindex - 1)
lastb = ub
return nil
end
local function getb()
local r = nil
if lastb then
r, lastb = lastb, nil
else
r = getbyte({["stack-size"] = #stack})
end
byteindex = (byteindex + 1)
if (r == 10) then
line = (line + 1)
end
return r
end
local function parse_error(msg)
local _0_ = (utils.root.options or {})
local source = _0_["source"]
local unfriendly = _0_["unfriendly"]
utils.root.reset()
if unfriendly then
return error(("Parse error in %s:%s: %s"):format((filename or "unknown"), (line or "?"), msg), 0)
else
return friend["parse-error"](msg, (filename or "unknown"), (line or "?"), byteindex, source)
end
end
local function parse_stream()
local whitespace_since_dispatch, done, retval = true
local function dispatch(v)
if (#stack == 0) then
retval = v
done = true
whitespace_since_dispatch = false
return nil
elseif stack[#stack].prefix then
local stacktop = stack[#stack]
stack[#stack] = nil
return dispatch(utils.list(utils.sym(stacktop.prefix), v))
else
whitespace_since_dispatch = false
return table.insert(stack[#stack], v)
end
end
local function badend()
local accum = utils.map(stack, "closer")
return parse_error(("expected closing delimiter%s %s"):format((((#stack == 1) and "") or "s"), string.char(unpack(accum))))
end
while true do
local b = nil
while true do
b = getb()
if (b and iswhitespace(b)) then
whitespace_since_dispatch = true
end
if (not b or not iswhitespace(b)) then
break
end
end
if not b then
if (#stack > 0) then
badend()
end
return nil
end
if (b == 59) then
while true do
b = getb()
if (not b or (b == 10)) then
break
end
end
elseif (type(delims[b]) == "number") then
if not whitespace_since_dispatch then
parse_error(("expected whitespace before opening delimiter " .. string.char(b)))
end
table.insert(stack, setmetatable({bytestart = byteindex, closer = delims[b], filename = filename, line = line}, getmetatable(utils.list())))
elseif delims[b] then
if (#stack == 0) then
parse_error(("unexpected closing delimiter " .. string.char(b)))
end
local last = stack[#stack]
local val = nil
if (last.closer ~= b) then
parse_error(("mismatched closing delimiter " .. string.char(b) .. ", expected " .. string.char(last.closer)))
end
last.byteend = byteindex
if (b == 41) then
val = last
elseif (b == 93) then
val = utils.sequence(unpack(last))
for k, v in pairs(last) do
getmetatable(val)[k] = v
end
else
if ((#last % 2) ~= 0) then
byteindex = (byteindex - 1)
parse_error("expected even number of values in table literal")
end
val = {}
setmetatable(val, last)
for i = 1, #last, 2 do
if ((tostring(last[i]) == ":") and utils["is-sym"](last[(i + 1)]) and utils["is-sym"](last[i])) then
last[i] = tostring(last[(i + 1)])
end
val[last[i]] = last[(i + 1)]
end
end
stack[#stack] = nil
dispatch(val)
elseif (b == 34) then
local state = "base"
local chars = {34}
stack[(#stack + 1)] = {closer = 34}
while true do
b = getb()
chars[(#chars + 1)] = b
if (state == "base") then
if (b == 92) then
state = "backslash"
elseif (b == 34) then
state = "done"
end
else
state = "base"
end
if (not b or (state == "done")) then
break
end
end
if not b then
badend()
end
stack[#stack] = nil
local raw = string.char(unpack(chars))
local formatted = nil
local function _2_(c)
return ("\\" .. c:byte())
end
formatted = raw:gsub("[\1-\31]", _2_)
local load_fn = (_G.loadstring or load)(("return %s"):format(formatted))
dispatch(load_fn())
elseif prefixes[b] then
table.insert(stack, {prefix = prefixes[b]})
local nextb = getb()
if iswhitespace(nextb) then
if (b ~= 35) then
parse_error("invalid whitespace after quoting prefix")
end
stack[#stack] = nil
dispatch(utils.sym("#"))
end
ungetb(nextb)
elseif (issymbolchar(b) or (b == string.byte("~"))) then
local chars = {}
local bytestart = byteindex
while true do
chars[(#chars + 1)] = b
b = getb()
if (not b or not issymbolchar(b)) then
break
end
end
if b then
ungetb(b)
end
local rawstr = string.char(unpack(chars))
if (rawstr == "true") then
dispatch(true)
elseif (rawstr == "false") then
dispatch(false)
elseif (rawstr == "...") then
dispatch(utils.varg())
elseif rawstr:match("^:.+$") then
dispatch(rawstr:sub(2))
elseif (rawstr:match("^~") and (rawstr ~= "~=")) then
parse_error("illegal character: ~")
else
local force_number = rawstr:match("^%d")
local number_with_stripped_underscores = rawstr:gsub("_", "")
local x = nil
if force_number then
x = (tonumber(number_with_stripped_underscores) or parse_error(("could not read number \"" .. rawstr .. "\"")))
else
x = tonumber(number_with_stripped_underscores)
if not x then
if rawstr:match("%.[0-9]") then
byteindex = (((byteindex - #rawstr) + rawstr:find("%.[0-9]")) + 1)
parse_error(("can't start multisym segment " .. "with a digit: " .. rawstr))
elseif (rawstr:match("[%.:][%.:]") and (rawstr ~= "..") and (rawstr ~= "$...")) then
byteindex = ((byteindex - #rawstr) + 1 + rawstr:find("[%.:][%.:]"))
parse_error(("malformed multisym: " .. rawstr))
elseif rawstr:match(":.+[%.:]") then
byteindex = ((byteindex - #rawstr) + rawstr:find(":.+[%.:]"))
parse_error(("method must be last component " .. "of multisym: " .. rawstr))
else
x = utils.sym(rawstr, nil, {byteend = byteindex, bytestart = bytestart, filename = filename, line = line})
end
end
end
dispatch(x)
end
else
parse_error(("illegal character: " .. string.char(b)))
end
if done then
break
end
end
return true, retval
end
local function _0_()
stack = {}
return nil
end
return parse_stream, _0_
end
return {["string-stream"] = string_stream, granulate = granulate, parser = parser}
end
local utils = nil
package.preload["fennel.utils"] = package.preload["fennel.utils"] or function(...)
local function stablepairs(t)
local keys = {}
local succ = {}
for k in pairs(t) do
table.insert(keys, k)
end
local function _0_(a, b)
return (tostring(a) < tostring(b))
end
table.sort(keys, _0_)
for i, k in ipairs(keys) do
succ[k] = keys[(i + 1)]
end
local function stablenext(tbl, idx)
if (idx == nil) then
return keys[1], tbl[keys[1]]
else
return succ[idx], tbl[succ[idx]]
end
end
return stablenext, t, nil
end
local function map(t, f, out)
local out0 = (out or {})
local f0 = nil
if (type(f) == "function") then
f0 = f
else
local s = f
local function _0_(x)
return x[s]
end
f0 = _0_
end
for _, x in ipairs(t) do
local _1_0 = f0(x)
if (nil ~= _1_0) then
local v = _1_0
table.insert(out0, v)
end
end
return out0
end
local function kvmap(t, f, out)
local out0 = (out or {})
local f0 = nil
if (type(f) == "function") then
f0 = f
else
local s = f
local function _0_(x)
return x[s]
end
f0 = _0_
end
for k, x in stablepairs(t) do
local korv, v = f0(k, x)
if (korv and not v) then
table.insert(out0, korv)
end
if (korv and v) then
out0[korv] = v
end
end
return out0
end
local function copy(from)
local to = {}
for k, v in pairs((from or {})) do
to[k] = v
end
return to
end
local function allpairs(tbl)
assert((type(tbl) == "table"), "allpairs expects a table")
local t = tbl
local seen = {}
local function allpairs_next(_, state)
local next_state, value = next(t, state)
if seen[next_state] then
return allpairs_next(nil, next_state)
elseif next_state then
seen[next_state] = true
return next_state, value
else
local meta = getmetatable(t)
if (meta and meta.__index) then
t = meta.__index
return allpairs_next(t)
end
end
end
return allpairs_next
end
local function deref(self)
return self[1]
end
local nil_sym = nil
local function list_to_string(self, tostring2)
local safe, max = {}, 0
for k in pairs(self) do
if ((type(k) == "number") and (k > max)) then
max = k
end
end
for i = 1, max, 1 do
safe[i] = (((self[i] == nil) and nil_sym) or self[i])
end
return ("(" .. table.concat(map(safe, (tostring2 or tostring)), " ", 1, max) .. ")")
end
local SYMBOL_MT = {"SYMBOL", __fennelview = deref, __tostring = deref}
local EXPR_MT = {"EXPR", __tostring = deref}
local LIST_MT = {"LIST", __fennelview = list_to_string, __tostring = list_to_string}
local SEQUENCE_MARKER = {"SEQUENCE"}
local VARARG = setmetatable({"..."}, {"VARARG", __fennelview = deref, __tostring = deref})
local getenv = nil
local function _0_()
return nil
end
getenv = ((os and os.getenv) or _0_)
local function debug_on(flag)
local level = (getenv("FENNEL_DEBUG") or "")
return ((level == "all") or level:find(flag))
end
local function list(...)
return setmetatable({...}, LIST_MT)
end
local function sym(str, scope, source)
local s = {str, scope = scope}
for k, v in pairs((source or {})) do
if (type(k) == "string") then
s[k] = v
end
end
return setmetatable(s, SYMBOL_MT)
end
nil_sym = sym("nil")
local function sequence(...)
return setmetatable({...}, {sequence = SEQUENCE_MARKER})
end
local function expr(strcode, etype)
return setmetatable({strcode, type = etype}, EXPR_MT)
end
local function varg()
return VARARG
end
local function is_expr(x)
return ((type(x) == "table") and (getmetatable(x) == EXPR_MT) and x)
end
local function is_varg(x)
return ((x == VARARG) and x)
end
local function is_list(x)
return ((type(x) == "table") and (getmetatable(x) == LIST_MT) and x)
end
local function is_sym(x)
return ((type(x) == "table") and (getmetatable(x) == SYMBOL_MT) and x)
end
local function is_table(x)
return ((type(x) == "table") and (x ~= VARARG) and (getmetatable(x) ~= LIST_MT) and (getmetatable(x) ~= SYMBOL_MT) and x)
end
local function is_sequence(x)
local mt = ((type(x) == "table") and getmetatable(x))
return (mt and (mt.sequence == SEQUENCE_MARKER) and x)
end
local function is_multi_sym(str)
if is_sym(str) then
return is_multi_sym(tostring(str))
elseif (type(str) ~= "string") then
return false
else
local parts = {}
for part in str:gmatch("[^%.%:]+[%.%:]?") do
local last_char = part:sub(( - 1))
if (last_char == ":") then
parts["multi-sym-method-call"] = true
end
if ((last_char == ":") or (last_char == ".")) then
parts[(#parts + 1)] = part:sub(1, ( - 2))
else
parts[(#parts + 1)] = part
end
end
return ((#parts > 0) and (str:match("%.") or str:match(":")) and not str:match("%.%.") and (str:byte() ~= string.byte(".")) and (str:byte(( - 1)) ~= string.byte(".")) and parts)
end
end
local function is_quoted(symbol)
return symbol.quoted
end
local function walk_tree(root, f, custom_iterator)
local function walk(iterfn, parent, idx, node)
if f(idx, node, parent) then
for k, v in iterfn(node) do
walk(iterfn, node, k, v)
end
return nil
end
end
walk((custom_iterator or pairs), nil, nil, root)
return root
end
local lua_keywords = {"and", "break", "do", "else", "elseif", "end", "false", "for", "function", "if", "in", "local", "nil", "not", "or", "repeat", "return", "then", "true", "until", "while"}
for i, v in ipairs(lua_keywords) do
lua_keywords[v] = i
end
local function is_valid_lua_identifier(str)
return (str:match("^[%a_][%w_]*$") and not lua_keywords[str])
end
local propagated_options = {"allowedGlobals", "indent", "correlate", "useMetadata", "env"}
local function propagate_options(options, subopts)
for _, name in ipairs(propagated_options) do
subopts[name] = options[name]
end
return subopts
end
local root = nil
local function _1_()
end
root = {chunk = nil, options = nil, reset = _1_, scope = nil}
root["set-reset"] = function(new_root)
root.reset = function()
root.chunk, root.scope, root.options, root.reset = new_root.chunk, new_root.scope, new_root.options, new_root.reset
return nil
end
return root.reset
end
local _3_
do
local _2_0 = {"./?.fnl", "./?/init.fnl"}
table.insert(_2_0, getenv("FENNEL_PATH"))
_3_ = _2_0
end
return {["debug-on"] = debug_on, ["is-expr"] = is_expr, ["is-list"] = is_list, ["is-multi-sym"] = is_multi_sym, ["is-quoted"] = is_quoted, ["is-sequence"] = is_sequence, ["is-sym"] = is_sym, ["is-table"] = is_table, ["is-valid-lua-identifier"] = is_valid_lua_identifier, ["is-varg"] = is_varg, ["lua-keywords"] = lua_keywords, ["propagate-options"] = propagate_options, ["walk-tree"] = walk_tree, allpairs = allpairs, copy = copy, deref = deref, expr = expr, kvmap = kvmap, list = list, map = map, path = table.concat(_3_, ";"), root = root, sequence = sequence, stablepairs = stablepairs, sym = sym, varg = varg}
end
utils = require("fennel.utils")
local parser = require("fennel.parser")
local compiler = require("fennel.compiler")
local specials = require("fennel.specials")
local repl = require("fennel.repl")
local function eval(str, options, ...)
local opts = utils.copy(options)
local _ = nil
if ((opts.allowedGlobals == nil) and not getmetatable(opts.env)) then
opts.allowedGlobals = specials["current-global-names"](opts.env)
_ = nil
else
_ = nil
end
local env = (opts.env and specials["wrap-env"](opts.env))
local lua_source = compiler["compile-string"](str, opts)
local loader = nil
local function _1_(...)
if opts.filename then
return ("@" .. opts.filename)
else
return str
end
end
loader = specials["load-code"](lua_source, env, _1_(...))
opts.filename = nil
return loader(...)
end
local function dofile_2a(filename, options, ...)
local opts = utils.copy(options)
local f = assert(io.open(filename, "rb"))
local source = f:read("*all")
f:close()
opts.filename = filename
return eval(source, opts, ...)
end
local mod = {["compile-stream"] = compiler["compile-stream"], ["compile-string"] = compiler["compile-string"], ["load-code"] = specials["load-code"], ["macro-loaded"] = specials["macro-loaded"], ["make-searcher"] = specials["make-searcher"], ["search-module"] = specials["search-module"], ["string-stream"] = parser["string-stream"], compile = compiler.compile, compile1 = compiler.compile1, compileStream = compiler["compile-stream"], compileString = compiler["compile-string"], doc = specials.doc, dofile = dofile_2a, eval = eval, gensym = compiler.gensym, granulate = parser.granulate, list = utils.list, loadCode = specials["load-code"], macroLoaded = specials["macro-loaded"], makeSearcher = specials["make-searcher"], make_searcher = specials["make-searcher"], mangle = compiler["global-mangling"], metadata = compiler.metadata, parser = parser.parser, path = utils.path, repl = repl, scope = compiler["make-scope"], searchModule = specials["search-module"], searcher = specials["make-searcher"](), stringStream = parser["string-stream"], sym = utils.sym, traceback = compiler.traceback, unmangle = compiler["global-unmangling"], varg = utils.varg, version = "0.5.0"}
utils["fennel-module"] = mod
do
local builtin_macros = [===[;; The code for these macros is somewhat idiosyncratic because it cannot use any
;; macros which have not yet been defined.
(fn -> [val ...]
"Thread-first macro.
Take the first value and splice it into the second form as its first argument.
The value of the second form is spliced into the first arg of the third, etc."
(var x val)
(each [_ e (ipairs [...])]
(let [elt (if (list? e) e (list e))]
(table.insert elt 2 x)
(set x elt)))
x)
(fn ->> [val ...]
"Thread-last macro.
Same as ->, except splices the value into the last position of each form
rather than the first."
(var x val)
(each [_ e (pairs [...])]
(let [elt (if (list? e) e (list e))]
(table.insert elt x)
(set x elt)))
x)
(fn -?> [val ...]
"Nil-safe thread-first macro.
Same as -> except will short-circuit with nil when it encounters a nil value."
(if (= 0 (select "#" ...))
val
(let [els [...]
e (table.remove els 1)
el (if (list? e) e (list e))
tmp (gensym)]
(table.insert el 2 tmp)
`(let [,tmp ,val]
(if ,tmp
(-?> ,el ,(unpack els))
,tmp)))))
(fn -?>> [val ...]
"Nil-safe thread-last macro.
Same as ->> except will short-circuit with nil when it encounters a nil value."
(if (= 0 (select "#" ...))
val
(let [els [...]
e (table.remove els 1)
el (if (list? e) e (list e))
tmp (gensym)]
(table.insert el tmp)
`(let [,tmp ,val]
(if ,tmp
(-?>> ,el ,(unpack els))
,tmp)))))
(fn doto [val ...]
"Evaluates val and splices it into the first argument of subsequent forms."
(let [name (gensym)
form `(let [,name ,val])]
(each [_ elt (pairs [...])]
(table.insert elt 2 name)
(table.insert form elt))
(table.insert form name)
form))
(fn when [condition body1 ...]
"Evaluate body for side-effects only when condition is truthy."
(assert body1 "expected body")
`(if ,condition
(do ,body1 ,...)))
(fn with-open [closable-bindings ...]
"Like `let`, but invokes (v:close) on each binding after evaluating the body.
The body is evaluated inside `xpcall` so that bound values will be closed upon
encountering an error before propagating it."
(let [bodyfn `(fn [] ,...)
closer `(fn close-handlers# [ok# ...] (if ok# ...
(error ... 0)))
traceback `(. (or package.loaded.fennel debug) :traceback)]
(for [i 1 (# closable-bindings) 2]
(assert (sym? (. closable-bindings i))
"with-open only allows symbols in bindings")
(table.insert closer 4 `(: ,(. closable-bindings i) :close)))
`(let ,closable-bindings ,closer
(close-handlers# (xpcall ,bodyfn ,traceback)))))
(fn partial [f ...]
"Returns a function with all arguments partially applied to f."
(let [body (list f ...)]
(table.insert body _VARARG)
`(fn [,_VARARG] ,body)))
(fn pick-args [n f]
"Creates a function of arity n that applies its arguments to f.
For example,
(pick-args 2 func)
expands to
(fn [_0_ _1_] (func _0_ _1_))"
(assert (and (= (type n) :number) (= n (math.floor n)) (>= n 0))
"Expected n to be an integer literal >= 0.")
(let [bindings []]
(for [i 1 n] (tset bindings i (gensym)))
`(fn ,bindings (,f ,(unpack bindings)))))
(fn pick-values [n ...]
"Like the `values` special, but emits exactly n values.
For example,
(pick-values 2 ...)
expands to
(let [(_0_ _1_) ...]
(values _0_ _1_))"
(assert (and (= :number (type n)) (>= n 0) (= n (math.floor n)))
"Expected n to be an integer >= 0")
(let [let-syms (list)
let-values (if (= 1 (select :# ...)) ... `(values ,...))]
(for [i 1 n] (table.insert let-syms (gensym)))
(if (= n 0) `(values)
`(let [,let-syms ,let-values] (values ,(unpack let-syms))))))
(fn lambda [...]
"Function literal with arity checking.
Will throw an exception if a declared argument is passed in as nil, unless
that argument name begins with ?."
(let [args [...]
has-internal-name? (sym? (. args 1))
arglist (if has-internal-name? (. args 2) (. args 1))
docstring-position (if has-internal-name? 3 2)
has-docstring? (and (> (# args) docstring-position)
(= :string (type (. args docstring-position))))
arity-check-position (- 4 (if has-internal-name? 0 1)
(if has-docstring? 0 1))
empty-body? (< (# args) arity-check-position)]
(fn check! [a]
(if (table? a)
(each [_ a (pairs a)]
(check! a))
(and (not (: (tostring a) :match "^?"))
(not= (tostring a) "&")
(not= (tostring a) "..."))
(table.insert args arity-check-position
`(assert (not= nil ,a)
(: "Missing argument %s on %s:%s"
:format ,(tostring a)
,(or a.filename "unknown")
,(or a.line "?"))))))
(assert (= :table (type arglist)) "expected arg list")
(each [_ a (ipairs arglist)]
(check! a))
(if empty-body?
(table.insert args (sym :nil)))
`(fn ,(unpack args))))
(fn macro [name ...]
"Define a single macro."
(assert (sym? name) "expected symbol for macro name")
(local args [...])
`(macros { ,(tostring name) (fn ,name ,(unpack args))}))
(fn macrodebug [form return?]
"Print the resulting form after performing macroexpansion.
With a second argument, returns expanded form as a string instead of printing."
(let [(ok view) (pcall require :fennelview)
handle (if return? `do `print)]
`(,handle ,((if ok view tostring) (macroexpand form _SCOPE)))))
(fn import-macros [binding1 module-name1 ...]
"Binds a table of macros from each macro module according to a binding form.
Each binding form can be either a symbol or a k/v destructuring table.
Example:
(import-macros mymacros :my-macros ; bind to symbol
{:macro1 alias : macro2} :proj.macros) ; import by name"
(assert (and binding1 module-name1 (= 0 (% (select :# ...) 2)))
"expected even number of binding/modulename pairs")
(for [i 1 (select :# binding1 module-name1 ...) 2]
(local (binding modname) (select i binding1 module-name1 ...))
;; generate a subscope of current scope, use require-macros
;; to bring in macro module. after that, we just copy the
;; macros from subscope to scope.
(local scope (get-scope))
(local subscope (fennel.scope scope))
(fennel.compile-string (string.format "(require-macros %q)"
modname)
{:scope subscope})
(if (sym? binding)
;; bind whole table of macros to table bound to symbol
(do (tset scope.macros (. binding 1) {})
(each [k v (pairs subscope.macros)]
(tset (. scope.macros (. binding 1)) k v)))
;; 1-level table destructuring for importing individual macros
(table? binding)
(each [macro-name [import-key] (pairs binding)]
(assert (= :function (type (. subscope.macros macro-name)))
(.. "macro " macro-name " not found in module " modname))
(tset scope.macros import-key (. subscope.macros macro-name)))))
nil)
;;; Pattern matching
(fn match-pattern [vals pattern unifications]
"Takes the AST of values and a single pattern and returns a condition
to determine if it matches as well as a list of bindings to
introduce for the duration of the body if it does match."
;; we have to assume we're matching against multiple values here until we
;; know we're either in a multi-valued clause (in which case we know the #
;; of vals) or we're not, in which case we only care about the first one.
(let [[val] vals]
(if (or (and (sym? pattern) ; unification with outer locals (or nil)
(not= :_ (tostring pattern)) ; never unify _
(or (in-scope? pattern)
(= :nil (tostring pattern))))
(and (multi-sym? pattern)
(in-scope? (. (multi-sym? pattern) 1))))
(values `(= ,val ,pattern) [])
;; unify a local we've seen already
(and (sym? pattern)
(. unifications (tostring pattern)))
(values `(= ,(. unifications (tostring pattern)) ,val) [])
;; bind a fresh local
(sym? pattern)
(let [wildcard? (= (tostring pattern) "_")]
(if (not wildcard?) (tset unifications (tostring pattern) val))
(values (if (or wildcard? (: (tostring pattern) :find "^?"))
true `(not= ,(sym :nil) ,val))
[pattern val]))
;; guard clause
(and (list? pattern) (sym? (. pattern 2)) (= :? (tostring (. pattern 2))))
(let [(pcondition bindings) (match-pattern vals (. pattern 1)
unifications)
condition `(and ,pcondition)]
(for [i 3 (# pattern)] ; splice in guard clauses
(table.insert condition (. pattern i)))
(values `(let ,bindings ,condition) bindings))
;; multi-valued patterns (represented as lists)
(list? pattern)
(let [condition `(and)
bindings []]
(each [i pat (ipairs pattern)]
(let [(subcondition subbindings) (match-pattern [(. vals i)] pat
unifications)]
(table.insert condition subcondition)
(each [_ b (ipairs subbindings)]
(table.insert bindings b))))
(values condition bindings))
;; table patterns
(= (type pattern) :table)
(let [condition `(and (= (type ,val) :table))
bindings []]
(each [k pat (pairs pattern)]
(if (and (sym? pat) (= "&" (tostring pat)))
(do (assert (not (. pattern (+ k 2)))
"expected rest argument before last parameter")
(table.insert bindings (. pattern (+ k 1)))
(table.insert bindings [`(select ,k ((or _G.unpack
table.unpack)
,val))]))
(and (= :number (type k))
(= "&" (tostring (. pattern (- k 1)))))
nil ; don't process the pattern right after &; already got it
(let [subval `(. ,val ,k)
(subcondition subbindings) (match-pattern [subval] pat
unifications)]
(table.insert condition subcondition)
(each [_ b (ipairs subbindings)]
(table.insert bindings b)))))
(values condition bindings))
;; literal value
(values `(= ,val ,pattern) []))))
(fn match-condition [vals clauses]
"Construct the actual `if` AST for the given match values and clauses."
(if (not= 0 (% (length clauses) 2)) ; treat odd final clause as default
(table.insert clauses (length clauses) (sym :_)))
(let [out `(if)]
(for [i 1 (length clauses) 2]
(let [pattern (. clauses i)
body (. clauses (+ i 1))
(condition bindings) (match-pattern vals pattern {})]
(table.insert out condition)
(table.insert out `(let ,bindings ,body))))
out))
(fn match-val-syms [clauses]
"How many multi-valued clauses are there? return a list of that many gensyms."
(let [syms (list (gensym))]
(for [i 1 (length clauses) 2]
(if (list? (. clauses i))
(each [valnum (ipairs (. clauses i))]
(if (not (. syms valnum))
(tset syms valnum (gensym))))))
syms))
(fn match [val ...]
"Perform pattern matching on val. See reference for details."
(let [clauses [...]
vals (match-val-syms clauses)]
;; protect against multiple evaluation of the value, bind against as
;; many values as we ever match against in the clauses.
(list `let [vals val]
(match-condition vals clauses))))
{: -> : ->> : -?> : -?>>
: doto : when : with-open
: partial : lambda
: pick-args : pick-values
: macro : macrodebug : import-macros
: match}
]===]
local module_name = "fennel.macros"
local _ = nil
local function _0_()
return mod
end
package.preload[module_name] = _0_
_ = nil
local env = specials["make-compiler-env"](nil, compiler.scopes.compiler, {})
local built_ins = eval(builtin_macros, {allowedGlobals = false, env = env, filename = "src/fennel/macros.fnl", moduleName = module_name, scope = compiler.scopes.compiler, useMetadata = true})
for k, v in pairs(built_ins) do
compiler.scopes.global.macros[k] = v
end
compiler.scopes.global.macros["\206\187"] = compiler.scopes.global.macros.lambda
package.preload[module_name] = nil
end
return mod