chore: prepare for v0.10.0-alpha.1

src/syntax/comment.rs

@@ -0,0 +1,85 @@
+use nom::{IResult, InputTake};
+
+use super::{
+    combinator::{blank_lines, debug_assert_lossless, line_ends_iter, node, GreenElement},
+    input::Input,
+    SyntaxKind,
+};
+
+fn comment_node_base(input: Input) -> IResult<Input, GreenElement, ()> {
+    let mut start = 0;
+    for i in line_ends_iter(input.as_str()) {
+        let line = &input.as_str()[start..i];
+        let trimmed = line.trim_start();
+
+        if trimmed == "#" || trimmed == "#\n" || trimmed == "#\r\n" || trimmed.starts_with("# ") {
+            start = i;
+        } else {
+            break;
+        }
+    }
+
+    if start == 0 {
+        return Err(nom::Err::Error(()));
+    }
+
+    let (input, contents) = input.take_split(start);
+    let (input, post_blank) = blank_lines(input)?;
+
+    let mut children = vec![];
+    children.push(contents.text_token());
+    children.extend(post_blank);
+
+    Ok((input, node(SyntaxKind::COMMENT, children)))
+}
+
+pub fn comment_node(input: Input) -> IResult<Input, GreenElement, ()> {
+    debug_assert_lossless(comment_node_base)(input)
+}
+
+#[test]
+fn parse() {
+    use crate::{
+        syntax::{comment::comment_node, input::Input, SyntaxNode},
+        ParseConfig,
+    };
+
+    let t = |input: &str| {
+        SyntaxNode::new_root(
+            comment_node(Input {
+                s: input,
+                c: &ParseConfig::default(),
+            })
+            .unwrap()
+            .1
+            .into_node()
+            .unwrap(),
+        )
+    };
+
+    insta::assert_debug_snapshot!(
+        t("#"),
+        @r###"
+    COMMENT@0..1
+      TEXT@0..1 "#"
+    "###
+    );
+
+    insta::assert_debug_snapshot!(
+        t("#\n  # a\n #\n\n"),
+        @r###"
+    COMMENT@0..12
+      TEXT@0..11 "#\n  # a\n #\n"
+      BLANK_LINE@11..12
+        NEW_LINE@11..12 "\n"
+    "###
+    );
+
+    insta::assert_debug_snapshot!(
+        t("#\na\n #\n\n"),
+        @r###"
+    COMMENT@0..2
+      TEXT@0..2 "#\n"
+    "###
+    );
+}