106 lines
2.3 KiB
Rust
106 lines
2.3 KiB
Rust
use nom::{IResult, InputLength, InputTake};
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use super::{
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combinator::{blank_lines, line_ends_iter, node, GreenElement},
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input::Input,
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keyword::affiliated_keyword_nodes,
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object::standard_object_nodes,
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SyntaxKind,
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};
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/// Recognizes one paragraph
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pub fn paragraph_node(input: Input) -> IResult<Input, GreenElement, ()> {
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crate::lossless_parser!(paragraph_node_base, input)
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}
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/// Recognizes multiple paragraphs
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pub fn paragraph_nodes(input: Input) -> Result<Vec<GreenElement>, nom::Err<()>> {
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let mut i = input;
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let mut children = vec![];
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while !i.is_empty() {
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let (input, node) = paragraph_node(i)?;
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children.push(node);
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debug_assert!(
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i.input_len() > input.input_len(),
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"{} > {}",
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i.input_len(),
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input.input_len()
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);
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i = input;
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}
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Ok(children)
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}
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fn paragraph_node_base(input: Input) -> IResult<Input, GreenElement, ()> {
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debug_assert!(!input.is_empty());
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let (input, keywords) = affiliated_keyword_nodes(input)?;
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let mut start = 0;
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for idx in line_ends_iter(input.as_str()) {
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// stops at blank line
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if input.s[start..idx].bytes().all(|c| c.is_ascii_whitespace()) {
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break;
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}
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start = idx;
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}
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let (input, contents) = input.take_split(start);
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let (input, post_blank) = blank_lines(input)?;
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let mut children = vec![];
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children.extend(keywords);
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children.extend(standard_object_nodes(contents));
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children.extend(post_blank);
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Ok((input, node(SyntaxKind::PARAGRAPH, children)))
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}
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#[test]
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fn parse() {
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use crate::{ast::Paragraph, tests::to_ast};
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let to_paragraph = to_ast::<Paragraph>(paragraph_node);
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insta::assert_debug_snapshot!(
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to_paragraph(r#"a"#).syntax,
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@r###"
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PARAGRAPH@0..1
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TEXT@0..1 "a"
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"###
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);
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insta::assert_debug_snapshot!(
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to_paragraph(r#"a
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"#).syntax,
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@r###"
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PARAGRAPH@0..6
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TEXT@0..2 "a\n"
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BLANK_LINE@2..6 " "
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"###
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);
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insta::assert_debug_snapshot!(
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to_paragraph(r#"a
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b
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c
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"#).syntax,
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@r###"
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PARAGRAPH@0..6
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TEXT@0..6 "a\nb\nc\n"
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"###
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);
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insta::assert_debug_snapshot!(
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to_paragraph(r#"a
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c
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"#).syntax,
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@r###"
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PARAGRAPH@0..3
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TEXT@0..2 "a\n"
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BLANK_LINE@2..3 "\n"
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"###
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);
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}
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