diff options
| -rw-r--r-- | helix-lsp/src/snippet.rs | 149 |
1 files changed, 111 insertions, 38 deletions
diff --git a/helix-lsp/src/snippet.rs b/helix-lsp/src/snippet.rs index 4706a984..aa3496ed 100644 --- a/helix-lsp/src/snippet.rs +++ b/helix-lsp/src/snippet.rs @@ -11,17 +11,17 @@ pub enum CaseChange { } #[derive(Debug, PartialEq, Eq)] -pub enum FormatItem<'a> { +pub enum FormatItem { Text(Tendril), Capture(usize), CaseChange(usize, CaseChange), - Conditional(usize, Option<&'a str>, Option<&'a str>), + Conditional(usize, Option<Tendril>, Option<Tendril>), } #[derive(Debug, PartialEq, Eq)] -pub struct Regex<'a> { +pub struct Regex { value: Tendril, - replacement: Vec<FormatItem<'a>>, + replacement: Vec<FormatItem>, options: Tendril, } @@ -40,8 +40,8 @@ pub enum SnippetElement<'a> { }, Variable { name: &'a str, - default: Option<&'a str>, - regex: Option<Regex<'a>>, + default: Option<Vec<SnippetElement<'a>>>, + regex: Option<Regex>, }, Text(Tendril), } @@ -77,15 +77,20 @@ fn render_elements( *offset += text.chars().count(); insert.push_str(&text); } - &Variable { + Variable { name: _, regex: _, r#default, } => { // TODO: variables. For now, fall back to the default, which defaults to "". - let text = r#default.unwrap_or_default(); - *offset += text.chars().count(); - insert.push_str(text); + render_elements( + r#default.as_deref().unwrap_or_default(), + insert, + offset, + tabstops, + newline_with_offset, + include_placeholer, + ); } &Tabstop { tabstop } => { tabstops.push((tabstop, (*offset, *offset))); @@ -212,25 +217,28 @@ mod parser { } const TEXT_ESCAPE_CHARS: &[char] = &['\\', '}', '$']; - const REPLACE_ESCAPE_CHARS: &[char] = &['\\', '}', '$', '/']; - const CHOICE_TEXT_ESCAPE_CHARS: &[char] = &['\\', '}', '$', '|', ',']; + const CHOICE_TEXT_ESCAPE_CHARS: &[char] = &['\\', '|', ',']; - fn text<'a>(escape_chars: &'static [char]) -> impl Parser<'a, Output = Tendril> { + fn text<'a>( + escape_chars: &'static [char], + term_chars: &'static [char], + ) -> impl Parser<'a, Output = Tendril> { move |input: &'a str| { - let mut chars = input.char_indices(); + let mut chars = input.char_indices().peekable(); let mut res = Tendril::new(); while let Some((i, c)) = chars.next() { match c { '\\' => { - if let Some((_, c)) = chars.next() { + if let Some(&(_, c)) = chars.peek() { if escape_chars.contains(&c) { + chars.next(); res.push(c); continue; } } - return Ok((&input[i..], res)); + res.push('\\'); } - c if escape_chars.contains(&c) => return Ok((&input[i..], res)), + c if term_chars.contains(&c) => return Ok((&input[i..], res)), c => res.push(c), } } @@ -253,7 +261,7 @@ mod parser { ) } - fn format<'a>() -> impl Parser<'a, Output = FormatItem<'a>> { + fn format<'a>() -> impl Parser<'a, Output = FormatItem> { use FormatItem::*; choice!( @@ -267,7 +275,7 @@ mod parser { }), // '${' int ':+' if '}' map( - seq!("${", digit(), ":+", take_until(|c| c == '}'), "}"), + seq!("${", digit(), ":+", text(TEXT_ESCAPE_CHARS, &['}']), "}"), |seq| { Conditional(seq.1, Some(seq.3), None) } ), // '${' int ':?' if ':' else '}' @@ -276,9 +284,9 @@ mod parser { "${", digit(), ":?", - take_until(|c| c == ':'), + text(TEXT_ESCAPE_CHARS, &[':']), ":", - take_until(|c| c == '}'), + text(TEXT_ESCAPE_CHARS, &['}']), "}" ), |seq| { Conditional(seq.1, Some(seq.3), Some(seq.5)) } @@ -290,7 +298,7 @@ mod parser { digit(), ":", optional("-"), - take_until(|c| c == '}'), + text(TEXT_ESCAPE_CHARS, &['}']), "}" ), |seq| { Conditional(seq.1, None, Some(seq.4)) } @@ -298,19 +306,24 @@ mod parser { ) } - fn regex<'a>() -> impl Parser<'a, Output = Regex<'a>> { + fn regex<'a>() -> impl Parser<'a, Output = Regex> { map( seq!( "/", // TODO parse as ECMAScript and convert to rust regex - non_empty(text(&['/', '\\'])), + non_empty(text(&['/'], &['/'])), "/", one_or_more(choice!( format(), - map(text(REPLACE_ESCAPE_CHARS), FormatItem::Text) + // text doesn't parse $, if format fails we just accept the $ as text + map("$", |_| FormatItem::Text("$".into())), + map(text(&['\\', '/'], &['/', '$']), FormatItem::Text), )), "/", - text(&['}', '\\',]), + // vscode really doesn't allow escaping } here + // so it's impossible to write a regex escape containing a } + // we can consider deviating here and allowing the escape + text(&[], &['}']), ), |(_, value, _, replacement, _, options)| Regex { value, @@ -341,7 +354,7 @@ mod parser { // The example there contains both a placeholder text and a nested placeholder // which indicates a list. Looking at the VSCode sourcecode, the placeholder // is indeed parsed as zero_or_more so the grammar is simply incorrect here - zero_or_more(anything(TEXT_ESCAPE_CHARS)), + zero_or_more(anything(TEXT_ESCAPE_CHARS, true)), "}" ), |seq| SnippetElement::Placeholder { @@ -357,7 +370,7 @@ mod parser { "${", digit(), "|", - sep(text(CHOICE_TEXT_ESCAPE_CHARS), ","), + sep(text(CHOICE_TEXT_ESCAPE_CHARS, &['|', ',']), ","), "|}", ), |seq| SnippetElement::Choice { @@ -377,7 +390,13 @@ mod parser { }), // ${var:default} map( - seq!("${", var(), ":", take_until(|c| c == '}'), "}",), + seq!( + "${", + var(), + ":", + zero_or_more(anything(TEXT_ESCAPE_CHARS, true)), + "}", + ), |values| SnippetElement::Variable { name: values.1, default: Some(values.3), @@ -395,22 +414,27 @@ mod parser { ) } - fn anything<'a>(escape_chars: &'static [char]) -> impl Parser<'a, Output = SnippetElement<'a>> { + fn anything<'a>( + escape_chars: &'static [char], + end_at_brace: bool, + ) -> impl Parser<'a, Output = SnippetElement<'a>> { + let term_chars: &[_] = if end_at_brace { &['$', '}'] } else { &['$'] }; move |input: &'a str| { let parser = choice!( tabstop(), placeholder(), choice(), variable(), - map(text(escape_chars), SnippetElement::Text) + map("$", |_| SnippetElement::Text("$".into())), + map(text(escape_chars, term_chars), SnippetElement::Text), ); parser.parse(input) } } fn snippet<'a>() -> impl Parser<'a, Output = Snippet<'a>> { - map(one_or_more(anything(TEXT_ESCAPE_CHARS)), |parts| Snippet { - elements: parts, + map(one_or_more(anything(TEXT_ESCAPE_CHARS, false)), |parts| { + Snippet { elements: parts } }) } @@ -452,8 +476,13 @@ mod parser { } #[test] - fn parse_unterminated_placeholder_error() { - assert_eq!(Err("${1:)"), parse("match(${1:)")) + fn unterminated_placeholder() { + assert_eq!( + Ok(Snippet { + elements: vec![Text("match(".into()), Text("$".into()), Text("{1:)".into())] + }), + parse("match(${1:)") + ) } #[test] @@ -542,7 +571,7 @@ mod parser { Text(" ".into()), Variable { name: "name", - default: Some("foo"), + default: Some(vec![Text("foo".into())]), regex: None }, Text(" ".into()), @@ -572,12 +601,56 @@ mod parser { default: None, regex: Some(Regex { value: "(.*).+$".into(), - replacement: vec![FormatItem::Capture(1)], + replacement: vec![FormatItem::Capture(1), FormatItem::Text("$".into())], options: Tendril::new(), }), }] }), - parse("${TM_FILENAME/(.*).+$/$1/}") + parse("${TM_FILENAME/(.*).+$/$1$/}") + ); + } + + #[test] + fn rust_macro() { + assert_eq!( + Ok(Snippet { + elements: vec![ + Text("macro_rules! ".into()), + Tabstop { tabstop: 1 }, + Text(" {\n (".into()), + Tabstop { tabstop: 2 }, + Text(") => {\n ".into()), + Tabstop { tabstop: 0 }, + Text("\n };\n}".into()) + ] + }), + parse("macro_rules! $1 {\n ($2) => {\n $0\n };\n}") + ); + } + #[test] + fn robust_parsing() { + assert_eq!( + Ok(Snippet { + elements: vec![ + Text("$".into()), + Text("{}".into()), + Text("$".into()), + Text("\\a$}\\".into()), + ] + }), + parse("${}$\\a\\$\\}\\\\") + ); + assert_eq!( + Ok(Snippet { + elements: vec![ + Placeholder { + tabstop: 1, + value: vec![Text("$".into()), Text("{".into())] + }, + Text("}".into()) + ] + }), + parse("${1:${}}") ); } } |