Merge pull request #12 from typst/unicode-escape
Unicode escape sequences in strings and body text
This commit is contained in:
Laurenz
GitHub
commit
07f387d088
@ -110,6 +110,26 @@ impl Parser<'_> {
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self.with_span(SyntaxNode::Text(text.to_string()))
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}
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Token::UnicodeEscape { sequence, terminated } => {
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if !terminated {
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error!(
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@self.feedback, Span::at(token.span.end),
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"expected closing brace",
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);
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}
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if let Some(c) = unescape_char(sequence) {
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self.with_span(SyntaxNode::Text(c.to_string()))
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} else {
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self.eat();
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error!(
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@self.feedback, token.span,
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"invalid unicode escape sequence",
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);
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continue;
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}
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}
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unexpected => {
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self.eat();
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error!(
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@ -594,7 +614,7 @@ impl Group {
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}
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fn unescape_string(string: &str) -> String {
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let mut iter = string.chars();
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let mut iter = string.chars().peekable();
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let mut out = String::with_capacity(string.len());
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while let Some(c) = iter.next() {
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@ -602,6 +622,36 @@ fn unescape_string(string: &str) -> String {
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match iter.next() {
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Some('\\') => out.push('\\'),
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Some('"') => out.push('"'),
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Some('u') if iter.peek() == Some(&'{') => {
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iter.next();
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let mut sequence = String::new();
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let terminated = loop {
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match iter.peek() {
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// TODO: Feedback that closing brace is missing.
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Some('}') => {
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iter.next();
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break true;
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}
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Some(&c) if c.is_ascii_hexdigit() => {
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iter.next();
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sequence.push(c);
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}
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_ => break false,
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}
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};
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// TODO: Feedback that escape sequence is wrong.
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if let Some(c) = unescape_char(&sequence) {
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out.push(c);
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} else {
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out.push_str("\\u{");
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out.push_str(&sequence);
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if terminated {
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out.push('}');
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}
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}
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}
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Some('n') => out.push('\n'),
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Some('t') => out.push('\t'),
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Some(c) => { out.push('\\'); out.push(c); }
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@ -617,7 +667,7 @@ fn unescape_string(string: &str) -> String {
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/// Unescape raw markup and split it into into lines.
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fn unescape_raw(raw: &str) -> Vec<String> {
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let mut iter = raw.chars().peekable();
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let mut iter = raw.chars();
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let mut text = String::new();
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while let Some(c) = iter.next() {
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@ -705,6 +755,11 @@ fn unescape_code(raw: &str) -> Vec<String> {
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split_lines(&text)
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}
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/// Converts a hexademical sequence (without braces or "\u") into a character.
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fn unescape_char(sequence: &str) -> Option<char> {
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u32::from_str_radix(sequence, 16).ok().and_then(std::char::from_u32)
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}
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fn split_lines(text: &str) -> Vec<String> {
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let mut iter = text.chars().peekable();
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let mut line = String::new();
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@ -890,6 +945,9 @@ mod tests {
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test(r#"hello world"#, "hello world");
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test(r#"hello\nworld"#, "hello\nworld");
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test(r#"a\"bc"#, "a\"bc");
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test(r#"a\u{2603}bc"#, "a☃bc");
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test(r#"a\u{26c3bg"#, "a𦰻g");
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test(r#"av\u{6797"#, "av林");
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test(r#"a\\"#, "a\\");
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test(r#"a\\\nbc"#, "a\\\nbc");
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test(r#"a\tbc"#, "a\tbc");
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@ -944,6 +1002,7 @@ mod tests {
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t!("*hi" => B, T("hi"));
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t!("hi_" => T("hi"), I);
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t!("hi you" => T("hi"), S, T("you"));
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t!("\\u{1f303}" => T("🌃"));
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t!("\n\n\nhello" => P, T("hello"));
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t!(r"a\ b" => T("a"), L, S, T("b"));
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t!("`py`" => R!["py"]);
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@ -951,17 +1010,16 @@ mod tests {
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e!("`hi\nyou" => s(1,3, 1,3, "expected backtick"));
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t!("`hi\\`du`" => R!["hi`du"]);
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t!("```java System.out.print```" => C![
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Some("java"), "System.out.print"
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]);
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t!("``` console.log(\n\"alert\"\n)" => C![
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None, "console.log(", "\"alert\"", ")"
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]);
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t!("```java System.out.print```" => C![Some("java"), "System.out.print"]);
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t!("``` console.log(\n\"alert\"\n)" => C![None, "console.log(", "\"alert\"", ")"]);
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t!("```typst \r\n Typst uses `\\`` to indicate code blocks" => C![
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Some("typst"), " Typst uses ``` to indicate code blocks"
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]);
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e!("``` hi\nyou" => s(1,3, 1,3, "expected backticks"));
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e!("```🌍 hi\nyou```" => s(0,3, 0,4, "invalid identifier"));
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e!("``` hi\nyou" => s(1,3, 1,3, "expected backticks"));
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e!("```🌍 hi\nyou```" => s(0,3, 0,4, "invalid identifier"));
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e!("\\u{d421c809}" => s(0,0, 0,12, "invalid unicode escape sequence"));
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e!("\\u{abc" => s(0,6, 0,6, "expected closing brace"));
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t!("💜\n\n 🌍" => T("💜"), P, T("🌍"));
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ts!("hi" => s(0,0, 0,2, T("hi")));
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@ -82,6 +82,14 @@ pub enum Token<'s> {
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/// A backslash followed by whitespace in text.
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Backslash,
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/// A unicode escape sequence.
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UnicodeEscape {
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/// The escape sequence between two braces.
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sequence: &'s str,
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/// Whether the closing brace was present.
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terminated: bool,
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},
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/// Raw text.
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Raw {
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/// The raw text (not yet unescaped as for strings).
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@ -136,6 +144,7 @@ impl<'s> Token<'s> {
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Star => "star",
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Underscore => "underscore",
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Backslash => "backslash",
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UnicodeEscape { .. } => "unicode escape sequence",
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Raw { .. } => "raw text",
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Code { .. } => "code block",
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Text(_) => "text",
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@ -426,6 +435,25 @@ impl<'s> Tokens<'s> {
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}
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match self.peek() {
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Some('u') => {
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self.eat();
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if self.peek() == Some('{') {
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self.eat();
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let sequence = self.read_string_until(
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|c| !c.is_ascii_hexdigit(),
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false, 0, 0,
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).0;
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let terminated = self.peek() == Some('}');
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if terminated {
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self.eat();
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}
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UnicodeEscape { sequence, terminated }
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} else {
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Text("\\u")
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}
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}
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Some(c) if is_escapable(c) => {
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let index = self.index();
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self.eat();
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@ -588,6 +616,7 @@ mod tests {
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fn Code<'a>(lang: Option<&'a str>, raw: &'a str, terminated: bool) -> Token<'a> {
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Token::Code { lang: lang.map(Spanned::zero), raw, terminated }
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}
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fn UE(sequence: &str, terminated: bool) -> Token { Token::UnicodeEscape { sequence, terminated } }
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macro_rules! t { ($($tts:tt)*) => {test!(@spans=false, $($tts)*)} }
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macro_rules! ts { ($($tts:tt)*) => {test!(@spans=true, $($tts)*)} }
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@ -701,14 +730,16 @@ mod tests {
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#[test]
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fn tokenize_escaped_symbols() {
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t!(Body, r"\\" => T(r"\"));
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t!(Body, r"\[" => T("["));
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t!(Body, r"\]" => T("]"));
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t!(Body, r"\*" => T("*"));
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t!(Body, r"\_" => T("_"));
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t!(Body, r"\`" => T("`"));
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t!(Body, r"\/" => T("/"));
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t!(Body, r#"\""# => T("\""));
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t!(Body, r"\\" => T(r"\"));
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t!(Body, r"\[" => T("["));
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t!(Body, r"\]" => T("]"));
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t!(Body, r"\*" => T("*"));
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t!(Body, r"\_" => T("_"));
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t!(Body, r"\`" => T("`"));
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t!(Body, r"\/" => T("/"));
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t!(Body, r"\u{2603}" => UE("2603", true));
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t!(Body, r"\u{26A4" => UE("26A4", false));
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t!(Body, r#"\""# => T("\""));
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}
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#[test]
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@ -716,6 +747,9 @@ mod tests {
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t!(Body, r"\a" => T("\\"), T("a"));
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t!(Body, r"\:" => T(r"\"), T(":"));
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t!(Body, r"\=" => T(r"\"), T("="));
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t!(Body, r"\u{2GA4"=> UE("2", false), T("GA4"));
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t!(Body, r"\u{ " => UE("", false), Space(0));
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t!(Body, r"\u" => T(r"\u"));
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t!(Header, r"\\\\" => Invalid(r"\\\\"));
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t!(Header, r"\a" => Invalid(r"\a"));
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t!(Header, r"\:" => Invalid(r"\"), Colon);
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