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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,122 @@ | ||
| use text_scanner::ext::{SwiftScannerExt, SwiftStrExt}; | ||
| use text_scanner::Scanner; | ||
|
|
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| use crate::{impl_lexer_from_scanner, ScanToken, ScannerExt, TokenSpan}; | ||
|
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| #[derive(PartialEq, Eq, Clone, Copy, Debug)] | ||
| pub enum SwiftToken { | ||
| Space, | ||
| LineComment, | ||
| BlockComment, | ||
| Ident, | ||
| AttribName, | ||
| Keyword, | ||
| Punct, | ||
| Delim, | ||
| Nil, | ||
| Boolean, | ||
| Int, | ||
| Float, | ||
| String, | ||
| Regex, | ||
| /// Given valid Swift code, then this variant should never be encountered. | ||
| /// If is is encountered, then check if an issue has already been submitted, | ||
| /// otherwise please [submit an issue]. | ||
| /// | ||
| /// [submit an issue]: https://github.com/vallentin/colorblast/issues | ||
| Unknown, | ||
| } | ||
|
|
||
| impl ScanToken for SwiftToken { | ||
| fn scan_token<'text>(scanner: &mut Scanner<'text>) -> Option<(Self, TokenSpan<'text>)> { | ||
| let (r, _s) = scanner.skip_whitespace(); | ||
| if !r.is_empty() { | ||
| return Some((Self::Space, scanner.span(r))); | ||
| } | ||
|
|
||
| if let Ok((r, _s)) = scanner.scan_swift_line_comment() { | ||
| return Some((Self::LineComment, scanner.span(r))); | ||
| } else if let Ok((r, _s)) = scanner.scan_swift_block_comment() { | ||
| return Some((Self::BlockComment, scanner.span(r))); | ||
| } | ||
|
|
||
| if let Ok((r, ident)) = scanner.scan_swift_identifier() { | ||
| let tok = match ident { | ||
| _ if ident.is_swift_nil_literal() => Self::Nil, | ||
| _ if ident.is_swift_boolean_literal() => Self::Boolean, | ||
| _ if ident.is_swift_keyword() => Self::Keyword, | ||
| _ => Self::Ident, | ||
| }; | ||
| return Some((tok, scanner.span(r))); | ||
| } else if let Ok((r, _c)) = scanner.scan_swift_attribute_name() { | ||
| return Some((Self::AttribName, scanner.span(r))); | ||
| } | ||
|
|
||
| if let Ok((r, f)) = scanner.scan_swift_float_literal() { | ||
| let tok = if f.contains('.') { | ||
| Self::Float | ||
| } else { | ||
| Self::Int | ||
| }; | ||
| return Some((tok, scanner.span(r))); | ||
| } else if let Ok((r, _s)) = scanner.scan_swift_int_literal() { | ||
| return Some((Self::Int, scanner.span(r))); | ||
| } | ||
|
|
||
| if let Ok((r, _s)) = scanner.scan_swift_string_literal() { | ||
| return Some((Self::String, scanner.span(r))); | ||
| } else if let Ok((r, _c)) = scanner.scan_swift_regex_literal() { | ||
| return Some((Self::Regex, scanner.span(r))); | ||
| } | ||
|
|
||
| if let Ok((r, _c)) = scanner.scan_swift_operator() { | ||
| return Some((Self::Punct, scanner.span(r))); | ||
| } else if let Ok((r, _c)) = scanner.scan_swift_delimiter() { | ||
| return Some((Self::Delim, scanner.span(r))); | ||
| } | ||
|
|
||
| let (r, _c) = scanner.next().ok()?; | ||
| Some((Self::Unknown, scanner.span(r))) | ||
| } | ||
| } | ||
|
|
||
| /// Swift lexer producing [`SwiftToken`]s. | ||
| /// | ||
| /// **Note:** Cloning `SwiftLexer` is essentially a copy, as it just contains | ||
| /// a `&str` and a `usize` for its `cursor`. However, `Copy` is not | ||
| /// implemented, to avoid accidentally copying immutable `SwiftLexer`s. | ||
| #[derive(Clone, Debug)] | ||
| pub struct SwiftLexer<'text> { | ||
| scanner: Scanner<'text>, | ||
| } | ||
|
|
||
| impl<'text> SwiftLexer<'text> { | ||
| #[inline] | ||
| pub fn new(text: &'text str) -> Self { | ||
| Self { | ||
| scanner: Scanner::new(text), | ||
| } | ||
| } | ||
| } | ||
|
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| impl_lexer_from_scanner!('text, SwiftLexer<'text>, SwiftToken, scanner); | ||
|
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| #[cfg(test)] | ||
| mod tests { | ||
| use super::*; | ||
|
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| #[test] | ||
| fn test_swift_lexer_spans() { | ||
| // This intentionally uses Rust code as input, as it is | ||
| // only testing that SwiftLexer returns all characters | ||
| let input = include_str!("../../../text-scanner/src/ext/rust.rs"); | ||
| let mut output = String::new(); | ||
|
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| let lexer = SwiftLexer::new(input); | ||
| for (_tok, span) in lexer { | ||
| output.push_str(span.as_str()); | ||
| } | ||
|
|
||
| assert_eq!(input, output); | ||
| } | ||
| } |
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