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395ee0b79f
The idea here is to make a reusable library out of the existing rust-lexer, by separating out pure lexing and rustc-specific concerns, like spans, error reporting an interning. So, rustc_lexer operates directly on `&str`, produces simple tokens which are a pair of type-tag and a bit of original text, and does not report errors, instead storing them as flags on the token.
387 lines
15 KiB
Rust
387 lines
15 KiB
Rust
// Characters and their corresponding confusables were collected from
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// http://www.unicode.org/Public/security/10.0.0/confusables.txt
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use super::StringReader;
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use errors::{Applicability, DiagnosticBuilder};
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use syntax_pos::{BytePos, Pos, Span, NO_EXPANSION};
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#[rustfmt::skip] // for line breaks
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const UNICODE_ARRAY: &[(char, &str, char)] = &[
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('
', "Line Separator", ' '),
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('
', "Paragraph Separator", ' '),
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(' ', "Ogham Space mark", ' '),
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(' ', "En Quad", ' '),
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(' ', "Em Quad", ' '),
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(' ', "En Space", ' '),
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(' ', "Em Space", ' '),
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(' ', "Three-Per-Em Space", ' '),
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(' ', "Four-Per-Em Space", ' '),
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(' ', "Six-Per-Em Space", ' '),
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(' ', "Punctuation Space", ' '),
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(' ', "Thin Space", ' '),
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(' ', "Hair Space", ' '),
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(' ', "Medium Mathematical Space", ' '),
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(' ', "No-Break Space", ' '),
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(' ', "Figure Space", ' '),
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(' ', "Narrow No-Break Space", ' '),
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(' ', "Ideographic Space", ' '),
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('ߺ', "Nko Lajanyalan", '_'),
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('﹍', "Dashed Low Line", '_'),
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('﹎', "Centreline Low Line", '_'),
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('﹏', "Wavy Low Line", '_'),
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('＿', "Fullwidth Low Line", '_'),
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('‐', "Hyphen", '-'),
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('‑', "Non-Breaking Hyphen", '-'),
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('‒', "Figure Dash", '-'),
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('–', "En Dash", '-'),
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('—', "Em Dash", '-'),
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('﹘', "Small Em Dash", '-'),
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('۔', "Arabic Full Stop", '-'),
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('⁃', "Hyphen Bullet", '-'),
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('˗', "Modifier Letter Minus Sign", '-'),
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('−', "Minus Sign", '-'),
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('➖', "Heavy Minus Sign", '-'),
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('Ⲻ', "Coptic Letter Dialect-P Ni", '-'),
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('ー', "Katakana-Hiragana Prolonged Sound Mark", '-'),
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('－', "Fullwidth Hyphen-Minus", '-'),
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('―', "Horizontal Bar", '-'),
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('─', "Box Drawings Light Horizontal", '-'),
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('━', "Box Drawings Heavy Horizontal", '-'),
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('㇐', "CJK Stroke H", '-'),
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('ꟷ', "Latin Epigraphic Letter Dideways", '-'),
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('ᅳ', "Hangul Jungseong Eu", '-'),
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('ㅡ', "Hangul Letter Eu", '-'),
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('一', "CJK Unified Ideograph-4E00", '-'),
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('⼀', "Kangxi Radical One", '-'),
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('؍', "Arabic Date Separator", ','),
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('٫', "Arabic Decimal Separator", ','),
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('‚', "Single Low-9 Quotation Mark", ','),
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('¸', "Cedilla", ','),
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('ꓹ', "Lisu Letter Tone Na Po", ','),
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('，', "Fullwidth Comma", ','),
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(';', "Greek Question Mark", ';'),
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('；', "Fullwidth Semicolon", ';'),
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('︔', "Presentation Form For Vertical Semicolon", ';'),
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('ः', "Devanagari Sign Visarga", ':'),
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('ઃ', "Gujarati Sign Visarga", ':'),
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('：', "Fullwidth Colon", ':'),
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('։', "Armenian Full Stop", ':'),
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('܃', "Syriac Supralinear Colon", ':'),
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('܄', "Syriac Sublinear Colon", ':'),
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('᛬', "Runic Multiple Punctuation", ':'),
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('︰', "Presentation Form For Vertical Two Dot Leader", ':'),
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('᠃', "Mongolian Full Stop", ':'),
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('᠉', "Mongolian Manchu Full Stop", ':'),
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('⁚', "Two Dot Punctuation", ':'),
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('׃', "Hebrew Punctuation Sof Pasuq", ':'),
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('˸', "Modifier Letter Raised Colon", ':'),
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('꞉', "Modifier Letter Colon", ':'),
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('∶', "Ratio", ':'),
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('ː', "Modifier Letter Triangular Colon", ':'),
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('ꓽ', "Lisu Letter Tone Mya Jeu", ':'),
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('︓', "Presentation Form For Vertical Colon", ':'),
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('！', "Fullwidth Exclamation Mark", '!'),
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('ǃ', "Latin Letter Retroflex Click", '!'),
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('ⵑ', "Tifinagh Letter Tuareg Yang", '!'),
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('︕', "Presentation Form For Vertical Exclamation Mark", '!'),
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('ʔ', "Latin Letter Glottal Stop", '?'),
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('Ɂ', "Latin Capital Letter Glottal Stop", '?'),
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('ॽ', "Devanagari Letter Glottal Stop", '?'),
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('Ꭾ', "Cherokee Letter He", '?'),
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('ꛫ', "Bamum Letter Ntuu", '?'),
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('？', "Fullwidth Question Mark", '?'),
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('︖', "Presentation Form For Vertical Question Mark", '?'),
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('𝅭', "Musical Symbol Combining Augmentation Dot", '.'),
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('․', "One Dot Leader", '.'),
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('܁', "Syriac Supralinear Full Stop", '.'),
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('܂', "Syriac Sublinear Full Stop", '.'),
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('꘎', "Vai Full Stop", '.'),
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('𐩐', "Kharoshthi Punctuation Dot", '.'),
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('٠', "Arabic-Indic Digit Zero", '.'),
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('۰', "Extended Arabic-Indic Digit Zero", '.'),
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('ꓸ', "Lisu Letter Tone Mya Ti", '.'),
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('·', "Middle Dot", '.'),
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('・', "Katakana Middle Dot", '.'),
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('･', "Halfwidth Katakana Middle Dot", '.'),
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('᛫', "Runic Single Punctuation", '.'),
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('·', "Greek Ano Teleia", '.'),
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('⸱', "Word Separator Middle Dot", '.'),
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('𐄁', "Aegean Word Separator Dot", '.'),
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('•', "Bullet", '.'),
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('‧', "Hyphenation Point", '.'),
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('∙', "Bullet Operator", '.'),
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('⋅', "Dot Operator", '.'),
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('ꞏ', "Latin Letter Sinological Dot", '.'),
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('ᐧ', "Canadian Syllabics Final Middle Dot", '.'),
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('ᐧ', "Canadian Syllabics Final Middle Dot", '.'),
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('．', "Fullwidth Full Stop", '.'),
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('。', "Ideographic Full Stop", '.'),
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('︒', "Presentation Form For Vertical Ideographic Full Stop", '.'),
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('՝', "Armenian Comma", '\''),
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('＇', "Fullwidth Apostrophe", '\''),
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('‘', "Left Single Quotation Mark", '\''),
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('’', "Right Single Quotation Mark", '\''),
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('‛', "Single High-Reversed-9 Quotation Mark", '\''),
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('′', "Prime", '\''),
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('‵', "Reversed Prime", '\''),
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('՚', "Armenian Apostrophe", '\''),
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('׳', "Hebrew Punctuation Geresh", '\''),
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('`', "Grave Accent", '\''),
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('`', "Greek Varia", '\''),
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('｀', "Fullwidth Grave Accent", '\''),
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('´', "Acute Accent", '\''),
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('΄', "Greek Tonos", '\''),
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('´', "Greek Oxia", '\''),
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('᾽', "Greek Koronis", '\''),
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('᾿', "Greek Psili", '\''),
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('῾', "Greek Dasia", '\''),
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('ʹ', "Modifier Letter Prime", '\''),
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('ʹ', "Greek Numeral Sign", '\''),
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('ˈ', "Modifier Letter Vertical Line", '\''),
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('ˊ', "Modifier Letter Acute Accent", '\''),
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('ˋ', "Modifier Letter Grave Accent", '\''),
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('˴', "Modifier Letter Middle Grave Accent", '\''),
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('ʻ', "Modifier Letter Turned Comma", '\''),
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('ʽ', "Modifier Letter Reversed Comma", '\''),
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('ʼ', "Modifier Letter Apostrophe", '\''),
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('ʾ', "Modifier Letter Right Half Ring", '\''),
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('ꞌ', "Latin Small Letter Saltillo", '\''),
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('י', "Hebrew Letter Yod", '\''),
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('ߴ', "Nko High Tone Apostrophe", '\''),
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('ߵ', "Nko Low Tone Apostrophe", '\''),
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('ᑊ', "Canadian Syllabics West-Cree P", '\''),
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('ᛌ', "Runic Letter Short-Twig-Sol S", '\''),
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('𖽑', "Miao Sign Aspiration", '\''),
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('𖽒', "Miao Sign Reformed Voicing", '\''),
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('᳓', "Vedic Sign Nihshvasa", '"'),
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('＂', "Fullwidth Quotation Mark", '"'),
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('“', "Left Double Quotation Mark", '"'),
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('”', "Right Double Quotation Mark", '"'),
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('‟', "Double High-Reversed-9 Quotation Mark", '"'),
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('″', "Double Prime", '"'),
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('‶', "Reversed Double Prime", '"'),
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('〃', "Ditto Mark", '"'),
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('״', "Hebrew Punctuation Gershayim", '"'),
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('˝', "Double Acute Accent", '"'),
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('ʺ', "Modifier Letter Double Prime", '"'),
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('˶', "Modifier Letter Middle Double Acute Accent", '"'),
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('˵', "Modifier Letter Middle Double Grave Accent", '"'),
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('ˮ', "Modifier Letter Double Apostrophe", '"'),
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('ײ', "Hebrew Ligature Yiddish Double Yod", '"'),
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('❞', "Heavy Double Comma Quotation Mark Ornament", '"'),
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('❝', "Heavy Double Turned Comma Quotation Mark Ornament", '"'),
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('（', "Fullwidth Left Parenthesis", '('),
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('❨', "Medium Left Parenthesis Ornament", '('),
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('﴾', "Ornate Left Parenthesis", '('),
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('）', "Fullwidth Right Parenthesis", ')'),
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('❩', "Medium Right Parenthesis Ornament", ')'),
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('﴿', "Ornate Right Parenthesis", ')'),
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('［', "Fullwidth Left Square Bracket", '['),
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('❲', "Light Left Tortoise Shell Bracket Ornament", '['),
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('「', "Left Corner Bracket", '['),
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('『', "Left White Corner Bracket", '['),
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('【', "Left Black Lenticular Bracket", '['),
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('〔', "Left Tortoise Shell Bracket", '['),
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('〖', "Left White Lenticular Bracket", '['),
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('〘', "Left White Tortoise Shell Bracket", '['),
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('〚', "Left White Square Bracket", '['),
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('］', "Fullwidth Right Square Bracket", ']'),
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('❳', "Light Right Tortoise Shell Bracket Ornament", ']'),
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('」', "Right Corner Bracket", ']'),
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('』', "Right White Corner Bracket", ']'),
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('】', "Right Black Lenticular Bracket", ']'),
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('〕', "Right Tortoise Shell Bracket", ']'),
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('〗', "Right White Lenticular Bracket", ']'),
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('〙', "Right White Tortoise Shell Bracket", ']'),
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('〛', "Right White Square Bracket", ']'),
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('❴', "Medium Left Curly Bracket Ornament", '{'),
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('𝄔', "Musical Symbol Brace", '{'),
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('｛', "Fullwidth Left Curly Bracket", '{'),
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('❵', "Medium Right Curly Bracket Ornament", '}'),
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('｝', "Fullwidth Right Curly Bracket", '}'),
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('⁎', "Low Asterisk", '*'),
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('٭', "Arabic Five Pointed Star", '*'),
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('∗', "Asterisk Operator", '*'),
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('𐌟', "Old Italic Letter Ess", '*'),
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('＊', "Fullwidth Asterisk", '*'),
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('᜵', "Philippine Single Punctuation", '/'),
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('⁁', "Caret Insertion Point", '/'),
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('∕', "Division Slash", '/'),
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('⁄', "Fraction Slash", '/'),
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('╱', "Box Drawings Light Diagonal Upper Right To Lower Left", '/'),
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('⟋', "Mathematical Rising Diagonal", '/'),
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('⧸', "Big Solidus", '/'),
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('𝈺', "Greek Instrumental Notation Symbol-47", '/'),
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('㇓', "CJK Stroke Sp", '/'),
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('〳', "Vertical Kana Repeat Mark Upper Half", '/'),
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('Ⳇ', "Coptic Capital Letter Old Coptic Esh", '/'),
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('ノ', "Katakana Letter No", '/'),
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('丿', "CJK Unified Ideograph-4E3F", '/'),
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('⼃', "Kangxi Radical Slash", '/'),
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('／', "Fullwidth Solidus", '/'),
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('＼', "Fullwidth Reverse Solidus", '\\'),
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('﹨', "Small Reverse Solidus", '\\'),
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('∖', "Set Minus", '\\'),
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('⟍', "Mathematical Falling Diagonal", '\\'),
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('⧵', "Reverse Solidus Operator", '\\'),
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('⧹', "Big Reverse Solidus", '\\'),
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('⧹', "Greek Vocal Notation Symbol-16", '\\'),
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('⧹', "Greek Instrumental Symbol-48", '\\'),
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('㇔', "CJK Stroke D", '\\'),
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('丶', "CJK Unified Ideograph-4E36", '\\'),
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('⼂', "Kangxi Radical Dot", '\\'),
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('、', "Ideographic Comma", '\\'),
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('ヽ', "Katakana Iteration Mark", '\\'),
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('ꝸ', "Latin Small Letter Um", '&'),
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('＆', "Fullwidth Ampersand", '&'),
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('᛭', "Runic Cross Punctuation", '+'),
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('➕', "Heavy Plus Sign", '+'),
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('𐊛', "Lycian Letter H", '+'),
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('﬩', "Hebrew Letter Alternative Plus Sign", '+'),
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('＋', "Fullwidth Plus Sign", '+'),
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('‹', "Single Left-Pointing Angle Quotation Mark", '<'),
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('❮', "Heavy Left-Pointing Angle Quotation Mark Ornament", '<'),
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('˂', "Modifier Letter Left Arrowhead", '<'),
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('𝈶', "Greek Instrumental Symbol-40", '<'),
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('ᐸ', "Canadian Syllabics Pa", '<'),
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('ᚲ', "Runic Letter Kauna", '<'),
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('❬', "Medium Left-Pointing Angle Bracket Ornament", '<'),
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('⟨', "Mathematical Left Angle Bracket", '<'),
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('〈', "Left-Pointing Angle Bracket", '<'),
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('〈', "Left Angle Bracket", '<'),
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('㇛', "CJK Stroke Pd", '<'),
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('く', "Hiragana Letter Ku", '<'),
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('𡿨', "CJK Unified Ideograph-21FE8", '<'),
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('《', "Left Double Angle Bracket", '<'),
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('＜', "Fullwidth Less-Than Sign", '<'),
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('᐀', "Canadian Syllabics Hyphen", '='),
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('⹀', "Double Hyphen", '='),
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('゠', "Katakana-Hiragana Double Hyphen", '='),
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('꓿', "Lisu Punctuation Full Stop", '='),
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('＝', "Fullwidth Equals Sign", '='),
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('›', "Single Right-Pointing Angle Quotation Mark", '>'),
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('❯', "Heavy Right-Pointing Angle Quotation Mark Ornament", '>'),
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('˃', "Modifier Letter Right Arrowhead", '>'),
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('𝈷', "Greek Instrumental Symbol-42", '>'),
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('ᐳ', "Canadian Syllabics Po", '>'),
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('𖼿', "Miao Letter Archaic Zza", '>'),
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('❭', "Medium Right-Pointing Angle Bracket Ornament", '>'),
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('⟩', "Mathematical Right Angle Bracket", '>'),
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('〉', "Right-Pointing Angle Bracket", '>'),
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('〉', "Right Angle Bracket", '>'),
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('》', "Right Double Angle Bracket", '>'),
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('＞', "Fullwidth Greater-Than Sign", '>'),
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];
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const ASCII_ARRAY: &[(char, &str)] = &[
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(' ', "Space"),
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('_', "Underscore"),
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('-', "Minus/Hyphen"),
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(',', "Comma"),
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(';', "Semicolon"),
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(':', "Colon"),
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('!', "Exclamation Mark"),
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('?', "Question Mark"),
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('.', "Period"),
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('\'', "Single Quote"),
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('"', "Quotation Mark"),
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('(', "Left Parenthesis"),
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(')', "Right Parenthesis"),
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('[', "Left Square Bracket"),
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(']', "Right Square Bracket"),
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('{', "Left Curly Brace"),
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('}', "Right Curly Brace"),
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('*', "Asterisk"),
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('/', "Slash"),
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('\\', "Backslash"),
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('&', "Ampersand"),
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('+', "Plus Sign"),
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('<', "Less-Than Sign"),
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('=', "Equals Sign"),
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('>', "Greater-Than Sign"),
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];
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crate fn check_for_substitution<'a>(
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reader: &StringReader<'a>,
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pos: BytePos,
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ch: char,
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err: &mut DiagnosticBuilder<'a>,
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) -> bool {
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let (u_name, ascii_char) = match UNICODE_ARRAY.iter().find(|&&(c, _, _)| c == ch) {
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Some(&(_u_char, u_name, ascii_char)) => (u_name, ascii_char),
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None => return false,
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};
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let span = Span::new(pos, pos + Pos::from_usize(ch.len_utf8()), NO_EXPANSION);
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let ascii_name = match ASCII_ARRAY.iter().find(|&&(c, _)| c == ascii_char) {
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Some((_ascii_char, ascii_name)) => ascii_name,
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None => {
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let msg = format!("substitution character not found for '{}'", ch);
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reader.sess.span_diagnostic.span_bug_no_panic(span, &msg);
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return false;
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}
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};
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// special help suggestion for "directed" double quotes
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if let Some(s) = peek_delimited(&reader.src[reader.src_index(pos)..], '“', '”') {
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let msg = format!(
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"Unicode characters '“' (Left Double Quotation Mark) and \
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'”' (Right Double Quotation Mark) look like '{}' ({}), but are not",
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ascii_char, ascii_name
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);
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err.span_suggestion(
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Span::new(
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pos,
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pos + Pos::from_usize('“'.len_utf8() + s.len() + '”'.len_utf8()),
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NO_EXPANSION,
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),
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&msg,
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format!("\"{}\"", s),
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Applicability::MaybeIncorrect,
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);
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} else {
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let msg = format!(
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"Unicode character '{}' ({}) looks like '{}' ({}), but it is not",
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ch, u_name, ascii_char, ascii_name
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);
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err.span_suggestion(span, &msg, ascii_char.to_string(), Applicability::MaybeIncorrect);
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}
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true
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}
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/// Extract string if found at current position with given delimiters
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fn peek_delimited(text: &str, from_ch: char, to_ch: char) -> Option<&str> {
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let mut chars = text.chars();
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let first_char = chars.next()?;
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if first_char != from_ch {
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return None;
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}
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let last_char_idx = chars.as_str().find(to_ch)?;
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Some(&chars.as_str()[..last_char_idx])
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}
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