Examples #433
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Examples #433
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June 1, 2016 16:19
kevinbarabash
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Dec 24, 2021
* ## Unicode support This PR adds support for Unicode codepoints at the syntax level: ReScript source code is now unicode text encoded in UTF-8. Fixes rescript-lang/syntax#397 ### Codepoint literals A codepoint literal represents an integer value identifying a unicode code point. It is expressed as one or more characters enclosed in single quotes. Examples are `’x’`, `’\n’` or `\u{00A9}`. Multiple UTF-8-encoded bytes may represent a single integer value. ### String literals String literals are (possibly multi-byte) UTF-8 encoded character sequences between double quotes, as in `"fox"`. ### New escape sequences Both codepoint and string literals accept the following new escape sequences: 1) Unicode escape sequences Any character with a character code lower than 65536 can be escaped using the hexadecimal value of its character code, prefixed with `\u`. Unicode escapes are six characters long. They require exactly four characters following `\u` . If the hexadecimal character code is only one, two or three characters long, you’ll need to pad it with leading zeroes. Example: `'\u2665'` (Represents ♥) 2) Unicode codepoint escape sequences Any code point or character can be escaped using the hexadecimal value of its character code, prefixed with `\u{` and suffixed with `}` . This allows for code points up to 0x10FFFF, which is the highest code point defined by Unicode. Unicode code point escapes consist of at least five characters. At least one hexadecimal character can be wrapped in `\u{…}` . There is no upper limit on the number of hex digits in use (for example '\u{000000000061}' == 'a') Example: `'\u{2318}'` (Represents ⌘) * Rename Character token to Codepoint token. Codepoint makes more sense with unicode * Add comment about codepoint literal encoding for printer. * Parse all normal strings as {js||js} strings. The compiler processes these strings with js semantics. Previously {js||js} where interpreted as template literal strings. The internal encoding has been changed to use an attribute (@res.template) to detect template literal strings
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