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Diffstat (limited to 'vanilla/node_modules/css-tree/cjs/lexer/generic-urange.cjs')
| -rw-r--r-- | vanilla/node_modules/css-tree/cjs/lexer/generic-urange.cjs | 149 |
1 files changed, 0 insertions, 149 deletions
diff --git a/vanilla/node_modules/css-tree/cjs/lexer/generic-urange.cjs b/vanilla/node_modules/css-tree/cjs/lexer/generic-urange.cjs deleted file mode 100644 index ce167bb..0000000 --- a/vanilla/node_modules/css-tree/cjs/lexer/generic-urange.cjs +++ /dev/null @@ -1,149 +0,0 @@ -'use strict'; - -const charCodeDefinitions = require('../tokenizer/char-code-definitions.cjs'); -const types = require('../tokenizer/types.cjs'); -const utils = require('../tokenizer/utils.cjs'); - -const PLUSSIGN = 0x002B; // U+002B PLUS SIGN (+) -const HYPHENMINUS = 0x002D; // U+002D HYPHEN-MINUS (-) -const QUESTIONMARK = 0x003F; // U+003F QUESTION MARK (?) -const U = 0x0075; // U+0075 LATIN SMALL LETTER U (u) - -function isDelim(token, code) { - return token !== null && token.type === types.Delim && token.value.charCodeAt(0) === code; -} - -function startsWith(token, code) { - return token.value.charCodeAt(0) === code; -} - -function hexSequence(token, offset, allowDash) { - let hexlen = 0; - - for (let pos = offset; pos < token.value.length; pos++) { - const code = token.value.charCodeAt(pos); - - if (code === HYPHENMINUS && allowDash && hexlen !== 0) { - hexSequence(token, offset + hexlen + 1, false); - return 6; // dissallow following question marks - } - - if (!charCodeDefinitions.isHexDigit(code)) { - return 0; // not a hex digit - } - - if (++hexlen > 6) { - return 0; // too many hex digits - } } - - return hexlen; -} - -function withQuestionMarkSequence(consumed, length, getNextToken) { - if (!consumed) { - return 0; // nothing consumed - } - - while (isDelim(getNextToken(length), QUESTIONMARK)) { - if (++consumed > 6) { - return 0; // too many question marks - } - - length++; - } - - return length; -} - -// https://drafts.csswg.org/css-syntax/#urange -// Informally, the <urange> production has three forms: -// U+0001 -// Defines a range consisting of a single code point, in this case the code point "1". -// U+0001-00ff -// Defines a range of codepoints between the first and the second value, in this case -// the range between "1" and "ff" (255 in decimal) inclusive. -// U+00?? -// Defines a range of codepoints where the "?" characters range over all hex digits, -// in this case defining the same as the value U+0000-00ff. -// In each form, a maximum of 6 digits is allowed for each hexadecimal number (if you treat "?" as a hexadecimal digit). -// -// <urange> = -// u '+' <ident-token> '?'* | -// u <dimension-token> '?'* | -// u <number-token> '?'* | -// u <number-token> <dimension-token> | -// u <number-token> <number-token> | -// u '+' '?'+ -function urange(token, getNextToken) { - let length = 0; - - // should start with `u` or `U` - if (token === null || token.type !== types.Ident || !utils.cmpChar(token.value, 0, U)) { - return 0; - } - - token = getNextToken(++length); - if (token === null) { - return 0; - } - - // u '+' <ident-token> '?'* - // u '+' '?'+ - if (isDelim(token, PLUSSIGN)) { - token = getNextToken(++length); - if (token === null) { - return 0; - } - - if (token.type === types.Ident) { - // u '+' <ident-token> '?'* - return withQuestionMarkSequence(hexSequence(token, 0, true), ++length, getNextToken); - } - - if (isDelim(token, QUESTIONMARK)) { - // u '+' '?'+ - return withQuestionMarkSequence(1, ++length, getNextToken); - } - - // Hex digit or question mark is expected - return 0; - } - - // u <number-token> '?'* - // u <number-token> <dimension-token> - // u <number-token> <number-token> - if (token.type === types.Number) { - const consumedHexLength = hexSequence(token, 1, true); - if (consumedHexLength === 0) { - return 0; - } - - token = getNextToken(++length); - if (token === null) { - // u <number-token> <eof> - return length; - } - - if (token.type === types.Dimension || token.type === types.Number) { - // u <number-token> <dimension-token> - // u <number-token> <number-token> - if (!startsWith(token, HYPHENMINUS) || !hexSequence(token, 1, false)) { - return 0; - } - - return length + 1; - } - - // u <number-token> '?'* - return withQuestionMarkSequence(consumedHexLength, length, getNextToken); - } - - // u <dimension-token> '?'* - if (token.type === types.Dimension) { - return withQuestionMarkSequence(hexSequence(token, 1, true), ++length, getNextToken); - } - - return 0; -} - -module.exports = urange; |
