555 lines
23 KiB
JavaScript
555 lines
23 KiB
JavaScript
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'use strict';
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const types = require('./types.cjs');
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const charCodeDefinitions = require('./char-code-definitions.cjs');
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const utils = require('./utils.cjs');
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const names = require('./names.cjs');
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const OffsetToLocation = require('./OffsetToLocation.cjs');
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const TokenStream = require('./TokenStream.cjs');
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function tokenize(source, onToken) {
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function getCharCode(offset) {
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return offset < sourceLength ? source.charCodeAt(offset) : 0;
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}
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// § 4.3.3. Consume a numeric token
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function consumeNumericToken() {
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// Consume a number and let number be the result.
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offset = utils.consumeNumber(source, offset);
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// If the next 3 input code points would start an identifier, then:
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if (charCodeDefinitions.isIdentifierStart(getCharCode(offset), getCharCode(offset + 1), getCharCode(offset + 2))) {
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// Create a <dimension-token> with the same value and type flag as number, and a unit set initially to the empty string.
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// Consume a name. Set the <dimension-token>’s unit to the returned value.
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// Return the <dimension-token>.
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type = types.Dimension;
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offset = utils.consumeName(source, offset);
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return;
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}
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// Otherwise, if the next input code point is U+0025 PERCENTAGE SIGN (%), consume it.
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if (getCharCode(offset) === 0x0025) {
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// Create a <percentage-token> with the same value as number, and return it.
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type = types.Percentage;
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offset++;
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return;
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}
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// Otherwise, create a <number-token> with the same value and type flag as number, and return it.
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type = types.Number;
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}
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// § 4.3.4. Consume an ident-like token
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function consumeIdentLikeToken() {
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const nameStartOffset = offset;
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// Consume a name, and let string be the result.
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offset = utils.consumeName(source, offset);
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// If string’s value is an ASCII case-insensitive match for "url",
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// and the next input code point is U+0028 LEFT PARENTHESIS ((), consume it.
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if (utils.cmpStr(source, nameStartOffset, offset, 'url') && getCharCode(offset) === 0x0028) {
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// While the next two input code points are whitespace, consume the next input code point.
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offset = utils.findWhiteSpaceEnd(source, offset + 1);
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// If the next one or two input code points are U+0022 QUOTATION MARK ("), U+0027 APOSTROPHE ('),
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// or whitespace followed by U+0022 QUOTATION MARK (") or U+0027 APOSTROPHE ('),
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// then create a <function-token> with its value set to string and return it.
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if (getCharCode(offset) === 0x0022 ||
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getCharCode(offset) === 0x0027) {
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type = types.Function;
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offset = nameStartOffset + 4;
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return;
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}
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// Otherwise, consume a url token, and return it.
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consumeUrlToken();
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return;
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}
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// Otherwise, if the next input code point is U+0028 LEFT PARENTHESIS ((), consume it.
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// Create a <function-token> with its value set to string and return it.
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if (getCharCode(offset) === 0x0028) {
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type = types.Function;
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offset++;
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return;
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}
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// Otherwise, create an <ident-token> with its value set to string and return it.
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type = types.Ident;
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}
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// § 4.3.5. Consume a string token
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function consumeStringToken(endingCodePoint) {
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// This algorithm may be called with an ending code point, which denotes the code point
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// that ends the string. If an ending code point is not specified,
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// the current input code point is used.
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if (!endingCodePoint) {
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endingCodePoint = getCharCode(offset++);
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}
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// Initially create a <string-token> with its value set to the empty string.
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type = types.String;
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// Repeatedly consume the next input code point from the stream:
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for (; offset < source.length; offset++) {
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const code = source.charCodeAt(offset);
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switch (charCodeDefinitions.charCodeCategory(code)) {
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// ending code point
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case endingCodePoint:
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// Return the <string-token>.
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offset++;
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return;
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// EOF
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// case EofCategory:
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// This is a parse error. Return the <string-token>.
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// return;
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// newline
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case charCodeDefinitions.WhiteSpaceCategory:
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if (charCodeDefinitions.isNewline(code)) {
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// This is a parse error. Reconsume the current input code point,
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// create a <bad-string-token>, and return it.
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offset += utils.getNewlineLength(source, offset, code);
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type = types.BadString;
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return;
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}
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break;
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// U+005C REVERSE SOLIDUS (\)
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case 0x005C:
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// If the next input code point is EOF, do nothing.
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if (offset === source.length - 1) {
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break;
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}
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const nextCode = getCharCode(offset + 1);
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// Otherwise, if the next input code point is a newline, consume it.
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if (charCodeDefinitions.isNewline(nextCode)) {
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offset += utils.getNewlineLength(source, offset + 1, nextCode);
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} else if (charCodeDefinitions.isValidEscape(code, nextCode)) {
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// Otherwise, (the stream starts with a valid escape) consume
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// an escaped code point and append the returned code point to
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// the <string-token>’s value.
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offset = utils.consumeEscaped(source, offset) - 1;
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}
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break;
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// anything else
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// Append the current input code point to the <string-token>’s value.
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}
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}
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}
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// § 4.3.6. Consume a url token
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// Note: This algorithm assumes that the initial "url(" has already been consumed.
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// This algorithm also assumes that it’s being called to consume an "unquoted" value, like url(foo).
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// A quoted value, like url("foo"), is parsed as a <function-token>. Consume an ident-like token
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// automatically handles this distinction; this algorithm shouldn’t be called directly otherwise.
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function consumeUrlToken() {
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// Initially create a <url-token> with its value set to the empty string.
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type = types.Url;
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// Consume as much whitespace as possible.
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offset = utils.findWhiteSpaceEnd(source, offset);
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// Repeatedly consume the next input code point from the stream:
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for (; offset < source.length; offset++) {
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const code = source.charCodeAt(offset);
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switch (charCodeDefinitions.charCodeCategory(code)) {
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// U+0029 RIGHT PARENTHESIS ())
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case 0x0029:
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// Return the <url-token>.
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offset++;
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return;
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// EOF
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// case EofCategory:
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// This is a parse error. Return the <url-token>.
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// return;
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// whitespace
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case charCodeDefinitions.WhiteSpaceCategory:
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// Consume as much whitespace as possible.
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offset = utils.findWhiteSpaceEnd(source, offset);
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// If the next input code point is U+0029 RIGHT PARENTHESIS ()) or EOF,
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// consume it and return the <url-token>
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// (if EOF was encountered, this is a parse error);
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if (getCharCode(offset) === 0x0029 || offset >= source.length) {
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if (offset < source.length) {
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offset++;
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}
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return;
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}
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// otherwise, consume the remnants of a bad url, create a <bad-url-token>,
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// and return it.
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offset = utils.consumeBadUrlRemnants(source, offset);
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type = types.BadUrl;
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return;
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// U+0022 QUOTATION MARK (")
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// U+0027 APOSTROPHE (')
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// U+0028 LEFT PARENTHESIS (()
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// non-printable code point
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case 0x0022:
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case 0x0027:
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case 0x0028:
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case charCodeDefinitions.NonPrintableCategory:
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// This is a parse error. Consume the remnants of a bad url,
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// create a <bad-url-token>, and return it.
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offset = utils.consumeBadUrlRemnants(source, offset);
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type = types.BadUrl;
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return;
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// U+005C REVERSE SOLIDUS (\)
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case 0x005C:
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// If the stream starts with a valid escape, consume an escaped code point and
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// append the returned code point to the <url-token>’s value.
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if (charCodeDefinitions.isValidEscape(code, getCharCode(offset + 1))) {
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offset = utils.consumeEscaped(source, offset) - 1;
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break;
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}
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// Otherwise, this is a parse error. Consume the remnants of a bad url,
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// create a <bad-url-token>, and return it.
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offset = utils.consumeBadUrlRemnants(source, offset);
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type = types.BadUrl;
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return;
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// anything else
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// Append the current input code point to the <url-token>’s value.
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}
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}
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}
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// ensure source is a string
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source = String(source || '');
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const sourceLength = source.length;
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let start = charCodeDefinitions.isBOM(getCharCode(0));
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let offset = start;
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let type;
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// https://drafts.csswg.org/css-syntax-3/#consume-token
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// § 4.3.1. Consume a token
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while (offset < sourceLength) {
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const code = source.charCodeAt(offset);
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switch (charCodeDefinitions.charCodeCategory(code)) {
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// whitespace
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case charCodeDefinitions.WhiteSpaceCategory:
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// Consume as much whitespace as possible. Return a <whitespace-token>.
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type = types.WhiteSpace;
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offset = utils.findWhiteSpaceEnd(source, offset + 1);
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break;
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// U+0022 QUOTATION MARK (")
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case 0x0022:
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// Consume a string token and return it.
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consumeStringToken();
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break;
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// U+0023 NUMBER SIGN (#)
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case 0x0023:
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// If the next input code point is a name code point or the next two input code points are a valid escape, then:
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if (charCodeDefinitions.isName(getCharCode(offset + 1)) || charCodeDefinitions.isValidEscape(getCharCode(offset + 1), getCharCode(offset + 2))) {
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// Create a <hash-token>.
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type = types.Hash;
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// If the next 3 input code points would start an identifier, set the <hash-token>’s type flag to "id".
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// if (isIdentifierStart(getCharCode(offset + 1), getCharCode(offset + 2), getCharCode(offset + 3))) {
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// // TODO: set id flag
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// }
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// Consume a name, and set the <hash-token>’s value to the returned string.
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offset = utils.consumeName(source, offset + 1);
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// Return the <hash-token>.
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} else {
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// Otherwise, return a <delim-token> with its value set to the current input code point.
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type = types.Delim;
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offset++;
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}
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break;
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// U+0027 APOSTROPHE (')
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case 0x0027:
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// Consume a string token and return it.
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consumeStringToken();
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break;
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// U+0028 LEFT PARENTHESIS (()
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case 0x0028:
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// Return a <(-token>.
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type = types.LeftParenthesis;
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offset++;
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break;
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// U+0029 RIGHT PARENTHESIS ())
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case 0x0029:
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// Return a <)-token>.
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type = types.RightParenthesis;
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offset++;
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break;
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// U+002B PLUS SIGN (+)
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case 0x002B:
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// If the input stream starts with a number, ...
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if (charCodeDefinitions.isNumberStart(code, getCharCode(offset + 1), getCharCode(offset + 2))) {
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// ... reconsume the current input code point, consume a numeric token, and return it.
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consumeNumericToken();
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} else {
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// Otherwise, return a <delim-token> with its value set to the current input code point.
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type = types.Delim;
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offset++;
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}
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break;
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// U+002C COMMA (,)
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case 0x002C:
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// Return a <comma-token>.
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type = types.Comma;
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offset++;
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break;
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// U+002D HYPHEN-MINUS (-)
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case 0x002D:
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// If the input stream starts with a number, reconsume the current input code point, consume a numeric token, and return it.
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if (charCodeDefinitions.isNumberStart(code, getCharCode(offset + 1), getCharCode(offset + 2))) {
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consumeNumericToken();
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} else {
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// Otherwise, if the next 2 input code points are U+002D HYPHEN-MINUS U+003E GREATER-THAN SIGN (->), consume them and return a <CDC-token>.
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if (getCharCode(offset + 1) === 0x002D &&
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getCharCode(offset + 2) === 0x003E) {
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type = types.CDC;
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offset = offset + 3;
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} else {
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// Otherwise, if the input stream starts with an identifier, ...
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if (charCodeDefinitions.isIdentifierStart(code, getCharCode(offset + 1), getCharCode(offset + 2))) {
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// ... reconsume the current input code point, consume an ident-like token, and return it.
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consumeIdentLikeToken();
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} else {
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// Otherwise, return a <delim-token> with its value set to the current input code point.
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type = types.Delim;
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offset++;
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}
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}
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}
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break;
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// U+002E FULL STOP (.)
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case 0x002E:
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// If the input stream starts with a number, ...
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|
|
if (charCodeDefinitions.isNumberStart(code, getCharCode(offset + 1), getCharCode(offset + 2))) {
|
|||
|
|
// ... reconsume the current input code point, consume a numeric token, and return it.
|
|||
|
|
consumeNumericToken();
|
|||
|
|
} else {
|
|||
|
|
// Otherwise, return a <delim-token> with its value set to the current input code point.
|
|||
|
|
type = types.Delim;
|
|||
|
|
offset++;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
break;
|
|||
|
|
|
|||
|
|
// U+002F SOLIDUS (/)
|
|||
|
|
case 0x002F:
|
|||
|
|
// If the next two input code point are U+002F SOLIDUS (/) followed by a U+002A ASTERISK (*),
|
|||
|
|
if (getCharCode(offset + 1) === 0x002A) {
|
|||
|
|
// ... consume them and all following code points up to and including the first U+002A ASTERISK (*)
|
|||
|
|
// followed by a U+002F SOLIDUS (/), or up to an EOF code point.
|
|||
|
|
type = types.Comment;
|
|||
|
|
offset = source.indexOf('*/', offset + 2);
|
|||
|
|
offset = offset === -1 ? source.length : offset + 2;
|
|||
|
|
} else {
|
|||
|
|
type = types.Delim;
|
|||
|
|
offset++;
|
|||
|
|
}
|
|||
|
|
break;
|
|||
|
|
|
|||
|
|
// U+003A COLON (:)
|
|||
|
|
case 0x003A:
|
|||
|
|
// Return a <colon-token>.
|
|||
|
|
type = types.Colon;
|
|||
|
|
offset++;
|
|||
|
|
break;
|
|||
|
|
|
|||
|
|
// U+003B SEMICOLON (;)
|
|||
|
|
case 0x003B:
|
|||
|
|
// Return a <semicolon-token>.
|
|||
|
|
type = types.Semicolon;
|
|||
|
|
offset++;
|
|||
|
|
break;
|
|||
|
|
|
|||
|
|
// U+003C LESS-THAN SIGN (<)
|
|||
|
|
case 0x003C:
|
|||
|
|
// If the next 3 input code points are U+0021 EXCLAMATION MARK U+002D HYPHEN-MINUS U+002D HYPHEN-MINUS (!--), ...
|
|||
|
|
if (getCharCode(offset + 1) === 0x0021 &&
|
|||
|
|
getCharCode(offset + 2) === 0x002D &&
|
|||
|
|
getCharCode(offset + 3) === 0x002D) {
|
|||
|
|
// ... consume them and return a <CDO-token>.
|
|||
|
|
type = types.CDO;
|
|||
|
|
offset = offset + 4;
|
|||
|
|
} else {
|
|||
|
|
// Otherwise, return a <delim-token> with its value set to the current input code point.
|
|||
|
|
type = types.Delim;
|
|||
|
|
offset++;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
break;
|
|||
|
|
|
|||
|
|
// U+0040 COMMERCIAL AT (@)
|
|||
|
|
case 0x0040:
|
|||
|
|
// If the next 3 input code points would start an identifier, ...
|
|||
|
|
if (charCodeDefinitions.isIdentifierStart(getCharCode(offset + 1), getCharCode(offset + 2), getCharCode(offset + 3))) {
|
|||
|
|
// ... consume a name, create an <at-keyword-token> with its value set to the returned value, and return it.
|
|||
|
|
type = types.AtKeyword;
|
|||
|
|
offset = utils.consumeName(source, offset + 1);
|
|||
|
|
} else {
|
|||
|
|
// Otherwise, return a <delim-token> with its value set to the current input code point.
|
|||
|
|
type = types.Delim;
|
|||
|
|
offset++;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
break;
|
|||
|
|
|
|||
|
|
// U+005B LEFT SQUARE BRACKET ([)
|
|||
|
|
case 0x005B:
|
|||
|
|
// Return a <[-token>.
|
|||
|
|
type = types.LeftSquareBracket;
|
|||
|
|
offset++;
|
|||
|
|
break;
|
|||
|
|
|
|||
|
|
// U+005C REVERSE SOLIDUS (\)
|
|||
|
|
case 0x005C:
|
|||
|
|
// If the input stream starts with a valid escape, ...
|
|||
|
|
if (charCodeDefinitions.isValidEscape(code, getCharCode(offset + 1))) {
|
|||
|
|
// ... reconsume the current input code point, consume an ident-like token, and return it.
|
|||
|
|
consumeIdentLikeToken();
|
|||
|
|
} else {
|
|||
|
|
// Otherwise, this is a parse error. Return a <delim-token> with its value set to the current input code point.
|
|||
|
|
type = types.Delim;
|
|||
|
|
offset++;
|
|||
|
|
}
|
|||
|
|
break;
|
|||
|
|
|
|||
|
|
// U+005D RIGHT SQUARE BRACKET (])
|
|||
|
|
case 0x005D:
|
|||
|
|
// Return a <]-token>.
|
|||
|
|
type = types.RightSquareBracket;
|
|||
|
|
offset++;
|
|||
|
|
break;
|
|||
|
|
|
|||
|
|
// U+007B LEFT CURLY BRACKET ({)
|
|||
|
|
case 0x007B:
|
|||
|
|
// Return a <{-token>.
|
|||
|
|
type = types.LeftCurlyBracket;
|
|||
|
|
offset++;
|
|||
|
|
break;
|
|||
|
|
|
|||
|
|
// U+007D RIGHT CURLY BRACKET (})
|
|||
|
|
case 0x007D:
|
|||
|
|
// Return a <}-token>.
|
|||
|
|
type = types.RightCurlyBracket;
|
|||
|
|
offset++;
|
|||
|
|
break;
|
|||
|
|
|
|||
|
|
// digit
|
|||
|
|
case charCodeDefinitions.DigitCategory:
|
|||
|
|
// Reconsume the current input code point, consume a numeric token, and return it.
|
|||
|
|
consumeNumericToken();
|
|||
|
|
break;
|
|||
|
|
|
|||
|
|
// name-start code point
|
|||
|
|
case charCodeDefinitions.NameStartCategory:
|
|||
|
|
// Reconsume the current input code point, consume an ident-like token, and return it.
|
|||
|
|
consumeIdentLikeToken();
|
|||
|
|
break;
|
|||
|
|
|
|||
|
|
// EOF
|
|||
|
|
// case EofCategory:
|
|||
|
|
// Return an <EOF-token>.
|
|||
|
|
// break;
|
|||
|
|
|
|||
|
|
// anything else
|
|||
|
|
default:
|
|||
|
|
// Return a <delim-token> with its value set to the current input code point.
|
|||
|
|
type = types.Delim;
|
|||
|
|
offset++;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// put token to stream
|
|||
|
|
onToken(type, start, start = offset);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
exports.AtKeyword = types.AtKeyword;
|
|||
|
|
exports.BadString = types.BadString;
|
|||
|
|
exports.BadUrl = types.BadUrl;
|
|||
|
|
exports.CDC = types.CDC;
|
|||
|
|
exports.CDO = types.CDO;
|
|||
|
|
exports.Colon = types.Colon;
|
|||
|
|
exports.Comma = types.Comma;
|
|||
|
|
exports.Comment = types.Comment;
|
|||
|
|
exports.Delim = types.Delim;
|
|||
|
|
exports.Dimension = types.Dimension;
|
|||
|
|
exports.EOF = types.EOF;
|
|||
|
|
exports.Function = types.Function;
|
|||
|
|
exports.Hash = types.Hash;
|
|||
|
|
exports.Ident = types.Ident;
|
|||
|
|
exports.LeftCurlyBracket = types.LeftCurlyBracket;
|
|||
|
|
exports.LeftParenthesis = types.LeftParenthesis;
|
|||
|
|
exports.LeftSquareBracket = types.LeftSquareBracket;
|
|||
|
|
exports.Number = types.Number;
|
|||
|
|
exports.Percentage = types.Percentage;
|
|||
|
|
exports.RightCurlyBracket = types.RightCurlyBracket;
|
|||
|
|
exports.RightParenthesis = types.RightParenthesis;
|
|||
|
|
exports.RightSquareBracket = types.RightSquareBracket;
|
|||
|
|
exports.Semicolon = types.Semicolon;
|
|||
|
|
exports.String = types.String;
|
|||
|
|
exports.Url = types.Url;
|
|||
|
|
exports.WhiteSpace = types.WhiteSpace;
|
|||
|
|
exports.tokenTypes = types;
|
|||
|
|
exports.DigitCategory = charCodeDefinitions.DigitCategory;
|
|||
|
|
exports.EofCategory = charCodeDefinitions.EofCategory;
|
|||
|
|
exports.NameStartCategory = charCodeDefinitions.NameStartCategory;
|
|||
|
|
exports.NonPrintableCategory = charCodeDefinitions.NonPrintableCategory;
|
|||
|
|
exports.WhiteSpaceCategory = charCodeDefinitions.WhiteSpaceCategory;
|
|||
|
|
exports.charCodeCategory = charCodeDefinitions.charCodeCategory;
|
|||
|
|
exports.isBOM = charCodeDefinitions.isBOM;
|
|||
|
|
exports.isDigit = charCodeDefinitions.isDigit;
|
|||
|
|
exports.isHexDigit = charCodeDefinitions.isHexDigit;
|
|||
|
|
exports.isIdentifierStart = charCodeDefinitions.isIdentifierStart;
|
|||
|
|
exports.isLetter = charCodeDefinitions.isLetter;
|
|||
|
|
exports.isLowercaseLetter = charCodeDefinitions.isLowercaseLetter;
|
|||
|
|
exports.isName = charCodeDefinitions.isName;
|
|||
|
|
exports.isNameStart = charCodeDefinitions.isNameStart;
|
|||
|
|
exports.isNewline = charCodeDefinitions.isNewline;
|
|||
|
|
exports.isNonAscii = charCodeDefinitions.isNonAscii;
|
|||
|
|
exports.isNonPrintable = charCodeDefinitions.isNonPrintable;
|
|||
|
|
exports.isNumberStart = charCodeDefinitions.isNumberStart;
|
|||
|
|
exports.isUppercaseLetter = charCodeDefinitions.isUppercaseLetter;
|
|||
|
|
exports.isValidEscape = charCodeDefinitions.isValidEscape;
|
|||
|
|
exports.isWhiteSpace = charCodeDefinitions.isWhiteSpace;
|
|||
|
|
exports.cmpChar = utils.cmpChar;
|
|||
|
|
exports.cmpStr = utils.cmpStr;
|
|||
|
|
exports.consumeBadUrlRemnants = utils.consumeBadUrlRemnants;
|
|||
|
|
exports.consumeEscaped = utils.consumeEscaped;
|
|||
|
|
exports.consumeName = utils.consumeName;
|
|||
|
|
exports.consumeNumber = utils.consumeNumber;
|
|||
|
|
exports.decodeEscaped = utils.decodeEscaped;
|
|||
|
|
exports.findDecimalNumberEnd = utils.findDecimalNumberEnd;
|
|||
|
|
exports.findWhiteSpaceEnd = utils.findWhiteSpaceEnd;
|
|||
|
|
exports.findWhiteSpaceStart = utils.findWhiteSpaceStart;
|
|||
|
|
exports.getNewlineLength = utils.getNewlineLength;
|
|||
|
|
exports.tokenNames = names;
|
|||
|
|
exports.OffsetToLocation = OffsetToLocation.OffsetToLocation;
|
|||
|
|
exports.TokenStream = TokenStream.TokenStream;
|
|||
|
|
exports.tokenize = tokenize;
|