298 lines
9.1 KiB
JavaScript
298 lines
9.1 KiB
JavaScript
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var cmpChar = require('../../tokenizer').cmpChar;
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var isDigit = require('../../tokenizer').isDigit;
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var TYPE = require('../../tokenizer').TYPE;
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var CHARCODE = require('../../tokenizer').CHARCODE;
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var WHITESPACE = TYPE.WhiteSpace;
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var COMMENT = TYPE.Comment;
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var IDENT = TYPE.Ident;
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var NUMBER = TYPE.Number;
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var DIMENSION = TYPE.Dimension;
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var PLUSSIGN = CHARCODE.PlusSign;
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var HYPHENMINUS = CHARCODE.HyphenMinus;
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var N = 110; // 'n'.charCodeAt(0)
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var DISALLOW_SIGN = true;
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var ALLOW_SIGN = false;
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function checkInteger(offset, disallowSign) {
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var pos = this.scanner.tokenStart + offset;
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var code = this.scanner.source.charCodeAt(pos);
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if (code === PLUSSIGN || code === HYPHENMINUS) {
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if (disallowSign) {
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this.error('Number sign is not allowed');
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}
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pos++;
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}
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for (; pos < this.scanner.tokenEnd; pos++) {
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if (!isDigit(this.scanner.source.charCodeAt(pos))) {
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this.error('Integer is expected', pos);
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}
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}
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}
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function checkTokenIsInteger(disallowSign) {
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return checkInteger.call(this, 0, disallowSign);
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}
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function expectCharCode(offset, code) {
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if (!cmpChar(this.scanner.source, this.scanner.tokenStart + offset, code)) {
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var msg = '';
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switch (code) {
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case N:
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msg = 'N is expected';
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break;
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case HYPHENMINUS:
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msg = 'HyphenMinus is expected';
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break;
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}
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this.error(msg, this.scanner.tokenStart + offset);
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}
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}
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// ... <signed-integer>
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// ... ['+' | '-'] <signless-integer>
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function consumeB() {
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var offset = 0;
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var sign = 0;
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var type = this.scanner.tokenType;
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while (type === WHITESPACE || type === COMMENT) {
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type = this.scanner.lookupType(++offset);
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}
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if (type !== NUMBER) {
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if (this.scanner.isDelim(PLUSSIGN, offset) ||
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this.scanner.isDelim(HYPHENMINUS, offset)) {
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sign = this.scanner.isDelim(PLUSSIGN, offset) ? PLUSSIGN : HYPHENMINUS;
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do {
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type = this.scanner.lookupType(++offset);
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} while (type === WHITESPACE || type === COMMENT);
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if (type !== NUMBER) {
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this.scanner.skip(offset);
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checkTokenIsInteger.call(this, DISALLOW_SIGN);
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}
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} else {
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return null;
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}
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}
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if (offset > 0) {
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this.scanner.skip(offset);
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}
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if (sign === 0) {
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type = this.scanner.source.charCodeAt(this.scanner.tokenStart);
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if (type !== PLUSSIGN && type !== HYPHENMINUS) {
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this.error('Number sign is expected');
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}
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}
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checkTokenIsInteger.call(this, sign !== 0);
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return sign === HYPHENMINUS ? '-' + this.consume(NUMBER) : this.consume(NUMBER);
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}
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// An+B microsyntax https://www.w3.org/TR/css-syntax-3/#anb
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module.exports = {
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name: 'AnPlusB',
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structure: {
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a: [String, null],
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b: [String, null]
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},
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parse: function() {
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var start = this.scanner.tokenStart;
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var a = null;
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var b = null;
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// <integer>
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if (this.scanner.tokenType === NUMBER) {
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checkTokenIsInteger.call(this, ALLOW_SIGN);
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b = this.consume(NUMBER);
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}
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// -n
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// -n <signed-integer>
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// -n ['+' | '-'] <signless-integer>
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// -n- <signless-integer>
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// <dashndashdigit-ident>
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else if (this.scanner.tokenType === IDENT && cmpChar(this.scanner.source, this.scanner.tokenStart, HYPHENMINUS)) {
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a = '-1';
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expectCharCode.call(this, 1, N);
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switch (this.scanner.getTokenLength()) {
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// -n
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// -n <signed-integer>
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// -n ['+' | '-'] <signless-integer>
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case 2:
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this.scanner.next();
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b = consumeB.call(this);
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break;
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// -n- <signless-integer>
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case 3:
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expectCharCode.call(this, 2, HYPHENMINUS);
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this.scanner.next();
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this.scanner.skipSC();
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checkTokenIsInteger.call(this, DISALLOW_SIGN);
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b = '-' + this.consume(NUMBER);
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break;
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// <dashndashdigit-ident>
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default:
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expectCharCode.call(this, 2, HYPHENMINUS);
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checkInteger.call(this, 3, DISALLOW_SIGN);
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this.scanner.next();
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b = this.scanner.substrToCursor(start + 2);
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}
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}
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// '+'? n
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// '+'? n <signed-integer>
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// '+'? n ['+' | '-'] <signless-integer>
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// '+'? n- <signless-integer>
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// '+'? <ndashdigit-ident>
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else if (this.scanner.tokenType === IDENT || (this.scanner.isDelim(PLUSSIGN) && this.scanner.lookupType(1) === IDENT)) {
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var sign = 0;
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a = '1';
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// just ignore a plus
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if (this.scanner.isDelim(PLUSSIGN)) {
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sign = 1;
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this.scanner.next();
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}
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expectCharCode.call(this, 0, N);
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switch (this.scanner.getTokenLength()) {
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// '+'? n
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// '+'? n <signed-integer>
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// '+'? n ['+' | '-'] <signless-integer>
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case 1:
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this.scanner.next();
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b = consumeB.call(this);
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break;
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// '+'? n- <signless-integer>
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case 2:
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expectCharCode.call(this, 1, HYPHENMINUS);
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this.scanner.next();
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this.scanner.skipSC();
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checkTokenIsInteger.call(this, DISALLOW_SIGN);
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b = '-' + this.consume(NUMBER);
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break;
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// '+'? <ndashdigit-ident>
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default:
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expectCharCode.call(this, 1, HYPHENMINUS);
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checkInteger.call(this, 2, DISALLOW_SIGN);
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this.scanner.next();
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b = this.scanner.substrToCursor(start + sign + 1);
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}
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}
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// <ndashdigit-dimension>
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// <ndash-dimension> <signless-integer>
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// <n-dimension>
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// <n-dimension> <signed-integer>
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// <n-dimension> ['+' | '-'] <signless-integer>
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else if (this.scanner.tokenType === DIMENSION) {
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var code = this.scanner.source.charCodeAt(this.scanner.tokenStart);
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var sign = code === PLUSSIGN || code === HYPHENMINUS;
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for (var i = this.scanner.tokenStart + sign; i < this.scanner.tokenEnd; i++) {
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if (!isDigit(this.scanner.source.charCodeAt(i))) {
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break;
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}
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}
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if (i === this.scanner.tokenStart + sign) {
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this.error('Integer is expected', this.scanner.tokenStart + sign);
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}
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expectCharCode.call(this, i - this.scanner.tokenStart, N);
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a = this.scanner.source.substring(start, i);
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// <n-dimension>
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// <n-dimension> <signed-integer>
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// <n-dimension> ['+' | '-'] <signless-integer>
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if (i + 1 === this.scanner.tokenEnd) {
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this.scanner.next();
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b = consumeB.call(this);
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} else {
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expectCharCode.call(this, i - this.scanner.tokenStart + 1, HYPHENMINUS);
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// <ndash-dimension> <signless-integer>
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if (i + 2 === this.scanner.tokenEnd) {
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this.scanner.next();
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this.scanner.skipSC();
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checkTokenIsInteger.call(this, DISALLOW_SIGN);
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b = '-' + this.consume(NUMBER);
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}
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// <ndashdigit-dimension>
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else {
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checkInteger.call(this, i - this.scanner.tokenStart + 2, DISALLOW_SIGN);
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this.scanner.next();
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b = this.scanner.substrToCursor(i + 1);
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}
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}
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} else {
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this.error();
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}
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if (a !== null && a.charCodeAt(0) === PLUSSIGN) {
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a = a.substr(1);
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}
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if (b !== null && b.charCodeAt(0) === PLUSSIGN) {
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b = b.substr(1);
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}
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return {
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type: 'AnPlusB',
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loc: this.getLocation(start, this.scanner.tokenStart),
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a: a,
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b: b
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};
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},
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generate: function(node) {
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var a = node.a !== null && node.a !== undefined;
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var b = node.b !== null && node.b !== undefined;
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if (a) {
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this.chunk(
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node.a === '+1' ? '+n' :
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node.a === '1' ? 'n' :
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node.a === '-1' ? '-n' :
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node.a + 'n'
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);
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if (b) {
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b = String(node.b);
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if (b.charAt(0) === '-' || b.charAt(0) === '+') {
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this.chunk(b.charAt(0));
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this.chunk(b.substr(1));
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} else {
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this.chunk('+');
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this.chunk(b);
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}
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}
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} else {
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this.chunk(String(node.b));
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}
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}
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};
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