import { isDigit, WhiteSpace, Comment, Ident, Number, Dimension } from '../../tokenizer/index.js'; const PLUSSIGN = 0x002B; // U+002B PLUS SIGN (+) const HYPHENMINUS = 0x002D; // U+002D HYPHEN-MINUS (-) const N = 0x006E; // U+006E LATIN SMALL LETTER N (n) const DISALLOW_SIGN = true; const ALLOW_SIGN = false; function checkInteger(offset, disallowSign) { let pos = this.tokenStart + offset; const code = this.charCodeAt(pos); if (code === PLUSSIGN || code === HYPHENMINUS) { if (disallowSign) { this.error('Number sign is not allowed'); } pos++; } for (; pos < this.tokenEnd; pos++) { if (!isDigit(this.charCodeAt(pos))) { this.error('Integer is expected', pos); } } } function checkTokenIsInteger(disallowSign) { return checkInteger.call(this, 0, disallowSign); } function expectCharCode(offset, code) { if (!this.cmpChar(this.tokenStart + offset, code)) { let msg = ''; switch (code) { case N: msg = 'N is expected'; break; case HYPHENMINUS: msg = 'HyphenMinus is expected'; break; } this.error(msg, this.tokenStart + offset); } } // ... // ... ['+' | '-'] function consumeB() { let offset = 0; let sign = 0; let type = this.tokenType; while (type === WhiteSpace || type === Comment) { type = this.lookupType(++offset); } if (type !== Number) { if (this.isDelim(PLUSSIGN, offset) || this.isDelim(HYPHENMINUS, offset)) { sign = this.isDelim(PLUSSIGN, offset) ? PLUSSIGN : HYPHENMINUS; do { type = this.lookupType(++offset); } while (type === WhiteSpace || type === Comment); if (type !== Number) { this.skip(offset); checkTokenIsInteger.call(this, DISALLOW_SIGN); } } else { return null; } } if (offset > 0) { this.skip(offset); } if (sign === 0) { type = this.charCodeAt(this.tokenStart); if (type !== PLUSSIGN && type !== HYPHENMINUS) { this.error('Number sign is expected'); } } checkTokenIsInteger.call(this, sign !== 0); return sign === HYPHENMINUS ? '-' + this.consume(Number) : this.consume(Number); } // An+B microsyntax https://www.w3.org/TR/css-syntax-3/#anb export const name = 'AnPlusB'; export const structure = { a: [String, null], b: [String, null] }; export function parse() { /* eslint-disable brace-style*/ const start = this.tokenStart; let a = null; let b = null; // if (this.tokenType === Number) { checkTokenIsInteger.call(this, ALLOW_SIGN); b = this.consume(Number); } // -n // -n // -n ['+' | '-'] // -n- // else if (this.tokenType === Ident && this.cmpChar(this.tokenStart, HYPHENMINUS)) { a = '-1'; expectCharCode.call(this, 1, N); switch (this.tokenEnd - this.tokenStart) { // -n // -n // -n ['+' | '-'] case 2: this.next(); b = consumeB.call(this); break; // -n- case 3: expectCharCode.call(this, 2, HYPHENMINUS); this.next(); this.skipSC(); checkTokenIsInteger.call(this, DISALLOW_SIGN); b = '-' + this.consume(Number); break; // default: expectCharCode.call(this, 2, HYPHENMINUS); checkInteger.call(this, 3, DISALLOW_SIGN); this.next(); b = this.substrToCursor(start + 2); } } // '+'? n // '+'? n // '+'? n ['+' | '-'] // '+'? n- // '+'? else if (this.tokenType === Ident || (this.isDelim(PLUSSIGN) && this.lookupType(1) === Ident)) { let sign = 0; a = '1'; // just ignore a plus if (this.isDelim(PLUSSIGN)) { sign = 1; this.next(); } expectCharCode.call(this, 0, N); switch (this.tokenEnd - this.tokenStart) { // '+'? n // '+'? n // '+'? n ['+' | '-'] case 1: this.next(); b = consumeB.call(this); break; // '+'? n- case 2: expectCharCode.call(this, 1, HYPHENMINUS); this.next(); this.skipSC(); checkTokenIsInteger.call(this, DISALLOW_SIGN); b = '-' + this.consume(Number); break; // '+'? default: expectCharCode.call(this, 1, HYPHENMINUS); checkInteger.call(this, 2, DISALLOW_SIGN); this.next(); b = this.substrToCursor(start + sign + 1); } } // // // // // ['+' | '-'] else if (this.tokenType === Dimension) { const code = this.charCodeAt(this.tokenStart); const sign = code === PLUSSIGN || code === HYPHENMINUS; let i = this.tokenStart + sign; for (; i < this.tokenEnd; i++) { if (!isDigit(this.charCodeAt(i))) { break; } } if (i === this.tokenStart + sign) { this.error('Integer is expected', this.tokenStart + sign); } expectCharCode.call(this, i - this.tokenStart, N); a = this.substring(start, i); // // // ['+' | '-'] if (i + 1 === this.tokenEnd) { this.next(); b = consumeB.call(this); } else { expectCharCode.call(this, i - this.tokenStart + 1, HYPHENMINUS); // if (i + 2 === this.tokenEnd) { this.next(); this.skipSC(); checkTokenIsInteger.call(this, DISALLOW_SIGN); b = '-' + this.consume(Number); } // else { checkInteger.call(this, i - this.tokenStart + 2, DISALLOW_SIGN); this.next(); b = this.substrToCursor(i + 1); } } } else { this.error(); } if (a !== null && a.charCodeAt(0) === PLUSSIGN) { a = a.substr(1); } if (b !== null && b.charCodeAt(0) === PLUSSIGN) { b = b.substr(1); } return { type: 'AnPlusB', loc: this.getLocation(start, this.tokenStart), a, b }; } export function generate(node) { if (node.a) { const a = node.a === '+1' && 'n' || node.a === '1' && 'n' || node.a === '-1' && '-n' || node.a + 'n'; if (node.b) { const b = node.b[0] === '-' || node.b[0] === '+' ? node.b : '+' + node.b; this.tokenize(a + b); } else { this.tokenize(a); } } else { this.tokenize(node.b); } }