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class.ts
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class.ts
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import type { Element } from '../../interfaces';
import { isSpace } from '../../utils/tools';
export default class ClassParser {
index: number;
separator: string;
variants: string[];
classNames?: string;
constructor(classNames?: string, separator = ':', variants?: string[]) {
this.classNames = classNames;
this.separator = separator;
this.variants = variants || [];
this.index = 0;
}
private _handle_group(removeDuplicated = true): Element[] {
if (!this.classNames) return [];
let preChar;
let char;
let group;
let func;
let variant;
let variants = [];
let variantStart = this.index + 1;
let classStart = this.index + 1;
let groupStart = this.index + 1;
let important = false;
let ignoreSpace = false;
let ignoreBracket = false;
let insideSquareBracket = false;
let brackets = 0;
const sepLength = this.separator.length;
const parts: Element[] = [];
const length = this.classNames.length;
while (this.index < length) {
this.index++;
char = this.classNames.charAt(this.index);
// ignore parsing and leave content inside square brackets as-is
if (insideSquareBracket) {
if(' \n\t\r'.includes(char)) {
insideSquareBracket = false;
} else {
if (char === ']')
insideSquareBracket = false;
continue;
}
}
// handle chars
switch (char) {
case '!':
important = true;
break;
case this.separator[0]:
if (this.classNames.slice(this.index, this.index + sepLength) === this.separator) {
variant = this.classNames.slice(variantStart, this.index);
if (variant.charAt(0) === '!') variant = variant.slice(1,);
if (this.variants.includes(variant)) {
variants.push(variant);
this.index += sepLength - 1;
variantStart = this.index + 1;
ignoreSpace = true;
}
}
break;
case '[':
insideSquareBracket = true;
break;
case '(':
preChar = this.classNames.charAt(this.index - 1);
if (preChar === '-' || (!ignoreSpace && preChar === ' ')) {
ignoreBracket = true;
} else if (ignoreSpace) {
group = this._handle_group();
} else {
brackets += 1;
func = this.classNames.slice(groupStart, this.index);
while (!isSpace(this.classNames.charAt(this.index))) {
this.index++;
}
this.index--;
}
ignoreSpace = false;
break;
case '"':
case '`':
case '\'':
case ')':
case ' ':
case '\n':
case '\t':
case '\r':
if (!ignoreSpace) {
if (groupStart !== this.index) {
const raw = this.classNames.slice(classStart, this.index);
const start = classStart - 1;
const end = this.index - 1;
if (Array.isArray(group)) {
parts.push({ raw, start, end, variants, content: group, type: 'group', important });
group = undefined;
} else if (func) {
const utility = this.classNames.slice(variantStart, this.index);
parts.push({ raw: raw, start, end, variants, content: utility, type: 'utility', important });
func = undefined;
} else if (ignoreBracket && char === ')') {
// utility with bracket
const utility = this.classNames.slice(variantStart, this.index + 1);
parts.push({ raw: raw + ')', start, end: this.index, variants, content: important ? utility.slice(1,): utility, type: 'utility', important });
} else {
const utility = this.classNames.slice(variantStart, this.index);
if (utility.charAt(0) === '*') {
parts.push({ raw, start, end, variants, content: utility.slice(1,), type: 'alias', important });
} else {
parts.push({ raw, start, end, variants, content: utility.charAt(0) === '!' ? utility.slice(1,): utility, type: 'utility', important });
}
}
variants = [];
important = false;
}
groupStart = this.index + 1;
classStart = this.index + 1;
}
variantStart = this.index + 1;
break;
default:
ignoreSpace = false;
}
if (char === ')') {
brackets -= 1;
if (!ignoreBracket && brackets < 0) break; // end group
ignoreBracket = false;
}
}
if (removeDuplicated) {
const newParts: Element[] = [];
const cache: string[] = [];
parts.forEach((item) => {
if (!cache.includes(item.raw)) {
cache.push(item.raw);
newParts.push(item);
}
});
return newParts;
}
return parts;
}
parse(removeDuplicated = true): Element[] {
if (!this.classNames) return [];
// Turn classes into group;
this.classNames = '(' + this.classNames + ')';
const elements = this._handle_group(removeDuplicated);
// Initialization, convenient for next call
this.index = 0;
this.classNames = this.classNames.slice(1, -1);
return elements;
}
}