nehan/dist/selector-lexer.js

Html layout engine for paged-media written in Typescript

import { SelectorTokenType, Lexer, Utils, } from "./public-api";
export class SelectorLexer extends Lexer {
    normalize(source) {
        let norm = source.trim();
        norm = Utils.String.multiSpaceToSingle(source);
        norm = norm.replace(/\s*([=>~+])\s*/g, "$1");
        return norm;
    }
    addToken(token) {
        this.tokens.unshift(token);
    }
    createToken() {
        let c1 = this.peekChar();
        if (c1 === ",") {
            throw new Error("comma separator is not allowed");
        }
        if (c1 === "*") {
            this.stepBuff(1);
            return { type: SelectorTokenType.UNIVERSAL_SELECTOR, value: c1 };
        }
        let type_match = SelectorLexer.rexTypeSelector.exec(this.buff);
        if (type_match !== null) {
            let selector = type_match[0];
            this.stepBuff(selector.length);
            return { type: SelectorTokenType.TYPE_SELECTOR, value: selector };
        }
        let class_match = SelectorLexer.rexClassSelector.exec(this.buff);
        if (class_match !== null) {
            let selector = class_match[0];
            let value = selector.substring(1);
            this.stepBuff(selector.length);
            return { type: SelectorTokenType.CLASS_SELECTOR, value: value };
        }
        let id_match = SelectorLexer.rexIdSelector.exec(this.buff);
        if (id_match !== null) {
            let selector = id_match[0];
            let value = selector.substring(1);
            this.stepBuff(selector.length);
            return { type: SelectorTokenType.ID_SELECTOR, value: value };
        }
        let attr_match = SelectorLexer.rexAttrSelector.exec(this.buff);
        if (attr_match !== null) {
            let selector = attr_match[0];
            let value = RegExp.$1;
            this.stepBuff(selector.length);
            return { type: SelectorTokenType.ATTR_SELECTOR, value: value };
        }
        let pc_match = SelectorLexer.rexPseudoClass.exec(this.buff);
        if (pc_match !== null) {
            let selector = pc_match[0];
            let value = selector.substring(1);
            this.stepBuff(selector.length);
            return { type: SelectorTokenType.PSEUDO_CLASS, value: value };
        }
        let pe_match = SelectorLexer.rexPseudoElement.exec(this.buff);
        if (pe_match !== null) {
            let selector = pe_match[0];
            let value = selector.substring(2);
            this.stepBuff(selector.length);
            if (this.src == selector) {
                return { type: SelectorTokenType.TYPE_SELECTOR, value: selector };
            }
            return { type: SelectorTokenType.PSEUDO_ELEMENT, value: value };
        }
        switch (c1) {
            case " ":
            case "+":
            case "~":
            case ">":
                this.stepBuff(1);
                return { type: SelectorTokenType.COMBINATOR, value: c1 };
        }
        throw new Error(this.src);
    }
}
SelectorLexer.rexMediaSelector = /^@[a-z]*/;
SelectorLexer.rexTypeSelector = /^[a-zA-Z][_a-zA-Z0-9-]*/;
SelectorLexer.rexClassSelector = /^\.[_a-zA-Z][_a-zA-Z0-9-]*/;
SelectorLexer.rexAttrSelector = /^\[(.*?)\]/;
SelectorLexer.rexIdSelector = /^#[_a-zA-Z][_a-zA-Z0-9-]*/;
SelectorLexer.rexPseudoClass = /^:[_a-z][_a-z0-9-]*[_a-z0-9-.,()]*/;
SelectorLexer.rexPseudoElement = /^::[_a-z][_a-z0-9-]*/;
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