nehan/dist/lexer.js

Html layout engine for paged-media written in Typescript

export class Lexer {
    constructor(src, args = {}) {
        this.src = this.normalize(src, args);
        this.buff = this.src;
        this.pos = 0;
        this.tokens = [];
        this.setupTokens(args);
    }
    acceptTokenMapper(visitor) {
        this.tokens = visitor.visit(this.tokens);
    }
    normalize(src, args = {}) {
        return src;
    }
    stepBuff(count) {
        this.buff = this.buff.substring(count);
    }
    getChar() {
        let c1 = this.peekChar();
        this.stepBuff(1);
        return c1;
    }
    peekChar() {
        return this.buff.substring(0, 1);
    }
    get progress() {
        if (this.tokens.length === 0) {
            return 1;
        }
        return this.pos / this.tokens.length;
    }
    hasNext() {
        let has_next = this.pos < this.tokens.length;
        return has_next;
    }
    getNext() {
        let token = this.tokens[this.pos++];
        return token;
    }
    setupTokens(args) {
        while (this.hasNextBuff()) {
            this.addToken(this.createToken(args));
        }
        return this.tokens;
    }
    addToken(token) {
        this.tokens.push(token);
    }
    createToken(args) {
        throw new Error("BufferedLexer.createToken must be overrided");
    }
    hasNextBuff() {
        return this.buff !== "";
    }
    peek(offset = 0) {
        return this.tokens[this.pos + offset];
    }
    pushBack(count) {
        this.pos = Math.max(0, this.pos - Math.abs(count));
    }
}
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