usfm/lib/lexer.js

A [USFM](http://paratext.org/about/usfm) parser for JavaScript (written in TypeScript).

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const lexer_1 = require("perplex/lib/lexer");
class UsfmLexer {
    constructor(s) {
        this.lexer = new lexer_1.default(s);
        this.lexer.token('TAG', /\\\+?[a-z0-9]+\*?\s*/i);
        this.lexer.token('TEXT', /[^\\]+/);
    }
    _tkn(t) {
        if (t.type == 'TAG')
            t.type = t.match.replace(/^\\/, '').trim();
        return t;
    }
    peek() {
        return this._tkn(this.lexer.peek());
    }
    next() {
        return this._tkn(this.lexer.next());
    }
    expect(type) {
        const token = this.lexer.next();
        const surrogateType = token.type == 'TAG' ? token.match.replace(/^\\/, '').trim() : token.type;
        if (surrogateType != type) {
            const { start } = token.strpos();
            throw new Error(`Expected ${type}, got ${surrogateType} (at ${start.line}:${start.column})`);
        }
        return token;
    }
}
exports.UsfmLexer = UsfmLexer;
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