pegisland/dist/src/Rule.js

General PEG-based parser supporting island grammars with lake symbols

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.Rule = void 0;
const ParseTree_1 = require("./ParseTree");
class Rule {
    constructor(symbol, rhs, isWater = false) {
        this.symbol = symbol;
        this.rhs = rhs;
        this.isWater = isWater;
    }
    parse(env, pos) {
        return this.parseWithoutMemo(env, pos);
    }
    parseWithoutMemo(env, pos) {
        env.push();
        const result = env.parse(this.rhs, pos);
        env.pop();
        if (result === null) {
            return null;
        }
        const [childNode, nextIndex] = result;
        return [
            new ParseTree_1.NodeNonterminal(this.symbol, new ParseTree_1.Range(pos, nextIndex), childNode),
            nextIndex,
        ];
    }
}
exports.Rule = Rule;
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