Method pushNewRecursionContext

runtime/JavaScript/src/antlr4/Parser.js:434–446

(localctx, state, ruleIndex)

    // Like {@link //enterRule} but for recursive rules.
    pushNewRecursionContext(localctx, state, ruleIndex) {
        const previous = this._ctx;
        previous.parentCtx = localctx;
        previous.invokingState = state;
        previous.stop = this._input.LT(-1);

        this._ctx = localctx;
        this._ctx.start = previous.start;
        if (this.buildParseTrees) {
            this._ctx.addChild(previous);
        }
        this.triggerEnterRuleEvent(); // simulates rule entry for left-recursive rules
    }

    unrollRecursionContexts(parentCtx) {
        this._precedenceStack.pop();