ts-simple-ast/dist/utils/AdvancedIterator.js

TypeScript compiler wrapper for AST navigation and code generation.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const errors = require("./../errors");
class AdvancedIterator {
    constructor(iterator) {
        this.iterator = iterator;
        this.buffer = Array.from(Array(3)); // previous, current, next
        this.bufferIndex = 0;
        this.isDone = false;
        this.nextCount = 0;
        this.advance();
    }
    get done() {
        return this.isDone;
    }
    get current() {
        if (this.nextCount === 0)
            throw new errors.InvalidOperationError("Cannot get the current when the iterator has not been advanced.");
        return this.buffer[this.bufferIndex];
    }
    get previous() {
        if (this.nextCount <= 1)
            throw new errors.InvalidOperationError("Cannot get the previous when the iterator has not advanced enough.");
        return this.buffer[(this.bufferIndex + this.buffer.length - 1) % this.buffer.length];
    }
    get peek() {
        if (this.isDone)
            throw new errors.InvalidOperationError("Cannot peek at the end of the iterator.");
        return this.buffer[(this.bufferIndex + 1) % this.buffer.length];
    }
    next() {
        if (this.done)
            throw new errors.InvalidOperationError("Cannot get the next when at the end of the iterator.");
        const next = this.buffer[this.getNextBufferIndex()];
        this.advance();
        this.nextCount++;
        return next;
    }
    *rest() {
        while (!this.done)
            yield this.next();
    }
    advance() {
        const next = this.iterator.next();
        this.bufferIndex = this.getNextBufferIndex();
        if (next.done) {
            this.isDone = true;
            return;
        }
        this.buffer[this.getNextBufferIndex()] = next.value;
    }
    getNextBufferIndex() {
        return (this.bufferIndex + 1) % this.buffer.length;
    }
}
exports.AdvancedIterator = AdvancedIterator;

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