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stream-reader.es.js

/**
 * A streaming, character code-based string reader
 */
class StreamReader {
	constructor(string, start, end) {
		if (end == null && typeof string === 'string') {
			end = string.length;
		}

this.string = string;
		this.pos = this.start = start || 0;
		this.end = end;
	}

/**
	 * Returns true only if the stream is at the end of the file.
	 * @returns {Boolean}
	 */
	eof() {
		return this.pos >= this.end;
	}

/**
	 * Creates a new stream instance which is limited to given `start` and `end`
	 * range. E.g. its `eof()` method will look at `end` property, not actual
	 * stream end
	 * @param  {Point} start
	 * @param  {Point} end
	 * @return {StreamReader}
	 */
	limit(start, end) {
		return new this.constructor(this.string, start, end);
	}

/**
	 * Returns the next character code in the stream without advancing it.
	 * Will return NaN at the end of the file.
	 * @returns {Number}
	 */
	peek() {
		return this.string.charCodeAt(this.pos);
	}

/**
	 * Returns the next character in the stream and advances it.
	 * Also returns <code>undefined</code> when no more characters are available.
	 * @returns {Number}
	 */
	next() {
		if (this.pos < this.string.length) {
			return this.string.charCodeAt(this.pos++);
		}
	}

/**
	 * `match` can be a character code or a function that takes a character code
	 * and returns a boolean. If the next character in the stream 'matches'
	 * the given argument, it is consumed and returned.
	 * Otherwise, `false` is returned.
	 * @param {Number|Function} match
	 * @returns {Boolean}
	 */
	eat(match) {
		const ch = this.peek();
		const ok = typeof match === 'function' ? match(ch) : ch === match;

if (ok) {
			this.next();
		}

return ok;
	}

/**
	 * Repeatedly calls <code>eat</code> with the given argument, until it
	 * fails. Returns <code>true</code> if any characters were eaten.
	 * @param {Object} match
	 * @returns {Boolean}
	 */
	eatWhile(match) {
		const start = this.pos;
		while (!this.eof() && this.eat(match)) {}
		return this.pos !== start;
	}

/**
	 * Backs up the stream n characters. Backing it up further than the
	 * start of the current token will cause things to break, so be careful.
	 * @param {Number} n
	 */
	backUp(n) {
		this.pos -= (n || 1);
	}

/**
	 * Get the string between the start of the current token and the
	 * current stream position.
	 * @returns {String}
	 */
	current() {
		return this.substring(this.start, this.pos);
	}

/**
	 * Returns substring for given range
	 * @param  {Number} start
	 * @param  {Number} [end]
	 * @return {String}
	 */
	substring(start, end) {
		return this.string.slice(start, end);
	}

/**
	 * Creates error object with current stream state
	 * @param {String} message
	 * @return {Error}
	 */
	error(message) {
		const err = new Error(`${message} at char ${this.pos + 1}`);
		err.originalMessage = message;
		err.pos = this.pos;
		err.string = this.string;
		return err;
	}
}

export default StreamReader;

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Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	bienesraicess/bienesraicess	0755	2025-02-01 04:36:28
..	dir	-	bienesraicess/bienesraicess	0755	2025-02-01 04:36:28
stream-reader.cjs.js	file	2.89 KB	bienesraicess/bienesraicess	0644	2025-02-01 04:36:28
stream-reader.es.js	file	2.88 KB	bienesraicess/bienesraicess	0644	2025-02-01 04:36:28