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119
node_modules/volar-service-emmet/lib/bufferStream.js
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119
node_modules/volar-service-emmet/lib/bufferStream.js
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"use strict";
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/*---------------------------------------------------------------------------------------------
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* Copyright (c) Microsoft Corporation. All rights reserved.
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* Licensed under the MIT License. See License.txt in the project root for license information.
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*--------------------------------------------------------------------------------------------*/
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.DocumentStreamReader = void 0;
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/**
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* A stream reader for VSCode's `TextDocument`
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* Based on @emmetio/stream-reader and @emmetio/atom-plugin
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*/
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class DocumentStreamReader {
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constructor(document, pos, limit) {
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this.document = document;
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this.start = this.pos = pos ? pos : 0;
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this._sof = limit ? limit[0] : 0;
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this._eof = limit ? limit[1] : document.getText().length;
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}
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/**
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* Returns true only if the stream is at the start of the file.
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*/
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sof() {
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return this.pos <= this._sof;
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}
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/**
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* Returns true only if the stream is at the end of the file.
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*/
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eof() {
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return this.pos >= this._eof;
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}
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/**
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* Creates a new stream instance which is limited to given range for given document
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*/
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limit(start, end) {
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return new DocumentStreamReader(this.document, start, [start, end]);
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}
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/**
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* Returns the next character code in the stream without advancing it.
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* Will return NaN at the end of the file.
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*/
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peek() {
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if (this.eof()) {
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return NaN;
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}
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return this.document.getText().charCodeAt(this.pos);
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}
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/**
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* Returns the next character in the stream and advances it.
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* Also returns NaN when no more characters are available.
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*/
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next() {
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if (this.eof()) {
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return NaN;
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}
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const code = this.document.getText().charCodeAt(this.pos);
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this.pos++;
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if (this.eof()) {
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// restrict pos to eof, if in case it got moved beyond eof
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this.pos = this._eof;
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}
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return code;
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}
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/**
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* Backs up the stream n characters. Backing it up further than the
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* start of the current token will cause things to break, so be careful.
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*/
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backUp(n) {
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this.pos -= n;
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if (this.pos < 0) {
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this.pos = 0;
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}
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return this.peek();
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}
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/**
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* Get the string between the start of the current token and the
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* current stream position.
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*/
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current() {
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return this.substring(this.start, this.pos);
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}
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/**
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* Returns contents for given range
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*/
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substring(from, to) {
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return this.document.getText().substring(from, to);
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}
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/**
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* Creates error object with current stream state
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*/
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error(message) {
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const err = new Error(`${message} at offset ${this.pos}`);
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return err;
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}
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/**
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* `match` can be a character code or a function that takes a character code
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* and returns a boolean. If the next character in the stream 'matches'
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* the given argument, it is consumed and returned.
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* Otherwise, `false` is returned.
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*/
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eat(match) {
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const ch = this.peek();
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const ok = typeof match === 'function' ? match(ch) : ch === match;
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if (ok) {
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this.next();
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}
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return ok;
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}
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/**
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* Repeatedly calls <code>eat</code> with the given argument, until it
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* fails. Returns <code>true</code> if any characters were eaten.
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*/
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eatWhile(match) {
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const start = this.pos;
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while (!this.eof() && this.eat(match)) { }
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return this.pos !== start;
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}
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}
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exports.DocumentStreamReader = DocumentStreamReader;
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//# sourceMappingURL=bufferStream.js.map
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