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/*---------------------------------------------------------------------------------------------
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License. See License.txt in the project root for license information.
*--------------------------------------------------------------------------------------------*/
/* Based on @sergeche's work in his emmet plugin */
'use strict';
Object.defineProperty(exports, "__esModule", { value: true });
const vscode_1 = require("vscode");
/**
* A stream reader for VSCode's `TextDocument`
* Based on @emmetio/stream-reader and @emmetio/atom-plugin
*/
class DocumentStreamReader {
constructor(document, pos, limit) {
this.document = document;
this.start = this.pos = pos ? pos : new vscode_1.Position(0, 0);
this._sof = limit ? limit.start : new vscode_1.Position(0, 0);
this._eof = limit ? limit.end : new vscode_1.Position(this.document.lineCount - 1, this._lineLength(this.document.lineCount - 1));
this._eol = this.document.eol === vscode_1.EndOfLine.LF ? '\n' : '\r\n';
}
/**
* Returns true only if the stream is at the start of the file.
*/
sof() {
return this.pos.isBeforeOrEqual(this._sof);
}
/**
* Returns true only if the stream is at the end of the file.
*/
eof() {
return this.pos.isAfterOrEqual(this._eof);
}
/**
* Creates a new stream instance which is limited to given range for given document
*/
limit(start, end) {
return new DocumentStreamReader(this.document, start, new vscode_1.Range(start, end));
}
/**
* Returns the next character code in the stream without advancing it.
* Will return NaN at the end of the file.
*/
peek() {
if (this.eof()) {
return NaN;
}
const line = this.document.lineAt(this.pos.line).text;
return this.pos.character < line.length ? line.charCodeAt(this.pos.character) : this._eol.charCodeAt(this.pos.character - line.length);
}
/**
* Returns the next character in the stream and advances it.
* Also returns NaN when no more characters are available.
*/
next() {
if (this.eof()) {
return NaN;
}
const line = this.document.lineAt(this.pos.line).text;
let code;
if (this.pos.character < line.length) {
code = line.charCodeAt(this.pos.character);
this.pos = this.pos.translate(0, 1);
}
else {
code = this._eol.charCodeAt(this.pos.character - line.length);
this.pos = new vscode_1.Position(this.pos.line + 1, 0);
}
if (this.eof()) {
// restrict pos to eof, if in case it got moved beyond eof
this.pos = new vscode_1.Position(this._eof.line, this._eof.character);
}
return code;
}
/**
* 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.
*/
backUp(n) {
let row = this.pos.line;
let column = this.pos.character;
column -= (n || 1);
while (row >= 0 && column < 0) {
row--;
column += this._lineLength(row);
}
this.pos = row < 0 || column < 0
? new vscode_1.Position(0, 0)
: new vscode_1.Position(row, column);
return this.peek();
}
/**
* Get the string between the start of the current token and the
* current stream position.
*/
current() {
return this.substring(this.start, this.pos);
}
/**
* Returns contents for given range
*/
substring(from, to) {
return this.document.getText(new vscode_1.Range(from, to));
}
/**
* Creates error object with current stream state
*/
error(message) {
const err = new Error(`${message} at row ${this.pos.line}, column ${this.pos.character}`);
return err;
}
/**
* Returns line length of given row, including line ending
*/
_lineLength(row) {
if (row === this.document.lineCount - 1) {
return this.document.lineAt(row).text.length;
}
return this.document.lineAt(row).text.length + this._eol.length;
}
/**
* `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.
*/
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.
*/
eatWhile(match) {
const start = this.pos;
while (!this.eof() && this.eat(match)) { }
return !this.pos.isEqual(start);
}
}
exports.DocumentStreamReader = DocumentStreamReader;
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