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indentRanges.ts
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indentRanges.ts
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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.
*--------------------------------------------------------------------------------------------*/
'use strict';
import { ITextModel } from 'vs/editor/common/editorCommon';
export class IndentRange {
_indentRangeBrand: void;
startLineNumber: number;
endLineNumber: number;
indent: number;
constructor(startLineNumber: number, endLineNumber: number, indent: number) {
this.startLineNumber = startLineNumber;
this.endLineNumber = endLineNumber;
this.indent = indent;
}
public static deepCloneArr(indentRanges: IndentRange[]): IndentRange[] {
let result: IndentRange[] = [];
for (let i = 0, len = indentRanges.length; i < len; i++) {
let r = indentRanges[i];
result[i] = new IndentRange(r.startLineNumber, r.endLineNumber, r.indent);
}
return result;
}
}
export function computeRanges(model: ITextModel, minimumRangeSize: number = 1): IndentRange[] {
let result: IndentRange[] = [];
let previousRegions: { indent: number, line: number }[] = [];
previousRegions.push({ indent: -1, line: model.getLineCount() + 1 }); // sentinel, to make sure there's at least one entry
for (let line = model.getLineCount(); line > 0; line--) {
let indent = model.getIndentLevel(line);
if (indent === -1) {
continue; // only whitespace
}
let previous = previousRegions[previousRegions.length - 1];
if (previous.indent > indent) {
// discard all regions with larger indent
do {
previousRegions.pop();
previous = previousRegions[previousRegions.length - 1];
} while (previous.indent > indent);
// new folding range
let endLineNumber = previous.line - 1;
if (endLineNumber - line >= minimumRangeSize) {
result.push(new IndentRange(line, endLineNumber, indent));
}
}
if (previous.indent === indent) {
previous.line = line;
} else { // previous.indent < indent
// new region with a bigger indent
previousRegions.push({ indent, line });
}
}
return result.reverse();
}