57 lines
1.8 KiB
JavaScript
57 lines
1.8 KiB
JavaScript
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var LF = '\n';
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var CR = '\r';
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var LinesAndColumns = (function () {
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function LinesAndColumns(string) {
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this.string = string;
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var offsets = [0];
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for (var offset = 0; offset < string.length;) {
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switch (string[offset]) {
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case LF:
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offset += LF.length;
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offsets.push(offset);
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break;
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case CR:
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offset += CR.length;
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if (string[offset] === LF) {
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offset += LF.length;
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}
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offsets.push(offset);
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break;
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default:
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offset++;
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break;
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}
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}
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this.offsets = offsets;
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}
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LinesAndColumns.prototype.locationForIndex = function (index) {
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if (index < 0 || index > this.string.length) {
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return null;
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}
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var line = 0;
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var offsets = this.offsets;
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while (offsets[line + 1] <= index) {
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line++;
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}
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var column = index - offsets[line];
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return { line: line, column: column };
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};
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LinesAndColumns.prototype.indexForLocation = function (location) {
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var line = location.line, column = location.column;
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if (line < 0 || line >= this.offsets.length) {
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return null;
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}
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if (column < 0 || column > this.lengthOfLine(line)) {
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return null;
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}
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return this.offsets[line] + column;
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};
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LinesAndColumns.prototype.lengthOfLine = function (line) {
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var offset = this.offsets[line];
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var nextOffset = line === this.offsets.length - 1 ? this.string.length : this.offsets[line + 1];
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return nextOffset - offset;
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};
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return LinesAndColumns;
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}());
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export default LinesAndColumns;
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