92 lines
2.6 KiB
JavaScript
92 lines
2.6 KiB
JavaScript
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var adoptBuffer = require('./adopt-buffer');
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var isBOM = require('../tokenizer').isBOM;
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var N = 10;
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var F = 12;
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var R = 13;
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function computeLinesAndColumns(host, source) {
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var sourceLength = source.length;
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var lines = adoptBuffer(host.lines, sourceLength); // +1
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var line = host.startLine;
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var columns = adoptBuffer(host.columns, sourceLength);
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var column = host.startColumn;
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var startOffset = source.length > 0 ? isBOM(source.charCodeAt(0)) : 0;
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for (var i = startOffset; i < sourceLength; i++) { // -1
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var code = source.charCodeAt(i);
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lines[i] = line;
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columns[i] = column++;
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if (code === N || code === R || code === F) {
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if (code === R && i + 1 < sourceLength && source.charCodeAt(i + 1) === N) {
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i++;
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lines[i] = line;
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columns[i] = column;
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}
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line++;
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column = 1;
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}
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}
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lines[i] = line;
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columns[i] = column;
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host.lines = lines;
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host.columns = columns;
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}
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var OffsetToLocation = function() {
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this.lines = null;
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this.columns = null;
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this.linesAndColumnsComputed = false;
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};
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OffsetToLocation.prototype = {
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setSource: function(source, startOffset, startLine, startColumn) {
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this.source = source;
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this.startOffset = typeof startOffset === 'undefined' ? 0 : startOffset;
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this.startLine = typeof startLine === 'undefined' ? 1 : startLine;
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this.startColumn = typeof startColumn === 'undefined' ? 1 : startColumn;
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this.linesAndColumnsComputed = false;
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},
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ensureLinesAndColumnsComputed: function() {
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if (!this.linesAndColumnsComputed) {
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computeLinesAndColumns(this, this.source);
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this.linesAndColumnsComputed = true;
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}
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},
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getLocation: function(offset, filename) {
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this.ensureLinesAndColumnsComputed();
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return {
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source: filename,
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offset: this.startOffset + offset,
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line: this.lines[offset],
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column: this.columns[offset]
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};
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},
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getLocationRange: function(start, end, filename) {
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this.ensureLinesAndColumnsComputed();
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return {
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source: filename,
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start: {
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offset: this.startOffset + start,
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line: this.lines[start],
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column: this.columns[start]
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},
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end: {
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offset: this.startOffset + end,
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line: this.lines[end],
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column: this.columns[end]
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}
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};
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}
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};
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module.exports = OffsetToLocation;
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