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