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33 lines
950 B
JavaScript

'use strict';
var SourceMapConsumer = require('source-map').SourceMapConsumer;
var extend = require('xtend');
function isEmptyMapping (pos) {
return ['source', 'line', 'column', 'name'].every(function (prop) {
return pos[prop] === null;
});
}
function PositionDetector (sourceMap) {
if (sourceMap) {
this.sourceMapConsumer = new SourceMapConsumer(sourceMap);
}
}
PositionDetector.prototype.positionFor = function (currentNode) {
var currentPosition = {
source: currentNode.loc.source,
line: currentNode.loc.start.line,
column: currentNode.loc.start.column
};
if (this.sourceMapConsumer) {
var found = this.sourceMapConsumer.originalPositionFor(currentPosition);
if (found && !isEmptyMapping(found)) {
return extend({ mapped: true }, found);
}
}
return extend({ mapped: false }, currentPosition);
};
module.exports = PositionDetector;