const path = require('path')
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const sourceMap = require('source-map')
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const splitRE = /\r?\n/g
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module.exports = function generateSourceMap (script, output, filePath, content, inputMap) {
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var hashedFilename = path.basename(filePath)
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var map = new sourceMap.SourceMapGenerator()
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map.setSourceContent(hashedFilename, content)
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// check input source map from babel/coffee etc
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var inputMapConsumer = inputMap && new sourceMap.SourceMapConsumer(inputMap)
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var generatedOffset = (output ? output.split(splitRE).length : 0) + 1
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script.split(splitRE).forEach(function (line, index) {
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var ln = index + 1
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var originalLine = inputMapConsumer
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? inputMapConsumer.originalPositionFor({ line: ln, column: 0 }).line
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: ln
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if (originalLine) {
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map.addMapping({
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source: hashedFilename,
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generated: {
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line: ln + generatedOffset,
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column: 0
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},
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original: {
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line: originalLine,
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column: 0
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}
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})
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}
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})
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map._hashedFilename = hashedFilename
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return map
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}
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