82 lines
1.7 KiB
JavaScript
82 lines
1.7 KiB
JavaScript
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/**
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* Constants
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*/
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var SPLITTER = "\n at "
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/**
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* PostCSS helpers
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*/
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module.exports = {
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sourceString: sourceString,
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message: formatMessage,
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try: tryCatch
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}
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/**
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* Returns GNU style source
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*
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* @param {Object} source
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*/
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function sourceString(source) {
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var message = "<css input>"
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if (source) {
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if (source.input && source.input.file) {
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message = source.input.file
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}
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if (source.start) {
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message += ":" + source.start.line + ":" + source.start.column
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}
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}
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return message
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}
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/**
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* Returns a GNU style message
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*
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* @param {String} message
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* @param {Object} source a PostCSS source object
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* @return {String}
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*/
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function formatMessage(message, source) {
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return sourceString(source) + ": " + message
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}
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/**
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* Do something and throw an error with enhanced exception (from given source)
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*
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* @param {Function} fn [description]
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* @param {[type]} source [description]
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*/
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function tryCatch(fn, source) {
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try {
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return fn()
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}
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catch (err) {
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err.originalMessage = err.message
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err.message = formatMessage(err.message, source)
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// if source seems interesting, enhance error
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if (typeof source === "object") {
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// add a stack item if something interesting available
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if ((source.input && source.input.file) || source.start) {
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var stack = err.stack.split(SPLITTER)
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var firstStackItem = stack.shift()
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stack.unshift(sourceString(source))
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stack.unshift(firstStackItem)
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err.stack = stack.join(SPLITTER)
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}
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if (source.input && source.input.file) {
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err.fileName = source.input.file
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}
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if (source.start) {
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err.lineNumber = source.start.line
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err.columnNumber = source.start.column
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}
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}
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throw err
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}
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}
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