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build/node_modules/postcss-message-helpers/index.js

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