flow like the river

VISUALIZACION/node_modules/reduce-function-call/index.js

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+/*
+ * Module dependencies
+ */
+var balanced = require("balanced-match")
+
+/**
+ * Expose `reduceFunctionCall`
+ *
+ * @type {Function}
+ */
+module.exports = reduceFunctionCall
+
+/**
+ * Walkthrough all expressions, evaluate them and insert them into the declaration
+ *
+ * @param {Array} expressions
+ * @param {Object} declaration
+ */
+
+function reduceFunctionCall(string, functionRE, callback) {
+  var call = string
+  return getFunctionCalls(string, functionRE).reduce(function(string, obj) {
+    return string.replace(obj.functionIdentifier + "(" + obj.matches.body + ")", evalFunctionCall(obj.matches.body, obj.functionIdentifier, callback, call, functionRE))
+  }, string)
+}
+
+/**
+ * Parses expressions in a value
+ *
+ * @param {String} value
+ * @returns {Array}
+ * @api private
+ */
+
+function getFunctionCalls(call, functionRE) {
+  var expressions = []
+
+  var fnRE = typeof functionRE === "string" ? new RegExp("\\b(" + functionRE + ")\\(") : functionRE
+  do {
+    var searchMatch = fnRE.exec(call)
+    if (!searchMatch) {
+      return expressions
+    }
+    if (searchMatch[1] === undefined) {
+      throw new Error("Missing the first couple of parenthesis to get the function identifier in " + functionRE)
+    }
+    var fn = searchMatch[1]
+    var startIndex = searchMatch.index
+    var matches = balanced("(", ")", call.substring(startIndex))
+
+    if (!matches || matches.start !== searchMatch[0].length - 1) {
+      throw new SyntaxError(fn + "(): missing closing ')' in the value '" + call + "'")
+    }
+
+    expressions.push({matches: matches, functionIdentifier: fn})
+    call = matches.post
+  }
+  while (fnRE.test(call))
+
+  return expressions
+}
+
+/**
+ * Evaluates an expression
+ *
+ * @param {String} expression
+ * @returns {String}
+ * @api private
+ */
+
+function evalFunctionCall (string, functionIdentifier, callback, call, functionRE) {
+  // allow recursivity
+  return callback(reduceFunctionCall(string, functionRE, callback), functionIdentifier, call)
+}