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