Rabaino

rabaino.js

/***
 * @dependency jslint.js
 */

/**
 * Uses JSLINT parse tree to find variable references.
 * A variable reference is labeled as an identifier, and has no children,
 * (identifiers such as 'var' would have children).
 * @param source (or string (array string))
 * @return (array string)
 */
function findVariables(source)
{
	var variables = new Array();
	// parse source
	JSLINT(source);
	// find variables
	jslintSearch(JSLINT.tree, variables);
	return variables;
}

/**
 * Searches for variable 
 * @param node jslint parse tree node
 * @param vars (array string) 
 */
function jslintSearch(node, vars)
{
	// nothing to work with
	if(node == undefined) return;
	// is a global variable name
	if(node.identifier && node.first==undefined) vars.push(node.string);
	// is an array
	else if (node instanceof Array)
	{
		// search each element
		for(a in node)
		{
			jslintSearch(node[a], vars);
		}
	}
	// is an object
	else if(node instanceof Object)
	{
		// is a function, don't add function name
		if(node.funct)
		{
			for(v in node.funct)
				if(node.funct[v] == "var" || node.funct[v] == "param")
					vars.push(v);
		}
		// search the first part of everything else, if it exists
		else if(node.first)
			jslintSearch(node.first, vars);
		// search the second part, if it exists
		if(node.second)
			jslintSearch(node.second, vars);
	}
	// unknown
	else
	{
		vars.push("?"+typeof node);
	}
};