I am parsing a webpage and I obtain the following JS function as a string
"translate(737.4170532226562,136.14541625976562)"
I want to parse the string to obtain the two parameters of the function.
I can parse the string upto the '(' and ',' and ')' to get the arguments - I wanted to know if there is any other method to get the parameters from this string function.
You can use regex for this purpose. For example this one: /([\d\.]+),([\d\.]+)/
var str = "translate(737.4170532226562,136.14541625976562)";
var args = /([\d\.]+),([\d\.]+)/.exec(str)
var a1 = args[1], a2 = args[2];
document.write(['First argument: ', a1, '<br> Second argument: ', a2].join(''))This may be overkill. But I was bored. So here is a function name parser. It gets the function name and the arguments.
var program = "translate(737.4170532226562,136.14541625976562)";
function Parser(s)
{
this.text = s;
this.length = s.length;
this.position = 0;
this.look = '0'
this.next();
}
Parser.prototype.isName = function() {
return this.look <= 'z' && this.look >= 'a' || this.look <= '9' && this.look >= '0' || this.look == '.'
}
Parser.prototype.next = function() {
this.look = this.text[this.position++];
}
Parser.prototype.getName = function() {
var name = "";
while(parser.isName()) {
name += parser.look;
parser.next();
}
return name;
}
var parser = new Parser(program);
var fname = parser.getName();
var args = [];
if(parser.look == '(') {
parser.next();
args.push(parser.getName());
while(parser.look == ',') {
parser.next();
args.push(parser.getName());
}
} else {
throw new Error("name must be followed by ()")
}
console.log(fname, args);
A littlebit late, but i think this way its much easier to get params or execute a custom function with other function params.
var functionString = "translate(737.4170532226562,136.14541625976562)";
function parser(s){
let funcName = s.split('(')[0];
let evalfunc = s.replace(funcName, 'getParams');
return eval(evalfunc);
}
function getParams(...params){
return params;
}
console.log(parser(functionString));
/translate\(([0-9\.]+),([0-9\.])\)/. Or you could make atranslate(a,b)function andevalthe string, if you trust the source, of course.