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August 29, 2015 14:02
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var FN_ARGS = /^function\s*[^\(]*\(\s*([^\)]*)\)/m, | |
FN_ARG_SPLIT = /,/, | |
FN_ARG = /^\s*(_?)(\S+?)\1\s*$/, | |
STRIP_COMMENTS = /((\/\/.*$)|(\/\*[\s\S]*?\*\/))/mg; | |
var fnSignature = function (fn) { | |
var fnText = fn.toString().replace(STRIP_COMMENTS, ''), | |
args = fnText.match(FN_ARGS); | |
if (!args) { return []; } | |
return args[1].split(FN_ARG_SPLIT).map(function (arg) { | |
return arg.trim(); | |
}); | |
}; | |
var addMagic = function (fn) { | |
var sig = fnSignature(fn); | |
sig.forEach(function (arg, i) { | |
fn[arg] = function () { | |
var args = [].slice.call(arguments).map(function (x) { | |
return x.toString(); | |
}).join(", "); | |
console.log( | |
arg + " (parameter #" + i + ") called with [" + args + "]" | |
); | |
return fn; | |
}; | |
}); | |
}; | |
var fn = function (a, b, c) { }; | |
addMagic(fn); | |
fn.a(1, 2).b("test").c(); |
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