--- /dev/null
+<html>
+<head>
+<script src="https://code.jquery.com/jquery-2.2.3.min.js"></script>
+<script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js"></script>
+<script>
+
+function arg_names(f) {
+ return f.toString ().match (/function\s*\w*\s*\((.*?)\)/)[1].split (/\s*,\s*/);
+}
+
+var params = {};
+var args = [];
+var f = function (a, b, c) { return a + b + c; }
+function change_parameters(new_args) {
+ var old_args = args;
+ var added_args = _.difference(new_args, old_args);
+ var removed_args = _.difference(old_args, new_args);
+ var same_args = _.intersection(old_args, new_args);
+ _.each(removed_args, function(arg) {
+ delete params[arg];
+ $("#inputs input[name=" + arg + "]").remove();
+ });
+ _.each(added_args, function(arg) {
+ $("#inputs").append("<div>" + arg + ": <input type=\"text\" name=\"" + arg + "\" value=\"\"></div>");
+ $("#inputs input[name=" + arg + "]").on("input", function() {
+ load_inputs();
+ recalc();
+ });
+ });
+ args = new_args;
+}
+
+function load_inputs() {
+ _.each(args, function(arg) {
+ var arg_value = $("#inputs input[name=" + arg + "]").val();
+ arg_value = Number.parseFloat(arg_value);
+ if (!_.isNaN(arg_value)) {
+ params[arg] = arg_value;
+ }
+ });
+}
+
+function redefine(definition) {
+ try {
+ f = eval("(" + definition + ")");
+ } catch (e) {
+ $("#error").text(e);
+ return;
+ }
+ $("#error").text(null);
+ change_parameters(arg_names(f));
+}
+
+function recalc() {
+ var fargs = _.map(args, function(arg) {
+ return params[arg];
+ });
+ try {
+ var result = f.apply(params, fargs);
+ } catch (e) {
+ $("#result").text(e);
+ return;
+ }
+ $("#result").text(result);
+}
+
+$(function() {
+ $("#formula").on("input", function() {
+ redefine($("#formula").text().trim());
+ recalc();
+ });
+ $("#inputs input").on("input", function() {
+ load_inputs();
+ recalc();
+ });
+
+ redefine($("#formula").text().trim());
+ load_inputs();
+ recalc();
+});
+</script>
+</head>
+<body>
+ definitition: <div id="formula" contenteditable="true">
+ function(r, h) {<br/>
+ return Math.PI * Math.pow(r, 2) * h;<br/>
+ }<br/>
+ </div>
+ Error: <div id="error"></div>
+ Inputs: <div id="inputs"></div>
+ Result: <div id="result"></div>
+</body>
+</html>
projects / za3k.git / commitdiff