Javascript - 6 languages - high accuracy
Current Languages: Java, C, HTML, PHP, CSS, Javascript
I work on the principle that whenever an input satisfies a criteria, it is given a score, and based on that score results are given.
Features:
- No built-in functions that determine language type used.
- Does not straightaway declare the input text is
x language on seeing a keyword.
- Suggests other probable languages also.
Should you feel that any of your inputs of the programs (that I have done till now) are not caught or get invalid results, then please report and I'd be happy to fix them.
Sample Input 1:
class A{public static void main(String[]a){System.out.println("<?php");}}
Sample Output 1:
My program thinks you have :
Java with a chance of 100%
Php with a chance of 25%
----------------
Explanation:
This should have failed the program and I would have printed PHP, but since my program works on the basis of scores, nothing fails and it easily identifies Java in the first place, followed by other possible results.
Sample Input 2:
class A{public static void main(String[]a){System.out.println("HelloWorld!");}}
Sample Output 2:
Java
----------------
Sample Input 3:
ABCDEFGHIJKLMNOPQRSTUVWXYZ
Sample Output 3:
Language not catched! Sorry.
----------------
The code:
// Helper functions
String.prototype.m = function(condition){
return this.match(condition);
};
String.prototype.capitalize = function(){
return this[0].toUpperCase() + this.substr(1);
};
function getFuncName(func){
var temp = func.toString();
temp = temp.substr( "function ".length);
temp = temp.substr( 0, temp.indexOf("("));
return temp.capitalize();
}
// Get input
var lang_input = prompt("Enter programming language");
// Max score of 4 per lang
function java(input){
var score = 0;
score += input.m(/class[\s\n]+[\w$]+[\s\n]*\{/) ? 1 : 0;
score += input.m(/public[\s\n]+static[\s\n]+void[\s\n]+main[\s\n]*/) ? 1 : 0;
score += input.m(/\}[\s\n]*\}[\s\n]*$/) ? 1 : 0;
score += input.m(/System[\s\n]*[.][\s\n]*out/) ? 1 : 0;
return score;
}
function c(input){
var score = 0;
// if java has passsed
if(checks[0][1] >= 3)return 0;
score += input.m(/^#include\s+<[\w.]+>\s*\n/) ? 1 : 0;
score += input.m(/main[\s\n]*\([\s\n]*(void)?[\s\n]*\)[\s\n]*\{/) ? 1 : 0;
score += input.m(/printf[\s\n]+\(/) || input.m(/%d/) ? 1 : 0;
score += input.m(/#include\s+<[\w.]+>\s*\n/) || input.m(/(%c|%f|%s)/) ? 1 : 0;
return score;
}
function PHP(input){
var score = 0;
score += input.m(/<\?php/) ? 1 : 0;
score += input.m(/\?>/) ? 1 : 0;
score += input.m(/echo/) ? 1 : 0;
score += input.m(/$[\w]+\s*=\s*/) ? 1 : 0;
return score;
}
function HTML(input){
var score = 0;
// if php has passed
if(checks[2][1] >= 2) return 0;
score += input.m(/<!DOCTYPE ["' \w:\/\/]*>/) ? 1 : 0;
score += input.m(/<html>/) && input.m(/<\/html>/) ? 1 : 0;
score += input.m(/<body>/) && input.m(/<\/body/) ? 1 : 0;
score += input.m(/<head>/) && input.m(/<\/head>/) ? 1 : 0;
return score;
}
function javascript(input){
var score = 0;
score += input.m(/console[\s\n]*[.][\s\n]*log[\s\n*]\(/) ? 1 : 0;
score += input.m(/[\s\n]*var[\s\n]+/) ? 1 : 0;
score += input.m(/[\s\n]*function[\s\n]+[\w]+[\s\n]+\(/) ? 1 : 0;
score += input.m(/document[\s\n]*[.]/) ||
( input.m(/\/\*/) && input.m(/\*\//) ) ||
( input.m(/\/\/.*\n/) )? 1 : 0;
return score;
}
function CSS(input){
var score = 0;
score += input.m(/[a-zA-Z]+[\s\n]*\{[\w\n]*[a-zA-Z\-]+[\s\n]*:/) ? 1 : 0;
// since color is more common, I give it a separate place
score += input.m(/color/) ? 1 : 0;
score += input.m(/height/) || input.m(/width/) ? 1 : 0;
score += input.m(/#[a-zA-Z]+[\s\n]*\{[\w\n]*[a-zA-Z\-]+[\s\n]*:/) ||
input.m(/[.][a-zA-Z]+[\s\n]*\{[\w\n]*[a-zA-Z\-]+[\s\n]*:/) ||
( input.m(/\/\*/) && input.m(/\*\//) ) ? 1 : 0;
return score;
}
// [Langs to check, scores]
var checks = [[java, 0], [c, 0], [PHP, 0], [HTML, 0], [javascript, 0], [CSS, 0]];
//Their scores
// Assign scores
for(var i = 0; i < checks.length; i++){
var func = checks[i][0];
checks[i][1] = func(lang_input);
}
// Sort the scores
checks.sort(function(a,b){ return b[1] - a[1]; });
var all_zero = true;
function check_all_zero(index){
if(checks[index][1] > 0){ all_zero = false; return 0; } // someone is above zero
// check next index only if it defined, else return zero
if(checks[index + 1])
check_all_zero(index + 1);
}
check_all_zero(0);
if(all_zero){
console.log("Language not catched! Sorry.");
}else {
var new_arr = []; // temp
checks.map(function(value, index){
if(value[1] > 0){
var temp = [getFuncName(value[0]), value[1]];
new_arr.push(temp);
}
});
checks = new_arr.slice(0); // array copy, because of mutation
if(checks.length === 1){
console.log(checks[0][0]);
}else{
console.log("My program thinks you have :");
checks.map(function(value){
var prob = (value[1]/4 * 100);
console.log(value[0] + " with a chance of " + prob + "%");
});
}
} // Main else block finish
console.log("----------------");
print("")can be used in many languages. \$\endgroup\$class A{public static void main(String[]a){System.println.out("Hello, World!");}}which is invalid. \$\endgroup\$<!DOCTYPE html>followed by the<html>,<body>and other tags (likemeta) in their correct order? \$\endgroup\$