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// ufuzz.js
// derived from https://github.com/qfox/uglyfuzzer by Peter van der Zee
"use strict";
// workaround for tty output truncation upon process.exit()
[process.stdout, process.stderr].forEach(function(stream){
if (stream._handle && stream._handle.setBlocking)
stream._handle.setBlocking(true);
});
var vm = require("vm");
var minify = require("..").minify;
function run_code(code) {
var stdout = "";
var original_write = process.stdout.write;
process.stdout.write = function(chunk) {
stdout += chunk;
};
try {
new vm.Script(code).runInNewContext({ console: console }, { timeout: 5000 });
return stdout;
} catch (ex) {
return ex;
} finally {
process.stdout.write = original_write;
}
}
function rng(max) {
return Math.floor(max * Math.random());
}
function createFunctionDecls(n, recurmax) {
if (--recurmax < 0) { return ';'; }
var s = '';
while (--n > 0) {
s += createFunctionDecl(recurmax) + '\n';
}
return s;
}
var funcs = 0;
function createFunctionDecl(recurmax) {
if (--recurmax < 0) { return ';'; }
var func = funcs++;
return 'function f' + func + '(){' + createStatements(3, recurmax) + '}\nf' + func + '();';
}
function createStatements(n, recurmax) {
if (--recurmax < 0) { return ';'; }
var s = '';
while (--n > 0) {
s += createStatement(recurmax);
}
return s;
}
var loops = 0;
function createStatement(recurmax) {
var loop = ++loops;
if (--recurmax < 0) { return ';'; }
switch (rng(7)) {
case 0:
return '{' + createStatement(recurmax) + '}';
case 1:
return 'if (' + createExpression(recurmax) + ')' + createStatement(recurmax);
case 2:
return '{var brake' + loop + ' = 5; do {' + createStatement(recurmax) + '} while ((' + createExpression(recurmax) + ') && --brake' + loop + ' > 0);}';
case 3:
return '{var brake' + loop + ' = 5; while ((' + createExpression(recurmax) + ') && --brake' + loop + ' > 0)' + createStatement(recurmax) + '}';
case 4:
return 'for (var brake' + loop + ' = 5; (' + createExpression(recurmax) + ') && brake' + loop + ' > 0; --brake' + loop + ')' + createStatement(recurmax);
case 5:
return ';';
case 6:
return createExpression() + ';';
}
}
function createExpression(recurmax) {
if (--recurmax < 0) { return '0'; }
switch (rng(8)) {
case 0:
return '(' + createUnaryOp() + 'a)';
case 1:
return '(a' + (Math.random() > 0.5 ? '++' : '--') + ')';
case 2:
return '(b ' + createAssignment() + ' a)';
case 3:
return '(' + Math.random() + ' > 0.5 ? a : b)';
case 4:
return createExpression(recurmax) + createBinaryOp() + createExpression(recurmax);
case 5:
return createValue();
case 6:
return '(' + createExpression(recurmax) + ')';
case 7:
return createExpression(recurmax) + '?(' + createExpression(recurmax) + '):(' + createExpression(recurmax) + ')';
}
}
function createValue() {
var values = [
'true',
'false',
'22',
'0',
'(-1)',
'NaN',
'undefined',
'null',
'"foo"',
'"bar"' ];
return values[rng(values.length)];
}
function createBinaryOp() {
switch (rng(6)) {
case 0:
return '+';
case 1:
return '-';
case 2:
return ',';
case 3:
return '&&';
case 4:
return '||';
case 5:
return '^';
}
}
function createAssignment() {
switch (rng(4)) {
case 0:
return '=';
case 1:
return '-=';
case 2:
return '^=';
case 3:
return '+=';
}
}
function createUnaryOp() {
switch (rng(4)) {
case 0:
return '--';
case 1:
return '++';
case 2:
return '~';
case 3:
return '!';
}
}
function log() {
console.log("//=============================================================");
console.log("// original code");
console.log("//");
console.log(original_code);
console.log();
console.log();
console.log("//-------------------------------------------------------------");
console.log("// original code (beautify'd)");
console.log("//");
console.log(beautify_code);
console.log();
console.log();
console.log("//-------------------------------------------------------------");
console.log("// uglified code");
console.log("//");
console.log(uglify_code);
console.log();
console.log();
console.log("original result:");
console.log(original_result);
console.log("beautified result:");
console.log(beautify_result);
console.log("uglified result:");
console.log(uglify_result);
}
var num_iterations = +process.argv[2] || 1/0;
var verbose = !!process.argv[3];
for (var round = 0; round < num_iterations; round++) {
process.stdout.write(round + " of " + num_iterations + "\r");
var original_code = [
"var a = 100, b = 10;",
createFunctionDecls(rng(3) + 1, 10),
"console.log(a, b);"
].join("\n");
var beautify_code = minify(original_code, {
fromString: true,
mangle: false,
compress: false,
output: {
beautify: true,
bracketize: true,
},
}).code;
var uglify_code = minify(beautify_code, {
fromString: true,
mangle: false,
compress: {
passes: 3,
},
output: {
beautify: true,
bracketize: true,
},
}).code;
var original_result = run_code(original_code);
var beautify_result = run_code(beautify_code);
var uglify_result = run_code(uglify_code);
var ok = original_result == beautify_result && original_result == uglify_result;
if (verbose || !ok) log();
if (!ok) process.exit(1);
}
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