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// Testing UglifyJS <-> SpiderMonkey AST conversion
// through generative testing.
var UglifyJS = require(".."),
escodegen = require("escodegen"),
esfuzz = require("esfuzz"),
estraverse = require("estraverse"),
prefix = "\r ";
// Normalizes input AST for UglifyJS in order to get correct comparison.
function normalizeInput(ast) {
return estraverse.replace(ast, {
enter: function(node, parent) {
switch (node.type) {
// Internally mark all the properties with semi-standard type "Property".
case "ObjectExpression":
node.properties.forEach(function (property) {
property.type = "Property";
});
break;
// Since UglifyJS doesn"t recognize different types of property keys,
// decision on SpiderMonkey node type is based on check whether key
// can be valid identifier or not - so we do in input AST.
case "Property":
var key = node.key;
if (key.type === "Literal" && typeof key.value === "string" && UglifyJS.is_identifier(key.value)) {
node.key = {
type: "Identifier",
name: key.value
};
} else if (key.type === "Identifier" && !UglifyJS.is_identifier(key.name)) {
node.key = {
type: "Literal",
value: key.name
};
}
break;
// UglifyJS internally flattens all the expression sequences - either
// to one element (if sequence contains only one element) or flat list.
case "SequenceExpression":
node.expressions = node.expressions.reduce(function flatten(list, expr) {
return list.concat(expr.type === "SequenceExpression" ? expr.expressions.reduce(flatten, []) : [expr]);
}, []);
if (node.expressions.length === 1) {
return node.expressions[0];
}
break;
}
}
});
}
module.exports = function(options) {
console.log("--- UglifyJS <-> Mozilla AST conversion");
for (var counter = 0; counter < options.iterations; counter++) {
process.stdout.write(prefix + counter + "/" + options.iterations);
var ast1 = normalizeInput(esfuzz.generate({
maxDepth: options.maxDepth
}));
var ast2 =
UglifyJS
.AST_Node
.from_mozilla_ast(ast1)
.to_mozilla_ast();
var astPair = [
{name: 'expected', value: ast1},
{name: 'actual', value: ast2}
];
var jsPair = astPair.map(function(item) {
return {
name: item.name,
value: escodegen.generate(item.value)
}
});
if (jsPair[0].value !== jsPair[1].value) {
var fs = require("fs");
var acorn = require("acorn");
fs.existsSync("tmp") || fs.mkdirSync("tmp");
jsPair.forEach(function (item) {
var fileName = "tmp/dump_" + item.name;
var ast = acorn.parse(item.value);
fs.writeFileSync(fileName + ".js", item.value);
fs.writeFileSync(fileName + ".json", JSON.stringify(ast, null, 2));
});
process.stdout.write("\n");
throw new Error("Got different outputs, check out tmp/dump_*.{js,json} for codes and ASTs.");
}
}
process.stdout.write(prefix + "Probability of error is less than " + (100 / options.iterations) + "%, stopping.\n");
};
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