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logless.js
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logless.js
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var fs = require('fs');
var jsp = require('uglify-js').parser;
var pro = require('uglify-js').uglify;
// ------------------------------------------------------------------
// Public parsers
exports.parse = function(code, names, opts) {
return genCode(doParse(code, names), (opts || { }));
};
exports.parse.file = function(file, names, opts, callback) {
if (typeof opts === 'function' && callback == null) {
callback = opts;
opts = null;
}
fs.readFile(file, function(err, data) {
if (err) {
return callback(err);
}
try {
var result = exports.parse(String(data), names, opts);
callback(null, result);
} catch (e) {callback(e);}
});
};
exports.parse.fileSync = function(file, names, opts) {
return exports.parse(
String(fs.readFileSync(file)), names, opts
);
};
// ------------------------------------------------------------------
// Main parser
function doParse(code, names) {
names = new Blacklist(names);
var statement;
var walker = new Walker(getAst(code), function(node) {
switch (node.name) {
case 'toplevel':
// pass
break;
case 'var':
for (var i = 0; i < node.node[1].length; i++) {
var sub = node.node[1][i];
if (sub[1] && sub[1][0].name !== 'function') {
if (names.test(sub[1][1])) {
names.addToCurrentBlacklist(sub[0]);
node.node[1].splice(i--, 1);
}
}
}
if (! node.node[1].length) {
node.remove();
}
break;
case 'assign':
// TODO
break;
case 'stat':
statement = node;
break;
case 'call':
var sub = node.node[1];
switch (sub[0]) {
case 'function':
var argNames = sub[2];
var argValues = node.node[2];
var blacklist = [ ];
for (var i = 0; i < argValues.length; i++) {
if (names.test(argValues[i])) {
blacklist.push(argNames[i]);
argNames.splice(i, 1);
argValues.splice(i--, 1);
}
}
names.addBlacklist(blacklist);
node.after(function() {
names.removeCurrentBlacklist();
});
break;
case 'dot':
case 'name':
if (names.test(node.value[0])) {
statement.remove();
}
break;
}
break;
case 'unary-prefix':
default:
// pass
break;
}
});
walker.walk();
return walker.ast;
}
// ------------------------------------------------------------------
// AST Walker Constructor
function Walker(ast, onstep) {
this.ast = ast;
this.path = [ ];
this.onstep = onstep;
this.current = ast;
this.parents = [ ];
}
Walker.prototype.handleNode = function(node) {
if (Node.isNode(node)) {
node = new Node(node, this.parents.slice(-1)[0], this);
this.onstep.call(this, node);
}
};
Walker.prototype.walk = function() {
var node = this.handleNode(this.current);
if (Array.isArray(this.current)) {
var depth = this.path.length;
var parent = this.current;
this.parents.push(parent);
var previous = [ ];
for (var key = 0; key < parent.length; key++) {
this.path.push(key);
this.current = parent[key];
if (previous.indexOf(this.current) >= 0) {continue;}
previous.push(this.current);
this.walk();
if (this.path.length <= depth) {break;}
key = this.path.pop();
}
this.parents.pop();
this.current = parent;
}
if (node && node._after) {
node._after.call(this, node);
}
};
// ------------------------------------------------------------------
// AST Node Constructor
function Node(node, parent, walker) {
this.node = node;
this.parent = parent;
this.name = (typeof node[0] === 'object') ? node[0].name : node[0];
this.value = node.slice(1);
this.walker = walker;
this.depth = walker.path.length;
this._after = null;
}
Node.prototype.after = function(func) {
this._after = func;
};
Node.prototype.remove = function() {
this.walker.path.splice(this.depth);
this.parent.splice(this.walker.path[this.depth - 1]--, 1);
};
Node.isNode = function(node) {
return (
(node && node[0] === 'toplevel') || (
Array.isArray(node) && node[0] && (typeof node[0] === 'object') && node[0].name
)
);
};
Node.buildName = function() {
return buildName(this.node);
};
// ------------------------------------------------------------------
// Tests AST node structures against a blacklist of names
function Blacklist(names) {
this.blacklists = [ ];
this.names = names.slice();
}
Blacklist.prototype.test = function(node) {
var names = flattenArrays([ this.names, this.blacklists ]);
var testName = buildName(node);
if (! testName) {return false;}
if (names.indexOf(testName) >= 0) {return true;}
for (var i = 0, c = names.length; i < c; i++) {
if (testName.indexOf(names[i]) === 0 &&
(testName.length <= names[i].length || testName[names[i].length] === '.')
) {return true;}
}
return false;
};
Blacklist.prototype.addBlacklist = function(blacklist) {
this.blacklists.push(blacklist || [ ]);
};
Blacklist.prototype.addToCurrentBlacklist = function(name) {
name = Array.isArray(name) ? name : [name];
if (! this.blacklists.length) {
this.addBlacklist();
}
var current = this.blacklists.slice(-1)[0];
current.push.apply(current, name);
};
Blacklist.prototype.removeCurrentBlacklist = function() {
this.blacklists.pop();
};
// ------------------------------------------------------------------
// Utilities
function getAst(code) {
return jsp.parse(code, false, true);
}
function genCode(ast, opts) {
return pro.gen_code(ast,
merge({ }, {beautify: true}, opts)
);
}
function buildName(node, segments) {
segments = segments || [ ];
switch ((typeof node[0] === 'object' && node[0]) ? node[0].name : node[0]) {
case 'dot':
buildName(node[1], segments);
segments.push(node[2]);
break;
case 'name':
segments.push(node[1]);
break;
case 'call':
buildName(node[1], segments);
break;
case 'defun':
case 'function':
segments.push(node[1][0]);
break;
}
return segments.join('.');
}
function flattenArrays(arr) {
return arr.join(',').split(',');
}
function Log(foo, depth) {
console.log(
'\n' + require('util').inspect(foo, false, depth || 3) + '\n'
);
}
function merge(host, donor) {
for (var i = 1; i < arguments.length; i++) {
donor = arguments[i];
Object.keys(donor).forEach(function(key) {
host[key] = donor[key];
});
}
return host;
}
/* End of file logless.js */