@kpi4me/golden-layout
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A multi-screen javascript Layout manager https://golden-layout.com
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JavaScript
/*
Copyright (C) 2013 Yusuke Suzuki <utatane.tea@gmail.com>
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*global exports:true*/
(function () {
'use strict';
var escope,
estraverse,
utility,
version,
assert,
Syntax,
Map;
escope = require('escope');
estraverse = require('estraverse');
utility = require('./utility');
Map = require('./map');
version = require('../package.json').version;
Syntax = estraverse.Syntax;
assert = function assert(cond, message) {
if (!cond) {
throw new Error(message);
}
};
if (version.indexOf('-dev', version.length - 4) === -1) {
assert = function () { };
}
function passAsUnique(scope, name) {
var i, iz;
if (utility.isKeyword(name) || utility.isRestrictedWord(name)) {
return false;
}
if (scope.taints.has(name)) {
return false;
}
for (i = 0, iz = scope.through.length; i < iz; ++i) {
if (scope.through[i].identifier.name === name) {
return false;
}
}
return true;
}
function generateName(scope, tip) {
do {
tip = utility.generateNextName(tip);
} while (!passAsUnique(scope, tip));
return tip;
}
function run(scope) {
var i, iz, j, jz, variable, name, def, ref;
if (scope.isStatic()) {
name = '9';
scope.variables.sort(function (a, b) {
if (a.tainted) {
return 1;
}
if (b.tainted) {
return -1;
}
return (b.identifiers.length + b.references.length) - (a.identifiers.length + a.references.length);
});
for (i = 0, iz = scope.variables.length; i < iz; ++i) {
variable = scope.variables[i];
if (variable.tainted) {
continue;
}
// Because `arguments` definition is nothing.
// But if `var arguments` is defined, identifiers.length !== 0
// and this doesn't indicate arguments.
if (variable.identifiers.length === 0) {
// do not change names because this is special name
continue;
}
name = generateName(scope, name);
for (j = 0, jz = variable.identifiers.length; j < jz; ++j) {
def = variable.identifiers[j];
// change definition's name
def.name = name;
}
for (j = 0, jz = variable.references.length; j < jz; ++j) {
ref = variable.references[j];
// change reference's name
ref.identifier.name = name;
}
}
}
}
function Label(node, upper) {
this.node = node;
this.upper = upper;
this.users = [];
this.names = new Map();
this.name = null;
}
Label.prototype.mangle = function () {
var tip, current, i, iz;
tip = '9';
// merge already used names
for (current = this.upper; current; current = current.upper) {
if (current.name !== null) {
this.names.set(current.name, true);
}
}
do {
tip = utility.generateNextName(tip);
} while (this.names.has(tip));
this.name = tip;
for (current = this.upper; current; current = current.upper) {
current.names.set(tip, true);
}
this.node.label.name = tip;
for (i = 0, iz = this.users.length; i < iz; ++i) {
this.users[i].label.name = tip;
}
};
function LabelScope(upper) {
this.map = new Map();
this.upper = upper;
this.label = null;
this.labels = [];
}
LabelScope.prototype.register = function register(node) {
var name;
assert(node.type === Syntax.LabeledStatement, 'node should be LabeledStatement');
this.label = new Label(node, this.label);
this.labels.push(this.label);
name = node.label.name;
assert(!this.map.has(name), 'duplicate label is found');
this.map.set(name, this.label);
};
LabelScope.prototype.unregister = function unregister(node) {
var name, ref;
if (node.type !== Syntax.LabeledStatement) {
return;
}
name = node.label.name;
ref = this.map.get(name);
this.map['delete'](name);
this.label = ref.upper;
};
LabelScope.prototype.resolve = function resolve(node) {
var name;
if (node.label) {
name = node.label.name;
assert(this.map.has(name), 'unresolved label');
this.map.get(name).users.push(node);
}
};
LabelScope.prototype.close = function close() {
var i, iz, label;
this.labels.sort(function (lhs, rhs) {
return rhs.users.length - lhs.users.length;
});
for (i = 0, iz = this.labels.length; i < iz; ++i) {
label = this.labels[i];
label.mangle();
}
return this.upper;
};
function mangleLabels(tree) {
var labelScope;
estraverse.traverse(tree, {
enter: function (node) {
if (escope.Scope.isVariableScopeRequired(node)) {
labelScope = new LabelScope(labelScope);
return;
}
switch (node.type) {
case Syntax.LabeledStatement:
labelScope.register(node);
break;
case Syntax.BreakStatement:
case Syntax.ContinueStatement:
labelScope.resolve(node);
break;
}
},
leave: function (node) {
labelScope.unregister(node);
if (escope.Scope.isVariableScopeRequired(node)) {
labelScope = labelScope.close();
}
}
});
return tree;
}
function mangle(tree, options) {
var result, manager, i, iz;
if (options == null) {
options = { destructive: true };
}
result = (options.destructive == null || options.destructive) ? tree : utility.deepCopy(tree);
manager = escope.analyze(result, { directive: true });
// mangling names
for (i = 0, iz = manager.scopes.length; i < iz; ++i) {
run(manager.scopes[i]);
}
// mangling labels
return mangleLabels(result);
}
exports.mangle = mangle;
exports.version = version;
exports.generateNextName = utility.generateNextName;
}());
/* vim: set sw=4 ts=4 et tw=80 : */