at-noder-converter
v1.1.1
Published
Tool to convert JavaScript files from the current Aria Templates class syntax to the new one introduced with the migration to noder-js.
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at-noder-converter
at-noder-converter allows to automatically convert JavaScript files from the current Aria Templates class syntax to the new one introduced with the migration to noder-js.
It can either be executed as a command line tool, or be integrated in a build process as an atpackager visitor.
Basic example
Here is a sample file using the current Aria Templates syntax (before the conversion):
Aria.classDefinition({
$classpath : "x.y.MyClass",
$dependencies : ["a.b.MyDependency1", "x.y.MyDependency2"],
$extends : "x.MyBaseClass",
$prototype : {
myMethod : function (myParam) {
return {
myDep1 : new a.b.MyDependency1(myParam),
myDep2 : new x.y.MyDependency2(myParam)
}
}
}
});
Here is the same file using the new syntax (after the conversion with at-noder-converter):
var Aria = require("ariatemplates/Aria");
var aBMyDependency1 = require("a/b/MyDependency1");
var xYMyDependency2 = require("./MyDependency2");
var xMyBaseClass = require("../MyBaseClass");
module.exports = Aria.classDefinition({
$classpath : "x.y.MyClass",
$extends : xMyBaseClass,
$prototype : {
myMethod : function (myParam) {
return {
myDep1 : new aBMyDependency1(myParam),
myDep2 : new xYMyDependency2(myParam)
}
}
}
});
Conversion process
at-noder-converter uses uglify-js to parse JavaScript files. In the abstract syntax tree, it looks for an Aria Templates definition, which is recognized by a call to one of the following methods:
Aria.classDefinition
Aria.interfaceDefinition
Aria.beanDefinitions
Aria.tplScriptDefinition
Inside the Aria Templates definition, at-noder-converter looks for dependencies, which can be found in the following properties:
$dependencies
$extends
$implements
$resources
$templates
$css
$macrolibs
$csslibs
$texts
$namespaces
It also looks for references to the Aria Templates bootstrap classes which are sometimes not declared in Aria Templates classes, as they are always available.
It then replaces each usage of the detected dependencies by a reference to a variable which is declared at
the top of the file, and initialized with a call to require
.
If both the file and its dependency are inside a common package (e.g. x.y.Z
and x.a.B
which are both
in the x
package), the path in the argument of the call to require
is relative to the current file
(e.g. ../a/B
). Otherwise (e.g. x.y.Z
and z.a.B
), the path in the argument of the call to require
is absolute (e.g. z/a/B
).
As much as possible, comments and code formatting from the original file are kept in the converted file.
Requirements
The input files to be converted by at-noder-converter must respect the following requirements:
The file should not use the
module
orrequire
global variables. (If those variables are used, it usually means that the file is already converted.)There must be exactly one call to one of the Aria Templates definition methods specified in the previous section. It is not possible to use at-noder-converter on a packaged file containing multiple Aria Templates definitions. Use at-noder-converter individually on each file before packaging them together.
The parameter of the Aria Templates definition function must be an object literal. For example, the following class cannot be converted by at-noder-converter, because the parameter of
Aria.classDefinition
is not an object literal but a reference to themyDefinition
variable:var myDefinition = { $classpath: "a.b.MyClass", $prototype: {} }; Aria.classDefinition(myDefinition);
But the following class can be converted by at-noder-converter:
Aria.classDefinition({ $classpath: "a.b.MyClass", $prototype: {} });
In a similar way, the
$classpath
property and all the properties which define dependencies in the Aria Templates definition (cf the list in the previous section) must have static literal values. For example, the following class cannot be converted by at-noder-converter because the$classpath
and the$dependencies
properties contain expressions and not literal values.var myPackage = "a.b."; Aria.classDefinition({ $classpath: myPackage + "MyClass", $dependencies: [myPackage + "MyOtherClass"], $prototype: {} });
But the following class can be converted by at-noder-converter:
Aria.classDefinition({ $classpath: "a.b.MyClass", $dependencies: ["a.b.MyOtherClass"], $prototype: {} });
Command line tool
This section explains how to use at-noder-converter as a command line tool.
Installation
Install at-noder-converter from the npm repository with:
npm install -g at-noder-converter
Usage
Once at-noder-converter is installed, it is possible to use it by simply passing the name of the file to convert. The converted file overwrites the corresponding original file.
For example, if MyClass.js
contains an Aria Templates class definition, use the following command
to convert it to the new syntax:
at-noder-converter MyClass.js
The MyClass.js
file now contains the updated class definition.
at-noder-converter can also convert multiple files in one command:
at-noder-converter MyClass1.js MyClass2.js MyClass3.js
Options
The following options can be used to change the behavior:
| Option | Description |
|---------------------------|-------------------------------------------------------------------------------------------------------------------------------------|
| --format
| Re-format the whole file instead of modifying parts of it. This can lose some comments. |
| --force-absolute-paths
| Always use absolute paths in calls to require()
even if the requiring and required file share some part of the classpath. |
| --simplify-single-usage
| If there is only one usage of a dependency, puts the call to require
where the dependency is used instead of creating a variable. |
| --replace-own-classpath
| If a class references itself by its own classpath, replaces this reference by module.exports
. |
You can also use --help
option to get the list of available options, and the --version
option to display the version of
at-noder-converter.
atpackager visitor
This section explains how to use at-noder-converter as an atpackager visitor, to be integrated in a build process.
Installation
Install at-noder-converter with npm, as a local dev dependency of your project:
npm install --save-dev at-noder-converter
In your Gruntfile.js
, include the following line:
require('atpackager').loadNpmPlugin('at-noder-converter');
It is now possible to add the ATNoderConverter
visitor to the list of visitors in the configuration
of atpackager.
Here is a sample Gruntfile.js
which uses at-noder-converter:
module.exports = function (grunt) {
grunt.initConfig({
atpackager: {
myBuild: {
options: {
sourceDirectories : ['src'],
sourceFiles: ["**/*"],
outputDirectory: "build",
visitors: ["ATNoderConverter"]
}
}
}
});
grunt.loadNpmTasks('atpackager');
require('atpackager').loadNpmPlugin('at-noder-converter');
grunt.registerTask('default', ['atpackager:myBuild']);
};
Configuration
When adding the ATNoderConverter
visitor to the visitors
array, it is possible to specify options
to change the way ATNoderConverter
behaves.
Here is an example, showing all the accepted configuration parameters, along with their default values:
visitors: [{
type: "ATNoderConverter",
cfg: {
files: ['**/*.js'],
ignoreErrors: ["alreadyConverted", "noAria"],
stringBased: true,
forceAbsolutePaths: false,
simplifySingleUsage: false,
replaceOwnClasspath: false
}
}]
Here is a description of each parameter:
files: array of file patterns to specify which files have to be converted.
ignoreErrors: array of error ids which, if they are raised, will not fail the build (the corresponding file will simply not be converted). Only two error ids can be ignored currently, and they are ignored by default, unless ignoreErrors is given another value:
alreadyConverted: this error happens if the file already uses 'module' or 'require'
noAria: this error happens if no Aria Templates definition is found in the file
stringBased: if this parameter is true (the default), and if this is possible (depending on previous visitors), the conversion happens both in the abstract syntax tree representation of the file and in the string version, allowing to keep file formatting and most comments. If this parameter is false, changes are only done in the abstract syntax tree, and no effort is made to keep formatting and comments.
forceAbsolutePaths: if this parameter is true, all the calls to
require()
will use absolute paths, even if the requiring and required file share some part of the classpath.simplifySingleUsage: if this parameter is true, if there is only one usage of a dependency, at-noder-converter puts the call to require where the dependency is used instead of creating a variable.
replaceOwnClasspath: if this parameter is true, if a class references itself by its own classpath, at-noder-converter replaces this reference by
module.exports
.