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Introducing Enhanced Alert Actions and Triage Functionality
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ast-types
Advanced tools
Package description
The ast-types npm package is designed to define and manipulate ASTs (Abstract Syntax Trees) efficiently. It provides a flexible way to inspect, transform, and generate code from ASTs, which is particularly useful in the context of building compilers, code analysis tools, and code transformers.
Defining AST node types
This feature allows users to define various types of AST nodes. The code sample shows how to define an 'Identifier' and a 'BinaryExpression' node, specifying their structure and inheritance.
const def = require('ast-types').Type.def;
def('Identifier')
.bases('Node')
.build('name');
def('BinaryExpression')
.bases('Expression')
.build('operator', 'left', 'right');
Building AST nodes
This feature enables the construction of AST nodes using predefined builders. The code sample demonstrates creating a binary expression that adds two literals.
const builders = require('ast-types').builders;
const b = builders;
const ast = b.binaryExpression('+', b.literal(1), b.literal(2));
Visiting AST nodes
This feature provides a mechanism to traverse and manipulate nodes in an AST. The code sample illustrates how to visit all identifier nodes in an AST and log their names.
const visit = require('ast-types').visit;
const ast = require('./some-ast');
visit(ast, {
visitIdentifier(path) {
console.log('Found an identifier:', path.node.name);
this.traverse(path);
}
});
Similar to ast-types, babel-types is part of the Babel compiler ecosystem. It provides builders, validators, and converters for Babel's AST nodes. While ast-types is more generic and flexible, babel-types is specifically optimized for use with Babel's AST format.
Recast is built on top of ast-types and provides additional utilities for parsing, printing, and source map support. It leverages ast-types for node type definitions and manipulation, but extends its functionality with a focus on maintaining exact original formatting.
Readme
This module provides an efficient, modular, Esprima-compatible implementation of the abstract syntax tree type hierarchy pioneered by the Mozilla Parser API.
From NPM:
npm install ast-types
From GitHub:
cd path/to/node_modules
git clone git://github.com/benjamn/ast-types.git
cd ast-types
npm install .
var assert = require("assert");
var n = require("ast-types").namedTypes;
var b = require("ast-types").builders;
var fooId = b.identifier("foo");
var ifFoo = b.ifStatement(fooId, b.blockStatement([
b.expressionStatement(b.callExpression(fooId, []))
]));
assert.ok(n.IfStatement.check(ifFoo));
assert.ok(n.Statement.check(ifFoo));
assert.ok(n.Node.check(ifFoo));
assert.ok(n.BlockStatement.check(ifFoo.consequent));
assert.strictEqual(
ifFoo.consequent.body[0].expression.arguments.length,
0);
assert.strictEqual(ifFoo.test, fooId);
assert.ok(n.Expression.check(ifFoo.test));
assert.ok(n.Identifier.check(ifFoo.test));
assert.ok(!n.Statement.check(ifFoo.test));
The ast-types
module was designed to be extended. To that end, it
provides a readable, declarative syntax for specifying new AST node types,
based primarily upon the require("ast-types").Type.def
function:
var types = require("ast-types");
var def = types.Type.def;
var string = types.builtInTypes.string;
var b = types.builders;
// Suppose you need a named File type to wrap your Programs.
def("File")
.bases("Node")
.build("name", "program")
.field("name", string)
.field("program", def("Program"));
// Prevent further modifications to the File type (and any other
// types newly introduced by def(...)).
types.finalize();
// The b.file builder function is now available. It expects two
// arguments, as named by .build("name", "program") above.
var main = b.file("main.js", b.program([
// Pointless program contents included for extra color.
b.functionDeclaration(b.identifier("succ"), [
b.identifier("x")
], b.blockStatement([
b.returnStatement(
b.binaryExpression(
"+", b.identifier("x"), b.literal(1)
)
)
]))
]));
assert.strictEqual(main.name, "main.js");
assert.strictEqual(main.program.body[0].params[0].name, "x");
// etc.
// If you pass the wrong type of arguments, or fail to pass enough
// arguments, an AssertionError will be thrown.
b.file(b.blockStatement([]));
// ==> AssertionError: {"body":[],"type":"BlockStatement","loc":null} does not match type string
b.file("lib/types.js", b.thisExpression());
// ==> AssertionError: {"type":"ThisExpression","loc":null} does not match type Program
The def
syntax is used to define all the default AST node types found in
https://github.com/benjamn/ast-types/blob/master/lib/core.js,
https://github.com/benjamn/ast-types/blob/master/lib/es6.js,
https://github.com/benjamn/ast-types/blob/master/lib/mozilla.js,
https://github.com/benjamn/ast-types/blob/master/lib/e4x.js, and
https://github.com/benjamn/ast-types/blob/master/lib/xjs.js, so you have
no shortage of examples to learn from.
FAQs
Esprima-compatible implementation of the Mozilla JS Parser API
We found that ast-types demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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