esprima
escodegen
esprima | escodegen | |
---|---|---|
8 | 3 | |
6,962 | 2,620 | |
0.0% | 0.2% | |
0.0 | 1.2 | |
about 1 year ago | 27 days ago | |
TypeScript | JavaScript | |
BSD 2-clause "Simplified" License | BSD 2-clause "Simplified" License |
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esprima
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ESLint: under the hood
Focusing again on ESLint, the parser used by the linter is called Espree. This is an in-house parser built by the ESLint folks to fully support ECMAScript 6 and JSX on top of the already existing Esprima. The Espree module provide APIs for both tokenization and parsing that you can easily test out.
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Why you don’t need TypeScript
For TypeScript we have used AST transforms from their compiler API, and for plain JavaScript we did a similar thing using ESPrima. This helped us implement some simple optimizations like stream fusion (combining .filter and .map into a single operation) or avoiding extra object allocations in vector math, which led to nice performance improvements in code that does heavy computation (we process large amounts of data on the server and store results of physics simulations).
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Algorithm to simplify a 100-variable Boolean expression?
I used ESPrima, but any parser would do in this case. I then wrote a simple function to extract all "atomic" non-boolean expressions from it.
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How to make your own programming language in JavaScript
AST is an acronym for Abstract Syntax Tree. It's the way to represent code in a format that tools can understand. Usually in form of tree data structure. We will use AST in the format of an Esprima, which is a JavaScript parser that outputs AST.
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What the heck is an Abstract Syntax Tree (AST) ?
esprima
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Abstract Syntax Trees: They're Actually Used Everywhere -- But What Are They?
Create an AST: Esprima
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We Switched from Webpack to Vite
The thread was originally about CRA vs Vite size on disk (or implicitly, if we're applying it to real world applications, network cost in CI job startup times). And like I said, surrogate pairs don't apply to ASCII.
See this[0] for reference. Note how the first byte must fall within a certain range in order to signal being a surrogate pair. This fact is taken advantage of by JS parsers to make parsing of ASCII code faster by special casing that range, since checking for a valid character in the entire unicode range is quite a bit more expensive[1].
[0] https://github.com/jquery/esprima/blob/0911ad869928fd218371b...
[1] https://github.com/jquery/esprima/blob/0911ad869928fd218371b...
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How to create your own language that compile to JavaScript
If you want to learn more about parsing, reading the code of an actual recursive parser might be a better idea. Esprima is a decent place to start if you're interested in JS grammar. Then you can look at the babel handbook to learn more about AST transformations. From there, the literature gets quite a bit more heavy. If you get this far and are willing to push further, you'll probably want to grab yourself a copy of the dragon book at a minimum.
escodegen
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How to make your own programming language in JavaScript
What's cool about Esprima syntax is that there are tools that generate code based on their AST. An example is escodegen which takes Esprima AST as input and outputs JavaScript code. You can think that you can use just strings to generate code, but this solution will not scale. In this tutorial, I show only a single if statement but you will run into a lot of problems if you will have more complex code.
- Show HN: Monocle – bidirectional code generation library
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Abstract Syntax Trees: They're Actually Used Everywhere -- But What Are They?
Unparse the modified AST back into Javascript: Escodegen
What are some alternatives?
estree - The ESTree Spec
recast - JavaScript syntax tree transformer, nondestructive pretty-printer, and automatic source map generator
babel-handbook - :blue_book: A guided handbook on how to use Babel and how to create plugins for Babel.
espree - An Esprima-compatible JavaScript parser
estraverse - ECMAScript JS AST traversal functions
astring - 🌳 Tiny and fast JavaScript code generator from an ESTree-compliant AST.
esbuild-loader - Webpack loader for esbuild: Speed up your build ⚡️
vite-plugin-vue2 - Vue2 plugin for Vite
Visual Studio Code - Visual Studio Code
jquery.terminal - jQuery Terminal Emulator - JavaScript library for creating web-based terminals with custom commands