Esprima - What is that
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Esprima is a JavaScript parser that produces an abstract syntax tree (AST) from JavaScript code. The AST can then be traversed and analyzed to gather metadata and perform tasks like syntax validation, code completion, and instrumentation. Esprima supports ECMAScript 5.1 and below and can be used from browsers, Node.js, RequireJS, and other environments/packages. It parses code into a JSON AST and has options to customize the output.
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This document introduces JavaScript Parser, an infrastructure for code quality analysis. It describes building blocks of a JavaScript engine including a parser, syntax tree, and virtual machine. It discusses producing a correct syntax tree and handling syntax errors. Code quality tools like linting, formatting, and coverage are demonstrated using the parser. Future directions include scope analysis, refactoring helpers, and smarter editing aids.
Java OOP Concepts 1st Slide
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NOSQL and Cassandra
This document provides an introduction and overview of Cassandra and NoSQL databases. It discusses the challenges faced by modern web applications that led to the development of NoSQL databases. It then describes Cassandra's data model, API, consistency model, and architecture including write path, read path, compactions, and more. Key features of Cassandra like tunable consistency levels and high availability are also highlighted.
php&mysql with Ethical Hacking
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The document provides an introduction and overview of the Scala programming language presented by Prasanna Kumar at a JUG-C group meetup. It covers topics such as what Scala is, why use Scala, basics of Scala programming constructs, development environments, frameworks, and learning resources.
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STC 2016 Programming Language Storytime
This document provides an overview of how to interpret code to understand what a program is doing without running it. It discusses using code comments, function names, variable names, file locations, print functions, file names and other variables to understand the program's purpose. Specific programming languages are also discussed including examples of "Hello World" programs in Java, JavaScript, C, C#, PHP, Perl, Ruby and Python.
Raleigh Code Camp 2103 - .Net Metaprogramming Essentials
The document discusses metaprogramming and expression trees in .NET. Metaprogramming allows writing code that generates other code at runtime or compile-time. Expression trees in .NET represent code as data and can be compiled into delegates. The document provides an example of building an expression tree that multiplies a parameter by 2, compiling it into a function, and calling that function. It also briefly mentions other metaprogramming techniques in .NET like Reflection.Emit and Roslyn.
Scala Language Intro - Inspired by the Love Game
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Writing a REST Interconnection Library in Swift
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A Brief Overview of (Static) Program Query Languages
A brief introduction to some Program Query Languages and tools, part of a larger course on Programming Paradigms, taught at UCLouvain university in Belgium by Prof. Kim Mens.
Java Annotations
This presentation about annotation in java with short description how to build your custom annotations and execute them.
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2) The JVM defines runtime data areas like the heap, method area, and stacks that are used during program execution.
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Avro
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This LF Energy webinar took place June 20, 2024. It featured:
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Contact us: info@mydbops.com
Visit: https://www.mydbops.com/
Follow us on LinkedIn: https://in.linkedin.com/company/mydbops
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Meetup Page : https://www.meetup.com/mydbops-databa...
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Mutation Testing for Task-Oriented Chatbots
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Esprima - What is that
- 1. Esprima – What is that ? https://github.com/ariya/esprima http://esprima.org
- 2. What is Esprima Esprima is an ECMAScript parser written in ECMAScript (Javascript) Esprima produces a source tree of your JavaScript code (in json format), which in turn can be traversed to analyze the code for various aspects. Also static code analysis can be applied to give an insight to the code. It can help to determine meta information about the Javascript code. Full support for ECMAScript 5.1 - Any Javascript code written in EcmaScript 5.1 or below can be parsed throgh current version of Esprima(v1.0.4).
- 3. Availabilty Esprima is available: ✔ on Browser ✔ as a node package ✔ through module loader(RequireJS) ✔ as Bower component ✔ with Yeoman
- 4. Usage esprima.parse(code, options); This produces a sytax tree format that is compatible with Parser API of SpiderMonkey (Mozilla). Options parameter can be provided to generate the detailed syntax tree. esprima.tokenize(code, options); This produces an array of tokens used in JavaScript Program
- 5. Usage (parameters) code is the actual JavaScript code as string. options parameter can have following: loc - when true, nodes have line and column-based location info range - when true, nodes have an index-based location range (array) raw – when true, literals have extra property to store the verbatim source tokens – when true, an extra array is provided containing all found tokens comment – when true, an extra array is provided containing all line and block comments tolerant - when true, an extra array containing all errors found, attempts to continue parsing when an error is encountered All are set to false by default.
- 6. Example esprima.parse('var answer = 42;'); Outputs: { } "type": "Program", "body": [{ "type": "VariableDeclaration", "kind": "var", "declarations": [{ "type": "VariableDeclarator", "id": { "type": "Identifier", "name": "answer" }, "init": { "type": "Literal", "value": 42, "raw": "42" } }] }]
- 7. How can it help ● Check for general bad practices – – – ● Identify Double Negatives - component.setHidden(false); Identify declared, but not called functions; Identify code/comment ratio Tool to create utilities as: – – – Syntax validator Code Autocomplete Function Instrumentation
- 9. escodegen https://github.com/Constellation/escodegen escodegen generates the ecmascript code from Abstract Source Tree (the source tree generated from Esprima) escodegen.generate({ type: 'BinaryExpression', operator: '+', left: { type: 'Literal', value: 40 }, right: { type: 'Literal', value: 2 } }); produces the string '40 + 2'
- 10. Similar things ● acorn.js http://marijnhaverbeke.nl/acorn/ ● Traceur-compiler https://github.com/google/traceur-compiler Traceur is a JavaScript.next-to-JavaScript-of-today compiler ● ZeParser https://github.com/qfox/ZeParser ● Narcissus https://github.com/mozilla/narcissus ● UglifyJS 2 https://github.com/mishoo/UglifyJS2
- 11. References ● Esprima - http://esprima.org ● Presentation by Ariya Hidayat http://www.youtube.com/watch?v=ACYZFkvq0Sk ● Parser API by Mozilla https://developer.mozilla.org/en-US/docs/SpiderMonkey/Parser_API