This is a naive JavaScript engine implemented in pure Rust to improve my JavaScript knowledge.

• Lexer
• Recursive descent parser with Operator Precedence Algorithm to optimize operators parsing
• Generates abstract syntax tree on basis of ESTree

• Generates bytecode(opcode) from AST
• Bytecode analysis
• Optimizes bytecode according to the analysis result

• Reference-counting GC with Mark-and-Sweep to deal with the reference cycle
• Common Flow Control Statements(if-else, for, while, do-while)
• Closure
• Mathematical Operations
• Function Invocation
• Logical Operations
• Bitwise Operations
• Object Literal
• New Expression
• Member Access Expression
• For-in Statement
• Switch Case Statement
• Try-catch Statement
• Debug

Thanks to the Rust development infrastructure, run this engine from source is very easy, just:

$ cargo build
$ cargo run your-script.js

It's still in development, after it’s completed I’d like to write a series of posts to describe how to build a JavaScript engine from scratch, stay tuned.

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