About

ChopChop script is a scripting language for Haxe. It can interface with Haxe code using runtime reflection.

Usage

var script:String = sys.io.File.getContent(path);
var lexer:ScriptLexer = new ScriptLexer(script);
var parser:ScriptParser = new ScriptParser(lexer);
var interp:ScriptInterp = new ScriptInterp();
trace(interp.interpret(parser.parse()));

For your own purposes you only need the src/script directory. This project also builds into an interpreter with the following usage:

Usage: ChopChop Interpreter
[source] -> the file to interpret -> expects: [path]
-[test] (-t) -> run tests and exit -> expects: []
ex: chopchop.exe test.cpcp
ex: chopchop.exe -t

You can download a pre-compiled version: https://github.com/Ohmnivore/ChopChopScript/releases

The language syntax is illustrated in the test suite directory (tests).

TODO

• import functions from other chop scripts
• enums
• resolve packages for classes: new script.ast.AST("", []);
• more robust syntax error reporting (match->[throw error if not expected token] instead of consume)
• turn inNest into an inObject bool

Notes

• enums are WIP
• Do while loop syntax: do while (CONDITION) {STATEMENTS}
• No ++ or -- operator
• No shorthand blocks: if (true) x = 10;
• No type checking
• No ... operator aka no for (0...10) style loops
• No class definitions
• No ternary operator (?:)
• No string interpolation
• No array or iterator comprehension (aka [while (i < 10) i++] && for (while (i < 10) i++))
• No conditional compilation
• No macros
• No switches
• No pattern matching
• No need for type casting

References

• https://en.wikipedia.org/wiki/Shunting-yard_algorithm
• http://www.amazon.ca/Language-Implementation-Patterns-Domain-Specific-Programming/dp/193435645X
• http://rosettacode.org/wiki/Parsing/Shunting-yard_algorithm
• https://www.klittlepage.com/2013/12/22/twelve-days-2013-shunting-yard-algorithm/
• http://en.cppreference.com/w/cpp/language/operator_precedence