write-lua-ops.js

// Utility to write out the opcode mapping from `bytecode-table.js`
// as a Lua file
//
// Run it under `node` with the CLI in `bin/write-lua-ops.js`
define(['./bytecode-table'], function(bytecode_table) {
    var bops = [];
    while(true) {
        var bc = bytecode_table.for_num(bops.length);
        if (!bc) { break; }
        bops.push(bc);
    }
    var comma = function(i) { return (i < (bops.length-1)) ? ',' : ''; };
    var luaName = function(bc) {
        var name = bc.name.toUpperCase();
        if (name==='2DUP') { return 'DUP2'; }
        return name;
    };

    console.log('-- generated by TurtleScript write-lua-ops.js');
    console.log('');
    console.log('local ops = {}');
    console.log('');

    // ## Emit `Op` enumeration.
    console.log('ops.byname = {');
    bops.forEach(function(bc, i) {
        console.log('  ["' + luaName(bc) + '"] = ' + i + comma(i));
    });
    console.log('}');
    console.log('');

    console.log('ops.bynum = {}');
    console.log('');
    console.log('-- invert byname into bynum, and combine both into root export');
    console.log('for name,val in pairs(ops.byname) do');
    console.log('  ops.bynum[val] = name');
    console.log('  ops[name] = val');
    console.log('end');
    console.log('');

    console.log('return ops');
});