initStdIPairs method

void initStdIPairs()

Implementation

void initStdIPairs() {
  ipairs() {
    final t = findVar('table');

    if (!(t?.isTable ?? false)) {
      final type = t?.typeinfo;
      throw 'Expected table input for ipairs(...). Was $type.';
    }

    int i = 1;
    t as LuaObject;

    return LuaFuncBuilder
      .create('closure')
      .exec(call: () {
        if(i > t.tableSize) return null;
        final ii = i++;
        return [ii, t.readField(ii)];
    });
  }

  final token = Token.synthesized('ipairs');
  final defIPairs = FuncExpr.named(
    token,
    body: [],
    args: [DeclArg(Token.synthesized('table'))],
    idParts: [RawExpr(token)],
  );

  defGlobal(LuaObject.func('ipairs', defIPairs, ipairs)).doc = LuaDoc(
    category: catRuntime,
    html: '''
    Enumerates over a lua table and returns a <code>{index, value}</code>
    pair. Used in for-loops where integer index is expected.
    ''',
  );
}