Inline `Array#reduce`

reduce.macro.sjs

macro inline_reduce {
  rule { ($list:expr, function ($accumulator:ident, $value:ident, $index:ident, $ref:ident) {
    $return:expr
  }, $context:expr) } => {
    (function ($ref) {
      var $accumulator = $ref.shift(), length = $ref.length;

      for (var $index = 0; $index < length; $index += 1) {
        var $value = $ref[$index];

        $accumulator = $return;
      }

      return $accumulator_symbol;
    }.call($context, $list))
  }
  rule { ($list:expr, function ($accumulator:ident, $value:ident, $index:ident, $ref:ident) {
    $return:expr
  }, $initial_value:expr, $context:expr) } => {
    (function ($ref, $accumulator) {
	var length = $ref.length;
	
      for (var $index = 0; $index < length; $index += 1) {
        var $value = $ref[$index];

        $accumulator = $return;
      }

      return $accumulator;
    }.call($context, $list, $initial_value))
  }
}

let reduce = macro {
	rule infix { $list:expr . | (() => $return:expr) } => {
		inline_reduce($list, function (value, index, ref) { $return }, this)
	}
	rule infix { $list:expr . | (() => $return:expr, $accumulator:expr) } => {
		inline_reduce($list, function (value, index, ref) { $return }, $accumulator, this)
	}
	rule infix { $list:expr . | ($value:ident => $return:expr) } => {
		inline_reduce($list, function ($value, index, ref) { $return }, this)
	}
	rule infix { $list:expr . | ($value:ident => $return:expr, $accumulator:expr) } => {
		inline_reduce($list, function ($value, index, ref) { $return }, $accumulator, this)
	}
	rule infix { $list:expr . | (($value:ident) => $return:expr) } => {
		inline_reduce($list, function ($value, index, ref) { $return }, this)
	}
	rule infix { $list:expr . | (($value:ident) => $return:expr, $accumulator:expr) } => {
		inline_reduce($list, function ($value, index, ref) { $return }, $accumulator, this)
	}
	rule infix { $list:expr . | (($value:ident, $index:ident) => $return:expr) } => {
		inline_reduce($list, function ($value, $index, ref) { $return }, this)
	}
	rule infix { $list:expr . | (($value:ident, $index:ident) => $return:expr, $accumulator:expr) } => {
		inline_reduce($list, function ($value, $index, ref) { $return }, $accumulator, this)
	}
	rule infix { $list:expr . | (($value:ident, $index:ident, $ref:ident) => $return:expr) } => {
		inline_reduce($list, function ($value, $index, $ref) { $return }, this)
	}
	rule infix { $list:expr . | (($value:ident, $index:ident, $ref:ident) => $return:expr, $accumulator:expr) } => {
		inline_reduce($list, function ($value, $index, $ref) { $return }, $accumulator, this)
	}
	rule { $rest ... } => { reduce $rest ... }
}

export reduceRight;