Class: Metal::Generator::Expression

Inherits:

Object

• Object
• Metal::Generator::Expression

Defined in:

lib/metal/generator.rb

Instance Method Summary

• #generate(ctx, source) ⇒ Object
• #initialize(pred, iter, var) ⇒ Expression constructor

  A new instance of Expression.

• #preprocess(ctx) ⇒ Object

Constructor Details

#initialize(pred, iter, var) ⇒ Expression

Returns a new instance of Expression.

# File 'lib/metal/generator.rb', line 262

def initialize(pred, iter, var)
	@pred = pred
	@iter = iter
	@var = var
end

Instance Method Details

#generate(ctx, source) ⇒ Object

# File 'lib/metal/generator.rb', line 271

def generate(ctx, source)
	source << "env[PARAM_#{@var}] = ({\n" if @var
	if @iter
		obj = ctx.rule.with_lambda(source) {
			@pred.generate(ctx, source)
		}
		source << "ctx->act_#{@iter}(&#{obj});\n"
	else
		@pred.generate(ctx, source)
	end
	source << "});\n" if @var
end

#preprocess(ctx) ⇒ Object

# File 'lib/metal/generator.rb', line 267

def preprocess(ctx)
	ctx.register_var(@var) if @var
	@pred.preprocess(ctx)
end