Class: Metal::Generator::Grammar

Inherits:
Object
  • Object
show all
Defined in:
lib/metal/generator.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name, body, base = nil, category = nil) ⇒ Grammar

Returns a new instance of Grammar.



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# File 'lib/metal/generator.rb', line 98

def initialize(name, body, base = nil, category = nil)
	@name = name
	@rules = []; @tokens = [], @precodes = []
	body.each {|b|
		if b.is_a?(Rule)
			@rules.push(b)
		elsif b.is_a?(Token)
			@tokens.push(b)
		else
			@precodes.push(b)
		end
	}
	@base = base
	@category = category
end

Instance Attribute Details

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/metal/generator.rb', line 161

def name
  @name
end

Instance Method Details

#category? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/metal/generator.rb', line 162

def category?
	@category != nil
end

#generate(ctx, source, header, rbcode) ⇒ Object

FIXME @tokens



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# File 'lib/metal/generator.rb', line 118

def generate(ctx, source, header, rbcode)
	ctx.grammar = self
	
	if @category
		header << "@interface #{@name} (#{@category})\n"
	else
		header << "@interface #{@name} : #{@base || 'MetalParserBase'}\n"
	end
	@rules.each {|rule|
		header << "-(VALUE)rule_#{rule.name}:(Metal::Context*)ctx;\n"
	}
	# FIXME token
	header << "@end\n"
	
	if @category
		source << "@implementation #{@name} (#{@category})\n"
	else
		source << "@implementation #{@name}\n"
	end
	@rules.each {|rule|
		source << "-(VALUE)rule_#{rule.name}:(Context*)ctx {\n"
			source << "return ({\n"
			rule.generate(ctx, source)
			source << "});\n"
		source << "}\n"
	}
	# FIXME token
	source << "@end\n"
	
	rbcode << "{\n"
		if @category
			rbcode << "VALUE c#{@name} = rb_const_get(rb_cKernel,rb_intern(\"#{@name}\"));\n"
		else
			rbcode << "VALUE c#{@name} = rb_define_class(\"#{@name}\", #{@base ? "rb_const_get(rb_cKernel,rb_intern(\"#{@base}\"))" : "cBase"});\n";
			rbcode << "rb_define_method(cMetalParser, \"parse\", (VALUE (*)(ANYARGS))(VALUE (*)(VALUE,VALUE))&Metal::parse_method_template<#{@name}>, 1);\n"
		end
		@precodes.each {|precode|
			code, code_len = Generator.escape_quoated_string(precode.code)
			rbcode << "code = rb_str_new(\"#{code}\",#{code_len});\n";
			rbcode << "rb_mod_module_eval(1,&code,c#{@name});\n"
		}
	rbcode << "}\n"
end

#preprocess(ctx) ⇒ Object 



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# File 'lib/metal/generator.rb', line 113

def preprocess(ctx)
	ctx.grammar = self
	@rules.each {|rules| rules.preprocess(ctx) }
	# FIXME @tokens
end