JezK
Edit File: parsing_rule.rb
module Treetop module Compiler class ParsingRule < Runtime::SyntaxNode def compile(builder) compile_inline_module_declarations(builder) generate_method_definition(builder) end def compile_inline_module_declarations(builder) parsing_expression.inline_modules.each_with_index do |inline_module, i| inline_module.compile(i, builder, self) builder.newline end end def generate_method_definition(builder) builder.reset_addresses expression_address = builder.next_address result_var = "r#{expression_address}" builder.method_declaration(method_name) do builder.assign 'start_index', 'index' generate_cache_lookup(builder) builder.newline parsing_expression.compile(expression_address, builder) builder.newline generate_cache_storage(builder, result_var) builder.newline builder << result_var end end def generate_cache_lookup(builder) builder.if_ "node_cache[:#{name}].has_key?(index)" do cache_address = "node_cache[:#{name}][index]" builder.assign 'cached', cache_address builder.if_ "cached" do # Handle lazily instantiated nodes: builder << "#{cache_address} = cached = SyntaxNode.new(input, index...(index + 1)) if cached == true" builder << '@index = cached.interval.end' end builder << 'return cached' end end def generate_cache_storage(builder, result_var) builder.assign "node_cache[:#{name}][start_index]", result_var end def method_name "_nt_#{name}" end def name nonterminal.text_value end end end end