module Rscons module Builders # Build a C or C++ source file given a lex (.l, .ll) or yacc (.y, .yy) # input file. # # Examples:: # env.CFile("parser.tab.cc", "parser.yy") # env.CFile("lex.yy.cc", "parser.ll") class CFile < Builder # Return default construction variables for the builder. # # @param env [Environment] The Environment using the builder. # # @return [Hash] Default construction variables for the builder. def default_variables(env) { "YACC" => "bison", "YACC_FLAGS" => ["-d"], "YACC_CMD" => ["${YACC}", "${YACC_FLAGS}", "-o", "${_TARGET}", "${_SOURCES}"], "YACCSUFFIX" => [".y", ".yy"], "LEX" => "flex", "LEX_FLAGS" => [], "LEX_CMD" => ["${LEX}", "${LEX_FLAGS}", "-o", "${_TARGET}", "${_SOURCES}"], "LEXSUFFIX" => [".l", ".ll"], } end # Run the builder to produce a build target. # # @param target [String] Target file name. # @param sources [Array] Source file name(s). # @param cache [Cache] The Cache object. # @param env [Environment] The Environment executing the builder. # @param vars [Hash,VarSet] Extra construction variables. # # @return [String,false] # Name of the target file on success or false on failure. def run(target, sources, cache, env, vars) vars = vars.merge({ "_TARGET" => target, "_SOURCES" => sources, }) cmd = case when sources.first.end_with?(*env.expand_varref("${LEXSUFFIX}")) "LEX" when sources.first.end_with?(*env.expand_varref("${YACCSUFFIX}")) "YACC" else raise "Unknown source file #{sources.first.inspect} for CFile builder" end command = env.build_command("${#{cmd}_CMD}", vars) standard_threaded_build("#{cmd} #{target}", target, command, sources, env, cache) end # Finalize a build. # # @param options [Hash] # Finalize options. # # @return [String, nil] # The target name on success or nil on failure. def finalize(options) standard_finalize(options) end end end end