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