89 lines
1.9 KiB
Ruby
89 lines
1.9 KiB
Ruby
# Simple DSL implementation for Ripper code generation
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#
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# input: /*% ripper: stmts_add(stmts_new, void_stmt) %*/
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# output:
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# VALUE v1, v2;
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# v1 = dispatch0(stmts_new);
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# v2 = dispatch0(void_stmt);
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# $$ = dispatch2(stmts_add, v1, v2);
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$dollar = "$$"
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alias $$ $dollar
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class DSL
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def initialize(code, options)
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@events = {}
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@error = options.include?("error")
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@brace = options.include?("brace")
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if options.include?("final")
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@final = "p->result"
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else
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@final = (options.grep(/\A\$(?:\$|\d+)\z/)[0] || "$$")
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end
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@vars = 0
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# create $1 == "$1", $2 == "$2", ...
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s = (1..20).map {|n| "$#{n}"}
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re = Array.new(s.size, "([^\0]+)")
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/#{re.join("\0")}/ =~ s.join("\0")
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# struct parser_params *p
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p = p = "p"
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@code = ""
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@last_value = eval(code)
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end
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attr_reader :events
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undef lambda
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undef hash
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undef class
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def generate
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s = "#@code#@final=#@last_value;"
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s = "{VALUE #{ (1..@vars).map {|v| "v#{ v }" }.join(",") };#{ s }}" if @vars > 0
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s << "ripper_error(p);" if @error
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s = "{#{ s }}" if @brace
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"\t\t\t#{s}"
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end
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def new_var
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"v#{ @vars += 1 }"
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end
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def opt_event(event, default, addend)
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add_event(event, [default, addend], true)
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end
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def add_event(event, args, qundef_check = false)
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event = event.to_s.sub(/!\z/, "")
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@events[event] = args.size
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vars = []
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args.each do |arg|
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vars << v = new_var
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@code << "#{ v }=#{ arg };"
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end
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v = new_var
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d = "dispatch#{ args.size }(#{ [event, *vars].join(",") })"
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d = "#{ vars.last }==Qundef ? #{ vars.first } : #{ d }" if qundef_check
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@code << "#{ v }=#{ d };"
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v
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end
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def method_missing(event, *args)
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if event.to_s =~ /!\z/
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add_event(event, args)
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elsif args.empty? and /\Aid[A-Z_]/ =~ event.to_s
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event
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else
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"#{ event }(#{ args.join(", ") })"
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end
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end
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def self.const_missing(name)
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name
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end
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end
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