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As preparation for https://bugs.ruby-lang.org/issues/20205 making sure the test suite is compatible with frozen string literals is making things easier.
100 lines
2.5 KiB
Ruby
100 lines
2.5 KiB
Ruby
# frozen_string_literal: true
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# 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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#
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# - The code must be a single line.
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#
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# - The code is basically Ruby code, even if it appears like in C and
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# the result will be processed as C. e.g., comments need to be in
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# Ruby style.
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class DSL
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TAG_PATTERN = /(?><[a-zA-Z0-9_]+>)/.source
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NAME_PATTERN = /(?>\$|\d+|[a-zA-Z_][a-zA-Z0-9_]*|\[[a-zA-Z_.][-a-zA-Z0-9_.]*\])(?>(?:\.|->)[a-zA-Z_][a-zA-Z0-9_]*)*/.source
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NOT_REF_PATTERN = /(?>\#.*|[^\"$@]*|"(?>\\.|[^\"])*")/.source
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def initialize(code, options, lineno = nil)
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@lineno = lineno
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@events = {}
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@error = options.include?("error")
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@brace = options.include?("brace")
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if options.include?("final")
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@final = "p->result"
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else
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@final = (options.grep(/\A\$#{NAME_PATTERN}\z/o)[0] || "p->s_lvalue")
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end
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@vars = 0
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# struct parser_params *p
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p = p = "p"
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@code = +""
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code = code.gsub(%r[\G#{NOT_REF_PATTERN}\K(\$|\$:|@)#{TAG_PATTERN}?#{NAME_PATTERN}]o, '"\&"')
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@last_value = eval(code)
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rescue SyntaxError
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$stderr.puts "error on line #{@lineno}" if @lineno
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raise
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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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if arg =~ /\A\$:#{NAME_PATTERN}\z/
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@code << "#{ v }=get_value(#{arg});"
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else
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@code << "#{ v }=#{ arg };"
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end
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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 }==rb_ripper_none ? #{ 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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