40 lines
1.2 KiB
Ruby
40 lines
1.2 KiB
Ruby
module Imbecile
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# Class to generate the parser generator source.
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class Generator
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def initialize(grammar, log_file)
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@grammar = grammar
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@log_file = log_file
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end
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def generate(output_file)
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token_names = @grammar.tokens.each_with_object({}) do |token, token_names|
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if token_names.include?(token.name)
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raise Error.new("Duplicate token name #{token.name}")
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end
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token_names[token.name] = token
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end
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rule_names = @grammar.rules.each_with_object({}) do |rule, rule_names|
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if token_names.include?(rule.name)
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raise Error.new("Rule name collides with token name #{rule.name}")
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end
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rule_names[rule.name] ||= []
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rule_names[rule.name] << rule
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end
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unless rule_names["Start"]
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raise Error.new("Start rule not found")
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end
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lexer = Lexer.new(@grammar)
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classname = @grammar.classname || File.basename(output_file).sub(%r{[^a-zA-Z0-9].*}, "").capitalize
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erb = ERB.new(File.read(File.join(File.dirname(File.expand_path(__FILE__)), "../../assets/parser.d.erb")), nil, "<>")
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result = erb.result(binding.clone)
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File.open(output_file, "wb") do |fh|
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fh.write(result)
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end
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end
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end
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end
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