59 lines
1.7 KiB
Ruby
59 lines
1.7 KiB
Ruby
class Propane
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class Generator
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def initialize(grammar, output_file, log_file)
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@grammar = grammar
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@output_file = output_file
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@log_file = log_file
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@classname = @grammar.classname || File.basename(output_file).sub(%r{[^a-zA-Z0-9].*}, "").capitalize
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process_grammar!
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@lexer = Lexer.new(@grammar.tokens, @grammar.drop_tokens)
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@parser = Parser.new(@grammar.rule_sets)
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end
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def generate
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erb = ERB.new(File.read(File.join(File.dirname(File.expand_path(__FILE__)), "../../assets/parser.d.erb")), trim_mode: "<>")
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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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private
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def process_grammar!
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tokens_by_name = {}
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@grammar.tokens.each do |token|
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if tokens_by_name.include?(token.name)
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raise Error.new("Duplicate token name #{token.name.inspect}")
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end
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tokens_by_name[token.name] = token
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end
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@grammar.rule_sets.each do |rule_name, rule_set|
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if tokens_by_name.include?(rule_name)
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raise Error.new("Rule name collides with token name #{rule_name.inspect}")
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end
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end
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unless @grammar.rule_sets["Start"]
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raise Error.new("Start rule not found")
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end
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@grammar.rule_sets.each do |rule_name, rule_set|
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rule_set.rules.each do |rule|
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rule.components.map! do |component|
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if tokens_by_name[component]
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tokens_by_name[component]
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elsif @grammar.rule_sets[component]
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@grammar.rule_sets[component]
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else
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raise Error.new("Symbol #{component} not found")
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end
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end
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end
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end
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end
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end
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end
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