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Versions: 80
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Stored size: 1.49 KB
Contents
module Treetop
module Compiler
AUTOGENERATED = "# Autogenerated from a Treetop grammar. Edits may be lost.\n"
class GrammarCompiler
def compile(source_path, target_path = source_path.gsub(/\.(treetop|tt)\Z/, '.rb'))
File.open(target_path, 'w') do |target_file|
ruby = ruby_source(source_path)
if ruby =~ /\A#.*\n/
ruby.sub!(/\n/, "\n"+AUTOGENERATED+"\n\n")
else
ruby = AUTOGENERATED+"\n\n"+ruby
end
target_file.write(ruby)
end
end
# compile a treetop file into ruby
def ruby_source(source_path)
ruby_source_from_string(File.read(source_path))
end
# compile a string containing treetop source into ruby
def ruby_source_from_string(s)
parser = MetagrammarParser.new
result = parser.parse(s)
unless result
raise RuntimeError.new(parser.failure_reason)
end
result.compile
end
end
end
# compile a treetop source file and load it
def self.load(path)
adjusted_path = path =~ /\.(treetop|tt)\Z/ ? path : path + '.treetop'
File.open(adjusted_path) do |source_file|
source = source_file.read
source.gsub!(/\b__FILE__\b/, %Q{"#{adjusted_path}"})
load_from_string(source)
end
end
# compile a treetop source string and load it
def self.load_from_string(s)
compiler = Treetop::Compiler::GrammarCompiler.new
Object.class_eval(compiler.ruby_source_from_string(s))
end
end
Version data entries
80 entries across 76 versions & 21 rubygems