Contents

require 'parslet'

module Shift
	module Parser
		include Parslet
		
		rule(:dot) { str(".") }
		rule(:comma) { str(",") }
		rule(:space) { str(" ") }
		rule(:space?) { space.maybe }

		rule(:colon) { str(":") }
		rule(:fwd_slash) { str("/") }
		
		rule(:single_quotes) { str("'") }
		rule(:double_quotes) { str('"') }

		rule(:lparen) { str("(") }
		rule(:rparen) { str(")") }

		rule(:left_square_bracket) { str('[') }
		rule(:right_square_bracket) { str(']') }

		rule(:integer) { match('[0-9]').repeat(1) }
		rule(:floating_point_number) { integer >> dot >> integer }

		rule(:number) { space? >> (floating_point_number | integer) >> space? }

		rule(:word) { space? >> match('[\w]').repeat(1) >> space? }

		rule :single_quoted_string do
			single_quotes >> 
			(
				(str('\\') >> any) |
				(single_quotes.absent? >> any)
			).repeat >> 
			single_quotes
	  	end

		rule :double_quoted_string do
			double_quotes >> 
			(
				(str('\\') >> any) |
				(double_quotes.absent? >> any)
			).repeat >> 
			double_quotes
	  	end
		rule(:string_value) { single_quoted_string | double_quoted_string }

		rule(:identifier) { match('[A-Za-z]') >> match['[A-Za-z0-9_]'].repeat(0) }

		rule(:hash_attribute) { string_value | identifier }
		rule(:hash_value) { identifier >> left_square_bracket >> hash_attribute >> right_square_bracket }

		rule(:object_value) { identifier >> dot >> identifier }

		rule(:variables) { space? >> (object_value.as(:object_value) | hash_value.as(:hash_value) | identifier.as(:identifier)) >> space? }

		rule(:string_valued_expression) { read_statement.as(:read_statement) | string_value.as(:string) | variables }

		rule(:numeric_value) { number | object_value | hash_value | identifier }

		rule(:simple_primitives) { space? >> (number | string_value | object_value | hash_value | identifier) >> space? }

		rule(:parenthesized_primitives) { lparen >> simple_primitives >> rparen }

		rule(:primitives) { parenthesized_primitives | simple_primitives }
	end
end

Version data entries

1 entries across 1 versions & 1 rubygems

Version	Path
shift-lang-0.1.1	lib/shift-lang/parser/token_parser.rb