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Contents
module CodeRay
# = WordList
#
# <b>A Hash subclass designed for mapping word lists to token types.</b>
#
# A WordList is a Hash with some additional features.
# It is intended to be used for keyword recognition.
#
# WordList is optimized to be used in Scanners,
# typically to decide whether a given ident is a special token.
#
# For case insensitive words use WordList::CaseIgnoring.
#
# Example:
#
# # define word arrays
# RESERVED_WORDS = %w[
# asm break case continue default do else
# ]
#
# PREDEFINED_TYPES = %w[
# int long short char void
# ]
#
# # make a WordList
# IDENT_KIND = WordList.new(:ident).
# add(RESERVED_WORDS, :reserved).
# add(PREDEFINED_TYPES, :predefined_type)
#
# ...
#
# def scan_tokens tokens, options
# ...
#
# elsif scan(/[A-Za-z_][A-Za-z_0-9]*/)
# # use it
# kind = IDENT_KIND[match]
# ...
class WordList < Hash
# Create a new WordList with +default+ as default value.
def initialize default = false
super default
end
# Add words to the list and associate them with +value+.
#
# Returns +self+, so you can concat add calls.
def add words, value = true
words.each { |word| self[word] = value }
self
end
end
# A CaseIgnoring WordList is like a WordList, only that
# keys are compared case-insensitively (normalizing keys using +downcase+).
class WordList::CaseIgnoring < WordList
def [] key
super key.downcase
end
def []= key, value
super key.downcase, value
end
end
end
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