A Hash subclass designed for mapping word lists to token types.
Copyright © 2006 by murphy (Kornelius Kalnbach)
License | LGPL / ask the author |
Version | 1.1 (2006-Oct-19) |
A WordList is a Hash with some additional features. It is intended to be used for keyword recognition.
WordList is highly optimized to be used in Scanners, typically to decide whether a given ident is a special token.
For case insensitive words use CaseIgnoringWordList.
Example:
# define word arrays RESERVED_WORDS = %w[ asm break case continue default do else ... ] PREDEFINED_TYPES = %w[ int long short char void ... ] PREDEFINED_CONSTANTS = %w[ EOF NULL ... ] # make a WordList IDENT_KIND = WordList.new(:ident). add(RESERVED_WORDS, :reserved). add(PREDEFINED_TYPES, :pre_type). add(PREDEFINED_CONSTANTS, :pre_constant) ... def scan_tokens tokens, options ... elsif scan(/[A-Za-z_][A-Za-z_0-9]*/) # use it kind = IDENT_KIND[match] ...
Creates a new WordList with default as default value.
You can activate caching to store the results for every [] request.
With caching, methods like include? or delete may no longer behave as you expect. Therefore, it is recommended to use the [] method only.
# File lib/coderay/helpers/word_list.rb, line 60 60: def initialize default = false, caching = false, &block 61: if block 62: raise ArgumentError, 'Can\t combine block with caching.' if caching 63: super(&block) 64: else 65: if caching 66: super() do |h, k| 67: h[k] = h.fetch k, default 68: end 69: else 70: super default 71: end 72: end 73: end
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