| Title: Symbol State
Description: None
Copyright (c) 1999 Steven J. Metsker.
Copyright (c) 2001 The Open For Business Project - www.ofbiz.org
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The idea of a symbol is a character that stands on its
own, such as an ampersand or a parenthesis. For example,
when tokenizing the expression (isReady)&
(isWilling) , a typical tokenizer would return 7
tokens, including one for each parenthesis and one for
the ampersand. Thus a series of symbols such as
)&( becomes three tokens, while a series
of letters such as isReady becomes a single
word token.
Multi-character symbols are an exception to the rule
that a symbol is a standalone character. For example, a
tokenizer may want less-than-or-equals to tokenize as a
single token. This class provides a method for
establishing which multi-character symbols an object of
this class should treat as single symbols. This allows,
for example, "cat <= dog" to tokenize as
three tokens, rather than splitting the less-than and
equals symbols into separate tokens.
By default, this state recognizes the following multi-
character symbols: !=, :-, <=, >=
author:
Steven J. Metsker
version:
1.0 |
