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Contents
# = TITLE:
#
# Text Filter
#
# = DESCRIPTION:
#
# Reusable class for filtering and rewriting strings.
#
# = AUTHORS:
#
# - George Moschovitis
# - Trans
module English #:nodoc:
class Filter
attr :rules
attr :word_rules
#
def initialize()
@rules = []
@word_rules = []
end
# Create new rule. A rule consists of a string or regexp
# to match against.
#
# NOTE: The rules must be applied in order! So we cannot
# use a hash because the ordering is not guaranteed. So
# an array is used instead.
def rule(match, &edit)
edit = lambda{''} unless edit
@rules << [match, edit]
end
# Rules that apply only to words. This takes the regular
# expression and add word boundry matches to either side.
#
# filter.word_rule(/damn/){ |w| 'darn' }
#
# Is equivalent to teh regular rule:
#
# filter.rule(/\bdamn\b/){ |w| 'darn' }
def word_rule(match, &edit)
edit = lambda{''} unless edit
@word_rules << [/\b#{match}\b/, edit]
end
# Apply the set of rules (regular expression matches) to
# a string.
def filter(string)
rewritten_string = string.dup
rules.each do |match,edit|
rewritten_string.gsub!(match,edit)
end
return (rewritten_string or string)
end
alias_method :apply, :filter
# Is the string clear of any matching rules?
#
# Note that running a filter does not necessarily clear a
# a string of all matches, since the filter could apply
# edits that would also match the filter expressions.
def censored?(string)
case string
when *matches
false
else
true
end
end
#
def matches
rules.collect{ |match, modify| match }
end
end
end
Version data entries
9 entries across 9 versions & 2 rubygems