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Contents
# TITLE:
#
# String Scan-like Extensions
#
# SUMMARY:
#
# Extensions providing alternate methods akin to scanning.
#
# CREDIT:
#
# - Thomas Sawyer
#
class String
# Breaks a string up into an array based on a regular expression.
# Similar to scan, but includes the matches.
#
# s = "<p>This<b>is</b>a test.</p>"
# s.divide( /\<.*?\>/ )
#
# _produces_
#
# ["<p>This", "<b>is", "</b>a test.", "</p>"]
#
def divide( re )
re2 = /#{re}.*?(?=#{re}|\Z)/
scan(re2) #{re}(?=#{re})/)
end
# Like #scan but returns MatchData ($~) rather
# then matched string ($&).
#
def mscan(re) #:yield:
if block_given?
scan(re) { yield($~) }
else
m = []
scan(re) { m << $~ }
m
end
end
# Breaks a string up into an array based on a regular expression.
# Similar to scan, but includes the matches.
#
# s = "<p>This<b>is</b>a test.</p>"
# s.shatter( /\<.*?\>/ )
#
# _produces_
#
# ["<p>", "This", "<b>", "is", "</b>", "a test.", "</p>"]
#
def shatter( re )
r = self.gsub( re ){ |s| "\1" + s + "\1" }
while r[0,1] == "\1" ; r[0] = '' ; end
while r[-1,1] == "\1" ; r[-1] = '' ; end
r.split("\1")
end
end
# _____ _
# |_ _|__ ___| |_
# | |/ _ \/ __| __|
# | | __/\__ \ |_
# |_|\___||___/\__|
#
=begin test
require 'test/unit'
class TestStringScan < Test::Unit::TestCase
def test_mscan
r = 'abc,def,gh'.mscan(/[,]/)
assert( r.all?{ |md| MatchData === md } )
assert_equal( 2, r.to_a.length )
assert_equal( ',', r[0][0] )
assert_equal( ',', r[1][0] )
end
def test_divide
s = "<p>This<b>is</b>a test.</p>"
d = s.divide( /<.*?>/ )
e = ["<p>This", "<b>is", "</b>a test.", "</p>"]
assert_equal(e, d)
end
def test_shatter
s = "<p>This<b>is</b>a test.</p>"
sh = s.shatter( /<.*?>/ )
e = ["<p>", "This", "<b>", "is", "</b>", "a test.", "</p>"]
assert_equal(e, sh)
end
end
=end
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