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|
#
# rscan.rb
#
# Copyright (c) 2000,2001 Minero Aoki <aamine@loveruby.net>
#
# This program is free software.
# You can distribute/modify this program under the terms of
# the GNU General Public License version 2 or later.
#
class StringScanner_R
Version = '0.6.5'
def self.must_C_version
raise NotImplementedError, 'strscan is not C version'
end
def initialize( str, dup = true )
@rest = @str = dup ? str.dup : str
@str.freeze
@prev = nil
@last_match = nil
end
attr :last_match
def inspect
ret = "#<#{type} #{@str.size - @rest.size}/#{@str.size} "
pos = @str.size - @rest.size
if pos > 0 then
ret << ' '
beg = pos - 5
beg = 0 if beg < 0
ret << '"...' if beg > 0
ret << @str[beg..pos].inspect[1..-1]
end
ret << ' @'
unless @rest.empty? then
ret << ' ' << @rest[0,5].inspect
ret[-1,1] = '..."' if @rest.size > 5
end
ret << '>'
ret
end
def scan( re )
if m = re.match( @rest ) then
@last_match = m
@prev = @rest
@rest = m.post_match
m[0]
else
@last_match = @prev = nil
nil
end
end
def skip( re )
if m = re.match( @rest ) then
@last_match = m
@prev = @rest
@rest = m.post_match
@prev.size - @rest.size
else
@prev = nil
@last_match = nil
nil
end
end
def match?( re )
if m = re.match( @rest ) then
@last_match = m
@prev = @rest
m.end(0)
else
@prev = nil
@last_match = nil
nil
end
end
def check( re )
if m = re.match( @rest ) then
@last_match = m
@prev = @rest
@rest[ 0, m.end(0) ]
else
@prev = @last_match = nil
nil
end
end
def scan_until( re )
if skip re then
@last_match.pre_match + @last_match[0]
else
nil
end
end
alias skip_until skip
alias exist? match?
alias check_until check
def getch
scan( /./ )
end
def empty?
@rest.empty?
end
def rest?
not @rest.empty?
end
def rest
@rest.dup
end
def restsize
@rest.size
end
def matched?
not @last_match.nil?
end
def matched
@last_match[0]
end
def matchedsize
m = @last_match
m.end(0) - m.begin(0)
end
def [](n)
@last_match[n]
end
def string
@str
end
def string=( s )
@str = @rest = s
@prev = nil
end
def pointer
@str.size - @rest.size
end
def pointer=( i )
@rest = @str[ i, @str.size - i ]
end
def reset
@rest = @str
@prev = @last_match = nil
end
def clear
@rest = ''
@prev = @last_match = nil
end
def unscan
@prev or raise ScanError, 'cannot unscan: not scanned yet'
@rest = @prev
@prev = nil
end
end # class StringScanner_R
|
