Module: StringGlob

Defined in:
lib/stringglob.rb,
lib/stringglob/version.rb

Overview

Generate a Regexp object from a glob(3) pattern

Constant Summary collapse

IGNORE_CASE =

Ignore case.

1 << 0
STAR_MATCHES_LEADING_DOT =

Leading star ‘*’ matches leading dot ‘.’.

1 << 1
STAR_MATCHES_SLASH =

Star ‘*’ matches slash ‘/’.

1 << 2
VERSION =

:nodoc:

"0.0.4"

Class Method Summary collapse

Class Method Details

.regexp(glob, opt = 0, code = nil) ⇒ Object

Returns a Regex object which is the equivalent of the globbing pattern.



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# File 'lib/stringglob.rb', line 24

def regexp(glob, opt = 0, code = nil)
  re = regexp_string(glob, opt)
  return Regexp.new("\\A#{re}\\z", nil, code)
end

.regexp_string(glob, opt = 0) ⇒ Object

Returns a regexp String object which is the equivalent of the globbing pattern.



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# File 'lib/stringglob.rb', line 31

def regexp_string(glob, opt = 0)
  re_str = ''
  in_curlies = 0
  escaping = false
  first_byte = true
  asterisk = false
  star_matches_leading_dot = (opt & STAR_MATCHES_LEADING_DOT == 0)
  star_matches_slash = (opt & STAR_MATCHES_SLASH == 0)
  glob.scan(/./m) do |glob_c|
    if first_byte
	if star_matches_leading_dot
 re_str += '(?=[^.])' unless glob_c =~ /^[.{\[\\]$/
	end
	first_byte = false
    end
    if asterisk && glob_c != '*'
	re_str += star_matches_slash ? '[^/]*' : '.*'
	asterisk = false
    end
    if glob_c == '/'
	first_byte = true
    end
    if ('.()|+^$@%'.include?(glob_c))
	re_str += '\\' + glob_c
    elsif glob_c == '*'
	if escaping
 re_str += '\\*'
	elsif asterisk
 re_str += '.*'
 asterisk = false
	else
 asterisk = true
	end
    elsif glob_c == '?'
	re_str += escaping ? '\\?' :
 star_matches_slash ? '[^/]' : '.'
    elsif glob_c == '{'
	re_str += escaping ? '\\{' : '('
	in_curlies += 1 unless escaping
    elsif glob_c == '}' && in_curlies > 0
	re_str += escaping ? '}' : ')'
	in_curlies -= 1 unless escaping
    elsif glob_c == ',' && in_curlies > 0
	re_str += escaping ? ',' : '|'
    elsif glob_c == '\\'
	if escaping
 re_str += '\\\\'
 escaping = false
	else
 escaping = true
	end
	next
    else
	## Suppress warning: re_str has `}' without escape
	re_str += '\\' if glob_c == '}'
	re_str += glob_c
	escaping = false
    end
    escaping = false
  end
  if asterisk
    re_str += star_matches_slash ? '[^/]*' : '.*'
  end

  re_str = "(?i:#{re_str})" if (opt & IGNORE_CASE != 0)

  return re_str
end