зеркало из https://github.com/github/ruby.git
* ext/strscan/strscan.c: merge documentation from 1.8 branch.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@5774 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
aamine
Родитель
fbac5a54a1
Коммит
6f77e4b4ba
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@ -1,8 +1,15 @@
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Thu Feb 19 02:37:28 2004 Minero Aoki <aamine@loveruby.net>
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* ext/strscan/strscan.c: merge documentation from 1.8 branch. Thanks Gavin Sinclair.
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Wed Feb 19 00:20:00 2004 Gavin Sinclair <gsinclair@soyabean.com.au>
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* lib/cgi-lib.rb: deprecated after 1.8.1
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* lib/getopts.rb: ditto
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* lib/importenv.rb: ditto
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* lib/parsearg.rb: ditto
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Thu Feb 19 00:11:05 2004 Dave Thomas <dave@pragprog.com>
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@ -123,7 +130,9 @@ Mon Feb 16 23:28:14 2004 NAKAMURA, Hiroshi <nakahiro@sarion.co.jp>
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Mon Feb 16 22:22:00 2004 Gavin Sinclair <gsinclair@soyabean.com.au>
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* lib/generator.rb: corrected doc format
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* lib/rinda/rinda.rb: added documentation (from Hugh Sasse)
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* lib/rinda/tuplespace.rb: ditto
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[Note: rinda files actually committed Wed Feb 18 07:27:00 2004]
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@ -194,6 +194,12 @@ strscan_s_allocate(klass)
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return Data_Wrap_Struct(klass, strscan_mark, strscan_free, p);
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}
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/*
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* call-seq: StringScanner.new(string, dup = false)
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*
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* Creates a new StringScanner object to scan over the given +string+.
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* +dup+ argument is obsolete and not used now.
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*/
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static VALUE
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strscan_initialize(argc, argv, self)
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int argc;
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@ -216,6 +222,11 @@ strscan_initialize(argc, argv, self)
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Instance Methods
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======================================================================= */
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/*
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* call-seq: StringScanner.must_C_version
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*
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* This method is defined for backward compatibility.
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*/
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static VALUE
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strscan_s_mustc(self)
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VALUE self;
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@ -223,6 +234,9 @@ strscan_s_mustc(self)
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return self;
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}
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/*
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* Reset the scan pointer (index 0) and clear matching data.
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*/
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static VALUE
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strscan_reset(self)
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VALUE self;
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@ -235,6 +249,13 @@ strscan_reset(self)
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return self;
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}
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/*
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* call-seq:
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* terminate
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* clear
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*
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* Set the scan pointer to the end of the string and clear matching data.
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*/
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static VALUE
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strscan_terminate(self)
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VALUE self;
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@ -247,6 +268,9 @@ strscan_terminate(self)
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return self;
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}
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/*
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* Returns the string being scanned.
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*/
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static VALUE
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strscan_clear(self)
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VALUE self;
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@ -265,6 +289,12 @@ strscan_get_string(self)
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return p->str;
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}
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/*
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* call-seq: string=(str)
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*
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* Changes the string being scanned to +str+ and resets the scanner.
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* Returns +str+.
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*/
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static VALUE
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strscan_set_string(self, str)
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VALUE self, str;
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@ -280,6 +310,20 @@ strscan_set_string(self, str)
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return str;
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}
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/*
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* call-seq:
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* concat(str)
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* <<(str)
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*
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* Appends +str+ to the string being scanned.
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* This method does not affect scan pointer.
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*
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* s = StringScanner.new("Fri Dec 12 1975 14:39")
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* s.scan(/Fri /)
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* s << " +1000 GMT"
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* s.string # -> "Fri Dec 12 1975 14:39 +1000 GMT"
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* s.scan(/Dec/) # -> "Dec"
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*/
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static VALUE
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strscan_concat(self, str)
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VALUE self, str;
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@ -292,6 +336,20 @@ strscan_concat(self, str)
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return self;
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}
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/*
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* Returns the position of the scan pointer. In the 'reset' position, this
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* value is zero. In the 'terminated' position (i.e. the string is exhausted),
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* this value is the length of the string.
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*
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* In short, it's a 1-based index into the string.
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*
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* s = StringScanner.new('test string')
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* s.pos # -> 0
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* s.scan_until /str/ # -> "test str"
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* s.pos # -> 8
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* s.terminate # -> #<StringScanner fin>
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* s.pos # -> 11
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*/
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static VALUE
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strscan_get_pos(self)
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VALUE self;
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@ -302,6 +360,15 @@ strscan_get_pos(self)
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return INT2FIX(p->curr);
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}
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/*
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* call-seq: pos=(n)
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*
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* Modify the scan pointer.
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*
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* s = StringScanner.new('test string')
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* s.pos = 7 # -> 7
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* s.rest # -> "ring"
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*/
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static VALUE
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strscan_set_pos(self, v)
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VALUE self, v;
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@ -371,6 +438,27 @@ strscan_do_scan(self, regex, succptr, getstr, headonly)
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}
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}
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/*
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* call-seq:
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* scanner.scan(pattern) => String
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*
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*/
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/*
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* call-seq: scan(pattern)
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*
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* Tries to match with +pattern+ at the current position. If there's a match,
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* the scanner advances the "scan pointer" and returns the matched string.
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* Otherwise, the scanner returns +nil+.
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*
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* s = StringScanner.new('test string')
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* p s.scan(/\w+/) # -> "test"
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* p s.scan(/\w+/) # -> nil
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* p s.scan(/\s+/) # -> " "
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* p s.scan(/\w+/) # -> "string"
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* p s.scan(/./) # -> nil
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*
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*/
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static VALUE
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strscan_scan(self, re)
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VALUE self, re;
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@ -378,6 +466,17 @@ strscan_scan(self, re)
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return strscan_do_scan(self, re, 1, 1, 1);
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}
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/*
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* call-seq: match?(pattern)
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*
|
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* Tests whether the given +pattern+ is matched from the current scan pointer.
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* Returns the length of the match, or +nil+. The scan pointer is not advanced.
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*
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* s = StringScanner.new('test string')
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* p s.match?(/\w+/) # -> 4
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||||
* p s.match?(/\w+/) # -> 4
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* p s.match?(/\s+/) # -> nil
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*/
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static VALUE
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strscan_match_p(self, re)
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VALUE self, re;
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@ -385,6 +484,23 @@ strscan_match_p(self, re)
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return strscan_do_scan(self, re, 0, 0, 1);
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}
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|
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/*
|
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* call-seq: skip(pattern)
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*
|
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* Attempts to skip over the given +pattern+ beginning with the scan pointer.
|
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* If it matches, the scan pointer is advanced to the end of the match, and the
|
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* length of the match is returned. Otherwise, +nil+ is returned.
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||||
*
|
||||
* It's similar to #scan, but without returning the matched string.
|
||||
*
|
||||
* s = StringScanner.new('test string')
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||||
* p s.skip(/\w+/) # -> 4
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||||
* p s.skip(/\w+/) # -> nil
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||||
* p s.skip(/\s+/) # -> 1
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||||
* p s.skip(/\w+/) # -> 6
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||||
* p s.skip(/./) # -> nil
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*
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||||
*/
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static VALUE
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strscan_skip(self, re)
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VALUE self, re;
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|
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@ -392,6 +508,21 @@ strscan_skip(self, re)
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return strscan_do_scan(self, re, 1, 0, 1);
|
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}
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|
||||
/*
|
||||
* call-seq: check(pattern)
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||||
*
|
||||
* This returns the value that #scan would return, without advancing the scan
|
||||
* pointer. The match register is affected, though.
|
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*
|
||||
* s = StringScanner.new("Fri Dec 12 1975 14:39")
|
||||
* s.check /Fri/ # -> "Fri"
|
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* s.pos # -> 0
|
||||
* s.matched # -> "Fri"
|
||||
* s.check /12/ # -> nil
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||||
* s.matched # -> nil
|
||||
*
|
||||
* Mnemonic: it "checks" to see whether a #scan will return a value.
|
||||
*/
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static VALUE
|
||||
strscan_check(self, re)
|
||||
VALUE self, re;
|
||||
|
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@ -399,6 +530,16 @@ strscan_check(self, re)
|
|||
return strscan_do_scan(self, re, 0, 1, 1);
|
||||
}
|
||||
|
||||
/*
|
||||
* call-seq: scan_full(pattern, return_string_p, advance_pointer_p)
|
||||
*
|
||||
* Tests whether the given +pattern+ is matched from the current scan pointer.
|
||||
* Returns the matched string if +return_string_p+ is true.
|
||||
* Advances the scan pointer if +advance_pointer_p+ is true.
|
||||
* The match register is affected.
|
||||
*
|
||||
* "full" means "#scan with full parameters".
|
||||
*/
|
||||
static VALUE
|
||||
strscan_scan_full(self, re, s, f)
|
||||
VALUE self, re, s, f;
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||||
|
|
@ -407,6 +548,18 @@ strscan_scan_full(self, re, s, f)
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|||
}
|
||||
|
||||
|
||||
/*
|
||||
* call-seq: scan_until(pattern)
|
||||
*
|
||||
* Scans the string _until_ the +pattern+ is matched. Returns the substring up
|
||||
* to and including the end of the match, advancing the scan pointer to that
|
||||
* location. If there is no match, +nil+ is returned.
|
||||
*
|
||||
* s = StringScanner.new("Fri Dec 12 1975 14:39")
|
||||
* s.scan_until(/1/) # -> "Fri Dec 1"
|
||||
* s.pre_match # -> "Fri Dec "
|
||||
* s.scan_until(/XYZ/) # -> nil
|
||||
*/
|
||||
static VALUE
|
||||
strscan_scan_until(self, re)
|
||||
VALUE self, re;
|
||||
|
|
@ -414,6 +567,19 @@ strscan_scan_until(self, re)
|
|||
return strscan_do_scan(self, re, 1, 1, 0);
|
||||
}
|
||||
|
||||
/*
|
||||
* call-seq: exist?(pattern)
|
||||
*
|
||||
* Looks _ahead_ to see if the +pattern+ exists _anywhere_ in the string,
|
||||
* without advancing the scan pointer. This predicates whether a #scan_until
|
||||
* will return a value.
|
||||
*
|
||||
* s = StringScanner.new('test string')
|
||||
* s.exist? /s/ # -> 3
|
||||
* s.scan /test/ # -> "test"
|
||||
* s.exist? /s/ # -> 6
|
||||
* s.exist? /e/ # -> nil
|
||||
*/
|
||||
static VALUE
|
||||
strscan_exist_p(self, re)
|
||||
VALUE self, re;
|
||||
|
|
@ -421,6 +587,22 @@ strscan_exist_p(self, re)
|
|||
return strscan_do_scan(self, re, 0, 0, 0);
|
||||
}
|
||||
|
||||
/*
|
||||
* call-seq: skip_until(pattern)
|
||||
*
|
||||
* Advances the scan pointer until +pattern+ is matched and consumed. Returns
|
||||
* the number of bytes advanced, or +nil+ if no match was found.
|
||||
*
|
||||
* Look ahead to match +pattern+, and advance the scan pointer to the _end_
|
||||
* of the match. Return the number of characters advanced, or +nil+ if the
|
||||
* match was unsuccessful.
|
||||
*
|
||||
* It's similar to #scan_until, but without returning the intervening string.
|
||||
*
|
||||
* s = StringScanner.new("Fri Dec 12 1975 14:39")
|
||||
* s.skip_until /12/ # -> 10
|
||||
* s #
|
||||
*/
|
||||
static VALUE
|
||||
strscan_skip_until(self, re)
|
||||
VALUE self, re;
|
||||
|
|
@ -428,6 +610,19 @@ strscan_skip_until(self, re)
|
|||
return strscan_do_scan(self, re, 1, 0, 0);
|
||||
}
|
||||
|
||||
/*
|
||||
* call-seq: check_until(pattern)
|
||||
*
|
||||
* This returns the value that #scan_until would return, without advancing the
|
||||
* scan pointer. The match register is affected, though.
|
||||
*
|
||||
* s = StringScanner.new("Fri Dec 12 1975 14:39")
|
||||
* s.check_until /12/ # -> "Fri Dec 12"
|
||||
* s.pos # -> 0
|
||||
* s.matched # -> 12
|
||||
*
|
||||
* Mnemonic: it "checks" to see whether a #scan_until will return a value.
|
||||
*/
|
||||
static VALUE
|
||||
strscan_check_until(self, re)
|
||||
VALUE self, re;
|
||||
|
|
@ -435,6 +630,15 @@ strscan_check_until(self, re)
|
|||
return strscan_do_scan(self, re, 0, 1, 0);
|
||||
}
|
||||
|
||||
/*
|
||||
* call-seq: search_full(pattern, return_string_p, advance_pointer_p)
|
||||
*
|
||||
* Scans the string _until_ the +pattern+ is matched.
|
||||
* Returns the matched string if +return_string_p+ is true, otherwise
|
||||
* returns the number of bytes advanced.
|
||||
* Advances the scan pointer if +advance_pointer_p+, otherwise not.
|
||||
* This method does affect the match register.
|
||||
*/
|
||||
static VALUE
|
||||
strscan_search_full(self, re, s, f)
|
||||
VALUE self, re, s, f;
|
||||
|
|
@ -457,6 +661,14 @@ adjust_registers_to_matched(p)
|
|||
p->regs.end[0] = p->curr - p->prev;
|
||||
}
|
||||
|
||||
/*
|
||||
* Scans one character and returns it.
|
||||
*
|
||||
* s = StringScanner.new('ab')
|
||||
* s.getch # => "a"
|
||||
* s.getch # => "b"
|
||||
* s.getch # => nil
|
||||
*/
|
||||
static VALUE
|
||||
strscan_getch(self)
|
||||
VALUE self;
|
||||
|
|
@ -480,6 +692,14 @@ strscan_getch(self)
|
|||
p->prev + p->regs.end[0]);
|
||||
}
|
||||
|
||||
/*
|
||||
* Scans one byte and returns it. Similar to, but not the same as, #getch.
|
||||
*
|
||||
* s = StringScanner.new('ab')
|
||||
* s.get_byte # => "a"
|
||||
* s.get_byte # => "b"
|
||||
* s.get_byte # => nil
|
||||
*/
|
||||
static VALUE
|
||||
strscan_get_byte(self)
|
||||
VALUE self;
|
||||
|
|
@ -507,7 +727,17 @@ strscan_getbyte(self)
|
|||
return strscan_get_byte(self);
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* call-seq: peek(len)
|
||||
*
|
||||
* Extracts a string corresponding to <tt>string[pos,len]</tt>, without
|
||||
* advancing the scan pointer.
|
||||
*
|
||||
* s = StringScanner.new('test string')
|
||||
* s.peek(7) # => "test st"
|
||||
* s.peek(7) # => "test st"
|
||||
*
|
||||
*/
|
||||
static VALUE
|
||||
strscan_peek(self, vlen)
|
||||
VALUE self, vlen;
|
||||
|
|
@ -526,6 +756,17 @@ strscan_peek(self, vlen)
|
|||
return extract_beg_len(p, p->curr, len);
|
||||
}
|
||||
|
||||
/*
|
||||
* Set the scan pointer to the previous position. Only one previous position is
|
||||
* remembered, and it changes with each scanning operation.
|
||||
*
|
||||
* s = StringScanner.new('test string')
|
||||
* s.scan(/\w+/) # => "test"
|
||||
* s.unscan
|
||||
* s.scan(/../) # => "te"
|
||||
* s.scan(/\d/) # => nil
|
||||
* s.unscan # ScanError: cannot unscan: prev match had failed
|
||||
*/
|
||||
static VALUE
|
||||
strscan_peep(self, vlen)
|
||||
VALUE self, vlen;
|
||||
|
|
@ -549,6 +790,18 @@ strscan_unscan(self)
|
|||
return self;
|
||||
}
|
||||
|
||||
/*
|
||||
* Returns +true+ iff the scan pointer is at the beginning of the line.
|
||||
*
|
||||
* s = StringScanner.new("test\ntest\n")
|
||||
* s.bol? # => true
|
||||
* s.scan(/te/)
|
||||
* s.bol? # => false
|
||||
* s.scan(/st\n/)
|
||||
* s.bol? # => true
|
||||
* s.terminate
|
||||
* s.bol? # => true
|
||||
*/
|
||||
static VALUE
|
||||
strscan_bol_p(self)
|
||||
VALUE self;
|
||||
|
|
@ -561,6 +814,16 @@ strscan_bol_p(self)
|
|||
return (*(CURPTR(p) - 1) == '\n') ? Qtrue : Qfalse;
|
||||
}
|
||||
|
||||
/*
|
||||
* Returns +true+ if the scan pointer is at the end of the string.
|
||||
*
|
||||
* s = StringScanner.new('test string')
|
||||
* p s.eos? # => false
|
||||
* s.scan(/test/)
|
||||
* p s.eos? # => false
|
||||
* s.terminate
|
||||
* p s.eos? # => true
|
||||
*/
|
||||
static VALUE
|
||||
strscan_eos_p(self)
|
||||
VALUE self;
|
||||
|
|
@ -574,14 +837,26 @@ strscan_eos_p(self)
|
|||
return Qfalse;
|
||||
}
|
||||
|
||||
/*
|
||||
* Equivalent to #eos?.
|
||||
* This method is obsolete, use #eos? instead.
|
||||
*/
|
||||
static VALUE
|
||||
strscan_empty_p(self)
|
||||
VALUE self;
|
||||
{
|
||||
rb_warning("StringScanner#empty_p is obsolete; use #eos? instead");
|
||||
rb_warning("StringScanner#empty? is obsolete; use #eos? instead");
|
||||
return strscan_eos_p(self);
|
||||
}
|
||||
|
||||
/*
|
||||
* Returns true iff there is more data in the string. See #eos?.
|
||||
* This method is obsolete; use #eos? instead.
|
||||
*
|
||||
* s = StringScanner.new('test string')
|
||||
* s.eos? # These two
|
||||
* s.rest? # are opposites.
|
||||
*/
|
||||
static VALUE
|
||||
strscan_rest_p(self)
|
||||
VALUE self;
|
||||
|
|
@ -595,7 +870,15 @@ strscan_rest_p(self)
|
|||
return Qtrue;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Returns +true+ iff the last match was successful.
|
||||
*
|
||||
* s = StringScanner.new('test string')
|
||||
* s.match?(/\w+/) # => 4
|
||||
* s.matched? # => true
|
||||
* s.match?(/\d+/) # => nil
|
||||
* s.matched? # => false
|
||||
*/
|
||||
static VALUE
|
||||
strscan_matched_p(self)
|
||||
VALUE self;
|
||||
|
|
@ -609,6 +892,13 @@ strscan_matched_p(self)
|
|||
return Qfalse;
|
||||
}
|
||||
|
||||
/*
|
||||
* Returns the last matched string.
|
||||
*
|
||||
* s = StringScanner.new('test string')
|
||||
* s.match?(/\w+/) # -> 4
|
||||
* s.matched # -> "test"
|
||||
*/
|
||||
static VALUE
|
||||
strscan_matched(self)
|
||||
VALUE self;
|
||||
|
|
@ -622,6 +912,16 @@ strscan_matched(self)
|
|||
p->prev + p->regs.end[0]);
|
||||
}
|
||||
|
||||
/*
|
||||
* Returns the size of the most recent match (see #matched), or +nil+ if there
|
||||
* was no recent match.
|
||||
*
|
||||
* s = StringScanner.new('test string')
|
||||
* s.check /\w+/ # -> "test"
|
||||
* s.matched_size # -> 4
|
||||
* s.check /\d+/ # -> nil
|
||||
* s.matched_size # -> nil
|
||||
*/
|
||||
static VALUE
|
||||
strscan_matched_size(self)
|
||||
VALUE self;
|
||||
|
|
@ -634,6 +934,20 @@ strscan_matched_size(self)
|
|||
return INT2NUM(p->regs.end[0] - p->regs.beg[0]);
|
||||
}
|
||||
|
||||
/*
|
||||
* call-seq: [](n)
|
||||
*
|
||||
* Return the n-th subgroup in the most recent match.
|
||||
*
|
||||
* s = StringScanner.new("Fri Dec 12 1975 14:39")
|
||||
* s.scan(/(\w+) (\w+) (\d+) /) # -> "Fri Dec 12 "
|
||||
* s[0] # -> "Fri Dec 12 "
|
||||
* s[1] # -> "Fri"
|
||||
* s[2] # -> "Dec"
|
||||
* s[3] # -> "12"
|
||||
* s.post_match # -> "1975 14:39"
|
||||
* s.pre_match # -> ""
|
||||
*/
|
||||
static VALUE
|
||||
strscan_aref(self, idx)
|
||||
VALUE self, idx;
|
||||
|
|
@ -655,6 +969,15 @@ strscan_aref(self, idx)
|
|||
p->prev + p->regs.end[i]);
|
||||
}
|
||||
|
||||
/*
|
||||
* Return the <i><b>pre</b>-match</i> (in the regular expression sense) of the last scan.
|
||||
*
|
||||
* s = StringScanner.new('test string')
|
||||
* s.scan(/\w+/) # -> "test"
|
||||
* s.scan(/\s+/) # -> " "
|
||||
* s.pre_match # -> "test"
|
||||
* s.post_match # -> "string"
|
||||
*/
|
||||
static VALUE
|
||||
strscan_pre_match(self)
|
||||
VALUE self;
|
||||
|
|
@ -667,6 +990,15 @@ strscan_pre_match(self)
|
|||
return extract_range(p, 0, p->prev + p->regs.beg[0]);
|
||||
}
|
||||
|
||||
/*
|
||||
* Return the <i><b>post</b>-match</i> (in the regular expression sense) of the last scan.
|
||||
*
|
||||
* s = StringScanner.new('test string')
|
||||
* s.scan(/\w+/) # -> "test"
|
||||
* s.scan(/\s+/) # -> " "
|
||||
* s.pre_match # -> "test"
|
||||
* s.post_match # -> "string"
|
||||
*/
|
||||
static VALUE
|
||||
strscan_post_match(self)
|
||||
VALUE self;
|
||||
|
|
@ -679,7 +1011,10 @@ strscan_post_match(self)
|
|||
return extract_range(p, p->prev + p->regs.end[0], S_LEN(p));
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Returns the "rest" of the string (i.e. everything after the scan pointer).
|
||||
* If there is no more data, it returns <tt>""</tt>.
|
||||
*/
|
||||
static VALUE
|
||||
strscan_rest(self)
|
||||
VALUE self;
|
||||
|
|
@ -693,6 +1028,9 @@ strscan_rest(self)
|
|||
return extract_range(p, p->curr, S_LEN(p));
|
||||
}
|
||||
|
||||
/*
|
||||
* <tt>s.rest_size</tt> is equivalent to <tt>s.rest.size</tt>.
|
||||
*/
|
||||
static VALUE
|
||||
strscan_rest_size(self)
|
||||
VALUE self;
|
||||
|
|
@ -709,10 +1047,20 @@ strscan_rest_size(self)
|
|||
return INT2FIX(i);
|
||||
}
|
||||
|
||||
|
||||
#define INSPECT_LENGTH 5
|
||||
#define BUFSIZE 256
|
||||
|
||||
/*
|
||||
* Returns a string that represents the StringScanner object, showing:
|
||||
* - the current position
|
||||
* - the size of the string
|
||||
* - the characters surrounding the scan pointer
|
||||
*
|
||||
* s = StringScanner.new("Fri Dec 12 1975 14:39")
|
||||
* s.inspect # -> '#<StringScanner 0/21 @ "Fri D...">'
|
||||
* s.scan_until /12/ # -> "Fri Dec 12"
|
||||
* s.inspect # -> '#<StringScanner 10/21 "...ec 12" @ " 1975...">'
|
||||
*/
|
||||
static VALUE
|
||||
strscan_inspect(self)
|
||||
VALUE self;
|
||||
|
|
@ -796,6 +1144,104 @@ inspect2(p)
|
|||
Ruby Interface
|
||||
======================================================================= */
|
||||
|
||||
/*
|
||||
* StringScanner provides for lexical scanning operations on a String. Here is
|
||||
* an example of its usage:
|
||||
*
|
||||
* s = StringScanner.new('This is an example string')
|
||||
* s.eos? # -> false
|
||||
*
|
||||
* p s.scan(/\w+/) # -> "This"
|
||||
* p s.scan(/\w+/) # -> nil
|
||||
* p s.scan(/\s+/) # -> " "
|
||||
* p s.scan(/\s+/) # -> nil
|
||||
* p s.scan(/\w+/) # -> "is"
|
||||
* s.eos? # -> false
|
||||
*
|
||||
* p s.scan(/\s+/) # -> " "
|
||||
* p s.scan(/\w+/) # -> "an"
|
||||
* p s.scan(/\s+/) # -> " "
|
||||
* p s.scan(/\w+/) # -> "example"
|
||||
* p s.scan(/\s+/) # -> " "
|
||||
* p s.scan(/\w+/) # -> "string"
|
||||
* s.eos? # -> true
|
||||
*
|
||||
* p s.scan(/\s+/) # -> nil
|
||||
* p s.scan(/\w+/) # -> nil
|
||||
*
|
||||
* Scanning a string means remembering the position of a <i>scan pointer</i>,
|
||||
* which is just an index. The scan pointer effectively points _between_
|
||||
* characters. (XXX: get this right - is it between or not?)
|
||||
*
|
||||
* Given the string "test string", here are the pertinent scan pointer
|
||||
* positions:
|
||||
*
|
||||
* t e s t s t r i n g
|
||||
* 0 1 2 ... 1
|
||||
* 0
|
||||
*
|
||||
* When you #scan for a pattern (a regular expression), the match must occur
|
||||
* at the character after the scan pointer. If you use #scan_until, then the
|
||||
* match can occur anywhere after the scan pointer. In both cases, the scan
|
||||
* pointer moves <i>just beyond</i> the last character of the match, ready to
|
||||
* scan again from the next character onwards. This is demonstrated by the
|
||||
* example above.
|
||||
*
|
||||
* == Method Categories
|
||||
*
|
||||
* There are other methods besides the plain scanners. You can look ahead in
|
||||
* the string without actually scanning. You can access the most recent match.
|
||||
* You can modify the string being scanned, reset or terminate the scanner,
|
||||
* find out or change the position of the scan pointer, skip ahead, and so on.
|
||||
*
|
||||
* === Advancing the Scan Pointer
|
||||
*
|
||||
* getch
|
||||
* getbyte
|
||||
* scan
|
||||
* scan_until
|
||||
* skip
|
||||
* skip_until
|
||||
*
|
||||
* === Looking Ahead
|
||||
*
|
||||
* check
|
||||
* check_until
|
||||
* exist?
|
||||
* match?
|
||||
* peek
|
||||
*
|
||||
* === Finding Where we Are
|
||||
*
|
||||
* bol?
|
||||
* eos?
|
||||
* pos
|
||||
*
|
||||
* === Setting Where we Are
|
||||
*
|
||||
* reset
|
||||
* terminate
|
||||
* pos=
|
||||
*
|
||||
* === Match Data
|
||||
*
|
||||
* matched
|
||||
* matched?
|
||||
* matched_size
|
||||
* []
|
||||
* pre_match
|
||||
* post_match
|
||||
*
|
||||
* === Miscellaneous
|
||||
*
|
||||
* <<
|
||||
* concat
|
||||
* string
|
||||
* string=
|
||||
* unscan
|
||||
*
|
||||
* There are aliases to several of the methods.
|
||||
*/
|
||||
void
|
||||
Init_strscan()
|
||||
{
|
||||
|
|
|
|||
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