Mercurial > projects > ldc
view tango/tango/text/stream/RegexIterator.d @ 132:1700239cab2e trunk
[svn r136] MAJOR UNSTABLE UPDATE!!!
Initial commit after moving to Tango instead of Phobos.
Lots of bugfixes...
This build is not suitable for most things.
author | lindquist |
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date | Fri, 11 Jan 2008 17:57:40 +0100 |
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/******************************************************************************* copyright: Copyright (c) 2004 Kris Bell. All rights reserved license: BSD style: $(LICENSE) version: Initial release: January 2006 author: Kris *******************************************************************************/ module tango.text.stream.RegexIterator; private import tango.text.Regex; private import tango.text.stream.StreamIterator; /******************************************************************************* Iterate across a set of text patterns. Each pattern is exposed to the client as a slice of the original content, where the slice is transient. If you need to retain the exposed content, then you should .dup it appropriately. These iterators are based upon the IBuffer construct, and can thus be used in conjunction with other Iterators and/or Reader instances upon a common buffer ~ each will stay in lockstep via state maintained within the IBuffer. The content exposed via an iterator is supposed to be entirely read-only. All current iterators abide by this rule, but it is possible a user could mutate the content through a get() slice. To enforce the desired read-only aspect, the code would have to introduce redundant copying or the compiler would have to support read-only arrays. See LineIterator, SimpleIterator, RegexIterator, QuotedIterator. *******************************************************************************/ class RegexIterator : StreamIterator!(char) { private Regex regex; private alias char T; /*********************************************************************** Construct an uninitialized iterator. For example: --- auto lines = new LineIterator!(char); void somefunc (IBuffer buffer) { foreach (line; lines.set(buffer)) Cout (line).newline; } --- Construct a streaming iterator upon a buffer: --- void somefunc (IBuffer buffer) { foreach (line; new LineIterator!(char) (buffer)) Cout (line).newline; } --- Construct a streaming iterator upon a conduit: --- foreach (line; new LineIterator!(char) (new FileConduit ("myfile"))) Cout (line).newline; --- ***********************************************************************/ this (T[] pattern, InputStream stream = null) { regex = new Regex (pattern, ""); super (stream); } /*********************************************************************** ***********************************************************************/ protected uint scan (void[] data) { auto content = (cast(T*) data.ptr) [0 .. data.length / T.sizeof]; if (regex.test (content)) { int start = regex.pmatch[0].rm_so; int finish = regex.pmatch[0].rm_eo; set (content.ptr, 0, start); return found (finish-1); } return notFound; } }