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61 lines
3.4 KiB
61 lines
3.4 KiB
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
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<pkgmetadata>
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<herd>haskell</herd>
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<herd>proxy-maintainers</herd>
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<maintainer>
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<email>haskell@gentoo.org</email>
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</maintainer>
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<longdescription>
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This package provides a general purpose Haskell XML library using Expat to
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do its parsing (<http://expat.sourceforge.net/> - a fast stream-oriented XML
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parser written in C). It is extensible to any string type, with @String@,
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@ByteString@ and @Text@ provided out of the box.
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Basic usage: Parsing a tree (/Tree/), formatting a tree (/Format/).
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Other features: Helpers for processing XML trees (/Proc/), trees annotated with
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XML source location (/Annotated/), extended XML trees with comments,
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processing instructions, etc (/Extended/), XML cursors (/Cursor/),
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SAX-style parse (/SAX/), and access to the low-level interface in case speed
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is paramount (/Internal.IO/).
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The design goals are speed, speed, speed, interface simplicity and modularity.
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For introduction and examples, see the /Text.XML.Expat.Tree/ module. For benchmarks,
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<http://haskell.org/haskellwiki/Hexpat/>
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If you want to do interactive I\/O, an obvious option is to use lazy parsing
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with one of the lazy I\/O functions such as hGetContents. However, this can be
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problematic in some applications because it doesn't handle I\/O errors properly
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and can give no guarantee of timely resource cleanup. In these cases, chunked
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I\/O is a better approach: Take a look at the /hexpat-enumerator/ package.
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/IO/ is filed under /Internal/ because it's low-level and most users won't want
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it. The other /Internal/ modules are re-exported by /Annotated/, /Tree/ and /Extended/,
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so you won't need to import them directly.
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Credits to Iavor Diatchki and the @xml@ (XML.Light) package for /Proc/ and /Cursor/.
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Thanks to the many contributors.
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BOUND VS. UNBOUND THREADS: GHC (at least versions 6.12.X) will spawn threads
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if you call a safe FFI callback from an unbound thread. This can get out of
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control in a busy application. To avoid this, from version 0.19.1 we now delegate
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processing to a single worker thread if the calling thread is not bound.
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This essentially means that hexpat currently won't exploit multicores very well.
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It also means that hexpat may be more efficient on threads spawned with forkOS
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(to give you a bound thread) rather than forkIO.
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ChangeLog: 0.15 changes intended to fix a (rare) \"error: a C finalizer called back into Haskell.\"
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that seemed only to happen only on ghc6.12.X; 0.15.1 Fix broken Annotated parse;
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0.16 switch from mtl to transformers; 0.17 fix mapNodeContainer & rename some things.;
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0.18 rename defaultEncoding to overrideEncoding. 0.18.3 formatG and indent were demanding list
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items more than once (inefficient in chunked processing); 0.19 add Extended.hs;
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0.19.1 fix a memory leak introduced in 0.19, delegate parsing to bound thread
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if unbound (see note above); 0.19.2 include expat source code so \'cabal install\' just works
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on Linux, Mac and Windows (thanks Jacob Stanley); 0.19.3 fix misconfiguration of expat
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which broke entity parsing; 0.19.4 bump version constraint for text; 0.19.5 bump text
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to < 0.12 and fix text-0.10.0.1 breakage; 0.19.6 dependency breakage with List;
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0.19.7 ghc-7.2.1 compatibility; 0.19.8 fix space leak on lazy parse under ghc-7.2.1
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</longdescription>
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</pkgmetadata>
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