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doc/go1: mention that regexp has changed

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Also restore alphabetical order.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/5701053
This commit is contained in:
Rob Pike 2012-02-27 14:34:16 +11:00
parent e10dc82ce0
commit cc7e11c91e
2 changed files with 84 additions and 56 deletions
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64
doc/go1.html
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@ -1702,6 +1702,39 @@ Code that uses the old POSIX error values from the <code>os</code> package
will fail to compile and will also need to be updated by hand.
</p>
<h3 id="os_signal">The os/signal package</h3>
<p>
The <code>os/signal</code> package in Go 1 replaces the
<code>Incoming</code> function, which returned a channel
that received all incoming signals,
with the selective <code>Notify</code> function, which asks
for delivery of specific signals on an existing channel.
</p>
<p>
<em>Updating</em>:
Code must be updated by hand.
A literal translation of
</p>
<pre>
c := signal.Incoming()
</pre>
<p>
is
</p>
<pre>
c := make(chan os.Signal)
signal.Notify(c) // ask for all signals
</pre>
<p>
but most code should list the specific signals it wants to handle instead:
</p>
<pre>
c := make(chan os.Signal)
signal.Notify(c, syscall.SIGHUP, syscall.SIGQUIT)
</pre>
<h3 id="path_filepath">The path/filepath package</h3>
<p>
@ -1747,38 +1780,19 @@ will need to be updated by hand.
The compiler will catch code using the old interface.
</p>
<h3 id="os_signal">The os/signal package</h3>
<h3 id="regexp">The regexp package</h3>
<p>
The <code>os/signal</code> package in Go 1 replaces the
<code>Incoming</code> function, which returned a channel
that received all incoming signals,
with the selective <code>Notify</code> function, which asks
for delivery of specific signals on an existing channel.
The <a href="/pkg/regexp/"><code>regexp</code></a> package has been rewritten.
It has the same interface but the specification of the regular expressions
it supports has changed from the old "egrep" form to that of
<a href="code.google.com/p/re2">RE2</a>.
</p>
<p>
<em>Updating</em>:
Code must be updated by hand.
A literal translation of
Code that uses the package should have its regular expressions checked by hand.
</p>
<pre>
c := signal.Incoming()
</pre>
<p>
is
</p>
<pre>
c := make(chan os.Signal)
signal.Notify(c) // ask for all signals
</pre>
<p>
but most code should list the specific signals it wants to handle instead:
</p>
<pre>
c := make(chan os.Signal)
signal.Notify(c, syscall.SIGHUP, syscall.SIGQUIT)
</pre>
<h3 id="runtime">The runtime package</h3>

76
doc/go1.tmpl
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@ -1601,37 +1601,6 @@ Code that uses the old POSIX error values from the <code>os</code> package
will fail to compile and will also need to be updated by hand.
</p>
<h3 id="path_filepath">The path/filepath package</h3>
<p>
In Go 1, the <a href="/pkg/path/filepath/#Walk"><code>Walk</code></a> function of the
<code>path/filepath</code> package
has been changed to take a function value of type
<a href="/pkg/path/filepath/#WalkFunc"><code>WalkFunc</code></a>
instead of a <code>Visitor</code> interface value.
<code>WalkFunc</code> unifies the handling of both files and directories.
</p>
<pre>
type WalkFunc func(path string, info os.FileInfo, err error) error
</pre>
<p>
The <code>WalkFunc</code> function will be called even for files or directories that could not be opened;
in such cases the error argument will describe the failure.
If a directory's contents are to be skipped,
the function should return the value <a href="/pkg/path/filepath/#variables"><code>filepath.SkipDir</code></a>
</p>
{{code "progs/go1.go" `/STARTWALK/` `/ENDWALK/`}}
<p>
<em>Updating</em>:
The change simplifies most code but has subtle consequences, so affected programs
will need to be updated by hand.
The compiler will catch code using the old interface.
</p>
<h3 id="os_signal">The os/signal package</h3>
<p>
@ -1665,6 +1634,51 @@ c := make(chan os.Signal)
signal.Notify(c, syscall.SIGHUP, syscall.SIGQUIT)
</pre>
<h3 id="path_filepath">The path/filepath package</h3>
<p>
In Go 1, the <a href="/pkg/path/filepath/#Walk"><code>Walk</code></a> function of the
<code>path/filepath</code> package
has been changed to take a function value of type
<a href="/pkg/path/filepath/#WalkFunc"><code>WalkFunc</code></a>
instead of a <code>Visitor</code> interface value.
<code>WalkFunc</code> unifies the handling of both files and directories.
</p>
<pre>
type WalkFunc func(path string, info os.FileInfo, err error) error
</pre>
<p>
The <code>WalkFunc</code> function will be called even for files or directories that could not be opened;
in such cases the error argument will describe the failure.
If a directory's contents are to be skipped,
the function should return the value <a href="/pkg/path/filepath/#variables"><code>filepath.SkipDir</code></a>
</p>
{{code "progs/go1.go" `/STARTWALK/` `/ENDWALK/`}}
<p>
<em>Updating</em>:
The change simplifies most code but has subtle consequences, so affected programs
will need to be updated by hand.
The compiler will catch code using the old interface.
</p>
<h3 id="regexp">The regexp package</h3>
<p>
The <a href="/pkg/regexp/"><code>regexp</code></a> package has been rewritten.
It has the same interface but the specification of the regular expressions
it supports has changed from the old "egrep" form to that of
<a href="code.google.com/p/re2">RE2</a>.
</p>
<p>
<em>Updating</em>:
Code that uses the package should have its regular expressions checked by hand.
</p>
<h3 id="runtime">The runtime package</h3>
<p>