check-code: catch Python 'is' comparing number or string literals
The Python 'is' operator compares object identity, so it should
definitely not be applied to string or number literals, which Python
implementations are free to represent with a temporary object.
This should catch the following kinds of bogus expressions (examples):
x is 'foo' x is not 'foo'
x is "bar" x is not "bar"
x is 42 x is not 42
x is -36 x is not -36
As originally proposed by Martin Geisler, amended with catching
negative numbers.
$ "$TESTDIR/hghave" pygments || exit 80
$ cat <<EOF >> $HGRCPATH
> [extensions]
> highlight =
> [web]
> pygments_style = friendly
> EOF
$ hg init test
$ cd test
create random Python file to exercise Pygments
$ cat <<EOF > primes.py
> #!/usr/bin/env python
>
> """Fun with generators. Corresponding Haskell implementation:
>
> primes = 2 : sieve [3, 5..]
> where sieve (p:ns) = p : sieve [n | n <- ns, mod n p /= 0]
> """
>
> from itertools import dropwhile, ifilter, islice, count, chain
>
> def primes():
> """Generate all primes."""
> def sieve(ns):
> p = ns.next()
> # It is important to yield *here* in order to stop the
> # infinite recursion.
> yield p
> ns = ifilter(lambda n: n % p != 0, ns)
> for n in sieve(ns):
> yield n
>
> odds = ifilter(lambda i: i % 2 == 1, count())
> return chain([2], sieve(dropwhile(lambda n: n < 3, odds)))
>
> if __name__ == "__main__":
> import sys
> try:
> n = int(sys.argv[1])
> except (ValueError, IndexError):
> n = 10
> p = primes()
> print "The first %d primes: %s" % (n, list(islice(p, n)))
> EOF
$ hg ci -Ama
adding primes.py
hg serve
$ hg serve -p $HGPORT -d -n test --pid-file=hg.pid -A access.log -E errors.log
$ cat hg.pid >> $DAEMON_PIDS
hgweb filerevision, html
$ ("$TESTDIR/get-with-headers.py" localhost:$HGPORT '/file/tip/primes.py') \
> | sed "s/class=\"k\"/class=\"kn\"/g" | sed "s/class=\"mf\"/class=\"mi\"/g"
200 Script output follows
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<div class="parity0 source"><a href="#l1" id="l1"> 1</a> <span class="c">#!/usr/bin/env python</span></div>
<div class="parity1 source"><a href="#l2" id="l2"> 2</a> </div>
<div class="parity0 source"><a href="#l3" id="l3"> 3</a> <span class="sd">"""Fun with generators. Corresponding Haskell implementation:</span></div>
<div class="parity1 source"><a href="#l4" id="l4"> 4</a> </div>
<div class="parity0 source"><a href="#l5" id="l5"> 5</a> <span class="sd">primes = 2 : sieve [3, 5..]</span></div>
<div class="parity1 source"><a href="#l6" id="l6"> 6</a> <span class="sd"> where sieve (p:ns) = p : sieve [n | n <- ns, mod n p /= 0]</span></div>
<div class="parity0 source"><a href="#l7" id="l7"> 7</a> <span class="sd">"""</span></div>
<div class="parity1 source"><a href="#l8" id="l8"> 8</a> </div>
<div class="parity0 source"><a href="#l9" id="l9"> 9</a> <span class="kn">from</span> <span class="nn">itertools</span> <span class="kn">import</span> <span class="n">dropwhile</span><span class="p">,</span> <span class="n">ifilter</span><span class="p">,</span> <span class="n">islice</span><span class="p">,</span> <span class="n">count</span><span class="p">,</span> <span class="n">chain</span></div>
<div class="parity1 source"><a href="#l10" id="l10"> 10</a> </div>
<div class="parity0 source"><a href="#l11" id="l11"> 11</a> <span class="kn">def</span> <span class="nf">primes</span><span class="p">():</span></div>
<div class="parity1 source"><a href="#l12" id="l12"> 12</a> <span class="sd">"""Generate all primes."""</span></div>
<div class="parity0 source"><a href="#l13" id="l13"> 13</a> <span class="kn">def</span> <span class="nf">sieve</span><span class="p">(</span><span class="n">ns</span><span class="p">):</span></div>
<div class="parity1 source"><a href="#l14" id="l14"> 14</a> <span class="n">p</span> <span class="o">=</span> <span class="n">ns</span><span class="o">.</span><span class="n">next</span><span class="p">()</span></div>
<div class="parity0 source"><a href="#l15" id="l15"> 15</a> <span class="c"># It is important to yield *here* in order to stop the</span></div>
<div class="parity1 source"><a href="#l16" id="l16"> 16</a> <span class="c"># infinite recursion.</span></div>
<div class="parity0 source"><a href="#l17" id="l17"> 17</a> <span class="kn">yield</span> <span class="n">p</span></div>
<div class="parity1 source"><a href="#l18" id="l18"> 18</a> <span class="n">ns</span> <span class="o">=</span> <span class="n">ifilter</span><span class="p">(</span><span class="kn">lambda</span> <span class="n">n</span><span class="p">:</span> <span class="n">n</span> <span class="o">%</span> <span class="n">p</span> <span class="o">!=</span> <span class="mi">0</span><span class="p">,</span> <span class="n">ns</span><span class="p">)</span></div>
<div class="parity0 source"><a href="#l19" id="l19"> 19</a> <span class="kn">for</span> <span class="n">n</span> <span class="ow">in</span> <span class="n">sieve</span><span class="p">(</span><span class="n">ns</span><span class="p">):</span></div>
<div class="parity1 source"><a href="#l20" id="l20"> 20</a> <span class="kn">yield</span> <span class="n">n</span></div>
<div class="parity0 source"><a href="#l21" id="l21"> 21</a> </div>
<div class="parity1 source"><a href="#l22" id="l22"> 22</a> <span class="n">odds</span> <span class="o">=</span> <span class="n">ifilter</span><span class="p">(</span><span class="kn">lambda</span> <span class="n">i</span><span class="p">:</span> <span class="n">i</span> <span class="o">%</span> <span class="mi">2</span> <span class="o">==</span> <span class="mi">1</span><span class="p">,</span> <span class="n">count</span><span class="p">())</span></div>
<div class="parity0 source"><a href="#l23" id="l23"> 23</a> <span class="kn">return</span> <span class="n">chain</span><span class="p">([</span><span class="mi">2</span><span class="p">],</span> <span class="n">sieve</span><span class="p">(</span><span class="n">dropwhile</span><span class="p">(</span><span class="kn">lambda</span> <span class="n">n</span><span class="p">:</span> <span class="n">n</span> <span class="o"><</span> <span class="mi">3</span><span class="p">,</span> <span class="n">odds</span><span class="p">)))</span></div>
<div class="parity1 source"><a href="#l24" id="l24"> 24</a> </div>
<div class="parity0 source"><a href="#l25" id="l25"> 25</a> <span class="kn">if</span> <span class="n">__name__</span> <span class="o">==</span> <span class="s">"__main__"</span><span class="p">:</span></div>
<div class="parity1 source"><a href="#l26" id="l26"> 26</a> <span class="kn">import</span> <span class="nn">sys</span></div>
<div class="parity0 source"><a href="#l27" id="l27"> 27</a> <span class="kn">try</span><span class="p">:</span></div>
<div class="parity1 source"><a href="#l28" id="l28"> 28</a> <span class="n">n</span> <span class="o">=</span> <span class="nb">int</span><span class="p">(</span><span class="n">sys</span><span class="o">.</span><span class="n">argv</span><span class="p">[</span><span class="mi">1</span><span class="p">])</span></div>
<div class="parity0 source"><a href="#l29" id="l29"> 29</a> <span class="kn">except</span> <span class="p">(</span><span class="ne">ValueError</span><span class="p">,</span> <span class="ne">IndexError</span><span class="p">):</span></div>
<div class="parity1 source"><a href="#l30" id="l30"> 30</a> <span class="n">n</span> <span class="o">=</span> <span class="mi">10</span></div>
<div class="parity0 source"><a href="#l31" id="l31"> 31</a> <span class="n">p</span> <span class="o">=</span> <span class="n">primes</span><span class="p">()</span></div>
<div class="parity1 source"><a href="#l32" id="l32"> 32</a> <span class="kn">print</span> <span class="s">"The first </span><span class="si">%d</span><span class="s"> primes: </span><span class="si">%s</span><span class="s">"</span> <span class="o">%</span> <span class="p">(</span><span class="n">n</span><span class="p">,</span> <span class="nb">list</span><span class="p">(</span><span class="n">islice</span><span class="p">(</span><span class="n">p</span><span class="p">,</span> <span class="n">n</span><span class="p">)))</span></div>
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hgweb fileannotate, html
$ ("$TESTDIR/get-with-headers.py" localhost:$HGPORT '/annotate/tip/primes.py') \
> | sed "s/class=\"k\"/class=\"kn\"/g" | sed "s/class=\"mi\"/class=\"mf\"/g"
200 Script output follows
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<h3>annotate primes.py @ 0:853dcd4de2a6</h3>
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<a href="/annotate/853dcd4de2a6/primes.py#1"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l1" id="l1"> 1</a> <span class="c">#!/usr/bin/env python</span></td>
</tr>
<tr class="parity1">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#2"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l2" id="l2"> 2</a> </td>
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<tr class="parity0">
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<a href="/annotate/853dcd4de2a6/primes.py#3"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l3" id="l3"> 3</a> <span class="sd">"""Fun with generators. Corresponding Haskell implementation:</span></td>
</tr>
<tr class="parity1">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#4"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l4" id="l4"> 4</a> </td>
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<tr class="parity0">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#5"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l5" id="l5"> 5</a> <span class="sd">primes = 2 : sieve [3, 5..]</span></td>
</tr>
<tr class="parity1">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#6"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l6" id="l6"> 6</a> <span class="sd"> where sieve (p:ns) = p : sieve [n | n <- ns, mod n p /= 0]</span></td>
</tr>
<tr class="parity0">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#7"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l7" id="l7"> 7</a> <span class="sd">"""</span></td>
</tr>
<tr class="parity1">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#8"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l8" id="l8"> 8</a> </td>
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<tr class="parity0">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#9"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l9" id="l9"> 9</a> <span class="kn">from</span> <span class="nn">itertools</span> <span class="kn">import</span> <span class="n">dropwhile</span><span class="p">,</span> <span class="n">ifilter</span><span class="p">,</span> <span class="n">islice</span><span class="p">,</span> <span class="n">count</span><span class="p">,</span> <span class="n">chain</span></td>
</tr>
<tr class="parity1">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#10"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l10" id="l10"> 10</a> </td>
</tr>
<tr class="parity0">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#11"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l11" id="l11"> 11</a> <span class="kn">def</span> <span class="nf">primes</span><span class="p">():</span></td>
</tr>
<tr class="parity1">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#12"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l12" id="l12"> 12</a> <span class="sd">"""Generate all primes."""</span></td>
</tr>
<tr class="parity0">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#13"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l13" id="l13"> 13</a> <span class="kn">def</span> <span class="nf">sieve</span><span class="p">(</span><span class="n">ns</span><span class="p">):</span></td>
</tr>
<tr class="parity1">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#14"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l14" id="l14"> 14</a> <span class="n">p</span> <span class="o">=</span> <span class="n">ns</span><span class="o">.</span><span class="n">next</span><span class="p">()</span></td>
</tr>
<tr class="parity0">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#15"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l15" id="l15"> 15</a> <span class="c"># It is important to yield *here* in order to stop the</span></td>
</tr>
<tr class="parity1">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#16"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l16" id="l16"> 16</a> <span class="c"># infinite recursion.</span></td>
</tr>
<tr class="parity0">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#17"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l17" id="l17"> 17</a> <span class="kn">yield</span> <span class="n">p</span></td>
</tr>
<tr class="parity1">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#18"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l18" id="l18"> 18</a> <span class="n">ns</span> <span class="o">=</span> <span class="n">ifilter</span><span class="p">(</span><span class="kn">lambda</span> <span class="n">n</span><span class="p">:</span> <span class="n">n</span> <span class="o">%</span> <span class="n">p</span> <span class="o">!=</span> <span class="mf">0</span><span class="p">,</span> <span class="n">ns</span><span class="p">)</span></td>
</tr>
<tr class="parity0">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#19"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l19" id="l19"> 19</a> <span class="kn">for</span> <span class="n">n</span> <span class="ow">in</span> <span class="n">sieve</span><span class="p">(</span><span class="n">ns</span><span class="p">):</span></td>
</tr>
<tr class="parity1">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#20"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l20" id="l20"> 20</a> <span class="kn">yield</span> <span class="n">n</span></td>
</tr>
<tr class="parity0">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#21"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l21" id="l21"> 21</a> </td>
</tr>
<tr class="parity1">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#22"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l22" id="l22"> 22</a> <span class="n">odds</span> <span class="o">=</span> <span class="n">ifilter</span><span class="p">(</span><span class="kn">lambda</span> <span class="n">i</span><span class="p">:</span> <span class="n">i</span> <span class="o">%</span> <span class="mf">2</span> <span class="o">==</span> <span class="mf">1</span><span class="p">,</span> <span class="n">count</span><span class="p">())</span></td>
</tr>
<tr class="parity0">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#23"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l23" id="l23"> 23</a> <span class="kn">return</span> <span class="n">chain</span><span class="p">([</span><span class="mf">2</span><span class="p">],</span> <span class="n">sieve</span><span class="p">(</span><span class="n">dropwhile</span><span class="p">(</span><span class="kn">lambda</span> <span class="n">n</span><span class="p">:</span> <span class="n">n</span> <span class="o"><</span> <span class="mf">3</span><span class="p">,</span> <span class="n">odds</span><span class="p">)))</span></td>
</tr>
<tr class="parity1">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#24"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l24" id="l24"> 24</a> </td>
</tr>
<tr class="parity0">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#25"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l25" id="l25"> 25</a> <span class="kn">if</span> <span class="n">__name__</span> <span class="o">==</span> <span class="s">"__main__"</span><span class="p">:</span></td>
</tr>
<tr class="parity1">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#26"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l26" id="l26"> 26</a> <span class="kn">import</span> <span class="nn">sys</span></td>
</tr>
<tr class="parity0">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#27"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l27" id="l27"> 27</a> <span class="kn">try</span><span class="p">:</span></td>
</tr>
<tr class="parity1">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#28"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l28" id="l28"> 28</a> <span class="n">n</span> <span class="o">=</span> <span class="nb">int</span><span class="p">(</span><span class="n">sys</span><span class="o">.</span><span class="n">argv</span><span class="p">[</span><span class="mf">1</span><span class="p">])</span></td>
</tr>
<tr class="parity0">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#29"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l29" id="l29"> 29</a> <span class="kn">except</span> <span class="p">(</span><span class="ne">ValueError</span><span class="p">,</span> <span class="ne">IndexError</span><span class="p">):</span></td>
</tr>
<tr class="parity1">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#30"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l30" id="l30"> 30</a> <span class="n">n</span> <span class="o">=</span> <span class="mf">10</span></td>
</tr>
<tr class="parity0">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#31"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l31" id="l31"> 31</a> <span class="n">p</span> <span class="o">=</span> <span class="n">primes</span><span class="p">()</span></td>
</tr>
<tr class="parity1">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#32"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l32" id="l32"> 32</a> <span class="kn">print</span> <span class="s">"The first </span><span class="si">%d</span><span class="s"> primes: </span><span class="si">%s</span><span class="s">"</span> <span class="o">%</span> <span class="p">(</span><span class="n">n</span><span class="p">,</span> <span class="nb">list</span><span class="p">(</span><span class="n">islice</span><span class="p">(</span><span class="n">p</span><span class="p">,</span> <span class="n">n</span><span class="p">)))</span></td>
</tr>
</table>
</div>
</div>
</div>
</body>
</html>
hgweb fileannotate, raw
$ ("$TESTDIR/get-with-headers.py" localhost:$HGPORT '/annotate/tip/primes.py?style=raw') \
> | sed "s/test@//" > a
$ echo "200 Script output follows" > b
$ echo "" >> b
$ echo "" >> b
$ hg annotate "primes.py" >> b
$ echo "" >> b
$ echo "" >> b
$ echo "" >> b
$ echo "" >> b
$ diff -u b a
$ echo
hgweb filerevision, raw
$ ("$TESTDIR/get-with-headers.py" localhost:$HGPORT '/file/tip/primes.py?style=raw') \
> > a
$ echo "200 Script output follows" > b
$ echo "" >> b
$ hg cat primes.py >> b
$ diff -u b a
$ echo
hgweb highlightcss friendly
$ "$TESTDIR/get-with-headers.py" localhost:$HGPORT '/highlightcss' > out
$ head -n 4 out
200 Script output follows
/* pygments_style = friendly */
$ rm out
errors encountered
$ cat errors.log
$ "$TESTDIR/killdaemons.py"
Change the pygments style
$ cat > .hg/hgrc <<EOF
> [web]
> pygments_style = fruity
> EOF
hg serve again
$ hg serve -p $HGPORT -d -n test --pid-file=hg.pid -A access.log -E errors.log
$ cat hg.pid >> $DAEMON_PIDS
hgweb highlightcss fruity
$ "$TESTDIR/get-with-headers.py" localhost:$HGPORT '/highlightcss' > out
$ head -n 4 out
200 Script output follows
/* pygments_style = fruity */
$ rm out
errors encountered
$ cat errors.log
$ cd ..
$ hg init eucjp
$ cd eucjp
$ python -c 'print("\265\376")' >> eucjp.txt # Japanese kanji "Kyo"
$ hg ci -Ama
adding eucjp.txt
$ hgserveget () {
> "$TESTDIR/killdaemons.py"
> echo % HGENCODING="$1" hg serve
> HGENCODING="$1" hg serve -p $HGPORT -d -n test --pid-file=hg.pid -E errors.log
> cat hg.pid >> $DAEMON_PIDS
>
> echo % hgweb filerevision, html
> "$TESTDIR/get-with-headers.py" localhost:$HGPORT "/file/tip/$2" \
> | grep '<div class="parity0 source">'
> echo % errors encountered
> cat errors.log
> }
$ hgserveget euc-jp eucjp.txt
% HGENCODING=euc-jp hg serve
% hgweb filerevision, html
<div class="parity0 source"><a href="#l1" id="l1"> 1</a> \xb5\xfe</div> (esc)
% errors encountered
$ hgserveget utf-8 eucjp.txt
% HGENCODING=utf-8 hg serve
% hgweb filerevision, html
<div class="parity0 source"><a href="#l1" id="l1"> 1</a> \xef\xbf\xbd\xef\xbf\xbd</div> (esc)
% errors encountered
$ hgserveget us-ascii eucjp.txt
% HGENCODING=us-ascii hg serve
% hgweb filerevision, html
<div class="parity0 source"><a href="#l1" id="l1"> 1</a> ??</div>
% errors encountered