doc/rst2html: some few fixes for enumerated and bullet lists (#16295)

* fix bullet/enumarated lists with many blank lines
* fix enumerated list parsing
* fix parse failure when next line after list empty
* implement arbitrary start of enumerator
* check that enumerators are in order
* remove redundant start=x if x=1 or a
* add some doc on implemented features
* update start in rst_examples.rst
* allow upper-case letters + more docs

1 files changed, 8 insertions, 6 deletions

diff --git a/nimdoc/rst2html/expected/rst_examples.html b/nimdoc/rst2html/expected/rst_examples.html
index 0b9207688..a95fac0bd 100644
--- a/nimdoc/rst2html/expected/rst_examples.html
+++ b/nimdoc/rst2html/expected/rst_examples.html
@@ -274,15 +274,17 @@ stmt = IND{>} stmt ^+ IND{=} DED  # list of statements
 <li>An input parameter should not be aliased with a global or thread local variable updated by the called proc.</li>
 </ol>
 <p>One problem with rules 3 and 4 is that they affect specific global or thread local variables, but Nim's effect tracking only tracks &quot;uses no global variable&quot; via <tt class="docutils literal"><span class="pre">.noSideEffect</span></tt>. The rules 3 and 4 can also be approximated by a different rule:</p>
-<ol class="simple"><li>A global or thread local variable (or a location derived from such a location) can only passed to a parameter of a <tt class="docutils literal"><span class="pre">.noSideEffect</span></tt> proc.</li>
+<ol class="simple" start="5"><li>A global or thread local variable (or a location derived from such a location) can only passed to a parameter of a <tt class="docutils literal"><span class="pre">.noSideEffect</span></tt> proc.</li>
 </ol>
 <p>These two procs are the two modus operandi of the real-time garbage collector:</p>
-<p>(1) GC_SetMaxPause Mode</p>
-<blockquote><p>You can call <tt class="docutils literal"><span class="pre">GC_SetMaxPause</span></tt> at program startup and then each triggered garbage collector run tries to not take longer than <tt class="docutils literal"><span class="pre">maxPause</span></tt> time. However, it is possible (and common) that the work is nevertheless not evenly distributed as each call to <tt class="docutils literal"><span class="pre">new</span></tt> can trigger the garbage collector and thus take  <tt class="docutils literal"><span class="pre">maxPause</span></tt> time.</p></blockquote>
-<p>(2) GC_step Mode</p>
-<blockquote><p><p>This allows the garbage collector to perform some work for up to <tt class="docutils literal"><span class="pre">us</span></tt> time. This is useful to call in the main loop to ensure the garbage collector can do its work. To bind all garbage collector activity to a <tt class="docutils literal"><span class="pre">GC_step</span></tt> call, deactivate the garbage collector with <tt class="docutils literal"><span class="pre">GC_disable</span></tt> at program startup. If <tt class="docutils literal"><span class="pre">strongAdvice</span></tt> is set to <tt class="docutils literal"><span class="pre">true</span></tt>, then the garbage collector will be forced to perform the collection cycle. Otherwise, the garbage collector may decide not to do anything, if there is not much garbage to collect. You may also specify the current stack size via <tt class="docutils literal"><span class="pre">stackSize</span></tt> parameter. It can improve performance when you know that there are no unique Nim references below a certain point on the stack. Make sure the size you specify is greater than the potential worst-case size.</p>
+<ol class="simple"><li><p>GC_SetMaxPause Mode</p>
+<p>You can call <tt class="docutils literal"><span class="pre">GC_SetMaxPause</span></tt> at program startup and then each triggered garbage collector run tries to not take longer than <tt class="docutils literal"><span class="pre">maxPause</span></tt> time. However, it is possible (and common) that the work is nevertheless not evenly distributed as each call to <tt class="docutils literal"><span class="pre">new</span></tt> can trigger the garbage collector and thus take  <tt class="docutils literal"><span class="pre">maxPause</span></tt> time.</p>
+</li>
+<li><p>GC_step Mode</p>
+<p>This allows the garbage collector to perform some work for up to <tt class="docutils literal"><span class="pre">us</span></tt> time. This is useful to call in the main loop to ensure the garbage collector can do its work. To bind all garbage collector activity to a <tt class="docutils literal"><span class="pre">GC_step</span></tt> call, deactivate the garbage collector with <tt class="docutils literal"><span class="pre">GC_disable</span></tt> at program startup. If <tt class="docutils literal"><span class="pre">strongAdvice</span></tt> is set to <tt class="docutils literal"><span class="pre">true</span></tt>, then the garbage collector will be forced to perform the collection cycle. Otherwise, the garbage collector may decide not to do anything, if there is not much garbage to collect. You may also specify the current stack size via <tt class="docutils literal"><span class="pre">stackSize</span></tt> parameter. It can improve performance when you know that there are no unique Nim references below a certain point on the stack. Make sure the size you specify is greater than the potential worst-case size.</p>
 <p>It can improve performance when you know that there are no unique Nim references below a certain point on the stack. Make sure the size you specify is greater than the potential worst-case size.</p>
-</p></blockquote>
+</li>
+</ol>
 <p>These procs provide a &quot;best effort&quot; real-time guarantee; in particular the cycle collector is not aware of deadlines. Deactivate it to get more predictable real-time behaviour. Tests show that a 1ms max pause time will be met in almost all cases on modern CPUs (with the cycle collector disabled).</p>
 
 <h2><a class="toc-backref" id="code-reordering-time-measurement-with-garbage-collectors" href="#code-reordering-time-measurement-with-garbage-collectors">Time measurement with garbage collectors</a></h2><p>The garbage collectors' way of measuring time uses (see <tt class="docutils literal"><span class="pre">lib/system/timers.nim</span></tt> for the implementation):</p>