EPICS_driver_modules/StreamDevice
0
0
Fork 0
Code Issues Pull Requests 1 Actions Packages Projects Releases Wiki Activity

regsub converter added

Browse Source
This commit is contained in:
zimoch
2016-06-14 11:36:36 +02:00
parent 126da8c499
commit 2ca8a129f7
3 changed files with 216 additions and 32 deletions
Download Patch File Download Diff File Expand all files Collapse all files

57
doc/formats.html
View File

@ -528,7 +528,7 @@ In input, the next byte or bytes must match the checksum.
</dl>
<a name="regex"></a>
<h2>12. Regular Expresion STRING Converter (<code>%/<em>regex</em>/</code>)</h2>
<h2>13. Regular Expresion STRING Converter (<code>%/<em>regex</em>/</code>)</h2>
<p>
This input-only format matches <a target="ex"
href="http://www.pcre.org/" >Perl compatible regular expressions (PCRE)</a>.
@ -569,9 +569,60 @@ Example: <code>%.1/&lt;title&gt;(.*)&lt;\/title&gt;/</code> returns
the title of an HTML page, skipps anything before the
<code>&lt;title&gt</code> tag and leaves anything after the
<code>&lt;/title&gt;</code> tag in the input buffer.
</p>
<a name="regsub"></a>
<h2>14. Regular Expresion Substitution Pseudo-Converter (<code>%#/<em>regex</em>/<em>subst</em>/</code>)</h2>
<p>
This is a variant of the previous converter (note the <code>#</code>)
but instead of returning the matching string,
it can be used as a pre-processor for input or
as a post-processor for output.
</p>
<p>
Any match of the <em>regex</em> is replaced by the string <em>subst</em> with any
<code>&</code> or <code>\0</code> in <em>subst</em> replaced with the match itself and any
<code>\1</code> through <code>\9</code> with the corresponding sub-expressions.
To get a literal <code>&</code> or <code>\</code> in the substitution write
<code>\&</code> or <code>\\</code>.
</p>
<p>
If <em>width</em> is specified, it limits the number of characters processed.
If the <code>-</code> flag is used (i.e. <em>width</em> looks like a negative number)
only the last <em>width</em> caracters are processed, else the first.
Without <em>width</em> all available characters are processed.
</p>
<p>
If <em>prec</em> is specified, it limits the number of times the substitution is applied.
Without <em>prec</em>, the substitution is applied as often as possible.
</p>
<p>
In input this converter pre-processes data received from the device before
other converters after this one read it.
Converters before this one will see unmodified input.
Thus place this converter before those whose input should be pre-processed.
</p>
<p>
In output it post-processes data already formatted by other converters before this one
before sending it to the device.
Converters after this one will send their output unmodified.
Thus place this converter after those whose output should be post-processed.
</p>
<p>
Examples:<br>
<code>%#-10.2/ab/X/</code> replaces the string <code>ab</code> with <code>X</code>
maximal 2 times in the last 10 characters.
(<code>abcabcabcabc</code> becomes <code>abcXcXcabc</code>)<br>
<code>%#/..\B/&:/</code> writes <code>:</code> after every second character
which is not at the end of a word.
(<code>0b19353134</code> becomes <code>0b:19:35:31:34</code>)<br>
<code>%#/://</code> removes all <code>:</code>.
(<code>0b:19:35:31:34</code> becomes <code>0b19353134</code>)<br>
<code>%#/([^+-])*([+-])/\2\1/</code> moves a postfix sign to the front.
(<code>1.23-</code> becomes <code>-1.23</code>)<br>
</p>
<a name="mantexp"></a>
<h2>13. MantissaExponent DOUBLE converter (<code>%m</code>)</h2>
<h2>15. MantissaExponent DOUBLE converter (<code>%m</code>)</h2>
<p>
This exotic and experimental format matches numbers in the format
<i>[sign] mantissa sign exponent</i>, e.g <code>+123-4</code> meaning
@ -591,7 +642,7 @@ the usual way (always sign, left justified, space instead of + sign).
Flags <code>#</code> and <code>0</code> are unsupported.
</p>
<a name="timestamp"></a>
<h2>14. Timestamp DOUBLE converter (<code>%T(<em>timeformat</em>)</code>)</h2>
<h2>16. Timestamp DOUBLE converter (<code>%T(<em>timeformat</em>)</code>)</h2>
<p>
This format reads or writes timestamps and converts them to a double number.
The value represents the number of seconds since 1970 (the UNIX epoch).

1
doc/nav.html
View File

@ -132,6 +132,7 @@ div div div a {list-style-type:circle;}
<a target="_parent" href="formats.html#bcd" title="Binary coded decimal LONG converter">%D</a>
<a target="_parent" href="formats.html#chksum" title="Checksum pseudo converter">%&lt;<em>checksum</em>&gt;</a>
<a target="_parent" href="formats.html#regex" title="Perl regular expression STRING converter">%/<em>regex</em>/</a>
<a target="_parent" href="formats.html#regsub" title="Perl regular expression substitution pseudo converter">%#/<em>regex</em>/<em>subst</em>/</a>
<a target="_parent" href="formats.html#mantexp" title="MantissaExponent DOUBLE converter">%m</a>
<a target="_parent" href="formats.html#timestamp" title="Timestamp DOUBLE converter">%T</a>
</div>