<html><head></head><body><div dir="auto" style="direction: ltr; margin: 0; padding: 0; font-family: sans-serif; font-size: 11pt; color: black; ">That's what the pre exec and post exec functions are for. Call them on either side of the write-exec of your ragel program. <br>
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<div class="gmail_quote">On Thu, Nov 1, 2018 at 10:27 AM -0300, "Ming Fu" <span dir="ltr"><<a href="mailto:Ming.Fu@esentire.com" target="_blank">Ming.Fu@esentire.com</a>></span> wrote:<br>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Hi Adrian,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">I was worried about the case when the input is not in contiguous memory. I will need to call the finish when the input is at the end
of a block and restart class at the beginning of next block. Is there a way to know the current *p is the last byte of a block?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Thanks<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Ming<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Adrian Thurston <thurston@colm.net>
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<b>Sent:</b> November 1, 2018 7:53 AM<br>
<b>To:</b> ragel-users@colm.net<br>
<b>Cc:</b> Ming Fu <Ming.Fu@esentire.com><br>
<b>Subject:</b> Re: [ragel-users] How to process a block of random sized data<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p><span style="font-size:14.0pt;font-family:"Verdana",sans-serif">Hi Ming,<o:p></o:p></span></p>
<p><span style="font-size:14.0pt;font-family:"Verdana",sans-serif">Ragel has no support for this built in. I use a class for this that tracks the start of the interesting input and flushes it out when necessary. The start and finish functions are called from
ragel actions. The preExec and postExec functions are called before and after the ragel write exec. See attached example.<o:p></o:p></span></p>
<p><span style="font-size:14.0pt;font-family:"Verdana",sans-serif">In my uses I expand it to include start and finish functions on the expensive thing (also a stream processor), and I can also pause it to skip over some data that shouldn't go to expensive thing.<o:p></o:p></span></p>
<p><span style="font-size:14.0pt;font-family:"Verdana",sans-serif">I've often thought about building this support into ragel, but once you've got the class made it's super easy to reuse it in many different cases.<o:p></o:p></span></p>
<p><span style="font-size:14.0pt;font-family:"Verdana",sans-serif">Regards,<o:p></o:p></span></p>
<p><span style="font-size:14.0pt;font-family:"Verdana",sans-serif"> Adrian<o:p></o:p></span></p>
<p><span style="font-size:14.0pt;font-family:"Verdana",sans-serif">On 2018-10-31 16:48, Ming Fu wrote:<o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:14.0pt;font-family:"Verdana",sans-serif">Hi,<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:14.0pt;font-family:"Verdana",sans-serif"> <o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:14.0pt;font-family:"Verdana",sans-serif">I have the following ragel rule:<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:14.0pt;font-family:"Verdana",sans-serif"> <o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:14.0pt;font-family:"Verdana",sans-serif">any* $(<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:14.0pt;font-family:"Verdana",sans-serif"> Some_expensive_call(*p)<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:14.0pt;font-family:"Verdana",sans-serif">}<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:14.0pt;font-family:"Verdana",sans-serif"> <o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:14.0pt;font-family:"Verdana",sans-serif">However, I do not necessary have to make the some_expensive_call per input char, I can call some_less_expensive_call(*p,
len) to be more efficient.<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:14.0pt;font-family:"Verdana",sans-serif">How do I figure out the len and adjust pe. Consider the input may not be in contiguous memory block.<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:14.0pt;font-family:"Verdana",sans-serif"> <o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:14.0pt;font-family:"Verdana",sans-serif">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:14.0pt;font-family:"Verdana",sans-serif">Ming<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>ragel-users mailing list<o:p></o:p></pre>
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