Difference between revisions of "User:Dylan Potter"

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(→‎Bold-ified preferred name, to highlight that it is preferred)
 
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* [https://github.com/caitp github]
 
* [https://github.com/caitp github]
 
* [http://www.facebook.com/cait.potter facebook]
 
* [http://www.facebook.com/cait.potter facebook]
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== OSD600 ==
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<u>09/25/2012:</u>
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Over the weekend, I wrote a set of about 31 conformance tests for a webvtt parser ([https://github.com/downloads/caitp/webvtt/caitp-cue_settings_tests-09232012.tgz here], more recent ones should be posted [[OSD600/webvtt/cue_settings|here]]).
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This is a relatively simple section of the draft, as far as I can tell. It can be illustrated essentially like this (BNF, no state machine diagram here) -- regular expressions have been included in some areas, eg /[0-9]+/. I'm not including the BNF for the other cue-settings here, this is just a start. The main point is that BNF will be helpful for writing scanners and parsers.
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<pre>
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<webvtt-delimiter> ::= U+0020
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                    | U+0009
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<webvtt-delimiters> ::= <webvtt-delimiter>
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                      | <webvtt-delimiters> <webvtt-delimiter>
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<vertical-value> ::= "rl"
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                  | "lr"
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<vertical-setting> ::= "vertical" ":" <vertical-value>
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<line-value-pct> ::= /[0-9]+/ "%"
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<line-value-num> ::= /[0-9]+/
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                  | "-" /[0-9]+/
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<line-value> ::= <line-value-pct>
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              | <line-value-num>
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<line-setting> ::= "line" ":" <line-value>
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<cue-setting> ::= <vertical-setting>
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                | <line-setting>
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                | <position-setting>
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                | <size-setting>
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                | <align-setting>
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<cue-settings> ::= <cue-setting>
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                | <cue-settings> <webvtt-delimiters> <cue-setting>
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</pre>
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Some implementation details for the parser:
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The spec allows for multiple cue-settings per line (as shown in the BNF), however, the same line setting may not be repeated twice, which would not be caught by a parser generator based on the BNF alone, and would have to be checked for in code.
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<u>09/10/2012:</u>
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After a few nights of headaches trying to build mozilla-central on windows 7 with Visual Studio 2010, and not getting much in the way of help from IRC, I have finally got a preliminary build together, and am able to attach the VS debugger, which is nice.
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Minoo Ziaei blogged a mozconfig which gave me some insight into the build system and helped me to get things working correctly.
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I've blogged about it [http://caitpotter.blogspot.ca/2012/09/mozilla-central-built-windows-7-visual.html here]
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While I am still investigating exactly how the changes I made to my configuration allowed me to compile without -WX being passed to cl.exe, and will certainly explain this (because it is not obvious at all from the readme or documentation provided by mozilla), I will post about it again when I figure that out completely, for the benefit of other people who are new to the mozilla source.
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== Bob ==
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[[File:Bob-ross.png|Bob-ross.png|300px]]

Latest revision as of 15:12, 25 September 2012

Me

My (preferred) name is Caitlin Potter, but for the time being my legal given name is Dylan.

I've been a software developer since about 2005, primarily working with C, C++ and Perl (however, I do very much enjoy Ruby, and Java is nice too). I've written numerous programs and scripts for Synrevoice Technologies, and have contributed to some small independent projects here and there.


Interests

  • audio signal processing
  • 3D visualization
  • artificial intelligence
  • electronic music


Links


OSD600

09/25/2012:


Over the weekend, I wrote a set of about 31 conformance tests for a webvtt parser (here, more recent ones should be posted here).


This is a relatively simple section of the draft, as far as I can tell. It can be illustrated essentially like this (BNF, no state machine diagram here) -- regular expressions have been included in some areas, eg /[0-9]+/. I'm not including the BNF for the other cue-settings here, this is just a start. The main point is that BNF will be helpful for writing scanners and parsers. 


<webvtt-delimiter> ::= U+0020

                     | U+0009

<webvtt-delimiters> ::= <webvtt-delimiter>

                      | <webvtt-delimiters> <webvtt-delimiter>



<vertical-value> ::= "rl"

                   | "lr"



<vertical-setting> ::= "vertical" ":" <vertical-value>



<line-value-pct> ::= /[0-9]+/ "%"


<line-value-num> ::= /[0-9]+/

                   | "-" /[0-9]+/



<line-value> ::= <line-value-pct>

               | <line-value-num>



<line-setting> ::= "line" ":" <line-value>


<cue-setting> ::= <vertical-setting>

                | <line-setting>

                | <position-setting>

                | <size-setting>

                | <align-setting>

<cue-settings> ::= <cue-setting>

                 | <cue-settings> <webvtt-delimiters> <cue-setting>



Some implementation details for the parser:

The spec allows for multiple cue-settings per line (as shown in the BNF), however, the same line setting may not be repeated twice, which would not be caught by a parser generator based on the BNF alone, and would have to be checked for in code.



09/10/2012:

After a few nights of headaches trying to build mozilla-central on windows 7 with Visual Studio 2010, and not getting much in the way of help from IRC, I have finally got a preliminary build together, and am able to attach the VS debugger, which is nice.

Minoo Ziaei blogged a mozconfig which gave me some insight into the build system and helped me to get things working correctly.

I've blogged about it here

While I am still investigating exactly how the changes I made to my configuration allowed me to compile without -WX being passed to cl.exe, and will certainly explain this (because it is not obvious at all from the readme or documentation provided by mozilla), I will post about it again when I figure that out completely, for the benefit of other people who are new to the mozilla source.

Bob

Bob-ross.png

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