Re: [Pyparsing] Dealing with blocks in different order
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Re: [Pyparsing] Dealing with blocks in different order
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From: john g. <joh...@ya...> - 2015-04-21 05:41:22
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I've been stuck on the same thing. I think I know the answer, but I have not had time to verify it. If you find one of the examples for parsing a C structure, I think it must contain the secret because the parser works no matter the order of the structure members. If my memory is correct, that example has parsers defined for each type of member (e.g. single variable, array, pointer, etc), and then there is a single parser that ORs each of the other parsers together, and the matches get inserted into a container (i.e. OneOrMore).
Let me know if you find a fix!
FYI: I've had great support on the wikispaces site. Paul has answered many of my questions. However, finding that support channel was insanely difficult. You have to go to the home page, then click Getting Help in the left side menu, then in the body of the page that appears, click the text that is underlined/hyperlinked saying "pyparsing home page" (which is poorly named).
-John
On Monday, April 20, 2015 12:37 PM, "mlist @dslextreme.com" <ml...@ds...> wrote:
I have everything I need to parse a file defined, but I am running in to a
problem. The main part of the file consists of different blocks (see
below) and the blocks can be in different order or not even there. I am not
sure how to deal with this. For example, it could be
[video block]
[audio block]
or
[audio block]
[video block]
or
[video block]
[audio block]
[audio block]
or any permutation of the above.
Here is the sample text
Track ID 1 soun (Audio) Enabled Not self-contained
Format soun/aac 48000 Hz aac FormatFlags: 0x00000000 Bytes/Pkt: 0
Frames/Pkt: 1024 Bytes/Frame: 0 Chan/Frame: 2 Bits/Chan: 0 Reserved:
0x00000000
ChannelLayout: Stereo (L R)
Media Timescale: 48000 Duration: 240640/48000 00:00:05.013
MinSampleDuration: 1024/48000 AdvanceDecodeDelta: 0/48000
00:00:00.000
Num data bytes: 80213 Est. data rate: 127.999 kbps Nominal
framerate: 46.875 fps 235 samples
Track volume: 1
Included in auto selection. Language code <und>
Dimensions: 0 x 0 Track Matrix: 1.0 0.0 0.0 / 0.0 1.0 0.0 / 0.0 0.0 1.0
1 edit: Media start 0/48000 00:00:00.000 dur 3000/600
00:00:05.000 Track start 0/600 00:00:00.000 dur 3000/600
00:00:05.000
Track ID 2 vide (Video) Enabled Not self-contained
Format vide/avc1 dimensions: video 1920 x 1080, presentation: 1920
x 1080 (pixelAspect+clean), cleanAperture: 1920 x 1080 @ 0,0
(originTopLeft)
Media Timescale: 600 Duration: 3003/600 00:00:05.005
MinSampleDuration: 20/600 AdvanceDecodeDelta: 21/600 00:00:00.035
Num data bytes: 6555892 Est. data rate: 10.479 Mbps Nominal
framerate: 29.970 fps 150 samples
Frame Reordering Required
Included in auto selection. Language code <und>
Dimensions: 1920 x 1080 CleanAperture: 1920 x 1080
ProductionAperture: 1920 x 1080 EncodedPixels: 1920 x 1080 Track
Matrix: 1.0 0.0 0.0 / 0.0 1.0 0.0 / 0.0 0.0 1.0
1 edit: Media start 0/600 00:00:00.000 dur 3000/600
00:00:05.000 Track start 0/600 00:00:00.000 dur 3000/600
00:00:05.000
And here is what my code looks like:
# Audio Block
self.audio_track_info = Group(
self.track_id + self.audio_track_format + self.channel_layout +
self.media_timescale +
self.track_data + self.audio_track_volume + self.included +
self.audio_track_dimensions +
OneOrMore(self.edits).setResultsName('edits')).setResultsName('audio_track')
# Video Block
self.video_track_info = Group(self.track_id + self.video_track_format
+ self.media_timescale + self.track_data +
self.included + self.video_track_dimensions +
OneOrMore(self.edits).setResultsName('edits')).setResultsName('video_track')
self.tracks = Group(ZeroOrMore(self.video_track_info)) +
Group(ZeroOrMore(self.audio_track_info)).setResultsName('tracks')
I am using parseString on the text and this only returns the audio block
and not the video block.
How do I fix this?
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