XML Parsing

[StallSpin]

I'm trying to get a Measure to parse an XML file from a site. Sounds easy enough, but some of the tags are not constant. Sometimes there are multiples of the same tag. For example:

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<sky_condition sky_cover="SCT" cloud_base_ft_agl="3500"/>
<sky_condition sky_cover="OVC" cloud_base_ft_agl="4900"/>

This is showing currently, but there can be up to 4 of the <sky_condition ... /> tags, or there can be zero.

Here's what that section might look like in my ski:

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[Variables]
URL="http://abcd"
SkyCover=sky_cover="(.*)"
CloudBase=cloud_base_ft_agl="(.*)"

[MeasureWebsite]
Measure=Plugin
Plugin=WebParser
UpadateRate=1800
URL=#URL#
RegExp="(?siU)#SkyCover#.*#CloudBase#"

[MeasureSkyCover]
Measure=Plugin
Plugin=WebParser
Url=[MeasureWebsite]
StringIndex=1

[MeasureCloudBase]
Measure=Plugin
Plugin=WebParser
Url=[MeasureWebsite]
StringIndex=2

[MeterSkyCover]
MeasureName=MeasureSkycover1
Meter=STRING
MeterStyle=StyleMetar
Text=Clouds %1

[MeterCloudBase]
MeasureName=MeasureCloudbase
Meter=STRING
MeterStyle=StyleMetar
Text=Base %1

I'm not yet familiar enough with regex to figure out how to return a value multiple times or none. I also need it to return 4 values whether there are 4 XML tags or not, because otherwise the stringIndex values will be off. Unless there is a simpler way to do this. I have tried several different methods (I've been at this for hours...) but I won't clutter the post up trying to explain them and make myself look silly.

Any thoughts? Thanks.

[Kaelri]

This is what lookahead assertions are for. In you case, you would use something like this:

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[Variables]
URL="http://abcd"
SkyCover=sky_cover="(.*)"
CloudBase=cloud_base_ft_agl="(.*)"
SkyCondition=(?(?=.*<sky_condition).*#SkyCover#.*#CloudBase#.*)

[MeasureWebsite]
Measure=Plugin
Plugin=WebParser
UpadateRate=1800
URL=#URL#
RegExp="(?siU)#SkyCondition##SkyCondition##SkyCondition##SkyCondition#"

You'll be glad to know that these are specifically designed to preserve the StringIndex order. :)

[StallSpin]

Thanks a lot for that info, I finally got everything reading correctly.

I went on to spend 30 minutes trying to determine why the skin refused to update from my XML, only to find out that I had entered "UpadateRate"...