What is the best/cleaner way to parse this text in python?

Question

I need to parse the following text from an SVG.prop file:

parameters.styleList.0.fill=rgb (255, 0, 0)

parameters.styleList.0.key=-2.74, -2.391666666666667

parameters.styleList.0.markerSize=10,10

parameters.styleList.0.stroke=rgb (255, 0, 0)

parameters.styleList.0.strokeCapType=

parameters.styleList.0.strokeDashArray=

parameters.styleList.0.strokeJoinType=

parameters.styleList.0.strokeWidth=0.5px

parameters.styleList.0.symbol=

parameters.styleList.0.title=-2.740 - -2.392

parameters.styleList.1.fill=rgb (255, 85, 0)

parameters.styleList.1.key=-2.391666666666667, -2.0433333333333334

parameters.styleList.1.markerSize=10,10

parameters.styleList.1.stroke=rgb (255, 85, 0)

parameters.styleList.1.strokeCapType=

parameters.styleList.1.strokeDashArray=

parameters.styleList.1.strokeJoinType=

parameters.styleList.1.strokeWidth=0.5px

parameters.styleList.1.symbol=

parameters.styleList.1.title=-2.392 - -2.043

I need to get, for each class (3rd value in lines "parameters.styleList.0.key") the "fill", "key" and "title" values. What is the best way of doing this in Python3? Thanks

What is your current approach? Did you try anything so far? Do you have had a look at other questions such as https://stackoverflow.com/questions/15857818/python-svg-parser ? — dorvak, Jul 09 '18 at 09:47
@dorvak That question is not relevant, as this is not an SVG file, but apparently a properties file describing an SVG somehow. — AKX, Jul 09 '18 at 09:55

score 1 · Accepted Answer · answered Jul 09 '18 at 09:46

It's straightforward to parse with regexps, using the re module.

import re
from collections import defaultdict
from pprint import pprint

data = """
parameters.styleList.0.fill=rgb (255, 0, 0)
parameters.styleList.0.key=-2.74, -2.391666666666667
parameters.styleList.0.markerSize=10,10
parameters.styleList.0.stroke=rgb (255, 0, 0)
parameters.styleList.0.strokeCapType=
parameters.styleList.0.strokeDashArray=
parameters.styleList.0.strokeJoinType=
parameters.styleList.0.strokeWidth=0.5px
parameters.styleList.0.symbol=
parameters.styleList.0.title=-2.740 - -2.392
parameters.styleList.1.fill=rgb (255, 85, 0)
parameters.styleList.1.key=-2.391666666666667, -2.0433333333333334
parameters.styleList.1.markerSize=10,10
parameters.styleList.1.stroke=rgb (255, 85, 0)
parameters.styleList.1.strokeCapType=
parameters.styleList.1.strokeDashArray=
parameters.styleList.1.strokeJoinType=
parameters.styleList.1.strokeWidth=0.5px
parameters.styleList.1.symbol=
parameters.styleList.1.title=-2.392 - -2.043
"""


style_re = re.compile('^parameters\.styleList\.(?P<id>.+?)\.(?P<property>.+?)=(?P<value>.*)$', re.MULTILINE)

styles = defaultdict(dict)

for match in style_re.finditer(data):
    id, property, value = match.groups()
    styles[id][property] = value

pprint(dict(styles))

outputs

{'0': {'fill': 'rgb (255, 0, 0)',
       'key': '-2.74, -2.391666666666667',
       'markerSize': '10,10',
       'stroke': 'rgb (255, 0, 0)',
       'strokeCapType': '',
       'strokeDashArray': '',
       'strokeJoinType': '',
       'strokeWidth': '0.5px',
       'symbol': '',
       'title': '-2.740 - -2.392'},
 '1': {'fill': 'rgb (255, 85, 0)',
       'key': '-2.391666666666667, -2.0433333333333334',
       'markerSize': '10,10',
       'stroke': 'rgb (255, 85, 0)',
       'strokeCapType': '',
       'strokeDashArray': '',
       'strokeJoinType': '',
       'strokeWidth': '0.5px',
       'symbol': '',
       'title': '-2.392 - -2.043'}}

What is the best/cleaner way to parse this text in python?

1 Answers1