look for omissions or inconsistencies in mapnik's python bindings using mapnik-reference

mapnik-reference-validate.py

import mapnik
import json

reference = json.load(open('../mapnik-reference/2.1.0/reference.json', 'r'))

style = mapnik.Style()
for prop in reference['style'].items():
    key = prop[0].replace('-','_')
    assert hasattr(style,key), "'%s' not a valid property of Style" % key

layer = mapnik.Layer('foo')
for prop in reference['layer'].items():
    key = prop[0].replace('-','_')
    assert hasattr(layer,key), "'%s' not a valid property of Layer" % key


map_instance = mapnik.Map(256,256)
for prop in reference['symbolizers']['map'].items():
    key = prop[0].replace('-','_')
    # https://github.com/mapnik/mapnik/issues/1419
    if not key in ['minimum_version','paths_from_xml','font_directory']:
        assert hasattr(map_instance,key), "'%s' not a valid property of Map" % key

total_fails = 0
before = 0
for sym in reference['symbolizers'].items():
    if sym[0] not in ['map','*']:
        sym_name = ''.join([s.title() for s in sym[0].split('-')])
        sym_object = getattr(mapnik,sym_name+'Symbolizer')
        instance_var = None
        if sym_name in ['PolygonPattern','LinePattern']:
            instance_var = sym_object(mapnik.PathExpression(''))
        elif sym_name == 'Shield':
            instance_var = sym_object(mapnik.Expression('True'),'DejaVu Sans Book', 10, mapnik.Color('black'), mapnik.PathExpression(''))
        else:
            instance_var = sym_object()
        fails = []
        for prop in sym[1]:
            key = prop.replace('-','_')
            if key == 'file':
                key = 'filename'
            if sym_name == 'Line' and 'stroke' in key:
                stroke_instance = instance_var.stroke
                if key == 'stroke':
                    key = 'color'
                else:
                   key = key.replace('stroke_','')
                if not hasattr(stroke_instance,key):
                    fails.append("'%s' not a valid property of %s" % (key,'Stroke'))
            elif sym_name == 'Markers' and 'stroke' in key:
                stroke_instance = instance_var.stroke
                if not stroke_instance: # marker.stroke is boost::optional
                    stroke_instance = mapnik.Stroke()
                if key == 'stroke':
                    key = 'color'
                else:
                   key = key.replace('stroke_','')
                if not hasattr(stroke_instance,key):
                    fails.append("'%s' not a valid property of %s" % (key,'Stroke'))
            else:
                if not hasattr(instance_var,key):
                    fails.append("'%s' not a valid property of %s" % (key,sym_name))
        if len(fails):
            print '\n\n%s -->\n' % (sym_name)
            for f in fails:
                print f
            print '(' + '|'.join([i for i in dir(instance_var) if not '__' in i]) + ')'
        total_fails += len(fails);

print '\n\nTOTAL FAILS: %s' % total_fails