source: subversion/applications/rendering/mapnik/generate_xml.py @ 20253

Last change on this file since 20253 was 19709, checked in by ldp, 10 years ago

Fix previous commit

File size: 6.7 KB
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1#!/usr/bin/env python
2
3import os
4import re
5import sys
6import glob
7import optparse
8import platform
9import tempfile
10
11__version__ = '0.1.0'
12
13REASONABLE_DEFAULTS = {
14        'epsg':'900913', # default osm2pgsql import srid
15        'world_boundaries':'world_boundaries', # relative path
16        'symbols':'symbols', # relative path
17        'prefix':'planet_osm', # default osm2pgsql table prefix
18        'extent':'-20037508,-19929239,20037508,19929239', # world in merc
19        'inc':'inc/*.template', # search path for inc templates to parse
20        'estimate_extent':'false',   
21        'extent':'-20037508,-19929239,20037508,19929239',   
22        }
23
24def color_text(color, text):
25    if os.name == 'nt':
26        return text
27    return "\033[9%sm%s\033[0m" % (color,text)
28
29class Params:
30    def __init__(self,params,accept_none):
31        self.params = params
32        self.accept_none = accept_none
33        self.missing = []
34   
35    def blend_with_env(self,opts):
36        d = {}
37       
38        for p in self.params:
39            env_var_name = 'MAPNIK_%s' % p.upper()
40
41            # first pull from passed options...
42            if not opts.get(p) is None:
43                d[p] = opts[p]
44
45            # then try to pull from environment settings
46            elif not os.environ.get(env_var_name) is None:
47                d[p] = os.environ[env_var_name]
48
49            # then assign any reasonable default values...
50            elif p in REASONABLE_DEFAULTS.keys():
51                d[p] = REASONABLE_DEFAULTS[p]
52            # if --accept-none is passed then we assume
53            # its a paramater that mapnik likely does not need
54            # and will ignore if it is an empty string (e.g. db values)
55            elif self.accept_none:
56                d[p] = ''
57            else:
58                self.missing.append(p)
59        return d
60
61def serialize(xml,options):
62    try:
63        import mapnik
64    except:
65        sys.exit(color_text(1,'Error: saving xml requires Mapnik python bindings to be installed'))
66    m = mapnik.Map(1,1)
67    if options.from_string:
68        mapnik.load_map_from_string(m,xml,True)
69    else:
70        mapnik.load_map(m,xml,True)
71    if options.output:
72        mapnik.save_map(m,options.output)
73    else:
74        if hasattr(mapnik,'mapnik_version') and mapnik.mapnik_version() >= 700:
75            print mapnik.save_map_to_string(m)
76        else:
77            sys.exit(color_text(1,'Minor error: printing XML to stdout requires Mapnik >=0.7.0, please provide a second argument to save the output to a file'))
78
79def validate(params,parser):
80    if not os.path.exists(params['world_boundaries']):
81        parser.error("Directory '%s' used for param '%s' not found" % (params['world_boundaries'],'world_boundaries'))
82    supported_srs = [900913,4326]
83    if not int(params['epsg']) in supported_srs:
84        parser.error('Sorry only supported projections are: %s' % supported_srs)
85    if not params['estimate_extent'] == 'false':
86        params['extent'] = ''
87
88# set up parser...
89parser = optparse.OptionParser(usage="""%prog [template xml] [output xml] <parameters>
90
91Full help:
92 $ %prog -h (or --help for possible options)
93
94Read 'osm.xml' and print resulting xml to stdout:
95 $ %prog osm.xml
96
97Read template, save output xml, and pass variables as options
98 $ %prog osm.xml my_osm.xml --dbname spain --user postgres --host ''""", version='%prog ' + __version__)
99
100
101if __name__ == '__main__':
102
103    # custom parse of includes directory if supplied...
104    if '--inc' in sys.argv:
105        idx = sys.argv.index('--inc')
106        if not len(sys.argv) > (idx+1) or '--' in sys.argv[idx+1]:
107            parser.error("--inc argument requires a path to a directory as an argument")
108        else:
109            search_path = os.path.join(sys.argv[idx+1],'*.template')
110    else:
111        search_path = REASONABLE_DEFAULTS['inc']
112   
113    inc_dir = os.path.dirname(search_path)
114    parser.add_option('--inc', dest='inc', help="Includes dir (default: '%s')" % inc_dir )
115   
116    parser.add_option('--accept-none', dest='accept_none', action='store_true', help="Interpret lacking value as unneeded")
117   
118    if not os.path.exists(inc_dir):
119        parser.error("The 'inc' path you gave is bogus!")
120       
121    # get all the includes
122    includes = glob.glob(search_path)
123   
124    if not includes:
125        parser.error("Can't find include templates, please provide search path using '--inc' , currently using '%s'" % search_path)
126
127    p = re.compile('.*%\((\w+)\)s.*')
128   
129    text = ''
130    for xml in includes:
131        text += file(xml,'rb').read()
132   
133    # find all variables in template includes
134    matches = p.findall(text)
135   
136    if not matches:
137        parser.error(color_text(1,"Can't properly parse out variables in include templates.\nMake sure they are all wrapped like '%(variable)s'"))
138   
139    # look ahead and build up --help text...
140    #import pdb;pdb.set_trace()
141    p = Params(matches,accept_none=False)
142    blended = p.blend_with_env({})
143    for var in matches:
144        msg = "(default: '%(" + var + ")s')"
145        if var in blended:
146            default = msg % blended
147        else:
148            default = ''#msg % {var:'None'}
149        parser.add_option('--%s' % var, dest=var,
150            help="Set value of '%s' %s" % (var,default))
151
152    # now, actually run the tool...
153    (options, args) = parser.parse_args()
154    p = Params(matches,options.accept_none)
155    blended = p.blend_with_env(options.__dict__)
156   
157    help_text = "\n\nNote: use --accept-none to pass blank values for other parameters "
158    if p.missing:
159        parser.error(color_text(1,"\nPlease provide the following parameters values (or set as env variables):\n%s" % ''.join([" --%s 'value' " % v for v in p.missing]) + help_text))
160   
161    validate(blended,parser)
162   
163    for xml in includes:
164        template = file(xml,'rb')
165        new_name = xml.replace('.template','')
166        new_file = file(new_name,'wb')
167        try:
168            new_file.write(template.read() % blended)
169        except ValueError, e:
170            parser.error(color_text(1,"\n%s (found in %s)" % (e,xml)))
171        template.close()
172        new_file.close()
173       
174    options.output = None
175    options.from_string = False
176    template_xml = None
177    # accepting XML as stream...
178    if not sys.stdin.isatty():
179        template_xml = sys.stdin.read()
180        options.from_string = True
181        if len(args) > 0:
182            options.output = args[0]
183    elif len(args) == 0:
184        template_xml = None
185        options.output = None
186    else:
187        template_xml = args[0]
188        if len(args) > 1:
189            options.output = args[1]
190
191    if template_xml:
192        serialize(template_xml,options)
193    else:
194        print 'Include files written successfully! Pass the osm.xml file as an argument if you want to serialize a new version or test reading the XML'
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