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import os |
import os |
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import string |
import string |
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|
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from Thuban.Lib.fileutil import relative_filename |
import Thuban.Lib.fileutil |
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def relative_filename(dir, filename): |
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"""Return a filename relative to dir for the absolute file name absname. |
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This is almost the same as the function in fileutil, except that dir |
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can be an empty string in which case filename will be returned |
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unchanged. |
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""" |
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if dir: |
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return Thuban.Lib.fileutil.relative_filename(dir, filename) |
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else: |
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return filename |
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|
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def escape(data): |
def escape(data): |
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"""Escape &, \", ', <, and > in a string of data. |
"""Escape &, \", ', <, and > in a string of data. |
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data = string.replace(data, "'", "'") |
data = string.replace(data, "'", "'") |
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return data |
return data |
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|
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def save_session(session, filename): |
class Saver: |
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"""Save the session session to the file given by filename""" |
|
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dir = os.path.dirname(filename) |
"""Class to serialize a session into an XML file. |
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file = open(filename, 'w') |
|
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write = file.write |
Applications built on top of Thuban may derive from this class and |
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write('<?xml version="1.0" encoding="UTF-8"?>\n') |
override or extend the methods to save additinal information. This |
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write('<!DOCTYPE session SYSTEM "thuban.dtd">\n') |
additional information should take the form of additional attributes |
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write('<session title="%s">\n' % escape(session.title)) |
or elements whose names are prefixed with a namespace. To define a |
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for map in session.Maps(): |
namespace derived classes should extend the write_session method to |
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write('\t<map title="%s">\n' % escape(map.title)) |
pass the namespaces to the default implementation. |
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if map.projection and len(map.projection.params) > 0: |
""" |
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write('\t\t<projection>\n') |
|
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for param in map.projection.params: |
def __init__(self, session): |
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write('\t\t\t<parameter value="%s"/>\n' % escape(param)) |
self.session = session |
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write('\t\t</projection>\n') |
|
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def write(self, file_or_filename): |
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"""Write the session to a file. |
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The argument may be either a file object or a filename. If it's |
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a filename, the file will be opened for writing. Files of |
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shapefiles will be stored as filenames relative to the directory |
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the file is stored in (as given by os.path.dirname(filename)) if |
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they have a common parent directory other than the root |
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directory. |
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If the argument is a file object (which is determined by the |
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presence of a write method) all filenames will be absolut |
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filenames. |
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""" |
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if hasattr(file_or_filename, "write"): |
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# it's a file object |
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self.file = file_or_filename |
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self.dir = "" |
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else: |
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filename = file_or_filename |
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self.dir = os.path.dirname(filename) |
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self.file = open(filename, 'w') |
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self.write_header() |
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self.write_session(self.session) |
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def write_element(self, element, attrs, empty = 0, indentation = ""): |
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# Helper function to write an element open tag with attributes |
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self.file.write("%s<%s" % (indentation, element)) |
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for name, value in attrs.items(): |
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self.file.write(' %s="%s"' % (escape(name), escape(value))) |
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if empty: |
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self.file.write("/>\n") |
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else: |
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self.file.write(">\n") |
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|
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def write_header(self): |
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"""Write the XML header""" |
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write = self.file.write |
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write('<?xml version="1.0" encoding="UTF-8"?>\n') |
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write('<!DOCTYPE session SYSTEM "thuban.dtd">\n') |
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|
| 98 |
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def write_session(self, session, attrs = None, namespaces = ()): |
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"""Write the session and its contents |
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By default, write a session element with the title attribute and |
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call write_map for each map contained in the session. |
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|
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The optional argument attrs is for additional attributes and, if |
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given, should be a mapping from attribute names to attribute |
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values. The values should not be XML-escaped yet. |
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|
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The optional argument namespaces, if given, should be a sequence |
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of (name, URI) pairs. The namespaces are written as namespace |
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attributes into the session element. This is mainly useful for |
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derived classes that need to store additional information in a |
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thuban session file. |
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""" |
| 114 |
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if attrs is None: |
| 115 |
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attrs = {} |
| 116 |
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attrs["title"] = session.title |
| 117 |
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for name, uri in namespaces: |
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attrs["xmlns:" + name] = uri |
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self.write_element("session", attrs) |
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for map in session.Maps(): |
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self.write_map(map) |
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self.file.write('</session>\n') |
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|
| 124 |
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def write_map(self, map): |
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"""Write the map and its contents. |
| 126 |
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|
| 127 |
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By default, write a map element element with the title |
| 128 |
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attribute, call write_projection to write the projection |
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element, call write_layer for each layer contained in the map |
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and finally call write_label_layer to write the label layer. |
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""" |
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write = self.file.write |
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write('\t<map title="%s">\n' % escape(map.title)) |
| 134 |
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self.write_projection(map.projection) |
| 135 |
for layer in map.Layers(): |
for layer in map.Layers(): |
| 136 |
fill = layer.fill |
self.write_layer(layer) |
| 137 |
if fill is None: |
self.write_label_layer(map.LabelLayer()) |
| 138 |
fill = "None" |
write('\t</map>\n') |
| 139 |
else: |
|
| 140 |
fill = fill.hex() |
def write_projection(self, projection): |
| 141 |
stroke = layer.stroke |
"""Write the projection. |
| 142 |
if stroke is None: |
""" |
| 143 |
stroke = "None" |
if projection and len(projection.params) > 0: |
| 144 |
else: |
self.file.write('\t\t<projection>\n') |
| 145 |
stroke = stroke.hex() |
for param in projection.params: |
| 146 |
write(('\t\t<layer title="%s" filename="%s"' |
self.file.write('\t\t\t<parameter value="%s"/>\n' |
| 147 |
' fill="%s" stroke="%s" stroke_width="%d"/>\n') % |
% escape(param)) |
| 148 |
(escape(layer.title), |
self.file.write('\t\t</projection>\n') |
| 149 |
escape(relative_filename(dir, layer.filename)), |
|
| 150 |
fill, stroke, layer.stroke_width)) |
def write_layer(self, layer, attrs = None): |
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labels = map.LabelLayer().Labels() |
"""Write the layer. |
| 152 |
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|
| 153 |
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The optional argument attrs is for additional attributes and, if |
| 154 |
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given, should be a mapping from attribute names to attribute |
| 155 |
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values. The values should not be XML-escaped yet. |
| 156 |
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""" |
| 157 |
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if attrs is None: |
| 158 |
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attrs = {} |
| 159 |
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attrs["title"] = layer.title |
| 160 |
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attrs["filename"] = relative_filename(self.dir, layer.filename) |
| 161 |
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attrs["stroke_width"] = str(layer.stroke_width) |
| 162 |
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fill = layer.fill |
| 163 |
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if fill is None: |
| 164 |
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attrs["fill"] = "None" |
| 165 |
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else: |
| 166 |
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attrs["fill"] = fill.hex() |
| 167 |
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stroke = layer.stroke |
| 168 |
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if stroke is None: |
| 169 |
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attrs["stroke"] = "None" |
| 170 |
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else: |
| 171 |
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attrs["stroke"] = stroke.hex() |
| 172 |
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self.write_element("layer", attrs, empty = 1, indentation = "\t\t") |
| 173 |
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|
| 174 |
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def write_label_layer(self, layer): |
| 175 |
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"""Write the label layer. |
| 176 |
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""" |
| 177 |
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labels = layer.Labels() |
| 178 |
if labels: |
if labels: |
| 179 |
write('\t\t<labellayer>\n') |
self.file.write('\t\t<labellayer>\n') |
| 180 |
for label in labels: |
for label in labels: |
| 181 |
write(('\t\t\t<label x="%g" y="%g" text="%s"' |
self.file.write(('\t\t\t<label x="%g" y="%g" text="%s"' |
| 182 |
' halign="%s" valign="%s"/>\n') |
' halign="%s" valign="%s"/>\n') |
| 183 |
% (label.x, label.y, label.text, label.halign, |
% (label.x, label.y, label.text, label.halign, |
| 184 |
label.valign)) |
label.valign)) |
| 185 |
write('\t\t</labellayer>\n') |
self.file.write('\t\t</labellayer>\n') |
| 186 |
write('\t</map>\n') |
|
| 187 |
write('</session>\n') |
|
| 188 |
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|
| 189 |
|
def save_session(session, file, saver_class = None): |
| 190 |
|
"""Save the session session to a file. |
| 191 |
|
|
| 192 |
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The file argument may either be a filename or an open file object. |
| 193 |
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|
| 194 |
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The optional argument saver_class is the class to use to serialize |
| 195 |
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the session. By default or if it's None, the saver class will be |
| 196 |
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Saver. |
| 197 |
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|
| 198 |
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If writing the session is successful call the session's |
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UnsetModified method |
| 200 |
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""" |
| 201 |
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if saver_class is None: |
| 202 |
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saver_class = Saver |
| 203 |
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saver = saver_class(session) |
| 204 |
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saver.write(file) |
| 205 |
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|
| 206 |
# after a successful save consider the session unmodified. |
# after a successful save consider the session unmodified. |
| 207 |
session.UnsetModified() |
session.UnsetModified() |
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