X-Git-Url: http://gitweb.michael.orlitzky.com/?a=blobdiff_plain;f=src%2FKML.py;h=9b589ad582c0ac4f11c16a775222716bf7fa1d2f;hb=3a1235a834118bb52c5d92fce9c7182c04a44e0b;hp=890021da4167d13b0e9f7f56ae984a3c76f50f51;hpb=18b00503e26e51db44a6b3d9b279162f8278b868;p=dead%2Fcensus-tools.git

diff --git a/src/KML.py b/src/KML.py
index 890021d..9b589ad 100644
--- a/src/KML.py
+++ b/src/KML.py
@@ -3,6 +3,7 @@ Utility classes for working with the Keyhole Markup Language (KML).
 """
 
 import sys
+from xml.sax.saxutils import escape
 
 
 class KmlObject(object):
@@ -21,6 +22,9 @@ class KmlObject(object):
     generate a closing tag. A call to render() generally returns the
     element's text, and renders its children recursively.
     """
+
+    OPEN_TAG = ''
+    CLOSE_TAG = ''
     
     def __init__(self, initial_text=''):
         self.children = []
@@ -28,49 +32,56 @@ class KmlObject(object):
 
         
     def to_kml(self):
-        return self.render()
+        kml = self.OPEN_TAG
+        kml += self.render()
+        kml += self.CLOSE_TAG + "\n"
+        return kml
 
 
     def render(self):
-        kml = self.text
+        kml = escape(self.text)
 
         for c in self.children:
             kml += c.to_kml()
-
+        
         return kml
 
 
+    def print_kml(self):
+        print self.OPEN_TAG
+        self.render_to_stdout()
+        print self.CLOSE_TAG
+
+        
+    def render_to_stdout(self):
+        if (len(self.text) > 0):
+            print escape(self.text)
+        
+        for c in self.children:
+            c.print_kml()
+
+
 
 class Color(KmlObject):
     
-    def to_kml(self):
-        kml = '<color>'
-        kml += self.render()
-        kml += "</color>\n"
-        return kml
+    OPEN_TAG = '<color>'
+    CLOSE_TAG = '</color>'
 
-    
         
 class Document(KmlObject):
+
+    OPEN_TAG = """<?xml version=\"1.0\" encoding=\"UTF-8\"?>
+<kml xmlns=\"http://www.opengis.net/kml/2.2\">
+<Document>"""
+
+    CLOSE_TAG = """</Document>
+</kml>"""
     
     def __init__(self, initial_text=''):
         super(Document, self).__init__(initial_text)
         self.styles = []
 
         
-    def to_kml(self):
-        kml =  "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
-        kml += "<kml xmlns=\"http://www.opengis.net/kml/2.2\">\n"
-        kml += "<Document>\n"
-
-        kml += self.render()
-
-        kml += "</Document>\n"
-        kml += "</kml>\n"
-
-        return kml
-
-
     def render(self):
         kml = ''
         
@@ -83,78 +94,150 @@ class Document(KmlObject):
         return kml
 
 
+    def render_to_stdout(self):
+        for s in self.styles:
+            s.print_kml()
+            
+        for c in self.children:
+            c.print_kml()
+
+
 
 class Description(KmlObject):
     
-    def to_kml(self):
-        kml = '<description>'
-        kml += self.render()
-        kml += "</description>\n"
-        return kml
-    
+    OPEN_TAG = '<description>'
+    CLOSE_TAG = '</description>'
 
 
-class Name(KmlObject):
-    
-    def to_kml(self):
-        kml = '<name>'
-        kml += self.render()
-        kml += "</name>\n"
-        return kml
 
+class Coordinates(KmlObject):
 
+    OPEN_TAG = '<coordinates>'
+    CLOSE_TAG = '</coordinates>'
 
-class Placemark(KmlObject):
 
-    def to_kml(self):
-        kml = "<Placemark>\n"
-        kml += self.render()
-        kml += "</Placemark>\n"
-        return kml
+class LineString(KmlObject):
 
+    OPEN_TAG = '<LineString>'
+    CLOSE_TAG = '</LineString>'
 
+    @classmethod
+    def parse_linestrings(self, kml):
+        """
+        Parse each <LineString>...</LineString> block from the KML.
+        """
+        linestrings = []
 
-class PolyStyle(KmlObject):
+        search_idx = kml.find(self.OPEN_TAG, 0)
 
-    def to_kml(self):
-        kml = "<PolyStyle>\n"
-        kml += self.render()
-        kml += "</PolyStyle>\n"
-        return kml
+        while (search_idx != -1):
+            # No reason to keep the tag around.
+            ls_start = search_idx + len(self.OPEN_TAG)
+            ls_tag_end = kml.find(self.CLOSE_TAG, ls_start)
+            ls = kml[ ls_start : ls_tag_end ]
+            linestrings.append(ls)
+            search_idx = kml.find(self.OPEN_TAG, (ls_tag_end + len(self.CLOSE_TAG)))
+
+        return linestrings
+
+
+    @classmethod
+    def parse_coordinates_from_linestrings(self, linestrings):
+        coords = []
+
+        for ls in linestrings:
+            c_tag_start = ls.find(Coordinates.OPEN_TAG)
+            c_start = c_tag_start + len(Coordinates.OPEN_TAG)
+            c_end = ls.find(Coordinates.CLOSE_TAG)
+            c = ls[ c_start : c_end ]
+            coords.append(c)
+
+        return coords
+
+
+    @classmethod
+    def tuples_from_kml(self, kml):
+        """
+        Parse one or more linestrings from a KML document.
+        Return a list of tuples.
+        """
+        ls = self.parse_linestrings(kml)
+        cs = self.parse_coordinates_from_linestrings(ls)
+
+        tuples = []
+
+        for c in cs:
+            pointstrings = c.strip().split()
+            for point in pointstrings:
+                components = point.strip().split(',')
+                if (len(components) >= 2):
+                    # Project the three-dimensional vector onto the
+                    # x-y plane. I don't think we're going to run
+                    # in to any linestrings in 3d.
+                    tuples.append( (float(components[0]), float(components[1])) )
+
+        return tuples
+
+
+class Name(KmlObject):
+    
+    OPEN_TAG = '<name>'
+    CLOSE_TAG = '</name>'
+    
+
+
+class Placemark(KmlObject):
+    
+    OPEN_TAG = '<Placemark>'
+    CLOSE_TAG = '</Placemark>'
+    
+    
 
+class PolyStyle(KmlObject):
+    
+    OPEN_TAG = '<PolyStyle>'
+    CLOSE_TAG = '</PolyStyle>'
+    
 
         
 class Style(KmlObject):
-
-    def __init__(self, initial_text='', initial_id=None):
+    
+    OPEN_TAG = "<Style id=\"%s\">"
+    CLOSE_TAG = '</Style>'
+    
+    def __init__(self, initial_text='', initial_id=''):
         super(Style, self).__init__(initial_text)
         self.id = initial_id
 
         
     def to_kml(self):
         kml = ''
-        
-        if (self.id == None):
-            kml += "<Style>\n"
-        else:
-            kml += ("<Style id=\"%s\">\n" % self.id)
-
+        kml += (self.OPEN_TAG % self.id + "\n")
         kml += self.render()
-        kml += "</Style>\n"
+        kml += self.CLOSE_TAG + "\n"
         
         return kml
 
 
+    def print_kml(self):
+        print (self.OPEN_TAG % self.id)
+        self.render_to_stdout()
+        print self.CLOSE_TAG
 
-class StyleUrl(KmlObject):
-
-    def to_kml(self):
-        kml = '<styleUrl>'
-        kml += self.render()
-        kml += "</styleUrl>\n"
-        return kml
+    
 
+class StyleUrl(KmlObject):
+    
+    OPEN_TAG = '<styleUrl>'
+    CLOSE_TAG = '</styleUrl>'
 
+    
         
 class RawText(KmlObject):
-    pass
+
+    def to_kml(self):
+        return self.text
+
+    def print_kml(self):
+        if (len(self.text) > 0):
+            print self.text