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[redakcja.git] / apps / wiki / xml_tools.py

diff --git a/apps/wiki/xml_tools.py b/apps/wiki/xml_tools.py
index a4de433..6dc5089 100755 (executable)
--- a/apps/wiki/xml_tools.py
+++ b/apps/wiki/xml_tools.py
@@ -1,59 +1,120 @@
+from functools import wraps

 import re
 
 from lxml import etree
 import re
 
 from lxml import etree

+from wiki.constants import TRIM_BEGIN, TRIM_END, MASTERS
+
+RE_TRIM_BEGIN = re.compile("^<!--%s-->$" % TRIM_BEGIN, re.M)
+RE_TRIM_END = re.compile("^<!--%s-->$" % TRIM_END, re.M)
+
+
+class ParseError(BaseException):
+    pass
+
+
+def obj_memoized(f):
+    """
+        A decorator that caches return value of object methods.
+        The cache is kept with the object, in a _obj_memoized property.
+    """
+    @wraps(f)
+    def wrapper(self, *args, **kwargs):
+        if not hasattr(self, '_obj_memoized'):
+            self._obj_memoized = {}
+        key = (f.__name__,) + args + tuple(sorted(kwargs.iteritems()))
+        try:
+            return self._obj_memoized[key]
+        except TypeError:
+            return f(self, *args, **kwargs)
+        except KeyError:
+            self._obj_memoized[key] = f(self, *args, **kwargs)
+            return self._obj_memoized[key]
+    return wrapper

 
 

-from wiki.constants import RE_TRIM_BEGIN, RE_TRIM_END

 
 class GradedText(object):
 
 class GradedText(object):

-    _is_xml = None

     _edoc = None
     _edoc = None

-    _is_wl = None
-    _master = None

 
     ROOT = 'utwor'
 
     ROOT = 'utwor'

-    MASTERS = ['powiesc',
-               'opowiadanie',
-               'liryka_l',
-               'liryka_lp',
-               'dramat_wierszowany_l',
-               'dramat_wierszowany_lp',
-               'dramat_wspolczesny',
-               ]

     RDF = '{http://www.w3.org/1999/02/22-rdf-syntax-ns#}RDF'
 
     def __init__(self, text):
         self._text = text
 
     RDF = '{http://www.w3.org/1999/02/22-rdf-syntax-ns#}RDF'
 
     def __init__(self, text):
         self._text = text
 

+    @obj_memoized

     def is_xml(self):
     def is_xml(self):

-        if self._is_xml is None:
-            try:
-                self._edoc = etree.fromstring(self._text)
-            except etree.XMLSyntaxError:
-                self._is_xml = False
-            else:
-                self._is_xml = True
-            del self._text
-        return self._is_xml
+        """
+            Determines if it's a well-formed XML.

 
 

+            >>> GradedText("<a/>").is_xml()
+            True
+            >>> GradedText("<a>").is_xml()
+            False
+        """
+        try:
+            self._edoc = etree.fromstring(self._text)
+        except etree.XMLSyntaxError:
+            return False
+        return True
+
+    @obj_memoized

     def is_wl(self):
     def is_wl(self):

-        if self._is_wl is None:
-            if self.is_xml():
-                e = self._edoc
-                self._is_wl = e.tag == self.ROOT and (
-                    len(e) == 1 and e[0].tag in self.MASTERS or
-                    len(e) == 2 and e[0].tag == self.RDF 
-                        and e[1].tag in self.MASTERS)
-                if self._is_wl:
-                    self._master = e[-1].tag
-                del self._edoc
-            else:
-                self._is_wl = False
-        return self._is_wl
+        """
+            Determines if it's an XML with a <utwor> and a master tag.
+
+            >>> GradedText("<utwor><powiesc></powiesc></utwor>").is_wl()
+            True
+            >>> GradedText("<a></a>").is_wl()
+            False
+        """
+        if self.is_xml():
+            e = self._edoc
+            # FIXME: there could be comments
+            ret = e.tag == self.ROOT and (
+                len(e) == 1 and e[0].tag in MASTERS or
+                len(e) == 2 and e[0].tag == self.RDF 
+                    and e[1].tag in MASTERS)
+            if ret:
+                self._master = e[-1].tag
+            del self._edoc
+            return ret
+        else:
+            return False
+
+    @obj_memoized
+    def is_broken_wl(self):
+        """
+            Determines if it at least looks like broken WL file
+            and not just some untagged text.
+
+            >>> GradedText("<utwor><</utwor>").is_broken_wl()
+            True
+            >>> GradedText("some text").is_broken_wl()
+            False
+        """
+        if self.is_wl():
+            return True
+        text = self._text.strip()
+        return text.startswith('<utwor>') and text.endswith('</utwor>')

 
     def master(self):
 
     def master(self):

+        """
+            Gets the master tag.
+
+            >>> GradedText("<utwor><powiesc></powiesc></utwor>").master()
+            'powiesc'
+        """

         assert self.is_wl()
         return self._master
 
         assert self.is_wl()
         return self._master
 

+    @obj_memoized
+    def has_trim_begin(self):
+        return RE_TRIM_BEGIN.search(self._text)
+
+    @obj_memoized
+    def has_trim_end(self):
+        return RE_TRIM_END.search(self._text)
+

 
 def _trim(text, trim_begin=True, trim_end=True):
     """ 
 
 def _trim(text, trim_begin=True, trim_end=True):
     """ 


@@ -87,3 +148,57 @@ def compile_text(parts):
     # only trim beginning if it's not still the first non-empty
     texts.append(_trim(text, trim_begin=trim_begin, trim_end=False))
     return "".join(texts)
     # only trim beginning if it's not still the first non-empty
     texts.append(_trim(text, trim_begin=trim_begin, trim_end=False))
     return "".join(texts)

+
+
+def change_master(text, master):
+    """
+        Changes the master tag in a WL document.
+    """
+    e = etree.fromstring(text)
+    e[-1].tag = master
+    return etree.tostring(e, encoding="utf-8")
+
+
+def basic_structure(text, master):
+    e = etree.fromstring('''<utwor>
+<master>
+<!--%s--><!--%s-->
+</master>
+</utwor>''' % (TRIM_BEGIN, TRIM_END))
+    e[0].tag = master
+    e[0][0].tail = "\n"*3 + text + "\n"*3
+    return etree.tostring(e, encoding="utf-8")
+
+
+def add_trim_begin(text):
+    trim_tag = etree.Comment(TRIM_BEGIN)
+    e = etree.fromstring(text)
+    for master in e[::-1]:
+        if master.tag in MASTERS:
+            break
+    if master.tag not in MASTERS:
+        raise ParseError('No master tag found!')
+
+    master.insert(0, trim_tag)
+    trim_tag.tail = '\n\n\n' + (master.text or '')
+    master.text = '\n'
+    return etree.tostring(e, encoding="utf-8")
+
+
+def add_trim_end(text):
+    trim_tag = etree.Comment(TRIM_END)
+    e = etree.fromstring(text)
+    for master in e[::-1]:
+        if master.tag in MASTERS:
+            break
+    if master.tag not in MASTERS:
+        raise ParseError('No master tag found!')
+
+    master.append(trim_tag)
+    trim_tag.tail = '\n'
+    prev = trim_tag.getprevious()
+    if prev is not None:
+        prev.tail = (prev.tail or '') + '\n\n\n'
+    else:
+        master.text = (master.text or '') + '\n\n\n'
+    return etree.tostring(e, encoding="utf-8")