whitespace, line breaks etc.

[librarian.git] / librarian / parser.py

diff --git a/librarian/parser.py b/librarian/parser.py
index 595dd97..4cdaa79 100644 (file)
--- a/librarian/parser.py
+++ b/librarian/parser.py
@@ -1,8 +1,15 @@
 # -*- coding: utf-8 -*-
 # -*- coding: utf-8 -*-

-from librarian import ValidationError, NoDublinCore, dcparser, ParseError
+#
+# This file is part of Librarian, licensed under GNU Affero GPLv3 or later.
+# Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
+#
+from librarian import ValidationError, NoDublinCore,  ParseError
+from librarian import RDFNS
+from librarian import dcparser
+

 from xml.parsers.expat import ExpatError
 from lxml import etree
 from xml.parsers.expat import ExpatError
 from lxml import etree

-from lxml.etree import XMLSyntaxError
+from lxml.etree import XMLSyntaxError, XSLTApplyError

 
 import re
 from StringIO import StringIO
 
 import re
 from StringIO import StringIO


@@ -10,29 +17,32 @@ from StringIO import StringIO
 class WLDocument(object):
     LINE_SWAP_EXPR = re.compile(r'/\s', re.MULTILINE | re.UNICODE);
 
 class WLDocument(object):
     LINE_SWAP_EXPR = re.compile(r'/\s', re.MULTILINE | re.UNICODE);
 

-    def __init__(self, edoc):
+    def __init__(self, edoc, parse_dublincore=True):

         self.edoc = edoc
 
         root_elem = edoc.getroot()
         self.edoc = edoc
 
         root_elem = edoc.getroot()

-        rdf_ns = dcparser.BookInfo.RDF
-        dc_path = './/' + rdf_ns('RDF')
-        
+
+        dc_path = './/' + RDFNS('RDF')
+

         if root_elem.tag != 'utwor':
             raise ValidationError("Invalid root element. Found '%s', should be 'utwor'" % root_elem.tag)
 
         if root_elem.tag != 'utwor':
             raise ValidationError("Invalid root element. Found '%s', should be 'utwor'" % root_elem.tag)
 

-        self.rdf_elem = root_elem.find(dc_path)
+        if parse_dublincore:
+            self.rdf_elem = root_elem.find(dc_path)

 
 

-        if self.rdf_elem is None:
-            raise NoDublinCore('Document has no DublinCore - which is required.')
+            if self.rdf_elem is None:
+                raise NoDublinCore('Document has no DublinCore - which is required.')

 
 

-        self.book_info = dcparser.BookInfo.from_element(self.rdf_elem)
+            self.book_info = dcparser.BookInfo.from_element(self.rdf_elem)
+        else:
+            self.book_info = None

 
     @classmethod
 
     @classmethod

-    def from_string(cls, xml, swap_endlines=False):
-        return cls.from_file(StringIO(xml), swap_endlines)
+    def from_string(cls, xml, *args, **kwargs):
+        return cls.from_file(StringIO(xml), *args, **kwargs)

 
     @classmethod
 
     @classmethod

-    def from_file(cls, xmlfile, swap_endlines=False):
+    def from_file(cls, xmlfile, swap_endlines=False, parse_dublincore=True):

 
         # first, prepare for parsing
         if isinstance(xmlfile, basestring):
 
         # first, prepare for parsing
         if isinstance(xmlfile, basestring):


@@ -47,24 +57,98 @@ class WLDocument(object):
         if not isinstance(data, unicode):
             data = data.decode('utf-8')
 
         if not isinstance(data, unicode):
             data = data.decode('utf-8')
 

-        if swap_endlines:
-            data = cls.LINE_SWAP_EXPR.sub(u'<br />\n', data)
-    
+        data = data.replace(u'\ufeff', '')
+

         try:
         try:

-            parser = etree.XMLParser(remove_blank_text=True)
-            return cls( etree.parse(StringIO(data), parser) )
-        except XMLSyntaxError, e:
-             raise ParseError(e.message)            
-        except ExpatError, e:
-            raise ParseError(e.message)            
+            parser = etree.XMLParser(remove_blank_text=False)
+            tree = etree.parse(StringIO(data), parser)
+
+            if swap_endlines:
+                cls.swap_endlines(tree)
+
+            return cls(tree, parse_dublincore=parse_dublincore)
+        except (ExpatError, XMLSyntaxError, XSLTApplyError), e:
+            raise ParseError(e)
+
+    @classmethod
+    def swap_endlines(cls, tree):
+        # only swap inside stanzas
+        for elem in tree.iter('strofa'):
+            for child in list(elem):
+                if child.tail:
+                    chunks = cls.LINE_SWAP_EXPR.split(child.tail)
+                    ins_index = elem.index(child) + 1
+                    while len(chunks) > 1:
+                        ins = etree.Element('br')
+                        ins.tail = chunks.pop()
+                        elem.insert(ins_index, ins)
+                    child.tail = chunks.pop(0)
+            if elem.text:
+                chunks = cls.LINE_SWAP_EXPR.split(elem.text)
+                while len(chunks) > 1:
+                    ins = etree.Element('br')
+                    ins.tail = chunks.pop()
+                    elem.insert(0, ins)
+                elem.text = chunks.pop(0)
+
+    def chunk(self, path):
+        # convert the path to XPath
+        expr = self.path_to_xpath(path)
+        elems = self.edoc.xpath(expr)
+
+        if len(elems) == 0:
+            return None
+        else:
+            return elems[0]
+
+    def path_to_xpath(self, path):
+        parts = []
+
+        for part in path.split('/'):
+            match = re.match(r'([^\[]+)\[(\d+)\]', part)
+            if not match:
+                parts.append(part)
+            else:
+                tag, n = match.groups()
+                parts.append("*[%d][name() = '%s']" % (int(n)+1, tag) )
+
+        if parts[0] == '.':
+            parts[0] = ''
+
+        return '/'.join(parts)

 
     def transform(self, stylesheet, **options):
         return self.edoc.xslt(stylesheet, **options)
 
     def update_dc(self):
 
     def transform(self, stylesheet, **options):
         return self.edoc.xslt(stylesheet, **options)
 
     def update_dc(self):

-        parent = self.rdf_elem.getparent()
-        parent.replace( self.rdf_elem, self.book_info.to_etree(parent) )
+        if self.book_info:
+            parent = self.rdf_elem.getparent()
+            parent.replace( self.rdf_elem, self.book_info.to_etree(parent) )

 
     def serialize(self):
         self.update_dc()
         return etree.tostring(self.edoc, encoding=unicode, pretty_print=True)
 
     def serialize(self):
         self.update_dc()
         return etree.tostring(self.edoc, encoding=unicode, pretty_print=True)

+
+    def merge_chunks(self, chunk_dict):
+        unmerged = []
+
+        for key, data in chunk_dict.iteritems():
+            try:
+                xpath = self.path_to_xpath(key)
+                node = self.edoc.xpath(xpath)[0]
+                repl = etree.fromstring(u"<%s>%s</%s>" %(node.tag, data, node.tag) )
+                node.getparent().replace(node, repl);
+            except Exception, e:
+                unmerged.append( repr( (key, xpath, e) ) )
+
+        return unmerged
+
+    def clean_ed_note(self):
+        """ deletes forbidden tags from nota_red """
+
+        for node in self.edoc.xpath('|'.join('//nota_red//%s' % tag for tag in
+                    ('pa', 'pe', 'pr', 'pt', 'begin', 'end', 'motyw'))):
+            tail = node.tail
+            node.clear()
+            node.tag = 'span'
+            node.tail = tail