verbose curriculum levels in model
[librarian.git] / librarian / parser.py
index 55b4e4b..12fffb3 100644 (file)
 # -*- coding: utf-8 -*-
+#
+# 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, DCNS
+from librarian import RDFNS, IOFile
 from librarian import dcparser
 
 from xml.parsers.expat import ExpatError
 from lxml import etree
 from lxml.etree import XMLSyntaxError, XSLTApplyError
 
+import os
 import re
 from StringIO import StringIO
 
-class WLDocument(object):
-    LINE_SWAP_EXPR = re.compile(r'/\s', re.MULTILINE | re.UNICODE);
-
-    def __init__(self, edoc, parse_dublincore=True):
-        self.edoc = edoc
 
-        root_elem = edoc.getroot()
-       
-        dc_path = './/' + RDFNS('RDF')
-        
+class WLDocument(object):
+    LINE_SWAP_EXPR = re.compile(r'/\s', re.MULTILINE | re.UNICODE)
+    provider = None
+
+    _edoc = None
+
+    @property
+    def edoc(self):
+        if self._edoc is None:
+            data = self.source.get_string()
+            if not isinstance(data, unicode):
+                data = data.decode('utf-8')
+            data = data.replace(u'\ufeff', '')
+            try:
+                parser = etree.XMLParser()
+                self._edoc = etree.parse(StringIO(data.encode('utf-8')), parser)
+            except (ExpatError, XMLSyntaxError, XSLTApplyError), e:
+                raise ParseError(e)
+        return self._edoc
+
+    _rdf_elem = None
+
+    @property
+    def rdf_elem(self):
+        if self._rdf_elem is None:
+            dc_path = './/' + RDFNS('RDF')
+            self._rdf_elem = self.edoc.getroot().find(dc_path)
+            if self._rdf_elem is None:
+                raise NoDublinCore('Document has no DublinCore - which is required.')
+        return self._rdf_elem
+
+    _book_info = None
+
+    @property
+    def book_info(self):
+        if not self.parse_dublincore:
+            return None
+        if self._book_info is None:
+            self._book_info = dcparser.BookInfo.from_element(
+                    self.rdf_elem, fallbacks=self.meta_fallbacks, strict=self.strict)
+        return self._book_info
+
+    def __init__(self, iofile, provider=None, parse_dublincore=True,  # shouldn't it be in a subclass?
+                 strict=False,  # ?
+                 meta_fallbacks=None):  # ?
+        self.source = iofile
+        self.provider = provider
+        self.parse_dublincore = parse_dublincore
+        self.strict = strict
+        self.meta_fallbacks = meta_fallbacks
+        root_elem = self.edoc.getroot()
         if root_elem.tag != 'utwor':
             raise ValidationError("Invalid root element. Found '%s', should be 'utwor'" % root_elem.tag)
-
         if parse_dublincore:
-            self.rdf_elem = root_elem.find(dc_path)
+            self.book_info
 
-            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)
-        else:
-            self.book_info = None
-    
     @classmethod
-    def from_string(cls, xml, swap_endlines=False, parse_dublincore=True):
-        return cls.from_file(StringIO(xml), swap_endlines, parse_dublincore=parse_dublincore)
+    def from_string(cls, xml, *args, **kwargs):
+        return cls(IOFile.from_string(xml), *args, **kwargs)
 
     @classmethod
-    def from_file(cls, xmlfile, swap_endlines=False, parse_dublincore=True):
+    def from_file(cls, xmlfile, *args, **kwargs):
+        iofile = IOFile.from_filename(xmlfile)
+        return cls(iofile, *args, **kwargs)
+
+    def swap_endlines(self):
+        """Converts line breaks in stanzas into <br/> tags."""
+        # only swap inside stanzas
+        for elem in self.edoc.iter('strofa'):
+            for child in list(elem):
+                if child.tail:
+                    chunks = self.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 = self.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)
 
-        # first, prepare for parsing
-        if isinstance(xmlfile, basestring):
-            file = open(xmlfile, 'rb')
-            try:
-                data = file.read()
-            finally:
-                file.close()
-        else:
-            data = xmlfile.read()
-
-        if not isinstance(data, unicode):
-            data = data.decode('utf-8')
-
-        if swap_endlines:
-            data = cls.LINE_SWAP_EXPR.sub(u'<br />\n', data)
-    
-        try:
-            parser = etree.XMLParser(remove_blank_text=True)
-            return cls(etree.parse(StringIO(data), parser), parse_dublincore=parse_dublincore)
-        except (ExpatError, XMLSyntaxError, XSLTApplyError), e:
-            raise ParseError(e)                  
-
-    def part_as_text(self, path):
-        # convert the path to XPath        
-        print "[L] Retrieving part:", path
-
-        elems = self.edoc.xpath(self.path_to_xpath(path))
-        print "[L] xpath", elems
-        
         if len(elems) == 0:
-            return None        
-
-        return etree.tostring(elems[0], encoding=unicode, pretty_print=True)
-
+            return None
+        else:
+            return elems[0]
 
     def path_to_xpath(self, path):
         parts = []
@@ -84,7 +121,7 @@ class WLDocument(object):
                 parts.append(part)
             else:
                 tag, n = match.groups()
-                parts.append("node()[position() = %d and name() = '%s']" % (int(n), tag) )
+                parts.append("*[%d][name() = '%s']" % (int(n)+1, tag))
 
         if parts[0] == '.':
             parts[0] = ''
@@ -95,8 +132,9 @@ class WLDocument(object):
         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()
@@ -108,10 +146,66 @@ class WLDocument(object):
         for key, data in chunk_dict.iteritems():
             try:
                 xpath = self.path_to_xpath(key)
-                node = self.edoc.xpath(xpath)[0]                
-                repl = etree.fromstring(data)
-                node.getparent().replace(node, repl);
+                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) ) )
+                # WTF xpath may be unused; also: too broad except
+                unmerged.append(repr((key, xpath, e)))
+
+        return unmerged
+
+    def clean_ed_note(self):
+        """ deletes forbidden tags from nota_red """
+
+        forbidden_tags = ('pa', 'pe', 'pr', 'pt', 'begin', 'end', 'motyw')
+        for node in self.edoc.xpath('|'.join('//nota_red//%s' % tag for tag in forbidden_tags)):
+            tail = node.tail
+            node.clear()
+            node.tag = 'span'
+            node.tail = tail
+
+    # Converters
+
+    def as_html(self, *args, **kwargs):
+        from librarian import pyhtml as html
+        return html.transform(self, *args, **kwargs)
+
+    def as_text(self, *args, **kwargs):
+        from librarian import text
+        return text.transform(self, *args, **kwargs)
+
+    def as_epub(self, *args, **kwargs):
+        from librarian import epub
+        return epub.transform(self, *args, **kwargs)
+
+    def as_pdf(self, *args, **kwargs):
+        from librarian import pypdf
+        return pypdf.EduModulePDFFormat(self).build(*args, **kwargs)
+
+    def as_mobi(self, *args, **kwargs):
+        from librarian import mobi
+        return mobi.transform(self, *args, **kwargs)
+
+    def as_fb2(self, *args, **kwargs):
+        from librarian import fb2
+        return fb2.transform(self, *args, **kwargs)
+
+    def as_cover(self, cover_class=None, *args, **kwargs):
+        if cover_class is None:
+            from librarian.styles.wolnelektury.cover import WLCover
+            cover_class = WLCover
+        return cover_class(self.book_info, *args, **kwargs).output_file()
+
+    def save_output_file(self, output_file, output_path=None, output_dir_path=None, make_author_dir=False, ext=None):
+        if output_dir_path:
+            save_path = output_dir_path
+            if make_author_dir:
+                save_path = os.path.join(save_path, unicode(self.book_info.author).encode('utf-8'))
+            save_path = os.path.join(save_path, self.book_info.uri.slug)
+            if ext:
+                save_path += '.%s' % ext
+        else:
+            save_path = output_path
 
-        return unmerged
\ No newline at end of file
+        output_file.save_as(save_path)