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Add swappable CSS for HTML previews.
[librarian.git] / librarian / parser.py
diff --git a/librarian/parser.py b/librarian/parser.py
index 595dd97..efe6e95 100644 (file)
--- a/librarian/parser.py
+++ b/librarian/parser.py
@@ -1,41 +1,60 @@
 # -*- 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 __future__ import unicode_literals
+
+from librarian import ValidationError, NoDublinCore,  ParseError, NoProvider
+from librarian import RDFNS
+from librarian.cover import make_cover
+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 os
 import re
 import re
-from StringIO import StringIO
+import six
+
 
 class WLDocument(object):
 
 class WLDocument(object):
-    LINE_SWAP_EXPR = re.compile(r'/\s', re.MULTILINE | re.UNICODE);
+    LINE_SWAP_EXPR = re.compile(r'/\s', re.MULTILINE | re.UNICODE)
+    provider = None
 
 
-    def __init__(self, edoc):
+    def __init__(self, edoc, parse_dublincore=True, provider=None, 
+                 strict=False, meta_fallbacks=None):
         self.edoc = edoc
         self.edoc = edoc
+        self.provider = provider
 
         root_elem = edoc.getroot()
 
         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 must have a '%s' element." % RDFNS('RDF'))
 
 
-        self.book_info = dcparser.BookInfo.from_element(self.rdf_elem)
+            self.book_info = dcparser.BookInfo.from_element(
+                    self.rdf_elem, fallbacks=meta_fallbacks, strict=strict)
+        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_bytes(cls, xml, *args, **kwargs):
+        return cls.from_file(six.BytesIO(xml), *args, **kwargs)
 
     @classmethod
 
     @classmethod
-    def from_file(cls, xmlfile, swap_endlines=False):
+    def from_file(cls, xmlfile, *args, **kwargs):
 
         # first, prepare for parsing
 
         # first, prepare for parsing
-        if isinstance(xmlfile, basestring):
+        if isinstance(xmlfile, six.text_type):
             file = open(xmlfile, 'rb')
             try:
                 data = file.read()
             file = open(xmlfile, 'rb')
             try:
                 data = file.read()
@@ -44,27 +63,170 @@ class WLDocument(object):
         else:
             data = xmlfile.read()
 
         else:
             data = xmlfile.read()
 
-        if not isinstance(data, unicode):
+        if not isinstance(data, six.text_type):
             data = data.decode('utf-8')
 
             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(six.BytesIO(data.encode('utf-8')), parser)
+
+            return cls(tree, *args, **kwargs)
+        except (ExpatError, XMLSyntaxError, XSLTApplyError) as e:
+            raise ParseError(e)
+
+    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 parts(self):
+        if self.provider is None:
+            raise NoProvider('No document provider supplied.')
+        if self.book_info is None:
+            raise NoDublinCore('No Dublin Core in document.')
+        for part_uri in self.book_info.parts:
+            yield self.from_file(self.provider.by_uri(part_uri), provider=self.provider)
+
+    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()
 
     def serialize(self):
         self.update_dc()
-        return etree.tostring(self.edoc, encoding=unicode, pretty_print=True)
+        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 as e:
+                unmerged.append(repr((key, xpath, e)))
+
+        return unmerged
+
+    def clean_ed_note(self, note_tag='nota_red'):
+        """ deletes forbidden tags from nota_red """
+
+        for node in self.edoc.xpath('|'.join('//%s//%s' % (note_tag, tag) for tag in
+                                    ('pa', 'pe', 'pr', 'pt', 'begin', 'end', 'motyw'))):
+            tail = node.tail
+            node.clear()
+            node.tag = 'span'
+            node.tail = tail
+
+    def editors(self):
+        """Returns a set of all editors for book and its children.
+
+        :returns: set of dcparser.Person objects
+        """
+        if self.book_info is None:
+            raise NoDublinCore('No Dublin Core in document.')
+        persons = set(self.book_info.editors + self.book_info.technical_editors)
+        for child in self.parts():
+            persons.update(child.editors())
+        if None in persons:
+            persons.remove(None)
+        return persons
+
+    # Converters
+
+    def as_html(self, *args, **kwargs):
+        from librarian import 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 pdf
+        return pdf.transform(self, *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:
+            cover_class = make_cover
+        return cover_class(self.book_info, *args, **kwargs).output_file()
+
+    # for debugging only
+    def latex_dir(self, *args, **kwargs):
+        kwargs['latex_dir'] = True
+        from librarian import pdf
+        return pdf.transform(self, *args, **kwargs)
+
+    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, six.text_type(self.book_info.author).encode('utf-8'))
+            save_path = os.path.join(save_path, self.book_info.url.slug)
+            if ext:
+                save_path += '.%s' % ext
+        else:
+            save_path = output_path
+
+        output_file.save_as(save_path)