Parse pdf reference manual for 1.4 to extract dictionary definition, initial code. Use spec2def.py …

experimental/PdfViewer/spec2def.py

Index: experimental/PdfViewer/spec2def.py
===================================================================
--- experimental/PdfViewer/spec2def.py	(revision 0)
+++ experimental/PdfViewer/spec2def.py	(revision 0)
@@ -0,0 +1,271 @@
+#!/usr/local/bin/python
+# coding: utf-8
+
+import sys
+import re
+
+# TODO(edisonn): put processed part of file in a new file
+# put unprocessed part, in a new file, so we see what we miss
+# keep blank lines, and generate a version without the blank lines
+
+#TODO (edisonn): deal manually with
+#         TABLE 7.11 Restrictions on the entries in a soft-mask image dictionary
+#KEY                       RESTRICTION
+
+
+ 
+lines = 0
+table = ''
+tableHeaderFound = False
+tableLine = 0
+tableRow = 0
+columnWidth = []
+columnValues = ['', '', '']
+mustFollowTableHeader = False
+
+knownTypes = {
+'(any)',
+unicode('undefined', 'utf8'),
+'(undefined)',
+'(various)',
+'array',
+'or',
+'boolean',
+'date',
+'dictionary',
+'function',
+'integer',
+unicode('file', 'utf8'),
+'file',
+unicode('specification', 'utf8'),
+'specification',
+'name',
+'tree',
+'number',
+'rectangle',
+'stream',
+'string',
+'text',
+',',
+' '
+}
+
+def acceptType(val):
+  global knownTypes
+  
+  ret = val
+  
+  for item in knownTypes:
+    ret = ret.replace(item, '')
+    
+  return ret == ''
+
+
+def inTable():
+  global tableHeaderFound
+  return tableHeaderFound    
+
+def tableDescriptionFound(desc): 
+  global table
+  table = desc.strip()    
+
+def tableHasHeader(): 
+  global table
+  global tableHeaderFound
+
+  tableHeaderFound = True
+  #print table    
+
+  
+def commitRow():
+  global columnValues
+  #print columnValues
+  
+  lastClosed = columnValues[2].find(')')
+  if lastClosed < 0:
+    print 'ERRRRRRRRRRRRRRROR'
+    print columnValues
+    return
+    
+  spec = columnValues[2][:lastClosed + 1]
+  spec = spec.replace('(', ';')
+  spec = spec.replace(')', ';')
+  spec = spec.strip(';')
+  
+  specs = spec.split(';')
+
+  # clearly required, but it can be required with conditions. don't handle this ones here, but manually  
+  required = specs[0] == 'Required' 
+  
+  inheritable = False
+  version = ''
+  for s in specs:
+    if s.strip() == 'inheritable' or s.strip() == 'Inheritable':
+      inheritable = True
+    elif re.match('^PDF [0-9]*[\.[0-9]*]*', s.strip()):
+      version = s.strip()
+    elif s != 'Required':
+      required = False
+      
+  print spec
+  print specs
+  print required
+  print inheritable
+  print version
+  print columnValues
+  
+def newRow(first, second, third):
+  global columnValues
+  columnValues = [first.rstrip(), second.rstrip(), third.rstrip()]
+
+def appendRow(second, third):
+  global columnValues
+  if second.rstrip() != '':
+    columnValues[1] = columnValues[1] + ' ' + second.rstrip()
+  if third.rstrip() != '':
+    columnValues[2] = columnValues[2] + ' ' + third.rstrip()
+
+def rebaseTable(line):
+  global knownTypes
+  global columnWidth
+  
+  words = line.split()
+  
+  if len(words) < 3:
+    return False
+
+  i = 1
+  while i < len(words) - 1 and words[i] in knownTypes:
+    i = i + 1
+    
+  if words[i].startswith('(Optional') or words[i].startswith('(Required'):
+    commitRow()
+    
+    columnWidth[0] = line.find(words[1])
+    
+    if words[i].startswith('(Optional'):
+      columnWidth[1] = line.find('(Optional') - columnWidth[0] 
+    if words[i].startswith('(Required'):
+      columnWidth[1] = line.find('(Required') - columnWidth[0] 
+    return True
+    
+  return False
+    
+    
+def stopTable():
+  global tableHeaderFound
+  commitRow()
+  tableHeaderFound = False
+    
+
+def killTable():
+  return
+
+def processLine(line):
+  global lines
+  global tableLine
+  global tableRow
+  global columnWidth
+  global columnValues
+  global mustFollowTableHeader
+  
+  lines = lines + 1
+  
+  line = unicode(line, 'utf8')
+  
+  striped = line.rstrip()
+  
+  words = line.split()
+  if len(words) == 0:
+    return
+    
+  if words[0] == 'TABLE':
+    tableDescriptionFound(striped)
+    mustFollowTableHeader = True
+    return
+  
+  if mustFollowTableHeader:
+    mustFollowTableHeader = False
+    if len(words) != 3:
+      killTable()
+ 
+    # TODO(edisonn): support for generic table!
+    if words[0] != 'KEY' or words[1] != 'TYPE' or words[2] != 'VALUE':
+      killTable()
+      return
+
+    tableHasHeader()
+    columnWidth = [0, 0, 0]
+    columnWidth[0] = striped.index('TYPE')
+    columnWidth[1] = striped.index('VALUE') - striped.index('TYPE')
+    columnWidth[2] = 0
+    return
+      
+  if inTable():
+    tableLine = tableLine + 1
+    first = striped[0 : columnWidth[0]]
+    second = striped[columnWidth[0] : columnWidth[0] + columnWidth[1]]
+    third = striped[columnWidth[0] + columnWidth[1] :]
+    
+    if tableLine == 1:
+      if third[0] != '(':
+        killTable()
+        return
+
+      newRow(first, second, third)
+      return
+    
+    if rebaseTable(striped):
+      first = striped[0 : columnWidth[0]]
+      second = striped[columnWidth[0] : columnWidth[0] + columnWidth[1]]
+      third = striped[columnWidth[0] + columnWidth[1] :]
+    
+    first = first.rstrip()
+    second = second.rstrip()
+    third = third.rstrip()
+        
+    if first == '' and second == '' and third != '':
+      appendRow(second, third)
+      return
+      
+    if len(first.split()) > 1:
+      stopTable()
+      return
+
+    if first != '' and first[0] == ' ':
+      stopTable()
+      return
+
+    if first != '' and second != '' and third == '':
+      stopTable()
+      return
+
+    if first == '' and second != '' and second[0] != ' ':
+      if acceptType(second):
+        appendRow(second, third)
+      else:
+        stopTable()
+      return
+
+    if first != '' and second != '' and third[0] != '(':
+      stopTable()
+      return
+      
+    if first == '' and second != '' and second[0] == ' ':
+      stopTable()
+      return
+
+    if first != '' and second != '' and third[0] == '(':
+      commitRow()
+      newRow(first, second, third)
+      return
+  
+
+def generateDef():
+  global lines
+  for line in sys.stdin:
+    processLine(line)
+  print lines
+
+if '__main__' == __name__:
+  sys.exit(generateDef())