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RtfParser.py
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RtfParser.py
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import sys
class RtfException(Exception):
pass
plaintext = 1
control = 2
argument = 3
backslash = 4
escapedChar = 5
class RtfParser(object):
def __init__(self,unicode=False):
self.state = plaintext
self.arg = ''
self.token = ''
self.unicode = unicode
def getChar(self,code):
""" called when an escaped char is found """
return chr(code)
def getNonBreakingSpace(self):
return " "
def pushState(self):
pass
def popState(self):
pass
def putChar(self):
pass
def doControl(self,token,arg):
pass
def feed(self,txt):
for c in txt:
self.feedChar(c)
def feedChar(self,char):
if self.state == plaintext: #this is just normal user content
if char == '\\':
self.state = backslash
elif char == '{':
self.pushState()
elif char == '}':
self.popState()
else:
self.putChar(char)
elif self.state == backslash: #something special like a command or escape
if char == '\\' or char == '{' or char == '}':
self.putChar(char)
self.state = plaintext
else:
if char.isalpha() or char in ('*','-','|'):
self.state = control
self.token = char
elif char == "'":
self.state = escapedChar
self.escapedChar = ''
elif char in ['\\','{','}']:
self.putChar(char)
self.state = plaintext
elif char == "~": #non breking space
self.putChar(self.getNonBreakingSpace())
self.state = plaintext
else:
raise RtfException,'unexpected %s after \\' % char
elif self.state == escapedChar:
self.escapedChar = self.escapedChar + char
if len(self.escapedChar) == 2:
char = self.getChar(int(self.escapedChar,16))
self.putChar(char)
self.state = plaintext
elif self.state == control: #collecting the command token
if char.isalpha():
self.token = self.token + char
elif char.isdigit() or char== '-':
self.state = argument
self.arg = char
else:
self.doControl(self.token,self.arg)
self.state = plaintext
if char == '\\':
self.state = backslash
elif char == '{':
self.pushState()
elif char == '}':
self.popState()
else:
if not char.isspace():
self.putChar(char)
elif self.state == argument: #collecting the optional command argument
if char.isdigit():
self.arg = self.arg + char
else:
self.state = plaintext
self.doControl(self.token,self.arg)
if char == '\\':
self.state = backslash
elif char == '{':
self.pushState()
elif char == '}':
self.popState()
else:
if not char.isspace():
self.putChar(char)
class RtfTester(RtfParser):
def __init__(self, foutput):
RtfParser.__init__(self)
self.level = 0
self.foutput = foutput
def pushState(self):
self.foutput.write(unicode(self.level) + ' pushState ' + unicode(self.level + 1) + '\n')
self.level = self.level + 1
def popState(self):
self.foutput.write(unicode(self.level) + ' popState ' + unicode(self.level - 1) + '\n')
self.level = self.level - 1
def putChar(self,ch):
self.foutput.write(unicode(self.level) + ' putChar ' + unicode(ch))
def doControl(self,token,arg):
self.foutput.write(unicode(self.level) + ' doControl ' + unicode(token) + ' ' + unicode(arg))
if __name__ == '__main__':
import CmdLine
CmdLine.main(RtfTester)