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"""This parses the tcl script and calls virtual methods to translate the code
to target language."""
import re
# Some module variables used internally.
token = "[+\-]?[\$0-9A-Za-z_\.{}]+"
hexnumber = "0x[0-9abcdefABCDEF]+"
number = "[+-]?[0-9]+(?:(?:\.[0-9]+)?(?:e[+-][0-9]+)?)?"
number2 = "[+-]?\.[0-9]+(?:e[+-][0-9]+)?"
word_separator = "[ \t]"
command_separator = "[\n;]"
word = "%s*(%s|%s|%s|%s)"% (word_separator, hexnumber, number2, number, token)
reWord = re.compile("^%s" % word )
reNewWord = re.compile("^(?:%s|%s)*%s" % (command_separator, word_separator,
word))
reCondition = re.compile("%s*([!<>=]+)" % word_separator)
reOperation = re.compile("%s*([|&<>=!+\-/%%*()]+)" % word_separator)
reStackBegin = re.compile("%s*(?<!\\\)\[" % word_separator)
reStackEnd = re.compile("%s*(?<!\\\)\]" % word_separator)
reNewStackBegin = re.compile("^(?:%s|%s)*(?<!\\\)\[" % (word_separator,
command_separator))
reNewStackEnd = re.compile("^(?:%s|%s)*(?<!\\\)\]" % (word_separator,
command_separator))
reString = re.compile("%s*(?<!\\\)\"" % word_separator)
reComment = re.compile("%s*(#[^\n]*)" % word_separator)
reNewComment = re.compile("(?:%s|%s)*(#[^\n]*)" % (word_separator,
command_separator))
reVariable = re.compile("\$[0-9A-Za-z_]+")
reFormattingNewLine = re.compile("[\\\][\n]")
reIgnore1 = re.compile("%s*package%s[^\n]*" % (command_separator,
word_separator))
reIgnore2 = re.compile(\
"(%s|%s)*iren AddObserver UserEvent {wm deiconify .vtkInteract}" \
% (command_separator, word_separator))
reIgnore3 = re.compile("(%s|%s)*wm%s[^\n]*" % (command_separator,
word_separator, word_separator))
reIgnore4 = re.compile("(%s|%s)*update" % (command_separator,word_separator))
reBlockBegin = re.compile("(?:%s|%s)*\{" % (word_separator, command_separator))
reBlockEnd = re.compile("(?:%s|%s)*\}" % (word_separator, command_separator))
reStringText = re.compile("(?<!\\\)[^\"\]\[\$]+")
class vtkTclParser:
def __init__(self):
self._instring = ""
self._command_stack = []
self._in_process_string = False
pass
def success(self):
"""Indicates if the most recent feed was translated in its entirity"""
if len(self._instring.strip()) == 0:
return True
return False
def reset(self):
"""resets internal state. All translated text gets discarded"""
self._in_process_string = False
self._instring = ""
self._command_stack = []
pass
def _error(self, str):
"""prints error"""
print str
def feed(self, str):
"""translates the argument"""
str = re.sub(reFormattingNewLine," ",str)
self._instring += str
cmd = self._process_command()
while cmd:
self.handle_command(cmd)
cmd = self._process_command()
return
def _process_command(self):
""""Internal method: Processes a single line in tcl script"""
cmd = self._get_first_word_in_new_command()
if not cmd:
return None
arguments = []
arg = self._get_next_word_in_command()
while arg != None:
arguments.append(arg)
arg = self._get_next_word_in_command()
translated = self.translate_command(cmd, arguments)
return translated
def _process_string(self):
"""Internal method: process an string enclosed in quotes"""
if self._in_process_string:
return None
self._in_process_string = True
result = "\""
arg = self._get_next_word_in_command(True)
while arg:
if (arg[0] == "["):
arg = arg[1:len(arg)-1]
result += "\" + str(" + arg + ") + \""
else:
m = reVariable.search(arg)
while m:
result += arg[:m.start(0)] + "\" + "
result += arg[m.start(0)+1:m.end(0)] + " + \""
arg = arg[m.end():]
m = reVariable.search(arg)
result += arg
arg = self._get_next_word_in_command(True)
result += "\""
self._in_process_string = False
return result
def translate_command(self, command, arguments):
"""called to translate a command"""
pass
def translate_operator(self, op):
"""called to translate an operator"""
pass
def handle_command(self, translated_cmd):
"""called to handle a translated command"""
pass
def translate_token(self, token):
"""called to translate a token"""
pass
def _ignore(self):
"""Internal method: checks for ignored command"""
match = reIgnore1.match(self._instring)
if not match:
match = reIgnore2.match(self._instring)
if not match:
match = reIgnore3.match(self._instring)
if not match:
match = reIgnore4.match(self._instring)
if match:
self._instring = self._instring[match.end(0):]
return True
return False
def _get_next_word_in_command(self, processing_string= False):
"""Internal method: returns next token in current command, if any"""
if processing_string:
match = reStringText.match(self._instring)
if match:
self._instring = self._instring[match.end(0):]
return match.group(0)
match = reBlockBegin.match(self._instring)
if match:
#return "{" + self._get_block() + "}"
return self._get_block()
match = reWord.match(self._instring)
if match:
word = match.group(1)
self._instring = self._instring[match.end(0):]
word = self.translate_token(word)
if processing_string:
word = "[" + word + "]"
return word
match = reStackBegin.match(self._instring)
if match:
self._instring = self._instring[match.end(0):]
if not processing_string:
return self._process_command()
if processing_string:
return "[" + self._process_command() + "]"
match = reStackEnd.match(self._instring)
if match:
self._instring = self._instring[match.end(0):]
return None
match = reString.match(self._instring)
if match:
self._instring = self._instring[match.end(0):]
if not self._in_process_string:
return self._process_string()
else:
return None
match = reOperation.match(self._instring)
if match:
self._instring = self._instring[match.end(0):]
return self.translate_operator(match.group(1))
return None
def _get_first_word_in_new_command(self):
"""Internal method: returns start token in a command, if any"""
while self._ignore():
pass
match = reNewWord.match(self._instring)
if match:
word = match.group(1)
self._instring = self._instring[match.end(0):]
word = self.translate_token(word)
return word
match = reNewStackBegin.match(self._instring)
if match:
self._instring = self._instring[match.end(0):]
return self._process_command()
match = reNewStackEnd.match(self._instring)
if match:
self._instring = self._instring[match.end(0):]
return None
match = reNewComment.match(self._instring)
if match:
self._instring = self._instring[match.end(0):]
return match.group(1)
match = reString.match(self._instring)
if match:
self._instring = self._instring[match.end(0):]
if not self._in_process_string:
return self._process_string()
else:
return None
return None
def _get_block(self):
"""Internal method: returns everything between { and }"""
brace_count = 0
start_index = 0
end_index = len(self._instring)
for i in range(0, len(self._instring)):
if not self._instring[i] in ["{","}"]:
continue
if self._instring[i] == "}":
brace_count -= 1
if brace_count == 0:
block = self._instring[start_index:i]
self._instring = self._instring[i+1:]
return block
continue
if self._instring[i] == "{":
brace_count += 1
if brace_count== 1:
start_index = i+1
continue
self._error("Unterminated block!")
return None
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