99 lines
3.6 KiB
Python
99 lines
3.6 KiB
Python
# vim:ts=4:et
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# ##### BEGIN GPL LICENSE BLOCK #####
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; either version 2
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# of the License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software Foundation,
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# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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#
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# ##### END GPL LICENSE BLOCK #####
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# <pep8 compliant>
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class ScriptError(Exception):
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def __init__(self, fname, line, message):
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Exception.__init__(self, "%s:%d: %s" % (fname, line, message))
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self.line = line
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class Script:
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def __init__(self, filename, text, single="{}()':"):
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self.filename = filename
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self.text = text
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self.single = single
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self.pos = 0
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self.line = 1
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self.unget = False
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def error(self, msg):
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raise ScriptError(self.filename, self.line, msg)
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def tokenAvailable(self, crossline=False):
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if self.unget:
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return True
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while self.pos < len(self.text):
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while self.pos < len(self.text) and self.text[self.pos].isspace():
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if self.text[self.pos] == "\n":
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if not crossline:
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return False
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self.line += 1
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self.pos += 1
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if self.pos == len(self.text):
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return False
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if self.text[self.pos] in ["\x1a", "\x04"]:
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# end of file characters
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self.pos += 1
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continue
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if self.text[self.pos:self.pos + 2] == "//":
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while (self.pos < len(self.text)
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and self.text[self.pos] != "\n"):
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self.pos += 1
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if self.pos == len(self.text):
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return False
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if not crossline:
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return False
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continue
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return True
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return False
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def getToken(self, crossline=False):
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if self.unget:
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self.unget = False
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return self.token
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if not self.tokenAvailable(crossline):
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if not crossline:
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self.error("line is incomplete")
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return None
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if self.text[self.pos] == "\"":
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self.pos += 1
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start = self.pos
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if self.text[self.pos] == len(self.text):
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self.error("EOF inside quoted string")
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while self.text[self.pos] != "\"":
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if self.pos == len(self.text):
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self.error("EOF inside quoted string")
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return None
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if self.text[self.pos] == "\n":
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self.line += 1
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self.pos += 1
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self.token = self.text[start:self.pos]
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self.pos += 1
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else:
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start = self.pos
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if self.text[self.pos] in self.single:
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self.pos += 1
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else:
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while (self.pos < len(self.text)
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and not self.text[self.pos].isspace()
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and self.text[self.pos] not in self.single):
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self.pos += 1
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self.token = self.text[start:self.pos]
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return self.token
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def ungetToken(self):
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self.unget = True
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