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#!/usr/bin/env python3
#******************************************************************************
# Copyright (C) 2018 Thomas "Cakeisalie5" Touhey <thomas@touhey.fr>
# This file is part of the textoutpc project, which is MIT-licensed.
#******************************************************************************
""" Layer on top of the character stream.
See the `TextoutStream` class description for more information.
"""
import io as _io
import regex as _re
__all__ = ["TextoutStream", "TextoutUnit"]
# ---
# Class definitions.
# ---
class TextoutUnit:
""" Raw textout stream unit. """
BEGIN = 1
END = 2
SPECIAL = 3
NEWLINE = 4
PARSEP = 5
def __init__(self, *args):
if len(args) > 1:
self.type, self.name, self.value, *_ = args + (None,)
return
result = args[0]
gr = result.groupdict()
self.name = None
self.value = None
if gr['sname'] == '\n':
self.type = self.NEWLINE
elif gr['parsep'] != None:
self.type = self.PARSEP
elif gr['bname'] != None:
self.type = self.BEGIN
self.name = gr['bname']
self.value = gr['value']
self.full = "[{}{}]".format(self.name,
"=" + self.value if self.value != None else "")
elif gr['ename'] != None:
self.type = self.END
self.name = gr['ename']
self.full = "[/" + self.name + "]"
else:
self.type = self.SPECIAL
self.name = gr['sname']
self.full = self.name
if self.name != None:
self.name = self.name.lower()
if self.type != self.SPECIAL:
self.name = "[{}]".format(self.name)
def __repr__(self):
typetab = {self.BEGIN: "begin", self.END: "end",
self.SPECIAL: "special", self.NEWLINE: "newline"}
return '_TextoutUnit(type={}{}{})'.format(\
typetab[self.type],
', name=' + repr(self.name) if self.name != None else "",
', value=' + repr(self.value) if self.value != None else "")
def __equ__(self, other):
if not isinstance(other, TextoutUnit):
return False
if self.type == other.type \
and (self.type == self.NEWLINE or self.name == other.name) \
and (self.type != self.BEGIN or self.value == other.value):
return False
return True
class TextoutStream:
""" Textout stream, for easier stream processing.
The idea behind this stream is that it will provide more suitable
(therefore easier to process) data for the applications above,
with raw text and tags. """
# A tag can basically be one of the following things:
# - a starting tag, looking like [<name>] or [<name>=<attribute>]
# - an ending tag, looking like [/<name>]
# - a special tag (starting or ending), usually one-char (the only
# one currently available is the ` tag).
#
# A tag name is 32 chars at most (at least 1 char).
# A closing tag can have no name, which means that it will close the
# last opened tag automatically.
# A tag attribute is 256 chars at most.
#
# FIXME: check the sizes? it seems that it stopped working…
_Tag = _re.compile("""\
\[\s?
(?P<bname>
(?P<bname_e>[^\/\[\]\=][^\[\]\=]* (\[(?&bname_e)\]?)*)*
)
(\s?=\s?(?P<value>
(?P<value_e>[^\[\]]* (\[(?&value_e)\]?)*)*
))?
\s?\]
|
\[[\\\/]\s?(?P<ename>
(?P<ename_e>[^\/\[\]\=][^\[\]\=]* (\[(?&ename_e)\]?)*)*
)\s?\]
|
(?P<parsep>[\n]{2,})
|
(?P<sname>`|[\n])
""", _re.VERBOSE | _re.DOTALL | _re.MULTILINE)
# Keep this buffer size above the maximum size of a tag (387)
# for this class to work alright. Anything above 512 should work great.
BUFFER_SIZE = 1024
def __init__(self, stream):
# If the 'stream' is a string, we want to use standard stream
# functions, so we're gonna enforce them using the `StringIO` class.
if isinstance(stream, str):
stream = _io.StringIO(stream)
# Buffer management.
self.stream = stream
self.buf = ""
# Management of the last tag match.
self.result = None
self.last = None
# Error position.
self.pos = 0
self.line = 0
self.col = 0
def __iter__(self):
# This class is (obviously) iterable.
# We want to use this class as the iterator as well.
return self
def __next__(self):
# If we have a result, process it.
if self.result:
data, self.result = TextoutUnit(self.result), None
self.last = data
return data
# Make sure to have enough data to read.
self.buf += self.stream.read(self.BUFFER_SIZE - len(self.buf))
if not self.buf:
self.last = None
raise StopIteration
# Check that we have a result.
result = self._Tag.search(self.buf, partial = True)
if not result:
text = self.buf
self.buf = ''
self.last = text
return text
# If there is some text, return it.
# Eventually store the result so we can process it later.
if result.start() > 0:
ret = self.buf[:result.start()]
self.buf = self.buf[result.end():]
if not result.partial:
self.result = result
self.last = ret
return ret
# Process the result now!
self.buf = self.buf[result.end():]
data = TextoutUnit(result)
self.last = data
return data
# End of file.
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