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self._s = s
self._index = 0
self._mark = 0
self._line = 1
self._col = 1
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self._update_cur()
def __bool__(self):
return self.cur is not None
def __len__(self):
return len(self._s[self._index:])
def __getitem__(self, item):
return self._s[self._index:][item]
def next(self, l=1):
for ch in self[:l]:
if ch == '\n':
self._line += 1
self._col = 1
else:
self._col += 1
self._index += l
self._update_cur()
def mark(self):
self._mark = self._index
self._mark_pos = self._line, self._col
def rollback(self):
self._index = self._mark
self._line, self._col = self._mark_pos
self._update_cur()
def commit(self, type=None, text=None):
tok = self._s[self._mark:self._index]
pos = (self._mark_pos, (self._line, self._col))
if type is None:
type = tok
if text is None:
text = tok
return type, text, pos
def error(self, message):
raise TomlError(message, self._line, self._col, self._filename)
def _update_cur(self):
self.tail = self._s[self._index:]
if self._index < len(self._s):
self.cur = self._s[self._index]
else:
self.cur = None
if sys.version_info[0] == 2:
_chr = unichr
else:
_chr = chr
_datetime_re = re.compile(r'(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2})(\.\d+)?(?:Z|([+-]\d{2}):(\d{2}))')
def _lex(s, filename):
src = _CharSource(s.replace('\r\n', '\n'), filename)
def is_id(ch):
return ch is not None and (ch.isalnum() or ch in '-_')
def is_ws(ch):
return ch is not None and ch in ' \t'
def fetch_esc():
escapes = {'b':'\b', 't':'\t', 'n':'\n', 'f':'\f', 'r':'\r', '"':'"', '\\':'\\'}
if src.cur == 'u':
if len(src) < 5 or any(ch not in string.hexdigits for ch in src[1:5]):
src.error('invalid_escape_sequence')
src.next(5)
elif src.cur == 'U':
if len(src) < 9 or any(ch not in string.hexdigits for ch in src[1:9]):
src.error('invalid_escape_sequence')
src.next(9)
elif src.cur == '\n':
while src and src.cur in ' \n\t':
src.next()
res = ''
elif src.cur in escapes:
res = escapes[src.cur]
src.next(1)
else:
src.error('invalid_escape_sequence')
return res
def consume_datetime():
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if not m:
return False
src.next(len(m.group(0)))
return True
def consume_int():
if not src:
src.error('malformed')
if src.cur in '+-':
src.next()
if not src or src.cur not in '0123456789':
src.error('malformed')
while src and src.cur in '0123456789_':
src.next()
def consume_float():
consume_int()
type = 'int'
if src and src.cur == '.':
type = 'float'
src.next()
if not src or src.cur not in '0123456789_':
src.error('malformed_float')
while src and src.cur in '0123456789_':
src.next()
if src and src.cur in 'eE':
type = 'float'
src.next()
consume_int()
return type
while src:
src.mark()
if src.cur in ' \t':
src.next()
while src and src.cur in ' \t':
src.next()
elif src.cur == '#':
src.next()
while src and src.cur != '\n':
src.next()
elif src.cur in '0123456789':
if consume_datetime():
yield src.commit('datetime')
else:
src.rollback()
type = consume_float()
yield src.commit(type)
elif src.cur in '+-':
type = consume_float()
yield src.commit(type)
elif is_id(src.cur):
while is_id(src.cur):
src.next()
yield src.commit('id')
elif src.cur in '[]{}=.,\n':
src.next()
yield src.commit()
elif src.tail.startswith("'''"):
src.next(3)
if src.cur == '\n':
src.next()
end_quote = src.tail.find("'''")
if end_quote == -1:
src.error('unclosed_multiline_string')
text = src[:end_quote]
src.next(end_quote+3)
yield src.commit('str', text)
elif src.cur == "'":
src.next()
end_quote = src.tail.find("'")
if end_quote == -1:
src.error('unclosed_string')
text = src[:end_quote]
src.next(end_quote+1)
yield src.commit('str', text)
elif src.tail.startswith('"""'):
src.next(3)
if src.cur == '\n':
src.next()
res = []
while True:
src.mark()
end_quote = src.tail.find('"""')
if end_quote == -1:
src.error('unclosed_multiline_string')
esc_pos = src.tail.find('\\')
if esc_pos == -1 or esc_pos > end_quote:
res.append(src[:end_quote])
src.next(end_quote+3)
break
res.append(src[:esc_pos])
src.next(esc_pos+1)
res.append(fetch_esc())
yield src.commit('str', ''.join(res))
elif src.cur == '"':
src.next()
res = []
while True:
src.mark()
end_quote = src.tail.find('"')
if end_quote == -1:
src.error('unclosed_string')
esc_pos = src.tail.find('\\')
if esc_pos == -1 or esc_pos > end_quote:
res.append(src[:end_quote])
src.next(end_quote+1)
break
res.append(src[:esc_pos])
src.next(esc_pos+1)
res.append(fetch_esc())
yield src.commit('str', ''.join(res))
else:
src.error('unexpected_char')
src.mark()
yield src.commit('\n', '')
yield src.commit('eof', '')
class _TokSource:
def __init__(self, s, filename):
self._filename = filename
self._lex = iter(_lex(s, filename))
self.pos = None
self.next()
def next(self):
self.prev_pos = self.pos
self.tok, self.text, self.pos = next(self._lex)
def consume(self, kind):
if self.tok == kind:
self.next()
return True
return False
def consume_adjacent(self, kind):
if self.prev_pos is None or self.prev_pos[1] != self.pos[0]:
return False
return self.consume(kind)
def consume_nls(self):
while self.consume('\n'):
pass
def expect(self, kind, error_text):
if not self.consume(kind):
self.error(error_text)
def error(self, message):
raise TomlError(message, self.pos[0][0], self.pos[0][1], self._filename)
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def _translate_datetime(s):
match = _datetime_re.match(s)
re.compile(r'(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2})(\.\d+)?(?:Z|([+-]\d{2}):(\d{2}))')
y = int(match.group(1))
m = int(match.group(2))
d = int(match.group(3))
H = int(match.group(4))
M = int(match.group(5))
S = int(match.group(6))
if match.group(7) is not None:
micro = float(match.group(7))
else:
micro = 0
if match.group(8) is not None:
tzh = int(match.group(8))
tzm = int(match.group(9))
if tzh < 0:
tzm = -tzm
offs = tzh * 60 + tzm
else:
offs = 0
dt = datetime.datetime(y, m, d, H, M, S, int(micro * 1000000),
_TimeZone(datetime.timedelta(0, offs*60)))
return dt
def _translate_literal(type, text):
if type == 'bool':
return text == 'true'
elif type == 'int':
return int(text.replace('_', ''))
elif type == 'float':
return float(text.replace('_', ''))
elif type == 'str':
return text
elif type == 'datetime':
def _translate_array(a):
return a
def load(fin, translate_literal=_translate_literal, translate_array=_translate_array):
return loads(fin.read(),
translate_literal=translate_literal, translate_array=translate_array,
filename=fin.name)
def loads(s, translate_literal=_translate_literal, translate_array=_translate_array, filename='<string>'):
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def read_value():
while True:
if toks.tok == 'id':
if toks.text in ('true', 'false'):
value = translate_literal('bool', toks.text)
toks.next()
return 'bool', value
else:
toks.error('unexpected_identifier')
elif toks.tok in ('int', 'str', 'float', 'datetime'):
type = toks.tok
value = translate_literal(toks.tok, toks.text)
toks.next()
return type, value
elif toks.consume('['):
res = []
toks.consume_nls()
if not toks.consume(']'):
toks.consume_nls()
type, val = read_value()
res.append(val)
toks.consume_nls()
while toks.consume(','):
toks.consume_nls()
if toks.consume(']'):
break
cur_type, val = read_value()
if type != cur_type:
toks.error('heterogenous_array')
res.append(val)
toks.consume_nls()
else:
return 'array', translate_array(res)
elif toks.consume('{'):
res = {}
while toks.tok in ('id', 'str'):
k = toks.text
toks.next()
if k in res:
toks.error('duplicate_key')
type, v = read_value()
res[k] = v
if not toks.consume(','):
break
return 'table', res
else:
toks.error('unexpected_token')
root = {}
tables = {}
scope = root
while toks.tok != 'eof':
if toks.tok in ('id', 'str'):
k = toks.text
toks.next()
type, v = read_value()
if k in scope:
toks.error('duplicate_keys')
scope[k] = v
elif toks.consume('\n'):
pass
elif toks.consume('['):
is_table_array = toks.consume_adjacent('[')
path = []
if toks.tok not in ('id', 'str'):
toks.error('expected_table_name')
path.append(toks.text)
toks.next()
while toks.consume('.'):
if toks.tok not in ('id', 'str'):
toks.error('expected_table_name')
path.append(toks.text)
toks.next()
if not toks.consume(']') or (is_table_array and not toks.consume_adjacent(']')):
toks.error('malformed_table_name')
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cur = tables
for name in path[:-1]:
if isinstance(cur.get(name), list):
d, cur = cur[name][-1]
else:
d, cur = cur.setdefault(name, (None, {}))
scope = {}
name = path[-1]
if name not in cur:
if is_table_array:
cur[name] = [(scope, {})]
else:
cur[name] = (scope, {})
elif isinstance(cur[name], list):
if not is_table_array:
toks.error('table_type_mismatch')
cur[name].append((scope, {}))
else:
if is_table_array:
toks.error('table_type_mismatch')
old_scope, next_table = cur[name]
if old_scope is not None:
toks.error('duplicate_tables')
cur[name] = (scope, next_table)
else:
toks.error('unexpected')
def merge_tables(scope, tables):
if scope is None:
scope = {}
if isinstance(v, list):
scope[k] = [merge_tables(sc, tbl) for sc, tbl in v]
else:
scope[k] = merge_tables(v[0], v[1])
return scope
return merge_tables(root, tables)
class _TimeZone(datetime.tzinfo):
def __init__(self, offset):
self._offset = offset
def utcoffset(self, dt):
return self._offset
def dst(self, dt):
return None
def tzname(self, dt):
m = self._offset.total_seconds() // 60
if m < 0:
res = '-'
m = -m
else:
res = '+'
h = m // 60
m = m - h * 60
return '{}{:.02}{:.02}'.format(res, h, m)