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343 lines
10 KiB
343 lines
10 KiB
5 years ago
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import re, sys
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from .core import TomlError
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from .utils import rfc3339_re, parse_rfc3339_re
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if sys.version_info[0] == 2:
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_chr = unichr
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else:
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_chr = chr
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def load(fin, translate=lambda t, x, v: v, object_pairs_hook=dict):
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return loads(fin.read(), translate=translate, object_pairs_hook=object_pairs_hook, filename=getattr(fin, 'name', repr(fin)))
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def loads(s, filename='<string>', translate=lambda t, x, v: v, object_pairs_hook=dict):
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if isinstance(s, bytes):
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s = s.decode('utf-8')
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s = s.replace('\r\n', '\n')
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root = object_pairs_hook()
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tables = object_pairs_hook()
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scope = root
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src = _Source(s, filename=filename)
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ast = _p_toml(src, object_pairs_hook=object_pairs_hook)
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def error(msg):
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raise TomlError(msg, pos[0], pos[1], filename)
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def process_value(v, object_pairs_hook):
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kind, text, value, pos = v
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if kind == 'array':
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if value and any(k != value[0][0] for k, t, v, p in value[1:]):
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error('array-type-mismatch')
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value = [process_value(item, object_pairs_hook=object_pairs_hook) for item in value]
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elif kind == 'table':
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value = object_pairs_hook([(k, process_value(value[k], object_pairs_hook=object_pairs_hook)) for k in value])
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return translate(kind, text, value)
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for kind, value, pos in ast:
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if kind == 'kv':
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k, v = value
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if k in scope:
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error('duplicate_keys. Key "{0}" was used more than once.'.format(k))
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scope[k] = process_value(v, object_pairs_hook=object_pairs_hook)
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else:
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is_table_array = (kind == 'table_array')
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cur = tables
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for name in value[:-1]:
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if isinstance(cur.get(name), list):
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d, cur = cur[name][-1]
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else:
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d, cur = cur.setdefault(name, (None, object_pairs_hook()))
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scope = object_pairs_hook()
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name = value[-1]
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if name not in cur:
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if is_table_array:
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cur[name] = [(scope, object_pairs_hook())]
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else:
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cur[name] = (scope, object_pairs_hook())
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elif isinstance(cur[name], list):
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if not is_table_array:
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error('table_type_mismatch')
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cur[name].append((scope, object_pairs_hook()))
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else:
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if is_table_array:
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error('table_type_mismatch')
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old_scope, next_table = cur[name]
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if old_scope is not None:
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error('duplicate_tables')
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cur[name] = (scope, next_table)
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def merge_tables(scope, tables):
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if scope is None:
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scope = object_pairs_hook()
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for k in tables:
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if k in scope:
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error('key_table_conflict')
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v = tables[k]
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if isinstance(v, list):
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scope[k] = [merge_tables(sc, tbl) for sc, tbl in v]
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else:
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scope[k] = merge_tables(v[0], v[1])
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return scope
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return merge_tables(root, tables)
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class _Source:
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def __init__(self, s, filename=None):
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self.s = s
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self._pos = (1, 1)
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self._last = None
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self._filename = filename
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self.backtrack_stack = []
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def last(self):
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return self._last
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def pos(self):
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return self._pos
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def fail(self):
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return self._expect(None)
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def consume_dot(self):
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if self.s:
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self._last = self.s[0]
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self.s = self[1:]
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self._advance(self._last)
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return self._last
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return None
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def expect_dot(self):
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return self._expect(self.consume_dot())
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def consume_eof(self):
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if not self.s:
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self._last = ''
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return True
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return False
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def expect_eof(self):
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return self._expect(self.consume_eof())
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def consume(self, s):
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if self.s.startswith(s):
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self.s = self.s[len(s):]
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self._last = s
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self._advance(s)
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return True
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return False
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def expect(self, s):
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return self._expect(self.consume(s))
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def consume_re(self, re):
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m = re.match(self.s)
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if m:
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self.s = self.s[len(m.group(0)):]
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self._last = m
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self._advance(m.group(0))
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return m
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return None
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def expect_re(self, re):
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return self._expect(self.consume_re(re))
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def __enter__(self):
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self.backtrack_stack.append((self.s, self._pos))
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def __exit__(self, type, value, traceback):
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if type is None:
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self.backtrack_stack.pop()
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else:
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self.s, self._pos = self.backtrack_stack.pop()
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return type == TomlError
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def commit(self):
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self.backtrack_stack[-1] = (self.s, self._pos)
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def _expect(self, r):
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if not r:
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raise TomlError('msg', self._pos[0], self._pos[1], self._filename)
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return r
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def _advance(self, s):
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suffix_pos = s.rfind('\n')
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if suffix_pos == -1:
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self._pos = (self._pos[0], self._pos[1] + len(s))
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else:
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self._pos = (self._pos[0] + s.count('\n'), len(s) - suffix_pos)
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_ews_re = re.compile(r'(?:[ \t]|#[^\n]*\n|#[^\n]*\Z|\n)*')
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def _p_ews(s):
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s.expect_re(_ews_re)
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_ws_re = re.compile(r'[ \t]*')
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def _p_ws(s):
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s.expect_re(_ws_re)
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_escapes = { 'b': '\b', 'n': '\n', 'r': '\r', 't': '\t', '"': '"',
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'\\': '\\', 'f': '\f' }
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_basicstr_re = re.compile(r'[^"\\\000-\037]*')
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_short_uni_re = re.compile(r'u([0-9a-fA-F]{4})')
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_long_uni_re = re.compile(r'U([0-9a-fA-F]{8})')
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_escapes_re = re.compile(r'[btnfr\"\\]')
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_newline_esc_re = re.compile('\n[ \t\n]*')
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def _p_basicstr_content(s, content=_basicstr_re):
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res = []
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while True:
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res.append(s.expect_re(content).group(0))
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if not s.consume('\\'):
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break
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if s.consume_re(_newline_esc_re):
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pass
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elif s.consume_re(_short_uni_re) or s.consume_re(_long_uni_re):
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v = int(s.last().group(1), 16)
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if 0xd800 <= v < 0xe000:
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s.fail()
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res.append(_chr(v))
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else:
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s.expect_re(_escapes_re)
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res.append(_escapes[s.last().group(0)])
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return ''.join(res)
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_key_re = re.compile(r'[0-9a-zA-Z-_]+')
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def _p_key(s):
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with s:
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s.expect('"')
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r = _p_basicstr_content(s, _basicstr_re)
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s.expect('"')
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return r
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if s.consume('\''):
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if s.consume('\'\''):
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s.consume('\n')
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r = s.expect_re(_litstr_ml_re).group(0)
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s.expect('\'\'\'')
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else:
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r = s.expect_re(_litstr_re).group(0)
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s.expect('\'')
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return r
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return s.expect_re(_key_re).group(0)
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_float_re = re.compile(r'[+-]?(?:0|[1-9](?:_?\d)*)(?:\.\d(?:_?\d)*)?(?:[eE][+-]?(?:\d(?:_?\d)*))?')
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_basicstr_ml_re = re.compile(r'(?:""?(?!")|[^"\\\000-\011\013-\037])*')
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_litstr_re = re.compile(r"[^'\000\010\012-\037]*")
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_litstr_ml_re = re.compile(r"(?:(?:|'|'')(?:[^'\000-\010\013-\037]))*")
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def _p_value(s, object_pairs_hook):
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pos = s.pos()
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if s.consume('true'):
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return 'bool', s.last(), True, pos
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if s.consume('false'):
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return 'bool', s.last(), False, pos
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if s.consume('"'):
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if s.consume('""'):
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s.consume('\n')
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r = _p_basicstr_content(s, _basicstr_ml_re)
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s.expect('"""')
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else:
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r = _p_basicstr_content(s, _basicstr_re)
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s.expect('"')
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return 'str', r, r, pos
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if s.consume('\''):
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if s.consume('\'\''):
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s.consume('\n')
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r = s.expect_re(_litstr_ml_re).group(0)
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s.expect('\'\'\'')
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else:
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r = s.expect_re(_litstr_re).group(0)
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s.expect('\'')
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return 'str', r, r, pos
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if s.consume_re(rfc3339_re):
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m = s.last()
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return 'datetime', m.group(0), parse_rfc3339_re(m), pos
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if s.consume_re(_float_re):
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m = s.last().group(0)
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r = m.replace('_','')
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if '.' in m or 'e' in m or 'E' in m:
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return 'float', m, float(r), pos
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else:
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return 'int', m, int(r, 10), pos
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if s.consume('['):
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items = []
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with s:
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while True:
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_p_ews(s)
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items.append(_p_value(s, object_pairs_hook=object_pairs_hook))
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s.commit()
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_p_ews(s)
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s.expect(',')
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s.commit()
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_p_ews(s)
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s.expect(']')
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return 'array', None, items, pos
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if s.consume('{'):
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_p_ws(s)
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items = object_pairs_hook()
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if not s.consume('}'):
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k = _p_key(s)
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_p_ws(s)
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s.expect('=')
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_p_ws(s)
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items[k] = _p_value(s, object_pairs_hook=object_pairs_hook)
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_p_ws(s)
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while s.consume(','):
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_p_ws(s)
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k = _p_key(s)
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_p_ws(s)
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s.expect('=')
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_p_ws(s)
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items[k] = _p_value(s, object_pairs_hook=object_pairs_hook)
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_p_ws(s)
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s.expect('}')
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return 'table', None, items, pos
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s.fail()
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def _p_stmt(s, object_pairs_hook):
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pos = s.pos()
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if s.consume( '['):
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is_array = s.consume('[')
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_p_ws(s)
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keys = [_p_key(s)]
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_p_ws(s)
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while s.consume('.'):
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_p_ws(s)
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keys.append(_p_key(s))
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_p_ws(s)
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s.expect(']')
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if is_array:
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s.expect(']')
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return 'table_array' if is_array else 'table', keys, pos
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key = _p_key(s)
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_p_ws(s)
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s.expect('=')
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_p_ws(s)
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value = _p_value(s, object_pairs_hook=object_pairs_hook)
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return 'kv', (key, value), pos
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_stmtsep_re = re.compile(r'(?:[ \t]*(?:#[^\n]*)?\n)+[ \t]*')
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def _p_toml(s, object_pairs_hook):
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stmts = []
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_p_ews(s)
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with s:
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stmts.append(_p_stmt(s, object_pairs_hook=object_pairs_hook))
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while True:
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s.commit()
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s.expect_re(_stmtsep_re)
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stmts.append(_p_stmt(s, object_pairs_hook=object_pairs_hook))
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_p_ews(s)
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s.expect_eof()
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return stmts
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