455 lines
13 KiB
Python
455 lines
13 KiB
Python
#
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# Copyright (C) 2009-2020 the sqlparse authors and contributors
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# <see AUTHORS file>
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#
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# This module is part of python-sqlparse and is released under
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# the BSD License: https://opensource.org/licenses/BSD-3-Clause
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from sqlparse import sql
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from sqlparse import tokens as T
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from sqlparse.utils import recurse, imt
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T_NUMERICAL = (T.Number, T.Number.Integer, T.Number.Float)
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T_STRING = (T.String, T.String.Single, T.String.Symbol)
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T_NAME = (T.Name, T.Name.Placeholder)
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def _group_matching(tlist, cls):
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"""Groups Tokens that have beginning and end."""
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opens = []
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tidx_offset = 0
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for idx, token in enumerate(list(tlist)):
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tidx = idx - tidx_offset
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if token.is_whitespace:
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# ~50% of tokens will be whitespace. Will checking early
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# for them avoid 3 comparisons, but then add 1 more comparison
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# for the other ~50% of tokens...
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continue
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if token.is_group and not isinstance(token, cls):
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# Check inside previously grouped (i.e. parenthesis) if group
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# of different type is inside (i.e., case). though ideally should
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# should check for all open/close tokens at once to avoid recursion
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_group_matching(token, cls)
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continue
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if token.match(*cls.M_OPEN):
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opens.append(tidx)
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elif token.match(*cls.M_CLOSE):
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try:
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open_idx = opens.pop()
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except IndexError:
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# this indicates invalid sql and unbalanced tokens.
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# instead of break, continue in case other "valid" groups exist
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continue
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close_idx = tidx
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tlist.group_tokens(cls, open_idx, close_idx)
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tidx_offset += close_idx - open_idx
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def group_brackets(tlist):
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_group_matching(tlist, sql.SquareBrackets)
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def group_parenthesis(tlist):
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_group_matching(tlist, sql.Parenthesis)
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def group_case(tlist):
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_group_matching(tlist, sql.Case)
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def group_if(tlist):
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_group_matching(tlist, sql.If)
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def group_for(tlist):
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_group_matching(tlist, sql.For)
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def group_begin(tlist):
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_group_matching(tlist, sql.Begin)
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def group_typecasts(tlist):
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def match(token):
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return token.match(T.Punctuation, '::')
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def valid(token):
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return token is not None
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def post(tlist, pidx, tidx, nidx):
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return pidx, nidx
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valid_prev = valid_next = valid
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_group(tlist, sql.Identifier, match, valid_prev, valid_next, post)
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def group_tzcasts(tlist):
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def match(token):
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return token.ttype == T.Keyword.TZCast
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def valid(token):
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return token is not None
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def post(tlist, pidx, tidx, nidx):
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return pidx, nidx
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_group(tlist, sql.Identifier, match, valid, valid, post)
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def group_typed_literal(tlist):
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# definitely not complete, see e.g.:
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# https://docs.microsoft.com/en-us/sql/odbc/reference/appendixes/interval-literal-syntax
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# https://docs.microsoft.com/en-us/sql/odbc/reference/appendixes/interval-literals
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# https://www.postgresql.org/docs/9.1/datatype-datetime.html
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# https://www.postgresql.org/docs/9.1/functions-datetime.html
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def match(token):
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return imt(token, m=sql.TypedLiteral.M_OPEN)
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def match_to_extend(token):
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return isinstance(token, sql.TypedLiteral)
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def valid_prev(token):
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return token is not None
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def valid_next(token):
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return token is not None and token.match(*sql.TypedLiteral.M_CLOSE)
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def valid_final(token):
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return token is not None and token.match(*sql.TypedLiteral.M_EXTEND)
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def post(tlist, pidx, tidx, nidx):
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return tidx, nidx
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_group(tlist, sql.TypedLiteral, match, valid_prev, valid_next,
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post, extend=False)
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_group(tlist, sql.TypedLiteral, match_to_extend, valid_prev, valid_final,
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post, extend=True)
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def group_period(tlist):
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def match(token):
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return token.match(T.Punctuation, '.')
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def valid_prev(token):
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sqlcls = sql.SquareBrackets, sql.Identifier
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ttypes = T.Name, T.String.Symbol
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return imt(token, i=sqlcls, t=ttypes)
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def valid_next(token):
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# issue261, allow invalid next token
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return True
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def post(tlist, pidx, tidx, nidx):
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# next_ validation is being performed here. issue261
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sqlcls = sql.SquareBrackets, sql.Function
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ttypes = T.Name, T.String.Symbol, T.Wildcard
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next_ = tlist[nidx] if nidx is not None else None
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valid_next = imt(next_, i=sqlcls, t=ttypes)
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return (pidx, nidx) if valid_next else (pidx, tidx)
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_group(tlist, sql.Identifier, match, valid_prev, valid_next, post)
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def group_as(tlist):
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def match(token):
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return token.is_keyword and token.normalized == 'AS'
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def valid_prev(token):
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return token.normalized == 'NULL' or not token.is_keyword
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def valid_next(token):
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ttypes = T.DML, T.DDL, T.CTE
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return not imt(token, t=ttypes) and token is not None
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def post(tlist, pidx, tidx, nidx):
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return pidx, nidx
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_group(tlist, sql.Identifier, match, valid_prev, valid_next, post)
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def group_assignment(tlist):
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def match(token):
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return token.match(T.Assignment, ':=')
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def valid(token):
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return token is not None and token.ttype not in (T.Keyword)
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def post(tlist, pidx, tidx, nidx):
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m_semicolon = T.Punctuation, ';'
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snidx, _ = tlist.token_next_by(m=m_semicolon, idx=nidx)
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nidx = snidx or nidx
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return pidx, nidx
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valid_prev = valid_next = valid
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_group(tlist, sql.Assignment, match, valid_prev, valid_next, post)
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def group_comparison(tlist):
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sqlcls = (sql.Parenthesis, sql.Function, sql.Identifier,
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sql.Operation, sql.TypedLiteral)
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ttypes = T_NUMERICAL + T_STRING + T_NAME
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def match(token):
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return token.ttype == T.Operator.Comparison
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def valid(token):
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if imt(token, t=ttypes, i=sqlcls):
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return True
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elif token and token.is_keyword and token.normalized == 'NULL':
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return True
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else:
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return False
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def post(tlist, pidx, tidx, nidx):
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return pidx, nidx
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valid_prev = valid_next = valid
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_group(tlist, sql.Comparison, match,
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valid_prev, valid_next, post, extend=False)
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@recurse(sql.Identifier)
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def group_identifier(tlist):
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ttypes = (T.String.Symbol, T.Name)
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tidx, token = tlist.token_next_by(t=ttypes)
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while token:
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tlist.group_tokens(sql.Identifier, tidx, tidx)
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tidx, token = tlist.token_next_by(t=ttypes, idx=tidx)
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def group_arrays(tlist):
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sqlcls = sql.SquareBrackets, sql.Identifier, sql.Function
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ttypes = T.Name, T.String.Symbol
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def match(token):
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return isinstance(token, sql.SquareBrackets)
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def valid_prev(token):
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return imt(token, i=sqlcls, t=ttypes)
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def valid_next(token):
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return True
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def post(tlist, pidx, tidx, nidx):
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return pidx, tidx
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_group(tlist, sql.Identifier, match,
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valid_prev, valid_next, post, extend=True, recurse=False)
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def group_operator(tlist):
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ttypes = T_NUMERICAL + T_STRING + T_NAME
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sqlcls = (sql.SquareBrackets, sql.Parenthesis, sql.Function,
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sql.Identifier, sql.Operation, sql.TypedLiteral)
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def match(token):
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return imt(token, t=(T.Operator, T.Wildcard))
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def valid(token):
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return imt(token, i=sqlcls, t=ttypes) \
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or (token and token.match(
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T.Keyword,
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('CURRENT_DATE', 'CURRENT_TIME', 'CURRENT_TIMESTAMP')))
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def post(tlist, pidx, tidx, nidx):
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tlist[tidx].ttype = T.Operator
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return pidx, nidx
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valid_prev = valid_next = valid
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_group(tlist, sql.Operation, match,
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valid_prev, valid_next, post, extend=False)
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def group_identifier_list(tlist):
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m_role = T.Keyword, ('null', 'role')
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sqlcls = (sql.Function, sql.Case, sql.Identifier, sql.Comparison,
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sql.IdentifierList, sql.Operation)
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ttypes = (T_NUMERICAL + T_STRING + T_NAME
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+ (T.Keyword, T.Comment, T.Wildcard))
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def match(token):
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return token.match(T.Punctuation, ',')
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def valid(token):
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return imt(token, i=sqlcls, m=m_role, t=ttypes)
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def post(tlist, pidx, tidx, nidx):
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return pidx, nidx
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valid_prev = valid_next = valid
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_group(tlist, sql.IdentifierList, match,
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valid_prev, valid_next, post, extend=True)
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@recurse(sql.Comment)
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def group_comments(tlist):
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tidx, token = tlist.token_next_by(t=T.Comment)
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while token:
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eidx, end = tlist.token_not_matching(
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lambda tk: imt(tk, t=T.Comment) or tk.is_whitespace, idx=tidx)
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if end is not None:
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eidx, end = tlist.token_prev(eidx, skip_ws=False)
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tlist.group_tokens(sql.Comment, tidx, eidx)
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tidx, token = tlist.token_next_by(t=T.Comment, idx=tidx)
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@recurse(sql.Where)
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def group_where(tlist):
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tidx, token = tlist.token_next_by(m=sql.Where.M_OPEN)
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while token:
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eidx, end = tlist.token_next_by(m=sql.Where.M_CLOSE, idx=tidx)
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if end is None:
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end = tlist._groupable_tokens[-1]
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else:
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end = tlist.tokens[eidx - 1]
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# TODO: convert this to eidx instead of end token.
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# i think above values are len(tlist) and eidx-1
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eidx = tlist.token_index(end)
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tlist.group_tokens(sql.Where, tidx, eidx)
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tidx, token = tlist.token_next_by(m=sql.Where.M_OPEN, idx=tidx)
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@recurse()
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def group_aliased(tlist):
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I_ALIAS = (sql.Parenthesis, sql.Function, sql.Case, sql.Identifier,
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sql.Operation, sql.Comparison)
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tidx, token = tlist.token_next_by(i=I_ALIAS, t=T.Number)
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while token:
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nidx, next_ = tlist.token_next(tidx)
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if isinstance(next_, sql.Identifier):
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tlist.group_tokens(sql.Identifier, tidx, nidx, extend=True)
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tidx, token = tlist.token_next_by(i=I_ALIAS, t=T.Number, idx=tidx)
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@recurse(sql.Function)
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def group_functions(tlist):
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has_create = False
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has_table = False
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for tmp_token in tlist.tokens:
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if tmp_token.value == 'CREATE':
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has_create = True
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if tmp_token.value == 'TABLE':
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has_table = True
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if has_create and has_table:
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return
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tidx, token = tlist.token_next_by(t=T.Name)
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while token:
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nidx, next_ = tlist.token_next(tidx)
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if isinstance(next_, sql.Parenthesis):
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tlist.group_tokens(sql.Function, tidx, nidx)
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tidx, token = tlist.token_next_by(t=T.Name, idx=tidx)
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def group_order(tlist):
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"""Group together Identifier and Asc/Desc token"""
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tidx, token = tlist.token_next_by(t=T.Keyword.Order)
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while token:
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pidx, prev_ = tlist.token_prev(tidx)
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if imt(prev_, i=sql.Identifier, t=T.Number):
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tlist.group_tokens(sql.Identifier, pidx, tidx)
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tidx = pidx
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tidx, token = tlist.token_next_by(t=T.Keyword.Order, idx=tidx)
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@recurse()
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def align_comments(tlist):
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tidx, token = tlist.token_next_by(i=sql.Comment)
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while token:
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pidx, prev_ = tlist.token_prev(tidx)
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if isinstance(prev_, sql.TokenList):
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tlist.group_tokens(sql.TokenList, pidx, tidx, extend=True)
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tidx = pidx
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tidx, token = tlist.token_next_by(i=sql.Comment, idx=tidx)
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def group_values(tlist):
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tidx, token = tlist.token_next_by(m=(T.Keyword, 'VALUES'))
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start_idx = tidx
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end_idx = -1
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while token:
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if isinstance(token, sql.Parenthesis):
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end_idx = tidx
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tidx, token = tlist.token_next(tidx)
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if end_idx != -1:
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tlist.group_tokens(sql.Values, start_idx, end_idx, extend=True)
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def group(stmt):
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for func in [
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group_comments,
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# _group_matching
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group_brackets,
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group_parenthesis,
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group_case,
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group_if,
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group_for,
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group_begin,
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group_functions,
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group_where,
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group_period,
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group_arrays,
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group_identifier,
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group_order,
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group_typecasts,
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group_tzcasts,
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group_typed_literal,
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group_operator,
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group_comparison,
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group_as,
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group_aliased,
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group_assignment,
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align_comments,
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group_identifier_list,
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group_values,
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]:
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func(stmt)
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return stmt
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def _group(tlist, cls, match,
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valid_prev=lambda t: True,
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valid_next=lambda t: True,
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post=None,
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extend=True,
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recurse=True
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):
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"""Groups together tokens that are joined by a middle token. i.e. x < y"""
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tidx_offset = 0
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pidx, prev_ = None, None
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for idx, token in enumerate(list(tlist)):
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tidx = idx - tidx_offset
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if tidx < 0: # tidx shouldn't get negative
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continue
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if token.is_whitespace:
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continue
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if recurse and token.is_group and not isinstance(token, cls):
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_group(token, cls, match, valid_prev, valid_next, post, extend)
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if match(token):
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nidx, next_ = tlist.token_next(tidx)
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if prev_ and valid_prev(prev_) and valid_next(next_):
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from_idx, to_idx = post(tlist, pidx, tidx, nidx)
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grp = tlist.group_tokens(cls, from_idx, to_idx, extend=extend)
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tidx_offset += to_idx - from_idx
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pidx, prev_ = from_idx, grp
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continue
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pidx, prev_ = tidx, token
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