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Copy pathaligned_indent.py
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138 lines (118 loc) · 5.1 KB
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# -*- coding: utf-8 -*-
#
# Copyright (C) 2009-2018 the sqlparse authors and contributors
# <see AUTHORS file>
#
# This module is part of python-sqlparse and is released under
# the BSD License: https://opensource.org/licenses/BSD-3-Clause
from sqlparse import sql, tokens as T
from sqlparse.compat import text_type
from sqlparse.utils import offset, indent
class AlignedIndentFilter(object):
join_words = (r'((LEFT\s+|RIGHT\s+|FULL\s+)?'
r'(INNER\s+|OUTER\s+|STRAIGHT\s+)?|'
r'(CROSS\s+|NATURAL\s+)?)?JOIN\b')
by_words = r'(GROUP|ORDER)\s+BY\b'
split_words = ('FROM',
join_words, 'ON', by_words,
'WHERE', 'AND', 'OR',
'HAVING', 'LIMIT',
'UNION', 'VALUES',
'SET', 'BETWEEN', 'EXCEPT')
def __init__(self, char=' ', n='\n'):
self.n = n
self.offset = 0
self.indent = 0
self.char = char
self._max_kwd_len = len('select')
def nl(self, offset=1):
# offset = 1 represent a single space after SELECT
offset = -len(offset) if not isinstance(offset, int) else offset
# add two for the space and parenthesis
indent = self.indent * (2 + self._max_kwd_len)
return sql.Token(T.Whitespace, self.n + self.char * (
self._max_kwd_len + offset + indent + self.offset))
def _process_statement(self, tlist):
if len(tlist.tokens) > 0 and tlist.tokens[0].is_whitespace \
and self.indent == 0:
tlist.tokens.pop(0)
# process the main query body
self._process(sql.TokenList(tlist.tokens))
def _process_parenthesis(self, tlist):
# if this isn't a subquery, don't re-indent
_, token = tlist.token_next_by(m=(T.DML, 'SELECT'))
if token is not None:
with indent(self):
tlist.insert_after(tlist[0], self.nl('SELECT'))
# process the inside of the parenthesis
self._process_default(tlist)
# de-indent last parenthesis
tlist.insert_before(tlist[-1], self.nl())
def _process_identifierlist(self, tlist):
# columns being selected
identifiers = list(tlist.get_identifiers())
identifiers.pop(0)
[tlist.insert_before(token, self.nl()) for token in identifiers]
self._process_default(tlist)
def _process_case(self, tlist):
offset_ = len('case ') + len('when ')
cases = tlist.get_cases(skip_ws=True)
# align the end as well
end_token = tlist.token_next_by(m=(T.Keyword, 'END'))[1]
cases.append((None, [end_token]))
condition_width = [len(' '.join(map(text_type, cond))) if cond else 0
for cond, _ in cases]
max_cond_width = max(condition_width)
for i, (cond, value) in enumerate(cases):
# cond is None when 'else or end'
stmt = cond[0] if cond else value[0]
if i > 0:
tlist.insert_before(stmt, self.nl(
offset_ - len(text_type(stmt))))
if cond:
ws = sql.Token(T.Whitespace, self.char * (
max_cond_width - condition_width[i]))
tlist.insert_after(cond[-1], ws)
def _next_token(self, tlist, idx=-1):
split_words = T.Keyword, self.split_words, True
tidx, token = tlist.token_next_by(m=split_words, idx=idx)
# treat "BETWEEN x and y" as a single statement
if token and token.normalized == 'BETWEEN':
tidx, token = self._next_token(tlist, tidx)
if token and token.normalized == 'AND':
tidx, token = self._next_token(tlist, tidx)
return tidx, token
def _split_kwds(self, tlist):
tidx, token = self._next_token(tlist)
while token:
# joins, group/order by are special case. only consider the first
# word as aligner
if (
token.match(T.Keyword, self.join_words, regex=True) or
token.match(T.Keyword, self.by_words, regex=True)
):
token_indent = token.value.split()[0]
else:
token_indent = text_type(token)
tlist.insert_before(token, self.nl(token_indent))
tidx += 1
tidx, token = self._next_token(tlist, tidx)
def _process_default(self, tlist):
self._split_kwds(tlist)
# process any sub-sub statements
for sgroup in tlist.get_sublists():
idx = tlist.token_index(sgroup)
pidx, prev_ = tlist.token_prev(idx)
# HACK: make "group/order by" work. Longer than max_len.
offset_ = 3 if (
prev_ and prev_.match(T.Keyword, self.by_words, regex=True)
) else 0
with offset(self, offset_):
self._process(sgroup)
def _process(self, tlist):
func_name = '_process_{cls}'.format(cls=type(tlist).__name__)
func = getattr(self, func_name.lower(), self._process_default)
func(tlist)
def process(self, stmt):
self._process(stmt)
return stmt