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# -*- coding: utf-8 -*-
#
# Copyright (C) 2016 Andi Albrecht, albrecht.andi@gmail.com
#
# This module is part of python-sqlparse and is released under
# the BSD License: http://www.opensource.org/licenses/bsd-license.php
"""filter"""
from sqlparse import lexer
from sqlparse.engine import grouping
from sqlparse.engine.filter import StatementFilter
class FilterStack(object):
def __init__(self):
self.preprocess = []
self.stmtprocess = []
self.postprocess = []
self.split_statements = False
self._grouping = False
def enable_grouping(self):
self._grouping = True
def run(self, sql, encoding=None):
stream = lexer.tokenize(sql, encoding)
# Process token stream
if self.preprocess:
for filter_ in self.preprocess:
stream = filter_.process(self, stream)
if (self.stmtprocess or self.postprocess or
self.split_statements or self._grouping):
splitter = StatementFilter()
stream = splitter.process(self, stream)
if self._grouping:
def _group(stream):
for stmt in stream:
grouping.group(stmt)
yield stmt
stream = _group(stream)
if self.stmtprocess:
def _run1(stream):
ret = []
for stmt in stream:
for filter_ in self.stmtprocess:
filter_.process(self, stmt)
ret.append(stmt)
return ret
stream = _run1(stream)
if self.postprocess:
def _run2(stream):
for stmt in stream:
stmt.tokens = list(stmt.flatten())
for filter_ in self.postprocess:
stmt = filter_.process(self, stmt)
yield stmt
stream = _run2(stream)
return stream
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