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#!/usr/bin/python -tt
# This program is free software; you can redistribute it and/or modify
# it under the terms of version 2 of the GNU General Public License
# as published by the Free Software Foundation
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Library General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
# Copyright 2005 Duke University
"""
utility functions to handle differences in pysqlite versions
These are from Wichert Akkerman <wichert@deephackmode.org>'s python-dhm
http://www.wiggy.net/code/python-dhm
"""
try:
import sqlite3 as sqlite
except ImportError:
import sqlite
class TokenizeError(Exception):
"""Tokenizer error class"""
pass
def Tokenize(str, whitespace=" \t\r\n", quotes="\"", escapes="\\"):
"""String tokenizer
This function tokenizes a string while taking quotation and
escaping into account.
>>> import dhm.strtools
>>> dhm.strtools.Tokenize("this is a test")
['this', 'is', 'a', 'test']
>>> dhm.strtools.Tokenize("this \"is a\" test")
['this', 'is a', 'test']
>>> dhm.strtools.Tokenize("this \\\"is\\\" a test")
['this', '"is"', 'a', 'test']
>>> dhm.strtools.Tokenize("this \"is a test")
Traceback (most recent call last):
File "<stdin>", line 1, in ?
File "/usr/local/lib/python2.2/site-packages/dhm/strtools.py", line 80, in Tokenize
raise TokenizeError, "Unexpected end of string in quoted text"
dhm.strtools.TokenizeError: Unexecpted end of string in quoted text
@param str: string to tokenize
@type str: string
@param whitespace: whitespace characters seperating tokens
@type whitespace: string
@param quotes: legal quoting characters
@type quotes: string
@param escapes: characters which can escape quoting characters
@type escapes: string
@return: list of tokens
@rtype: sequence of strings
"""
(buffer, tokens, curtoken, quote)=(str, [], None, None)
try:
while buffer:
if buffer[0]==quote:
quote=None
elif (quote==None) and (buffer[0] in quotes):
quote=buffer[0]
elif buffer[0] in whitespace:
if quote!=None:
curtoken+=buffer[0]
else:
tokens.append(curtoken)
curtoken=None
while buffer[1] in whitespace:
buffer=buffer[1:]
elif buffer[0] in escapes:
if curtoken==None:
curtoken=buffer[1]
else:
curtoken+=buffer[1]
buffer=buffer[1:]
else:
if curtoken==None:
curtoken=buffer[0]
else:
curtoken+=buffer[0]
buffer=buffer[1:]
except IndexError:
raise TokenizeError, "Unexpected end of string"
if quote:
raise TokenizeError, "Unexpected end of string in quoted text"
if curtoken!=None:
tokens.append(curtoken)
return tokens
def QmarkToPyformat(query, params):
"""Convert from qmark to pyformat parameter style.
The python DB-API 2.0 specifies four different possible parameter
styles that can be used by drivers. This function converts from the
qmark style to pyformat style.
@param query: SQL query to transform
@type query: string
@param params: arguments to query
@type params: sequence of strings
@return: converted query and parameters
@rtype: tuple with the new command and a dictionary of arguments
"""
tokens=Tokenize(query, quotes="'")
output=[]
count=1
for token in tokens:
if token.endswith("?"):
output.append(token[:-1] + "%%(param%d)s" % count)
count+=1
elif token.endswith("?,") or token.endswith("?)"):
ntoken = token[:-2] + "%%(param%d)s" % count
ntoken += token[-1]
output.append(ntoken)
count+=1
else:
output.append(token)
dict={}
count=1
for param in params:
dict["param%d" % count]=param
count+=1
return (" ".join(output), dict)
def executeSQLPyFormat(cursor, query, params=None):
"""
Execute a python < 2.5 (external sqlite module) style query.
@param cursor: A sqlite cursor
@param query: The query to execute
@param params: An optional list of parameters to the query
"""
if params is None:
return cursor.execute(query)
# Leading whitespace confuses QmarkToPyformat()
query = query.strip()
(q, p) = QmarkToPyformat(query, params)
return cursor.execute(q, p)
def executeSQLQmark(cursor, query, params=None):
"""
Execute a python 2.5 (sqlite3) style query.
@param cursor: A sqlite cursor
@param query: The query to execute
@param params: An optional list of parameters to the query
"""
if params is None:
return cursor.execute(query)
return cursor.execute(query, params)
if sqlite.version_info[0] > 1:
executeSQL = executeSQLQmark
else:
executeSQL = executeSQLPyFormat
def sql_esc(pattern):
""" Apply SQLite escaping, if needed. Returns pattern and esc. """
esc = ''
if "_" in pattern or "%" in pattern:
esc = ' ESCAPE "!"'
pattern = pattern.replace("!", "!!")
pattern = pattern.replace("%", "!%")
pattern = pattern.replace("_", "!_")
return (pattern, esc)
def sql_esc_glob(patterns):
""" Converts patterns to SQL LIKE format, if required (or gives up if
not possible). """
ret = []
for pattern in patterns:
if '[' in pattern: # LIKE only has % and _, so [abc] can't be done.
return [] # So Load everything
# Convert to SQL LIKE format
(pattern, esc) = sql_esc(pattern)
pattern = pattern.replace("*", "%")
pattern = pattern.replace("?", "_")
ret.append((pattern, esc))
return ret
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