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|
# quoting.py
"""Various helpers for string quoting/unquoting."""
import psycopg, urllib, re
#
# SQL quoting
#
def quote_literal(s):
"""Quote a literal value for SQL.
Surronds it with single-quotes.
"""
if s == None:
return "null"
s = psycopg.QuotedString(str(s))
return str(s)
def quote_copy(s):
"""Quoting for copy command."""
if s == None:
return "\\N"
s = str(s)
s = s.replace("\\", "\\\\")
s = s.replace("\t", "\\t")
s = s.replace("\n", "\\n")
s = s.replace("\r", "\\r")
return s
def quote_bytea_raw(s):
"""Quoting for bytea parser."""
if s == None:
return None
return s.replace("\\", "\\\\").replace("\0", "\\000")
def quote_bytea_literal(s):
"""Quote bytea for regular SQL."""
return quote_literal(quote_bytea_raw(s))
def quote_bytea_copy(s):
"""Quote bytea for COPY."""
return quote_copy(quote_bytea_raw(s))
def quote_statement(sql, dict):
"""Quote whose statement.
Data values are taken from dict.
"""
xdict = {}
for k, v in dict.items():
xdict[k] = quote_literal(v)
return sql % xdict
#
# quoting for JSON strings
#
_jsre = re.compile(r'[\x00-\x1F\\/"]')
_jsmap = { "\b": "\\b", "\f": "\\f", "\n": "\\n", "\r": "\\r",
"\t": "\\t", "\\": "\\\\", '"': '\\"',
"/": "\\/", # to avoid html attacks
}
def _json_quote_char(m):
c = m.group(0)
try:
return _jsmap[c]
except KeyError:
return r"\u%04x" % ord(c)
def quote_json(s):
"""JSON style quoting."""
if s is None:
return "null"
return '"%s"' % _jsre.sub(_json_quote_char, s)
#
# Database specific urlencode and urldecode.
#
def db_urlencode(dict):
"""Database specific urlencode.
Encode None as key without '='. That means that in "foo&bar=",
foo is NULL and bar is empty string.
"""
elem_list = []
for k, v in dict.items():
if v is None:
elem = urllib.quote_plus(str(k))
else:
elem = urllib.quote_plus(str(k)) + '=' + urllib.quote_plus(str(v))
elem_list.append(elem)
return '&'.join(elem_list)
def db_urldecode(qs):
"""Database specific urldecode.
Decode key without '=' as None.
This also does not support one key several times.
"""
res = {}
for elem in qs.split('&'):
if not elem:
continue
pair = elem.split('=', 1)
name = urllib.unquote_plus(pair[0])
if len(pair) == 1:
res[name] = None
else:
res[name] = urllib.unquote_plus(pair[1])
return res
#
# Remove C-like backslash escapes
#
_esc_re = r"\\([0-7][0-7][0-7]|.)"
_esc_rc = re.compile(_esc_re)
_esc_map = {
't': '\t',
'n': '\n',
'r': '\r',
'a': '\a',
'b': '\b',
"'": "'",
'"': '"',
'\\': '\\',
}
def _sub_unescape(m):
v = m.group(1)
if len(v) == 1:
return _esc_map[v]
else:
return chr(int(v, 8))
def unescape(val):
"""Removes C-style escapes from string."""
return _esc_rc.sub(_sub_unescape, val)
def unescape_copy(val):
"""Removes C-style escapes, also converts "\N" to None."""
if val == r"\N":
return None
return unescape(val)
|
