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"""Various parsers for Postgres-specific data formats."""
import re
import skytools
__all__ = [
"parse_pgarray", "parse_logtriga_sql", "parse_tabbed_table",
"parse_statements", 'sql_tokenizer', 'parse_sqltriga_sql',
"parse_acl", "dedent", "hsize_to_bytes",
"parse_connect_string", "merge_connect_string"]
_rc_listelem = re.compile(r'( [^,"}]+ | ["] ( [^"\\]+ | [\\]. )* ["] )', re.X)
def parse_pgarray(array):
r"""Parse Postgres array and return list of items inside it.
Examples:
>>> parse_pgarray('{}')
[]
>>> parse_pgarray('{a,b,null,"null"}')
['a', 'b', None, 'null']
>>> parse_pgarray(r'{"a,a","b\"b","c\\c"}')
['a,a', 'b"b', 'c\\c']
>>> parse_pgarray("[0,3]={1,2,3}")
['1', '2', '3']
"""
if array is None:
return None
if not array or array[0] not in ("{", "[") or array[-1] != '}':
raise Exception("bad array format: must be surrounded with {}")
res = []
pos = 1
# skip optional dimensions descriptor "[a,b]={...}"
if array[0] == "[":
pos = array.find('{') + 1
if pos < 1:
raise Exception("bad array format: must be surrounded with {}")
while 1:
m = _rc_listelem.search(array, pos)
if not m:
break
pos2 = m.end()
item = array[pos:pos2]
if len(item) == 4 and item.upper() == "NULL":
val = None
else:
if len(item) > 0 and item[0] == '"':
if len(item) == 1 or item[-1] != '"':
raise Exception("bad array format: broken '\"'")
item = item[1:-1]
val = skytools.unescape(item)
res.append(val)
pos = pos2 + 1
if array[pos2] == "}":
break
elif array[pos2] != ",":
raise Exception("bad array format: expected ,} got " + repr(array[pos2]))
if pos < len(array) - 1:
raise Exception("bad array format: failed to parse completely (pos=%d len=%d)" % (pos, len(array)))
return res
#
# parse logtriga partial sql
#
class _logtriga_parser:
"""Parses logtriga/sqltriga partial SQL to values."""
def tokenizer(self, sql):
"""Token generator."""
for typ, tok in sql_tokenizer(sql, ignore_whitespace = True):
yield tok
def parse_insert(self, tk, fields, values, key_fields, key_values):
"""Handler for inserts."""
# (col1, col2) values ('data', null)
if tk.next() != "(":
raise Exception("syntax error")
while 1:
fields.append(tk.next())
t = tk.next()
if t == ")":
break
elif t != ",":
raise Exception("syntax error")
if tk.next().lower() != "values":
raise Exception("syntax error, expected VALUES")
if tk.next() != "(":
raise Exception("syntax error, expected (")
while 1:
values.append(tk.next())
t = tk.next()
if t == ")":
break
if t == ",":
continue
raise Exception("expected , or ) got "+t)
t = tk.next()
raise Exception("expected EOF, got " + repr(t))
def parse_update(self, tk, fields, values, key_fields, key_values):
"""Handler for updates."""
# col1 = 'data1', col2 = null where pk1 = 'pk1' and pk2 = 'pk2'
while 1:
fields.append(tk.next())
if tk.next() != "=":
raise Exception("syntax error")
values.append(tk.next())
t = tk.next()
if t == ",":
continue
elif t.lower() == "where":
break
else:
raise Exception("syntax error, expected WHERE or , got "+repr(t))
while 1:
fld = tk.next()
key_fields.append(fld)
self.pklist.append(fld)
if tk.next() != "=":
raise Exception("syntax error")
key_values.append(tk.next())
t = tk.next()
if t.lower() != "and":
raise Exception("syntax error, expected AND got "+repr(t))
def parse_delete(self, tk, fields, values, key_fields, key_values):
"""Handler for deletes."""
# pk1 = 'pk1' and pk2 = 'pk2'
while 1:
fld = tk.next()
key_fields.append(fld)
self.pklist.append(fld)
if tk.next() != "=":
raise Exception("syntax error")
key_values.append(tk.next())
t = tk.next()
if t.lower() != "and":
raise Exception("syntax error, expected AND, got "+repr(t))
def _create_dbdict(self, fields, values):
fields = [skytools.unquote_ident(f) for f in fields]
values = [skytools.unquote_literal(f) for f in values]
return skytools.dbdict(zip(fields, values))
def parse_sql(self, op, sql, pklist=None, splitkeys=False):
"""Main entry point."""
if pklist is None:
self.pklist = []
else:
self.pklist = pklist
tk = self.tokenizer(sql)
fields = []
values = []
key_fields = []
key_values = []
try:
if op == "I":
self.parse_insert(tk, fields, values, key_fields, key_values)
elif op == "U":
self.parse_update(tk, fields, values, key_fields, key_values)
elif op == "D":
self.parse_delete(tk, fields, values, key_fields, key_values)
raise Exception("syntax error")
except StopIteration:
# last sanity check
if (len(fields) + len(key_fields) == 0 or
len(fields) != len(values) or
len(key_fields) != len(key_values)):
raise Exception("syntax error, fields do not match values")
if splitkeys:
return (self._create_dbdict(key_fields, key_values),
self._create_dbdict(fields, values))
return self._create_dbdict(fields + key_fields, values + key_values)
def parse_logtriga_sql(op, sql, splitkeys=False):
return parse_sqltriga_sql(op, sql, splitkeys=splitkeys)
def parse_sqltriga_sql(op, sql, pklist=None, splitkeys=False):
"""Parse partial SQL used by pgq.sqltriga() back to data values.
Parser has following limitations:
- Expects standard_quoted_strings = off
- Does not support dollar quoting.
- Does not support complex expressions anywhere. (hashtext(col1) = hashtext(val1))
- WHERE expression must not contain IS (NOT) NULL
- Does not support updating pk value, unless you use the splitkeys parameter.
Returns dict of col->data pairs.
Insert event:
>>> parse_logtriga_sql('I', '(id, data) values (1, null)')
{'data': None, 'id': '1'}
Update event:
>>> parse_logtriga_sql('U', "data='foo' where id = 1")
{'data': 'foo', 'id': '1'}
Delete event:
>>> parse_logtriga_sql('D', "id = 1 and id2 = 'str''val'")
{'id2': "str'val", 'id': '1'}
If you set the splitkeys parameter, it will return two dicts, one for key
fields and one for data fields.
Insert event:
>>> parse_logtriga_sql('I', '(id, data) values (1, null)', splitkeys=True)
({}, {'data': None, 'id': '1'})
Update event:
>>> parse_logtriga_sql('U', "data='foo' where id = 1", splitkeys=True)
({'id': '1'}, {'data': 'foo'})
Delete event:
>>> parse_logtriga_sql('D', "id = 1 and id2 = 'str''val'", splitkeys=True)
({'id2': "str'val", 'id': '1'}, {})
"""
return _logtriga_parser().parse_sql(op, sql, pklist, splitkeys=splitkeys)
def parse_tabbed_table(txt):
r"""Parse a tab-separated table into list of dicts.
Expect first row to be column names.
Very primitive.
Example:
>>> parse_tabbed_table('col1\tcol2\nval1\tval2\n')
[{'col2': 'val2', 'col1': 'val1'}]
"""
txt = txt.replace("\r\n", "\n")
fields = None
data = []
for ln in txt.split("\n"):
if not ln:
continue
if not fields:
fields = ln.split("\t")
continue
cols = ln.split("\t")
if len(cols) != len(fields):
continue
row = dict(zip(fields, cols))
data.append(row)
return data
_extstr = r""" ['] (?: [^'\\]+ | \\. | [']['] )* ['] """
_stdstr = r""" ['] (?: [^']+ | [']['] )* ['] """
_name = r""" (?: [a-z_][a-z0-9_$]* | " (?: [^"]+ | "" )* " ) """
_ident = r""" (?P<ident> %s ) """ % _name
_fqident = r""" (?P<ident> %s (?: \. %s )* ) """ % (_name, _name)
_base_sql = r"""
(?P<dolq> (?P<dname> [$] (?: [_a-z][_a-z0-9]*)? [$] )
.*?
(?P=dname) )
| (?P<num> [0-9][0-9.e]* )
| (?P<numarg> [$] [0-9]+ )
| (?P<pyold> [%][(] [a-z_][a-z0-9_]* [)] [s] )
| (?P<pynew> [{] [^{}]+ [}] )
| (?P<ws> (?: \s+ | [/][*] .*? [*][/] | [-][-][^\n]* )+ )
| (?P<sym> (?: [-+*~!@#^&|?/%<>=]+ | [,()\[\].:;] ) )
| (?P<error> . )"""
_base_sql_fq = r"%s | %s" % (_fqident, _base_sql)
_base_sql = r"%s | %s" % (_ident, _base_sql)
_std_sql = r"""(?: (?P<str> [E] %s | %s ) | %s )""" % (_extstr, _stdstr, _base_sql)
_std_sql_fq = r"""(?: (?P<str> [E] %s | %s ) | %s )""" % (_extstr, _stdstr, _base_sql_fq)
_ext_sql = r"""(?: (?P<str> [E]? %s ) | %s )""" % (_extstr, _base_sql)
_ext_sql_fq = r"""(?: (?P<str> [E]? %s ) | %s )""" % (_extstr, _base_sql_fq)
_std_sql_rc = _ext_sql_rc = None
_std_sql_fq_rc = _ext_sql_fq_rc = None
def sql_tokenizer(sql, standard_quoting = False, ignore_whitespace = False,
fqident = False, show_location = False):
r"""Parser SQL to tokens.
Iterator, returns (toktype, tokstr) tuples.
Example
>>> [x for x in sql_tokenizer("select * from a.b", ignore_whitespace=True)]
[('ident', 'select'), ('sym', '*'), ('ident', 'from'), ('ident', 'a'), ('sym', '.'), ('ident', 'b')]
>>> [x for x in sql_tokenizer("\"c olumn\",'str''val'")]
[('ident', '"c olumn"'), ('sym', ','), ('str', "'str''val'")]
>>> list(sql_tokenizer('a.b a."b "" c" a.1', fqident=True, ignore_whitespace=True))
[('ident', 'a.b'), ('ident', 'a."b "" c"'), ('ident', 'a'), ('sym', '.'), ('num', '1')]
"""
global _std_sql_rc, _ext_sql_rc, _std_sql_fq_rc, _ext_sql_fq_rc
if not _std_sql_rc:
_std_sql_rc = re.compile(_std_sql, re.X | re.I | re.S)
_ext_sql_rc = re.compile(_ext_sql, re.X | re.I | re.S)
_std_sql_fq_rc = re.compile(_std_sql_fq, re.X | re.I | re.S)
_ext_sql_fq_rc = re.compile(_ext_sql_fq, re.X | re.I | re.S)
if standard_quoting:
if fqident:
rc = _std_sql_fq_rc
else:
rc = _std_sql_rc
else:
if fqident:
rc = _ext_sql_fq_rc
else:
rc = _ext_sql_rc
pos = 0
while 1:
m = rc.match(sql, pos)
if not m:
break
pos = m.end()
typ = m.lastgroup
if ignore_whitespace and typ == "ws":
continue
tk = m.group()
if show_location:
yield (typ, tk, pos)
else:
yield (typ, tk)
_copy_from_stdin_re = "copy.*from\s+stdin"
_copy_from_stdin_rc = None
def parse_statements(sql, standard_quoting = False):
"""Parse multi-statement string into separate statements.
Returns list of statements.
>>> [sql for sql in parse_statements("begin; select 1; select 'foo'; end;")]
['begin;', 'select 1;', "select 'foo';", 'end;']
"""
global _copy_from_stdin_rc
if not _copy_from_stdin_rc:
_copy_from_stdin_rc = re.compile(_copy_from_stdin_re, re.X | re.I)
tokens = []
pcount = 0 # '(' level
for typ, t in sql_tokenizer(sql, standard_quoting = standard_quoting):
# skip whitespace and comments before statement
if len(tokens) == 0 and typ == "ws":
continue
# keep the rest
tokens.append(t)
if t == "(":
pcount += 1
elif t == ")":
pcount -= 1
elif t == ";" and pcount == 0:
sql = "".join(tokens)
if _copy_from_stdin_rc.match(sql):
raise Exception("copy from stdin not supported")
yield ("".join(tokens))
tokens = []
if len(tokens) > 0:
yield ("".join(tokens))
if pcount != 0:
raise Exception("syntax error - unbalanced parenthesis")
_acl_name = r'(?: [0-9a-z_]+ | " (?: [^"]+ | "" )* " )'
_acl_re = r'''
\s* (?: group \s+ | user \s+ )?
(?P<tgt> %s )?
(?P<perm> = [a-z*]* )?
(?P<owner> / %s )?
\s* $
''' % (_acl_name, _acl_name)
_acl_rc = None
def parse_acl(acl):
"""Parse ACL entry.
>>> parse_acl('user=rwx/owner')
('user', 'rwx', 'owner')
>>> parse_acl('" ""user"=rwx/" ""owner"')
(' "user', 'rwx', ' "owner')
>>> parse_acl('user=rwx')
('user', 'rwx', None)
>>> parse_acl('=/f')
(None, '', 'f')
"""
global _acl_rc
if not _acl_rc:
_acl_rc = re.compile(_acl_re, re.I | re.X)
m = _acl_rc.match(acl)
if not m:
return None
target = m.group('tgt')
perm = m.group('perm')
owner = m.group('owner')
if target:
target = skytools.unquote_ident(target)
if perm:
perm = perm[1:]
if owner:
owner = skytools.unquote_ident(owner[1:])
return (target, perm, owner)
def dedent(doc):
r"""Relaxed dedent.
- takes whitespace to be removed from first indented line.
- allows empty or non-indented lines at the start
- allows first line to be unindented
- skips empty lines at the start
- ignores indent of empty lines
- if line does not match common indent, is stays unchanged
>>> dedent(' Line1:\n Line 2\n')
'Line1:\n Line 2\n'
>>> dedent(' \nLine1:\n Line 2\n Line 3\n Line 4')
'Line1:\nLine 2\n Line 3\n Line 4\n'
"""
pfx = None
res = []
for ln in doc.splitlines():
ln = ln.rstrip()
if not pfx and len(res) < 2:
if not ln:
continue
wslen = len(ln) - len(ln.lstrip())
pfx = ln[ : wslen]
if pfx:
if ln.startswith(pfx):
ln = ln[ len(pfx) : ]
res.append(ln)
res.append('')
return '\n'.join(res)
def hsize_to_bytes (input):
""" Convert sizes from human format to bytes (string to integer) """
assert isinstance (input, str)
m = re.match (r"^([0-9]+) *([KMGTPEZY]?)B?$", input.strip(), re.IGNORECASE)
if not m: raise ValueError ("cannot parse: %s" % input)
units = ['', 'K', 'M', 'G', 'T', 'P', 'E', 'Z', 'Y']
bytes = int(m.group(1)) * 1024 ** units.index(m.group(2).upper())
return bytes
#
# Connect string parsing
#
_cstr_rx = r""" \s* (\w+) \s* = \s* ( ' ( \\.| [^'\\] )* ' | \S+ ) \s* """
_cstr_unesc_rx = r"\\(.)"
_cstr_badval_rx = r"[\s'\\]"
_cstr_rc = None
_cstr_unesc_rc = None
_cstr_badval_rc = None
def parse_connect_string(cstr):
r"""Parse Postgres connect string.
>>> parse_connect_string("host=foo")
[('host', 'foo')]
>>> parse_connect_string(r" host = foo password = ' f\\\o\'o ' ")
[('host', 'foo'), ('password', "' f\\o'o '")]
"""
global _cstr_rc, _cstr_unesc_rc
if not _cstr_rc:
_cstr_rc = re.compile(_cstr_rx, re.X)
_cstr_unesc_rc = re.compile(_cstr_unesc_rx)
pos = 0
res = []
while pos < len(cstr):
m = _cstr_rc.match(cstr, pos)
if not m:
raise ValueError('Invalid connect string')
pos = m.end()
k = m.group(1)
v = m.group(2)
if v[0] == "'":
v = _cstr_unesc_rc.sub(r"\1", v)
res.append( (k,v) )
return res
def merge_connect_string(cstr_arg_list):
"""Put fragments back together.
>>> merge_connect_string([('host', 'ip'), ('pass', ''), ('x', ' ')])
"host=ip pass='' x=' '"
"""
global _cstr_badval_rc
if not _cstr_badval_rc:
_cstr_badval_rc = re.compile(_cstr_badval_rx)
buf = []
for k, v in cstr_arg_list:
if not v or _cstr_badval_rc.search(v):
v = v.replace('\\', r'\\')
v = v.replace("'", r"\'")
v = "'" + v + "'"
buf.append("%s=%s" % (k, v))
return ' '.join(buf)
if __name__ == '__main__':
import doctest
doctest.testmod()
|