# revsetlang.py - parser, tokenizer and utility for revision set language
#
# Copyright 2010 Matt Mackall <mpm@selenic.com>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
from __future__ import absolute_import
import string
from .i18n import _
from . import (
error,
node,
parser,
pycompat,
)
elements = {
# token-type: binding-strength, primary, prefix, infix, suffix
"(": (21, None, ("group", 1, ")"), ("func", 1, ")"), None),
"##": (20, None, None, ("_concat", 20), None),
"~": (18, None, None, ("ancestor", 18), None),
"^": (18, None, None, ("parent", 18), "parentpost"),
"-": (5, None, ("negate", 19), ("minus", 5), None),
"::": (17, None, ("dagrangepre", 17), ("dagrange", 17), "dagrangepost"),
"..": (17, None, ("dagrangepre", 17), ("dagrange", 17), "dagrangepost"),
":": (15, "rangeall", ("rangepre", 15), ("range", 15), "rangepost"),
"not": (10, None, ("not", 10), None, None),
"!": (10, None, ("not", 10), None, None),
"and": (5, None, None, ("and", 5), None),
"&": (5, None, None, ("and", 5), None),
"%": (5, None, None, ("only", 5), "onlypost"),
"or": (4, None, None, ("or", 4), None),
"|": (4, None, None, ("or", 4), None),
"+": (4, None, None, ("or", 4), None),
"=": (3, None, None, ("keyvalue", 3), None),
",": (2, None, None, ("list", 2), None),
")": (0, None, None, None, None),
"symbol": (0, "symbol", None, None, None),
"string": (0, "string", None, None, None),
"end": (0, None, None, None, None),
}
keywords = set(['and', 'or', 'not'])
_quoteletters = set(['"', "'"])
_simpleopletters = set(pycompat.iterbytestr("():=,-|&+!~^%"))
# default set of valid characters for the initial letter of symbols
_syminitletters = set(pycompat.iterbytestr(
string.ascii_letters.encode('ascii') +
string.digits.encode('ascii') +
'._@')) | set(map(pycompat.bytechr, xrange(128, 256)))
# default set of valid characters for non-initial letters of symbols
_symletters = _syminitletters | set(pycompat.iterbytestr('-/'))
def tokenize(program, lookup=None, syminitletters=None, symletters=None):
'''
Parse a revset statement into a stream of tokens
``syminitletters`` is the set of valid characters for the initial
letter of symbols.
By default, character ``c`` is recognized as valid for initial
letter of symbols, if ``c.isalnum() or c in '._@' or ord(c) > 127``.
``symletters`` is the set of valid characters for non-initial
letters of symbols.
By default, character ``c`` is recognized as valid for non-initial
letters of symbols, if ``c.isalnum() or c in '-._/@' or ord(c) > 127``.
Check that @ is a valid unquoted token character (issue3686):
>>> list(tokenize("@::"))
[('symbol', '@', 0), ('::', None, 1), ('end', None, 3)]
'''
program = pycompat.bytestr(program)
if syminitletters is None:
syminitletters = _syminitletters
if symletters is None:
symletters = _symletters
if program and lookup:
# attempt to parse old-style ranges first to deal with
# things like old-tag which contain query metacharacters
parts = program.split(':', 1)
if all(lookup(sym) for sym in parts if sym):
if parts[0]:
yield ('symbol', parts[0], 0)
if len(parts) > 1:
s = len(parts[0])
yield (':', None, s)
if parts[1]:
yield ('symbol', parts[1], s + 1)
yield ('end', None, len(program))
return
pos, l = 0, len(program)
while pos < l:
c = program[pos]
if c.isspace(): # skip inter-token whitespace
pass
elif c == ':' and program[pos:pos + 2] == '::': # look ahead carefully
yield ('::', None, pos)
pos += 1 # skip ahead
elif c == '.' and program[pos:pos + 2] == '..': # look ahead carefully
yield ('..', None, pos)
pos += 1 # skip ahead
elif c == '#' and program[pos:pos + 2] == '##': # look ahead carefully
yield ('##', None, pos)
pos += 1 # skip ahead
elif c in _simpleopletters: # handle simple operators
yield (c, None, pos)
elif (c in _quoteletters or c == 'r' and
program[pos:pos + 2] in ("r'", 'r"')): # handle quoted strings
if c == 'r':
pos += 1
c = program[pos]
decode = lambda x: x
else:
decode = parser.unescapestr
pos += 1
s = pos
while pos < l: # find closing quote
d = program[pos]
if d == '\\': # skip over escaped characters
pos += 2
continue
if d == c:
yield ('string', decode(program[s:pos]), s)
break
pos += 1
else:
raise error.ParseError(_("unterminated string"), s)
# gather up a symbol/keyword
elif c in syminitletters:
s = pos
pos += 1
while pos < l: # find end of symbol
d = program[pos]
if d not in symletters:
break
if d == '.' and program[pos - 1] == '.': # special case for ..
pos -= 1
break
pos += 1
sym = program[s:pos]
if sym in keywords: # operator keywords
yield (sym, None, s)
elif '-' in sym:
# some jerk gave us foo-bar-baz, try to check if it's a symbol
if lookup and lookup(sym):
# looks like a real symbol
yield ('symbol', sym, s)
else:
# looks like an expression
parts = sym.split('-')
for p in parts[:-1]:
if p: # possible consecutive -
yield ('symbol', p, s)
s += len(p)
yield ('-', None, pos)
s += 1
if parts[-1]: # possible trailing -
yield ('symbol', parts[-1], s)
else:
yield ('symbol', sym, s)
pos -= 1
else:
raise error.ParseError(_("syntax error in revset '%s'") %
program, pos)
pos += 1
yield ('end', None, pos)
# helpers
_notset = object()
def getsymbol(x):
if x and x[0] == 'symbol':
return x[1]
raise error.ParseError(_('not a symbol'))
def getstring(x, err):
if x and (x[0] == 'string' or x[0] == 'symbol'):
return x[1]
raise error.ParseError(err)
def getinteger(x, err, default=_notset):
if not x and default is not _notset:
return default
try:
return int(getstring(x, err))
except ValueError:
raise error.ParseError(err)
def getlist(x):
if not x:
return []
if x[0] == 'list':
return list(x[1:])
return [x]
def getrange(x, err):
if not x:
raise error.ParseError(err)
op = x[0]
if op == 'range':
return x[1], x[2]
elif op == 'rangepre':
return None, x[1]
elif op == 'rangepost':
return x[1], None
elif op == 'rangeall':
return None, None
raise error.ParseError(err)
def getargs(x, min, max, err):
l = getlist(x)
if len(l) < min or (max >= 0 and len(l) > max):
raise error.ParseError(err)
return l
def getargsdict(x, funcname, keys):
return parser.buildargsdict(getlist(x), funcname, parser.splitargspec(keys),
keyvaluenode='keyvalue', keynode='symbol')
# Constants for ordering requirement, used in _analyze():
#
# If 'define', any nested functions and operations can change the ordering of
# the entries in the set. If 'follow', any nested functions and operations
# should take the ordering specified by the first operand to the '&' operator.
#
# For instance,
#
# X & (Y | Z)
# ^ ^^^^^^^
# | follow
# define
#
# will be evaluated as 'or(y(x()), z(x()))', where 'x()' can change the order
# of the entries in the set, but 'y()', 'z()' and 'or()' shouldn't.
#
# 'any' means the order doesn't matter. For instance,
#
# X & !Y
# ^
# any
#
# 'y()' can either enforce its ordering requirement or take the ordering
# specified by 'x()' because 'not()' doesn't care the order.
#
# Transition of ordering requirement:
#
# 1. starts with 'define'
# 2. shifts to 'follow' by 'x & y'
# 3. changes back to 'define' on function call 'f(x)' or function-like
# operation 'x (f) y' because 'f' may have its own ordering requirement
# for 'x' and 'y' (e.g. 'first(x)')
#
anyorder = 'any' # don't care the order
defineorder = 'define' # should define the order
followorder = 'follow' # must follow the current order
# transition table for 'x & y', from the current expression 'x' to 'y'
_tofolloworder = {
anyorder: anyorder,
defineorder: followorder,
followorder: followorder,
}
def _matchonly(revs, bases):
"""
>>> f = lambda *args: _matchonly(*map(parse, args))
>>> f('ancestors(A)', 'not ancestors(B)')
('list', ('symbol', 'A'), ('symbol', 'B'))
"""
if (revs is not None
and revs[0] == 'func'
and getsymbol(revs[1]) == 'ancestors'
and bases is not None
and bases[0] == 'not'
and bases[1][0] == 'func'
and getsymbol(bases[1][1]) == 'ancestors'):
return ('list', revs[2], bases[1][2])
def _fixops(x):
"""Rewrite raw parsed tree to resolve ambiguous syntax which cannot be
handled well by our simple top-down parser"""
if not isinstance(x, tuple):
return x
op = x[0]
if op == 'parent':
# x^:y means (x^) : y, not x ^ (:y)
# x^: means (x^) :, not x ^ (:)
post = ('parentpost', x[1])
if x[2][0] == 'dagrangepre':
return _fixops(('dagrange', post, x[2][1]))
elif x[2][0] == 'rangepre':
return _fixops(('range', post, x[2][1]))
elif x[2][0] == 'rangeall':
return _fixops(('rangepost', post))
elif op == 'or':
# make number of arguments deterministic:
# x + y + z -> (or x y z) -> (or (list x y z))
return (op, _fixops(('list',) + x[1:]))
return (op,) + tuple(_fixops(y) for y in x[1:])
def _analyze(x, order):
if x is None:
return x
op = x[0]
if op == 'minus':
return _analyze(('and', x[1], ('not', x[2])), order)
elif op == 'only':
t = ('func', ('symbol', 'only'), ('list', x[1], x[2]))
return _analyze(t, order)
elif op == 'onlypost':
return _analyze(('func', ('symbol', 'only'), x[1]), order)
elif op == 'dagrangepre':
return _analyze(('func', ('symbol', 'ancestors'), x[1]), order)
elif op == 'dagrangepost':
return _analyze(('func', ('symbol', 'descendants'), x[1]), order)
elif op == 'negate':
s = getstring(x[1], _("can't negate that"))
return _analyze(('string', '-' + s), order)
elif op in ('string', 'symbol'):
return x
elif op == 'and':
ta = _analyze(x[1], order)
tb = _analyze(x[2], _tofolloworder[order])
return (op, ta, tb, order)
elif op == 'or':
return (op, _analyze(x[1], order), order)
elif op == 'not':
return (op, _analyze(x[1], anyorder), order)
elif op == 'rangeall':
return (op, None, order)
elif op in ('rangepre', 'rangepost', 'parentpost'):
return (op, _analyze(x[1], defineorder), order)
elif op == 'group':
return _analyze(x[1], order)
elif op in ('dagrange', 'range', 'parent', 'ancestor'):
ta = _analyze(x[1], defineorder)
tb = _analyze(x[2], defineorder)
return (op, ta, tb, order)
elif op == 'list':
return (op,) + tuple(_analyze(y, order) for y in x[1:])
elif op == 'keyvalue':
return (op, x[1], _analyze(x[2], order))
elif op == 'func':
f = getsymbol(x[1])
d = defineorder
if f == 'present':
# 'present(set)' is known to return the argument set with no
# modification, so forward the current order to its argument
d = order
return (op, x[1], _analyze(x[2], d), order)
raise ValueError('invalid operator %r' % op)
def analyze(x, order=defineorder):
"""Transform raw parsed tree to evaluatable tree which can be fed to
optimize() or getset()
All pseudo operations should be mapped to real operations or functions
defined in methods or symbols table respectively.
'order' specifies how the current expression 'x' is ordered (see the
constants defined above.)
"""
return _analyze(x, order)
def _optimize(x, small):
if x is None:
return 0, x
smallbonus = 1
if small:
smallbonus = .5
op = x[0]
if op in ('string', 'symbol'):
return smallbonus, x # single revisions are small
elif op == 'and':
wa, ta = _optimize(x[1], True)
wb, tb = _optimize(x[2], True)
order = x[3]
w = min(wa, wb)
# (::x and not ::y)/(not ::y and ::x) have a fast path
tm = _matchonly(ta, tb) or _matchonly(tb, ta)
if tm:
return w, ('func', ('symbol', 'only'), tm, order)
if tb is not None and tb[0] == 'not':
return wa, ('difference', ta, tb[1], order)
if wa > wb:
return w, (op, tb, ta, order)
return w, (op, ta, tb, order)
elif op == 'or':
# fast path for machine-generated expression, that is likely to have
# lots of trivial revisions: 'a + b + c()' to '_list(a b) + c()'
order = x[2]
ws, ts, ss = [], [], []
def flushss():
if not ss:
return
if len(ss) == 1:
w, t = ss[0]
else:
s = '\0'.join(t[1] for w, t in ss)
y = ('func', ('symbol', '_list'), ('string', s), order)
w, t = _optimize(y, False)
ws.append(w)
ts.append(t)
del ss[:]
for y in getlist(x[1]):
w, t = _optimize(y, False)
if t is not None and (t[0] == 'string' or t[0] == 'symbol'):
ss.append((w, t))
continue
flushss()
ws.append(w)
ts.append(t)
flushss()
if len(ts) == 1:
return ws[0], ts[0] # 'or' operation is fully optimized out
# we can't reorder trees by weight because it would change the order.
# ("sort(a + b)" == "sort(b + a)", but "a + b" != "b + a")
# ts = tuple(t for w, t in sorted(zip(ws, ts), key=lambda wt: wt[0]))
return max(ws), (op, ('list',) + tuple(ts), order)
elif op == 'not':
# Optimize not public() to _notpublic() because we have a fast version
if x[1][:3] == ('func', ('symbol', 'public'), None):
order = x[1][3]
newsym = ('func', ('symbol', '_notpublic'), None, order)
o = _optimize(newsym, not small)
return o[0], o[1]
else:
o = _optimize(x[1], not small)
order = x[2]
return o[0], (op, o[1], order)
elif op == 'rangeall':
return smallbonus, x
elif op in ('rangepre', 'rangepost', 'parentpost'):
o = _optimize(x[1], small)
order = x[2]
return o[0], (op, o[1], order)
elif op in ('dagrange', 'range', 'parent', 'ancestor'):
wa, ta = _optimize(x[1], small)
wb, tb = _optimize(x[2], small)
order = x[3]
return wa + wb, (op, ta, tb, order)
elif op == 'list':
ws, ts = zip(*(_optimize(y, small) for y in x[1:]))
return sum(ws), (op,) + ts
elif op == 'keyvalue':
w, t = _optimize(x[2], small)
return w, (op, x[1], t)
elif op == 'func':
f = getsymbol(x[1])
wa, ta = _optimize(x[2], small)
if f in ('author', 'branch', 'closed', 'date', 'desc', 'file', 'grep',
'keyword', 'outgoing', 'user', 'destination'):
w = 10 # slow
elif f in ('modifies', 'adds', 'removes'):
w = 30 # slower
elif f == "contains":
w = 100 # very slow
elif f == "ancestor":
w = 1 * smallbonus
elif f in ('reverse', 'limit', 'first', 'wdir', '_intlist'):
w = 0
elif f == "sort":
w = 10 # assume most sorts look at changelog
else:
w = 1
order = x[3]
return w + wa, (op, x[1], ta, order)
raise ValueError('invalid operator %r' % op)
def optimize(tree):
"""Optimize evaluatable tree
All pseudo operations should be transformed beforehand.
"""
_weight, newtree = _optimize(tree, small=True)
return newtree
# the set of valid characters for the initial letter of symbols in
# alias declarations and definitions
_aliassyminitletters = _syminitletters | set(pycompat.sysstr('$'))
def _parsewith(spec, lookup=None, syminitletters=None):
"""Generate a parse tree of given spec with given tokenizing options
>>> _parsewith('foo($1)', syminitletters=_aliassyminitletters)
('func', ('symbol', 'foo'), ('symbol', '$1'))
>>> _parsewith('$1')
Traceback (most recent call last):
...
ParseError: ("syntax error in revset '$1'", 0)
>>> _parsewith('foo bar')
Traceback (most recent call last):
...
ParseError: ('invalid token', 4)
"""
p = parser.parser(elements)
tree, pos = p.parse(tokenize(spec, lookup=lookup,
syminitletters=syminitletters))
if pos != len(spec):
raise error.ParseError(_('invalid token'), pos)
return _fixops(parser.simplifyinfixops(tree, ('list', 'or')))
class _aliasrules(parser.basealiasrules):
"""Parsing and expansion rule set of revset aliases"""
_section = _('revset alias')
@staticmethod
def _parse(spec):
"""Parse alias declaration/definition ``spec``
This allows symbol names to use also ``$`` as an initial letter
(for backward compatibility), and callers of this function should
examine whether ``$`` is used also for unexpected symbols or not.
"""
return _parsewith(spec, syminitletters=_aliassyminitletters)
@staticmethod
def _trygetfunc(tree):
if tree[0] == 'func' and tree[1][0] == 'symbol':
return tree[1][1], getlist(tree[2])
def expandaliases(ui, tree):
aliases = _aliasrules.buildmap(ui.configitems('revsetalias'))
tree = _aliasrules.expand(aliases, tree)
# warn about problematic (but not referred) aliases
for name, alias in sorted(aliases.iteritems()):
if alias.error and not alias.warned:
ui.warn(_('warning: %s\n') % (alias.error))
alias.warned = True
return tree
def foldconcat(tree):
"""Fold elements to be concatenated by `##`
"""
if not isinstance(tree, tuple) or tree[0] in ('string', 'symbol'):
return tree
if tree[0] == '_concat':
pending = [tree]
l = []
while pending:
e = pending.pop()
if e[0] == '_concat':
pending.extend(reversed(e[1:]))
elif e[0] in ('string', 'symbol'):
l.append(e[1])
else:
msg = _("\"##\" can't concatenate \"%s\" element") % (e[0])
raise error.ParseError(msg)
return ('string', ''.join(l))
else:
return tuple(foldconcat(t) for t in tree)
def parse(spec, lookup=None):
return _parsewith(spec, lookup=lookup)
def formatspec(expr, *args):
'''
This is a convenience function for using revsets internally, and
escapes arguments appropriately. Aliases are intentionally ignored
so that intended expression behavior isn't accidentally subverted.
Supported arguments:
%r = revset expression, parenthesized
%d = int(arg), no quoting
%s = string(arg), escaped and single-quoted
%b = arg.branch(), escaped and single-quoted
%n = hex(arg), single-quoted
%% = a literal '%'
Prefixing the type with 'l' specifies a parenthesized list of that type.
>>> formatspec('%r:: and %lr', '10 or 11', ("this()", "that()"))
'(10 or 11):: and ((this()) or (that()))'
>>> formatspec('%d:: and not %d::', 10, 20)
'10:: and not 20::'
>>> formatspec('%ld or %ld', [], [1])
"_list('') or 1"
>>> formatspec('keyword(%s)', 'foo\\xe9')
"keyword('foo\\\\xe9')"
>>> b = lambda: 'default'
>>> b.branch = b
>>> formatspec('branch(%b)', b)
"branch('default')"
>>> formatspec('root(%ls)', ['a', 'b', 'c', 'd'])
"root(_list('a\\x00b\\x00c\\x00d'))"
'''
def quote(s):
return repr(str(s))
def argtype(c, arg):
if c == 'd':
return str(int(arg))
elif c == 's':
return quote(arg)
elif c == 'r':
parse(arg) # make sure syntax errors are confined
return '(%s)' % arg
elif c == 'n':
return quote(node.hex(arg))
elif c == 'b':
return quote(arg.branch())
def listexp(s, t):
l = len(s)
if l == 0:
return "_list('')"
elif l == 1:
return argtype(t, s[0])
elif t == 'd':
return "_intlist('%s')" % "\0".join(str(int(a)) for a in s)
elif t == 's':
return "_list('%s')" % "\0".join(s)
elif t == 'n':
return "_hexlist('%s')" % "\0".join(node.hex(a) for a in s)
elif t == 'b':
return "_list('%s')" % "\0".join(a.branch() for a in s)
m = l // 2
return '(%s or %s)' % (listexp(s[:m], t), listexp(s[m:], t))
expr = pycompat.bytestr(expr)
ret = ''
pos = 0
arg = 0
while pos < len(expr):
c = expr[pos]
if c == '%':
pos += 1
d = expr[pos]
if d == '%':
ret += d
elif d in 'dsnbr':
ret += argtype(d, args[arg])
arg += 1
elif d == 'l':
# a list of some type
pos += 1
d = expr[pos]
ret += listexp(list(args[arg]), d)
arg += 1
else:
raise error.Abort(_('unexpected revspec format character %s')
% d)
else:
ret += c
pos += 1
return ret
def prettyformat(tree):
return parser.prettyformat(tree, ('string', 'symbol'))
def depth(tree):
if isinstance(tree, tuple):
return max(map(depth, tree)) + 1
else:
return 0
def funcsused(tree):
if not isinstance(tree, tuple) or tree[0] in ('string', 'symbol'):
return set()
else:
funcs = set()
for s in tree[1:]:
funcs |= funcsused(s)
if tree[0] == 'func':
funcs.add(tree[1][1])
return funcs