fileset: add encoding() predicate

mercurial/fileset.py

@@ -1,393 +1,416 b''
 # fileset.py - file set queries for mercurial
 #
 # Copyright 2010 Matt Mackall <[e-mail]>
 #
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2 or any later version.
 
 import parser, error, util, merge, re
 from i18n import _
 
 elements = {
     "(": (20, ("group", 1, ")"), ("func", 1, ")")),
     "-": (5, ("negate", 19), ("minus", 5)),
     "not": (10, ("not", 10)),
     "!": (10, ("not", 10)),
     "and": (5, None, ("and", 5)),
     "&": (5, None, ("and", 5)),
     "or": (4, None, ("or", 4)),
     "|": (4, None, ("or", 4)),
     "+": (4, None, ("or", 4)),
     ",": (2, None, ("list", 2)),
     ")": (0, None, None),
     "symbol": (0, ("symbol",), None),
     "string": (0, ("string",), None),
     "end": (0, None, None),
 }
 
 keywords = set(['and', 'or', 'not'])
 
 globchars = ".*{}[]?/\\"
 
 def tokenize(program):
     pos, l = 0, len(program)
     while pos < l:
         c = program[pos]
         if c.isspace(): # skip inter-token whitespace
             pass
         elif c in "(),-|&+!": # handle simple operators
             yield (c, None, pos)
         elif (c in '"\'' 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 = lambda x: x.decode('string-escape')
             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)
         elif c.isalnum() or c in globchars or ord(c) > 127:
             # gather up a symbol/keyword
             s = pos
             pos += 1
             while pos < l: # find end of symbol
                 d = program[pos]
                 if not (d.isalnum() or d in globchars or ord(d) > 127):
                     break
                 pos += 1
             sym = program[s:pos]
             if sym in keywords: # operator keywords
                 yield (sym, None, s)
             else:
                 yield ('symbol', sym, s)
             pos -= 1
         else:
             raise error.ParseError(_("syntax error"), pos)
         pos += 1
     yield ('end', None, pos)
 
 parse = parser.parser(tokenize, elements).parse
 
 def getstring(x, err):
     if x and (x[0] == 'string' or x[0] == 'symbol'):
         return x[1]
     raise error.ParseError(err)
 
 def getset(mctx, x):
     if not x:
         raise error.ParseError(_("missing argument"))
     return methods[x[0]](mctx, *x[1:])
 
 def stringset(mctx, x):
     m = mctx.matcher([x])
     return [f for f in mctx.subset if m(f)]
 
 def andset(mctx, x, y):
     return getset(mctx.narrow(getset(mctx, x)), y)
 
 def orset(mctx, x, y):
     # needs optimizing
     xl = getset(mctx, x)
     yl = getset(mctx, y)
     return xl + [f for f in yl if f not in xl]
 
 def notset(mctx, x):
     s = set(getset(mctx, x))
     return [r for r in mctx.subset if r not in s]
 
 def listset(mctx, a, b):
     raise error.ParseError(_("can't use a list in this context"))
 
 def modified(mctx, x):
     """``modified()``
     File that is modified according to status.
     """
     getargs(x, 0, 0, _("modified takes no arguments"))
     s = mctx.status()[0]
     return [f for f in mctx.subset if f in s]
 
 def added(mctx, x):
     """``added()``
     File that is added according to status.
     """
     getargs(x, 0, 0, _("added takes no arguments"))
     s = mctx.status()[1]
     return [f for f in mctx.subset if f in s]
 
 def removed(mctx, x):
     """``removed()``
     File that is removed according to status.
     """
     getargs(x, 0, 0, _("removed takes no arguments"))
     s = mctx.status()[2]
     return [f for f in mctx.subset if f in s]
 
 def deleted(mctx, x):
     """``deleted()``
     File that is deleted according to status.
     """
     getargs(x, 0, 0, _("deleted takes no arguments"))
     s = mctx.status()[3]
     return [f for f in mctx.subset if f in s]
 
 def unknown(mctx, x):
     """``unknown()``
     File that is unknown according to status. These files will only be
     considered if this predicate is used.
     """
     getargs(x, 0, 0, _("unknown takes no arguments"))
     s = mctx.status()[4]
     return [f for f in mctx.subset if f in s]
 
 def ignored(mctx, x):
     """``ignored()``
     File that is ignored according to status. These files will only be
     considered if this predicate is used.
     """
     getargs(x, 0, 0, _("ignored takes no arguments"))
     s = mctx.status()[5]
     return [f for f in mctx.subset if f in s]
 
 def clean(mctx, x):
     """``clean()``
     File that is clean according to status.
     """
     getargs(x, 0, 0, _("clean takes no arguments"))
     s = mctx.status()[6]
     return [f for f in mctx.subset if f in s]
 
 def func(mctx, a, b):
     if a[0] == 'symbol' and a[1] in symbols:
         return symbols[a[1]](mctx, b)
     raise error.ParseError(_("not a function: %s") % a[1])
 
 def getlist(x):
     if not x:
         return []
     if x[0] == 'list':
         return getlist(x[1]) + [x[2]]
     return [x]
 
 def getargs(x, min, max, err):
     l = getlist(x)
     if len(l) < min or len(l) > max:
         raise error.ParseError(err)
     return l
 
 def binary(mctx, x):
     """``binary()``
     File that appears to be binary (contails NUL bytes).
     """
     getargs(x, 0, 0, _("binary takes no arguments"))
     return [f for f in mctx.subset if util.binary(mctx.ctx[f].data())]
 
 def exec_(mctx, x):
     """``exec()``
     File that is marked as executable.
     """
     getargs(x, 0, 0, _("exec takes no arguments"))
     return [f for f in mctx.subset if mctx.ctx.flags(f) == 'x']
 
 def symlink(mctx, x):
     """``symlink()``
     File that is marked as a symlink.
     """
     getargs(x, 0, 0, _("symlink takes no arguments"))
     return [f for f in mctx.subset if mctx.ctx.flags(f) == 'l']
 
 def resolved(mctx, x):
     """``resolved()``
     File that is marked resolved according to the resolve state.
     """
     getargs(x, 0, 0, _("resolved takes no arguments"))
     if mctx.ctx.rev() is not None:
         return []
     ms = merge.mergestate(mctx.ctx._repo)
     return [f for f in mctx.subset if f in ms and ms[f] == 'r']
 
 def unresolved(mctx, x):
     """``unresolved()``
     File that is marked unresolved according to the resolve state.
     """
     getargs(x, 0, 0, _("unresolved takes no arguments"))
     if mctx.ctx.rev() is not None:
         return []
     ms = merge.mergestate(mctx.ctx._repo)
     return [f for f in mctx.subset if f in ms and ms[f] == 'u']
 
 def hgignore(mctx, x):
     """``resolved()``
     File that matches the active .hgignore pattern.
     """
     getargs(x, 0, 0, _("hgignore takes no arguments"))
     ignore = mctx.ctx._repo.dirstate._ignore
     return [f for f in mctx.subset if ignore(f)]
 
 def grep(mctx, x):
     """``grep(regex)``
     File contains the given regular expression.
     """
     pat = getstring(x, _("grep requires a pattern"))
     r = re.compile(pat)
     return [f for f in mctx.subset if r.search(mctx.ctx[f].data())]
 
 _units = dict(k=2**10, K=2**10, kB=2**10, KB=2**10,
               M=2**20, MB=2**20, G=2**30, GB=2**30,
               kiB=10**3, MiB=10**6, GiB=10**9)
 
 def _sizetoint(s):
     try:
         s = s.strip()
         for k, v in _units.items():
             if s.endswith(k):
                 return int(float(s[:-len(k)]) * v)
         return int(s)
     except ValueError:
         raise
         raise error.ParseError(_("couldn't parse size"), s)
 
 def _sizetomax(s):
     try:
         s = s.strip()
         for k, v in _units.items():
             if s.endswith(k):
                 # max(4k) = 5k - 1, max(4.5k) = 4.6k - 1
                 n = s[:-len(k)]
                 inc = 1.0
                 if "." in n:
                     inc /= 10 ** len(n.split(".")[1])
                 return int((float(n) + inc) * v) - 1
         # no extension, this is a precise value
         return int(s)
     except ValueError:
         raise
         raise error.ParseError(_("couldn't parse size"), s)
 
 def size(mctx, x):
     """``size(expression)``
     File size matches the given expression. Examples:
 
     - 1k (files from 1024 to 2047 bytes)
     - 1.0kiB (files from 1000 to 1100 bytes)
     - < 20k (files less than 20480 bytes)
     - >= .5MiB (files at least 500000 bytes)
     - 4k - 1MB (files from 4096 bytes to 1048576 bytes)
     """
 
     expr = getstring(x, _("grep requires a pattern")).strip()
     if '-' in expr: # do we have a range?
         a, b = expr.split('-', 1)
         a = _sizetoint(a)
         b = _sizetoint(b)
         m = lambda x: x >= a and x <= b
     elif expr.startswith("<="):
         a = _sizetoint(expr[2:])
         m = lambda x: x <= a
     elif expr.startswith("<"):
         a = _sizetoint(expr[1:])
         m = lambda x: x < a
     elif expr.startswith(">="):
         a = _sizetoint(expr[2:])
         m = lambda x: x >= a
     elif expr.startswith(">"):
         a = _sizetoint(expr[1:])
         m = lambda x: x > a
     elif expr[0].isdigit or expr[0] == '.':
         a = _sizetoint(expr)
         b = _sizetomax(expr)
         m = lambda x: x >=a and x <= b
     else:
         raise error.ParseError(_("couldn't parse size"), expr)
 
     return [f for f in mctx.subset if m(mctx.ctx[f].size())]
 
+def encoding(mctx, x):
+    """``encoding(name)``
+    File can be successfully decoded with the given character
+    encoding. May not be useful for encodings other than ASCII and
+    UTF-8.
+    """
+
+    enc = getstring(x, _("encoding requires an encoding name"))
+
+    s = []
+    for f in mctx.subset:
+        d = mctx.ctx[f].data()
+        try:
+            d.decode(enc)
+        except LookupError:
+            raise util.Abort(_("unknown encoding '%s'") % enc)
+        except UnicodeDecodeError:
+            continue
+        s.append(f)
+
+    return s
+
 symbols = {
     'added': added,
     'binary': binary,
     'clean': clean,
     'deleted': deleted,
+    'encoding': encoding,
     'exec': exec_,
     'grep': grep,
     'ignored': ignored,
     'hgignore': hgignore,
     'modified': modified,
     'removed': removed,
     'resolved': resolved,
     'size': size,
     'symlink': symlink,
     'unknown': unknown,
     'unresolved': unresolved,
 }
 
 methods = {
     'string': stringset,
     'symbol': stringset,
     'and': andset,
     'or': orset,
     'list': listset,
     'group': getset,
     'not': notset,
     'func': func,
 }
 
 class matchctx(object):
     def __init__(self, ctx, subset=None, status=None):
         self.ctx = ctx
         self.subset = subset
         self._status = status
     def status(self):
         return self._status
     def matcher(self, patterns):
         return self.ctx.match(patterns)
     def filter(self, files):
         return [f for f in files if f in self.subset]
     def narrow(self, files):
         return matchctx(self.ctx, self.filter(files), self._status)
 
 def _intree(funcs, tree):
     if isinstance(tree, tuple):
         if tree[0] == 'func' and tree[1][0] == 'symbol':
             if tree[1][1] in funcs:
                 return True
         for s in tree[1:]:
             if _intree(funcs, s):
                 return True
     return False
 
 def getfileset(ctx, expr):
     tree, pos = parse(expr)
     if (pos != len(expr)):
         raise error.ParseError("invalid token", pos)
 
     # do we need status info?
     if _intree(['modified', 'added', 'removed', 'deleted',
                 'unknown', 'ignored', 'clean'], tree):
         unknown = _intree(['unknown'], tree)
         ignored = _intree(['ignored'], tree)
 
         r = ctx._repo
         status = r.status(ctx.p1(), ctx,
                           unknown=unknown, ignored=ignored, clean=True)
         subset = []
         for c in status:
             subset.extend(c)
     else:
         status = None
         subset = ctx.walk(ctx.match([]))
 
     return getset(matchctx(ctx, subset, status), tree)
 
 # tell hggettext to extract docstrings from these functions:
 i18nfunctions = symbols.values()