# fileset.py - file set queries for mercurial
#
# 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.

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.
    """
    # i18n: "modified" is a keyword
    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.
    """
    # i18n: "added" is a keyword
    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.
    """
    # i18n: "removed" is a keyword
    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.
    """
    # i18n: "deleted" is a keyword
    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.
    """
    # i18n: "unknown" is a keyword
    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.
    """
    # i18n: "ignored" is a keyword
    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.
    """
    # i18n: "clean" is a keyword
    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).
    """
    # i18n: "binary" is a keyword
    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.
    """
    # i18n: "exec" is a keyword
    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.
    """
    # i18n: "symlink" is a keyword
    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.
    """
    # i18n: "resolved" is a keyword
    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.
    """
    # i18n: "unresolved" is a keyword
    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):
    """``hgignore()``
    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)

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 error.ParseError(_("couldn't parse size: %s") % 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 error.ParseError(_("couldn't parse size: %s") % s)

def size(mctx, x):
    """``size(expression)``
    File size matches the given expression. Examples:

    - 1k (files from 1024 to 2047 bytes)
    - < 20k (files less than 20480 bytes)
    - >= .5MB (files at least 524288 bytes)
    - 4k - 1MB (files from 4096 bytes to 1048576 bytes)
    """

    # i18n: "size" is a keyword
    expr = getstring(x, _("size requires an expression")).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: %s") % 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.
    """

    # i18n: "encoding" is a keyword
    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

def copied(mctx, x):
    """``copied()``
    File that is recorded as being copied.
    """
    # i18n: "copied" is a keyword
    getargs(x, 0, 0, _("copied takes no arguments"))
    s = []
    for f in mctx.subset:
        p = mctx.ctx[f].parents()
        if p and p[0].path() != f:
            s.append(f)
    return s

symbols = {
    'added': added,
    'binary': binary,
    'clean': clean,
    'copied': copied,
    '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()
