templater: extract template evaluation utility to new module

Prepares for splitting template functions to new module.

All eval* functions were moved to templateutil.py, and run* functions had to
be moved as well due to the dependency from eval*s. eval*s were aliased as
they are commonly used in codebase. _getdictitem() had to be made public.

mercurial/templater.py

@@ -9,7 +9,6 b' from __future__ import absolute_import, '
 
 import os
 import re
-import types
 
 from .i18n import _
 from . import (
@@ -27,15 +26,18 b' from . import ('
     scmutil,
     templatefilters,
     templatekw,
+    templateutil,
     util,
 )
 from .utils import dateutil
 
-class ResourceUnavailable(error.Abort):
-    pass
-
-class TemplateNotFound(error.Abort):
-    pass
+evalrawexp = templateutil.evalrawexp
+evalfuncarg = templateutil.evalfuncarg
+evalboolean = templateutil.evalboolean
+evalinteger = templateutil.evalinteger
+evalstring = templateutil.evalstring
+evalstringliteral = templateutil.evalstringliteral
+evalastype = templateutil.evalastype
 
 # template parsing
 
@@ -361,237 +363,43 b' def gettemplate(exp, context):'
         return context._load(exp[1])
     raise error.ParseError(_("expected template specifier"))
 
-def findsymbolicname(arg):
-    """Find symbolic name for the given compiled expression; returns None
-    if nothing found reliably"""
-    while True:
-        func, data = arg
-        if func is runsymbol:
-            return data
-        elif func is runfilter:
-            arg = data[0]
-        else:
-            return None
-
-def evalrawexp(context, mapping, arg):
-    """Evaluate given argument as a bare template object which may require
-    further processing (such as folding generator of strings)"""
-    func, data = arg
-    return func(context, mapping, data)
-
-def evalfuncarg(context, mapping, arg):
-    """Evaluate given argument as value type"""
-    thing = evalrawexp(context, mapping, arg)
-    thing = templatekw.unwrapvalue(thing)
-    # evalrawexp() may return string, generator of strings or arbitrary object
-    # such as date tuple, but filter does not want generator.
-    if isinstance(thing, types.GeneratorType):
-        thing = stringify(thing)
-    return thing
-
-def evalboolean(context, mapping, arg):
-    """Evaluate given argument as boolean, but also takes boolean literals"""
-    func, data = arg
-    if func is runsymbol:
-        thing = func(context, mapping, data, default=None)
-        if thing is None:
-            # not a template keyword, takes as a boolean literal
-            thing = util.parsebool(data)
-    else:
-        thing = func(context, mapping, data)
-    thing = templatekw.unwrapvalue(thing)
-    if isinstance(thing, bool):
-        return thing
-    # other objects are evaluated as strings, which means 0 is True, but
-    # empty dict/list should be False as they are expected to be ''
-    return bool(stringify(thing))
-
-def evalinteger(context, mapping, arg, err=None):
-    v = evalfuncarg(context, mapping, arg)
-    try:
-        return int(v)
-    except (TypeError, ValueError):
-        raise error.ParseError(err or _('not an integer'))
-
-def evalstring(context, mapping, arg):
-    return stringify(evalrawexp(context, mapping, arg))
-
-def evalstringliteral(context, mapping, arg):
-    """Evaluate given argument as string template, but returns symbol name
-    if it is unknown"""
-    func, data = arg
-    if func is runsymbol:
-        thing = func(context, mapping, data, default=data)
-    else:
-        thing = func(context, mapping, data)
-    return stringify(thing)
-
-_evalfuncbytype = {
-    bool: evalboolean,
-    bytes: evalstring,
-    int: evalinteger,
-}
-
-def evalastype(context, mapping, arg, typ):
-    """Evaluate given argument and coerce its type"""
-    try:
-        f = _evalfuncbytype[typ]
-    except KeyError:
-        raise error.ProgrammingError('invalid type specified: %r' % typ)
-    return f(context, mapping, arg)
-
-def runinteger(context, mapping, data):
-    return int(data)
-
-def runstring(context, mapping, data):
-    return data
-
-def _recursivesymbolblocker(key):
-    def showrecursion(**args):
-        raise error.Abort(_("recursive reference '%s' in template") % key)
-    return showrecursion
-
 def _runrecursivesymbol(context, mapping, key):
     raise error.Abort(_("recursive reference '%s' in template") % key)
 
-def runsymbol(context, mapping, key, default=''):
-    v = context.symbol(mapping, key)
-    if v is None:
-        # put poison to cut recursion. we can't move this to parsing phase
-        # because "x = {x}" is allowed if "x" is a keyword. (issue4758)
-        safemapping = mapping.copy()
-        safemapping[key] = _recursivesymbolblocker(key)
-        try:
-            v = context.process(key, safemapping)
-        except TemplateNotFound:
-            v = default
-    if callable(v) and getattr(v, '_requires', None) is None:
-        # old templatekw: expand all keywords and resources
-        props = context._resources.copy()
-        props.update(mapping)
-        return v(**pycompat.strkwargs(props))
-    if callable(v):
-        # new templatekw
-        try:
-            return v(context, mapping)
-        except ResourceUnavailable:
-            # unsupported keyword is mapped to empty just like unknown keyword
-            return None
-    return v
-
 def buildtemplate(exp, context):
     ctmpl = [compileexp(e, context, methods) for e in exp[1:]]
-    return (runtemplate, ctmpl)
-
-def runtemplate(context, mapping, template):
-    for arg in template:
-        yield evalrawexp(context, mapping, arg)
+    return (templateutil.runtemplate, ctmpl)
 
 def buildfilter(exp, context):
     n = getsymbol(exp[2])
     if n in context._filters:
         filt = context._filters[n]
         arg = compileexp(exp[1], context, methods)
-        return (runfilter, (arg, filt))
+        return (templateutil.runfilter, (arg, filt))
     if n in context._funcs:
         f = context._funcs[n]
         args = _buildfuncargs(exp[1], context, methods, n, f._argspec)
         return (f, args)
     raise error.ParseError(_("unknown function '%s'") % n)
 
-def runfilter(context, mapping, data):
-    arg, filt = data
-    thing = evalfuncarg(context, mapping, arg)
-    try:
-        return filt(thing)
-    except (ValueError, AttributeError, TypeError):
-        sym = findsymbolicname(arg)
-        if sym:
-            msg = (_("template filter '%s' is not compatible with keyword '%s'")
-                   % (pycompat.sysbytes(filt.__name__), sym))
-        else:
-            msg = (_("incompatible use of template filter '%s'")
-                   % pycompat.sysbytes(filt.__name__))
-        raise error.Abort(msg)
-
 def buildmap(exp, context):
     darg = compileexp(exp[1], context, methods)
     targ = gettemplate(exp[2], context)
-    return (runmap, (darg, targ))
-
-def runmap(context, mapping, data):
-    darg, targ = data
-    d = evalrawexp(context, mapping, darg)
-    if util.safehasattr(d, 'itermaps'):
-        diter = d.itermaps()
-    else:
-        try:
-            diter = iter(d)
-        except TypeError:
-            sym = findsymbolicname(darg)
-            if sym:
-                raise error.ParseError(_("keyword '%s' is not iterable") % sym)
-            else:
-                raise error.ParseError(_("%r is not iterable") % d)
-
-    for i, v in enumerate(diter):
-        lm = mapping.copy()
-        lm['index'] = i
-        if isinstance(v, dict):
-            lm.update(v)
-            lm['originalnode'] = mapping.get('node')
-            yield evalrawexp(context, lm, targ)
-        else:
-            # v is not an iterable of dicts, this happen when 'key'
-            # has been fully expanded already and format is useless.
-            # If so, return the expanded value.
-            yield v
+    return (templateutil.runmap, (darg, targ))
 
 def buildmember(exp, context):
     darg = compileexp(exp[1], context, methods)
     memb = getsymbol(exp[2])
-    return (runmember, (darg, memb))
-
-def runmember(context, mapping, data):
-    darg, memb = data
-    d = evalrawexp(context, mapping, darg)
-    if util.safehasattr(d, 'tomap'):
-        lm = mapping.copy()
-        lm.update(d.tomap())
-        return runsymbol(context, lm, memb)
-    if util.safehasattr(d, 'get'):
-        return _getdictitem(d, memb)
-
-    sym = findsymbolicname(darg)
-    if sym:
-        raise error.ParseError(_("keyword '%s' has no member") % sym)
-    else:
-        raise error.ParseError(_("%r has no member") % pycompat.bytestr(d))
+    return (templateutil.runmember, (darg, memb))
 
 def buildnegate(exp, context):
     arg = compileexp(exp[1], context, exprmethods)
-    return (runnegate, arg)
-
-def runnegate(context, mapping, data):
-    data = evalinteger(context, mapping, data,
-                       _('negation needs an integer argument'))
-    return -data
+    return (templateutil.runnegate, arg)
 
 def buildarithmetic(exp, context, func):
     left = compileexp(exp[1], context, exprmethods)
     right = compileexp(exp[2], context, exprmethods)
-    return (runarithmetic, (func, left, right))
-
-def runarithmetic(context, mapping, data):
-    func, left, right = data
-    left = evalinteger(context, mapping, left,
-                       _('arithmetic only defined on integers'))
-    right = evalinteger(context, mapping, right,
-                        _('arithmetic only defined on integers'))
-    try:
-        return func(left, right)
-    except ZeroDivisionError:
-        raise error.Abort(_('division by zero is not defined'))
+    return (templateutil.runarithmetic, (func, left, right))
 
 def buildfunc(exp, context):
     n = getsymbol(exp[1])
@@ -604,7 +412,7 b' def buildfunc(exp, context):'
         if len(args) != 1:
             raise error.ParseError(_("filter %s expects one argument") % n)
         f = context._filters[n]
-        return (runfilter, (args[0], f))
+        return (templateutil.runfilter, (args[0], f))
     raise error.ParseError(_("unknown function '%s'") % n)
 
 def _buildfuncargs(exp, context, curmethods, funcname, argspec):
@@ -681,7 +489,7 b' def dict_(context, mapping, args):'
     data = util.sortdict()
 
     for v in args['args']:
-        k = findsymbolicname(v)
+        k = templateutil.findsymbolicname(v)
         if not k:
             raise error.ParseError(_('dict key cannot be inferred'))
         if k in data or k in args['kwargs']:
@@ -848,13 +656,7 b' def get(context, mapping, args):'
         raise error.ParseError(_("get() expects a dict as first argument"))
 
     key = evalfuncarg(context, mapping, args[1])
-    return _getdictitem(dictarg, key)
-
-def _getdictitem(dictarg, key):
-    val = dictarg.get(key)
-    if val is None:
-        return
-    return templatekw.wraphybridvalue(dictarg, key, val)
+    return templateutil.getdictitem(dictarg, key)
 
 @templatefunc('if(expr, then[, else])')
 def if_(context, mapping, args):
@@ -1031,7 +833,8 b' def mod(context, mapping, args):'
         raise error.ParseError(_("mod expects two arguments"))
 
     func = lambda a, b: a % b
-    return runarithmetic(context, mapping, (func, args[0], args[1]))
+    return templateutil.runarithmetic(context, mapping,
+                                      (func, args[0], args[1]))
 
 @templatefunc('obsfateoperations(markers)')
 def obsfateoperations(context, mapping, args):
@@ -1273,9 +1076,9 b' def word(context, mapping, args):'
 
 # methods to interpret function arguments or inner expressions (e.g. {_(x)})
 exprmethods = {
-    "integer": lambda e, c: (runinteger, e[1]),
-    "string": lambda e, c: (runstring, e[1]),
-    "symbol": lambda e, c: (runsymbol, e[1]),
+    "integer": lambda e, c: (templateutil.runinteger, e[1]),
+    "string": lambda e, c: (templateutil.runstring, e[1]),
+    "symbol": lambda e, c: (templateutil.runsymbol, e[1]),
     "template": buildtemplate,
     "group": lambda e, c: compileexp(e[1], c, exprmethods),
     ".": buildmember,
@@ -1404,8 +1207,8 b' class engine(object):'
         if v is None:
             v = self._resources.get(key)
         if v is None:
-            raise ResourceUnavailable(_('template resource not available: %s')
-                                      % key)
+            raise templateutil.ResourceUnavailable(
+                _('template resource not available: %s') % key)
         return v
 
     def _load(self, t):
@@ -1552,8 +1355,8 b' class templater(object):'
             try:
                 self.cache[t] = util.readfile(self.map[t][1])
             except KeyError as inst:
-                raise TemplateNotFound(_('"%s" not in template map') %
-                                       inst.args[0])
+                raise templateutil.TemplateNotFound(
+                    _('"%s" not in template map') % inst.args[0])
             except IOError as inst:
                 reason = (_('template file %s: %s')
                           % (self.map[t][1], util.forcebytestr(inst.args[1])))

mercurial/templateutil.py

@@ -1,35 +1,22 b''
-# templater.py - template expansion for output
+# templateutil.py - utility for template evaluation
 #
 # Copyright 2005, 2006 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.
 
-from __future__ import absolute_import, print_function
+from __future__ import absolute_import
 
-import os
-import re
 import types
 
 from .i18n import _
 from . import (
-    color,
-    config,
-    encoding,
     error,
-    minirst,
-    obsutil,
-    parser,
     pycompat,
-    registrar,
-    revset as revsetmod,
-    revsetlang,
-    scmutil,
     templatefilters,
     templatekw,
     util,
 )
-from .utils import dateutil
 
 class ResourceUnavailable(error.Abort):
     pass
@@ -37,330 +24,6 b' class ResourceUnavailable(error.Abort):'
 class TemplateNotFound(error.Abort):
     pass
 
-# template parsing
-
-elements = {
-    # token-type: binding-strength, primary, prefix, infix, suffix
-    "(": (20, None, ("group", 1, ")"), ("func", 1, ")"), None),
-    ".": (18, None, None, (".", 18), None),
-    "%": (15, None, None, ("%", 15), None),
-    "|": (15, None, None, ("|", 15), None),
-    "*": (5, None, None, ("*", 5), None),
-    "/": (5, None, None, ("/", 5), None),
-    "+": (4, None, None, ("+", 4), None),
-    "-": (4, None, ("negate", 19), ("-", 4), None),
-    "=": (3, None, None, ("keyvalue", 3), None),
-    ",": (2, None, None, ("list", 2), None),
-    ")": (0, None, None, None, None),
-    "integer": (0, "integer", None, None, None),
-    "symbol": (0, "symbol", None, None, None),
-    "string": (0, "string", None, None, None),
-    "template": (0, "template", None, None, None),
-    "end": (0, None, None, None, None),
-}
-
-def tokenize(program, start, end, term=None):
-    """Parse a template expression into a stream of tokens, which must end
-    with term if specified"""
-    pos = start
-    program = pycompat.bytestr(program)
-    while pos < end:
-        c = program[pos]
-        if c.isspace(): # skip inter-token whitespace
-            pass
-        elif c in "(=,).%|+-*/": # handle simple operators
-            yield (c, None, pos)
-        elif c in '"\'': # handle quoted templates
-            s = pos + 1
-            data, pos = _parsetemplate(program, s, end, c)
-            yield ('template', data, s)
-            pos -= 1
-        elif c == 'r' and program[pos:pos + 2] in ("r'", 'r"'):
-            # handle quoted strings
-            c = program[pos + 1]
-            s = pos = pos + 2
-            while pos < end: # find closing quote
-                d = program[pos]
-                if d == '\\': # skip over escaped characters
-                    pos += 2
-                    continue
-                if d == c:
-                    yield ('string', program[s:pos], s)
-                    break
-                pos += 1
-            else:
-                raise error.ParseError(_("unterminated string"), s)
-        elif c.isdigit():
-            s = pos
-            while pos < end:
-                d = program[pos]
-                if not d.isdigit():
-                    break
-                pos += 1
-            yield ('integer', program[s:pos], s)
-            pos -= 1
-        elif (c == '\\' and program[pos:pos + 2] in (br"\'", br'\"')
-              or c == 'r' and program[pos:pos + 3] in (br"r\'", br'r\"')):
-            # handle escaped quoted strings for compatibility with 2.9.2-3.4,
-            # where some of nested templates were preprocessed as strings and
-            # then compiled. therefore, \"...\" was allowed. (issue4733)
-            #
-            # processing flow of _evalifliteral() at 5ab28a2e9962:
-            # outer template string    -> stringify()  -> compiletemplate()
-            # ------------------------    ------------    ------------------
-            # {f("\\\\ {g(\"\\\"\")}"}    \\ {g("\"")}    [r'\\', {g("\"")}]
-            #             ~~~~~~~~
-            #             escaped quoted string
-            if c == 'r':
-                pos += 1
-                token = 'string'
-            else:
-                token = 'template'
-            quote = program[pos:pos + 2]
-            s = pos = pos + 2
-            while pos < end: # find closing escaped quote
-                if program.startswith('\\\\\\', pos, end):
-                    pos += 4 # skip over double escaped characters
-                    continue
-                if program.startswith(quote, pos, end):
-                    # interpret as if it were a part of an outer string
-                    data = parser.unescapestr(program[s:pos])
-                    if token == 'template':
-                        data = _parsetemplate(data, 0, len(data))[0]
-                    yield (token, data, s)
-                    pos += 1
-                    break
-                pos += 1
-            else:
-                raise error.ParseError(_("unterminated string"), s)
-        elif c.isalnum() or c in '_':
-            s = pos
-            pos += 1
-            while pos < end: # find end of symbol
-                d = program[pos]
-                if not (d.isalnum() or d == "_"):
-                    break
-                pos += 1
-            sym = program[s:pos]
-            yield ('symbol', sym, s)
-            pos -= 1
-        elif c == term:
-            yield ('end', None, pos)
-            return
-        else:
-            raise error.ParseError(_("syntax error"), pos)
-        pos += 1
-    if term:
-        raise error.ParseError(_("unterminated template expansion"), start)
-    yield ('end', None, pos)
-
-def _parsetemplate(tmpl, start, stop, quote=''):
-    r"""
-    >>> _parsetemplate(b'foo{bar}"baz', 0, 12)
-    ([('string', 'foo'), ('symbol', 'bar'), ('string', '"baz')], 12)
-    >>> _parsetemplate(b'foo{bar}"baz', 0, 12, quote=b'"')
-    ([('string', 'foo'), ('symbol', 'bar')], 9)
-    >>> _parsetemplate(b'foo"{bar}', 0, 9, quote=b'"')
-    ([('string', 'foo')], 4)
-    >>> _parsetemplate(br'foo\"bar"baz', 0, 12, quote=b'"')
-    ([('string', 'foo"'), ('string', 'bar')], 9)
-    >>> _parsetemplate(br'foo\\"bar', 0, 10, quote=b'"')
-    ([('string', 'foo\\')], 6)
-    """
-    parsed = []
-    for typ, val, pos in _scantemplate(tmpl, start, stop, quote):
-        if typ == 'string':
-            parsed.append((typ, val))
-        elif typ == 'template':
-            parsed.append(val)
-        elif typ == 'end':
-            return parsed, pos
-        else:
-            raise error.ProgrammingError('unexpected type: %s' % typ)
-    raise error.ProgrammingError('unterminated scanning of template')
-
-def scantemplate(tmpl, raw=False):
-    r"""Scan (type, start, end) positions of outermost elements in template
-
-    If raw=True, a backslash is not taken as an escape character just like
-    r'' string in Python. Note that this is different from r'' literal in
-    template in that no template fragment can appear in r'', e.g. r'{foo}'
-    is a literal '{foo}', but ('{foo}', raw=True) is a template expression
-    'foo'.
-
-    >>> list(scantemplate(b'foo{bar}"baz'))
-    [('string', 0, 3), ('template', 3, 8), ('string', 8, 12)]
-    >>> list(scantemplate(b'outer{"inner"}outer'))
-    [('string', 0, 5), ('template', 5, 14), ('string', 14, 19)]
-    >>> list(scantemplate(b'foo\\{escaped}'))
-    [('string', 0, 5), ('string', 5, 13)]
-    >>> list(scantemplate(b'foo\\{escaped}', raw=True))
-    [('string', 0, 4), ('template', 4, 13)]
-    """
-    last = None
-    for typ, val, pos in _scantemplate(tmpl, 0, len(tmpl), raw=raw):
-        if last:
-            yield last + (pos,)
-        if typ == 'end':
-            return
-        else:
-            last = (typ, pos)
-    raise error.ProgrammingError('unterminated scanning of template')
-
-def _scantemplate(tmpl, start, stop, quote='', raw=False):
-    """Parse template string into chunks of strings and template expressions"""
-    sepchars = '{' + quote
-    unescape = [parser.unescapestr, pycompat.identity][raw]
-    pos = start
-    p = parser.parser(elements)
-    try:
-        while pos < stop:
-            n = min((tmpl.find(c, pos, stop) for c in sepchars),
-                    key=lambda n: (n < 0, n))
-            if n < 0:
-                yield ('string', unescape(tmpl[pos:stop]), pos)
-                pos = stop
-                break
-            c = tmpl[n:n + 1]
-            bs = 0  # count leading backslashes
-            if not raw:
-                bs = (n - pos) - len(tmpl[pos:n].rstrip('\\'))
-            if bs % 2 == 1:
-                # escaped (e.g. '\{', '\\\{', but not '\\{')
-                yield ('string', unescape(tmpl[pos:n - 1]) + c, pos)
-                pos = n + 1
-                continue
-            if n > pos:
-                yield ('string', unescape(tmpl[pos:n]), pos)
-            if c == quote:
-                yield ('end', None, n + 1)
-                return
-
-            parseres, pos = p.parse(tokenize(tmpl, n + 1, stop, '}'))
-            if not tmpl.startswith('}', pos):
-                raise error.ParseError(_("invalid token"), pos)
-            yield ('template', parseres, n)
-            pos += 1
-
-        if quote:
-            raise error.ParseError(_("unterminated string"), start)
-    except error.ParseError as inst:
-        if len(inst.args) > 1:  # has location
-            loc = inst.args[1]
-            # Offset the caret location by the number of newlines before the
-            # location of the error, since we will replace one-char newlines
-            # with the two-char literal r'\n'.
-            offset = tmpl[:loc].count('\n')
-            tmpl = tmpl.replace('\n', br'\n')
-            # We want the caret to point to the place in the template that
-            # failed to parse, but in a hint we get a open paren at the
-            # start. Therefore, we print "loc + 1" spaces (instead of "loc")
-            # to line up the caret with the location of the error.
-            inst.hint = (tmpl + '\n'
-                         + ' ' * (loc + 1 + offset) + '^ ' + _('here'))
-        raise
-    yield ('end', None, pos)
-
-def _unnesttemplatelist(tree):
-    """Expand list of templates to node tuple
-
-    >>> def f(tree):
-    ...     print(pycompat.sysstr(prettyformat(_unnesttemplatelist(tree))))
-    >>> f((b'template', []))
-    (string '')
-    >>> f((b'template', [(b'string', b'foo')]))
-    (string 'foo')
-    >>> f((b'template', [(b'string', b'foo'), (b'symbol', b'rev')]))
-    (template
-      (string 'foo')
-      (symbol 'rev'))
-    >>> f((b'template', [(b'symbol', b'rev')]))  # template(rev) -> str
-    (template
-      (symbol 'rev'))
-    >>> f((b'template', [(b'template', [(b'string', b'foo')])]))
-    (string 'foo')
-    """
-    if not isinstance(tree, tuple):
-        return tree
-    op = tree[0]
-    if op != 'template':
-        return (op,) + tuple(_unnesttemplatelist(x) for x in tree[1:])
-
-    assert len(tree) == 2
-    xs = tuple(_unnesttemplatelist(x) for x in tree[1])
-    if not xs:
-        return ('string', '')  # empty template ""
-    elif len(xs) == 1 and xs[0][0] == 'string':
-        return xs[0]  # fast path for string with no template fragment "x"
-    else:
-        return (op,) + xs
-
-def parse(tmpl):
-    """Parse template string into tree"""
-    parsed, pos = _parsetemplate(tmpl, 0, len(tmpl))
-    assert pos == len(tmpl), 'unquoted template should be consumed'
-    return _unnesttemplatelist(('template', parsed))
-
-def _parseexpr(expr):
-    """Parse a template expression into tree
-
-    >>> _parseexpr(b'"foo"')
-    ('string', 'foo')
-    >>> _parseexpr(b'foo(bar)')
-    ('func', ('symbol', 'foo'), ('symbol', 'bar'))
-    >>> _parseexpr(b'foo(')
-    Traceback (most recent call last):
-      ...
-    ParseError: ('not a prefix: end', 4)
-    >>> _parseexpr(b'"foo" "bar"')
-    Traceback (most recent call last):
-      ...
-    ParseError: ('invalid token', 7)
-    """
-    p = parser.parser(elements)
-    tree, pos = p.parse(tokenize(expr, 0, len(expr)))
-    if pos != len(expr):
-        raise error.ParseError(_('invalid token'), pos)
-    return _unnesttemplatelist(tree)
-
-def prettyformat(tree):
-    return parser.prettyformat(tree, ('integer', 'string', 'symbol'))
-
-def compileexp(exp, context, curmethods):
-    """Compile parsed template tree to (func, data) pair"""
-    if not exp:
-        raise error.ParseError(_("missing argument"))
-    t = exp[0]
-    if t in curmethods:
-        return curmethods[t](exp, context)
-    raise error.ParseError(_("unknown method '%s'") % t)
-
-# template evaluation
-
-def getsymbol(exp):
-    if exp[0] == 'symbol':
-        return exp[1]
-    raise error.ParseError(_("expected a symbol, got '%s'") % exp[0])
-
-def getlist(x):
-    if not x:
-        return []
-    if x[0] == 'list':
-        return getlist(x[1]) + [x[2]]
-    return [x]
-
-def gettemplate(exp, context):
-    """Compile given template tree or load named template from map file;
-    returns (func, data) pair"""
-    if exp[0] in ('template', 'string'):
-        return compileexp(exp, context, methods)
-    if exp[0] == 'symbol':
-        # unlike runsymbol(), here 'symbol' is always taken as template name
-        # even if it exists in mapping. this allows us to override mapping
-        # by web templates, e.g. 'changelogtag' is redefined in map file.
-        return context._load(exp[1])
-    raise error.ParseError(_("expected template specifier"))
-
 def findsymbolicname(arg):
     """Find symbolic name for the given compiled expression; returns None
     if nothing found reliably"""
@@ -451,9 +114,6 b' def _recursivesymbolblocker(key):'
         raise error.Abort(_("recursive reference '%s' in template") % key)
     return showrecursion
 
-def _runrecursivesymbol(context, mapping, key):
-    raise error.Abort(_("recursive reference '%s' in template") % key)
-
 def runsymbol(context, mapping, key, default=''):
     v = context.symbol(mapping, key)
     if v is None:
@@ -479,26 +139,10 b' def runsymbol(context, mapping, key, def'
             return None
     return v
 
-def buildtemplate(exp, context):
-    ctmpl = [compileexp(e, context, methods) for e in exp[1:]]
-    return (runtemplate, ctmpl)
-
 def runtemplate(context, mapping, template):
     for arg in template:
         yield evalrawexp(context, mapping, arg)
 
-def buildfilter(exp, context):
-    n = getsymbol(exp[2])
-    if n in context._filters:
-        filt = context._filters[n]
-        arg = compileexp(exp[1], context, methods)
-        return (runfilter, (arg, filt))
-    if n in context._funcs:
-        f = context._funcs[n]
-        args = _buildfuncargs(exp[1], context, methods, n, f._argspec)
-        return (f, args)
-    raise error.ParseError(_("unknown function '%s'") % n)
-
 def runfilter(context, mapping, data):
     arg, filt = data
     thing = evalfuncarg(context, mapping, arg)
@@ -514,11 +158,6 b' def runfilter(context, mapping, data):'
                    % pycompat.sysbytes(filt.__name__))
         raise error.Abort(msg)
 
-def buildmap(exp, context):
-    darg = compileexp(exp[1], context, methods)
-    targ = gettemplate(exp[2], context)
-    return (runmap, (darg, targ))
-
 def runmap(context, mapping, data):
     darg, targ = data
     d = evalrawexp(context, mapping, darg)
@@ -547,11 +186,6 b' def runmap(context, mapping, data):'
             # If so, return the expanded value.
             yield v
 
-def buildmember(exp, context):
-    darg = compileexp(exp[1], context, methods)
-    memb = getsymbol(exp[2])
-    return (runmember, (darg, memb))
-
 def runmember(context, mapping, data):
     darg, memb = data
     d = evalrawexp(context, mapping, darg)
@@ -560,7 +194,7 b' def runmember(context, mapping, data):'
         lm.update(d.tomap())
         return runsymbol(context, lm, memb)
     if util.safehasattr(d, 'get'):
-        return _getdictitem(d, memb)
+        return getdictitem(d, memb)
 
     sym = findsymbolicname(darg)
     if sym:
@@ -568,20 +202,11 b' def runmember(context, mapping, data):'
     else:
         raise error.ParseError(_("%r has no member") % pycompat.bytestr(d))
 
-def buildnegate(exp, context):
-    arg = compileexp(exp[1], context, exprmethods)
-    return (runnegate, arg)
-
 def runnegate(context, mapping, data):
     data = evalinteger(context, mapping, data,
                        _('negation needs an integer argument'))
     return -data
 
-def buildarithmetic(exp, context, func):
-    left = compileexp(exp[1], context, exprmethods)
-    right = compileexp(exp[2], context, exprmethods)
-    return (runarithmetic, (func, left, right))
-
 def runarithmetic(context, mapping, data):
     func, left, right = data
     left = evalinteger(context, mapping, left,
@@ -593,1051 +218,10 b' def runarithmetic(context, mapping, data'
     except ZeroDivisionError:
         raise error.Abort(_('division by zero is not defined'))
 
-def buildfunc(exp, context):
-    n = getsymbol(exp[1])
-    if n in context._funcs:
-        f = context._funcs[n]
-        args = _buildfuncargs(exp[2], context, exprmethods, n, f._argspec)
-        return (f, args)
-    if n in context._filters:
-        args = _buildfuncargs(exp[2], context, exprmethods, n, argspec=None)
-        if len(args) != 1:
-            raise error.ParseError(_("filter %s expects one argument") % n)
-        f = context._filters[n]
-        return (runfilter, (args[0], f))
-    raise error.ParseError(_("unknown function '%s'") % n)
-
-def _buildfuncargs(exp, context, curmethods, funcname, argspec):
-    """Compile parsed tree of function arguments into list or dict of
-    (func, data) pairs
-
-    >>> context = engine(lambda t: (runsymbol, t))
-    >>> def fargs(expr, argspec):
-    ...     x = _parseexpr(expr)
-    ...     n = getsymbol(x[1])
-    ...     return _buildfuncargs(x[2], context, exprmethods, n, argspec)
-    >>> list(fargs(b'a(l=1, k=2)', b'k l m').keys())
-    ['l', 'k']
-    >>> args = fargs(b'a(opts=1, k=2)', b'**opts')
-    >>> list(args.keys()), list(args[b'opts'].keys())
-    (['opts'], ['opts', 'k'])
-    """
-    def compiledict(xs):
-        return util.sortdict((k, compileexp(x, context, curmethods))
-                             for k, x in xs.iteritems())
-    def compilelist(xs):
-        return [compileexp(x, context, curmethods) for x in xs]
-
-    if not argspec:
-        # filter or function with no argspec: return list of positional args
-        return compilelist(getlist(exp))
-
-    # function with argspec: return dict of named args
-    _poskeys, varkey, _keys, optkey = argspec = parser.splitargspec(argspec)
-    treeargs = parser.buildargsdict(getlist(exp), funcname, argspec,
-                                    keyvaluenode='keyvalue', keynode='symbol')
-    compargs = util.sortdict()
-    if varkey:
-        compargs[varkey] = compilelist(treeargs.pop(varkey))
-    if optkey:
-        compargs[optkey] = compiledict(treeargs.pop(optkey))
-    compargs.update(compiledict(treeargs))
-    return compargs
-
-def buildkeyvaluepair(exp, content):
-    raise error.ParseError(_("can't use a key-value pair in this context"))
-
-# dict of template built-in functions
-funcs = {}
-
-templatefunc = registrar.templatefunc(funcs)
-
-@templatefunc('date(date[, fmt])')
-def date(context, mapping, args):
-    """Format a date. See :hg:`help dates` for formatting
-    strings. The default is a Unix date format, including the timezone:
-    "Mon Sep 04 15:13:13 2006 0700"."""
-    if not (1 <= len(args) <= 2):
-        # i18n: "date" is a keyword
-        raise error.ParseError(_("date expects one or two arguments"))
-
-    date = evalfuncarg(context, mapping, args[0])
-    fmt = None
-    if len(args) == 2:
-        fmt = evalstring(context, mapping, args[1])
-    try:
-        if fmt is None:
-            return dateutil.datestr(date)
-        else:
-            return dateutil.datestr(date, fmt)
-    except (TypeError, ValueError):
-        # i18n: "date" is a keyword
-        raise error.ParseError(_("date expects a date information"))
-
-@templatefunc('dict([[key=]value...])', argspec='*args **kwargs')
-def dict_(context, mapping, args):
-    """Construct a dict from key-value pairs. A key may be omitted if
-    a value expression can provide an unambiguous name."""
-    data = util.sortdict()
-
-    for v in args['args']:
-        k = findsymbolicname(v)
-        if not k:
-            raise error.ParseError(_('dict key cannot be inferred'))
-        if k in data or k in args['kwargs']:
-            raise error.ParseError(_("duplicated dict key '%s' inferred") % k)
-        data[k] = evalfuncarg(context, mapping, v)
-
-    data.update((k, evalfuncarg(context, mapping, v))
-                for k, v in args['kwargs'].iteritems())
-    return templatekw.hybriddict(data)
-
-@templatefunc('diff([includepattern [, excludepattern]])')
-def diff(context, mapping, args):
-    """Show a diff, optionally
-    specifying files to include or exclude."""
-    if len(args) > 2:
-        # i18n: "diff" is a keyword
-        raise error.ParseError(_("diff expects zero, one, or two arguments"))
-
-    def getpatterns(i):
-        if i < len(args):
-            s = evalstring(context, mapping, args[i]).strip()
-            if s:
-                return [s]
-        return []
-
-    ctx = context.resource(mapping, 'ctx')
-    chunks = ctx.diff(match=ctx.match([], getpatterns(0), getpatterns(1)))
-
-    return ''.join(chunks)
-
-@templatefunc('extdata(source)', argspec='source')
-def extdata(context, mapping, args):
-    """Show a text read from the specified extdata source. (EXPERIMENTAL)"""
-    if 'source' not in args:
-        # i18n: "extdata" is a keyword
-        raise error.ParseError(_('extdata expects one argument'))
-
-    source = evalstring(context, mapping, args['source'])
-    cache = context.resource(mapping, 'cache').setdefault('extdata', {})
-    ctx = context.resource(mapping, 'ctx')
-    if source in cache:
-        data = cache[source]
-    else:
-        data = cache[source] = scmutil.extdatasource(ctx.repo(), source)
-    return data.get(ctx.rev(), '')
-
-@templatefunc('files(pattern)')
-def files(context, mapping, args):
-    """All files of the current changeset matching the pattern. See
-    :hg:`help patterns`."""
-    if not len(args) == 1:
-        # i18n: "files" is a keyword
-        raise error.ParseError(_("files expects one argument"))
-
-    raw = evalstring(context, mapping, args[0])
-    ctx = context.resource(mapping, 'ctx')
-    m = ctx.match([raw])
-    files = list(ctx.matches(m))
-    return templatekw.compatlist(context, mapping, "file", files)
-
-@templatefunc('fill(text[, width[, initialident[, hangindent]]])')
-def fill(context, mapping, args):
-    """Fill many
-    paragraphs with optional indentation. See the "fill" filter."""
-    if not (1 <= len(args) <= 4):
-        # i18n: "fill" is a keyword
-        raise error.ParseError(_("fill expects one to four arguments"))
-
-    text = evalstring(context, mapping, args[0])
-    width = 76
-    initindent = ''
-    hangindent = ''
-    if 2 <= len(args) <= 4:
-        width = evalinteger(context, mapping, args[1],
-                            # i18n: "fill" is a keyword
-                            _("fill expects an integer width"))
-        try:
-            initindent = evalstring(context, mapping, args[2])
-            hangindent = evalstring(context, mapping, args[3])
-        except IndexError:
-            pass
-
-    return templatefilters.fill(text, width, initindent, hangindent)
-
-@templatefunc('formatnode(node)')
-def formatnode(context, mapping, args):
-    """Obtain the preferred form of a changeset hash. (DEPRECATED)"""
-    if len(args) != 1:
-        # i18n: "formatnode" is a keyword
-        raise error.ParseError(_("formatnode expects one argument"))
-
-    ui = context.resource(mapping, 'ui')
-    node = evalstring(context, mapping, args[0])
-    if ui.debugflag:
-        return node
-    return templatefilters.short(node)
-
-@templatefunc('pad(text, width[, fillchar=\' \'[, left=False]])',
-              argspec='text width fillchar left')
-def pad(context, mapping, args):
-    """Pad text with a
-    fill character."""
-    if 'text' not in args or 'width' not in args:
-        # i18n: "pad" is a keyword
-        raise error.ParseError(_("pad() expects two to four arguments"))
-
-    width = evalinteger(context, mapping, args['width'],
-                        # i18n: "pad" is a keyword
-                        _("pad() expects an integer width"))
-
-    text = evalstring(context, mapping, args['text'])
-
-    left = False
-    fillchar = ' '
-    if 'fillchar' in args:
-        fillchar = evalstring(context, mapping, args['fillchar'])
-        if len(color.stripeffects(fillchar)) != 1:
-            # i18n: "pad" is a keyword
-            raise error.ParseError(_("pad() expects a single fill character"))
-    if 'left' in args:
-        left = evalboolean(context, mapping, args['left'])
-
-    fillwidth = width - encoding.colwidth(color.stripeffects(text))
-    if fillwidth <= 0:
-        return text
-    if left:
-        return fillchar * fillwidth + text
-    else:
-        return text + fillchar * fillwidth
-
-@templatefunc('indent(text, indentchars[, firstline])')
-def indent(context, mapping, args):
-    """Indents all non-empty lines
-    with the characters given in the indentchars string. An optional
-    third parameter will override the indent for the first line only
-    if present."""
-    if not (2 <= len(args) <= 3):
-        # i18n: "indent" is a keyword
-        raise error.ParseError(_("indent() expects two or three arguments"))
-
-    text = evalstring(context, mapping, args[0])
-    indent = evalstring(context, mapping, args[1])
-
-    if len(args) == 3:
-        firstline = evalstring(context, mapping, args[2])
-    else:
-        firstline = indent
-
-    # the indent function doesn't indent the first line, so we do it here
-    return templatefilters.indent(firstline + text, indent)
-
-@templatefunc('get(dict, key)')
-def get(context, mapping, args):
-    """Get an attribute/key from an object. Some keywords
-    are complex types. This function allows you to obtain the value of an
-    attribute on these types."""
-    if len(args) != 2:
-        # i18n: "get" is a keyword
-        raise error.ParseError(_("get() expects two arguments"))
-
-    dictarg = evalfuncarg(context, mapping, args[0])
-    if not util.safehasattr(dictarg, 'get'):
-        # i18n: "get" is a keyword
-        raise error.ParseError(_("get() expects a dict as first argument"))
-
-    key = evalfuncarg(context, mapping, args[1])
-    return _getdictitem(dictarg, key)
-
-def _getdictitem(dictarg, key):
+def getdictitem(dictarg, key):
     val = dictarg.get(key)
     if val is None:
         return
     return templatekw.wraphybridvalue(dictarg, key, val)
 
-@templatefunc('if(expr, then[, else])')
-def if_(context, mapping, args):
-    """Conditionally execute based on the result of
-    an expression."""
-    if not (2 <= len(args) <= 3):
-        # i18n: "if" is a keyword
-        raise error.ParseError(_("if expects two or three arguments"))
-
-    test = evalboolean(context, mapping, args[0])
-    if test:
-        yield evalrawexp(context, mapping, args[1])
-    elif len(args) == 3:
-        yield evalrawexp(context, mapping, args[2])
-
-@templatefunc('ifcontains(needle, haystack, then[, else])')
-def ifcontains(context, mapping, args):
-    """Conditionally execute based
-    on whether the item "needle" is in "haystack"."""
-    if not (3 <= len(args) <= 4):
-        # i18n: "ifcontains" is a keyword
-        raise error.ParseError(_("ifcontains expects three or four arguments"))
-
-    haystack = evalfuncarg(context, mapping, args[1])
-    try:
-        needle = evalastype(context, mapping, args[0],
-                            getattr(haystack, 'keytype', None) or bytes)
-        found = (needle in haystack)
-    except error.ParseError:
-        found = False
-
-    if found:
-        yield evalrawexp(context, mapping, args[2])
-    elif len(args) == 4:
-        yield evalrawexp(context, mapping, args[3])
-
-@templatefunc('ifeq(expr1, expr2, then[, else])')
-def ifeq(context, mapping, args):
-    """Conditionally execute based on
-    whether 2 items are equivalent."""
-    if not (3 <= len(args) <= 4):
-        # i18n: "ifeq" is a keyword
-        raise error.ParseError(_("ifeq expects three or four arguments"))
-
-    test = evalstring(context, mapping, args[0])
-    match = evalstring(context, mapping, args[1])
-    if test == match:
-        yield evalrawexp(context, mapping, args[2])
-    elif len(args) == 4:
-        yield evalrawexp(context, mapping, args[3])
-
-@templatefunc('join(list, sep)')
-def join(context, mapping, args):
-    """Join items in a list with a delimiter."""
-    if not (1 <= len(args) <= 2):
-        # i18n: "join" is a keyword
-        raise error.ParseError(_("join expects one or two arguments"))
-
-    # TODO: perhaps this should be evalfuncarg(), but it can't because hgweb
-    # abuses generator as a keyword that returns a list of dicts.
-    joinset = evalrawexp(context, mapping, args[0])
-    joinset = templatekw.unwrapvalue(joinset)
-    joinfmt = getattr(joinset, 'joinfmt', pycompat.identity)
-    joiner = " "
-    if len(args) > 1:
-        joiner = evalstring(context, mapping, args[1])
-
-    first = True
-    for x in pycompat.maybebytestr(joinset):
-        if first:
-            first = False
-        else:
-            yield joiner
-        yield joinfmt(x)
-
-@templatefunc('label(label, expr)')
-def label(context, mapping, args):
-    """Apply a label to generated content. Content with
-    a label applied can result in additional post-processing, such as
-    automatic colorization."""
-    if len(args) != 2:
-        # i18n: "label" is a keyword
-        raise error.ParseError(_("label expects two arguments"))
-
-    ui = context.resource(mapping, 'ui')
-    thing = evalstring(context, mapping, args[1])
-    # preserve unknown symbol as literal so effects like 'red', 'bold',
-    # etc. don't need to be quoted
-    label = evalstringliteral(context, mapping, args[0])
-
-    return ui.label(thing, label)
-
-@templatefunc('latesttag([pattern])')
-def latesttag(context, mapping, args):
-    """The global tags matching the given pattern on the
-    most recent globally tagged ancestor of this changeset.
-    If no such tags exist, the "{tag}" template resolves to
-    the string "null"."""
-    if len(args) > 1:
-        # i18n: "latesttag" is a keyword
-        raise error.ParseError(_("latesttag expects at most one argument"))
-
-    pattern = None
-    if len(args) == 1:
-        pattern = evalstring(context, mapping, args[0])
-    return templatekw.showlatesttags(context, mapping, pattern)
-
-@templatefunc('localdate(date[, tz])')
-def localdate(context, mapping, args):
-    """Converts a date to the specified timezone.
-    The default is local date."""
-    if not (1 <= len(args) <= 2):
-        # i18n: "localdate" is a keyword
-        raise error.ParseError(_("localdate expects one or two arguments"))
-
-    date = evalfuncarg(context, mapping, args[0])
-    try:
-        date = dateutil.parsedate(date)
-    except AttributeError:  # not str nor date tuple
-        # i18n: "localdate" is a keyword
-        raise error.ParseError(_("localdate expects a date information"))
-    if len(args) >= 2:
-        tzoffset = None
-        tz = evalfuncarg(context, mapping, args[1])
-        if isinstance(tz, bytes):
-            tzoffset, remainder = dateutil.parsetimezone(tz)
-            if remainder:
-                tzoffset = None
-        if tzoffset is None:
-            try:
-                tzoffset = int(tz)
-            except (TypeError, ValueError):
-                # i18n: "localdate" is a keyword
-                raise error.ParseError(_("localdate expects a timezone"))
-    else:
-        tzoffset = dateutil.makedate()[1]
-    return (date[0], tzoffset)
-
-@templatefunc('max(iterable)')
-def max_(context, mapping, args, **kwargs):
-    """Return the max of an iterable"""
-    if len(args) != 1:
-        # i18n: "max" is a keyword
-        raise error.ParseError(_("max expects one argument"))
-
-    iterable = evalfuncarg(context, mapping, args[0])
-    try:
-        x = max(pycompat.maybebytestr(iterable))
-    except (TypeError, ValueError):
-        # i18n: "max" is a keyword
-        raise error.ParseError(_("max first argument should be an iterable"))
-    return templatekw.wraphybridvalue(iterable, x, x)
-
-@templatefunc('min(iterable)')
-def min_(context, mapping, args, **kwargs):
-    """Return the min of an iterable"""
-    if len(args) != 1:
-        # i18n: "min" is a keyword
-        raise error.ParseError(_("min expects one argument"))
-
-    iterable = evalfuncarg(context, mapping, args[0])
-    try:
-        x = min(pycompat.maybebytestr(iterable))
-    except (TypeError, ValueError):
-        # i18n: "min" is a keyword
-        raise error.ParseError(_("min first argument should be an iterable"))
-    return templatekw.wraphybridvalue(iterable, x, x)
-
-@templatefunc('mod(a, b)')
-def mod(context, mapping, args):
-    """Calculate a mod b such that a / b + a mod b == a"""
-    if not len(args) == 2:
-        # i18n: "mod" is a keyword
-        raise error.ParseError(_("mod expects two arguments"))
-
-    func = lambda a, b: a % b
-    return runarithmetic(context, mapping, (func, args[0], args[1]))
-
-@templatefunc('obsfateoperations(markers)')
-def obsfateoperations(context, mapping, args):
-    """Compute obsfate related information based on markers (EXPERIMENTAL)"""
-    if len(args) != 1:
-        # i18n: "obsfateoperations" is a keyword
-        raise error.ParseError(_("obsfateoperations expects one argument"))
-
-    markers = evalfuncarg(context, mapping, args[0])
-
-    try:
-        data = obsutil.markersoperations(markers)
-        return templatekw.hybridlist(data, name='operation')
-    except (TypeError, KeyError):
-        # i18n: "obsfateoperations" is a keyword
-        errmsg = _("obsfateoperations first argument should be an iterable")
-        raise error.ParseError(errmsg)
-
-@templatefunc('obsfatedate(markers)')
-def obsfatedate(context, mapping, args):
-    """Compute obsfate related information based on markers (EXPERIMENTAL)"""
-    if len(args) != 1:
-        # i18n: "obsfatedate" is a keyword
-        raise error.ParseError(_("obsfatedate expects one argument"))
-
-    markers = evalfuncarg(context, mapping, args[0])
-
-    try:
-        data = obsutil.markersdates(markers)
-        return templatekw.hybridlist(data, name='date', fmt='%d %d')
-    except (TypeError, KeyError):
-        # i18n: "obsfatedate" is a keyword
-        errmsg = _("obsfatedate first argument should be an iterable")
-        raise error.ParseError(errmsg)
-
-@templatefunc('obsfateusers(markers)')
-def obsfateusers(context, mapping, args):
-    """Compute obsfate related information based on markers (EXPERIMENTAL)"""
-    if len(args) != 1:
-        # i18n: "obsfateusers" is a keyword
-        raise error.ParseError(_("obsfateusers expects one argument"))
-
-    markers = evalfuncarg(context, mapping, args[0])
-
-    try:
-        data = obsutil.markersusers(markers)
-        return templatekw.hybridlist(data, name='user')
-    except (TypeError, KeyError, ValueError):
-        # i18n: "obsfateusers" is a keyword
-        msg = _("obsfateusers first argument should be an iterable of "
-                "obsmakers")
-        raise error.ParseError(msg)
-
-@templatefunc('obsfateverb(successors, markers)')
-def obsfateverb(context, mapping, args):
-    """Compute obsfate related information based on successors (EXPERIMENTAL)"""
-    if len(args) != 2:
-        # i18n: "obsfateverb" is a keyword
-        raise error.ParseError(_("obsfateverb expects two arguments"))
-
-    successors = evalfuncarg(context, mapping, args[0])
-    markers = evalfuncarg(context, mapping, args[1])
-
-    try:
-        return obsutil.obsfateverb(successors, markers)
-    except TypeError:
-        # i18n: "obsfateverb" is a keyword
-        errmsg = _("obsfateverb first argument should be countable")
-        raise error.ParseError(errmsg)
-
-@templatefunc('relpath(path)')
-def relpath(context, mapping, args):
-    """Convert a repository-absolute path into a filesystem path relative to
-    the current working directory."""
-    if len(args) != 1:
-        # i18n: "relpath" is a keyword
-        raise error.ParseError(_("relpath expects one argument"))
-
-    repo = context.resource(mapping, 'ctx').repo()
-    path = evalstring(context, mapping, args[0])
-    return repo.pathto(path)
-
-@templatefunc('revset(query[, formatargs...])')
-def revset(context, mapping, args):
-    """Execute a revision set query. See
-    :hg:`help revset`."""
-    if not len(args) > 0:
-        # i18n: "revset" is a keyword
-        raise error.ParseError(_("revset expects one or more arguments"))
-
-    raw = evalstring(context, mapping, args[0])
-    ctx = context.resource(mapping, 'ctx')
-    repo = ctx.repo()
-
-    def query(expr):
-        m = revsetmod.match(repo.ui, expr, repo=repo)
-        return m(repo)
-
-    if len(args) > 1:
-        formatargs = [evalfuncarg(context, mapping, a) for a in args[1:]]
-        revs = query(revsetlang.formatspec(raw, *formatargs))
-        revs = list(revs)
-    else:
-        cache = context.resource(mapping, 'cache')
-        revsetcache = cache.setdefault("revsetcache", {})
-        if raw in revsetcache:
-            revs = revsetcache[raw]
-        else:
-            revs = query(raw)
-            revs = list(revs)
-            revsetcache[raw] = revs
-    return templatekw.showrevslist(context, mapping, "revision", revs)
-
-@templatefunc('rstdoc(text, style)')
-def rstdoc(context, mapping, args):
-    """Format reStructuredText."""
-    if len(args) != 2:
-        # i18n: "rstdoc" is a keyword
-        raise error.ParseError(_("rstdoc expects two arguments"))
-
-    text = evalstring(context, mapping, args[0])
-    style = evalstring(context, mapping, args[1])
-
-    return minirst.format(text, style=style, keep=['verbose'])
-
-@templatefunc('separate(sep, args)', argspec='sep *args')
-def separate(context, mapping, args):
-    """Add a separator between non-empty arguments."""
-    if 'sep' not in args:
-        # i18n: "separate" is a keyword
-        raise error.ParseError(_("separate expects at least one argument"))
-
-    sep = evalstring(context, mapping, args['sep'])
-    first = True
-    for arg in args['args']:
-        argstr = evalstring(context, mapping, arg)
-        if not argstr:
-            continue
-        if first:
-            first = False
-        else:
-            yield sep
-        yield argstr
-
-@templatefunc('shortest(node, minlength=4)')
-def shortest(context, mapping, args):
-    """Obtain the shortest representation of
-    a node."""
-    if not (1 <= len(args) <= 2):
-        # i18n: "shortest" is a keyword
-        raise error.ParseError(_("shortest() expects one or two arguments"))
-
-    node = evalstring(context, mapping, args[0])
-
-    minlength = 4
-    if len(args) > 1:
-        minlength = evalinteger(context, mapping, args[1],
-                                # i18n: "shortest" is a keyword
-                                _("shortest() expects an integer minlength"))
-
-    # _partialmatch() of filtered changelog could take O(len(repo)) time,
-    # which would be unacceptably slow. so we look for hash collision in
-    # unfiltered space, which means some hashes may be slightly longer.
-    cl = context.resource(mapping, 'ctx')._repo.unfiltered().changelog
-    return cl.shortest(node, minlength)
-
-@templatefunc('strip(text[, chars])')
-def strip(context, mapping, args):
-    """Strip characters from a string. By default,
-    strips all leading and trailing whitespace."""
-    if not (1 <= len(args) <= 2):
-        # i18n: "strip" is a keyword
-        raise error.ParseError(_("strip expects one or two arguments"))
-
-    text = evalstring(context, mapping, args[0])
-    if len(args) == 2:
-        chars = evalstring(context, mapping, args[1])
-        return text.strip(chars)
-    return text.strip()
-
-@templatefunc('sub(pattern, replacement, expression)')
-def sub(context, mapping, args):
-    """Perform text substitution
-    using regular expressions."""
-    if len(args) != 3:
-        # i18n: "sub" is a keyword
-        raise error.ParseError(_("sub expects three arguments"))
-
-    pat = evalstring(context, mapping, args[0])
-    rpl = evalstring(context, mapping, args[1])
-    src = evalstring(context, mapping, args[2])
-    try:
-        patre = re.compile(pat)
-    except re.error:
-        # i18n: "sub" is a keyword
-        raise error.ParseError(_("sub got an invalid pattern: %s") % pat)
-    try:
-        yield patre.sub(rpl, src)
-    except re.error:
-        # i18n: "sub" is a keyword
-        raise error.ParseError(_("sub got an invalid replacement: %s") % rpl)
-
-@templatefunc('startswith(pattern, text)')
-def startswith(context, mapping, args):
-    """Returns the value from the "text" argument
-    if it begins with the content from the "pattern" argument."""
-    if len(args) != 2:
-        # i18n: "startswith" is a keyword
-        raise error.ParseError(_("startswith expects two arguments"))
-
-    patn = evalstring(context, mapping, args[0])
-    text = evalstring(context, mapping, args[1])
-    if text.startswith(patn):
-        return text
-    return ''
-
-@templatefunc('word(number, text[, separator])')
-def word(context, mapping, args):
-    """Return the nth word from a string."""
-    if not (2 <= len(args) <= 3):
-        # i18n: "word" is a keyword
-        raise error.ParseError(_("word expects two or three arguments, got %d")
-                               % len(args))
-
-    num = evalinteger(context, mapping, args[0],
-                      # i18n: "word" is a keyword
-                      _("word expects an integer index"))
-    text = evalstring(context, mapping, args[1])
-    if len(args) == 3:
-        splitter = evalstring(context, mapping, args[2])
-    else:
-        splitter = None
-
-    tokens = text.split(splitter)
-    if num >= len(tokens) or num < -len(tokens):
-        return ''
-    else:
-        return tokens[num]
-
-# methods to interpret function arguments or inner expressions (e.g. {_(x)})
-exprmethods = {
-    "integer": lambda e, c: (runinteger, e[1]),
-    "string": lambda e, c: (runstring, e[1]),
-    "symbol": lambda e, c: (runsymbol, e[1]),
-    "template": buildtemplate,
-    "group": lambda e, c: compileexp(e[1], c, exprmethods),
-    ".": buildmember,
-    "|": buildfilter,
-    "%": buildmap,
-    "func": buildfunc,
-    "keyvalue": buildkeyvaluepair,
-    "+": lambda e, c: buildarithmetic(e, c, lambda a, b: a + b),
-    "-": lambda e, c: buildarithmetic(e, c, lambda a, b: a - b),
-    "negate": buildnegate,
-    "*": lambda e, c: buildarithmetic(e, c, lambda a, b: a * b),
-    "/": lambda e, c: buildarithmetic(e, c, lambda a, b: a // b),
-    }
-
-# methods to interpret top-level template (e.g. {x}, {x|_}, {x % "y"})
-methods = exprmethods.copy()
-methods["integer"] = exprmethods["symbol"]  # '{1}' as variable
-
-class _aliasrules(parser.basealiasrules):
-    """Parsing and expansion rule set of template aliases"""
-    _section = _('template alias')
-    _parse = staticmethod(_parseexpr)
-
-    @staticmethod
-    def _trygetfunc(tree):
-        """Return (name, args) if tree is func(...) or ...|filter; otherwise
-        None"""
-        if tree[0] == 'func' and tree[1][0] == 'symbol':
-            return tree[1][1], getlist(tree[2])
-        if tree[0] == '|' and tree[2][0] == 'symbol':
-            return tree[2][1], [tree[1]]
-
-def expandaliases(tree, aliases):
-    """Return new tree of aliases are expanded"""
-    aliasmap = _aliasrules.buildmap(aliases)
-    return _aliasrules.expand(aliasmap, tree)
-
-# template engine
-
 stringify = templatefilters.stringify
-
-def _flatten(thing):
-    '''yield a single stream from a possibly nested set of iterators'''
-    thing = templatekw.unwraphybrid(thing)
-    if isinstance(thing, bytes):
-        yield thing
-    elif isinstance(thing, str):
-        # We can only hit this on Python 3, and it's here to guard
-        # against infinite recursion.
-        raise error.ProgrammingError('Mercurial IO including templates is done'
-                                     ' with bytes, not strings, got %r' % thing)
-    elif thing is None:
-        pass
-    elif not util.safehasattr(thing, '__iter__'):
-        yield pycompat.bytestr(thing)
-    else:
-        for i in thing:
-            i = templatekw.unwraphybrid(i)
-            if isinstance(i, bytes):
-                yield i
-            elif i is None:
-                pass
-            elif not util.safehasattr(i, '__iter__'):
-                yield pycompat.bytestr(i)
-            else:
-                for j in _flatten(i):
-                    yield j
-
-def unquotestring(s):
-    '''unwrap quotes if any; otherwise returns unmodified string'''
-    if len(s) < 2 or s[0] not in "'\"" or s[0] != s[-1]:
-        return s
-    return s[1:-1]
-
-class engine(object):
-    '''template expansion engine.
-
-    template expansion works like this. a map file contains key=value
-    pairs. if value is quoted, it is treated as string. otherwise, it
-    is treated as name of template file.
-
-    templater is asked to expand a key in map. it looks up key, and
-    looks for strings like this: {foo}. it expands {foo} by looking up
-    foo in map, and substituting it. expansion is recursive: it stops
-    when there is no more {foo} to replace.
-
-    expansion also allows formatting and filtering.
-
-    format uses key to expand each item in list. syntax is
-    {key%format}.
-
-    filter uses function to transform value. syntax is
-    {key|filter1|filter2|...}.'''
-
-    def __init__(self, loader, filters=None, defaults=None, resources=None,
-                 aliases=()):
-        self._loader = loader
-        if filters is None:
-            filters = {}
-        self._filters = filters
-        self._funcs = funcs  # make this a parameter if needed
-        if defaults is None:
-            defaults = {}
-        if resources is None:
-            resources = {}
-        self._defaults = defaults
-        self._resources = resources
-        self._aliasmap = _aliasrules.buildmap(aliases)
-        self._cache = {}  # key: (func, data)
-
-    def symbol(self, mapping, key):
-        """Resolve symbol to value or function; None if nothing found"""
-        v = None
-        if key not in self._resources:
-            v = mapping.get(key)
-        if v is None:
-            v = self._defaults.get(key)
-        return v
-
-    def resource(self, mapping, key):
-        """Return internal data (e.g. cache) used for keyword/function
-        evaluation"""
-        v = None
-        if key in self._resources:
-            v = mapping.get(key)
-        if v is None:
-            v = self._resources.get(key)
-        if v is None:
-            raise ResourceUnavailable(_('template resource not available: %s')
-                                      % key)
-        return v
-
-    def _load(self, t):
-        '''load, parse, and cache a template'''
-        if t not in self._cache:
-            # put poison to cut recursion while compiling 't'
-            self._cache[t] = (_runrecursivesymbol, t)
-            try:
-                x = parse(self._loader(t))
-                if self._aliasmap:
-                    x = _aliasrules.expand(self._aliasmap, x)
-                self._cache[t] = compileexp(x, self, methods)
-            except: # re-raises
-                del self._cache[t]
-                raise
-        return self._cache[t]
-
-    def process(self, t, mapping):
-        '''Perform expansion. t is name of map element to expand.
-        mapping contains added elements for use during expansion. Is a
-        generator.'''
-        func, data = self._load(t)
-        return _flatten(func(self, mapping, data))
-
-engines = {'default': engine}
-
-def stylelist():
-    paths = templatepaths()
-    if not paths:
-        return _('no templates found, try `hg debuginstall` for more info')
-    dirlist = os.listdir(paths[0])
-    stylelist = []
-    for file in dirlist:
-        split = file.split(".")
-        if split[-1] in ('orig', 'rej'):
-            continue
-        if split[0] == "map-cmdline":
-            stylelist.append(split[1])
-    return ", ".join(sorted(stylelist))
-
-def _readmapfile(mapfile):
-    """Load template elements from the given map file"""
-    if not os.path.exists(mapfile):
-        raise error.Abort(_("style '%s' not found") % mapfile,
-                          hint=_("available styles: %s") % stylelist())
-
-    base = os.path.dirname(mapfile)
-    conf = config.config(includepaths=templatepaths())
-    conf.read(mapfile, remap={'': 'templates'})
-
-    cache = {}
-    tmap = {}
-    aliases = []
-
-    val = conf.get('templates', '__base__')
-    if val and val[0] not in "'\"":
-        # treat as a pointer to a base class for this style
-        path = util.normpath(os.path.join(base, val))
-
-        # fallback check in template paths
-        if not os.path.exists(path):
-            for p in templatepaths():
-                p2 = util.normpath(os.path.join(p, val))
-                if os.path.isfile(p2):
-                    path = p2
-                    break
-                p3 = util.normpath(os.path.join(p2, "map"))
-                if os.path.isfile(p3):
-                    path = p3
-                    break
-
-        cache, tmap, aliases = _readmapfile(path)
-
-    for key, val in conf['templates'].items():
-        if not val:
-            raise error.ParseError(_('missing value'),
-                                   conf.source('templates', key))
-        if val[0] in "'\"":
-            if val[0] != val[-1]:
-                raise error.ParseError(_('unmatched quotes'),
-                                       conf.source('templates', key))
-            cache[key] = unquotestring(val)
-        elif key != '__base__':
-            val = 'default', val
-            if ':' in val[1]:
-                val = val[1].split(':', 1)
-            tmap[key] = val[0], os.path.join(base, val[1])
-    aliases.extend(conf['templatealias'].items())
-    return cache, tmap, aliases
-
-class templater(object):
-
-    def __init__(self, filters=None, defaults=None, resources=None,
-                 cache=None, aliases=(), minchunk=1024, maxchunk=65536):
-        """Create template engine optionally with preloaded template fragments
-
-        - ``filters``: a dict of functions to transform a value into another.
-        - ``defaults``: a dict of symbol values/functions; may be overridden
-          by a ``mapping`` dict.
-        - ``resources``: a dict of internal data (e.g. cache), inaccessible
-          from user template; may be overridden by a ``mapping`` dict.
-        - ``cache``: a dict of preloaded template fragments.
-        - ``aliases``: a list of alias (name, replacement) pairs.
-
-        self.cache may be updated later to register additional template
-        fragments.
-        """
-        if filters is None:
-            filters = {}
-        if defaults is None:
-            defaults = {}
-        if resources is None:
-            resources = {}
-        if cache is None:
-            cache = {}
-        self.cache = cache.copy()
-        self.map = {}
-        self.filters = templatefilters.filters.copy()
-        self.filters.update(filters)
-        self.defaults = defaults
-        self._resources = {'templ': self}
-        self._resources.update(resources)
-        self._aliases = aliases
-        self.minchunk, self.maxchunk = minchunk, maxchunk
-        self.ecache = {}
-
-    @classmethod
-    def frommapfile(cls, mapfile, filters=None, defaults=None, resources=None,
-                    cache=None, minchunk=1024, maxchunk=65536):
-        """Create templater from the specified map file"""
-        t = cls(filters, defaults, resources, cache, [], minchunk, maxchunk)
-        cache, tmap, aliases = _readmapfile(mapfile)
-        t.cache.update(cache)
-        t.map = tmap
-        t._aliases = aliases
-        return t
-
-    def __contains__(self, key):
-        return key in self.cache or key in self.map
-
-    def load(self, t):
-        '''Get the template for the given template name. Use a local cache.'''
-        if t not in self.cache:
-            try:
-                self.cache[t] = util.readfile(self.map[t][1])
-            except KeyError as inst:
-                raise TemplateNotFound(_('"%s" not in template map') %
-                                       inst.args[0])
-            except IOError as inst:
-                reason = (_('template file %s: %s')
-                          % (self.map[t][1], util.forcebytestr(inst.args[1])))
-                raise IOError(inst.args[0], encoding.strfromlocal(reason))
-        return self.cache[t]
-
-    def render(self, mapping):
-        """Render the default unnamed template and return result as string"""
-        mapping = pycompat.strkwargs(mapping)
-        return stringify(self('', **mapping))
-
-    def __call__(self, t, **mapping):
-        mapping = pycompat.byteskwargs(mapping)
-        ttype = t in self.map and self.map[t][0] or 'default'
-        if ttype not in self.ecache:
-            try:
-                ecls = engines[ttype]
-            except KeyError:
-                raise error.Abort(_('invalid template engine: %s') % ttype)
-            self.ecache[ttype] = ecls(self.load, self.filters, self.defaults,
-                                      self._resources, self._aliases)
-        proc = self.ecache[ttype]
-
-        stream = proc.process(t, mapping)
-        if self.minchunk:
-            stream = util.increasingchunks(stream, min=self.minchunk,
-                                           max=self.maxchunk)
-        return stream
-
-def templatepaths():
-    '''return locations used for template files.'''
-    pathsrel = ['templates']
-    paths = [os.path.normpath(os.path.join(util.datapath, f))
-             for f in pathsrel]
-    return [p for p in paths if os.path.isdir(p)]
-
-def templatepath(name):
-    '''return location of template file. returns None if not found.'''
-    for p in templatepaths():
-        f = os.path.join(p, name)
-        if os.path.exists(f):
-            return f
-    return None
-
-def stylemap(styles, paths=None):
-    """Return path to mapfile for a given style.
-
-    Searches mapfile in the following locations:
-    1. templatepath/style/map
-    2. templatepath/map-style
-    3. templatepath/map
-    """
-
-    if paths is None:
-        paths = templatepaths()
-    elif isinstance(paths, bytes):
-        paths = [paths]
-
-    if isinstance(styles, bytes):
-        styles = [styles]
-
-    for style in styles:
-        # only plain name is allowed to honor template paths
-        if (not style
-            or style in (pycompat.oscurdir, pycompat.ospardir)
-            or pycompat.ossep in style
-            or pycompat.osaltsep and pycompat.osaltsep in style):
-            continue
-        locations = [os.path.join(style, 'map'), 'map-' + style]
-        locations.append('map')
-
-        for path in paths:
-            for location in locations:
-                mapfile = os.path.join(path, location)
-                if os.path.isfile(mapfile):
-                    return style, mapfile
-
-    raise RuntimeError("No hgweb templates found in %r" % paths)
-
-def loadfunction(ui, extname, registrarobj):
-    """Load template function from specified registrarobj
-    """
-    for name, func in registrarobj._table.iteritems():
-        funcs[name] = func
-
-# tell hggettext to extract docstrings from these functions:
-i18nfunctions = funcs.values()