Mercurial > hg
view mercurial/templater.py @ 29816:034412ca28c3
templater: fix if() to not evaluate False as bool('False')
Before, False was True. This patch fixes the issue by processing True/False
transparently. The other values (including integer 0) are tested as strings
for backward compatibility, which means "if(latesttagdistance)" never be False.
Should we change the behavior of "if(0)" as well?
author | Yuya Nishihara <yuya@tcha.org> |
---|---|
date | Thu, 18 Aug 2016 16:29:22 +0900 |
parents | 0d5cc0c18b4e |
children | cc11079644fc |
line wrap: on
line source
# templater.py - template expansion for output # # Copyright 2005, 2006 Matt Mackall <mpm@selenic.com> # # This software may be used and distributed according to the terms of the # GNU General Public License version 2 or any later version. from __future__ import absolute_import import os import re import types from .i18n import _ from . import ( config, error, minirst, parser, registrar, revset as revsetmod, templatefilters, templatekw, util, ) # template parsing elements = { # token-type: binding-strength, primary, prefix, infix, suffix "(": (20, None, ("group", 1, ")"), ("func", 1, ")"), None), ",": (2, None, None, ("list", 2), None), "|": (5, None, None, ("|", 5), None), "%": (6, None, None, ("%", 6), 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 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() or c == '-': s = pos if c == '-': # simply take negate operator as part of integer pos += 1 if pos >= end or not program[pos].isdigit(): raise error.ParseError(_("integer literal without digits"), s) pos += 1 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 (r"\'", r'\"') or c == 'r' and program[pos:pos + 3] in (r"r\'", r'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 + 1) 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('foo{bar}"baz', 0, 12) ([('string', 'foo'), ('symbol', 'bar'), ('string', '"baz')], 12) >>> _parsetemplate('foo{bar}"baz', 0, 12, quote='"') ([('string', 'foo'), ('symbol', 'bar')], 9) >>> _parsetemplate('foo"{bar}', 0, 9, quote='"') ([('string', 'foo')], 4) >>> _parsetemplate(r'foo\"bar"baz', 0, 12, quote='"') ([('string', 'foo"'), ('string', 'bar')], 9) >>> _parsetemplate(r'foo\\"bar', 0, 10, quote='"') ([('string', 'foo\\')], 6) """ parsed = [] sepchars = '{' + quote pos = start p = parser.parser(elements) while pos < stop: n = min((tmpl.find(c, pos, stop) for c in sepchars), key=lambda n: (n < 0, n)) if n < 0: parsed.append(('string', parser.unescapestr(tmpl[pos:stop]))) pos = stop break c = tmpl[n] bs = (n - pos) - len(tmpl[pos:n].rstrip('\\')) if bs % 2 == 1: # escaped (e.g. '\{', '\\\{', but not '\\{') parsed.append(('string', parser.unescapestr(tmpl[pos:n - 1]) + c)) pos = n + 1 continue if n > pos: parsed.append(('string', parser.unescapestr(tmpl[pos:n]))) if c == quote: return parsed, n + 1 parseres, pos = p.parse(tokenize(tmpl, n + 1, stop, '}')) parsed.append(parseres) if quote: raise error.ParseError(_("unterminated string"), start) return parsed, pos def _unnesttemplatelist(tree): """Expand list of templates to node tuple >>> def f(tree): ... print prettyformat(_unnesttemplatelist(tree)) >>> f(('template', [])) ('string', '') >>> f(('template', [('string', 'foo')])) ('string', 'foo') >>> f(('template', [('string', 'foo'), ('symbol', 'rev')])) (template ('string', 'foo') ('symbol', 'rev')) >>> f(('template', [('symbol', 'rev')])) # template(rev) -> str (template ('symbol', 'rev')) >>> f(('template', [('template', [('string', '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('"foo"') ('string', 'foo') >>> _parseexpr('foo(bar)') ('func', ('symbol', 'foo'), ('symbol', 'bar')) >>> _parseexpr('foo(') Traceback (most recent call last): ... ParseError: ('not a prefix: end', 4) >>> _parseexpr('"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""" 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 evalfuncarg(context, mapping, arg): func, data = arg # func() may return string, generator of strings or arbitrary object such # as date tuple, but filter does not want generator. thing = func(context, mapping, data) if isinstance(thing, types.GeneratorType): thing = stringify(thing) return thing def evalboolean(context, mapping, arg): func, data = arg thing = func(context, mapping, data) 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): v = evalfuncarg(context, mapping, arg) try: return int(v) except (TypeError, ValueError): raise error.ParseError(err) def evalstring(context, mapping, arg): func, data = arg return stringify(func(context, mapping, data)) 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) 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 = mapping.get(key) if v is None: v = context._defaults.get(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): return v(**mapping) 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 func, data in template: yield func(context, mapping, data) def buildfilter(exp, context): arg = compileexp(exp[1], context, methods) n = getsymbol(exp[2]) if n in context._filters: filt = context._filters[n] return (runfilter, (arg, filt)) if n in funcs: f = funcs[n] return (f, [arg]) 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): if isinstance(arg[1], tuple): dt = arg[1][1] else: dt = arg[1] raise error.Abort(_("template filter '%s' is not compatible with " "keyword '%s'") % (filt.func_name, dt)) def buildmap(exp, context): func, data = compileexp(exp[1], context, methods) tfunc, tdata = gettemplate(exp[2], context) return (runmap, (func, data, tfunc, tdata)) def runmap(context, mapping, data): func, data, tfunc, tdata = data d = func(context, mapping, data) if util.safehasattr(d, 'itermaps'): diter = d.itermaps() else: try: diter = iter(d) except TypeError: if func is runsymbol: raise error.ParseError(_("keyword '%s' is not iterable") % data) else: raise error.ParseError(_("%r is not iterable") % d) for i in diter: lm = mapping.copy() if isinstance(i, dict): lm.update(i) lm['originalnode'] = mapping.get('node') yield tfunc(context, lm, tdata) 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 i def buildfunc(exp, context): n = getsymbol(exp[1]) args = [compileexp(x, context, exprmethods) for x in getlist(exp[2])] if n in funcs: f = funcs[n] return (f, args) if n in context._filters: 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) # 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 util.datestr(date) else: return util.datestr(date, fmt) except (TypeError, ValueError): # i18n: "date" is a keyword raise error.ParseError(_("date expects a date information")) @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 = mapping['ctx'] chunks = ctx.diff(match=ctx.match([], getpatterns(0), getpatterns(1))) return ''.join(chunks) @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('pad(text, width[, fillchar=\' \'[, right=False]])') def pad(context, mapping, args): """Pad text with a fill character.""" if not (2 <= len(args) <= 4): # i18n: "pad" is a keyword raise error.ParseError(_("pad() expects two to four arguments")) width = evalinteger(context, mapping, args[1], # i18n: "pad" is a keyword _("pad() expects an integer width")) text = evalstring(context, mapping, args[0]) right = False fillchar = ' ' if len(args) > 2: fillchar = evalstring(context, mapping, args[2]) if len(args) > 3: right = util.parsebool(args[3][1]) if right: return text.rjust(width, fillchar) else: return text.ljust(width, fillchar) @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 dictarg.get(key) @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 args[1][0](context, mapping, args[1][1]) elif len(args) == 3: yield args[2][0](context, mapping, args[2][1]) @templatefunc('ifcontains(search, thing, then[, else])') def ifcontains(context, mapping, args): """Conditionally execute based on whether the item "search" is in "thing".""" if not (3 <= len(args) <= 4): # i18n: "ifcontains" is a keyword raise error.ParseError(_("ifcontains expects three or four arguments")) item = evalstring(context, mapping, args[0]) items = evalfuncarg(context, mapping, args[1]) if item in items: yield args[2][0](context, mapping, args[2][1]) elif len(args) == 4: yield args[3][0](context, mapping, args[3][1]) @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 args[2][0](context, mapping, args[2][1]) elif len(args) == 4: yield args[3][0](context, mapping, args[3][1]) @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")) joinset = args[0][0](context, mapping, args[0][1]) if util.safehasattr(joinset, 'itermaps'): jf = joinset.joinfmt joinset = [jf(x) for x in joinset.itermaps()] joiner = " " if len(args) > 1: joiner = evalstring(context, mapping, args[1]) first = True for x in joinset: if first: first = False else: yield joiner yield 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 = 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 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(pattern, **mapping) @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 = util.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, str): tzoffset, remainder = util.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 = util.makedate()[1] return (date[0], tzoffset) @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 = mapping['ctx'] repo = ctx.repo() def query(expr): m = revsetmod.match(repo.ui, expr) return m(repo) if len(args) > 1: formatargs = [evalfuncarg(context, mapping, a) for a in args[1:]] revs = query(revsetmod.formatspec(raw, *formatargs)) revs = list(revs) else: revsetcache = mapping['cache'].setdefault("revsetcache", {}) if raw in revsetcache: revs = revsetcache[raw] else: revs = query(raw) revs = list(revs) revsetcache[raw] = revs return templatekw.showrevslist("revision", revs, **mapping) @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)') def separate(context, mapping, args): """Add a separator between non-empty arguments.""" if not args: # i18n: "separate" is a keyword raise error.ParseError(_("separate expects at least one argument")) sep = evalstring(context, mapping, args[0]) first = True for arg in args[1:]: 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")) cl = mapping['ctx']._repo.changelog def isvalid(test): try: try: cl.index.partialmatch(test) except AttributeError: # Pure mercurial doesn't support partialmatch on the index. # Fallback to the slow way. if cl._partialmatch(test) is None: return False try: i = int(test) # if we are a pure int, then starting with zero will not be # confused as a rev; or, obviously, if the int is larger than # the value of the tip rev if test[0] == '0' or i > len(cl): return True return False except ValueError: return True except error.RevlogError: return False shortest = node startlength = max(6, minlength) length = startlength while True: test = node[:length] if isvalid(test): shortest = test if length == minlength or length > startlength: return shortest length -= 1 else: length += 1 if len(shortest) <= length: return shortest @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, } # 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''' if isinstance(thing, str): yield thing elif thing is None: pass elif not util.safehasattr(thing, '__iter__'): yield str(thing) else: for i in thing: if isinstance(i, str): yield i elif i is None: pass elif not util.safehasattr(i, '__iter__'): yield str(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, aliases=()): self._loader = loader if filters is None: filters = {} self._filters = filters if defaults is None: defaults = {} self._defaults = defaults self._aliasmap = _aliasrules.buildmap(aliases) self._cache = {} # key: (func, data) 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) cache = {} tmap = {} for key, val in conf[''].items(): if not val: raise error.ParseError(_('missing value'), conf.source('', key)) if val[0] in "'\"": if val[0] != val[-1]: raise error.ParseError(_('unmatched quotes'), conf.source('', key)) cache[key] = unquotestring(val) elif key == "__base__": # treat as a pointer to a base class for this style path = util.normpath(os.path.join(base, val)) bcache, btmap = _readmapfile(path) for k in bcache: if k not in cache: cache[k] = bcache[k] for k in btmap: if k not in tmap: tmap[k] = btmap[k] else: val = 'default', val if ':' in val[1]: val = val[1].split(':', 1) tmap[key] = val[0], os.path.join(base, val[1]) return cache, tmap class TemplateNotFound(error.Abort): pass class templater(object): def __init__(self, filters=None, defaults=None, cache=None, aliases=(), minchunk=1024, maxchunk=65536): '''set up template engine. filters is dict of functions. each transforms a value into another. defaults is dict of default map definitions. aliases is list of alias (name, replacement) pairs. ''' if filters is None: filters = {} if defaults is None: defaults = {} if cache is None: cache = {} self.cache = cache.copy() self.map = {} self.filters = templatefilters.filters.copy() self.filters.update(filters) self.defaults = defaults self._aliases = aliases self.minchunk, self.maxchunk = minchunk, maxchunk self.ecache = {} @classmethod def frommapfile(cls, mapfile, filters=None, defaults=None, cache=None, minchunk=1024, maxchunk=65536): """Create templater from the specified map file""" t = cls(filters, defaults, cache, [], minchunk, maxchunk) cache, tmap = _readmapfile(mapfile) t.cache.update(cache) t.map = tmap 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: raise IOError(inst.args[0], _('template file %s: %s') % (self.map[t][1], inst.args[1])) return self.cache[t] def __call__(self, t, **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._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, str): paths = [paths] if isinstance(styles, str): styles = [styles] for style in styles: # only plain name is allowed to honor template paths if (not style or style in (os.curdir, os.pardir) or os.sep in style or os.altsep and os.altsep 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()