author | Gregory Szorc <gregory.szorc@gmail.com> |
Sat, 08 Jul 2017 14:15:07 -0700 | |
changeset 33371 | c6415195fa78 |
parent 31922 | 0f41f1e3c75c |
child 34043 | 90896b61fe26 |
permissions | -rw-r--r-- |
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# parser.py - simple top-down operator precedence parser for mercurial |
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# |
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# Copyright 2010 Matt Mackall <mpm@selenic.com> |
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# |
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# This software may be used and distributed according to the terms of the |
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# GNU General Public License version 2 or any later version. |
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# see http://effbot.org/zone/simple-top-down-parsing.htm and |
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# http://eli.thegreenplace.net/2010/01/02/top-down-operator-precedence-parsing/ |
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# for background |
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# takes a tokenizer and elements |
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# tokenizer is an iterator that returns (type, value, pos) tuples |
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# elements is a mapping of types to binding strength, primary, prefix, infix |
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# and suffix actions |
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# an action is a tree node name, a tree label, and an optional match |
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# __call__(program) parses program into a labeled tree |
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from __future__ import absolute_import |
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from .i18n import _ |
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from . import ( |
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error, |
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util, |
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) |
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class parser(object): |
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def __init__(self, elements, methods=None): |
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self._elements = elements |
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self._methods = methods |
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self.current = None |
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def _advance(self): |
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'advance the tokenizer' |
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t = self.current |
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self.current = next(self._iter, None) |
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return t |
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def _hasnewterm(self): |
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'True if next token may start new term' |
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return any(self._elements[self.current[0]][1:3]) |
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def _match(self, m): |
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'make sure the tokenizer matches an end condition' |
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if self.current[0] != m: |
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raise error.ParseError(_("unexpected token: %s") % self.current[0], |
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self.current[2]) |
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self._advance() |
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def _parseoperand(self, bind, m=None): |
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'gather right-hand-side operand until an end condition or binding met' |
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if m and self.current[0] == m: |
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expr = None |
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else: |
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expr = self._parse(bind) |
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if m: |
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self._match(m) |
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return expr |
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def _parse(self, bind=0): |
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token, value, pos = self._advance() |
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# handle prefix rules on current token, take as primary if unambiguous |
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primary, prefix = self._elements[token][1:3] |
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if primary and not (prefix and self._hasnewterm()): |
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expr = (primary, value) |
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elif prefix: |
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expr = (prefix[0], self._parseoperand(*prefix[1:])) |
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else: |
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raise error.ParseError(_("not a prefix: %s") % token, pos) |
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# gather tokens until we meet a lower binding strength |
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while bind < self._elements[self.current[0]][0]: |
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token, value, pos = self._advance() |
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# handle infix rules, take as suffix if unambiguous |
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infix, suffix = self._elements[token][3:] |
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if suffix and not (infix and self._hasnewterm()): |
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expr = (suffix, expr) |
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elif infix: |
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expr = (infix[0], expr, self._parseoperand(*infix[1:])) |
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else: |
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raise error.ParseError(_("not an infix: %s") % token, pos) |
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return expr |
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def parse(self, tokeniter): |
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'generate a parse tree from tokens' |
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self._iter = tokeniter |
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self._advance() |
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res = self._parse() |
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token, value, pos = self.current |
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return res, pos |
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def eval(self, tree): |
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'recursively evaluate a parse tree using node methods' |
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if not isinstance(tree, tuple): |
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return tree |
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return self._methods[tree[0]](*[self.eval(t) for t in tree[1:]]) |
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def __call__(self, tokeniter): |
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'parse tokens into a parse tree and evaluate if methods given' |
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t = self.parse(tokeniter) |
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if self._methods: |
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return self.eval(t) |
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return t |
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def splitargspec(spec): |
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"""Parse spec of function arguments into (poskeys, varkey, keys, optkey) |
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>>> splitargspec('') |
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([], None, [], None) |
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>>> splitargspec('foo bar') |
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([], None, ['foo', 'bar'], None) |
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>>> splitargspec('foo *bar baz **qux') |
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(['foo'], 'bar', ['baz'], 'qux') |
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>>> splitargspec('*foo') |
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([], 'foo', [], None) |
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>>> splitargspec('**foo') |
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([], None, [], 'foo') |
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""" |
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optkey = None |
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pre, sep, post = spec.partition('**') |
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if sep: |
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posts = post.split() |
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if not posts: |
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raise error.ProgrammingError('no **optkey name provided') |
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if len(posts) > 1: |
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raise error.ProgrammingError('excessive **optkey names provided') |
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optkey = posts[0] |
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pre, sep, post = pre.partition('*') |
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pres = pre.split() |
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posts = post.split() |
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if sep: |
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if not posts: |
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raise error.ProgrammingError('no *varkey name provided') |
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return pres, posts[0], posts[1:], optkey |
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return [], None, pres, optkey |
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def buildargsdict(trees, funcname, argspec, keyvaluenode, keynode): |
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"""Build dict from list containing positional and keyword arguments |
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Arguments are specified by a tuple of ``(poskeys, varkey, keys, optkey)`` |
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where |
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|
134 |
|
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135 |
- ``poskeys``: list of names of positional arguments |
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136 |
- ``varkey``: optional argument name that takes up remainder |
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137 |
- ``keys``: list of names that can be either positional or keyword arguments |
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138 |
- ``optkey``: optional argument name that takes up excess keyword arguments |
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|
139 |
|
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140 |
If ``varkey`` specified, all ``keys`` must be given as keyword arguments. |
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|
141 |
|
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142 |
Invalid keywords, too few positional arguments, or too many positional |
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143 |
arguments are rejected, but missing keyword arguments are just omitted. |
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144 |
""" |
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145 |
poskeys, varkey, keys, optkey = argspec |
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146 |
kwstart = next((i for i, x in enumerate(trees) if x[0] == keyvaluenode), |
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147 |
len(trees)) |
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148 |
if kwstart < len(poskeys): |
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149 |
raise error.ParseError(_("%(func)s takes at least %(nargs)d positional " |
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150 |
"arguments") |
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151 |
% {'func': funcname, 'nargs': len(poskeys)}) |
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152 |
if not varkey and kwstart > len(poskeys) + len(keys): |
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153 |
raise error.ParseError(_("%(func)s takes at most %(nargs)d positional " |
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154 |
"arguments") |
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155 |
% {'func': funcname, |
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156 |
'nargs': len(poskeys) + len(keys)}) |
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157 |
args = util.sortdict() |
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158 |
# consume positional arguments |
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159 |
for k, x in zip(poskeys, trees[:kwstart]): |
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160 |
args[k] = x |
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161 |
if varkey: |
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162 |
args[varkey] = trees[len(args):kwstart] |
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163 |
else: |
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164 |
for k, x in zip(keys, trees[len(args):kwstart]): |
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165 |
args[k] = x |
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166 |
# remainder should be keyword arguments |
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167 |
if optkey: |
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168 |
args[optkey] = util.sortdict() |
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169 |
for x in trees[kwstart:]: |
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170 |
if x[0] != keyvaluenode or x[1][0] != keynode: |
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171 |
raise error.ParseError(_("%(func)s got an invalid argument") |
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172 |
% {'func': funcname}) |
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173 |
k = x[1][1] |
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174 |
if k in keys: |
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175 |
d = args |
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176 |
elif not optkey: |
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177 |
raise error.ParseError(_("%(func)s got an unexpected keyword " |
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178 |
"argument '%(key)s'") |
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179 |
% {'func': funcname, 'key': k}) |
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180 |
else: |
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181 |
d = args[optkey] |
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182 |
if k in d: |
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183 |
raise error.ParseError(_("%(func)s got multiple values for keyword " |
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184 |
"argument '%(key)s'") |
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185 |
% {'func': funcname, 'key': k}) |
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186 |
d[k] = x[2] |
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187 |
return args |
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188 |
|
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189 |
def unescapestr(s): |
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190 |
try: |
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191 |
return util.unescapestr(s) |
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192 |
except ValueError as e: |
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193 |
# mangle Python's exception into our format |
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194 |
raise error.ParseError(str(e).lower()) |
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195 |
|
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196 |
def _prettyformat(tree, leafnodes, level, lines): |
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197 |
if not isinstance(tree, tuple) or tree[0] in leafnodes: |
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198 |
lines.append((level, str(tree))) |
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199 |
else: |
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200 |
lines.append((level, '(%s' % tree[0])) |
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201 |
for s in tree[1:]: |
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202 |
_prettyformat(s, leafnodes, level + 1, lines) |
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203 |
lines[-1:] = [(lines[-1][0], lines[-1][1] + ')')] |
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204 |
|
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205 |
def prettyformat(tree, leafnodes): |
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206 |
lines = [] |
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207 |
_prettyformat(tree, leafnodes, 0, lines) |
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208 |
output = '\n'.join((' ' * l + s) for l, s in lines) |
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209 |
return output |
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|
210 |
|
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211 |
def simplifyinfixops(tree, targetnodes): |
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212 |
"""Flatten chained infix operations to reduce usage of Python stack |
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213 |
|
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|
214 |
>>> def f(tree): |
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215 |
... print prettyformat(simplifyinfixops(tree, ('or',)), ('symbol',)) |
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216 |
>>> f(('or', |
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217 |
... ('or', |
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218 |
... ('symbol', '1'), |
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219 |
... ('symbol', '2')), |
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220 |
... ('symbol', '3'))) |
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221 |
(or |
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222 |
('symbol', '1') |
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223 |
('symbol', '2') |
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224 |
('symbol', '3')) |
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225 |
>>> f(('func', |
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226 |
... ('symbol', 'p1'), |
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227 |
... ('or', |
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228 |
... ('or', |
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229 |
... ('func', |
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230 |
... ('symbol', 'sort'), |
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231 |
... ('list', |
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232 |
... ('or', |
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233 |
... ('or', |
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234 |
... ('symbol', '1'), |
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235 |
... ('symbol', '2')), |
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236 |
... ('symbol', '3')), |
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237 |
... ('negate', |
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238 |
... ('symbol', 'rev')))), |
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239 |
... ('and', |
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240 |
... ('symbol', '4'), |
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|
241 |
... ('group', |
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... ('or', |
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... ('or', |
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... ('symbol', '5'), |
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... ('symbol', '6')), |
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... ('symbol', '7'))))), |
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... ('symbol', '8')))) |
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248 |
(func |
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249 |
('symbol', 'p1') |
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250 |
(or |
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251 |
(func |
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252 |
('symbol', 'sort') |
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253 |
(list |
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254 |
(or |
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255 |
('symbol', '1') |
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256 |
('symbol', '2') |
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257 |
('symbol', '3')) |
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258 |
(negate |
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259 |
('symbol', 'rev')))) |
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260 |
(and |
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261 |
('symbol', '4') |
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262 |
(group |
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263 |
(or |
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264 |
('symbol', '5') |
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265 |
('symbol', '6') |
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266 |
('symbol', '7')))) |
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267 |
('symbol', '8'))) |
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268 |
""" |
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269 |
if not isinstance(tree, tuple): |
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return tree |
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op = tree[0] |
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if op not in targetnodes: |
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return (op,) + tuple(simplifyinfixops(x, targetnodes) for x in tree[1:]) |
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274 |
|
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# walk down left nodes taking each right node. no recursion to left nodes |
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# because infix operators are left-associative, i.e. left tree is deep. |
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# e.g. '1 + 2 + 3' -> (+ (+ 1 2) 3) -> (+ 1 2 3) |
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simplified = [] |
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x = tree |
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while x[0] == op: |
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281 |
l, r = x[1:] |
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simplified.append(simplifyinfixops(r, targetnodes)) |
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283 |
x = l |
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284 |
simplified.append(simplifyinfixops(x, targetnodes)) |
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285 |
simplified.append(op) |
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286 |
return tuple(reversed(simplified)) |
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287 |
|
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288 |
def parseerrordetail(inst): |
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"""Compose error message from specified ParseError object |
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290 |
""" |
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291 |
if len(inst.args) > 1: |
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292 |
return _('at %d: %s') % (inst.args[1], inst.args[0]) |
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293 |
else: |
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294 |
return inst.args[0] |
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295 |
|
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296 |
class alias(object): |
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297 |
"""Parsed result of alias""" |
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298 |
|
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299 |
def __init__(self, name, args, err, replacement): |
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300 |
self.name = name |
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301 |
self.args = args |
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302 |
self.error = err |
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303 |
self.replacement = replacement |
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304 |
# whether own `error` information is already shown or not. |
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305 |
# this avoids showing same warning multiple times at each |
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306 |
# `expandaliases`. |
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307 |
self.warned = False |
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308 |
|
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309 |
class basealiasrules(object): |
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310 |
"""Parsing and expansion rule set of aliases |
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311 |
|
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312 |
This is a helper for fileset/revset/template aliases. A concrete rule set |
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313 |
should be made by sub-classing this and implementing class/static methods. |
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|
314 |
|
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spelling: fixes of non-dictionary words
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|
315 |
It supports alias expansion of symbol and function-call styles:: |
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|
316 |
|
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317 |
# decl = defn |
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318 |
h = heads(default) |
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319 |
b($1) = ancestors($1) - ancestors(default) |
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320 |
""" |
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321 |
# typically a config section, which will be included in error messages |
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322 |
_section = None |
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323 |
# tag of symbol node |
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324 |
_symbolnode = 'symbol' |
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|
325 |
|
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|
326 |
def __new__(cls): |
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327 |
raise TypeError("'%s' is not instantiatable" % cls.__name__) |
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|
328 |
|
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|
329 |
@staticmethod |
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|
330 |
def _parse(spec): |
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331 |
"""Parse an alias name, arguments and definition""" |
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332 |
raise NotImplementedError |
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|
333 |
|
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|
334 |
@staticmethod |
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335 |
def _trygetfunc(tree): |
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|
336 |
"""Return (name, args) if tree is a function; otherwise None""" |
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337 |
raise NotImplementedError |
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|
338 |
|
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|
339 |
@classmethod |
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|
340 |
def _builddecl(cls, decl): |
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341 |
"""Parse an alias declaration into ``(name, args, errorstr)`` |
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|
342 |
|
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|
343 |
This function analyzes the parsed tree. The parsing rule is provided |
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344 |
by ``_parse()``. |
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|
345 |
|
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|
346 |
- ``name``: of declared alias (may be ``decl`` itself at error) |
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347 |
- ``args``: list of argument names (or None for symbol declaration) |
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348 |
- ``errorstr``: detail about detected error (or None) |
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|
349 |
|
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350 |
>>> sym = lambda x: ('symbol', x) |
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|
351 |
>>> symlist = lambda *xs: ('list',) + tuple(sym(x) for x in xs) |
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352 |
>>> func = lambda n, a: ('func', sym(n), a) |
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|
353 |
>>> parsemap = { |
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|
354 |
... 'foo': sym('foo'), |
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|
355 |
... '$foo': sym('$foo'), |
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|
356 |
... 'foo::bar': ('dagrange', sym('foo'), sym('bar')), |
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|
357 |
... 'foo()': func('foo', None), |
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|
358 |
... '$foo()': func('$foo', None), |
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|
359 |
... 'foo($1, $2)': func('foo', symlist('$1', '$2')), |
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diff
changeset
|
360 |
... 'foo(bar_bar, baz.baz)': |
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|
361 |
... func('foo', symlist('bar_bar', 'baz.baz')), |
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changeset
|
362 |
... 'foo(bar($1, $2))': |
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|
363 |
... func('foo', func('bar', symlist('$1', '$2'))), |
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changeset
|
364 |
... 'foo($1, $2, nested($1, $2))': |
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diff
changeset
|
365 |
... func('foo', (symlist('$1', '$2') + |
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|
366 |
... (func('nested', symlist('$1', '$2')),))), |
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|
367 |
... 'foo("bar")': func('foo', ('string', 'bar')), |
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parser: move alias declaration parser to common rule-set class
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changeset
|
368 |
... 'foo($1, $2': error.ParseError('unexpected token: end', 10), |
6d6201fc5aae
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diff
changeset
|
369 |
... 'foo("bar': error.ParseError('unterminated string', 5), |
6d6201fc5aae
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diff
changeset
|
370 |
... 'foo($1, $2, $1)': func('foo', symlist('$1', '$2', '$1')), |
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|
371 |
... } |
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changeset
|
372 |
>>> def parse(expr): |
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|
373 |
... x = parsemap[expr] |
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|
374 |
... if isinstance(x, Exception): |
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|
375 |
... raise x |
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|
376 |
... return x |
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diff
changeset
|
377 |
>>> def trygetfunc(tree): |
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diff
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|
378 |
... if not tree or tree[0] != 'func' or tree[1][0] != 'symbol': |
1203159c8928
parser: factor out _trygetfunc() that extracts function name and arguments
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changeset
|
379 |
... return None |
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diff
changeset
|
380 |
... if not tree[2]: |
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changeset
|
381 |
... return tree[1][1], [] |
1203159c8928
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parents:
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changeset
|
382 |
... if tree[2][0] == 'list': |
1203159c8928
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diff
changeset
|
383 |
... return tree[1][1], list(tree[2][1:]) |
1203159c8928
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changeset
|
384 |
... return tree[1][1], [tree[2]] |
28871
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|
385 |
>>> class aliasrules(basealiasrules): |
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|
386 |
... _parse = staticmethod(parse) |
28910
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diff
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|
387 |
... _trygetfunc = staticmethod(trygetfunc) |
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|
388 |
>>> builddecl = aliasrules._builddecl |
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changeset
|
389 |
>>> builddecl('foo') |
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diff
changeset
|
390 |
('foo', None, None) |
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changeset
|
391 |
>>> builddecl('$foo') |
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changeset
|
392 |
('$foo', None, "invalid symbol '$foo'") |
28871
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changeset
|
393 |
>>> builddecl('foo::bar') |
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changeset
|
394 |
('foo::bar', None, 'invalid format') |
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diff
changeset
|
395 |
>>> builddecl('foo()') |
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diff
changeset
|
396 |
('foo', [], None) |
28871
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diff
changeset
|
397 |
>>> builddecl('$foo()') |
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diff
changeset
|
398 |
('$foo()', None, "invalid function '$foo'") |
28871
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diff
changeset
|
399 |
>>> builddecl('foo($1, $2)') |
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diff
changeset
|
400 |
('foo', ['$1', '$2'], None) |
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changeset
|
401 |
>>> builddecl('foo(bar_bar, baz.baz)') |
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diff
changeset
|
402 |
('foo', ['bar_bar', 'baz.baz'], None) |
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changeset
|
403 |
>>> builddecl('foo($1, $2, nested($1, $2))') |
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parents:
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diff
changeset
|
404 |
('foo($1, $2, nested($1, $2))', None, 'invalid argument list') |
28871
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changeset
|
405 |
>>> builddecl('foo(bar($1, $2))') |
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diff
changeset
|
406 |
('foo(bar($1, $2))', None, 'invalid argument list') |
28871
6d6201fc5aae
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changeset
|
407 |
>>> builddecl('foo("bar")') |
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changeset
|
408 |
('foo("bar")', None, 'invalid argument list') |
28871
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diff
changeset
|
409 |
>>> builddecl('foo($1, $2') |
28908
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diff
changeset
|
410 |
('foo($1, $2', None, 'at 10: unexpected token: end') |
28871
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diff
changeset
|
411 |
>>> builddecl('foo("bar') |
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parents:
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diff
changeset
|
412 |
('foo("bar', None, 'at 5: unterminated string') |
28871
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diff
changeset
|
413 |
>>> builddecl('foo($1, $2, $1)') |
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parents:
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diff
changeset
|
414 |
('foo', None, 'argument names collide with each other') |
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diff
changeset
|
415 |
""" |
6d6201fc5aae
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diff
changeset
|
416 |
try: |
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diff
changeset
|
417 |
tree = cls._parse(decl) |
28871
6d6201fc5aae
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diff
changeset
|
418 |
except error.ParseError as inst: |
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diff
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|
419 |
return (decl, None, parseerrordetail(inst)) |
28871
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diff
changeset
|
420 |
|
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parser: move alias declaration parser to common rule-set class
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diff
changeset
|
421 |
if tree[0] == cls._symbolnode: |
6d6201fc5aae
parser: move alias declaration parser to common rule-set class
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diff
changeset
|
422 |
# "name = ...." style |
6d6201fc5aae
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diff
changeset
|
423 |
name = tree[1] |
6d6201fc5aae
parser: move alias declaration parser to common rule-set class
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diff
changeset
|
424 |
if name.startswith('$'): |
29058
dbed4c4f48ae
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diff
changeset
|
425 |
return (decl, None, _("invalid symbol '%s'") % name) |
28908
7a772deffa12
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parents:
28898
diff
changeset
|
426 |
return (name, None, None) |
28871
6d6201fc5aae
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diff
changeset
|
427 |
|
28910
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parser: factor out _trygetfunc() that extracts function name and arguments
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diff
changeset
|
428 |
func = cls._trygetfunc(tree) |
1203159c8928
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diff
changeset
|
429 |
if func: |
28871
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diff
changeset
|
430 |
# "name(arg, ....) = ...." style |
28910
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diff
changeset
|
431 |
name, args = func |
28871
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parser: move alias declaration parser to common rule-set class
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diff
changeset
|
432 |
if name.startswith('$'): |
29058
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diff
changeset
|
433 |
return (decl, None, _("invalid function '%s'") % name) |
28910
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parents:
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diff
changeset
|
434 |
if any(t[0] != cls._symbolnode for t in args): |
1203159c8928
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diff
changeset
|
435 |
return (decl, None, _("invalid argument list")) |
28871
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diff
changeset
|
436 |
if len(args) != len(set(args)): |
28908
7a772deffa12
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parents:
28898
diff
changeset
|
437 |
return (name, None, _("argument names collide with each other")) |
28910
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diff
changeset
|
438 |
return (name, [t[1] for t in args], None) |
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diff
changeset
|
439 |
|
28908
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parents:
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diff
changeset
|
440 |
return (decl, None, _("invalid format")) |
28872
5f31d2248745
parser: move _relabelaliasargs() to common rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
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diff
changeset
|
441 |
|
5f31d2248745
parser: move _relabelaliasargs() to common rule-set class
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diff
changeset
|
442 |
@classmethod |
5f31d2248745
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diff
changeset
|
443 |
def _relabelargs(cls, tree, args): |
5f31d2248745
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diff
changeset
|
444 |
"""Mark alias arguments as ``_aliasarg``""" |
5f31d2248745
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diff
changeset
|
445 |
if not isinstance(tree, tuple): |
5f31d2248745
parser: move _relabelaliasargs() to common rule-set class
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diff
changeset
|
446 |
return tree |
5f31d2248745
parser: move _relabelaliasargs() to common rule-set class
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diff
changeset
|
447 |
op = tree[0] |
5f31d2248745
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diff
changeset
|
448 |
if op != cls._symbolnode: |
5f31d2248745
parser: move _relabelaliasargs() to common rule-set class
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diff
changeset
|
449 |
return (op,) + tuple(cls._relabelargs(x, args) for x in tree[1:]) |
5f31d2248745
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diff
changeset
|
450 |
|
5f31d2248745
parser: move _relabelaliasargs() to common rule-set class
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diff
changeset
|
451 |
assert len(tree) == 2 |
5f31d2248745
parser: move _relabelaliasargs() to common rule-set class
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parents:
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diff
changeset
|
452 |
sym = tree[1] |
5f31d2248745
parser: move _relabelaliasargs() to common rule-set class
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parents:
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diff
changeset
|
453 |
if sym in args: |
5f31d2248745
parser: move _relabelaliasargs() to common rule-set class
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parents:
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diff
changeset
|
454 |
op = '_aliasarg' |
5f31d2248745
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parents:
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diff
changeset
|
455 |
elif sym.startswith('$'): |
29058
dbed4c4f48ae
parser: rephrase "'$' not for alias arguments" message
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parents:
28910
diff
changeset
|
456 |
raise error.ParseError(_("invalid symbol '%s'") % sym) |
28872
5f31d2248745
parser: move _relabelaliasargs() to common rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28871
diff
changeset
|
457 |
return (op, sym) |
28873
2ca3b7c563f3
parser: move alias definition parser to common rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28872
diff
changeset
|
458 |
|
2ca3b7c563f3
parser: move alias definition parser to common rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28872
diff
changeset
|
459 |
@classmethod |
2ca3b7c563f3
parser: move alias definition parser to common rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
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diff
changeset
|
460 |
def _builddefn(cls, defn, args): |
2ca3b7c563f3
parser: move alias definition parser to common rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28872
diff
changeset
|
461 |
"""Parse an alias definition into a tree and marks substitutions |
2ca3b7c563f3
parser: move alias definition parser to common rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28872
diff
changeset
|
462 |
|
2ca3b7c563f3
parser: move alias definition parser to common rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28872
diff
changeset
|
463 |
This function marks alias argument references as ``_aliasarg``. The |
28875
2e9f5453ab5a
parser: unify parser function of alias declaration and definition
Yuya Nishihara <yuya@tcha.org>
parents:
28873
diff
changeset
|
464 |
parsing rule is provided by ``_parse()``. |
28873
2ca3b7c563f3
parser: move alias definition parser to common rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28872
diff
changeset
|
465 |
|
2ca3b7c563f3
parser: move alias definition parser to common rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28872
diff
changeset
|
466 |
``args`` is a list of alias argument names, or None if the alias |
2ca3b7c563f3
parser: move alias definition parser to common rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28872
diff
changeset
|
467 |
is declared as a symbol. |
2ca3b7c563f3
parser: move alias definition parser to common rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28872
diff
changeset
|
468 |
|
2ca3b7c563f3
parser: move alias definition parser to common rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28872
diff
changeset
|
469 |
>>> parsemap = { |
2ca3b7c563f3
parser: move alias definition parser to common rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28872
diff
changeset
|
470 |
... '$1 or foo': ('or', ('symbol', '$1'), ('symbol', 'foo')), |
2ca3b7c563f3
parser: move alias definition parser to common rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28872
diff
changeset
|
471 |
... '$1 or $bar': ('or', ('symbol', '$1'), ('symbol', '$bar')), |
2ca3b7c563f3
parser: move alias definition parser to common rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28872
diff
changeset
|
472 |
... '$10 or baz': ('or', ('symbol', '$10'), ('symbol', 'baz')), |
2ca3b7c563f3
parser: move alias definition parser to common rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28872
diff
changeset
|
473 |
... '"$1" or "foo"': ('or', ('string', '$1'), ('string', 'foo')), |
2ca3b7c563f3
parser: move alias definition parser to common rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28872
diff
changeset
|
474 |
... } |
2ca3b7c563f3
parser: move alias definition parser to common rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28872
diff
changeset
|
475 |
>>> class aliasrules(basealiasrules): |
28875
2e9f5453ab5a
parser: unify parser function of alias declaration and definition
Yuya Nishihara <yuya@tcha.org>
parents:
28873
diff
changeset
|
476 |
... _parse = staticmethod(parsemap.__getitem__) |
28910
1203159c8928
parser: factor out _trygetfunc() that extracts function name and arguments
Yuya Nishihara <yuya@tcha.org>
parents:
28909
diff
changeset
|
477 |
... _trygetfunc = staticmethod(lambda x: None) |
28873
2ca3b7c563f3
parser: move alias definition parser to common rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28872
diff
changeset
|
478 |
>>> builddefn = aliasrules._builddefn |
2ca3b7c563f3
parser: move alias definition parser to common rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28872
diff
changeset
|
479 |
>>> def pprint(tree): |
2ca3b7c563f3
parser: move alias definition parser to common rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28872
diff
changeset
|
480 |
... print prettyformat(tree, ('_aliasarg', 'string', 'symbol')) |
2ca3b7c563f3
parser: move alias definition parser to common rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28872
diff
changeset
|
481 |
>>> args = ['$1', '$2', 'foo'] |
2ca3b7c563f3
parser: move alias definition parser to common rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28872
diff
changeset
|
482 |
>>> pprint(builddefn('$1 or foo', args)) |
2ca3b7c563f3
parser: move alias definition parser to common rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28872
diff
changeset
|
483 |
(or |
2ca3b7c563f3
parser: move alias definition parser to common rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28872
diff
changeset
|
484 |
('_aliasarg', '$1') |
2ca3b7c563f3
parser: move alias definition parser to common rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28872
diff
changeset
|
485 |
('_aliasarg', 'foo')) |
2ca3b7c563f3
parser: move alias definition parser to common rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28872
diff
changeset
|
486 |
>>> try: |
2ca3b7c563f3
parser: move alias definition parser to common rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28872
diff
changeset
|
487 |
... builddefn('$1 or $bar', args) |
2ca3b7c563f3
parser: move alias definition parser to common rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28872
diff
changeset
|
488 |
... except error.ParseError as inst: |
2ca3b7c563f3
parser: move alias definition parser to common rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28872
diff
changeset
|
489 |
... print parseerrordetail(inst) |
29058
dbed4c4f48ae
parser: rephrase "'$' not for alias arguments" message
Yuya Nishihara <yuya@tcha.org>
parents:
28910
diff
changeset
|
490 |
invalid symbol '$bar' |
28873
2ca3b7c563f3
parser: move alias definition parser to common rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28872
diff
changeset
|
491 |
>>> args = ['$1', '$10', 'foo'] |
2ca3b7c563f3
parser: move alias definition parser to common rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28872
diff
changeset
|
492 |
>>> pprint(builddefn('$10 or baz', args)) |
2ca3b7c563f3
parser: move alias definition parser to common rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28872
diff
changeset
|
493 |
(or |
2ca3b7c563f3
parser: move alias definition parser to common rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28872
diff
changeset
|
494 |
('_aliasarg', '$10') |
2ca3b7c563f3
parser: move alias definition parser to common rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28872
diff
changeset
|
495 |
('symbol', 'baz')) |
2ca3b7c563f3
parser: move alias definition parser to common rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28872
diff
changeset
|
496 |
>>> pprint(builddefn('"$1" or "foo"', args)) |
2ca3b7c563f3
parser: move alias definition parser to common rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28872
diff
changeset
|
497 |
(or |
2ca3b7c563f3
parser: move alias definition parser to common rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28872
diff
changeset
|
498 |
('string', '$1') |
2ca3b7c563f3
parser: move alias definition parser to common rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28872
diff
changeset
|
499 |
('string', 'foo')) |
2ca3b7c563f3
parser: move alias definition parser to common rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28872
diff
changeset
|
500 |
""" |
28875
2e9f5453ab5a
parser: unify parser function of alias declaration and definition
Yuya Nishihara <yuya@tcha.org>
parents:
28873
diff
changeset
|
501 |
tree = cls._parse(defn) |
28873
2ca3b7c563f3
parser: move alias definition parser to common rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28872
diff
changeset
|
502 |
if args: |
2ca3b7c563f3
parser: move alias definition parser to common rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28872
diff
changeset
|
503 |
args = set(args) |
2ca3b7c563f3
parser: move alias definition parser to common rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28872
diff
changeset
|
504 |
else: |
2ca3b7c563f3
parser: move alias definition parser to common rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28872
diff
changeset
|
505 |
args = set() |
2ca3b7c563f3
parser: move alias definition parser to common rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28872
diff
changeset
|
506 |
return cls._relabelargs(tree, args) |
28892
0c135f37c6f8
parser: construct alias object by rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28875
diff
changeset
|
507 |
|
0c135f37c6f8
parser: construct alias object by rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28875
diff
changeset
|
508 |
@classmethod |
0c135f37c6f8
parser: construct alias object by rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28875
diff
changeset
|
509 |
def build(cls, decl, defn): |
0c135f37c6f8
parser: construct alias object by rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28875
diff
changeset
|
510 |
"""Parse an alias declaration and definition into an alias object""" |
0c135f37c6f8
parser: construct alias object by rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28875
diff
changeset
|
511 |
repl = efmt = None |
28908
7a772deffa12
parser: drop redundant comparison between alias declaration tree and pattern
Yuya Nishihara <yuya@tcha.org>
parents:
28898
diff
changeset
|
512 |
name, args, err = cls._builddecl(decl) |
28892
0c135f37c6f8
parser: construct alias object by rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28875
diff
changeset
|
513 |
if err: |
29059
8eba4cdcfd81
parser: shorten prefix of alias parsing errors
Yuya Nishihara <yuya@tcha.org>
parents:
29058
diff
changeset
|
514 |
efmt = _('bad declaration of %(section)s "%(name)s": %(error)s') |
28892
0c135f37c6f8
parser: construct alias object by rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28875
diff
changeset
|
515 |
else: |
0c135f37c6f8
parser: construct alias object by rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28875
diff
changeset
|
516 |
try: |
0c135f37c6f8
parser: construct alias object by rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28875
diff
changeset
|
517 |
repl = cls._builddefn(defn, args) |
0c135f37c6f8
parser: construct alias object by rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28875
diff
changeset
|
518 |
except error.ParseError as inst: |
0c135f37c6f8
parser: construct alias object by rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28875
diff
changeset
|
519 |
err = parseerrordetail(inst) |
29059
8eba4cdcfd81
parser: shorten prefix of alias parsing errors
Yuya Nishihara <yuya@tcha.org>
parents:
29058
diff
changeset
|
520 |
efmt = _('bad definition of %(section)s "%(name)s": %(error)s') |
28892
0c135f37c6f8
parser: construct alias object by rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28875
diff
changeset
|
521 |
if err: |
0c135f37c6f8
parser: construct alias object by rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28875
diff
changeset
|
522 |
err = efmt % {'section': cls._section, 'name': name, 'error': err} |
28908
7a772deffa12
parser: drop redundant comparison between alias declaration tree and pattern
Yuya Nishihara <yuya@tcha.org>
parents:
28898
diff
changeset
|
523 |
return alias(name, args, err, repl) |
28893
ee11167fe1da
parser: extract helper that creates a dict of aliases
Yuya Nishihara <yuya@tcha.org>
parents:
28892
diff
changeset
|
524 |
|
ee11167fe1da
parser: extract helper that creates a dict of aliases
Yuya Nishihara <yuya@tcha.org>
parents:
28892
diff
changeset
|
525 |
@classmethod |
ee11167fe1da
parser: extract helper that creates a dict of aliases
Yuya Nishihara <yuya@tcha.org>
parents:
28892
diff
changeset
|
526 |
def buildmap(cls, items): |
ee11167fe1da
parser: extract helper that creates a dict of aliases
Yuya Nishihara <yuya@tcha.org>
parents:
28892
diff
changeset
|
527 |
"""Parse a list of alias (name, replacement) pairs into a dict of |
ee11167fe1da
parser: extract helper that creates a dict of aliases
Yuya Nishihara <yuya@tcha.org>
parents:
28892
diff
changeset
|
528 |
alias objects""" |
ee11167fe1da
parser: extract helper that creates a dict of aliases
Yuya Nishihara <yuya@tcha.org>
parents:
28892
diff
changeset
|
529 |
aliases = {} |
ee11167fe1da
parser: extract helper that creates a dict of aliases
Yuya Nishihara <yuya@tcha.org>
parents:
28892
diff
changeset
|
530 |
for decl, defn in items: |
ee11167fe1da
parser: extract helper that creates a dict of aliases
Yuya Nishihara <yuya@tcha.org>
parents:
28892
diff
changeset
|
531 |
a = cls.build(decl, defn) |
ee11167fe1da
parser: extract helper that creates a dict of aliases
Yuya Nishihara <yuya@tcha.org>
parents:
28892
diff
changeset
|
532 |
aliases[a.name] = a |
ee11167fe1da
parser: extract helper that creates a dict of aliases
Yuya Nishihara <yuya@tcha.org>
parents:
28892
diff
changeset
|
533 |
return aliases |
28895
4bf9ed7a260e
parser: move functions that process alias expansion to rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28893
diff
changeset
|
534 |
|
4bf9ed7a260e
parser: move functions that process alias expansion to rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28893
diff
changeset
|
535 |
@classmethod |
4bf9ed7a260e
parser: move functions that process alias expansion to rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28893
diff
changeset
|
536 |
def _getalias(cls, aliases, tree): |
28909
edbffdc7f6a0
parser: make _getalias() return (alias, pattern-args) pair
Yuya Nishihara <yuya@tcha.org>
parents:
28908
diff
changeset
|
537 |
"""If tree looks like an unexpanded alias, return (alias, pattern-args) |
edbffdc7f6a0
parser: make _getalias() return (alias, pattern-args) pair
Yuya Nishihara <yuya@tcha.org>
parents:
28908
diff
changeset
|
538 |
pair. Return None otherwise. |
28895
4bf9ed7a260e
parser: move functions that process alias expansion to rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28893
diff
changeset
|
539 |
""" |
4bf9ed7a260e
parser: move functions that process alias expansion to rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28893
diff
changeset
|
540 |
if not isinstance(tree, tuple): |
4bf9ed7a260e
parser: move functions that process alias expansion to rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28893
diff
changeset
|
541 |
return None |
4bf9ed7a260e
parser: move functions that process alias expansion to rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28893
diff
changeset
|
542 |
if tree[0] == cls._symbolnode: |
4bf9ed7a260e
parser: move functions that process alias expansion to rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28893
diff
changeset
|
543 |
name = tree[1] |
4bf9ed7a260e
parser: move functions that process alias expansion to rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28893
diff
changeset
|
544 |
a = aliases.get(name) |
28908
7a772deffa12
parser: drop redundant comparison between alias declaration tree and pattern
Yuya Nishihara <yuya@tcha.org>
parents:
28898
diff
changeset
|
545 |
if a and a.args is None: |
28909
edbffdc7f6a0
parser: make _getalias() return (alias, pattern-args) pair
Yuya Nishihara <yuya@tcha.org>
parents:
28908
diff
changeset
|
546 |
return a, None |
28910
1203159c8928
parser: factor out _trygetfunc() that extracts function name and arguments
Yuya Nishihara <yuya@tcha.org>
parents:
28909
diff
changeset
|
547 |
func = cls._trygetfunc(tree) |
1203159c8928
parser: factor out _trygetfunc() that extracts function name and arguments
Yuya Nishihara <yuya@tcha.org>
parents:
28909
diff
changeset
|
548 |
if func: |
1203159c8928
parser: factor out _trygetfunc() that extracts function name and arguments
Yuya Nishihara <yuya@tcha.org>
parents:
28909
diff
changeset
|
549 |
name, args = func |
28895
4bf9ed7a260e
parser: move functions that process alias expansion to rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28893
diff
changeset
|
550 |
a = aliases.get(name) |
28908
7a772deffa12
parser: drop redundant comparison between alias declaration tree and pattern
Yuya Nishihara <yuya@tcha.org>
parents:
28898
diff
changeset
|
551 |
if a and a.args is not None: |
28910
1203159c8928
parser: factor out _trygetfunc() that extracts function name and arguments
Yuya Nishihara <yuya@tcha.org>
parents:
28909
diff
changeset
|
552 |
return a, args |
28895
4bf9ed7a260e
parser: move functions that process alias expansion to rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28893
diff
changeset
|
553 |
return None |
4bf9ed7a260e
parser: move functions that process alias expansion to rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28893
diff
changeset
|
554 |
|
4bf9ed7a260e
parser: move functions that process alias expansion to rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28893
diff
changeset
|
555 |
@classmethod |
4bf9ed7a260e
parser: move functions that process alias expansion to rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28893
diff
changeset
|
556 |
def _expandargs(cls, tree, args): |
4bf9ed7a260e
parser: move functions that process alias expansion to rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28893
diff
changeset
|
557 |
"""Replace _aliasarg instances with the substitution value of the |
4bf9ed7a260e
parser: move functions that process alias expansion to rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28893
diff
changeset
|
558 |
same name in args, recursively. |
4bf9ed7a260e
parser: move functions that process alias expansion to rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28893
diff
changeset
|
559 |
""" |
4bf9ed7a260e
parser: move functions that process alias expansion to rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28893
diff
changeset
|
560 |
if not isinstance(tree, tuple): |
4bf9ed7a260e
parser: move functions that process alias expansion to rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28893
diff
changeset
|
561 |
return tree |
4bf9ed7a260e
parser: move functions that process alias expansion to rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28893
diff
changeset
|
562 |
if tree[0] == '_aliasarg': |
4bf9ed7a260e
parser: move functions that process alias expansion to rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28893
diff
changeset
|
563 |
sym = tree[1] |
4bf9ed7a260e
parser: move functions that process alias expansion to rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28893
diff
changeset
|
564 |
return args[sym] |
4bf9ed7a260e
parser: move functions that process alias expansion to rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28893
diff
changeset
|
565 |
return tuple(cls._expandargs(t, args) for t in tree) |
4bf9ed7a260e
parser: move functions that process alias expansion to rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28893
diff
changeset
|
566 |
|
4bf9ed7a260e
parser: move functions that process alias expansion to rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28893
diff
changeset
|
567 |
@classmethod |
4bf9ed7a260e
parser: move functions that process alias expansion to rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28893
diff
changeset
|
568 |
def _expand(cls, aliases, tree, expanding, cache): |
4bf9ed7a260e
parser: move functions that process alias expansion to rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28893
diff
changeset
|
569 |
if not isinstance(tree, tuple): |
4bf9ed7a260e
parser: move functions that process alias expansion to rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28893
diff
changeset
|
570 |
return tree |
28909
edbffdc7f6a0
parser: make _getalias() return (alias, pattern-args) pair
Yuya Nishihara <yuya@tcha.org>
parents:
28908
diff
changeset
|
571 |
r = cls._getalias(aliases, tree) |
edbffdc7f6a0
parser: make _getalias() return (alias, pattern-args) pair
Yuya Nishihara <yuya@tcha.org>
parents:
28908
diff
changeset
|
572 |
if r is None: |
28896
4c76a032ec7e
parser: reorder alias expansion routine to return early
Yuya Nishihara <yuya@tcha.org>
parents:
28895
diff
changeset
|
573 |
return tuple(cls._expand(aliases, t, expanding, cache) |
4c76a032ec7e
parser: reorder alias expansion routine to return early
Yuya Nishihara <yuya@tcha.org>
parents:
28895
diff
changeset
|
574 |
for t in tree) |
28909
edbffdc7f6a0
parser: make _getalias() return (alias, pattern-args) pair
Yuya Nishihara <yuya@tcha.org>
parents:
28908
diff
changeset
|
575 |
a, l = r |
28896
4c76a032ec7e
parser: reorder alias expansion routine to return early
Yuya Nishihara <yuya@tcha.org>
parents:
28895
diff
changeset
|
576 |
if a.error: |
4c76a032ec7e
parser: reorder alias expansion routine to return early
Yuya Nishihara <yuya@tcha.org>
parents:
28895
diff
changeset
|
577 |
raise error.Abort(a.error) |
4c76a032ec7e
parser: reorder alias expansion routine to return early
Yuya Nishihara <yuya@tcha.org>
parents:
28895
diff
changeset
|
578 |
if a in expanding: |
4c76a032ec7e
parser: reorder alias expansion routine to return early
Yuya Nishihara <yuya@tcha.org>
parents:
28895
diff
changeset
|
579 |
raise error.ParseError(_('infinite expansion of %(section)s ' |
4c76a032ec7e
parser: reorder alias expansion routine to return early
Yuya Nishihara <yuya@tcha.org>
parents:
28895
diff
changeset
|
580 |
'"%(name)s" detected') |
4c76a032ec7e
parser: reorder alias expansion routine to return early
Yuya Nishihara <yuya@tcha.org>
parents:
28895
diff
changeset
|
581 |
% {'section': cls._section, 'name': a.name}) |
28897
c1f254138f44
parser: add short comment how aliases are expanded in phases
Yuya Nishihara <yuya@tcha.org>
parents:
28896
diff
changeset
|
582 |
# get cacheable replacement tree by expanding aliases recursively |
28896
4c76a032ec7e
parser: reorder alias expansion routine to return early
Yuya Nishihara <yuya@tcha.org>
parents:
28895
diff
changeset
|
583 |
expanding.append(a) |
4c76a032ec7e
parser: reorder alias expansion routine to return early
Yuya Nishihara <yuya@tcha.org>
parents:
28895
diff
changeset
|
584 |
if a.name not in cache: |
4c76a032ec7e
parser: reorder alias expansion routine to return early
Yuya Nishihara <yuya@tcha.org>
parents:
28895
diff
changeset
|
585 |
cache[a.name] = cls._expand(aliases, a.replacement, expanding, |
4c76a032ec7e
parser: reorder alias expansion routine to return early
Yuya Nishihara <yuya@tcha.org>
parents:
28895
diff
changeset
|
586 |
cache) |
4c76a032ec7e
parser: reorder alias expansion routine to return early
Yuya Nishihara <yuya@tcha.org>
parents:
28895
diff
changeset
|
587 |
result = cache[a.name] |
4c76a032ec7e
parser: reorder alias expansion routine to return early
Yuya Nishihara <yuya@tcha.org>
parents:
28895
diff
changeset
|
588 |
expanding.pop() |
4c76a032ec7e
parser: reorder alias expansion routine to return early
Yuya Nishihara <yuya@tcha.org>
parents:
28895
diff
changeset
|
589 |
if a.args is None: |
4c76a032ec7e
parser: reorder alias expansion routine to return early
Yuya Nishihara <yuya@tcha.org>
parents:
28895
diff
changeset
|
590 |
return result |
28897
c1f254138f44
parser: add short comment how aliases are expanded in phases
Yuya Nishihara <yuya@tcha.org>
parents:
28896
diff
changeset
|
591 |
# substitute function arguments in replacement tree |
28896
4c76a032ec7e
parser: reorder alias expansion routine to return early
Yuya Nishihara <yuya@tcha.org>
parents:
28895
diff
changeset
|
592 |
if len(l) != len(a.args): |
4c76a032ec7e
parser: reorder alias expansion routine to return early
Yuya Nishihara <yuya@tcha.org>
parents:
28895
diff
changeset
|
593 |
raise error.ParseError(_('invalid number of arguments: %d') |
4c76a032ec7e
parser: reorder alias expansion routine to return early
Yuya Nishihara <yuya@tcha.org>
parents:
28895
diff
changeset
|
594 |
% len(l)) |
4c76a032ec7e
parser: reorder alias expansion routine to return early
Yuya Nishihara <yuya@tcha.org>
parents:
28895
diff
changeset
|
595 |
l = [cls._expand(aliases, t, [], cache) for t in l] |
4c76a032ec7e
parser: reorder alias expansion routine to return early
Yuya Nishihara <yuya@tcha.org>
parents:
28895
diff
changeset
|
596 |
return cls._expandargs(result, dict(zip(a.args, l))) |
28895
4bf9ed7a260e
parser: move functions that process alias expansion to rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28893
diff
changeset
|
597 |
|
4bf9ed7a260e
parser: move functions that process alias expansion to rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28893
diff
changeset
|
598 |
@classmethod |
4bf9ed7a260e
parser: move functions that process alias expansion to rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28893
diff
changeset
|
599 |
def expand(cls, aliases, tree): |
4bf9ed7a260e
parser: move functions that process alias expansion to rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28893
diff
changeset
|
600 |
"""Expand aliases in tree, recursively. |
4bf9ed7a260e
parser: move functions that process alias expansion to rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28893
diff
changeset
|
601 |
|
4bf9ed7a260e
parser: move functions that process alias expansion to rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28893
diff
changeset
|
602 |
'aliases' is a dictionary mapping user defined aliases to alias objects. |
4bf9ed7a260e
parser: move functions that process alias expansion to rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28893
diff
changeset
|
603 |
""" |
4bf9ed7a260e
parser: move functions that process alias expansion to rule-set class
Yuya Nishihara <yuya@tcha.org>
parents:
28893
diff
changeset
|
604 |
return cls._expand(aliases, tree, [], {}) |