Mercurial > hg
annotate mercurial/parser.py @ 31920:a98540ea1e42
parser: verify excessive number of args excluding kwargs in buildargsdict()
This makes the next patch slightly simpler. We don't need to check the
excessive number of keyword arguments since unknown and duplicated kwargs
are rejected.
author | Yuya Nishihara <yuya@tcha.org> |
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date | Sat, 08 Apr 2017 20:07:37 +0900 |
parents | afb335353d28 |
children | 2156934b7917 |
rev | line source |
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11274 | 1 # parser.py - simple top-down operator precedence parser for mercurial |
2 # | |
3 # Copyright 2010 Matt Mackall <mpm@selenic.com> | |
4 # | |
5 # This software may be used and distributed according to the terms of the | |
6 # GNU General Public License version 2 or any later version. | |
7 | |
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8 # see http://effbot.org/zone/simple-top-down-parsing.htm and |
11274 | 9 # http://eli.thegreenplace.net/2010/01/02/top-down-operator-precedence-parsing/ |
10 # for background | |
11 | |
12 # takes a tokenizer and elements | |
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13 # tokenizer is an iterator that returns (type, value, pos) tuples |
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14 # elements is a mapping of types to binding strength, primary, prefix, infix |
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15 # and suffix actions |
11274 | 16 # an action is a tree node name, a tree label, and an optional match |
17500 | 17 # __call__(program) parses program into a labeled tree |
11274 | 18 |
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19 from __future__ import absolute_import |
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20 |
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21 from .i18n import _ |
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22 from . import ( |
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23 error, |
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24 util, |
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25 ) |
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26 |
11274 | 27 class parser(object): |
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28 def __init__(self, elements, methods=None): |
11274 | 29 self._elements = elements |
30 self._methods = methods | |
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31 self.current = None |
11274 | 32 def _advance(self): |
33 'advance the tokenizer' | |
34 t = self.current | |
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35 self.current = next(self._iter, None) |
11274 | 36 return t |
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37 def _hasnewterm(self): |
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38 'True if next token may start new term' |
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39 return any(self._elements[self.current[0]][1:3]) |
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40 def _match(self, m): |
11274 | 41 'make sure the tokenizer matches an end condition' |
42 if self.current[0] != m: | |
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43 raise error.ParseError(_("unexpected token: %s") % self.current[0], |
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44 self.current[2]) |
11274 | 45 self._advance() |
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46 def _parseoperand(self, bind, m=None): |
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47 'gather right-hand-side operand until an end condition or binding met' |
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48 if m and self.current[0] == m: |
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49 expr = None |
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50 else: |
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51 expr = self._parse(bind) |
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52 if m: |
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53 self._match(m) |
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54 return expr |
11274 | 55 def _parse(self, bind=0): |
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56 token, value, pos = self._advance() |
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57 # handle prefix rules on current token, take as primary if unambiguous |
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58 primary, prefix = self._elements[token][1:3] |
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59 if primary and not (prefix and self._hasnewterm()): |
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60 expr = (primary, value) |
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61 elif prefix: |
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62 expr = (prefix[0], self._parseoperand(*prefix[1:])) |
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63 else: |
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64 raise error.ParseError(_("not a prefix: %s") % token, pos) |
11274 | 65 # gather tokens until we meet a lower binding strength |
66 while bind < self._elements[self.current[0]][0]: | |
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67 token, value, pos = self._advance() |
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68 # handle infix rules, take as suffix if unambiguous |
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69 infix, suffix = self._elements[token][3:] |
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70 if suffix and not (infix and self._hasnewterm()): |
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71 expr = (suffix, expr) |
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72 elif infix: |
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73 expr = (infix[0], expr, self._parseoperand(*infix[1:])) |
11274 | 74 else: |
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75 raise error.ParseError(_("not an infix: %s") % token, pos) |
11274 | 76 return expr |
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77 def parse(self, tokeniter): |
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78 'generate a parse tree from tokens' |
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79 self._iter = tokeniter |
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80 self._advance() |
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81 res = self._parse() |
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82 token, value, pos = self.current |
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83 return res, pos |
11274 | 84 def eval(self, tree): |
85 'recursively evaluate a parse tree using node methods' | |
86 if not isinstance(tree, tuple): | |
87 return tree | |
88 return self._methods[tree[0]](*[self.eval(t) for t in tree[1:]]) | |
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89 def __call__(self, tokeniter): |
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90 'parse tokens into a parse tree and evaluate if methods given' |
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91 t = self.parse(tokeniter) |
11274 | 92 if self._methods: |
93 return self.eval(t) | |
94 return t | |
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95 |
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96 def splitargspec(spec): |
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97 """Parse spec of function arguments into (poskeys, varkey, keys) |
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98 |
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99 >>> splitargspec('') |
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100 ([], None, []) |
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101 >>> splitargspec('foo bar') |
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102 ([], None, ['foo', 'bar']) |
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103 >>> splitargspec('foo *bar baz') |
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104 (['foo'], 'bar', ['baz']) |
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105 >>> splitargspec('*foo') |
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106 ([], 'foo', []) |
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107 """ |
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108 pre, sep, post = spec.partition('*') |
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109 pres = pre.split() |
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110 posts = post.split() |
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111 if sep: |
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112 if not posts: |
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113 raise error.ProgrammingError('no *varkey name provided') |
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114 return pres, posts[0], posts[1:] |
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115 return [], None, pres |
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116 |
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117 def buildargsdict(trees, funcname, argspec, keyvaluenode, keynode): |
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118 """Build dict from list containing positional and keyword arguments |
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119 |
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120 Arguments are specified by a tuple of ``(poskeys, varkey, keys)`` where |
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121 |
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122 - ``poskeys``: list of names of positional arguments |
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123 - ``varkey``: optional argument name that takes up remainder |
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124 - ``keys``: list of names that can be either positional or keyword arguments |
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125 |
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126 If ``varkey`` specified, all ``keys`` must be given as keyword arguments. |
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127 |
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128 Invalid keywords, too few positional arguments, or too many positional |
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129 arguments are rejected, but missing keyword arguments are just omitted. |
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130 """ |
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131 poskeys, varkey, keys = argspec |
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132 kwstart = next((i for i, x in enumerate(trees) if x[0] == keyvaluenode), |
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133 len(trees)) |
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134 if kwstart < len(poskeys): |
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135 raise error.ParseError(_("%(func)s takes at least %(nargs)d positional " |
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136 "arguments") |
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137 % {'func': funcname, 'nargs': len(poskeys)}) |
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138 if not varkey and kwstart > len(poskeys) + len(keys): |
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139 raise error.ParseError(_("%(func)s takes at most %(nargs)d positional " |
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140 "arguments") |
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141 % {'func': funcname, |
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142 'nargs': len(poskeys) + len(keys)}) |
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143 args = {} |
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144 # consume positional arguments |
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145 for k, x in zip(poskeys, trees[:kwstart]): |
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146 args[k] = x |
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147 if varkey: |
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148 args[varkey] = trees[len(args):kwstart] |
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149 else: |
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150 for k, x in zip(keys, trees[len(args):kwstart]): |
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151 args[k] = x |
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152 # remainder should be keyword arguments |
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153 for x in trees[kwstart:]: |
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154 if x[0] != keyvaluenode or x[1][0] != keynode: |
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155 raise error.ParseError(_("%(func)s got an invalid argument") |
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156 % {'func': funcname}) |
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157 k = x[1][1] |
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158 if k not in keys: |
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159 raise error.ParseError(_("%(func)s got an unexpected keyword " |
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160 "argument '%(key)s'") |
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161 % {'func': funcname, 'key': k}) |
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162 if k in args: |
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163 raise error.ParseError(_("%(func)s got multiple values for keyword " |
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164 "argument '%(key)s'") |
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165 % {'func': funcname, 'key': k}) |
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166 args[k] = x[2] |
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167 return args |
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168 |
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169 def unescapestr(s): |
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170 try: |
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171 return util.unescapestr(s) |
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172 except ValueError as e: |
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173 # mangle Python's exception into our format |
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174 raise error.ParseError(str(e).lower()) |
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175 |
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176 def _prettyformat(tree, leafnodes, level, lines): |
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177 if not isinstance(tree, tuple) or tree[0] in leafnodes: |
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178 lines.append((level, str(tree))) |
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179 else: |
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180 lines.append((level, '(%s' % tree[0])) |
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181 for s in tree[1:]: |
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182 _prettyformat(s, leafnodes, level + 1, lines) |
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183 lines[-1:] = [(lines[-1][0], lines[-1][1] + ')')] |
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184 |
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185 def prettyformat(tree, leafnodes): |
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186 lines = [] |
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187 _prettyformat(tree, leafnodes, 0, lines) |
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188 output = '\n'.join((' ' * l + s) for l, s in lines) |
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189 return output |
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190 |
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191 def simplifyinfixops(tree, targetnodes): |
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192 """Flatten chained infix operations to reduce usage of Python stack |
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193 |
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194 >>> def f(tree): |
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195 ... print prettyformat(simplifyinfixops(tree, ('or',)), ('symbol',)) |
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196 >>> f(('or', |
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197 ... ('or', |
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198 ... ('symbol', '1'), |
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199 ... ('symbol', '2')), |
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200 ... ('symbol', '3'))) |
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201 (or |
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202 ('symbol', '1') |
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203 ('symbol', '2') |
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204 ('symbol', '3')) |
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205 >>> f(('func', |
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206 ... ('symbol', 'p1'), |
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207 ... ('or', |
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208 ... ('or', |
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209 ... ('func', |
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210 ... ('symbol', 'sort'), |
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211 ... ('list', |
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212 ... ('or', |
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213 ... ('or', |
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214 ... ('symbol', '1'), |
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215 ... ('symbol', '2')), |
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216 ... ('symbol', '3')), |
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217 ... ('negate', |
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218 ... ('symbol', 'rev')))), |
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219 ... ('and', |
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220 ... ('symbol', '4'), |
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221 ... ('group', |
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222 ... ('or', |
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223 ... ('or', |
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224 ... ('symbol', '5'), |
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225 ... ('symbol', '6')), |
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226 ... ('symbol', '7'))))), |
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227 ... ('symbol', '8')))) |
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228 (func |
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229 ('symbol', 'p1') |
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230 (or |
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231 (func |
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232 ('symbol', 'sort') |
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233 (list |
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234 (or |
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235 ('symbol', '1') |
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236 ('symbol', '2') |
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237 ('symbol', '3')) |
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238 (negate |
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239 ('symbol', 'rev')))) |
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240 (and |
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241 ('symbol', '4') |
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242 (group |
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243 (or |
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244 ('symbol', '5') |
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245 ('symbol', '6') |
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246 ('symbol', '7')))) |
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247 ('symbol', '8'))) |
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248 """ |
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249 if not isinstance(tree, tuple): |
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250 return tree |
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251 op = tree[0] |
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252 if op not in targetnodes: |
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253 return (op,) + tuple(simplifyinfixops(x, targetnodes) for x in tree[1:]) |
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254 |
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255 # walk down left nodes taking each right node. no recursion to left nodes |
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256 # because infix operators are left-associative, i.e. left tree is deep. |
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257 # e.g. '1 + 2 + 3' -> (+ (+ 1 2) 3) -> (+ 1 2 3) |
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258 simplified = [] |
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259 x = tree |
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260 while x[0] == op: |
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261 l, r = x[1:] |
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262 simplified.append(simplifyinfixops(r, targetnodes)) |
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263 x = l |
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264 simplified.append(simplifyinfixops(x, targetnodes)) |
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265 simplified.append(op) |
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266 return tuple(reversed(simplified)) |
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267 |
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268 def parseerrordetail(inst): |
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269 """Compose error message from specified ParseError object |
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270 """ |
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271 if len(inst.args) > 1: |
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272 return _('at %d: %s') % (inst.args[1], inst.args[0]) |
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273 else: |
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274 return inst.args[0] |
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275 |
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276 class alias(object): |
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277 """Parsed result of alias""" |
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278 |
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279 def __init__(self, name, args, err, replacement): |
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280 self.name = name |
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281 self.args = args |
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282 self.error = err |
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283 self.replacement = replacement |
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284 # whether own `error` information is already shown or not. |
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285 # this avoids showing same warning multiple times at each |
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286 # `expandaliases`. |
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287 self.warned = False |
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288 |
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289 class basealiasrules(object): |
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290 """Parsing and expansion rule set of aliases |
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291 |
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292 This is a helper for fileset/revset/template aliases. A concrete rule set |
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293 should be made by sub-classing this and implementing class/static methods. |
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294 |
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295 It supports alias expansion of symbol and function-call styles:: |
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296 |
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297 # decl = defn |
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298 h = heads(default) |
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299 b($1) = ancestors($1) - ancestors(default) |
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300 """ |
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301 # typically a config section, which will be included in error messages |
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302 _section = None |
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303 # tag of symbol node |
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304 _symbolnode = 'symbol' |
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305 |
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306 def __new__(cls): |
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307 raise TypeError("'%s' is not instantiatable" % cls.__name__) |
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308 |
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309 @staticmethod |
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310 def _parse(spec): |
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311 """Parse an alias name, arguments and definition""" |
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312 raise NotImplementedError |
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313 |
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314 @staticmethod |
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315 def _trygetfunc(tree): |
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316 """Return (name, args) if tree is a function; otherwise None""" |
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317 raise NotImplementedError |
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318 |
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319 @classmethod |
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320 def _builddecl(cls, decl): |
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321 """Parse an alias declaration into ``(name, args, errorstr)`` |
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322 |
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323 This function analyzes the parsed tree. The parsing rule is provided |
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324 by ``_parse()``. |
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325 |
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326 - ``name``: of declared alias (may be ``decl`` itself at error) |
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327 - ``args``: list of argument names (or None for symbol declaration) |
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328 - ``errorstr``: detail about detected error (or None) |
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329 |
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330 >>> sym = lambda x: ('symbol', x) |
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331 >>> symlist = lambda *xs: ('list',) + tuple(sym(x) for x in xs) |
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332 >>> func = lambda n, a: ('func', sym(n), a) |
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333 >>> parsemap = { |
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334 ... 'foo': sym('foo'), |
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335 ... '$foo': sym('$foo'), |
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336 ... 'foo::bar': ('dagrange', sym('foo'), sym('bar')), |
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337 ... 'foo()': func('foo', None), |
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338 ... '$foo()': func('$foo', None), |
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339 ... 'foo($1, $2)': func('foo', symlist('$1', '$2')), |
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340 ... 'foo(bar_bar, baz.baz)': |
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341 ... func('foo', symlist('bar_bar', 'baz.baz')), |
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342 ... 'foo(bar($1, $2))': |
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343 ... func('foo', func('bar', symlist('$1', '$2'))), |
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344 ... 'foo($1, $2, nested($1, $2))': |
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345 ... func('foo', (symlist('$1', '$2') + |
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346 ... (func('nested', symlist('$1', '$2')),))), |
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347 ... 'foo("bar")': func('foo', ('string', 'bar')), |
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348 ... 'foo($1, $2': error.ParseError('unexpected token: end', 10), |
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349 ... 'foo("bar': error.ParseError('unterminated string', 5), |
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350 ... 'foo($1, $2, $1)': func('foo', symlist('$1', '$2', '$1')), |
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351 ... } |
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352 >>> def parse(expr): |
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353 ... x = parsemap[expr] |
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354 ... if isinstance(x, Exception): |
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355 ... raise x |
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356 ... return x |
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357 >>> def trygetfunc(tree): |
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358 ... if not tree or tree[0] != 'func' or tree[1][0] != 'symbol': |
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359 ... return None |
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360 ... if not tree[2]: |
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361 ... return tree[1][1], [] |
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362 ... if tree[2][0] == 'list': |
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363 ... return tree[1][1], list(tree[2][1:]) |
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364 ... return tree[1][1], [tree[2]] |
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365 >>> class aliasrules(basealiasrules): |
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366 ... _parse = staticmethod(parse) |
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367 ... _trygetfunc = staticmethod(trygetfunc) |
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368 >>> builddecl = aliasrules._builddecl |
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369 >>> builddecl('foo') |
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370 ('foo', None, None) |
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371 >>> builddecl('$foo') |
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372 ('$foo', None, "invalid symbol '$foo'") |
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373 >>> builddecl('foo::bar') |
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374 ('foo::bar', None, 'invalid format') |
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375 >>> builddecl('foo()') |
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376 ('foo', [], None) |
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377 >>> builddecl('$foo()') |
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378 ('$foo()', None, "invalid function '$foo'") |
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379 >>> builddecl('foo($1, $2)') |
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380 ('foo', ['$1', '$2'], None) |
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381 >>> builddecl('foo(bar_bar, baz.baz)') |
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382 ('foo', ['bar_bar', 'baz.baz'], None) |
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383 >>> builddecl('foo($1, $2, nested($1, $2))') |
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384 ('foo($1, $2, nested($1, $2))', None, 'invalid argument list') |
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385 >>> builddecl('foo(bar($1, $2))') |
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386 ('foo(bar($1, $2))', None, 'invalid argument list') |
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387 >>> builddecl('foo("bar")') |
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388 ('foo("bar")', None, 'invalid argument list') |
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389 >>> builddecl('foo($1, $2') |
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390 ('foo($1, $2', None, 'at 10: unexpected token: end') |
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391 >>> builddecl('foo("bar') |
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392 ('foo("bar', None, 'at 5: unterminated string') |
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393 >>> builddecl('foo($1, $2, $1)') |
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394 ('foo', None, 'argument names collide with each other') |
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395 """ |
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396 try: |
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397 tree = cls._parse(decl) |
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398 except error.ParseError as inst: |
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399 return (decl, None, parseerrordetail(inst)) |
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400 |
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401 if tree[0] == cls._symbolnode: |
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402 # "name = ...." style |
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403 name = tree[1] |
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404 if name.startswith('$'): |
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405 return (decl, None, _("invalid symbol '%s'") % name) |
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406 return (name, None, None) |
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407 |
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408 func = cls._trygetfunc(tree) |
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409 if func: |
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410 # "name(arg, ....) = ...." style |
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411 name, args = func |
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412 if name.startswith('$'): |
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413 return (decl, None, _("invalid function '%s'") % name) |
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414 if any(t[0] != cls._symbolnode for t in args): |
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415 return (decl, None, _("invalid argument list")) |
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416 if len(args) != len(set(args)): |
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417 return (name, None, _("argument names collide with each other")) |
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418 return (name, [t[1] for t in args], None) |
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419 |
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420 return (decl, None, _("invalid format")) |
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421 |
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422 @classmethod |
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423 def _relabelargs(cls, tree, args): |
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424 """Mark alias arguments as ``_aliasarg``""" |
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425 if not isinstance(tree, tuple): |
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426 return tree |
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427 op = tree[0] |
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428 if op != cls._symbolnode: |
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429 return (op,) + tuple(cls._relabelargs(x, args) for x in tree[1:]) |
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430 |
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431 assert len(tree) == 2 |
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432 sym = tree[1] |
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433 if sym in args: |
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434 op = '_aliasarg' |
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435 elif sym.startswith('$'): |
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436 raise error.ParseError(_("invalid symbol '%s'") % sym) |
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437 return (op, sym) |
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438 |
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439 @classmethod |
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440 def _builddefn(cls, defn, args): |
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441 """Parse an alias definition into a tree and marks substitutions |
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442 |
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443 This function marks alias argument references as ``_aliasarg``. The |
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444 parsing rule is provided by ``_parse()``. |
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445 |
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446 ``args`` is a list of alias argument names, or None if the alias |
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447 is declared as a symbol. |
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448 |
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449 >>> parsemap = { |
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450 ... '$1 or foo': ('or', ('symbol', '$1'), ('symbol', 'foo')), |
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451 ... '$1 or $bar': ('or', ('symbol', '$1'), ('symbol', '$bar')), |
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452 ... '$10 or baz': ('or', ('symbol', '$10'), ('symbol', 'baz')), |
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453 ... '"$1" or "foo"': ('or', ('string', '$1'), ('string', 'foo')), |
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454 ... } |
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455 >>> class aliasrules(basealiasrules): |
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456 ... _parse = staticmethod(parsemap.__getitem__) |
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457 ... _trygetfunc = staticmethod(lambda x: None) |
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458 >>> builddefn = aliasrules._builddefn |
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459 >>> def pprint(tree): |
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460 ... print prettyformat(tree, ('_aliasarg', 'string', 'symbol')) |
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461 >>> args = ['$1', '$2', 'foo'] |
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462 >>> pprint(builddefn('$1 or foo', args)) |
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463 (or |
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464 ('_aliasarg', '$1') |
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465 ('_aliasarg', 'foo')) |
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466 >>> try: |
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467 ... builddefn('$1 or $bar', args) |
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468 ... except error.ParseError as inst: |
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469 ... print parseerrordetail(inst) |
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470 invalid symbol '$bar' |
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471 >>> args = ['$1', '$10', 'foo'] |
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472 >>> pprint(builddefn('$10 or baz', args)) |
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473 (or |
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474 ('_aliasarg', '$10') |
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475 ('symbol', 'baz')) |
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476 >>> pprint(builddefn('"$1" or "foo"', args)) |
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477 (or |
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478 ('string', '$1') |
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479 ('string', 'foo')) |
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480 """ |
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481 tree = cls._parse(defn) |
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482 if args: |
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483 args = set(args) |
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484 else: |
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485 args = set() |
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486 return cls._relabelargs(tree, args) |
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487 |
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488 @classmethod |
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489 def build(cls, decl, defn): |
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490 """Parse an alias declaration and definition into an alias object""" |
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491 repl = efmt = None |
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492 name, args, err = cls._builddecl(decl) |
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493 if err: |
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494 efmt = _('bad declaration of %(section)s "%(name)s": %(error)s') |
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495 else: |
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496 try: |
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497 repl = cls._builddefn(defn, args) |
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498 except error.ParseError as inst: |
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499 err = parseerrordetail(inst) |
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500 efmt = _('bad definition of %(section)s "%(name)s": %(error)s') |
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501 if err: |
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502 err = efmt % {'section': cls._section, 'name': name, 'error': err} |
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503 return alias(name, args, err, repl) |
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504 |
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505 @classmethod |
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506 def buildmap(cls, items): |
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507 """Parse a list of alias (name, replacement) pairs into a dict of |
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508 alias objects""" |
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509 aliases = {} |
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510 for decl, defn in items: |
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511 a = cls.build(decl, defn) |
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512 aliases[a.name] = a |
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513 return aliases |
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514 |
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515 @classmethod |
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516 def _getalias(cls, aliases, tree): |
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517 """If tree looks like an unexpanded alias, return (alias, pattern-args) |
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518 pair. Return None otherwise. |
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519 """ |
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520 if not isinstance(tree, tuple): |
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521 return None |
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522 if tree[0] == cls._symbolnode: |
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523 name = tree[1] |
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524 a = aliases.get(name) |
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525 if a and a.args is None: |
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526 return a, None |
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527 func = cls._trygetfunc(tree) |
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528 if func: |
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529 name, args = func |
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530 a = aliases.get(name) |
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531 if a and a.args is not None: |
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532 return a, args |
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533 return None |
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534 |
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535 @classmethod |
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536 def _expandargs(cls, tree, args): |
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537 """Replace _aliasarg instances with the substitution value of the |
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538 same name in args, recursively. |
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539 """ |
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540 if not isinstance(tree, tuple): |
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541 return tree |
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542 if tree[0] == '_aliasarg': |
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543 sym = tree[1] |
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544 return args[sym] |
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545 return tuple(cls._expandargs(t, args) for t in tree) |
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546 |
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547 @classmethod |
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548 def _expand(cls, aliases, tree, expanding, cache): |
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549 if not isinstance(tree, tuple): |
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550 return tree |
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551 r = cls._getalias(aliases, tree) |
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552 if r is None: |
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553 return tuple(cls._expand(aliases, t, expanding, cache) |
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554 for t in tree) |
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555 a, l = r |
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556 if a.error: |
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557 raise error.Abort(a.error) |
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558 if a in expanding: |
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559 raise error.ParseError(_('infinite expansion of %(section)s ' |
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|
560 '"%(name)s" detected') |
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561 % {'section': cls._section, 'name': a.name}) |
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562 # get cacheable replacement tree by expanding aliases recursively |
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563 expanding.append(a) |
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564 if a.name not in cache: |
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565 cache[a.name] = cls._expand(aliases, a.replacement, expanding, |
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566 cache) |
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567 result = cache[a.name] |
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568 expanding.pop() |
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569 if a.args is None: |
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570 return result |
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571 # substitute function arguments in replacement tree |
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572 if len(l) != len(a.args): |
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573 raise error.ParseError(_('invalid number of arguments: %d') |
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574 % len(l)) |
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575 l = [cls._expand(aliases, t, [], cache) for t in l] |
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576 return cls._expandargs(result, dict(zip(a.args, l))) |
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577 |
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|
578 @classmethod |
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579 def expand(cls, aliases, tree): |
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580 """Expand aliases in tree, recursively. |
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581 |
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582 'aliases' is a dictionary mapping user defined aliases to alias objects. |
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|
583 """ |
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584 return cls._expand(aliases, tree, [], {}) |