Mercurial > hg
annotate mercurial/parser.py @ 48365:67064c238ae7
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Differential Revision: https://phab.mercurial-scm.org/D11826
author | Martin von Zweigbergk <martinvonz@google.com> |
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date | Fri, 19 Nov 2021 15:38:36 -0800 |
parents | 8655a77dce94 |
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11274 | 1 # parser.py - simple top-down operator precedence parser for mercurial |
2 # | |
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3 # Copyright 2010 Olivia Mackall <olivia@selenic.com> |
11274 | 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, print_function |
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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 from .utils import stringutil |
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27 |
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28 |
11274 | 29 class parser(object): |
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30 def __init__(self, elements, methods=None): |
11274 | 31 self._elements = elements |
32 self._methods = methods | |
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33 self.current = None |
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34 |
11274 | 35 def _advance(self): |
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36 """advance the tokenizer""" |
11274 | 37 t = self.current |
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38 self.current = next(self._iter, None) |
11274 | 39 return t |
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40 |
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41 def _hasnewterm(self): |
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42 """True if next token may start new term""" |
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43 return any(self._elements[self.current[0]][1:3]) |
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44 |
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45 def _match(self, m): |
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46 """make sure the tokenizer matches an end condition""" |
11274 | 47 if self.current[0] != m: |
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48 raise error.ParseError( |
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49 _(b"unexpected token: %s") % self.current[0], self.current[2] |
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50 ) |
11274 | 51 self._advance() |
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52 |
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53 def _parseoperand(self, bind, m=None): |
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54 """gather right-hand-side operand until an end condition or binding |
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55 met""" |
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56 if m and self.current[0] == m: |
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57 expr = None |
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58 else: |
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59 expr = self._parse(bind) |
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60 if m: |
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61 self._match(m) |
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62 return expr |
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63 |
11274 | 64 def _parse(self, bind=0): |
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65 token, value, pos = self._advance() |
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66 # handle prefix rules on current token, take as primary if unambiguous |
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67 primary, prefix = self._elements[token][1:3] |
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68 if primary and not (prefix and self._hasnewterm()): |
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69 expr = (primary, value) |
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70 elif prefix: |
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71 expr = (prefix[0], self._parseoperand(*prefix[1:])) |
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72 else: |
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73 raise error.ParseError(_(b"not a prefix: %s") % token, pos) |
11274 | 74 # gather tokens until we meet a lower binding strength |
75 while bind < self._elements[self.current[0]][0]: | |
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76 token, value, pos = self._advance() |
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77 # handle infix rules, take as suffix if unambiguous |
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78 infix, suffix = self._elements[token][3:] |
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79 if suffix and not (infix and self._hasnewterm()): |
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80 expr = (suffix, expr) |
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81 elif infix: |
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82 expr = (infix[0], expr, self._parseoperand(*infix[1:])) |
11274 | 83 else: |
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84 raise error.ParseError(_(b"not an infix: %s") % token, pos) |
11274 | 85 return expr |
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86 |
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87 def parse(self, tokeniter): |
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88 """generate a parse tree from tokens""" |
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89 self._iter = tokeniter |
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90 self._advance() |
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91 res = self._parse() |
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92 token, value, pos = self.current |
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93 return res, pos |
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94 |
11274 | 95 def eval(self, tree): |
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96 """recursively evaluate a parse tree using node methods""" |
11274 | 97 if not isinstance(tree, tuple): |
98 return tree | |
99 return self._methods[tree[0]](*[self.eval(t) for t in tree[1:]]) | |
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100 |
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101 def __call__(self, tokeniter): |
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102 """parse tokens into a parse tree and evaluate if methods given""" |
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103 t = self.parse(tokeniter) |
11274 | 104 if self._methods: |
105 return self.eval(t) | |
106 return t | |
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107 |
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108 |
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109 def splitargspec(spec): |
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110 """Parse spec of function arguments into (poskeys, varkey, keys, optkey) |
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111 |
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112 >>> splitargspec(b'') |
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113 ([], None, [], None) |
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114 >>> splitargspec(b'foo bar') |
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115 ([], None, ['foo', 'bar'], None) |
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116 >>> splitargspec(b'foo *bar baz **qux') |
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117 (['foo'], 'bar', ['baz'], 'qux') |
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118 >>> splitargspec(b'*foo') |
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119 ([], 'foo', [], None) |
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120 >>> splitargspec(b'**foo') |
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121 ([], None, [], 'foo') |
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122 """ |
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123 optkey = None |
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124 pre, sep, post = spec.partition(b'**') |
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125 if sep: |
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126 posts = post.split() |
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127 if not posts: |
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128 raise error.ProgrammingError(b'no **optkey name provided') |
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129 if len(posts) > 1: |
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130 raise error.ProgrammingError(b'excessive **optkey names provided') |
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131 optkey = posts[0] |
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132 |
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133 pre, sep, post = pre.partition(b'*') |
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134 pres = pre.split() |
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135 posts = post.split() |
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136 if sep: |
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137 if not posts: |
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138 raise error.ProgrammingError(b'no *varkey name provided') |
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139 return pres, posts[0], posts[1:], optkey |
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140 return [], None, pres, optkey |
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141 |
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142 |
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143 def buildargsdict(trees, funcname, argspec, keyvaluenode, keynode): |
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144 """Build dict from list containing positional and keyword arguments |
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145 |
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146 Arguments are specified by a tuple of ``(poskeys, varkey, keys, optkey)`` |
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147 where |
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148 |
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149 - ``poskeys``: list of names of positional arguments |
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150 - ``varkey``: optional argument name that takes up remainder |
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151 - ``keys``: list of names that can be either positional or keyword arguments |
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152 - ``optkey``: optional argument name that takes up excess keyword arguments |
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153 |
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154 If ``varkey`` specified, all ``keys`` must be given as keyword arguments. |
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155 |
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156 Invalid keywords, too few positional arguments, or too many positional |
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157 arguments are rejected, but missing keyword arguments are just omitted. |
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158 """ |
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159 poskeys, varkey, keys, optkey = argspec |
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160 kwstart = next( |
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161 (i for i, x in enumerate(trees) if x and x[0] == keyvaluenode), |
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162 len(trees), |
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163 ) |
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164 if kwstart < len(poskeys): |
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165 raise error.ParseError( |
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166 _(b"%(func)s takes at least %(nargs)d positional arguments") |
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167 % {b'func': funcname, b'nargs': len(poskeys)} |
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168 ) |
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169 if not varkey and kwstart > len(poskeys) + len(keys): |
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170 raise error.ParseError( |
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171 _(b"%(func)s takes at most %(nargs)d positional arguments") |
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172 % {b'func': funcname, b'nargs': len(poskeys) + len(keys)} |
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173 ) |
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174 args = util.sortdict() |
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175 # consume positional arguments |
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176 for k, x in zip(poskeys, trees[:kwstart]): |
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177 args[k] = x |
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178 if varkey: |
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179 args[varkey] = trees[len(args) : kwstart] |
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180 else: |
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181 for k, x in zip(keys, trees[len(args) : kwstart]): |
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182 args[k] = x |
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183 # remainder should be keyword arguments |
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184 if optkey: |
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185 args[optkey] = util.sortdict() |
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186 for x in trees[kwstart:]: |
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187 if not x or x[0] != keyvaluenode or x[1][0] != keynode: |
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188 raise error.ParseError( |
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189 _(b"%(func)s got an invalid argument") % {b'func': funcname} |
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190 ) |
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191 k = x[1][1] |
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192 if k in keys: |
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193 d = args |
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194 elif not optkey: |
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195 raise error.ParseError( |
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196 _(b"%(func)s got an unexpected keyword argument '%(key)s'") |
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197 % {b'func': funcname, b'key': k} |
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198 ) |
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199 else: |
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200 d = args[optkey] |
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201 if k in d: |
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202 raise error.ParseError( |
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203 _( |
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204 b"%(func)s got multiple values for keyword " |
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205 b"argument '%(key)s'" |
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206 ) |
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207 % {b'func': funcname, b'key': k} |
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208 ) |
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209 d[k] = x[2] |
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210 return args |
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211 |
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212 |
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213 def unescapestr(s): |
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214 try: |
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215 return stringutil.unescapestr(s) |
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216 except ValueError as e: |
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217 # mangle Python's exception into our format |
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218 # TODO: remove this suppression. For some reason, pytype 2021.09.09 |
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219 # thinks .lower() is being called on Union[ValueError, bytes]. |
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220 # pytype: disable=attribute-error |
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221 raise error.ParseError(stringutil.forcebytestr(e).lower()) |
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222 # pytype: enable=attribute-error |
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223 |
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224 |
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225 def _prettyformat(tree, leafnodes, level, lines): |
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226 if not isinstance(tree, tuple): |
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227 lines.append((level, stringutil.pprint(tree))) |
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228 elif tree[0] in leafnodes: |
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229 rs = map(stringutil.pprint, tree[1:]) |
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230 lines.append((level, b'(%s %s)' % (tree[0], b' '.join(rs)))) |
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231 else: |
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232 lines.append((level, b'(%s' % tree[0])) |
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233 for s in tree[1:]: |
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234 _prettyformat(s, leafnodes, level + 1, lines) |
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235 lines[-1:] = [(lines[-1][0], lines[-1][1] + b')')] |
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236 |
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237 |
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238 def prettyformat(tree, leafnodes): |
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239 lines = [] |
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240 _prettyformat(tree, leafnodes, 0, lines) |
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241 output = b'\n'.join((b' ' * l + s) for l, s in lines) |
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242 return output |
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243 |
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244 |
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245 def simplifyinfixops(tree, targetnodes): |
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246 """Flatten chained infix operations to reduce usage of Python stack |
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247 |
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248 >>> from . import pycompat |
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249 >>> def f(tree): |
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250 ... s = prettyformat(simplifyinfixops(tree, (b'or',)), (b'symbol',)) |
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251 ... print(pycompat.sysstr(s)) |
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252 >>> f((b'or', |
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253 ... (b'or', |
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254 ... (b'symbol', b'1'), |
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255 ... (b'symbol', b'2')), |
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256 ... (b'symbol', b'3'))) |
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257 (or |
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258 (symbol '1') |
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259 (symbol '2') |
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260 (symbol '3')) |
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261 >>> f((b'func', |
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262 ... (b'symbol', b'p1'), |
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263 ... (b'or', |
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264 ... (b'or', |
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265 ... (b'func', |
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266 ... (b'symbol', b'sort'), |
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267 ... (b'list', |
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268 ... (b'or', |
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269 ... (b'or', |
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270 ... (b'symbol', b'1'), |
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271 ... (b'symbol', b'2')), |
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272 ... (b'symbol', b'3')), |
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273 ... (b'negate', |
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274 ... (b'symbol', b'rev')))), |
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275 ... (b'and', |
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276 ... (b'symbol', b'4'), |
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277 ... (b'group', |
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278 ... (b'or', |
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279 ... (b'or', |
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280 ... (b'symbol', b'5'), |
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281 ... (b'symbol', b'6')), |
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282 ... (b'symbol', b'7'))))), |
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283 ... (b'symbol', b'8')))) |
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284 (func |
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285 (symbol 'p1') |
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286 (or |
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287 (func |
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288 (symbol 'sort') |
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289 (list |
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290 (or |
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291 (symbol '1') |
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292 (symbol '2') |
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293 (symbol '3')) |
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294 (negate |
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295 (symbol 'rev')))) |
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296 (and |
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297 (symbol '4') |
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298 (group |
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299 (or |
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300 (symbol '5') |
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301 (symbol '6') |
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302 (symbol '7')))) |
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303 (symbol '8'))) |
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304 """ |
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305 if not isinstance(tree, tuple): |
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306 return tree |
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307 op = tree[0] |
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308 if op not in targetnodes: |
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309 return (op,) + tuple(simplifyinfixops(x, targetnodes) for x in tree[1:]) |
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310 |
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311 # walk down left nodes taking each right node. no recursion to left nodes |
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312 # because infix operators are left-associative, i.e. left tree is deep. |
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313 # e.g. '1 + 2 + 3' -> (+ (+ 1 2) 3) -> (+ 1 2 3) |
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314 simplified = [] |
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315 x = tree |
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316 while x[0] == op: |
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317 l, r = x[1:] |
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318 simplified.append(simplifyinfixops(r, targetnodes)) |
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319 x = l |
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320 simplified.append(simplifyinfixops(x, targetnodes)) |
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321 simplified.append(op) |
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322 return tuple(reversed(simplified)) |
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323 |
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324 |
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325 def _buildtree(template, placeholder, replstack): |
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326 if template == placeholder: |
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327 return replstack.pop() |
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328 if not isinstance(template, tuple): |
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329 return template |
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330 return tuple(_buildtree(x, placeholder, replstack) for x in template) |
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331 |
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332 |
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333 def buildtree(template, placeholder, *repls): |
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334 """Create new tree by substituting placeholders by replacements |
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335 |
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336 >>> _ = (b'symbol', b'_') |
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337 >>> def f(template, *repls): |
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338 ... return buildtree(template, _, *repls) |
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339 >>> f((b'func', (b'symbol', b'only'), (b'list', _, _)), |
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340 ... ('symbol', '1'), ('symbol', '2')) |
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341 ('func', ('symbol', 'only'), ('list', ('symbol', '1'), ('symbol', '2'))) |
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342 >>> f((b'and', _, (b'not', _)), (b'symbol', b'1'), (b'symbol', b'2')) |
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343 ('and', ('symbol', '1'), ('not', ('symbol', '2'))) |
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344 """ |
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345 if not isinstance(placeholder, tuple): |
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346 raise error.ProgrammingError(b'placeholder must be a node tuple') |
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347 replstack = list(reversed(repls)) |
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348 r = _buildtree(template, placeholder, replstack) |
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349 if replstack: |
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350 raise error.ProgrammingError(b'too many replacements') |
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351 return r |
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352 |
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353 |
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354 def _matchtree(pattern, tree, placeholder, incompletenodes, matches): |
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355 if pattern == tree: |
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356 return True |
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357 if not isinstance(pattern, tuple) or not isinstance(tree, tuple): |
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358 return False |
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359 if pattern == placeholder and tree[0] not in incompletenodes: |
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360 matches.append(tree) |
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361 return True |
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362 if len(pattern) != len(tree): |
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363 return False |
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364 return all( |
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365 _matchtree(p, x, placeholder, incompletenodes, matches) |
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366 for p, x in zip(pattern, tree) |
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367 ) |
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368 |
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369 |
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370 def matchtree(pattern, tree, placeholder=None, incompletenodes=()): |
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371 """If a tree matches the pattern, return a list of the tree and nodes |
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372 matched with the placeholder; Otherwise None |
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373 |
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374 >>> def f(pattern, tree): |
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375 ... m = matchtree(pattern, tree, _, {b'keyvalue', b'list'}) |
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376 ... if m: |
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377 ... return m[1:] |
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378 |
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379 >>> _ = (b'symbol', b'_') |
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380 >>> f((b'func', (b'symbol', b'ancestors'), _), |
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381 ... (b'func', (b'symbol', b'ancestors'), (b'symbol', b'1'))) |
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382 [('symbol', '1')] |
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383 >>> f((b'func', (b'symbol', b'ancestors'), _), |
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384 ... (b'func', (b'symbol', b'ancestors'), None)) |
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385 >>> f((b'range', (b'dagrange', _, _), _), |
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386 ... (b'range', |
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387 ... (b'dagrange', (b'symbol', b'1'), (b'symbol', b'2')), |
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388 ... (b'symbol', b'3'))) |
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389 [('symbol', '1'), ('symbol', '2'), ('symbol', '3')] |
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390 |
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391 The placeholder does not match the specified incomplete nodes because |
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392 an incomplete node (e.g. argument list) cannot construct an expression. |
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393 |
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394 >>> f((b'func', (b'symbol', b'ancestors'), _), |
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395 ... (b'func', (b'symbol', b'ancestors'), |
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396 ... (b'list', (b'symbol', b'1'), (b'symbol', b'2')))) |
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397 |
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398 The placeholder may be omitted, but which shouldn't match a None node. |
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399 |
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400 >>> _ = None |
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401 >>> f((b'func', (b'symbol', b'ancestors'), None), |
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402 ... (b'func', (b'symbol', b'ancestors'), (b'symbol', b'0'))) |
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403 """ |
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404 if placeholder is not None and not isinstance(placeholder, tuple): |
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405 raise error.ProgrammingError(b'placeholder must be a node tuple') |
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406 matches = [tree] |
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407 if _matchtree(pattern, tree, placeholder, incompletenodes, matches): |
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408 return matches |
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409 |
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410 |
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411 def parseerrordetail(inst): |
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412 """Compose error message from specified ParseError object""" |
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413 if inst.location is not None: |
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414 return _(b'at %d: %s') % (inst.location, inst.message) |
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415 else: |
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416 return inst.message |
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417 |
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418 |
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419 class alias(object): |
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420 """Parsed result of alias""" |
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421 |
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422 def __init__(self, name, args, err, replacement): |
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423 self.name = name |
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424 self.args = args |
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425 self.error = err |
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426 self.replacement = replacement |
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427 # whether own `error` information is already shown or not. |
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428 # this avoids showing same warning multiple times at each |
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429 # `expandaliases`. |
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430 self.warned = False |
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431 |
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432 |
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433 class basealiasrules(object): |
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434 """Parsing and expansion rule set of aliases |
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435 |
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436 This is a helper for fileset/revset/template aliases. A concrete rule set |
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437 should be made by sub-classing this and implementing class/static methods. |
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438 |
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439 It supports alias expansion of symbol and function-call styles:: |
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440 |
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441 # decl = defn |
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442 h = heads(default) |
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443 b($1) = ancestors($1) - ancestors(default) |
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444 """ |
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445 |
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446 # typically a config section, which will be included in error messages |
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447 _section = None |
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448 # tag of symbol node |
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449 _symbolnode = b'symbol' |
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450 |
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451 def __new__(cls): |
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452 raise TypeError(b"'%s' is not instantiatable" % cls.__name__) |
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453 |
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454 @staticmethod |
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455 def _parse(spec): |
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456 """Parse an alias name, arguments and definition""" |
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457 raise NotImplementedError |
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458 |
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459 @staticmethod |
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460 def _trygetfunc(tree): |
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461 """Return (name, args) if tree is a function; otherwise None""" |
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462 raise NotImplementedError |
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463 |
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464 @classmethod |
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465 def _builddecl(cls, decl): |
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466 """Parse an alias declaration into ``(name, args, errorstr)`` |
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467 |
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468 This function analyzes the parsed tree. The parsing rule is provided |
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469 by ``_parse()``. |
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470 |
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471 - ``name``: of declared alias (may be ``decl`` itself at error) |
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472 - ``args``: list of argument names (or None for symbol declaration) |
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473 - ``errorstr``: detail about detected error (or None) |
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474 |
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475 >>> sym = lambda x: (b'symbol', x) |
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476 >>> symlist = lambda *xs: (b'list',) + tuple(sym(x) for x in xs) |
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477 >>> func = lambda n, a: (b'func', sym(n), a) |
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478 >>> parsemap = { |
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479 ... b'foo': sym(b'foo'), |
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480 ... b'$foo': sym(b'$foo'), |
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481 ... b'foo::bar': (b'dagrange', sym(b'foo'), sym(b'bar')), |
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482 ... b'foo()': func(b'foo', None), |
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483 ... b'$foo()': func(b'$foo', None), |
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484 ... b'foo($1, $2)': func(b'foo', symlist(b'$1', b'$2')), |
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485 ... b'foo(bar_bar, baz.baz)': |
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486 ... func(b'foo', symlist(b'bar_bar', b'baz.baz')), |
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487 ... b'foo(bar($1, $2))': |
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488 ... func(b'foo', func(b'bar', symlist(b'$1', b'$2'))), |
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489 ... b'foo($1, $2, nested($1, $2))': |
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490 ... func(b'foo', (symlist(b'$1', b'$2') + |
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491 ... (func(b'nested', symlist(b'$1', b'$2')),))), |
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492 ... b'foo("bar")': func(b'foo', (b'string', b'bar')), |
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493 ... b'foo($1, $2': error.ParseError(b'unexpected token: end', 10), |
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494 ... b'foo("bar': error.ParseError(b'unterminated string', 5), |
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495 ... b'foo($1, $2, $1)': func(b'foo', symlist(b'$1', b'$2', b'$1')), |
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496 ... } |
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497 >>> def parse(expr): |
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498 ... x = parsemap[expr] |
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499 ... if isinstance(x, Exception): |
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500 ... raise x |
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501 ... return x |
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502 >>> def trygetfunc(tree): |
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503 ... if not tree or tree[0] != b'func' or tree[1][0] != b'symbol': |
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504 ... return None |
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505 ... if not tree[2]: |
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506 ... return tree[1][1], [] |
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507 ... if tree[2][0] == b'list': |
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508 ... return tree[1][1], list(tree[2][1:]) |
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509 ... return tree[1][1], [tree[2]] |
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510 >>> class aliasrules(basealiasrules): |
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511 ... _parse = staticmethod(parse) |
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512 ... _trygetfunc = staticmethod(trygetfunc) |
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513 >>> builddecl = aliasrules._builddecl |
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514 >>> builddecl(b'foo') |
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515 ('foo', None, None) |
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516 >>> builddecl(b'$foo') |
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517 ('$foo', None, "invalid symbol '$foo'") |
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518 >>> builddecl(b'foo::bar') |
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519 ('foo::bar', None, 'invalid format') |
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520 >>> builddecl(b'foo()') |
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521 ('foo', [], None) |
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522 >>> builddecl(b'$foo()') |
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523 ('$foo()', None, "invalid function '$foo'") |
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524 >>> builddecl(b'foo($1, $2)') |
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525 ('foo', ['$1', '$2'], None) |
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526 >>> builddecl(b'foo(bar_bar, baz.baz)') |
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527 ('foo', ['bar_bar', 'baz.baz'], None) |
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528 >>> builddecl(b'foo($1, $2, nested($1, $2))') |
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529 ('foo($1, $2, nested($1, $2))', None, 'invalid argument list') |
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530 >>> builddecl(b'foo(bar($1, $2))') |
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531 ('foo(bar($1, $2))', None, 'invalid argument list') |
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532 >>> builddecl(b'foo("bar")') |
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533 ('foo("bar")', None, 'invalid argument list') |
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534 >>> builddecl(b'foo($1, $2') |
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535 ('foo($1, $2', None, 'at 10: unexpected token: end') |
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536 >>> builddecl(b'foo("bar') |
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537 ('foo("bar', None, 'at 5: unterminated string') |
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538 >>> builddecl(b'foo($1, $2, $1)') |
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539 ('foo', None, 'argument names collide with each other') |
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540 """ |
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541 try: |
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542 tree = cls._parse(decl) |
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543 except error.ParseError as inst: |
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544 return (decl, None, parseerrordetail(inst)) |
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545 |
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546 if tree[0] == cls._symbolnode: |
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547 # "name = ...." style |
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548 name = tree[1] |
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549 if name.startswith(b'$'): |
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550 return (decl, None, _(b"invalid symbol '%s'") % name) |
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551 return (name, None, None) |
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552 |
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553 func = cls._trygetfunc(tree) |
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554 if func: |
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555 # "name(arg, ....) = ...." style |
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556 name, args = func |
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557 if name.startswith(b'$'): |
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558 return (decl, None, _(b"invalid function '%s'") % name) |
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559 if any(t[0] != cls._symbolnode for t in args): |
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560 return (decl, None, _(b"invalid argument list")) |
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561 if len(args) != len(set(args)): |
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562 return ( |
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563 name, |
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564 None, |
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565 _(b"argument names collide with each other"), |
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566 ) |
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567 return (name, [t[1] for t in args], None) |
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568 |
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569 return (decl, None, _(b"invalid format")) |
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570 |
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571 @classmethod |
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572 def _relabelargs(cls, tree, args): |
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573 """Mark alias arguments as ``_aliasarg``""" |
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574 if not isinstance(tree, tuple): |
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575 return tree |
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576 op = tree[0] |
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577 if op != cls._symbolnode: |
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578 return (op,) + tuple(cls._relabelargs(x, args) for x in tree[1:]) |
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579 |
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580 assert len(tree) == 2 |
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581 sym = tree[1] |
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582 if sym in args: |
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583 op = b'_aliasarg' |
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584 elif sym.startswith(b'$'): |
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585 raise error.ParseError(_(b"invalid symbol '%s'") % sym) |
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586 return (op, sym) |
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587 |
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588 @classmethod |
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589 def _builddefn(cls, defn, args): |
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590 """Parse an alias definition into a tree and marks substitutions |
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591 |
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592 This function marks alias argument references as ``_aliasarg``. The |
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593 parsing rule is provided by ``_parse()``. |
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594 |
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595 ``args`` is a list of alias argument names, or None if the alias |
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596 is declared as a symbol. |
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597 |
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598 >>> from . import pycompat |
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599 >>> parsemap = { |
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600 ... b'$1 or foo': (b'or', (b'symbol', b'$1'), (b'symbol', b'foo')), |
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601 ... b'$1 or $bar': |
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602 ... (b'or', (b'symbol', b'$1'), (b'symbol', b'$bar')), |
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603 ... b'$10 or baz': |
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604 ... (b'or', (b'symbol', b'$10'), (b'symbol', b'baz')), |
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605 ... b'"$1" or "foo"': |
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606 ... (b'or', (b'string', b'$1'), (b'string', b'foo')), |
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607 ... } |
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608 >>> class aliasrules(basealiasrules): |
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609 ... _parse = staticmethod(parsemap.__getitem__) |
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610 ... _trygetfunc = staticmethod(lambda x: None) |
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611 >>> builddefn = aliasrules._builddefn |
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612 >>> def pprint(tree): |
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613 ... s = prettyformat(tree, (b'_aliasarg', b'string', b'symbol')) |
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614 ... print(pycompat.sysstr(s)) |
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615 >>> args = [b'$1', b'$2', b'foo'] |
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616 >>> pprint(builddefn(b'$1 or foo', args)) |
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617 (or |
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618 (_aliasarg '$1') |
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619 (_aliasarg 'foo')) |
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620 >>> try: |
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621 ... builddefn(b'$1 or $bar', args) |
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622 ... except error.ParseError as inst: |
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623 ... print(pycompat.sysstr(parseerrordetail(inst))) |
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624 invalid symbol '$bar' |
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625 >>> args = [b'$1', b'$10', b'foo'] |
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626 >>> pprint(builddefn(b'$10 or baz', args)) |
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627 (or |
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628 (_aliasarg '$10') |
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629 (symbol 'baz')) |
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630 >>> pprint(builddefn(b'"$1" or "foo"', args)) |
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631 (or |
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632 (string '$1') |
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633 (string 'foo')) |
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634 """ |
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635 tree = cls._parse(defn) |
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636 if args: |
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637 args = set(args) |
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638 else: |
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639 args = set() |
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640 return cls._relabelargs(tree, args) |
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641 |
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642 @classmethod |
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643 def build(cls, decl, defn): |
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644 """Parse an alias declaration and definition into an alias object""" |
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645 repl = efmt = None |
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646 name, args, err = cls._builddecl(decl) |
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647 if err: |
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648 efmt = _(b'bad declaration of %(section)s "%(name)s": %(error)s') |
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649 else: |
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650 try: |
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651 repl = cls._builddefn(defn, args) |
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652 except error.ParseError as inst: |
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653 err = parseerrordetail(inst) |
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654 efmt = _(b'bad definition of %(section)s "%(name)s": %(error)s') |
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655 if err: |
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656 err = efmt % { |
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657 b'section': cls._section, |
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658 b'name': name, |
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659 b'error': err, |
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660 } |
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661 return alias(name, args, err, repl) |
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662 |
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663 @classmethod |
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664 def buildmap(cls, items): |
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665 """Parse a list of alias (name, replacement) pairs into a dict of |
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666 alias objects""" |
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667 aliases = {} |
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668 for decl, defn in items: |
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669 a = cls.build(decl, defn) |
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670 aliases[a.name] = a |
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671 return aliases |
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672 |
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673 @classmethod |
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674 def _getalias(cls, aliases, tree): |
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675 """If tree looks like an unexpanded alias, return (alias, pattern-args) |
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676 pair. Return None otherwise. |
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677 """ |
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678 if not isinstance(tree, tuple): |
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679 return None |
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680 if tree[0] == cls._symbolnode: |
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681 name = tree[1] |
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682 a = aliases.get(name) |
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683 if a and a.args is None: |
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684 return a, None |
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685 func = cls._trygetfunc(tree) |
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686 if func: |
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687 name, args = func |
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688 a = aliases.get(name) |
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689 if a and a.args is not None: |
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690 return a, args |
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691 return None |
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692 |
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693 @classmethod |
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694 def _expandargs(cls, tree, args): |
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695 """Replace _aliasarg instances with the substitution value of the |
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696 same name in args, recursively. |
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697 """ |
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698 if not isinstance(tree, tuple): |
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699 return tree |
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700 if tree[0] == b'_aliasarg': |
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701 sym = tree[1] |
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702 return args[sym] |
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703 return tuple(cls._expandargs(t, args) for t in tree) |
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704 |
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705 @classmethod |
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706 def _expand(cls, aliases, tree, expanding, cache): |
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707 if not isinstance(tree, tuple): |
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708 return tree |
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709 r = cls._getalias(aliases, tree) |
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710 if r is None: |
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711 return tuple( |
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712 cls._expand(aliases, t, expanding, cache) for t in tree |
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713 ) |
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714 a, l = r |
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715 if a.error: |
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716 raise error.Abort(a.error) |
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717 if a in expanding: |
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718 raise error.ParseError( |
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719 _(b'infinite expansion of %(section)s "%(name)s" detected') |
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720 % {b'section': cls._section, b'name': a.name} |
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721 ) |
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722 # get cacheable replacement tree by expanding aliases recursively |
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723 expanding.append(a) |
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724 if a.name not in cache: |
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725 cache[a.name] = cls._expand( |
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726 aliases, a.replacement, expanding, cache |
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727 ) |
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728 result = cache[a.name] |
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729 expanding.pop() |
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730 if a.args is None: |
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731 return result |
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732 # substitute function arguments in replacement tree |
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733 if len(l) != len(a.args): |
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734 raise error.ParseError( |
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735 _(b'invalid number of arguments: %d') % len(l) |
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736 ) |
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737 l = [cls._expand(aliases, t, [], cache) for t in l] |
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738 return cls._expandargs(result, dict(zip(a.args, l))) |
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739 |
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740 @classmethod |
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741 def expand(cls, aliases, tree): |
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742 """Expand aliases in tree, recursively. |
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743 |
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744 'aliases' is a dictionary mapping user defined aliases to alias objects. |
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745 """ |
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746 return cls._expand(aliases, tree, [], {}) |