Mercurial > hg
annotate mercurial/parser.py @ 48180:f78d8b8c46d7
setup: stop packaging python3.dll and python3X.dll in the wheel distribution
Now that exewrapper is smart enough to find the DLLs it needs without help from
the build script, backout ed286d150aa8 and 2960b7fac966. Note that this will
require deleting the build/lib.win-amd64-3.X directory to actually remove it
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Differential Revision: https://phab.mercurial-scm.org/D11455
author | Matt Harbison <matt_harbison@yahoo.com> |
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date | Sun, 19 Sep 2021 01:36:37 -0400 |
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, [], {}) |