Mercurial > hg
annotate mercurial/parser.py @ 37695:570a4426c5b8
hgweb: make sessionvars class less dense
author | Yuya Nishihara <yuya@tcha.org> |
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date | Sun, 01 Apr 2018 23:03:58 +0900 |
parents | f0b6fbea00cf |
children | 0a2ce5b43574 |
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11274 | 1 # parser.py - simple top-down operator precedence parser for mercurial |
2 # | |
3 # Copyright 2010 Matt Mackall <mpm@selenic.com> | |
4 # | |
5 # This software may be used and distributed according to the terms of the | |
6 # GNU General Public License version 2 or any later version. | |
7 | |
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8 # see http://effbot.org/zone/simple-top-down-parsing.htm and |
11274 | 9 # http://eli.thegreenplace.net/2010/01/02/top-down-operator-precedence-parsing/ |
10 # for background | |
11 | |
12 # takes a tokenizer and elements | |
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13 # tokenizer is an iterator that returns (type, value, pos) tuples |
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14 # elements is a mapping of types to binding strength, primary, prefix, infix |
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15 # and suffix actions |
11274 | 16 # an action is a tree node name, a tree label, and an optional match |
17500 | 17 # __call__(program) parses program into a labeled tree |
11274 | 18 |
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19 from __future__ import absolute_import, 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 encoding, |
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24 error, |
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25 pycompat, |
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26 util, |
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27 ) |
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28 from .utils import ( |
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29 stringutil, |
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30 ) |
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31 |
11274 | 32 class parser(object): |
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33 def __init__(self, elements, methods=None): |
11274 | 34 self._elements = elements |
35 self._methods = methods | |
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36 self.current = None |
11274 | 37 def _advance(self): |
38 'advance the tokenizer' | |
39 t = self.current | |
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40 self.current = next(self._iter, None) |
11274 | 41 return t |
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42 def _hasnewterm(self): |
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43 'True if next token may start new term' |
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44 return any(self._elements[self.current[0]][1:3]) |
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45 def _match(self, m): |
11274 | 46 'make sure the tokenizer matches an end condition' |
47 if self.current[0] != m: | |
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48 raise error.ParseError(_("unexpected token: %s") % self.current[0], |
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49 self.current[2]) |
11274 | 50 self._advance() |
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51 def _parseoperand(self, bind, m=None): |
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52 'gather right-hand-side operand until an end condition or binding met' |
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53 if m and self.current[0] == m: |
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54 expr = None |
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55 else: |
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56 expr = self._parse(bind) |
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57 if m: |
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58 self._match(m) |
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59 return expr |
11274 | 60 def _parse(self, bind=0): |
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61 token, value, pos = self._advance() |
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62 # handle prefix rules on current token, take as primary if unambiguous |
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63 primary, prefix = self._elements[token][1:3] |
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64 if primary and not (prefix and self._hasnewterm()): |
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65 expr = (primary, value) |
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66 elif prefix: |
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67 expr = (prefix[0], self._parseoperand(*prefix[1:])) |
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68 else: |
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69 raise error.ParseError(_("not a prefix: %s") % token, pos) |
11274 | 70 # gather tokens until we meet a lower binding strength |
71 while bind < self._elements[self.current[0]][0]: | |
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72 token, value, pos = self._advance() |
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73 # handle infix rules, take as suffix if unambiguous |
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74 infix, suffix = self._elements[token][3:] |
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75 if suffix and not (infix and self._hasnewterm()): |
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76 expr = (suffix, expr) |
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77 elif infix: |
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78 expr = (infix[0], expr, self._parseoperand(*infix[1:])) |
11274 | 79 else: |
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80 raise error.ParseError(_("not an infix: %s") % token, pos) |
11274 | 81 return expr |
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82 def parse(self, tokeniter): |
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83 'generate a parse tree from tokens' |
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84 self._iter = tokeniter |
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85 self._advance() |
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86 res = self._parse() |
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87 token, value, pos = self.current |
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88 return res, pos |
11274 | 89 def eval(self, tree): |
90 'recursively evaluate a parse tree using node methods' | |
91 if not isinstance(tree, tuple): | |
92 return tree | |
93 return self._methods[tree[0]](*[self.eval(t) for t in tree[1:]]) | |
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94 def __call__(self, tokeniter): |
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95 'parse tokens into a parse tree and evaluate if methods given' |
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96 t = self.parse(tokeniter) |
11274 | 97 if self._methods: |
98 return self.eval(t) | |
99 return t | |
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100 |
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101 def splitargspec(spec): |
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102 """Parse spec of function arguments into (poskeys, varkey, keys, optkey) |
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103 |
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104 >>> splitargspec(b'') |
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105 ([], None, [], None) |
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106 >>> splitargspec(b'foo bar') |
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107 ([], None, ['foo', 'bar'], None) |
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108 >>> splitargspec(b'foo *bar baz **qux') |
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109 (['foo'], 'bar', ['baz'], 'qux') |
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110 >>> splitargspec(b'*foo') |
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111 ([], 'foo', [], None) |
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112 >>> splitargspec(b'**foo') |
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113 ([], None, [], 'foo') |
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114 """ |
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115 optkey = None |
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116 pre, sep, post = spec.partition('**') |
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117 if sep: |
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118 posts = post.split() |
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119 if not posts: |
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120 raise error.ProgrammingError('no **optkey name provided') |
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121 if len(posts) > 1: |
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122 raise error.ProgrammingError('excessive **optkey names provided') |
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123 optkey = posts[0] |
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124 |
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125 pre, sep, post = pre.partition('*') |
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126 pres = pre.split() |
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127 posts = post.split() |
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128 if sep: |
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129 if not posts: |
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130 raise error.ProgrammingError('no *varkey name provided') |
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131 return pres, posts[0], posts[1:], optkey |
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132 return [], None, pres, optkey |
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133 |
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134 def buildargsdict(trees, funcname, argspec, keyvaluenode, keynode): |
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135 """Build dict from list containing positional and keyword arguments |
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136 |
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137 Arguments are specified by a tuple of ``(poskeys, varkey, keys, optkey)`` |
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138 where |
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139 |
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140 - ``poskeys``: list of names of positional arguments |
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141 - ``varkey``: optional argument name that takes up remainder |
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142 - ``keys``: list of names that can be either positional or keyword arguments |
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143 - ``optkey``: optional argument name that takes up excess keyword arguments |
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144 |
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145 If ``varkey`` specified, all ``keys`` must be given as keyword arguments. |
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146 |
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147 Invalid keywords, too few positional arguments, or too many positional |
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148 arguments are rejected, but missing keyword arguments are just omitted. |
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149 """ |
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150 poskeys, varkey, keys, optkey = argspec |
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151 kwstart = next((i for i, x in enumerate(trees) if x[0] == keyvaluenode), |
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152 len(trees)) |
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153 if kwstart < len(poskeys): |
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154 raise error.ParseError(_("%(func)s takes at least %(nargs)d positional " |
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155 "arguments") |
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156 % {'func': funcname, 'nargs': len(poskeys)}) |
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157 if not varkey and kwstart > len(poskeys) + len(keys): |
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158 raise error.ParseError(_("%(func)s takes at most %(nargs)d positional " |
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159 "arguments") |
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160 % {'func': funcname, |
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161 'nargs': len(poskeys) + len(keys)}) |
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162 args = util.sortdict() |
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163 # consume positional arguments |
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164 for k, x in zip(poskeys, trees[:kwstart]): |
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165 args[k] = x |
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166 if varkey: |
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167 args[varkey] = trees[len(args):kwstart] |
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168 else: |
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169 for k, x in zip(keys, trees[len(args):kwstart]): |
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170 args[k] = x |
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171 # remainder should be keyword arguments |
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172 if optkey: |
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173 args[optkey] = util.sortdict() |
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174 for x in trees[kwstart:]: |
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175 if x[0] != keyvaluenode or x[1][0] != keynode: |
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176 raise error.ParseError(_("%(func)s got an invalid argument") |
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177 % {'func': funcname}) |
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178 k = x[1][1] |
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179 if k in keys: |
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180 d = args |
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181 elif not optkey: |
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182 raise error.ParseError(_("%(func)s got an unexpected keyword " |
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183 "argument '%(key)s'") |
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184 % {'func': funcname, 'key': k}) |
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185 else: |
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186 d = args[optkey] |
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187 if k in d: |
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188 raise error.ParseError(_("%(func)s got multiple values for keyword " |
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189 "argument '%(key)s'") |
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190 % {'func': funcname, 'key': k}) |
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191 d[k] = x[2] |
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192 return args |
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193 |
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194 def unescapestr(s): |
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195 try: |
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196 return stringutil.unescapestr(s) |
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197 except ValueError as e: |
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198 # mangle Python's exception into our format |
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199 raise error.ParseError(pycompat.bytestr(e).lower()) |
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200 |
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201 def _brepr(obj): |
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202 if isinstance(obj, bytes): |
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203 return b"'%s'" % stringutil.escapestr(obj) |
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204 return encoding.strtolocal(repr(obj)) |
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205 |
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206 def _prettyformat(tree, leafnodes, level, lines): |
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207 if not isinstance(tree, tuple): |
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208 lines.append((level, _brepr(tree))) |
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209 elif tree[0] in leafnodes: |
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210 rs = map(_brepr, tree[1:]) |
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211 lines.append((level, '(%s %s)' % (tree[0], ' '.join(rs)))) |
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212 else: |
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213 lines.append((level, '(%s' % tree[0])) |
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214 for s in tree[1:]: |
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215 _prettyformat(s, leafnodes, level + 1, lines) |
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216 lines[-1:] = [(lines[-1][0], lines[-1][1] + ')')] |
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217 |
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218 def prettyformat(tree, leafnodes): |
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219 lines = [] |
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220 _prettyformat(tree, leafnodes, 0, lines) |
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221 output = '\n'.join((' ' * l + s) for l, s in lines) |
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222 return output |
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223 |
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224 def simplifyinfixops(tree, targetnodes): |
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225 """Flatten chained infix operations to reduce usage of Python stack |
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226 |
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227 >>> from . import pycompat |
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228 >>> def f(tree): |
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229 ... s = prettyformat(simplifyinfixops(tree, (b'or',)), (b'symbol',)) |
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230 ... print(pycompat.sysstr(s)) |
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231 >>> f((b'or', |
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232 ... (b'or', |
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233 ... (b'symbol', b'1'), |
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234 ... (b'symbol', b'2')), |
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235 ... (b'symbol', b'3'))) |
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236 (or |
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237 (symbol '1') |
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238 (symbol '2') |
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239 (symbol '3')) |
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240 >>> f((b'func', |
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241 ... (b'symbol', b'p1'), |
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242 ... (b'or', |
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243 ... (b'or', |
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244 ... (b'func', |
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245 ... (b'symbol', b'sort'), |
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246 ... (b'list', |
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247 ... (b'or', |
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248 ... (b'or', |
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249 ... (b'symbol', b'1'), |
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250 ... (b'symbol', b'2')), |
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251 ... (b'symbol', b'3')), |
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252 ... (b'negate', |
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253 ... (b'symbol', b'rev')))), |
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254 ... (b'and', |
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255 ... (b'symbol', b'4'), |
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256 ... (b'group', |
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257 ... (b'or', |
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258 ... (b'or', |
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259 ... (b'symbol', b'5'), |
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260 ... (b'symbol', b'6')), |
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261 ... (b'symbol', b'7'))))), |
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262 ... (b'symbol', b'8')))) |
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263 (func |
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264 (symbol 'p1') |
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265 (or |
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266 (func |
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267 (symbol 'sort') |
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268 (list |
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269 (or |
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270 (symbol '1') |
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271 (symbol '2') |
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272 (symbol '3')) |
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273 (negate |
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274 (symbol 'rev')))) |
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275 (and |
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276 (symbol '4') |
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277 (group |
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278 (or |
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279 (symbol '5') |
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280 (symbol '6') |
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281 (symbol '7')))) |
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282 (symbol '8'))) |
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283 """ |
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284 if not isinstance(tree, tuple): |
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285 return tree |
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286 op = tree[0] |
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287 if op not in targetnodes: |
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288 return (op,) + tuple(simplifyinfixops(x, targetnodes) for x in tree[1:]) |
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289 |
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290 # walk down left nodes taking each right node. no recursion to left nodes |
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291 # because infix operators are left-associative, i.e. left tree is deep. |
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292 # e.g. '1 + 2 + 3' -> (+ (+ 1 2) 3) -> (+ 1 2 3) |
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293 simplified = [] |
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294 x = tree |
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295 while x[0] == op: |
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296 l, r = x[1:] |
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297 simplified.append(simplifyinfixops(r, targetnodes)) |
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298 x = l |
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299 simplified.append(simplifyinfixops(x, targetnodes)) |
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300 simplified.append(op) |
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301 return tuple(reversed(simplified)) |
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302 |
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303 def _buildtree(template, placeholder, replstack): |
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304 if template == placeholder: |
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305 return replstack.pop() |
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306 if not isinstance(template, tuple): |
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307 return template |
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308 return tuple(_buildtree(x, placeholder, replstack) for x in template) |
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309 |
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310 def buildtree(template, placeholder, *repls): |
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311 """Create new tree by substituting placeholders by replacements |
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312 |
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313 >>> _ = (b'symbol', b'_') |
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314 >>> def f(template, *repls): |
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315 ... return buildtree(template, _, *repls) |
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316 >>> f((b'func', (b'symbol', b'only'), (b'list', _, _)), |
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317 ... ('symbol', '1'), ('symbol', '2')) |
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318 ('func', ('symbol', 'only'), ('list', ('symbol', '1'), ('symbol', '2'))) |
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319 >>> f((b'and', _, (b'not', _)), (b'symbol', b'1'), (b'symbol', b'2')) |
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320 ('and', ('symbol', '1'), ('not', ('symbol', '2'))) |
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321 """ |
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322 if not isinstance(placeholder, tuple): |
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323 raise error.ProgrammingError('placeholder must be a node tuple') |
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324 replstack = list(reversed(repls)) |
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325 r = _buildtree(template, placeholder, replstack) |
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326 if replstack: |
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327 raise error.ProgrammingError('too many replacements') |
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328 return r |
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329 |
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330 def _matchtree(pattern, tree, placeholder, incompletenodes, matches): |
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331 if pattern == tree: |
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332 return True |
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333 if not isinstance(pattern, tuple) or not isinstance(tree, tuple): |
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334 return False |
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335 if pattern == placeholder and tree[0] not in incompletenodes: |
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336 matches.append(tree) |
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337 return True |
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338 if len(pattern) != len(tree): |
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339 return False |
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340 return all(_matchtree(p, x, placeholder, incompletenodes, matches) |
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341 for p, x in zip(pattern, tree)) |
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342 |
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343 def matchtree(pattern, tree, placeholder=None, incompletenodes=()): |
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344 """If a tree matches the pattern, return a list of the tree and nodes |
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345 matched with the placeholder; Otherwise None |
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346 |
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347 >>> def f(pattern, tree): |
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348 ... m = matchtree(pattern, tree, _, {b'keyvalue', b'list'}) |
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349 ... if m: |
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350 ... return m[1:] |
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351 |
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352 >>> _ = (b'symbol', b'_') |
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353 >>> f((b'func', (b'symbol', b'ancestors'), _), |
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354 ... (b'func', (b'symbol', b'ancestors'), (b'symbol', b'1'))) |
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355 [('symbol', '1')] |
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356 >>> f((b'func', (b'symbol', b'ancestors'), _), |
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357 ... (b'func', (b'symbol', b'ancestors'), None)) |
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358 >>> f((b'range', (b'dagrange', _, _), _), |
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359 ... (b'range', |
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360 ... (b'dagrange', (b'symbol', b'1'), (b'symbol', b'2')), |
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361 ... (b'symbol', b'3'))) |
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362 [('symbol', '1'), ('symbol', '2'), ('symbol', '3')] |
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363 |
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364 The placeholder does not match the specified incomplete nodes because |
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365 an incomplete node (e.g. argument list) cannot construct an expression. |
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366 |
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367 >>> f((b'func', (b'symbol', b'ancestors'), _), |
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368 ... (b'func', (b'symbol', b'ancestors'), |
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369 ... (b'list', (b'symbol', b'1'), (b'symbol', b'2')))) |
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370 |
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371 The placeholder may be omitted, but which shouldn't match a None node. |
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372 |
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373 >>> _ = None |
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374 >>> f((b'func', (b'symbol', b'ancestors'), None), |
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375 ... (b'func', (b'symbol', b'ancestors'), (b'symbol', b'0'))) |
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376 """ |
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377 if placeholder is not None and not isinstance(placeholder, tuple): |
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378 raise error.ProgrammingError('placeholder must be a node tuple') |
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379 matches = [tree] |
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380 if _matchtree(pattern, tree, placeholder, incompletenodes, matches): |
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381 return matches |
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382 |
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383 def parseerrordetail(inst): |
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384 """Compose error message from specified ParseError object |
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385 """ |
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386 if len(inst.args) > 1: |
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387 return _('at %d: %s') % (inst.args[1], inst.args[0]) |
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388 else: |
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389 return inst.args[0] |
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390 |
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391 class alias(object): |
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392 """Parsed result of alias""" |
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393 |
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394 def __init__(self, name, args, err, replacement): |
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395 self.name = name |
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396 self.args = args |
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397 self.error = err |
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398 self.replacement = replacement |
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399 # whether own `error` information is already shown or not. |
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400 # this avoids showing same warning multiple times at each |
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401 # `expandaliases`. |
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402 self.warned = False |
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403 |
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404 class basealiasrules(object): |
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405 """Parsing and expansion rule set of aliases |
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406 |
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407 This is a helper for fileset/revset/template aliases. A concrete rule set |
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408 should be made by sub-classing this and implementing class/static methods. |
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409 |
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410 It supports alias expansion of symbol and function-call styles:: |
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411 |
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412 # decl = defn |
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413 h = heads(default) |
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414 b($1) = ancestors($1) - ancestors(default) |
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415 """ |
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416 # typically a config section, which will be included in error messages |
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417 _section = None |
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418 # tag of symbol node |
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419 _symbolnode = 'symbol' |
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420 |
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421 def __new__(cls): |
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422 raise TypeError("'%s' is not instantiatable" % cls.__name__) |
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423 |
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424 @staticmethod |
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425 def _parse(spec): |
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426 """Parse an alias name, arguments and definition""" |
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427 raise NotImplementedError |
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428 |
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429 @staticmethod |
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430 def _trygetfunc(tree): |
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431 """Return (name, args) if tree is a function; otherwise None""" |
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432 raise NotImplementedError |
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433 |
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434 @classmethod |
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435 def _builddecl(cls, decl): |
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436 """Parse an alias declaration into ``(name, args, errorstr)`` |
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437 |
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438 This function analyzes the parsed tree. The parsing rule is provided |
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439 by ``_parse()``. |
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440 |
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441 - ``name``: of declared alias (may be ``decl`` itself at error) |
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442 - ``args``: list of argument names (or None for symbol declaration) |
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443 - ``errorstr``: detail about detected error (or None) |
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444 |
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445 >>> sym = lambda x: (b'symbol', x) |
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446 >>> symlist = lambda *xs: (b'list',) + tuple(sym(x) for x in xs) |
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447 >>> func = lambda n, a: (b'func', sym(n), a) |
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448 >>> parsemap = { |
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449 ... b'foo': sym(b'foo'), |
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450 ... b'$foo': sym(b'$foo'), |
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451 ... b'foo::bar': (b'dagrange', sym(b'foo'), sym(b'bar')), |
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452 ... b'foo()': func(b'foo', None), |
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453 ... b'$foo()': func(b'$foo', None), |
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454 ... b'foo($1, $2)': func(b'foo', symlist(b'$1', b'$2')), |
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455 ... b'foo(bar_bar, baz.baz)': |
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456 ... func(b'foo', symlist(b'bar_bar', b'baz.baz')), |
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457 ... b'foo(bar($1, $2))': |
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458 ... func(b'foo', func(b'bar', symlist(b'$1', b'$2'))), |
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459 ... b'foo($1, $2, nested($1, $2))': |
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460 ... func(b'foo', (symlist(b'$1', b'$2') + |
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461 ... (func(b'nested', symlist(b'$1', b'$2')),))), |
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462 ... b'foo("bar")': func(b'foo', (b'string', b'bar')), |
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463 ... b'foo($1, $2': error.ParseError(b'unexpected token: end', 10), |
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464 ... b'foo("bar': error.ParseError(b'unterminated string', 5), |
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465 ... b'foo($1, $2, $1)': func(b'foo', symlist(b'$1', b'$2', b'$1')), |
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466 ... } |
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467 >>> def parse(expr): |
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468 ... x = parsemap[expr] |
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469 ... if isinstance(x, Exception): |
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470 ... raise x |
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471 ... return x |
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472 >>> def trygetfunc(tree): |
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473 ... if not tree or tree[0] != b'func' or tree[1][0] != b'symbol': |
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474 ... return None |
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475 ... if not tree[2]: |
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476 ... return tree[1][1], [] |
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477 ... if tree[2][0] == b'list': |
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478 ... return tree[1][1], list(tree[2][1:]) |
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479 ... return tree[1][1], [tree[2]] |
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480 >>> class aliasrules(basealiasrules): |
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481 ... _parse = staticmethod(parse) |
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482 ... _trygetfunc = staticmethod(trygetfunc) |
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483 >>> builddecl = aliasrules._builddecl |
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484 >>> builddecl(b'foo') |
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485 ('foo', None, None) |
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486 >>> builddecl(b'$foo') |
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487 ('$foo', None, "invalid symbol '$foo'") |
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488 >>> builddecl(b'foo::bar') |
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489 ('foo::bar', None, 'invalid format') |
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490 >>> builddecl(b'foo()') |
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491 ('foo', [], None) |
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492 >>> builddecl(b'$foo()') |
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493 ('$foo()', None, "invalid function '$foo'") |
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494 >>> builddecl(b'foo($1, $2)') |
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495 ('foo', ['$1', '$2'], None) |
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496 >>> builddecl(b'foo(bar_bar, baz.baz)') |
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497 ('foo', ['bar_bar', 'baz.baz'], None) |
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498 >>> builddecl(b'foo($1, $2, nested($1, $2))') |
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499 ('foo($1, $2, nested($1, $2))', None, 'invalid argument list') |
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500 >>> builddecl(b'foo(bar($1, $2))') |
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501 ('foo(bar($1, $2))', None, 'invalid argument list') |
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502 >>> builddecl(b'foo("bar")') |
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503 ('foo("bar")', None, 'invalid argument list') |
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504 >>> builddecl(b'foo($1, $2') |
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505 ('foo($1, $2', None, 'at 10: unexpected token: end') |
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506 >>> builddecl(b'foo("bar') |
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507 ('foo("bar', None, 'at 5: unterminated string') |
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508 >>> builddecl(b'foo($1, $2, $1)') |
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509 ('foo', None, 'argument names collide with each other') |
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510 """ |
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511 try: |
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512 tree = cls._parse(decl) |
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513 except error.ParseError as inst: |
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514 return (decl, None, parseerrordetail(inst)) |
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515 |
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516 if tree[0] == cls._symbolnode: |
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517 # "name = ...." style |
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518 name = tree[1] |
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519 if name.startswith('$'): |
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520 return (decl, None, _("invalid symbol '%s'") % name) |
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521 return (name, None, None) |
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522 |
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523 func = cls._trygetfunc(tree) |
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524 if func: |
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525 # "name(arg, ....) = ...." style |
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526 name, args = func |
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527 if name.startswith('$'): |
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528 return (decl, None, _("invalid function '%s'") % name) |
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529 if any(t[0] != cls._symbolnode for t in args): |
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530 return (decl, None, _("invalid argument list")) |
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531 if len(args) != len(set(args)): |
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532 return (name, None, _("argument names collide with each other")) |
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533 return (name, [t[1] for t in args], None) |
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534 |
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535 return (decl, None, _("invalid format")) |
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536 |
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537 @classmethod |
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538 def _relabelargs(cls, tree, args): |
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539 """Mark alias arguments as ``_aliasarg``""" |
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540 if not isinstance(tree, tuple): |
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541 return tree |
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542 op = tree[0] |
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543 if op != cls._symbolnode: |
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544 return (op,) + tuple(cls._relabelargs(x, args) for x in tree[1:]) |
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545 |
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546 assert len(tree) == 2 |
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547 sym = tree[1] |
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548 if sym in args: |
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549 op = '_aliasarg' |
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550 elif sym.startswith('$'): |
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551 raise error.ParseError(_("invalid symbol '%s'") % sym) |
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552 return (op, sym) |
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553 |
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554 @classmethod |
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555 def _builddefn(cls, defn, args): |
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556 """Parse an alias definition into a tree and marks substitutions |
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557 |
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558 This function marks alias argument references as ``_aliasarg``. The |
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559 parsing rule is provided by ``_parse()``. |
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560 |
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561 ``args`` is a list of alias argument names, or None if the alias |
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562 is declared as a symbol. |
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563 |
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564 >>> from . import pycompat |
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565 >>> parsemap = { |
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566 ... b'$1 or foo': (b'or', (b'symbol', b'$1'), (b'symbol', b'foo')), |
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567 ... b'$1 or $bar': |
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568 ... (b'or', (b'symbol', b'$1'), (b'symbol', b'$bar')), |
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569 ... b'$10 or baz': |
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570 ... (b'or', (b'symbol', b'$10'), (b'symbol', b'baz')), |
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571 ... b'"$1" or "foo"': |
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572 ... (b'or', (b'string', b'$1'), (b'string', b'foo')), |
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573 ... } |
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574 >>> class aliasrules(basealiasrules): |
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575 ... _parse = staticmethod(parsemap.__getitem__) |
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576 ... _trygetfunc = staticmethod(lambda x: None) |
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577 >>> builddefn = aliasrules._builddefn |
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578 >>> def pprint(tree): |
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579 ... s = prettyformat(tree, (b'_aliasarg', b'string', b'symbol')) |
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580 ... print(pycompat.sysstr(s)) |
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581 >>> args = [b'$1', b'$2', b'foo'] |
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582 >>> pprint(builddefn(b'$1 or foo', args)) |
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583 (or |
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584 (_aliasarg '$1') |
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585 (_aliasarg 'foo')) |
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586 >>> try: |
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587 ... builddefn(b'$1 or $bar', args) |
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588 ... except error.ParseError as inst: |
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589 ... print(pycompat.sysstr(parseerrordetail(inst))) |
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590 invalid symbol '$bar' |
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591 >>> args = [b'$1', b'$10', b'foo'] |
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592 >>> pprint(builddefn(b'$10 or baz', args)) |
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593 (or |
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594 (_aliasarg '$10') |
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595 (symbol 'baz')) |
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596 >>> pprint(builddefn(b'"$1" or "foo"', args)) |
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597 (or |
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598 (string '$1') |
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599 (string 'foo')) |
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600 """ |
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601 tree = cls._parse(defn) |
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602 if args: |
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603 args = set(args) |
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604 else: |
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605 args = set() |
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606 return cls._relabelargs(tree, args) |
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607 |
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608 @classmethod |
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609 def build(cls, decl, defn): |
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610 """Parse an alias declaration and definition into an alias object""" |
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611 repl = efmt = None |
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612 name, args, err = cls._builddecl(decl) |
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613 if err: |
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614 efmt = _('bad declaration of %(section)s "%(name)s": %(error)s') |
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615 else: |
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616 try: |
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617 repl = cls._builddefn(defn, args) |
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618 except error.ParseError as inst: |
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619 err = parseerrordetail(inst) |
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620 efmt = _('bad definition of %(section)s "%(name)s": %(error)s') |
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621 if err: |
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622 err = efmt % {'section': cls._section, 'name': name, 'error': err} |
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623 return alias(name, args, err, repl) |
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624 |
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625 @classmethod |
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626 def buildmap(cls, items): |
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627 """Parse a list of alias (name, replacement) pairs into a dict of |
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628 alias objects""" |
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629 aliases = {} |
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630 for decl, defn in items: |
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631 a = cls.build(decl, defn) |
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632 aliases[a.name] = a |
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633 return aliases |
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634 |
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635 @classmethod |
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636 def _getalias(cls, aliases, tree): |
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637 """If tree looks like an unexpanded alias, return (alias, pattern-args) |
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638 pair. Return None otherwise. |
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639 """ |
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640 if not isinstance(tree, tuple): |
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641 return None |
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642 if tree[0] == cls._symbolnode: |
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643 name = tree[1] |
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644 a = aliases.get(name) |
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645 if a and a.args is None: |
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646 return a, None |
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647 func = cls._trygetfunc(tree) |
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648 if func: |
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649 name, args = func |
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650 a = aliases.get(name) |
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651 if a and a.args is not None: |
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652 return a, args |
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653 return None |
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654 |
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655 @classmethod |
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656 def _expandargs(cls, tree, args): |
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657 """Replace _aliasarg instances with the substitution value of the |
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658 same name in args, recursively. |
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659 """ |
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660 if not isinstance(tree, tuple): |
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661 return tree |
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662 if tree[0] == '_aliasarg': |
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663 sym = tree[1] |
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664 return args[sym] |
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665 return tuple(cls._expandargs(t, args) for t in tree) |
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666 |
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667 @classmethod |
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668 def _expand(cls, aliases, tree, expanding, cache): |
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669 if not isinstance(tree, tuple): |
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670 return tree |
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671 r = cls._getalias(aliases, tree) |
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672 if r is None: |
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673 return tuple(cls._expand(aliases, t, expanding, cache) |
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674 for t in tree) |
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675 a, l = r |
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676 if a.error: |
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677 raise error.Abort(a.error) |
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678 if a in expanding: |
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679 raise error.ParseError(_('infinite expansion of %(section)s ' |
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680 '"%(name)s" detected') |
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681 % {'section': cls._section, 'name': a.name}) |
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682 # get cacheable replacement tree by expanding aliases recursively |
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683 expanding.append(a) |
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684 if a.name not in cache: |
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685 cache[a.name] = cls._expand(aliases, a.replacement, expanding, |
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686 cache) |
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687 result = cache[a.name] |
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688 expanding.pop() |
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689 if a.args is None: |
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690 return result |
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691 # substitute function arguments in replacement tree |
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692 if len(l) != len(a.args): |
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693 raise error.ParseError(_('invalid number of arguments: %d') |
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694 % len(l)) |
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695 l = [cls._expand(aliases, t, [], cache) for t in l] |
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696 return cls._expandargs(result, dict(zip(a.args, l))) |
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697 |
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698 @classmethod |
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699 def expand(cls, aliases, tree): |
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700 """Expand aliases in tree, recursively. |
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701 |
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702 'aliases' is a dictionary mapping user defined aliases to alias objects. |
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703 """ |
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704 return cls._expand(aliases, tree, [], {}) |