Mercurial > hg
annotate mercurial/filesetlang.py @ 47532:ccbabaee5c36
dirstate-entry: add a `need_delay` method
This abstract the internal processing need for entry that would have an
ambiguous mtime (If I understand things correctly).
Differential Revision: https://phab.mercurial-scm.org/D10974
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Sun, 04 Jul 2021 02:13:53 +0200 |
parents | d4ba4d51f85f |
children | 6000f5b25c9b |
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1 # filesetlang.py - parser, tokenizer and utility for file set language |
11275 | 2 # |
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3 # Copyright 2010 Olivia Mackall <olivia@selenic.com> |
11275 | 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 from __future__ import absolute_import |
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9 |
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10 from .i18n import _ |
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11 from .pycompat import getattr |
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12 from . import ( |
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13 error, |
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14 parser, |
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15 pycompat, |
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16 ) |
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18 # common weight constants for static optimization |
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19 # (see registrar.filesetpredicate for details) |
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20 WEIGHT_CHECK_FILENAME = 0.5 |
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21 WEIGHT_READ_CONTENTS = 30 |
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22 WEIGHT_STATUS = 10 |
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23 WEIGHT_STATUS_THOROUGH = 50 |
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24 |
11275 | 25 elements = { |
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26 # token-type: binding-strength, primary, prefix, infix, suffix |
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27 b"(": (20, None, (b"group", 1, b")"), (b"func", 1, b")"), None), |
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28 b":": (15, None, None, (b"kindpat", 15), None), |
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29 b"-": (5, None, (b"negate", 19), (b"minus", 5), None), |
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30 b"not": (10, None, (b"not", 10), None, None), |
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31 b"!": (10, None, (b"not", 10), None, None), |
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32 b"and": (5, None, None, (b"and", 5), None), |
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33 b"&": (5, None, None, (b"and", 5), None), |
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34 b"or": (4, None, None, (b"or", 4), None), |
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35 b"|": (4, None, None, (b"or", 4), None), |
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36 b"+": (4, None, None, (b"or", 4), None), |
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37 b",": (2, None, None, (b"list", 2), None), |
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38 b")": (0, None, None, None, None), |
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39 b"symbol": (0, b"symbol", None, None, None), |
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40 b"string": (0, b"string", None, None, None), |
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41 b"end": (0, None, None, None, None), |
11275 | 42 } |
43 | |
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44 keywords = {b'and', b'or', b'not'} |
11275 | 45 |
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46 symbols = {} |
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47 |
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48 globchars = b".*{}[]?/\\_" |
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49 |
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50 |
11275 | 51 def tokenize(program): |
52 pos, l = 0, len(program) | |
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53 program = pycompat.bytestr(program) |
11275 | 54 while pos < l: |
55 c = program[pos] | |
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56 if c.isspace(): # skip inter-token whitespace |
11275 | 57 pass |
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58 elif c in b"(),-:|&+!": # handle simple operators |
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59 yield (c, None, pos) |
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60 elif ( |
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61 c in b'"\'' |
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62 or c == b'r' |
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63 and program[pos : pos + 2] in (b"r'", b'r"') |
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64 ): # handle quoted strings |
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65 if c == b'r': |
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66 pos += 1 |
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67 c = program[pos] |
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68 decode = lambda x: x |
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69 else: |
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70 decode = parser.unescapestr |
11275 | 71 pos += 1 |
72 s = pos | |
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73 while pos < l: # find closing quote |
11275 | 74 d = program[pos] |
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75 if d == b'\\': # skip over escaped characters |
11275 | 76 pos += 2 |
77 continue | |
78 if d == c: | |
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79 yield (b'string', decode(program[s:pos]), s) |
11275 | 80 break |
81 pos += 1 | |
82 else: | |
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83 raise error.ParseError(_(b"unterminated string"), s) |
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84 elif c.isalnum() or c in globchars or ord(c) > 127: |
14513 | 85 # gather up a symbol/keyword |
11275 | 86 s = pos |
87 pos += 1 | |
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88 while pos < l: # find end of symbol |
11275 | 89 d = program[pos] |
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90 if not (d.isalnum() or d in globchars or ord(d) > 127): |
11275 | 91 break |
92 pos += 1 | |
93 sym = program[s:pos] | |
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94 if sym in keywords: # operator keywords |
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95 yield (sym, None, s) |
11275 | 96 else: |
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97 yield (b'symbol', sym, s) |
11275 | 98 pos -= 1 |
99 else: | |
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100 raise error.ParseError(_(b"syntax error"), pos) |
11275 | 101 pos += 1 |
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102 yield (b'end', None, pos) |
11275 | 103 |
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104 |
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105 def parse(expr): |
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106 p = parser.parser(elements) |
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107 tree, pos = p.parse(tokenize(expr)) |
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108 if pos != len(expr): |
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109 raise error.ParseError(_(b"invalid token"), pos) |
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110 return parser.simplifyinfixops(tree, {b'list', b'or'}) |
11275 | 111 |
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112 |
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113 def getsymbol(x): |
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114 if x and x[0] == b'symbol': |
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115 return x[1] |
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116 raise error.ParseError(_(b'not a symbol')) |
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117 |
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118 |
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119 def getstring(x, err): |
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120 if x and (x[0] == b'string' or x[0] == b'symbol'): |
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121 return x[1] |
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122 raise error.ParseError(err) |
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123 |
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124 |
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125 def getkindpat(x, y, allkinds, err): |
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126 kind = getsymbol(x) |
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127 pat = getstring(y, err) |
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128 if kind not in allkinds: |
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129 raise error.ParseError(_(b"invalid pattern kind: %s") % kind) |
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130 return b'%s:%s' % (kind, pat) |
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131 |
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132 |
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133 def getpattern(x, allkinds, err): |
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134 if x and x[0] == b'kindpat': |
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135 return getkindpat(x[1], x[2], allkinds, err) |
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136 return getstring(x, err) |
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137 |
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138 |
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139 def getlist(x): |
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140 if not x: |
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141 return [] |
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142 if x[0] == b'list': |
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143 return list(x[1:]) |
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144 return [x] |
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145 |
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146 |
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147 def getargs(x, min, max, err): |
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148 l = getlist(x) |
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149 if len(l) < min or len(l) > max: |
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150 raise error.ParseError(err) |
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151 return l |
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152 |
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153 |
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154 def _analyze(x): |
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155 if x is None: |
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156 return x |
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157 |
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158 op = x[0] |
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159 if op in {b'string', b'symbol'}: |
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160 return x |
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161 if op == b'kindpat': |
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162 getsymbol(x[1]) # kind must be a symbol |
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163 t = _analyze(x[2]) |
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164 return (op, x[1], t) |
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165 if op == b'group': |
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166 return _analyze(x[1]) |
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167 if op == b'negate': |
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168 raise error.ParseError(_(b"can't use negate operator in this context")) |
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169 if op == b'not': |
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170 t = _analyze(x[1]) |
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171 return (op, t) |
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172 if op == b'and': |
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173 ta = _analyze(x[1]) |
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174 tb = _analyze(x[2]) |
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175 return (op, ta, tb) |
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176 if op == b'minus': |
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177 return _analyze((b'and', x[1], (b'not', x[2]))) |
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178 if op in {b'list', b'or'}: |
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179 ts = tuple(_analyze(y) for y in x[1:]) |
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180 return (op,) + ts |
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181 if op == b'func': |
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182 getsymbol(x[1]) # function name must be a symbol |
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183 ta = _analyze(x[2]) |
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184 return (op, x[1], ta) |
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185 raise error.ProgrammingError(b'invalid operator %r' % op) |
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186 |
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187 |
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188 def _insertstatushints(x): |
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189 """Insert hint nodes where status should be calculated (first path) |
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190 |
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191 This works in bottom-up way, summing up status names and inserting hint |
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192 nodes at 'and' and 'or' as needed. Thus redundant hint nodes may be left. |
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193 |
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194 Returns (status-names, new-tree) at the given subtree, where status-names |
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195 is a sum of status names referenced in the given subtree. |
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196 """ |
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197 if x is None: |
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198 return (), x |
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199 |
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200 op = x[0] |
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201 if op in {b'string', b'symbol', b'kindpat'}: |
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202 return (), x |
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203 if op == b'not': |
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204 h, t = _insertstatushints(x[1]) |
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205 return h, (op, t) |
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206 if op == b'and': |
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207 ha, ta = _insertstatushints(x[1]) |
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208 hb, tb = _insertstatushints(x[2]) |
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209 hr = ha + hb |
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210 if ha and hb: |
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211 return hr, (b'withstatus', (op, ta, tb), (b'string', b' '.join(hr))) |
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212 return hr, (op, ta, tb) |
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213 if op == b'or': |
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214 hs, ts = zip(*(_insertstatushints(y) for y in x[1:])) |
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215 hr = sum(hs, ()) |
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216 if sum(bool(h) for h in hs) > 1: |
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217 return hr, (b'withstatus', (op,) + ts, (b'string', b' '.join(hr))) |
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218 return hr, (op,) + ts |
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219 if op == b'list': |
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220 hs, ts = zip(*(_insertstatushints(y) for y in x[1:])) |
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221 return sum(hs, ()), (op,) + ts |
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222 if op == b'func': |
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223 f = getsymbol(x[1]) |
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224 # don't propagate 'ha' crossing a function boundary |
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225 ha, ta = _insertstatushints(x[2]) |
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226 if getattr(symbols.get(f), '_callstatus', False): |
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227 return (f,), (b'withstatus', (op, x[1], ta), (b'string', f)) |
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228 return (), (op, x[1], ta) |
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229 raise error.ProgrammingError(b'invalid operator %r' % op) |
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230 |
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231 |
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232 def _mergestatushints(x, instatus): |
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233 """Remove redundant status hint nodes (second path) |
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234 |
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235 This is the top-down path to eliminate inner hint nodes. |
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236 """ |
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237 if x is None: |
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238 return x |
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239 |
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240 op = x[0] |
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241 if op == b'withstatus': |
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242 if instatus: |
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243 # drop redundant hint node |
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244 return _mergestatushints(x[1], instatus) |
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245 t = _mergestatushints(x[1], instatus=True) |
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246 return (op, t, x[2]) |
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247 if op in {b'string', b'symbol', b'kindpat'}: |
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248 return x |
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249 if op == b'not': |
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250 t = _mergestatushints(x[1], instatus) |
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251 return (op, t) |
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252 if op == b'and': |
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253 ta = _mergestatushints(x[1], instatus) |
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254 tb = _mergestatushints(x[2], instatus) |
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255 return (op, ta, tb) |
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256 if op in {b'list', b'or'}: |
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257 ts = tuple(_mergestatushints(y, instatus) for y in x[1:]) |
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258 return (op,) + ts |
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259 if op == b'func': |
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260 # don't propagate 'instatus' crossing a function boundary |
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261 ta = _mergestatushints(x[2], instatus=False) |
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262 return (op, x[1], ta) |
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263 raise error.ProgrammingError(b'invalid operator %r' % op) |
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264 |
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265 |
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266 def analyze(x): |
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267 """Transform raw parsed tree to evaluatable tree which can be fed to |
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268 optimize() or getmatch() |
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269 |
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270 All pseudo operations should be mapped to real operations or functions |
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271 defined in methods or symbols table respectively. |
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272 """ |
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273 t = _analyze(x) |
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274 _h, t = _insertstatushints(t) |
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275 return _mergestatushints(t, instatus=False) |
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276 |
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277 |
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278 def _optimizeandops(op, ta, tb): |
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279 if tb is not None and tb[0] == b'not': |
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280 return (b'minus', ta, tb[1]) |
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281 return (op, ta, tb) |
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282 |
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283 |
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284 def _optimizeunion(xs): |
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285 # collect string patterns so they can be compiled into a single regexp |
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286 ws, ts, ss = [], [], [] |
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287 for x in xs: |
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288 w, t = _optimize(x) |
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289 if t is not None and t[0] in {b'string', b'symbol', b'kindpat'}: |
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290 ss.append(t) |
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291 continue |
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292 ws.append(w) |
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293 ts.append(t) |
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294 if ss: |
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295 ws.append(WEIGHT_CHECK_FILENAME) |
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296 ts.append((b'patterns',) + tuple(ss)) |
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297 return ws, ts |
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298 |
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299 |
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300 def _optimize(x): |
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301 if x is None: |
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302 return 0, x |
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303 |
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304 op = x[0] |
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305 if op == b'withstatus': |
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306 w, t = _optimize(x[1]) |
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307 return w, (op, t, x[2]) |
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308 if op in {b'string', b'symbol'}: |
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309 return WEIGHT_CHECK_FILENAME, x |
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310 if op == b'kindpat': |
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311 w, t = _optimize(x[2]) |
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312 return w, (op, x[1], t) |
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313 if op == b'not': |
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314 w, t = _optimize(x[1]) |
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315 return w, (op, t) |
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316 if op == b'and': |
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317 wa, ta = _optimize(x[1]) |
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318 wb, tb = _optimize(x[2]) |
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319 if wa <= wb: |
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320 return wa, _optimizeandops(op, ta, tb) |
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321 else: |
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322 return wb, _optimizeandops(op, tb, ta) |
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323 if op == b'or': |
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324 ws, ts = _optimizeunion(x[1:]) |
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325 if len(ts) == 1: |
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326 return ws[0], ts[0] # 'or' operation is fully optimized out |
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327 ts = tuple( |
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328 it[1] for it in sorted(enumerate(ts), key=lambda it: ws[it[0]]) |
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329 ) |
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330 return max(ws), (op,) + ts |
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331 if op == b'list': |
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332 ws, ts = zip(*(_optimize(y) for y in x[1:])) |
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333 return sum(ws), (op,) + ts |
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334 if op == b'func': |
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335 f = getsymbol(x[1]) |
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336 w = getattr(symbols.get(f), '_weight', 1) |
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337 wa, ta = _optimize(x[2]) |
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338 return w + wa, (op, x[1], ta) |
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339 raise error.ProgrammingError(b'invalid operator %r' % op) |
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340 |
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341 |
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342 def optimize(x): |
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343 """Reorder/rewrite evaluatable tree for optimization |
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344 |
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345 All pseudo operations should be transformed beforehand. |
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346 """ |
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347 _w, t = _optimize(x) |
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348 return t |
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349 |
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350 |
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351 def prettyformat(tree): |
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352 return parser.prettyformat(tree, (b'string', b'symbol')) |