Mercurial > hg
annotate mercurial/filesetlang.py @ 50896:b2b8c25f9462
hgwebmod: use sysstr to check for attribute presence
We do not need bytes here.
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Wed, 30 Aug 2023 13:28:09 +0200 |
parents | 6000f5b25c9b |
children | 18c8c18993f0 |
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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 |
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9 from .i18n import _ |
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10 from .pycompat import getattr |
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11 from . import ( |
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12 error, |
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13 parser, |
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14 pycompat, |
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15 ) |
11275 | 16 |
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17 # common weight constants for static optimization |
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18 # (see registrar.filesetpredicate for details) |
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19 WEIGHT_CHECK_FILENAME = 0.5 |
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20 WEIGHT_READ_CONTENTS = 30 |
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21 WEIGHT_STATUS = 10 |
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22 WEIGHT_STATUS_THOROUGH = 50 |
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23 |
11275 | 24 elements = { |
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25 # token-type: binding-strength, primary, prefix, infix, suffix |
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26 b"(": (20, None, (b"group", 1, b")"), (b"func", 1, b")"), None), |
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27 b":": (15, None, None, (b"kindpat", 15), None), |
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28 b"-": (5, None, (b"negate", 19), (b"minus", 5), None), |
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29 b"not": (10, None, (b"not", 10), None, None), |
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30 b"!": (10, None, (b"not", 10), None, None), |
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31 b"and": (5, None, None, (b"and", 5), None), |
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32 b"&": (5, None, None, (b"and", 5), None), |
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33 b"or": (4, None, None, (b"or", 4), None), |
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34 b"|": (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",": (2, None, None, (b"list", 2), None), |
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37 b")": (0, None, None, None, None), |
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38 b"symbol": (0, b"symbol", None, None, None), |
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39 b"string": (0, b"string", None, None, None), |
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40 b"end": (0, None, None, None, None), |
11275 | 41 } |
42 | |
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43 keywords = {b'and', b'or', b'not'} |
11275 | 44 |
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45 symbols = {} |
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46 |
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47 globchars = b".*{}[]?/\\_" |
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48 |
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49 |
11275 | 50 def tokenize(program): |
51 pos, l = 0, len(program) | |
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52 program = pycompat.bytestr(program) |
11275 | 53 while pos < l: |
54 c = program[pos] | |
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55 if c.isspace(): # skip inter-token whitespace |
11275 | 56 pass |
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57 elif c in b"(),-:|&+!": # handle simple operators |
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58 yield (c, None, pos) |
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59 elif ( |
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60 c in b'"\'' |
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61 or c == b'r' |
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62 and program[pos : pos + 2] in (b"r'", b'r"') |
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63 ): # handle quoted strings |
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64 if c == b'r': |
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65 pos += 1 |
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66 c = program[pos] |
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67 decode = lambda x: x |
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68 else: |
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69 decode = parser.unescapestr |
11275 | 70 pos += 1 |
71 s = pos | |
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72 while pos < l: # find closing quote |
11275 | 73 d = program[pos] |
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74 if d == b'\\': # skip over escaped characters |
11275 | 75 pos += 2 |
76 continue | |
77 if d == c: | |
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78 yield (b'string', decode(program[s:pos]), s) |
11275 | 79 break |
80 pos += 1 | |
81 else: | |
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82 raise error.ParseError(_(b"unterminated string"), s) |
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83 elif c.isalnum() or c in globchars or ord(c) > 127: |
14513 | 84 # gather up a symbol/keyword |
11275 | 85 s = pos |
86 pos += 1 | |
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87 while pos < l: # find end of symbol |
11275 | 88 d = program[pos] |
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89 if not (d.isalnum() or d in globchars or ord(d) > 127): |
11275 | 90 break |
91 pos += 1 | |
92 sym = program[s:pos] | |
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93 if sym in keywords: # operator keywords |
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94 yield (sym, None, s) |
11275 | 95 else: |
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96 yield (b'symbol', sym, s) |
11275 | 97 pos -= 1 |
98 else: | |
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99 raise error.ParseError(_(b"syntax error"), pos) |
11275 | 100 pos += 1 |
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101 yield (b'end', None, pos) |
11275 | 102 |
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103 |
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104 def parse(expr): |
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105 p = parser.parser(elements) |
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106 tree, pos = p.parse(tokenize(expr)) |
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107 if pos != len(expr): |
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108 raise error.ParseError(_(b"invalid token"), pos) |
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109 return parser.simplifyinfixops(tree, {b'list', b'or'}) |
11275 | 110 |
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111 |
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112 def getsymbol(x): |
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113 if x and x[0] == b'symbol': |
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114 return x[1] |
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115 raise error.ParseError(_(b'not a symbol')) |
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116 |
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117 |
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118 def getstring(x, err): |
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119 if x and (x[0] == b'string' or x[0] == b'symbol'): |
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120 return x[1] |
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121 raise error.ParseError(err) |
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122 |
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123 |
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124 def getkindpat(x, y, allkinds, err): |
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125 kind = getsymbol(x) |
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126 pat = getstring(y, err) |
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127 if kind not in allkinds: |
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128 raise error.ParseError(_(b"invalid pattern kind: %s") % kind) |
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129 return b'%s:%s' % (kind, pat) |
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130 |
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131 |
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132 def getpattern(x, allkinds, err): |
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133 if x and x[0] == b'kindpat': |
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134 return getkindpat(x[1], x[2], allkinds, err) |
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135 return getstring(x, err) |
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136 |
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137 |
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138 def getlist(x): |
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139 if not x: |
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140 return [] |
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141 if x[0] == b'list': |
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142 return list(x[1:]) |
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143 return [x] |
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144 |
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145 |
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146 def getargs(x, min, max, err): |
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147 l = getlist(x) |
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148 if len(l) < min or len(l) > max: |
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149 raise error.ParseError(err) |
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150 return l |
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151 |
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152 |
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153 def _analyze(x): |
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154 if x is None: |
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155 return x |
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156 |
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157 op = x[0] |
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158 if op in {b'string', b'symbol'}: |
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159 return x |
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160 if op == b'kindpat': |
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161 getsymbol(x[1]) # kind must be a symbol |
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162 t = _analyze(x[2]) |
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163 return (op, x[1], t) |
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164 if op == b'group': |
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165 return _analyze(x[1]) |
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166 if op == b'negate': |
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167 raise error.ParseError(_(b"can't use negate operator in this context")) |
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168 if op == b'not': |
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169 t = _analyze(x[1]) |
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170 return (op, t) |
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171 if op == b'and': |
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172 ta = _analyze(x[1]) |
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173 tb = _analyze(x[2]) |
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174 return (op, ta, tb) |
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175 if op == b'minus': |
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176 return _analyze((b'and', x[1], (b'not', x[2]))) |
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177 if op in {b'list', b'or'}: |
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178 ts = tuple(_analyze(y) for y in x[1:]) |
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179 return (op,) + ts |
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180 if op == b'func': |
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181 getsymbol(x[1]) # function name must be a symbol |
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182 ta = _analyze(x[2]) |
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183 return (op, x[1], ta) |
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184 raise error.ProgrammingError(b'invalid operator %r' % op) |
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185 |
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186 |
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187 def _insertstatushints(x): |
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188 """Insert hint nodes where status should be calculated (first path) |
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189 |
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190 This works in bottom-up way, summing up status names and inserting hint |
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191 nodes at 'and' and 'or' as needed. Thus redundant hint nodes may be left. |
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192 |
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193 Returns (status-names, new-tree) at the given subtree, where status-names |
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194 is a sum of status names referenced in the given subtree. |
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195 """ |
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196 if x is None: |
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197 return (), x |
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198 |
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199 op = x[0] |
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200 if op in {b'string', b'symbol', b'kindpat'}: |
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201 return (), x |
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202 if op == b'not': |
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203 h, t = _insertstatushints(x[1]) |
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204 return h, (op, t) |
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205 if op == b'and': |
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206 ha, ta = _insertstatushints(x[1]) |
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207 hb, tb = _insertstatushints(x[2]) |
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208 hr = ha + hb |
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209 if ha and hb: |
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210 return hr, (b'withstatus', (op, ta, tb), (b'string', b' '.join(hr))) |
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211 return hr, (op, ta, tb) |
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212 if op == b'or': |
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213 hs, ts = zip(*(_insertstatushints(y) for y in x[1:])) |
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214 hr = sum(hs, ()) |
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215 if sum(bool(h) for h in hs) > 1: |
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216 return hr, (b'withstatus', (op,) + ts, (b'string', b' '.join(hr))) |
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217 return hr, (op,) + ts |
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218 if op == b'list': |
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219 hs, ts = zip(*(_insertstatushints(y) for y in x[1:])) |
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220 return sum(hs, ()), (op,) + ts |
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221 if op == b'func': |
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222 f = getsymbol(x[1]) |
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223 # don't propagate 'ha' crossing a function boundary |
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224 ha, ta = _insertstatushints(x[2]) |
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225 if getattr(symbols.get(f), '_callstatus', False): |
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226 return (f,), (b'withstatus', (op, x[1], ta), (b'string', f)) |
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227 return (), (op, x[1], ta) |
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228 raise error.ProgrammingError(b'invalid operator %r' % op) |
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229 |
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230 |
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231 def _mergestatushints(x, instatus): |
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232 """Remove redundant status hint nodes (second path) |
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233 |
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234 This is the top-down path to eliminate inner hint nodes. |
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235 """ |
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236 if x is None: |
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237 return x |
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238 |
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239 op = x[0] |
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240 if op == b'withstatus': |
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241 if instatus: |
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242 # drop redundant hint node |
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243 return _mergestatushints(x[1], instatus) |
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244 t = _mergestatushints(x[1], instatus=True) |
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245 return (op, t, x[2]) |
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246 if op in {b'string', b'symbol', b'kindpat'}: |
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247 return x |
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248 if op == b'not': |
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249 t = _mergestatushints(x[1], instatus) |
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250 return (op, t) |
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251 if op == b'and': |
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252 ta = _mergestatushints(x[1], instatus) |
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253 tb = _mergestatushints(x[2], instatus) |
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254 return (op, ta, tb) |
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255 if op in {b'list', b'or'}: |
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256 ts = tuple(_mergestatushints(y, instatus) for y in x[1:]) |
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257 return (op,) + ts |
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258 if op == b'func': |
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259 # don't propagate 'instatus' crossing a function boundary |
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260 ta = _mergestatushints(x[2], instatus=False) |
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261 return (op, x[1], ta) |
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262 raise error.ProgrammingError(b'invalid operator %r' % op) |
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263 |
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264 |
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265 def analyze(x): |
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266 """Transform raw parsed tree to evaluatable tree which can be fed to |
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267 optimize() or getmatch() |
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268 |
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269 All pseudo operations should be mapped to real operations or functions |
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270 defined in methods or symbols table respectively. |
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271 """ |
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272 t = _analyze(x) |
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273 _h, t = _insertstatushints(t) |
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274 return _mergestatushints(t, instatus=False) |
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275 |
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276 |
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277 def _optimizeandops(op, ta, tb): |
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278 if tb is not None and tb[0] == b'not': |
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279 return (b'minus', ta, tb[1]) |
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280 return (op, ta, tb) |
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281 |
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282 |
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283 def _optimizeunion(xs): |
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284 # collect string patterns so they can be compiled into a single regexp |
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285 ws, ts, ss = [], [], [] |
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286 for x in xs: |
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287 w, t = _optimize(x) |
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288 if t is not None and t[0] in {b'string', b'symbol', b'kindpat'}: |
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289 ss.append(t) |
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290 continue |
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291 ws.append(w) |
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292 ts.append(t) |
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293 if ss: |
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294 ws.append(WEIGHT_CHECK_FILENAME) |
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295 ts.append((b'patterns',) + tuple(ss)) |
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296 return ws, ts |
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297 |
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298 |
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299 def _optimize(x): |
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300 if x is None: |
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301 return 0, x |
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302 |
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303 op = x[0] |
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304 if op == b'withstatus': |
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305 w, t = _optimize(x[1]) |
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306 return w, (op, t, x[2]) |
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307 if op in {b'string', b'symbol'}: |
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308 return WEIGHT_CHECK_FILENAME, x |
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309 if op == b'kindpat': |
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310 w, t = _optimize(x[2]) |
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311 return w, (op, x[1], t) |
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312 if op == b'not': |
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313 w, t = _optimize(x[1]) |
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314 return w, (op, t) |
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315 if op == b'and': |
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316 wa, ta = _optimize(x[1]) |
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317 wb, tb = _optimize(x[2]) |
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318 if wa <= wb: |
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319 return wa, _optimizeandops(op, ta, tb) |
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320 else: |
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321 return wb, _optimizeandops(op, tb, ta) |
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322 if op == b'or': |
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323 ws, ts = _optimizeunion(x[1:]) |
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324 if len(ts) == 1: |
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325 return ws[0], ts[0] # 'or' operation is fully optimized out |
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326 ts = tuple( |
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327 it[1] for it in sorted(enumerate(ts), key=lambda it: ws[it[0]]) |
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328 ) |
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329 return max(ws), (op,) + ts |
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330 if op == b'list': |
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331 ws, ts = zip(*(_optimize(y) for y in x[1:])) |
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332 return sum(ws), (op,) + ts |
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333 if op == b'func': |
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334 f = getsymbol(x[1]) |
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335 w = getattr(symbols.get(f), '_weight', 1) |
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336 wa, ta = _optimize(x[2]) |
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337 return w + wa, (op, x[1], ta) |
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338 raise error.ProgrammingError(b'invalid operator %r' % op) |
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339 |
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340 |
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341 def optimize(x): |
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342 """Reorder/rewrite evaluatable tree for optimization |
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343 |
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344 All pseudo operations should be transformed beforehand. |
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345 """ |
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346 _w, t = _optimize(x) |
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347 return t |
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348 |
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349 |
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350 def prettyformat(tree): |
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351 return parser.prettyformat(tree, (b'string', b'symbol')) |