Mercurial > cpython-lru_cache-weakref
annotate Lib/string.py @ 3216:d00a79ebb027 legacy-trunk
Added missing imgpbm and imgsgi modules
| author | Jack Jansen <jack.jansen@cwi.nl> |
|---|---|
| date | Thu, 12 Oct 1995 10:23:27 +0000 |
| parents | 4f9d4e73057c |
| children | 70183592370e |
| rev | line source |
|---|---|
| 5 | 1 # module 'string' -- A collection of string operations |
| 2 | |
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3 # Warning: most of the code you see here isn't normally used nowadays. |
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4 # At the end of this file most functions are replaced by built-in |
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5 # functions imported from built-in module "strop". |
| 5 | 6 |
| 7 # Some strings for ctype-style character classification | |
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8 whitespace = ' \t\n\r\v\f' |
| 5 | 9 lowercase = 'abcdefghijklmnopqrstuvwxyz' |
| 10 uppercase = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' | |
| 11 letters = lowercase + uppercase | |
| 12 digits = '0123456789' | |
| 13 hexdigits = digits + 'abcdef' + 'ABCDEF' | |
| 14 octdigits = '01234567' | |
| 15 | |
| 16 # Case conversion helpers | |
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17 _idmap = '' |
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18 for i in range(256): _idmap = _idmap + chr(i) |
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19 _lower = _idmap[:ord('A')] + lowercase + _idmap[ord('Z')+1:] |
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20 _upper = _idmap[:ord('a')] + uppercase + _idmap[ord('z')+1:] |
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21 _swapcase = _upper[:ord('A')] + lowercase + _upper[ord('Z')+1:] |
| 5 | 22 del i |
| 23 | |
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24 # Backward compatible names for exceptions |
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25 index_error = ValueError |
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26 atoi_error = ValueError |
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27 atof_error = ValueError |
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28 atol_error = ValueError |
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29 |
| 5 | 30 # convert UPPER CASE letters to lower case |
| 31 def lower(s): | |
| 32 res = '' | |
| 33 for c in s: | |
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34 res = res + _lower[ord(c)] |
| 5 | 35 return res |
| 36 | |
| 37 # Convert lower case letters to UPPER CASE | |
| 38 def upper(s): | |
| 39 res = '' | |
| 40 for c in s: | |
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41 res = res + _upper[ord(c)] |
| 5 | 42 return res |
| 43 | |
| 44 # Swap lower case letters and UPPER CASE | |
| 45 def swapcase(s): | |
| 46 res = '' | |
| 47 for c in s: | |
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48 res = res + _swapcase[ord(c)] |
| 5 | 49 return res |
| 50 | |
| 51 # Strip leading and trailing tabs and spaces | |
| 52 def strip(s): | |
| 53 i, j = 0, len(s) | |
| 54 while i < j and s[i] in whitespace: i = i+1 | |
| 55 while i < j and s[j-1] in whitespace: j = j-1 | |
| 56 return s[i:j] | |
| 57 | |
| 58 # Split a string into a list of space/tab-separated words | |
| 59 # NB: split(s) is NOT the same as splitfields(s, ' ')! | |
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60 def split(s, sep=None): |
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61 if sep is not None: return splitfields(s, sep) |
| 5 | 62 res = [] |
| 63 i, n = 0, len(s) | |
| 64 while i < n: | |
| 65 while i < n and s[i] in whitespace: i = i+1 | |
| 559 | 66 if i == n: break |
| 5 | 67 j = i |
| 68 while j < n and s[j] not in whitespace: j = j+1 | |
| 69 res.append(s[i:j]) | |
| 70 i = j | |
| 71 return res | |
| 72 | |
| 73 # Split a list into fields separated by a given string | |
| 74 # NB: splitfields(s, ' ') is NOT the same as split(s)! | |
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75 # splitfields(s, '') returns [s] (in analogy with split() in nawk) |
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76 def splitfields(s, sep=None): |
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77 if sep is None: return split(s) |
| 5 | 78 res = [] |
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79 nsep = len(sep) |
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80 if nsep == 0: |
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81 return [s] |
| 5 | 82 ns = len(s) |
| 83 i = j = 0 | |
| 84 while j+nsep <= ns: | |
| 559 | 85 if s[j:j+nsep] == sep: |
| 5 | 86 res.append(s[i:j]) |
| 87 i = j = j + nsep | |
| 88 else: | |
| 89 j = j + 1 | |
| 90 res.append(s[i:]) | |
| 91 return res | |
| 92 | |
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93 # Join words with spaces between them |
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94 def join(words, sep = ' '): |
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95 return joinfields(words, sep) |
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96 |
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97 # Join fields with optional separator |
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98 def joinfields(words, sep = ' '): |
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99 res = '' |
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100 for w in words: |
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101 res = res + (sep + w) |
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102 return res[len(sep):] |
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103 |
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104 # Find substring, raise exception if not found |
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105 def index(s, sub, i = 0): |
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106 res = find(s, sub, i) |
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107 if res < 0: |
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108 raise ValueError, 'substring not found in string.index' |
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109 return res |
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110 |
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111 # Find last substring, raise exception if not found |
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112 def rindex(s, sub, i = 0): |
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113 res = rfind(s, sub, i) |
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114 if res < 0: |
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115 raise ValueError, 'substring not found in string.index' |
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116 return res |
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117 |
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118 # Count non-overlapping occurrences of substring |
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119 def count(s, sub, i = 0): |
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120 if i < 0: i = max(0, i + len(s)) |
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121 n = len(sub) |
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122 m = len(s) + 1 - n |
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123 if n == 0: return m-i |
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124 r = 0 |
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125 while i < m: |
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126 if sub == s[i:i+n]: |
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127 r = r+1 |
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128 i = i+n |
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129 else: |
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130 i = i+1 |
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131 return r |
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132 |
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133 # Find substring, return -1 if not found |
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134 def find(s, sub, i = 0): |
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135 if i < 0: i = max(0, i + len(s)) |
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136 n = len(sub) |
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137 m = len(s) + 1 - n |
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138 while i < m: |
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139 if sub == s[i:i+n]: return i |
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140 i = i+1 |
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141 return -1 |
| 5 | 142 |
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143 # Find last substring, return -1 if not found |
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144 def rfind(s, sub, i = 0): |
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145 if i < 0: i = max(0, i + len(s)) |
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146 n = len(sub) |
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147 m = len(s) + 1 - n |
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148 r = -1 |
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149 while i < m: |
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150 if sub == s[i:i+n]: r = i |
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151 i = i+1 |
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152 return r |
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153 |
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154 # Convert string to float |
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155 def atof(str): |
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156 import regex |
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157 sign = '' |
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158 s = str |
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159 if s and s[0] in '+-': |
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160 sign = s[0] |
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161 s = s[1:] |
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162 if not s: |
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163 raise ValueError, 'non-float argument to string.atof' |
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164 while s[0] == '0' and len(s) > 1 and s[1] in digits: s = s[1:] |
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165 if regex.match('[0-9]*\(\.[0-9]*\)?\([eE][-+]?[0-9]+\)?', s) != len(s): |
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166 raise ValueError, 'non-float argument to string.atof' |
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167 try: |
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168 return float(eval(sign + s)) |
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169 except SyntaxError: |
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170 raise ValueError, 'non-float argument to string.atof' |
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171 |
| 5 | 172 # Convert string to integer |
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173 def atoi(str, base=10): |
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174 if base != 10: |
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175 # We only get here if strop doesn't define atoi() |
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176 raise ValueError, "this string.atoi doesn't support base != 10" |
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177 sign = '' |
| 5 | 178 s = str |
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179 if s and s[0] in '+-': |
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180 sign = s[0] |
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181 s = s[1:] |
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182 if not s: |
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183 raise ValueError, 'non-integer argument to string.atoi' |
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184 while s[0] == '0' and len(s) > 1: s = s[1:] |
| 5 | 185 for c in s: |
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186 if c not in digits: |
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187 raise ValueError, 'non-integer argument to string.atoi' |
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188 return eval(sign + s) |
| 5 | 189 |
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190 # Convert string to long integer |
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191 def atol(str, base=10): |
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192 if base != 10: |
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193 # We only get here if strop doesn't define atol() |
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194 raise ValueError, "this string.atol doesn't support base != 10" |
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195 sign = '' |
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196 s = str |
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197 if s and s[0] in '+-': |
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198 sign = s[0] |
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199 s = s[1:] |
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200 if not s: |
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201 raise ValueError, 'non-integer argument to string.atol' |
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202 while s[0] == '0' and len(s) > 1: s = s[1:] |
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203 for c in s: |
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204 if c not in digits: |
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205 raise ValueError, 'non-integer argument to string.atol' |
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206 return eval(sign + s + 'L') |
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207 |
| 5 | 208 # Left-justify a string |
| 209 def ljust(s, width): | |
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210 n = width - len(s) |
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211 if n <= 0: return s |
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212 return s + ' '*n |
| 5 | 213 |
| 214 # Right-justify a string | |
| 215 def rjust(s, width): | |
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216 n = width - len(s) |
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217 if n <= 0: return s |
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218 return ' '*n + s |
| 5 | 219 |
| 220 # Center a string | |
| 221 def center(s, width): | |
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222 n = width - len(s) |
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223 if n <= 0: return s |
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224 half = n/2 |
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225 if n%2 and width%2: |
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226 # This ensures that center(center(s, i), j) = center(s, j) |
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227 half = half+1 |
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228 return ' '*half + s + ' '*(n-half) |
| 5 | 229 |
| 230 # Zero-fill a number, e.g., (12, 3) --> '012' and (-3, 3) --> '-03' | |
| 231 # Decadent feature: the argument may be a string or a number | |
| 232 # (Use of this is deprecated; it should be a string as with ljust c.s.) | |
| 233 def zfill(x, width): | |
| 559 | 234 if type(x) == type(''): s = x |
| 5 | 235 else: s = `x` |
| 236 n = len(s) | |
| 237 if n >= width: return s | |
| 238 sign = '' | |
| 365 | 239 if s[0] in ('-', '+'): |
| 240 sign, s = s[0], s[1:] | |
| 5 | 241 return sign + '0'*(width-n) + s |
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242 |
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243 # Expand tabs in a string. |
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244 # Doesn't take non-printing chars into account, but does understand \n. |
| 2958 | 245 def expandtabs(s, tabsize=8): |
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246 res = line = '' |
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247 for c in s: |
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248 if c == '\t': |
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249 c = ' '*(tabsize - len(line)%tabsize) |
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250 line = line + c |
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251 if c == '\n': |
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252 res = res + line |
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253 line = '' |
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254 return res + line |
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255 |
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256 |
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257 # Try importing optional built-in module "strop" -- if it exists, |
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258 # it redefines some string operations that are 100-1000 times faster. |
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259 # It also defines values for whitespace, lowercase and uppercase |
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260 # that match <ctype.h>'s definitions. |
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261 |
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262 try: |
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263 from strop import * |
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264 letters = lowercase + uppercase |
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265 except ImportError: |
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266 pass # Use the original, slow versions |