Mercurial > hg > octave-lyh
annotate scripts/general/genvarname.m @ 17508:9b2443f97a3e
Merge the official development
| author | LYH <lyh.kernel@gmail.com> |
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| date | Thu, 26 Sep 2013 04:47:20 +0800 |
| parents | bc924baa2c4e |
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| rev | line source |
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1 ## Copyright (C) 2008-2012 Bill Denney, Robert Platt |
| 7657 | 2 ## |
| 3 ## This file is part of Octave. | |
| 4 ## | |
| 5 ## Octave is free software; you can redistribute it and/or modify it | |
| 6 ## under the terms of the GNU General Public License as published by | |
| 7 ## the Free Software Foundation; either version 3 of the License, or (at | |
| 8 ## your option) any later version. | |
| 9 ## | |
| 10 ## Octave is distributed in the hope that it will be useful, but | |
| 11 ## WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 ## General Public License for more details. | |
| 14 ## | |
| 15 ## You should have received a copy of the GNU General Public License | |
| 16 ## along with Octave; see the file COPYING. If not, see | |
| 17 ## <http://www.gnu.org/licenses/>. | |
| 18 | |
| 19 ## -*- texinfo -*- | |
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20 ## @deftypefn {Function File} {@var{varname} =} genvarname (@var{str}) |
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21 ## @deftypefnx {Function File} {@var{varname} =} genvarname (@var{str}, @var{exclusions}) |
| 7657 | 22 ## Create unique variable(s) from @var{str}. If @var{exclusions} is |
| 23 ## given, then the variable(s) will be unique to each other and to | |
| 24 ## @var{exclusions} (@var{exclusions} may be either a string or a cellstr). | |
| 25 ## | |
| 26 ## If @var{str} is a cellstr, then a unique variable is created for each | |
| 27 ## cell in @var{str}. | |
| 28 ## | |
| 29 ## @example | |
| 30 ## @group | |
| 31 ## x = 3.141; | |
| 32 ## genvarname ("x", who ()) | |
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33 ## @result{} x1 |
| 7657 | 34 ## @end group |
| 35 ## @end example | |
| 36 ## | |
| 37 ## If @var{wanted} is a cell array, genvarname will make sure the returned | |
| 38 ## strings are distinct: | |
| 39 ## | |
| 40 ## @example | |
| 41 ## @group | |
| 42 ## genvarname (@{"foo", "foo"@}) | |
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43 ## @result{} |
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44 ## @{ |
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45 ## [1,1] = foo |
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46 ## [1,2] = foo1 |
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47 ## @} |
| 7657 | 48 ## @end group |
| 49 ## @end example | |
| 50 ## | |
| 51 ## Note that the result is a char array/cell array of strings, not the | |
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52 ## variables themselves. To define a variable, @code{eval()} can be |
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53 ## used. The following trivial example sets @code{x} to @code{42}. |
| 7657 | 54 ## |
| 55 ## @example | |
| 56 ## @group | |
| 57 ## name = genvarname ("x"); | |
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58 ## eval ([name " = 42"]); |
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59 ## @result{} x = 42 |
| 7657 | 60 ## @end group |
| 61 ## @end example | |
| 62 ## | |
| 63 ## Also, this can be useful for creating unique struct field names. | |
| 64 ## | |
| 65 ## @example | |
| 66 ## @group | |
| 67 ## x = struct (); | |
| 68 ## for i = 1:3 | |
| 69 ## x.(genvarname ("a", fieldnames (x))) = i; | |
| 70 ## endfor | |
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71 ## @result{} x = |
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72 ## @{ |
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73 ## a = 1 |
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74 ## a1 = 2 |
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75 ## a2 = 3 |
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76 ## @} |
| 7657 | 77 ## @end group |
| 78 ## @end example | |
| 79 ## | |
| 80 ## Since variable names may only contain letters, digits and underscores, | |
| 81 ## genvarname replaces any sequence of disallowed characters with | |
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82 ## an underscore. Also, variables may not begin with a digit; in this |
| 7657 | 83 ## case an underscore is added before the variable name. |
| 84 ## | |
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85 ## Variable names beginning and ending with two underscores @qcode{"__"} are |
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86 ## valid but they are used internally by octave and should generally be |
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87 ## avoided, therefore genvarname will not generate such names. |
| 7657 | 88 ## |
| 89 ## genvarname will also make sure that returned names do not clash with | |
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90 ## keywords such as @qcode{"for"} and @qcode{"if"}. A number will be |
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91 ## appended if necessary. Note, however, that this does @strong{not} include |
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92 ## function names, such as @qcode{"sin"}. Such names should be included in |
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93 ## @var{avoid} if necessary. |
| 7657 | 94 ## @seealso{isvarname, exist, tmpnam, eval} |
| 95 ## @end deftypefn | |
| 96 | |
| 97 ## Authors: Rob Platt <robert.platt@postgrad.manchester.ac.uk> | |
| 98 ## Bill Denney <bill@denney.ws> | |
| 99 | |
| 100 function varname = genvarname (str, exclusions) | |
| 101 | |
| 102 strinput = ischar (str); | |
| 103 ## Process the inputs | |
| 104 if (nargin < 2) | |
| 105 exclusions = {}; | |
| 106 elseif (ischar (exclusions)) | |
| 107 if (rows (exclusions) != 1) | |
| 8664 | 108 error ("genvarname: if more than one exclusion is given, it must be a cellstr"); |
| 7657 | 109 endif |
| 110 exclusions = {exclusions}; | |
| 111 elseif (! iscellstr (exclusions)) | |
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112 error ("genvarname: EXCLUSIONS must be a string or a cellstr"); |
| 7657 | 113 endif |
| 114 if (ischar (str)) | |
| 115 if (rows (str) != 1) | |
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116 error ("genvarname: if more than one STR is given, it must be a cellstr"); |
| 7657 | 117 endif |
| 118 str = {str}; | |
| 119 elseif (! iscellstr (str)) | |
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120 error ("genvarname: STR must be a string or a cellstr"); |
| 7657 | 121 endif |
| 122 | |
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123 validchars = ["A":"Z", "a":"z", "0":"9", "_"]; |
| 7657 | 124 |
| 125 varname = cell (size (str)); | |
| 126 for i = 1:numel (str) | |
| 127 ## Perform any modifications to the varname to make sure that it is | |
| 128 ## a valid variable name. | |
| 129 | |
| 130 ## remove invalid characters | |
| 131 str{i}(! ismember (str{i}, validchars)) = "_"; | |
| 132 ## do not use keywords | |
| 133 if (iskeyword (str{i})) | |
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134 str{i} = ["_" str{i}]; |
| 7657 | 135 endif |
| 136 ## double underscores at the beginning and end are reserved variables | |
| 137 underscores = (str{i} == "_"); | |
| 138 if (any (underscores)) | |
| 139 firstnon = find (!underscores, 1); | |
| 140 lastnon = find (!underscores, 1, "last"); | |
| 141 str{i}([1:firstnon-2, lastnon+2:end]) = []; | |
| 142 endif | |
| 143 ## The variable cannot be empty | |
| 144 if (isempty (str{i})) | |
| 145 str{i} = "x"; | |
| 146 endif | |
| 147 ## it cannot start with a number | |
| 148 if (ismember (str{i}(1), "0":"9")) | |
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149 str{i} = ["_" str{i}]; |
| 7657 | 150 endif |
| 151 | |
| 152 ## make sure that the variable is unique relative to other variables | |
| 153 ## and the exclusions list | |
| 154 excluded = any (strcmp (str{i}, exclusions)); | |
| 155 if (excluded && ismember (str{i}(end), "0":"9")) | |
| 156 ## if it is not unique and ends with a digit, add an underscore to | |
| 157 ## make the variable name more readable ("x1_1" instead of "x11") | |
| 158 str{i}(end+1) = "_"; | |
| 159 endif | |
| 160 varname(i) = str(i); | |
| 161 idx = 0; | |
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162 while (excluded) |
| 7657 | 163 idx++; |
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164 varname{i} = sprintf ("%s%d", str{i}, idx); |
| 7657 | 165 excluded = any (strcmp (varname{i}, exclusions)); |
| 166 endwhile | |
| 167 exclusions(end+1) = varname(i); | |
| 168 endfor | |
| 169 | |
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170 if (strinput) |
| 7657 | 171 varname = varname{1}; |
| 172 endif | |
| 173 | |
| 174 endfunction | |
| 175 | |
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176 |
| 7657 | 177 ## a single argument |
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178 %!assert (genvarname ("a"), "a") |
| 7657 | 179 ## a single argument with a non-conflicting exception |
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180 %!assert (genvarname ("a", "b"), "a") |
| 7657 | 181 ## a single argument with a conflicting exception |
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182 %!assert (genvarname ("a", "a"), "a1") |
| 7657 | 183 ## a single argument as a cell |
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184 %!assert (genvarname ({"a"}), {"a"}) |
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185 %!assert (genvarname ({"a"}, "b"), {"a"}) |
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186 %!assert (genvarname ({"a"}, {"b"}), {"a"}) |
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187 %!assert (genvarname ({"a"}, "a"), {"a1"}) |
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188 %!assert (genvarname ({"a"}, {"a"}), {"a1"}) |
| 7657 | 189 ## Test different arguments |
| 190 ## orientation | |
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191 %!assert (genvarname ({"a" "b"}), {"a" "b"}) |
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192 %!assert (genvarname ({"a";"b"}), {"a";"b"}) |
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193 %!assert (genvarname ({"a" "a"}), {"a" "a1"}) |
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194 %!assert (genvarname ({"a" "b";"c" "d"}), {"a" "b";"c" "d"}) |
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195 %!assert (genvarname ({"a" "a" "a";"a" "a" "a"}), {"a" "a2" "a4";"a1" "a3" "a5"}) |
| 7657 | 196 ## more than one repetition |
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197 %!assert (genvarname ({"a" "a" "a"}), {"a" "a1" "a2"}) |
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198 %!assert (genvarname ({"a" "a" "a"}, {"a" "a1" "a2"}), {"a3" "a4" "a5"}) |
| 7657 | 199 ## more than one repetition not in order |
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200 %!assert (genvarname ({"a" "b" "a" "b" "a"}), {"a" "b" "a1" "b1" "a2"}) |
| 7657 | 201 ## Variable name munging |
| 202 %!assert (genvarname ("__x__"), "_x_") | |
| 203 %!assert (genvarname ("123456789"), "_123456789") | |
| 204 %!assert (genvarname ("_$1__"), "_1_") | |
| 205 %!assert (genvarname ("__foo__", "_foo_"), "_foo_1") | |
| 206 %!assert (genvarname ("1million_and1", "_1million_and1"), "_1million_and1_1") | |
| 207 %!assert (genvarname ({"", "", ""}), {"x", "x1", "x2"}) | |
| 208 %!assert (genvarname ("if"), "_if") | |
| 209 %!assert (genvarname ({"if", "if", "if"}), {"_if", "_if1", "_if2"}) | |
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210 |