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annotate scripts/general/genvarname.m @ 9037:4cb9f994dcec
Documentation cleanup of var.texi, expr.texi, eval.texi
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| author | Rik <rdrider0-list@yahoo.com> |
|---|---|
| date | Sun, 22 Mar 2009 08:41:49 -0700 |
| parents | eb63fbe60fab |
| children | be55736a0783 |
| rev | line source |
|---|---|
| 8920 | 1 ## Copyright (C) 2008, 2009 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 ()) | |
| 33 ## @result{} x1 | |
| 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"@}) | |
| 43 ## @result{} | |
| 44 ## @{ | |
| 45 ## [1,1] = foo | |
| 46 ## [1,2] = foo1 | |
| 47 ## @} | |
| 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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9037
4cb9f994dcec
Documentation cleanup of var.texi, expr.texi, eval.texi
Rik <rdrider0-list@yahoo.com>
parents:
8920
diff
changeset
|
52 ## variables themselves. To define a variable, @code{eval()} can be |
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4cb9f994dcec
Documentation cleanup of var.texi, expr.texi, eval.texi
Rik <rdrider0-list@yahoo.com>
parents:
8920
diff
changeset
|
53 ## used. The following trivial example sets @code{x} to @code{42}. |
| 7657 | 54 ## |
| 55 ## @example | |
| 56 ## @group | |
| 57 ## name = genvarname ("x"); | |
| 58 ## eval([name " = 42"]); | |
| 59 ## @result{} x = 42 | |
| 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 | |
| 71 ## @result{} | |
| 72 ## x = | |
| 73 ## @{ | |
| 74 ## a = 1 | |
| 75 ## a1 = 2 | |
| 76 ## a2 = 3 | |
| 77 ## @} | |
| 78 ## @end group | |
| 79 ## @end example | |
| 80 ## | |
| 81 ## Since variable names may only contain letters, digits and underscores, | |
| 82 ## genvarname replaces any sequence of disallowed characters with | |
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9037
4cb9f994dcec
Documentation cleanup of var.texi, expr.texi, eval.texi
Rik <rdrider0-list@yahoo.com>
parents:
8920
diff
changeset
|
83 ## an underscore. Also, variables may not begin with a digit; in this |
| 7657 | 84 ## case an underscore is added before the variable name. |
| 85 ## | |
| 86 ## Variable names beginning and ending with two underscores "__" are valid but | |
| 87 ## they are used internally by octave and should generally be avoided, therefore | |
| 88 ## genvarname will not generate such names. | |
| 89 ## | |
| 90 ## genvarname will also make sure that returned names do not clash with | |
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9037
4cb9f994dcec
Documentation cleanup of var.texi, expr.texi, eval.texi
Rik <rdrider0-list@yahoo.com>
parents:
8920
diff
changeset
|
91 ## keywords such as "for" and "if". A number will be appended if necessary. |
| 7657 | 92 ## Note, however, that this does @strong{not} include function names, |
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9037
4cb9f994dcec
Documentation cleanup of var.texi, expr.texi, eval.texi
Rik <rdrider0-list@yahoo.com>
parents:
8920
diff
changeset
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93 ## such as "sin". Such names should be included in @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)) | |
| 8664 | 112 error ("genvarname: exclusions must be a string or a cellstr"); |
| 7657 | 113 endif |
| 114 if (ischar (str)) | |
| 115 if (rows (str) != 1) | |
| 8664 | 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)) | |
| 8664 | 120 error ("genvarname: str must be a string or a cellstr"); |
| 7657 | 121 endif |
| 122 | |
| 123 validchars = cstrcat ("A":"Z", "a":"z", "0":"9", "_"); | |
| 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})) | |
| 134 str{i} = cstrcat ("_", str{i}); | |
| 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")) | |
| 149 str{i} = cstrcat ("_", str{i}); | |
| 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; | |
| 162 while excluded | |
| 163 idx++; | |
| 164 varname{i} = sprintf("%s%d", str{i}, idx); | |
| 165 excluded = any (strcmp (varname{i}, exclusions)); | |
| 166 endwhile | |
| 167 exclusions(end+1) = varname(i); | |
| 168 endfor | |
| 169 | |
| 170 if strinput | |
| 171 varname = varname{1}; | |
| 172 endif | |
| 173 | |
| 174 endfunction | |
| 175 | |
| 176 ## Tests | |
| 177 ## a single argument | |
| 178 %!assert(genvarname("a"), "a") | |
| 179 ## a single argument with a non-conflicting exception | |
| 180 %!assert(genvarname("a", "b"), "a") | |
| 181 ## a single argument with a conflicting exception | |
| 182 %!assert(genvarname("a", "a"), "a1") | |
| 183 ## a single argument as a cell | |
| 184 %!assert(genvarname({"a"}), {"a"}) | |
| 185 %!assert(genvarname({"a"}, "b"), {"a"}) | |
| 186 %!assert(genvarname({"a"}, {"b"}), {"a"}) | |
| 187 %!assert(genvarname({"a"}, "a"), {"a1"}) | |
| 188 %!assert(genvarname({"a"}, {"a"}), {"a1"}) | |
| 189 ## Test different arguments | |
| 190 ## orientation | |
| 191 %!assert(genvarname({"a" "b"}), {"a" "b"}) | |
| 192 %!assert(genvarname({"a";"b"}), {"a";"b"}) | |
| 193 %!assert(genvarname({"a" "a"}), {"a" "a1"}) | |
| 194 %!assert(genvarname({"a" "b";"c" "d"}), {"a" "b";"c" "d"}) | |
| 195 %!assert(genvarname({"a" "a" "a";"a" "a" "a"}), {"a" "a2" "a4";"a1" "a3" "a5"}) | |
| 196 ## more than one repetition | |
| 197 %!assert(genvarname({"a" "a" "a"}), {"a" "a1" "a2"}) | |
| 198 %!assert(genvarname({"a" "a" "a"}, {"a" "a1" "a2"}), {"a3" "a4" "a5"}) | |
| 199 ## more than one repetition not in order | |
| 200 %!assert(genvarname({"a" "b" "a" "b" "a"}), {"a" "b" "a1" "b1" "a2"}) | |
| 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"}) |