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maint: Merge default to bytecode-interpreter
author Arun Giridhar <arungiridhar@gmail.com>
date Fri, 24 May 2024 16:22:41 -0400
parents 2e484f9f1f18
children
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1 ########################################################################
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2 ##
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3 ## Copyright (C) 2017-2024 The Octave Project Developers
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4 ##
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5 ## See the file COPYRIGHT.md in the top-level directory of this
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6 ## distribution or <https://octave.org/copyright/>.
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7 ##
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8 ## This file is part of Octave.
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9 ##
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10 ## Octave is free software: you can redistribute it and/or modify it
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11 ## under the terms of the GNU General Public License as published by
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12 ## the Free Software Foundation, either version 3 of the License, or
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13 ## (at your option) any later version.
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14 ##
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15 ## Octave is distributed in the hope that it will be useful, but
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16 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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17 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 ## GNU General Public License for more details.
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19 ##
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20 ## You should have received a copy of the GNU General Public License
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21 ## along with Octave; see the file COPYING. If not, see
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22 ## <https://www.gnu.org/licenses/>.
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23 ##
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24 ########################################################################
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25
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26 ## -*- texinfo -*-
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27 ## @deftypefn {} {@var{newstr} =} erase (@var{str}, @var{ptn})
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28 ## Delete all occurrences of @var{ptn} within @var{str}.
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29 ##
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30 ## @var{str} and @var{ptn} can be ordinary strings, cell array of strings, or
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31 ## character arrays.
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32 ##
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33 ## Examples
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34 ##
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35 ## @example
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36 ## @group
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37 ## ## string, single pattern
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38 ## erase ("Hello World!", " World")
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39 ## @result{} "Hello!"
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40 ##
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41 ## ## cellstr, single pattern
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42 ## erase (@{"Hello", "World!"@}, "World")
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43 ## @result{} @{"Hello", "!"@}
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44 ##
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45 ## ## string, multiple patterns
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46 ## erase ("The Octave interpreter is fabulous", ...
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47 ## @{"interpreter ", "The "@})
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48 ## @result{} "Octave is fabulous"
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49 ##
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50 ## ## cellstr, multiple patterns
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51 ## erase (@{"The ", "Octave interpreter ", "is fabulous"@}, ...
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52 ## @{"interpreter ", "The "@})
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53 ## @result{} @{"", "Octave ", "is fabulous"@}
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54 ## @end group
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55 ## @end example
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56 ##
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57 ## Programming Note: @code{erase} deletes the first instance of a pattern in a
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58 ## string when there are overlapping occurrences. For example:
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59 ##
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60 ## @example
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61 ## @group
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62 ## erase ("abababa", "aba")
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63 ## @result{} "b"
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64 ## @end group
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65 ## @end example
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66 ##
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67 ## For processing overlaps, @pxref{XREFstrrep,,@code{strrep}}.
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68 ##
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69 ## @seealso{strrep, regexprep}
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70 ## @end deftypefn
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71
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72
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73 function newstr = erase (str, ptn)
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74
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75 if (nargin != 2)
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76 print_usage ();
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77 endif
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78
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79 ischarmatrix = false;
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80 if (ischar (str))
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81 if (rows (str) > 1)
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82 ## Convert to cell. Can't use cellstr which trims spaces.
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83 str = mat2cell (str, ones (1, rows (str)));
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84 ischarmatrix = true;
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85 endif
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86 elseif (! iscellstr (str))
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87 error ("erase: STR must be a string or cell array of strings");
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88 endif
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89
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90 if (ischar (ptn))
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91 if (rows (ptn) > 1)
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92 warning ("Octave:erase:chararray",
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93 "erase: using character array for PTN is not recommended, consider cell array of strings instead");
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94 ## Convert to cell. Can't use cellstr which trims spaces.
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95 ptn = mat2cell (ptn, ones (1, rows (ptn)));
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96 endif
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97 elseif (! iscellstr (ptn))
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98 error ("erase: PTN must be a string or cell array of strings");
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99 endif
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100
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101 nptn = ifelse (ischar (ptn), 1, numel (ptn));
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102 if (nptn == 1)
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103 newstr = strrep (str, ptn, "", "overlaps", false);
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104 else
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105 ptn = regexptranslate ("escape", ptn(:).');
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106 ptn = strjoin (ptn, '|');
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107 newstr = regexprep (str, ptn, "");
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108 endif
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109
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110 if (ischarmatrix)
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111 newstr = char (newstr);
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112 endif
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113
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114 endfunction
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115
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116
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117 %!assert (erase ("Hello World!", " World"), "Hello!")
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118 %!assert (erase ({"Hello World!"}, " World"), {"Hello!"})
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119 %!assert (erase (char ("Hello", "World!"), "World"), char ("Hello ", "!"))
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120 %!assert (erase ({"Hello", "World!"}, "World"), {"Hello", "!"})
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121 %!assert (erase ("Hello World!", {"o"; "World"; " "}), "Hell!")
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122
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123 ## Test overlaps
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124 ## from https://savannah.gnu.org/bugs/?52647#comment5
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125 %!assert (erase ('ababa', 'aba'), 'ba')
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126 %!assert (erase ('abababa', 'aba'), 'b')
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127 %!assert (erase ('ababababa', 'aba'), 'bba')
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128 %!assert (erase ('ababababa', {'aba', 'bba'}), 'bba')
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129 %!assert (erase ('ababababa ', {'aba', 'bba'}), 'bba ')
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130 %!assert (erase ({' ababababa '}, {'aba', 'bba'}), {' bba '})
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131 %!assert (erase (' ababa ', {'aba', 'baba'}), ' ba ')
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132 %!assert (erase (' Hello World t ', {'t';'llo'}), ' He World ')
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133 %!assert (erase ({' Hello World t '}, [ 'o ']), {' HellWorld t '})
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134 %!assert (erase ( 'Hello World t ', {'ld '; 'o '}), 'HellWort ')
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135 %!assert (erase ('aba', 'aba'), '')
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136 %!assert (erase ({'aba'}, 'aba'), ({""}))
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137 %!assert (erase ('', 'aba'), '')
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138 %!assert (erase ({'abbabbabba'},{'abba'}), {'bb'})
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139 %!assert (erase ({'ababababa';'abbabbabba'}, 'aba'), {'bba';'abbabbabba'})
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140 %!assert (erase ({''}, {''}), {''})
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141 %!assert (erase ({'pppppppp'}, 'p'), {''})
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142 %!assert (erase ('Hello World t ', {'ld '; 'o '}), 'HellWort ')
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143 %!assert (erase ({'Hello World t '}, {'ld '; 'o '}), {'HellWort '})
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144
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145 ## Test input validation
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146 %!error <Invalid call> erase ()
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Sahil Yadav
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147 %!error erase ("a")
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Sahil Yadav
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148 %!error erase ("a", "b", "c")
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149 %!error <STR must be a string> erase ([1], "foo")
ab2321d4ba03 maint: strip trailing whitespace from source files
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150 %!error <PTN must be a string> erase ("foo", [1])
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Rik <rik@octave.org>
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151 %!warning <using character array for PTN is not recommended>
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Rik <rik@octave.org>
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152 %! erase ("a", ["a";"b"]);