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1 /* |
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2 |
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3 Copyright (C) 1996, 1997 John W. Eaton |
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4 |
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5 This file is part of Octave. |
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6 |
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7 Octave is free software; you can redistribute it and/or modify it |
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8 under the terms of the GNU General Public License as published by the |
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9 Free Software Foundation; either version 2, or (at your option) any |
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10 later version. |
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11 |
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12 Octave is distributed in the hope that it will be useful, but WITHOUT |
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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15 for more details. |
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16 |
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17 You should have received a copy of the GNU General Public License |
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18 along with Octave; see the file COPYING. If not, write to the Free |
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19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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20 |
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21 */ |
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22 |
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23 #if defined (__GNUG__) |
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24 #pragma implementation |
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25 #endif |
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26 |
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27 #ifdef HAVE_CONFIG_H |
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28 #include <config.h> |
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29 #endif |
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30 |
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31 #include <iostream> |
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32 |
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33 #include "lo-ieee.h" |
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34 #include "lo-utils.h" |
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35 |
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36 #include "gripes.h" |
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37 #include "ops.h" |
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38 #include "oct-obj.h" |
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39 #include "ov-range.h" |
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40 #include "ov-re-mat.h" |
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41 #include "ov-scalar.h" |
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42 #include "pr-output.h" |
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43 |
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44 DEFINE_OCTAVE_ALLOCATOR (octave_range); |
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45 |
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46 DEFINE_OV_TYPEID_FUNCTIONS_AND_DATA (octave_range, "range"); |
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47 |
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48 static octave_value * |
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49 default_numeric_conversion_function (const octave_value& a) |
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50 { |
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51 CAST_CONV_ARG (const octave_range&); |
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52 |
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53 return new octave_matrix (v.matrix_value ()); |
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54 } |
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55 |
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56 type_conv_fcn |
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57 octave_range::numeric_conversion_function (void) const |
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58 { |
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59 return default_numeric_conversion_function; |
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60 } |
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61 |
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62 octave_value * |
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63 octave_range::try_narrowing_conversion (void) |
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64 { |
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65 octave_value *retval = 0; |
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66 |
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67 switch (range.nelem ()) |
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68 { |
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69 case 1: |
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70 retval = new octave_scalar (range.base ()); |
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71 break; |
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72 |
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73 case 0: |
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74 retval = new octave_matrix (Matrix ()); |
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75 break; |
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76 |
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77 default: |
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78 break; |
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79 } |
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80 |
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81 return retval; |
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82 } |
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83 |
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84 octave_value |
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85 octave_range::subsref (const std::string type, |
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86 const SLList<octave_value_list>& idx) |
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87 { |
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88 octave_value retval; |
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89 |
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90 switch (type[0]) |
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91 { |
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92 case '(': |
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93 retval = do_index_op (idx.front ()); |
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94 break; |
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95 |
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96 case '{': |
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97 case '.': |
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98 { |
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99 std::string nm = type_name (); |
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100 error ("%s cannot be indexed with %c", nm.c_str (), type[0]); |
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101 } |
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102 break; |
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103 |
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104 default: |
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105 panic_impossible (); |
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106 } |
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107 |
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108 return retval.next_subsref (type, idx); |
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109 } |
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110 |
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111 octave_value |
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112 octave_range::do_index_op (const octave_value_list& idx, int resize_ok) |
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113 { |
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114 // XXX FIXME XXX -- this doesn't solve the problem of |
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115 // |
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116 // a = 1:5; a(1, 1, 1) |
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117 // |
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118 // and similar constructions. Hmm... |
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119 |
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120 // XXX FIXME XXX -- using this constructor avoids possibly narrowing |
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121 // the range to a scalar value. Need a better solution to this |
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122 // problem. |
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123 |
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124 octave_value tmp (new octave_matrix (range.matrix_value ())); |
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125 |
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126 return tmp.do_index_op (idx, resize_ok); |
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127 } |
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128 |
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129 double |
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130 octave_range::double_value (bool) const |
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131 { |
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132 double retval = octave_NaN; |
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133 |
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134 int nel = range.nelem (); |
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135 |
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136 if (nel == 1 || (nel > 1 && Vdo_fortran_indexing)) |
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137 retval = range.base (); |
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138 else |
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139 gripe_invalid_conversion ("range", "real scalar"); |
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140 |
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141 return retval; |
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142 } |
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143 |
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144 octave_value |
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145 octave_range::all (void) const |
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146 { |
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147 // XXX FIXME XXX -- this is a potential waste of memory. |
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148 |
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149 Matrix m = range.matrix_value (); |
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150 |
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151 return m.all (); |
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152 } |
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153 |
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154 octave_value |
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155 octave_range::any (void) const |
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156 { |
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157 return static_cast<double> (range.base () != 0.0 || range.nelem () > 1); |
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158 } |
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159 |
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160 bool |
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161 octave_range::is_true (void) const |
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162 { |
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163 bool retval = false; |
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164 |
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165 if (range.nelem () == 0) |
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166 { |
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167 int flag = Vpropagate_empty_matrices; |
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168 |
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169 if (flag < 0) |
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170 warning ("empty range used in conditional expression"); |
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171 else if (flag == 0) |
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172 error ("empty range used in conditional expression"); |
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173 } |
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174 else |
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175 { |
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176 // XXX FIXME XXX -- this is a potential waste of memory. |
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177 |
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178 Matrix m ((range.matrix_value () . all ()) . all ()); |
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179 |
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180 retval = (m.rows () == 1 && m.columns () == 1 && m (0, 0) != 0.0); |
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181 } |
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182 |
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183 return retval; |
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184 } |
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185 |
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186 Complex |
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187 octave_range::complex_value (bool) const |
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188 { |
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189 Complex retval (octave_NaN, octave_NaN); |
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190 |
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191 int nel = range.nelem (); |
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192 |
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193 if (nel == 1 || (nel > 1 && Vdo_fortran_indexing)) |
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194 retval = range.base (); |
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195 else |
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196 gripe_invalid_conversion ("range", "complex scalar"); |
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197 |
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198 return retval; |
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199 } |
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200 |
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201 octave_value |
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202 octave_range::convert_to_str (void) const |
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203 { |
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204 octave_value tmp (range.matrix_value ()); |
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205 return tmp.convert_to_str (); |
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206 } |
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207 |
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208 void |
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209 octave_range::print (std::ostream& os, bool pr_as_read_syntax) const |
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210 { |
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211 print_raw (os, pr_as_read_syntax); |
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212 newline (os); |
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213 } |
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214 |
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215 void |
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216 octave_range::print_raw (std::ostream& os, bool pr_as_read_syntax) const |
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217 { |
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218 octave_print_internal (os, range, pr_as_read_syntax, |
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219 current_print_indent_level ()); |
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220 } |
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221 |
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222 bool |
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223 octave_range::print_name_tag (std::ostream& os, const std::string& name) const |
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224 { |
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225 bool retval = false; |
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226 |
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227 int n = range.nelem (); |
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228 |
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229 indent (os); |
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230 |
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231 if (n == 0 || n == 1) |
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232 os << name << " = "; |
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233 else |
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234 { |
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235 os << name << " ="; |
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236 newline (os); |
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237 newline (os); |
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238 retval = true; |
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239 } |
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240 |
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241 return retval; |
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242 } |
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243 |
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244 /* |
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245 ;;; Local Variables: *** |
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246 ;;; mode: C++ *** |
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247 ;;; End: *** |
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248 */ |
