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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 "error.h" |
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32 #include "oct-obj.h" |
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33 #include "pager.h" |
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34 #include "ov.h" |
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35 #include "pt-colon.h" |
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36 #include "pt-pr-code.h" |
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37 #include "pt-walk.h" |
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38 |
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39 // Colon expressions. |
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40 |
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41 tree_colon_expression * |
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42 tree_colon_expression::append (tree_expression *t) |
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43 { |
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44 tree_colon_expression *retval = 0; |
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45 |
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46 if (op_base) |
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47 { |
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48 if (op_limit) |
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49 { |
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50 if (op_increment) |
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51 ::error ("invalid colon expression"); |
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52 else |
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53 { |
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54 // Stupid syntax: |
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55 // |
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56 // base : limit |
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57 // base : increment : limit |
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58 |
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59 op_increment = op_limit; |
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60 op_limit = t; |
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61 } |
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62 } |
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63 else |
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64 op_limit = t; |
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65 |
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66 retval = this; |
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67 } |
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68 else |
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69 ::error ("invalid colon expression"); |
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70 |
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71 return retval; |
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72 } |
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73 |
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74 octave_value_list |
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75 tree_colon_expression::rvalue (int nargout) |
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76 { |
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77 octave_value_list retval; |
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78 |
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79 if (nargout > 1) |
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80 error ("invalid number of output arguments for colon expression"); |
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81 else |
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82 retval = rvalue (); |
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83 |
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84 return retval; |
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85 } |
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86 |
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87 octave_value |
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88 tree_colon_expression::rvalue (void) |
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89 { |
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90 octave_value retval; |
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91 |
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92 if (error_state || ! op_base || ! op_limit) |
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93 return retval; |
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94 |
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95 octave_value tmp = op_base->rvalue (); |
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96 |
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97 if (tmp.is_undefined ()) |
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98 { |
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99 eval_error ("invalid null value in colon expression"); |
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100 return retval; |
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101 } |
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102 |
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103 double xbase = tmp.double_value (); |
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104 |
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105 if (error_state) |
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106 { |
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107 eval_error ("colon expression elements must be scalars"); |
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108 return retval; |
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109 } |
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110 |
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111 tmp = op_limit->rvalue (); |
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112 |
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113 if (tmp.is_undefined ()) |
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114 { |
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115 eval_error ("invalid null value in colon expression"); |
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116 return retval; |
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117 } |
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118 |
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119 double xlimit = tmp.double_value (); |
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120 |
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121 if (error_state) |
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122 { |
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123 eval_error ("colon expression elements must be scalars"); |
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124 return retval; |
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125 } |
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126 |
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127 double xinc = 1.0; |
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128 |
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129 if (op_increment) |
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130 { |
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131 tmp = op_increment->rvalue (); |
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132 |
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133 if (tmp.is_undefined ()) |
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134 { |
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135 eval_error ("invalid null value in colon expression"); |
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136 return retval; |
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137 } |
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138 |
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139 xinc = tmp.double_value (); |
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140 |
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141 if (error_state) |
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142 { |
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143 eval_error ("colon expression elements must be scalars"); |
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144 return retval; |
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145 } |
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146 } |
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147 |
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148 retval = octave_value (xbase, xlimit, xinc); |
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149 |
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150 if (error_state) |
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151 { |
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152 if (error_state) |
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153 eval_error (); |
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154 |
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155 return octave_value (); |
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156 } |
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157 |
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158 return retval; |
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159 } |
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160 |
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161 void |
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162 tree_colon_expression::eval_error (const string& s) |
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163 { |
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164 if (error_state > 0) |
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165 { |
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166 if (! s.empty ()) |
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167 ::error ("%s", s.c_str ()); |
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168 |
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169 ::error ("evaluating colon expression near line %d column %d", |
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170 line (), column ()); |
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171 } |
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172 } |
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173 |
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174 void |
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175 tree_colon_expression::accept (tree_walker& tw) |
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176 { |
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177 tw.visit_colon_expression (*this); |
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178 } |
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179 |
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180 /* |
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181 ;;; Local Variables: *** |
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182 ;;; mode: C++ *** |
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183 ;;; End: *** |
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184 */ |
