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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__) && defined (USE_PRAGMA_INTERFACE_IMPLEMENTATION) |
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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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3503
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31 #include <iostream> |
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32 |
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4051
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33 #include "lo-sstream.h" |
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34 #include "lo-utils.h" |
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35 |
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4513
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36 #include "Cell.h" |
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37 #include "defun.h" |
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38 #include "error.h" |
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39 #include "ov-list.h" |
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40 #include "unwind-prot.h" |
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41 |
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3219
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42 DEFINE_OCTAVE_ALLOCATOR (octave_list); |
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43 |
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3219
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44 DEFINE_OV_TYPEID_FUNCTIONS_AND_DATA (octave_list, "list"); |
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45 |
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4513
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46 octave_list::octave_list (const Cell& c) |
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47 : octave_base_value (), lst () |
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48 { |
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49 int n = c.length (); |
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50 |
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51 lst.resize (n); |
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52 |
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53 for (int i = 0; i < n; i++) |
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54 lst(i) = c(i); |
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55 } |
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56 |
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57 octave_value |
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58 octave_list::subsref (const std::string& type, |
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59 const std::list<octave_value_list>& idx) |
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60 { |
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61 octave_value retval; |
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62 |
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63 switch (type[0]) |
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64 { |
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65 case '(': |
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66 { |
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67 octave_value_list tmp_idx = idx.front (); |
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68 |
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69 if (tmp_idx.length () == 1) |
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70 { |
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71 idx_vector i = tmp_idx (0).index_vector (); |
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72 |
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73 retval = octave_value (octave_value_list (lst.index (i))); |
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74 } |
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75 else |
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76 error ("only one index allowed for lists"); |
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77 } |
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78 break; |
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79 |
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80 case '{': |
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81 { |
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82 octave_value_list tmp_idx = idx.front (); |
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83 |
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84 if (tmp_idx.length () == 1) |
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85 { |
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86 idx_vector i = tmp_idx (0).index_vector (); |
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87 |
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88 octave_value_list tmp = lst.index (i); |
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89 |
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90 if (tmp.length () == 1) |
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91 retval = tmp(0); |
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92 } |
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93 else |
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94 error ("only one index allowed for lists"); |
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95 } |
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96 break; |
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97 |
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98 case '.': |
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99 { |
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100 std::string nm = type_name (); |
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101 error ("%s cannot be indexed with %c", nm.c_str (), type[0]); |
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102 } |
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103 break; |
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104 |
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105 default: |
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106 panic_impossible (); |
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107 } |
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108 |
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109 return retval.next_subsref (type, idx); |
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110 } |
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111 |
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112 octave_value |
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113 octave_list::do_index_op (const octave_value_list& idx, int resize_ok) |
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114 { |
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115 octave_value retval; |
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116 |
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117 if (idx.length () == 1) |
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118 { |
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119 idx_vector i = idx (0).index_vector (); |
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120 |
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121 retval = octave_value (octave_value_list (lst.index (i, resize_ok))); |
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122 } |
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123 else |
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124 error ("lists may only be indexed by a single scalar"); |
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125 |
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126 return retval; |
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127 } |
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128 |
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129 octave_value |
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130 octave_list::subsasgn (const std::string& type, |
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131 const std::list<octave_value_list>& idx, |
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132 const octave_value& rhs) |
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133 { |
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134 octave_value retval; |
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135 |
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136 int n = type.length (); |
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137 |
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138 octave_value t_rhs = rhs; |
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139 |
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140 if (n > 1) |
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141 { |
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142 switch (type[0]) |
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143 { |
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144 case '(': |
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145 { |
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146 octave_value tmp = do_index_op (idx.front (), true); |
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147 |
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148 if (! tmp.is_defined ()) |
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149 tmp = octave_value::empty_conv (type.substr (1), rhs); |
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150 |
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151 if (! error_state) |
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152 { |
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153 std::list<octave_value_list> next_idx (idx); |
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154 |
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155 next_idx.erase (next_idx.begin ()); |
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156 |
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157 t_rhs = tmp.subsasgn (type.substr (1), next_idx, rhs); |
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158 } |
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159 } |
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160 break; |
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161 |
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162 case '{': |
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163 case '.': |
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164 { |
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165 std::string nm = type_name (); |
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166 error ("%s cannot be indexed with %c", nm.c_str (), type[0]); |
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167 } |
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168 break; |
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169 |
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170 default: |
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171 panic_impossible (); |
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172 } |
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173 } |
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174 |
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3940
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175 if (! error_state) |
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176 { |
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177 switch (type[0]) |
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178 { |
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179 case '(': |
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180 { |
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181 octave_value_list i = idx.front (); |
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182 |
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183 assign (i, t_rhs); |
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184 |
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185 retval = octave_value (this, count + 1); |
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186 } |
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187 break; |
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188 |
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189 case '{': |
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190 case '.': |
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191 { |
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192 std::string nm = type_name (); |
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193 error ("%s cannot be indexed with %c", nm.c_str (), type[0]); |
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194 } |
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195 break; |
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196 |
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197 default: |
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198 panic_impossible (); |
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199 } |
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3933
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200 } |
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201 |
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202 return retval; |
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203 } |
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204 |
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205 void |
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206 octave_list::assign (const octave_value_list& idx, const octave_value& rhs) |
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207 { |
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208 if (idx.length () == 1) |
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209 { |
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3202
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210 int i = idx(0).int_value (true); |
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211 |
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212 if (! error_state) |
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213 { |
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214 int n = lst.length (); |
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215 |
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4461
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216 if (i > 0) |
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217 { |
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218 if (Vwarn_resize_on_range_error && i > n) |
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219 warning ("list index = %d out of range", i); |
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220 |
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221 lst(i-1) = rhs; |
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222 } |
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223 else |
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224 error ("list index = %d out of range", i); |
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225 } |
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3202
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226 else |
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227 error ("list index must be an integer"); |
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228 } |
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229 else |
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230 error ("lists may only be indexed by a single scalar"); |
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231 } |
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232 |
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233 void |
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3523
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234 octave_list::print (std::ostream& os, bool) const |
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235 { |
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236 print_raw (os); |
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237 } |
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238 |
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239 void |
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240 octave_list::print_raw (std::ostream& os, bool) const |
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241 { |
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242 unwind_protect::begin_frame ("octave_list_print"); |
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243 |
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244 int n = lst.length (); |
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245 |
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3196
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246 if (n > 0) |
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247 { |
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248 indent (os); |
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249 os << "("; |
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250 newline (os); |
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251 |
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252 increment_indent_level (); |
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253 |
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254 for (int i = 0; i < n; i++) |
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255 { |
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256 OSSTREAM buf; |
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257 |
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258 buf << "[" << i+1 << "]" << OSSTREAM_ENDS; |
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259 |
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260 octave_value val = lst(i); |
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261 |
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262 val.print_with_name (os, OSSTREAM_STR (buf)); |
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263 |
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264 OSSTREAM_FREEZE (buf); |
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265 } |
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266 |
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267 decrement_indent_level (); |
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268 |
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269 indent (os); |
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270 os << ")"; |
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271 } |
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272 else |
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273 os << "()"; |
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274 |
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2901
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275 newline (os); |
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276 |
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2985
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277 unwind_protect::run_frame ("octave_list_print"); |
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278 } |
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279 |
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280 bool |
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281 octave_list::print_name_tag (std::ostream& os, const std::string& name) const |
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282 { |
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283 indent (os); |
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284 if (lst.length () == 0) |
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285 os << name << " = "; |
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286 else |
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287 { |
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288 os << name << " ="; |
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289 newline (os); |
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290 } |
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291 return false; |
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292 } |
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293 |
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294 DEFUN (list, args, , |
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295 "-*- texinfo -*-\n\ |
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296 @deftypefn {Built-in Function} {} list (@var{a1}, @var{a2}, @dots{})\n\ |
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297 Create a new list with elements given by the arguments @var{a1},\n\ |
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298 @var{a2}, @dots{}.\n\ |
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299 @end deftypefn") |
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300 { |
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301 return octave_value (args); |
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302 } |
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303 |
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304 DEFUN (nth, args, , |
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305 "-*- texinfo -*-\n\ |
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306 @deftypefn {Built-in Function} {} nth (@var{list}, @var{n})\n\ |
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307 Return the @var{n}-th element of @var{list}.\n\ |
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308 @end deftypefn") |
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309 { |
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310 octave_value retval; |
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311 |
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312 if (args.length () == 2) |
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313 { |
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314 octave_value_list lst = args(0).list_value (); |
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315 |
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316 if (! error_state) |
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317 { |
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318 int n = args(1).int_value (true); |
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319 |
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320 if (! error_state) |
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321 { |
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322 if (n > 0 && n <= lst.length ()) |
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323 retval = lst(n-1); |
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324 else |
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325 error ("nth: index = %d out of range", n); |
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326 } |
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327 else |
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328 error ("nth: second argument must be an integer"); |
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329 } |
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330 else |
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331 error ("nth: first argument must be a list"); |
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332 } |
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333 else |
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334 print_usage ("nth"); |
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335 |
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336 return retval; |
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337 } |
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338 |
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339 DEFUN (append, args, , |
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340 "-*- texinfo -*-\n\ |
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341 @deftypefn {Built-in Function} {} append (@var{list}, @var{a1}, @var{a2}, @dots{})\n\ |
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342 Return a new list created by appending @var{a1}, @var{a1}, @dots{}, to\n\ |
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343 @var{list}. If any of the arguments to be appended is a list, its\n\ |
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344 elements are appended individually. For example,\n\ |
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345 \n\ |
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346 @example\n\ |
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347 x = list (1, 2);\n\ |
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348 y = list (3, 4);\n\ |
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349 append (x, y);\n\ |
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350 @end example\n\ |
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351 \n\ |
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352 @noindent\n\ |
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353 results in the list containing the four elements @samp{(1 2 3 4)}, not\n\ |
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354 a list containing the three elements @samp{(1 2 (3 4))}.\n\ |
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355 @end deftypefn") |
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356 { |
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357 octave_value retval; |
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358 |
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359 int nargin = args.length (); |
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360 |
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361 if (nargin > 1) |
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362 { |
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363 octave_value_list tmp = args(0).list_value (); |
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364 |
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365 if (! error_state) |
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366 { |
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367 for (int i = 1; i < nargin; i++) |
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368 { |
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369 octave_value ov = args(i); |
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370 |
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371 if (ov.is_list ()) |
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372 tmp.append (ov.list_value ()); |
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373 else |
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374 tmp.append (ov); |
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375 } |
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376 |
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377 retval = octave_value (tmp); |
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378 } |
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379 } |
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380 else |
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381 print_usage ("append"); |
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382 |
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383 return retval; |
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384 } |
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385 |
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386 DEFUN (reverse, args, , |
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387 "-*- texinfo -*-\n\ |
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388 @deftypefn {Built-in Function} {} reverse (@var{list})\n\ |
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389 Return a new list created by reversing the elements of @var{list}.\n\ |
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390 @end deftypefn") |
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391 { |
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392 octave_value retval; |
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393 |
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394 int nargin = args.length (); |
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395 |
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396 if (nargin == 1) |
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397 { |
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398 octave_value_list tmp = args(0).list_value (); |
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399 |
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400 if (! error_state) |
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401 retval = octave_value (tmp.reverse ()); |
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402 } |
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403 else |
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404 print_usage ("reverse"); |
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405 |
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406 return retval; |
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407 } |
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408 |
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409 DEFUN (splice, args, , |
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410 "-*- texinfo -*-\n\ |
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411 @deftypefn {Built-in Function} {} splice (@var{list_1}, @var{offset}, @var{length}, @var{list_2})\n\ |
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412 Replace @var{length} elements of @var{list_1} beginning at\n\ |
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413 @var{offset} with the contents of @var{list_2} (if any). If\n\ |
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414 @var{length} is omitted, all elements from @var{offset} to the end of\n\ |
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415 @var{list_1} are replaced. As a special case, if @var{offset} is one\n\ |
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416 greater than the length of @var{list_1} and @var{length} is 0, splice\n\ |
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417 is equivalent to @code{append (@var{list_1}, @var{list_2})}.\n\ |
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418 @end deftypefn") |
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3196
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419 { |
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420 octave_value retval; |
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421 |
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422 int nargin = args.length (); |
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423 |
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424 if (nargin > 1 && nargin < 5) |
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425 { |
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426 octave_value_list list_1 = args(0).list_value (); |
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427 |
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428 if (! error_state) |
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429 { |
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3202
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430 int offset = args(1).int_value (true); |
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3196
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431 |
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432 if (! error_state) |
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433 { |
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3202
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434 offset--; |
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435 |
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436 int length = 0; |
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437 |
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438 octave_value_list list_2; |
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3196
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439 |
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3202
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440 if (nargin < 3) |
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441 length = list_1.length () - offset; |
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442 else |
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443 { |
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444 length = args(2).int_value (true); |
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3196
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445 |
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3202
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446 if (! error_state) |
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3196
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447 { |
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3202
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448 if (nargin == 4) |
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449 { |
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450 list_2 = args(3).list_value (); |
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3196
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451 |
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3202
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452 if (error_state) |
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453 error ("splice: fourth argument must be a list"); |
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3196
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454 } |
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455 } |
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3202
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456 else |
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457 error ("splice: LENGTH must be an integer"); |
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458 } |
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3196
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459 |
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3202
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460 if (! error_state) |
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4233
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461 retval = octave_value (list_1.splice (offset, length, list_2)); |
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3196
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462 } |
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463 else |
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464 error ("splice: OFFSET must be an integer"); |
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465 } |
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466 else |
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467 error ("splice: first argument must be a list"); |
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468 } |
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469 else |
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470 print_usage ("splice"); |
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471 |
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472 return retval; |
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473 } |
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474 |
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2882
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475 /* |
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476 ;;; Local Variables: *** |
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477 ;;; mode: C++ *** |
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478 ;;; End: *** |
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479 */ |
