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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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31 #include <iostream> |
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32 #include <string> |
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33 |
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34 #include "str-vec.h" |
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35 |
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36 #include "defun.h" |
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37 #include "error.h" |
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38 #include "oct-obj.h" |
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39 #include "ov.h" |
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40 #include "ov-usr-fcn.h" |
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41 #include "pt-arg-list.h" |
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42 #include "pt-exp.h" |
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43 #include "pt-pr-code.h" |
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44 #include "pt-walk.h" |
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45 #include "toplev.h" |
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46 #include "unwind-prot.h" |
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47 |
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48 // Argument lists. |
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49 |
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50 tree_argument_list::~tree_argument_list (void) |
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51 { |
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52 while (! empty ()) |
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53 { |
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54 iterator p = begin (); |
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55 delete *p; |
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56 erase (p); |
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57 } |
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58 } |
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59 |
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60 void |
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61 tree_argument_list::append (const element_type& s) |
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62 { |
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63 octave_base_list<tree_expression *>::append (s); |
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64 |
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65 // XXX FIXME XXX -- wait, it's not that simple! The argument list |
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66 // may include expressions, so we will have to do some more work |
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67 // here. We need a new function for all expression types that can |
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68 // tell us whether the expression includes the magic end token! |
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69 |
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70 // if (s && s->is_identifier () && s->name () == "__end__") |
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71 |
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72 list_includes_magic_end = true; |
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73 } |
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74 |
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75 int |
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76 tree_argument_list::nargout_count (void) const |
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77 { |
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78 int retval = 0; |
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79 |
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80 for (const_iterator p = begin (); p != end (); p++) |
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81 { |
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82 tree_expression *elt = *p; |
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83 |
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84 // XXX FIXME XXX -- need to be able to determine whether elt is |
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85 // an expression that could evaluate to a cs-list object, and if |
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86 // so, how many elements are in that list. Ugly! |
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87 |
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88 retval++; |
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89 } |
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90 |
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91 return retval; |
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92 } |
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93 |
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94 bool |
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95 tree_argument_list::all_elements_are_constant (void) const |
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96 { |
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97 for (const_iterator p = begin (); p != end (); p++) |
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98 { |
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99 tree_expression *elt = *p; |
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100 |
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101 if (! elt->is_constant ()) |
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102 return false; |
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103 } |
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104 |
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105 return true; |
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106 } |
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107 |
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108 static const octave_value *indexed_object = 0; |
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109 static int index_position = 0; |
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110 |
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111 DEFCONSTFUN (__end__, , , |
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112 "internal function") |
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113 { |
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114 octave_value retval; |
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115 |
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116 if (indexed_object) |
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117 { |
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118 switch (index_position) |
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119 { |
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120 case -1: |
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121 // XXX FIXME XXX -- we really want "numel" here. |
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122 { |
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123 int nr = indexed_object->rows (); |
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124 int nc = indexed_object->columns (); |
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125 |
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126 if (nr < 0 || nc < 0) |
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127 ::error ("invalid use of end"); |
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128 else |
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129 retval = nr * nc; |
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130 } |
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131 break; |
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132 |
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133 case 0: |
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134 { |
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135 int nr = indexed_object->rows (); |
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136 |
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137 if (nr < 0) |
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138 ::error ("invalid use of end"); |
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139 else |
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140 retval = nr; |
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141 } |
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142 break; |
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143 |
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144 case 1: |
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145 { |
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146 int nc = indexed_object->columns (); |
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147 |
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148 if (nc < 0) |
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149 ::error ("invalid use of end"); |
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150 else |
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151 retval = nc; |
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152 } |
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153 break; |
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154 |
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155 default: |
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156 ::error ("__end__: internal error"); |
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157 break; |
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158 } |
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159 } |
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160 else |
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161 ::error ("invalid use of end"); |
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162 |
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163 return retval; |
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164 } |
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165 |
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166 octave_value_list |
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167 tree_argument_list::convert_to_const_vector (const octave_value *object) |
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168 { |
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169 // END doesn't make sense for functions. Maybe we need a different |
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170 // way of asking an octave_value object this question? |
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171 |
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172 bool stash_object = (list_includes_magic_end |
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173 && object && object->is_constant ()); |
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174 |
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175 if (stash_object) |
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176 { |
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177 unwind_protect::begin_frame ("convert_to_const_vector"); |
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178 |
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179 unwind_protect_ptr (indexed_object); |
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180 |
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181 indexed_object = object; |
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182 } |
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183 |
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184 int len = length (); |
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185 |
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186 // XXX FIXME XXX -- would be nice to know in advance how largs args |
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187 // needs to be even when we have a list containing an all_va_args |
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188 // token. |
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189 |
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190 octave_value_list args; |
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191 int args_len = len; |
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192 args.resize (args_len); |
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193 |
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194 iterator p = begin (); |
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195 int j = 0; |
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196 for (int k = 0; k < len; k++) |
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197 { |
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198 index_position = (len == 1) ? -1 : k; |
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199 |
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200 tree_expression *elt = *p++; |
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201 |
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202 if (elt) |
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203 { |
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204 octave_value tmp = elt->rvalue (); |
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205 |
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206 if (error_state) |
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207 { |
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208 ::error ("evaluating argument list element number %d", k+1); |
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209 args = octave_value_list (); |
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210 break; |
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211 } |
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212 else |
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213 { |
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214 if (tmp.is_all_va_args ()) |
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215 { |
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216 if (curr_function) |
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217 { |
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218 octave_value_list tva; |
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219 tva = curr_function->octave_all_va_args (); |
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220 int n = tva.length (); |
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221 args_len += n - 1; |
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222 args.resize (args_len); |
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223 for (int i = 0; i < n; i++) |
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224 args(j++) = tva(i); |
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225 } |
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226 else |
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227 { |
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228 ::error ("all_va_args is only valid inside functions"); |
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229 args = octave_value_list (); |
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230 break; |
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231 } |
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232 } |
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233 else if (tmp.is_cs_list ()) |
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234 { |
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235 octave_value_list tl = tmp.list_value (); |
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236 int n = tl.length (); |
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237 args_len += n - 1; |
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238 args.resize (args_len); |
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239 for (int i = 0; i < n; i++) |
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240 args(j++) = tl(i); |
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241 } |
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242 else |
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243 args(j++) = tmp; |
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244 } |
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245 } |
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246 else |
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247 { |
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248 args(j++) = octave_value (); |
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249 break; |
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250 } |
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251 } |
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252 |
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253 args.resize (j); |
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254 |
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255 if (stash_object) |
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256 unwind_protect::run_frame ("convert_to_const_vector"); |
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257 |
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258 return args; |
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259 } |
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260 |
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261 string_vector |
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262 tree_argument_list::get_arg_names (void) const |
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263 { |
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264 int len = length (); |
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265 |
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266 string_vector retval (len); |
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267 |
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268 int k = 0; |
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269 |
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270 for (const_iterator p = begin (); p != end (); p++) |
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271 { |
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272 tree_expression *elt = *p; |
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273 |
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274 retval(k++) = elt->str_print_code (); |
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275 } |
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276 |
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277 return retval; |
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278 } |
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279 |
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280 void |
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281 tree_argument_list::accept (tree_walker& tw) |
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282 { |
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283 tw.visit_argument_list (*this); |
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284 } |
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285 |
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286 /* |
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287 ;;; Local Variables: *** |
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288 ;;; mode: C++ *** |
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289 ;;; End: *** |
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290 */ |
