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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, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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20 02110-1301, USA. |
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21 |
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22 */ |
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23 |
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24 #ifdef HAVE_CONFIG_H |
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25 #include <config.h> |
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26 #endif |
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27 |
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28 #include <iostream> |
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29 #include <string> |
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30 |
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31 #include "str-vec.h" |
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32 |
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33 #include "defun.h" |
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34 #include "error.h" |
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35 #include "oct-lvalue.h" |
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36 #include "oct-obj.h" |
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37 #include "ov.h" |
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38 #include "ov-usr-fcn.h" |
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39 #include "pt-arg-list.h" |
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40 #include "pt-exp.h" |
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41 #include "pt-pr-code.h" |
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42 #include "pt-walk.h" |
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43 #include "toplev.h" |
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44 #include "unwind-prot.h" |
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45 |
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46 // Argument lists. |
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47 |
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48 tree_argument_list::~tree_argument_list (void) |
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49 { |
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50 while (! empty ()) |
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51 { |
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52 iterator p = begin (); |
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53 delete *p; |
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54 erase (p); |
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55 } |
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56 } |
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57 |
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58 bool |
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59 tree_argument_list::has_magic_end (void) const |
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60 { |
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61 for (const_iterator p = begin (); p != end (); p++) |
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62 { |
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63 tree_expression *elt = *p; |
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64 |
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65 if (elt && elt->has_magic_end ()) |
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66 return true; |
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67 } |
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68 |
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69 return false; |
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70 } |
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71 |
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72 void |
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73 tree_argument_list::append (const element_type& s) |
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74 { |
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75 octave_base_list<tree_expression *>::append (s); |
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76 |
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77 if (! list_includes_magic_end && s && s->has_magic_end ()) |
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78 list_includes_magic_end = true; |
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79 } |
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80 |
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81 bool |
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82 tree_argument_list::all_elements_are_constant (void) const |
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83 { |
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84 for (const_iterator p = begin (); p != end (); p++) |
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85 { |
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86 tree_expression *elt = *p; |
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87 |
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88 if (! elt->is_constant ()) |
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89 return false; |
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90 } |
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91 |
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92 return true; |
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93 } |
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94 |
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95 static const octave_value *indexed_object = 0; |
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96 static int index_position = 0; |
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97 |
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98 DEFCONSTFUN (__end__, , , |
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99 "internal function") |
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100 { |
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101 octave_value retval; |
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102 |
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103 if (indexed_object) |
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104 { |
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105 dim_vector dv = indexed_object->dims (); |
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106 |
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107 switch (index_position) |
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108 { |
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109 case -1: |
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110 { |
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111 octave_idx_type numel = dv.numel (); |
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112 |
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113 if (numel < 0) |
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114 { |
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115 std::string dv_str = dv.str (); |
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116 ::error ("invalid use of end: (index 1, dims %s)", |
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117 dv_str.c_str ()); |
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118 } |
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119 else |
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120 retval = numel; |
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121 } |
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122 break; |
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123 |
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124 default: |
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125 { |
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126 |
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127 if (index_position < dv.length ()) |
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128 retval = dv(index_position); |
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129 else |
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130 retval = 1; |
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131 } |
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132 break; |
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133 } |
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134 } |
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135 else |
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136 ::error ("invalid use of end"); |
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137 |
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138 return retval; |
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139 } |
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140 |
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141 octave_value_list |
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142 tree_argument_list::convert_to_const_vector (const octave_value *object) |
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143 { |
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144 // END doesn't make sense for functions. Maybe we need a different |
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145 // way of asking an octave_value object this question? |
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146 |
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147 bool stash_object = (list_includes_magic_end |
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148 && object |
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149 && ! (object->is_function () |
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150 || object->is_function_handle ())); |
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151 |
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152 if (stash_object) |
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153 { |
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154 unwind_protect::begin_frame ("convert_to_const_vector"); |
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155 |
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156 unwind_protect_const_ptr (indexed_object); |
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157 |
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158 indexed_object = object; |
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159 } |
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160 |
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161 int len = length (); |
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162 |
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163 // FIXME -- would be nice to know in advance how largs args |
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164 // needs to be even when we have a list containing an all_va_args |
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165 // token. |
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166 |
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167 octave_value_list args; |
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168 int args_len = len; |
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169 args.resize (args_len); |
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170 |
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171 iterator p = begin (); |
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172 int j = 0; |
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173 for (int k = 0; k < len; k++) |
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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_int (index_position); |
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178 |
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179 index_position = (len == 1) ? -1 : k; |
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180 } |
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181 |
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182 tree_expression *elt = *p++; |
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183 |
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184 if (elt) |
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185 { |
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186 octave_value tmp = elt->rvalue (); |
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187 |
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188 if (error_state) |
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189 { |
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190 ::error ("evaluating argument list element number %d", k+1); |
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191 args = octave_value_list (); |
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192 break; |
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193 } |
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194 else |
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195 { |
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196 if (tmp.is_all_va_args ()) |
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197 { |
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198 octave_function *fcn = octave_call_stack::current (); |
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199 |
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200 if (fcn) |
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201 { |
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202 octave_value_list tva; |
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203 tva = fcn->octave_all_va_args (); |
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204 int n = tva.length (); |
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205 args_len += n - 1; |
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206 args.resize (args_len); |
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207 for (int i = 0; i < n; i++) |
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208 args(j++) = tva(i); |
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209 } |
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210 else |
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211 { |
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212 ::error ("all_va_args is only valid inside functions"); |
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213 args = octave_value_list (); |
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214 break; |
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215 } |
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216 } |
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217 else if (tmp.is_cs_list ()) |
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218 { |
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219 octave_value_list tl = tmp.list_value (); |
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220 int n = tl.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++) = tl(i); |
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225 } |
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226 else |
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227 args(j++) = tmp; |
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228 } |
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229 } |
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230 else |
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231 { |
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232 args(j++) = octave_value (); |
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233 break; |
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234 } |
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235 } |
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236 |
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237 args.resize (j); |
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238 |
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239 if (stash_object) |
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240 unwind_protect::run_frame ("convert_to_const_vector"); |
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241 |
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242 return args; |
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243 } |
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244 |
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245 std::list<octave_lvalue> |
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246 tree_argument_list::lvalue_list (void) |
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247 { |
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248 std::list<octave_lvalue> retval; |
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249 |
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250 for (tree_argument_list::iterator p = begin (); |
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251 p != end (); |
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252 p++) |
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253 { |
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254 tree_expression *elt = *p; |
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255 |
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256 retval.push_back (elt->lvalue ()); |
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257 } |
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258 |
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259 return retval; |
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260 } |
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261 |
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262 string_vector |
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263 tree_argument_list::get_arg_names (void) const |
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264 { |
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265 int len = length (); |
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266 |
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267 string_vector retval (len); |
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268 |
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269 int k = 0; |
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270 |
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271 for (const_iterator p = begin (); p != end (); p++) |
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272 { |
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273 tree_expression *elt = *p; |
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274 |
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275 retval(k++) = elt->str_print_code (); |
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276 } |
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277 |
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278 return retval; |
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279 } |
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280 |
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281 void |
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282 tree_argument_list::accept (tree_walker& tw) |
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283 { |
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284 tw.visit_argument_list (*this); |
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285 } |
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286 |
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287 /* |
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288 ;;; Local Variables: *** |
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289 ;;; mode: C++ *** |
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290 ;;; End: *** |
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291 */ |
