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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 "defun.h" |
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32 #include "error.h" |
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33 #include "ov.h" |
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34 #include "oct-lvalue.h" |
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35 #include "pt-id.h" |
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36 #include "pt-idx.h" |
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37 #include "pt-misc.h" |
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38 #include "pt-walk.h" |
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39 #include "utils.h" |
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40 |
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41 // If TRUE, print a warning if a function does not define all the |
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42 // values in the return list which are expected. |
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43 static bool Vwarn_undefined_return_values; |
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44 |
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45 // Parameter lists. |
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46 |
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47 tree_parameter_list::~tree_parameter_list (void) |
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48 { |
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49 while (! empty ()) |
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50 { |
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51 iterator p = begin (); |
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52 delete *p; |
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53 erase (p); |
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54 } |
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55 } |
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56 |
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57 void |
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58 tree_parameter_list::mark_as_formal_parameters (void) |
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59 { |
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60 for (iterator p = begin (); p != end (); p++) |
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61 { |
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62 tree_identifier *elt = *p; |
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63 elt->mark_as_formal_parameter (); |
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64 } |
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65 } |
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66 |
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67 void |
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68 tree_parameter_list::initialize_undefined_elements (const std::string& warnfor, |
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69 int nargout, |
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70 const octave_value& val) |
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71 { |
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72 bool warned = false; |
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73 |
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74 int count = 0; |
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75 |
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76 for (iterator p = begin (); p != end (); p++) |
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77 { |
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78 if (++count > nargout) |
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79 break; |
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80 |
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81 tree_identifier *elt = *p; |
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82 |
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83 if (! elt->is_defined ()) |
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84 { |
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85 if (Vwarn_undefined_return_values && ! warned) |
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86 { |
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87 warned = true; |
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88 warning ("%s: some elements in list of return values are undefined", |
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89 warnfor.c_str ()); |
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90 } |
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91 |
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92 octave_lvalue tmp = elt->lvalue (); |
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93 |
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94 tmp.assign (octave_value::op_asn_eq, val); |
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95 } |
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96 } |
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97 } |
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98 |
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99 void |
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100 tree_parameter_list::define_from_arg_vector (const octave_value_list& args) |
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101 { |
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102 int nargin = args.length (); |
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103 |
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104 if (nargin <= 0) |
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105 return; |
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106 |
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107 int expected_nargin = length (); |
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108 |
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109 iterator p = begin (); |
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110 |
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111 for (int i = 0; i < expected_nargin; i++) |
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112 { |
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113 tree_identifier *elt = *p++; |
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114 |
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115 octave_lvalue ref = elt->lvalue (); |
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116 |
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117 if (i < nargin) |
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118 { |
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119 if (args(i).is_defined () && args(i).is_magic_colon ()) |
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120 { |
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121 ::error ("invalid use of colon in function argument list"); |
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122 return; |
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123 } |
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124 |
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125 ref.assign (octave_value::op_asn_eq, args(i)); |
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126 } |
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127 else |
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128 ref.assign (octave_value::op_asn_eq, octave_value ()); |
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129 } |
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130 } |
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131 |
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132 void |
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133 tree_parameter_list::undefine (void) |
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134 { |
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135 int len = length (); |
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136 |
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137 iterator p = begin (); |
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138 |
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139 for (int i = 0; i < len; i++) |
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140 { |
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141 tree_identifier *elt = *p++; |
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142 |
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143 octave_lvalue ref = elt->lvalue (); |
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144 |
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145 ref.assign (octave_value::op_asn_eq, octave_value ()); |
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146 } |
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147 } |
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148 |
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149 octave_value_list |
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150 tree_parameter_list::convert_to_const_vector (tree_va_return_list *vr_list) |
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151 { |
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152 int nout = length (); |
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153 |
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154 if (vr_list) |
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155 nout += vr_list->length (); |
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156 |
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157 octave_value_list retval; |
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158 retval.resize (nout); |
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159 |
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160 int i = 0; |
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161 |
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162 for (iterator p = begin (); p != end (); p++) |
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163 { |
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164 tree_identifier *elt = *p; |
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165 |
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166 retval(i++) = elt->is_defined () ? elt->rvalue () : octave_value (); |
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167 } |
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168 |
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169 if (vr_list) |
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170 { |
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171 for (tree_va_return_list::iterator p = vr_list->begin (); |
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172 p != vr_list->end (); |
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173 p++) |
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174 { |
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175 retval(i++) = *p; |
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176 } |
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177 } |
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178 |
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179 return retval; |
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180 } |
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181 |
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182 bool |
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183 tree_parameter_list::is_defined (void) |
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184 { |
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185 bool status = true; |
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186 |
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187 for (iterator p = begin (); p != end (); p++) |
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188 { |
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189 tree_identifier *elt = *p; |
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190 |
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191 if (! elt->is_defined ()) |
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192 { |
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193 status = false; |
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194 break; |
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195 } |
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196 } |
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197 |
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198 return status; |
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199 } |
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200 |
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201 void |
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202 tree_parameter_list::accept (tree_walker& tw) |
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203 { |
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204 tw.visit_parameter_list (*this); |
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205 } |
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206 |
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207 // Return lists. |
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208 |
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209 tree_return_list::~tree_return_list (void) |
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210 { |
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211 while (! empty ()) |
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212 { |
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213 iterator p = begin (); |
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214 delete *p; |
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215 erase (p); |
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216 } |
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217 } |
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218 |
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219 void |
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220 tree_return_list::accept (tree_walker& tw) |
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221 { |
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222 tw.visit_return_list (*this); |
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223 } |
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224 |
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225 static int |
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226 warn_undefined_return_values (void) |
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227 { |
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228 Vwarn_undefined_return_values |
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229 = check_preference ("warn_undefined_return_values"); |
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230 |
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231 return 0; |
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232 } |
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233 |
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234 void |
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235 symbols_of_pt_misc (void) |
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236 { |
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237 DEFVAR (warn_undefined_return_values, true, warn_undefined_return_values, |
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238 "-*- texinfo -*-\n\ |
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239 @defvr {Built-in Variable} warn_undefined_return_values\n\ |
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240 If the value of @code{warn_undefined_return_values} is nonzero,\n\ |
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241 print a warning if a function does not define all the values in\n\ |
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242 the return list which are expected. The default value is 1.\n\ |
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243 @end defvr"); |
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244 } |
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245 |
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246 /* |
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247 ;;; Local Variables: *** |
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248 ;;; mode: C++ *** |
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249 ;;; End: *** |
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250 */ |
