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