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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT RUN-TIME COMPONENTS --
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4 -- --
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5 -- A D A . W I D E _ T E X T _ I O . E N U M E R A T I O N _ A U X --
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6 -- --
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7 -- B o d y --
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8 -- --
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145
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9 -- Copyright (C) 1992-2019, Free Software Foundation, Inc. --
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111
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10 -- --
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11 -- GNAT is free software; you can redistribute it and/or modify it under --
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12 -- terms of the GNU General Public License as published by the Free Soft- --
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13 -- ware Foundation; either version 3, or (at your option) any later ver- --
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14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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17 -- --
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18 -- As a special exception under Section 7 of GPL version 3, you are granted --
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19 -- additional permissions described in the GCC Runtime Library Exception, --
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20 -- version 3.1, as published by the Free Software Foundation. --
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21 -- --
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22 -- You should have received a copy of the GNU General Public License and --
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23 -- a copy of the GCC Runtime Library Exception along with this program; --
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24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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25 -- <http://www.gnu.org/licenses/>. --
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26 -- --
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27 -- GNAT was originally developed by the GNAT team at New York University. --
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28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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29 -- --
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30 ------------------------------------------------------------------------------
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31
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32 with Ada.Wide_Text_IO.Generic_Aux; use Ada.Wide_Text_IO.Generic_Aux;
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33 with Ada.Characters.Handling; use Ada.Characters.Handling;
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34 with Interfaces.C_Streams; use Interfaces.C_Streams;
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35 with System.WCh_Con; use System.WCh_Con;
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36
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37 package body Ada.Wide_Text_IO.Enumeration_Aux is
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38
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39 subtype TFT is Ada.Wide_Text_IO.File_Type;
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40 -- File type required for calls to routines in Aux
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41
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42 -----------------------
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43 -- Local Subprograms --
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44 -----------------------
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45
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46 procedure Store_Char
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47 (WC : Wide_Character;
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48 Buf : out Wide_String;
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49 Ptr : in out Integer);
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50 -- Store a single character in buffer, checking for overflow
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51
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52 -- These definitions replace the ones in Ada.Characters.Handling, which
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53 -- do not seem to work for some strange not understood reason ??? at
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54 -- least in the OS/2 version.
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55
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56 function To_Lower (C : Character) return Character;
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57
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58 ------------------
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59 -- Get_Enum_Lit --
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60 ------------------
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61
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62 procedure Get_Enum_Lit
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63 (File : File_Type;
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64 Buf : out Wide_String;
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65 Buflen : out Natural)
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66 is
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67 ch : int;
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68 WC : Wide_Character;
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69
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70 begin
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71 Buflen := 0;
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72 Load_Skip (TFT (File));
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73 ch := Nextc (TFT (File));
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74
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75 -- Character literal case. If the initial character is a quote, then
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76 -- we read as far as we can without backup (see ACVC test CE3905L)
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77
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78 if ch = Character'Pos (''') then
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79 Get (File, WC);
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80 Store_Char (WC, Buf, Buflen);
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81
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82 ch := Nextc (TFT (File));
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83
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84 if ch = LM or else ch = EOF then
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85 return;
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86 end if;
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87
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88 Get (File, WC);
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89 Store_Char (WC, Buf, Buflen);
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90
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91 ch := Nextc (TFT (File));
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92
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93 if ch /= Character'Pos (''') then
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94 return;
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95 end if;
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96
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97 Get (File, WC);
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98 Store_Char (WC, Buf, Buflen);
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99
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100 -- Similarly for identifiers, read as far as we can, in particular,
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101 -- do read a trailing underscore (again see ACVC test CE3905L to
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102 -- understand why we do this, although it seems somewhat peculiar).
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103
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104 else
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105 -- Identifier must start with a letter. Any wide character value
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106 -- outside the normal Latin-1 range counts as a letter for this.
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107
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108 if ch < 255 and then not Is_Letter (Character'Val (ch)) then
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109 return;
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110 end if;
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111
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112 -- If we do have a letter, loop through the characters quitting on
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113 -- the first non-identifier character (note that this includes the
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114 -- cases of hitting a line mark or page mark).
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115
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116 loop
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117 Get (File, WC);
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118 Store_Char (WC, Buf, Buflen);
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119
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120 ch := Nextc (TFT (File));
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121
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122 exit when ch = EOF;
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123
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124 if ch = Character'Pos ('_') then
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125 exit when Buf (Buflen) = '_';
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126
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127 elsif ch = Character'Pos (ASCII.ESC) then
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128 null;
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129
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130 elsif File.WC_Method in WC_Upper_Half_Encoding_Method
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131 and then ch > 127
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132 then
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133 null;
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134
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135 else
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136 exit when not Is_Letter (Character'Val (ch))
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137 and then
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138 not Is_Digit (Character'Val (ch));
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139 end if;
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140 end loop;
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141 end if;
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142 end Get_Enum_Lit;
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143
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144 ---------
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145 -- Put --
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146 ---------
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147
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148 procedure Put
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149 (File : File_Type;
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150 Item : Wide_String;
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151 Width : Field;
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152 Set : Type_Set)
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153 is
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154 Actual_Width : constant Integer :=
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155 Integer'Max (Integer (Width), Item'Length);
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156
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157 begin
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158 Check_On_One_Line (TFT (File), Actual_Width);
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159
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160 if Set = Lower_Case and then Item (Item'First) /= ''' then
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161 declare
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162 Iteml : Wide_String (Item'First .. Item'Last);
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163
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164 begin
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165 for J in Item'Range loop
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166 if Is_Character (Item (J)) then
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167 Iteml (J) :=
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168 To_Wide_Character (To_Lower (To_Character (Item (J))));
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169 else
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170 Iteml (J) := Item (J);
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171 end if;
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172 end loop;
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173
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174 Put (File, Iteml);
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175 end;
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176
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177 else
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178 Put (File, Item);
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179 end if;
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180
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181 for J in 1 .. Actual_Width - Item'Length loop
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182 Put (File, ' ');
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183 end loop;
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184 end Put;
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185
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186 ----------
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187 -- Puts --
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188 ----------
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189
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190 procedure Puts
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191 (To : out Wide_String;
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192 Item : Wide_String;
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193 Set : Type_Set)
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194 is
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195 Ptr : Natural;
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196
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197 begin
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198 if Item'Length > To'Length then
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199 raise Layout_Error;
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200
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201 else
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202 Ptr := To'First;
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203 for J in Item'Range loop
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204 if Set = Lower_Case
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205 and then Item (Item'First) /= '''
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206 and then Is_Character (Item (J))
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207 then
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208 To (Ptr) :=
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209 To_Wide_Character (To_Lower (To_Character (Item (J))));
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210 else
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211 To (Ptr) := Item (J);
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212 end if;
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213
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214 Ptr := Ptr + 1;
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215 end loop;
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216
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217 while Ptr <= To'Last loop
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218 To (Ptr) := ' ';
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219 Ptr := Ptr + 1;
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220 end loop;
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221 end if;
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222 end Puts;
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223
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224 -------------------
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225 -- Scan_Enum_Lit --
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226 -------------------
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227
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228 procedure Scan_Enum_Lit
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229 (From : Wide_String;
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230 Start : out Natural;
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231 Stop : out Natural)
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232 is
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233 WC : Wide_Character;
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234
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235 -- Processing for Scan_Enum_Lit
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236
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237 begin
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238 Start := From'First;
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239
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240 loop
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241 if Start > From'Last then
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242 raise End_Error;
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243
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244 elsif Is_Character (From (Start))
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245 and then not Is_Blank (To_Character (From (Start)))
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246 then
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247 exit;
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248
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249 else
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250 Start := Start + 1;
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251 end if;
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252 end loop;
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253
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254 -- Character literal case. If the initial character is a quote, then
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255 -- we read as far as we can without backup (see ACVC test CE3905L
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256 -- which is for the analogous case for reading from a file).
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257
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258 if From (Start) = ''' then
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259 Stop := Start;
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260
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261 if Stop = From'Last then
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262 raise Data_Error;
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263 else
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264 Stop := Stop + 1;
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265 end if;
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266
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267 if From (Stop) in ' ' .. '~'
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268 or else From (Stop) >= Wide_Character'Val (16#80#)
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269 then
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270 if Stop = From'Last then
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271 raise Data_Error;
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272 else
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273 Stop := Stop + 1;
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274
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275 if From (Stop) = ''' then
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276 return;
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277 end if;
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278 end if;
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279 end if;
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280
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281 raise Data_Error;
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282
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283 -- Similarly for identifiers, read as far as we can, in particular,
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284 -- do read a trailing underscore (again see ACVC test CE3905L to
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285 -- understand why we do this, although it seems somewhat peculiar).
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286
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287 else
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288 -- Identifier must start with a letter, any wide character outside
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289 -- the normal Latin-1 range is considered a letter for this test.
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290
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291 if Is_Character (From (Start))
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292 and then not Is_Letter (To_Character (From (Start)))
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293 then
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294 raise Data_Error;
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295 end if;
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296
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297 -- If we do have a letter, loop through the characters quitting on
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298 -- the first non-identifier character (note that this includes the
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299 -- cases of hitting a line mark or page mark).
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300
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301 Stop := Start + 1;
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302 while Stop < From'Last loop
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303 WC := From (Stop + 1);
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304
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305 exit when
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306 Is_Character (WC)
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307 and then
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308 not Is_Letter (To_Character (WC))
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309 and then
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310 (WC /= '_' or else From (Stop - 1) = '_');
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311
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312 Stop := Stop + 1;
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313 end loop;
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314 end if;
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315
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316 end Scan_Enum_Lit;
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317
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318 ----------------
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319 -- Store_Char --
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320 ----------------
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321
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322 procedure Store_Char
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323 (WC : Wide_Character;
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324 Buf : out Wide_String;
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325 Ptr : in out Integer)
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326 is
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327 begin
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328 if Ptr = Buf'Last then
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329 raise Data_Error;
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330 else
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331 Ptr := Ptr + 1;
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332 Buf (Ptr) := WC;
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333 end if;
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334 end Store_Char;
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335
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336 --------------
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337 -- To_Lower --
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338 --------------
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339
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340 function To_Lower (C : Character) return Character is
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341 begin
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342 if C in 'A' .. 'Z' then
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343 return Character'Val (Character'Pos (C) + 32);
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344 else
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345 return C;
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346 end if;
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347 end To_Lower;
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348
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349 end Ada.Wide_Text_IO.Enumeration_Aux;
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