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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT COMPILER COMPONENTS --
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4 -- --
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5 -- W I D E C H A R --
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6 -- --
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7 -- B o d y --
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8 -- --
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131
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9 -- Copyright (C) 1992-2018, 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 -- Note: this package uses the generic subprograms in System.WCh_Cnv, which
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33 -- completely encapsulate the set of wide character encoding methods, so no
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34 -- modifications are required when adding new encoding methods.
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35
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36 with Opt; use Opt;
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37
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38 with System.WCh_Cnv; use System.WCh_Cnv;
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39 with System.WCh_Con; use System.WCh_Con;
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40
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41 package body Widechar is
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42
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43 ---------------------------
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44 -- Is_Start_Of_Wide_Char --
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45 ---------------------------
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46
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47 function Is_Start_Of_Wide_Char
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48 (S : Source_Buffer_Ptr;
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49 P : Source_Ptr) return Boolean
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50 is
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51 begin
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52 case Wide_Character_Encoding_Method is
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53
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54 -- For Hex mode, just test for an ESC character. The ESC character
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55 -- cannot appear in any other context in a legal Ada program.
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56
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57 when WCEM_Hex =>
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58 return S (P) = ASCII.ESC;
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59
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60 -- For brackets, just test ["x where x is a hex character. This is
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61 -- sufficient test, since this sequence cannot otherwise appear in a
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62 -- legal Ada program.
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63
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64 when WCEM_Brackets =>
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65 return P <= S'Last - 2
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66 and then S (P) = '['
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67 and then S (P + 1) = '"'
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68 and then (S (P + 2) in '0' .. '9'
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69 or else
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70 S (P + 2) in 'a' .. 'f'
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71 or else
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72 S (P + 2) in 'A' .. 'F');
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73
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74 -- All other encoding methods use the upper bit set in the first
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75 -- character to uniquely represent a wide character.
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76
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77 when WCEM_EUC
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78 | WCEM_Shift_JIS
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79 | WCEM_Upper
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80 | WCEM_UTF8
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81 =>
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82 return S (P) >= Character'Val (16#80#);
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83 end case;
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84 end Is_Start_Of_Wide_Char;
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85
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86 -----------------
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87 -- Length_Wide --
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88 -----------------
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89
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90 function Length_Wide return Nat is
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91 begin
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92 return WC_Longest_Sequence;
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93 end Length_Wide;
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94
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95 ---------------
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96 -- Scan_Wide --
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97 ---------------
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98
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99 procedure Scan_Wide
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100 (S : Source_Buffer_Ptr;
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101 P : in out Source_Ptr;
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102 C : out Char_Code;
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103 Err : out Boolean)
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104 is
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105 P_Init : constant Source_Ptr := P;
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106 Chr : Character;
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107
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108 function In_Char return Character;
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109 -- Function to obtain characters of wide character escape sequence
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110
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111 -------------
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112 -- In_Char --
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113 -------------
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114
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115 function In_Char return Character is
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116 begin
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117 P := P + 1;
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118 return S (P - 1);
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119 end In_Char;
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120
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121 function WC_In is new Char_Sequence_To_UTF_32 (In_Char);
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122
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123 -- Start of processing for Scan_Wide
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124
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125 begin
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126 Chr := In_Char;
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127
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128 -- Scan out the wide character. If the first character is a bracket,
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129 -- we allow brackets encoding regardless of the standard encoding
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130 -- method being used, but otherwise we use this standard method.
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131
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132 if Chr = '[' then
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133 C := Char_Code (WC_In (Chr, WCEM_Brackets));
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134 else
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135 C := Char_Code (WC_In (Chr, Wide_Character_Encoding_Method));
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136 end if;
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137
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138 Err := False;
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139 Wide_Char_Byte_Count := Wide_Char_Byte_Count + Nat (P - P_Init - 1);
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140
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141 exception
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142 when Constraint_Error =>
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143 C := Char_Code (0);
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144 P := P - 1;
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145 Err := True;
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146 end Scan_Wide;
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147
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148 --------------
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149 -- Set_Wide --
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150 --------------
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151
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152 procedure Set_Wide
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153 (C : Char_Code;
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154 S : in out String;
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155 P : in out Natural)
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156 is
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157 procedure Out_Char (C : Character);
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158 -- Procedure to store one character of wide character sequence
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159
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160 --------------
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161 -- Out_Char --
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162 --------------
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163
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164 procedure Out_Char (C : Character) is
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165 begin
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166 P := P + 1;
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167 S (P) := C;
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168 end Out_Char;
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169
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170 procedure WC_Out is new UTF_32_To_Char_Sequence (Out_Char);
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171
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172 -- Start of processing for Set_Wide
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173
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174 begin
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175 WC_Out (UTF_32_Code (C), Wide_Character_Encoding_Method);
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176 end Set_Wide;
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177
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178 ---------------
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179 -- Skip_Wide --
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180 ---------------
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181
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182 procedure Skip_Wide (S : String; P : in out Natural) is
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183 P_Init : constant Natural := P;
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184
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185 function Skip_Char return Character;
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186 -- Function to skip one character of wide character escape sequence
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187
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188 ---------------
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189 -- Skip_Char --
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190 ---------------
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191
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192 function Skip_Char return Character is
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193 begin
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194 P := P + 1;
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195 return S (P - 1);
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196 end Skip_Char;
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197
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198 function WC_Skip is new Char_Sequence_To_UTF_32 (Skip_Char);
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199
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200 Discard : UTF_32_Code;
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201 pragma Warnings (Off, Discard);
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202
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203 -- Start of processing for Skip_Wide
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204
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205 begin
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206 Discard := WC_Skip (Skip_Char, Wide_Character_Encoding_Method);
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207 Wide_Char_Byte_Count := Wide_Char_Byte_Count + Nat (P - P_Init - 1);
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208 end Skip_Wide;
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209
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210 ---------------
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211 -- Skip_Wide --
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212 ---------------
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213
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214 procedure Skip_Wide (S : Source_Buffer_Ptr; P : in out Source_Ptr) is
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215 P_Init : constant Source_Ptr := P;
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216
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217 function Skip_Char return Character;
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218 -- Function to skip one character of wide character escape sequence
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219
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220 ---------------
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221 -- Skip_Char --
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222 ---------------
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223
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224 function Skip_Char return Character is
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225 begin
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226 P := P + 1;
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227 return S (P - 1);
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228 end Skip_Char;
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229
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230 function WC_Skip is new Char_Sequence_To_UTF_32 (Skip_Char);
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231
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232 Discard : UTF_32_Code;
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233 pragma Warnings (Off, Discard);
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234
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235 -- Start of processing for Skip_Wide
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236
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237 begin
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238 Discard := WC_Skip (Skip_Char, Wide_Character_Encoding_Method);
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239 Wide_Char_Byte_Count := Wide_Char_Byte_Count + Nat (P - P_Init - 1);
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240 end Skip_Wide;
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241
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242 end Widechar;
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