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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 -- O U T P U T --
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6 -- --
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7 -- S p e c --
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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 -- This package contains low level output routines used by the compiler for
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33 -- writing error messages and informational output. It is also used by the
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34 -- debug source file output routines (see Sprint.Print_Debug_Line).
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35
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36 with Hostparm;
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37 with Types; use Types;
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38
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39 pragma Warnings (Off);
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40 -- This package is used also by gnatcoll
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41 with System.OS_Lib; use System.OS_Lib;
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42 pragma Warnings (On);
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43
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44 package Output is
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45 pragma Elaborate_Body;
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46
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47 type Output_Proc is access procedure (S : String);
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48 -- This type is used for the Set_Special_Output procedure. If Output_Proc
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49 -- is called, then instead of lines being written to standard error or
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50 -- standard output, a call is made to the given procedure for each line,
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51 -- passing the line with an end of line character (which is a single
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52 -- ASCII.LF character, even in systems which normally use CR/LF or some
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53 -- other sequence for line end).
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54
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55 -----------------
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56 -- Subprograms --
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57 -----------------
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58
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59 procedure Set_Special_Output (P : Output_Proc);
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60 -- Sets subsequent output to call procedure P. If P is null, then the call
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61 -- cancels the effect of a previous call, reverting the output to standard
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62 -- error or standard output depending on the mode at the time of previous
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63 -- call. Any exception generated by calls to P is simply propagated to
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64 -- the caller of the routine causing the write operation.
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65
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66 procedure Cancel_Special_Output;
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67 -- Cancels the effect of a call to Set_Special_Output, if any. The output
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68 -- is then directed to standard error or standard output depending on the
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69 -- last call to Set_Standard_Error or Set_Standard_Output. It is never an
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70 -- error to call Cancel_Special_Output. It has the same effect as calling
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71 -- Set_Special_Output (null).
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72
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73 procedure Ignore_Output (S : String);
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74 -- Does nothing. To disable output, pass Ignore_Output'Access to
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75 -- Set_Special_Output.
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76
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77 procedure Set_Standard_Error;
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78 -- Sets subsequent output to appear on the standard error file (whatever
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79 -- that might mean for the host operating system, if anything) when
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80 -- no special output is in effect. When a special output is in effect,
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81 -- the output will appear on standard error only after special output
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82 -- has been cancelled.
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83
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84 procedure Set_Standard_Output;
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85 -- Sets subsequent output to appear on the standard output file (whatever
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86 -- that might mean for the host operating system, if anything) when no
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87 -- special output is in effect. When a special output is in effect, the
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88 -- output will appear on standard output only after special output has been
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89 -- cancelled. Output to standard output is the default mode before any call
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90 -- to either of the Set procedures.
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91
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92 procedure Set_Output (FD : File_Descriptor);
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93 -- Sets subsequent output to appear on the given file descriptor when no
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94 -- special output is in effect. When a special output is in effect, the
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95 -- output will appear on the given file descriptor only after special
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96 -- output has been cancelled.
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97
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98 procedure Indent;
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99 -- Increases the current indentation level. Whenever a line is written
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100 -- (triggered by Eol), an appropriate amount of whitespace is added to the
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101 -- beginning of the line, wrapping around if it gets too long.
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102
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103 procedure Outdent;
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104 -- Decreases the current indentation level
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105
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106 procedure Write_Char (C : Character);
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107 -- Write one character to the standard output file. If the character is LF,
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108 -- this is equivalent to Write_Eol.
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109
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110 procedure Write_Erase_Char (C : Character);
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111 -- If last character in buffer matches C, erase it, otherwise no effect
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112
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113 procedure Write_Eol;
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114 -- Write an end of line (whatever is required by the system in use, e.g.
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115 -- CR/LF for DOS, or LF for Unix) to the standard output file. This routine
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116 -- also empties the line buffer, actually writing it to the file. Note that
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117 -- Write_Eol is the only routine that causes any actual output to be
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118 -- written. Trailing spaces are removed.
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119
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120 procedure Write_Eol_Keep_Blanks;
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121 -- Similar as Write_Eol, except that trailing spaces are not removed
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122
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123 procedure Write_Int (Val : Int);
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124 -- Write an integer value with no leading blanks or zeroes. Negative values
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125 -- are preceded by a minus sign).
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126
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127 procedure Write_Spaces (N : Nat);
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128 -- Write N spaces
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129
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130 procedure Write_Str (S : String);
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131 -- Write a string of characters to the standard output file. Note that
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132 -- end of line is normally handled separately using WRITE_EOL, but it is
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133 -- allowable for the string to contain LF (but not CR) characters, which
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134 -- are properly interpreted as end of line characters. The string may also
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135 -- contain horizontal tab characters.
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136
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137 procedure Write_Line (S : String);
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138 -- Equivalent to Write_Str (S) followed by Write_Eol;
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139
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140 function Last_Char return Character;
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141 -- Returns last character written on the current line, or null if the
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142 -- current line is (so far) empty.
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143
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144 procedure Delete_Last_Char;
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145 -- Deletes last character written on the current line, no effect if the
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146 -- current line is (so far) empty.
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147
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148 function Column return Pos;
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149 pragma Inline (Column);
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150 -- Returns the number of the column about to be written (e.g. a value of 1
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151 -- means the current line is empty).
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152
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153 -------------------------
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154 -- Buffer Save/Restore --
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155 -------------------------
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156
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157 -- This facility allows the current line buffer to be saved and restored
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158
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159 type Saved_Output_Buffer is private;
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160 -- Type used for Save/Restore_Buffer
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161
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162 Buffer_Max : constant := Hostparm.Max_Line_Length;
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163 -- Maximal size of a buffered output line
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164
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165 function Save_Output_Buffer return Saved_Output_Buffer;
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166 -- Save current line buffer and reset line buffer to empty
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167
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168 procedure Restore_Output_Buffer (S : Saved_Output_Buffer);
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169 -- Restore previously saved output buffer. The value in S is not affected
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170 -- so it is legitimate to restore a buffer more than once.
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171
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172 --------------------------
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173 -- Debugging Procedures --
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174 --------------------------
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175
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176 -- The following procedures are intended only for debugging purposes,
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177 -- for temporary insertion into the text in environments where a debugger
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178 -- is not available. They all have non-standard very short lower case
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179 -- names, precisely to make sure that they are only used for debugging.
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180
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181 procedure w (C : Character);
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182 -- Dump quote, character, quote, followed by line return
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183
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184 procedure w (S : String);
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185 -- Dump string followed by line return
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186
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187 procedure w (V : Int);
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188 -- Dump integer followed by line return
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189
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190 procedure w (B : Boolean);
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191 -- Dump Boolean followed by line return
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192
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193 procedure w (L : String; C : Character);
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194 -- Dump contents of string followed by blank, quote, character, quote
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195
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196 procedure w (L : String; S : String);
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197 -- Dump two strings separated by blanks, followed by line return
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198
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199 procedure w (L : String; V : Int);
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200 -- Dump contents of string followed by blank, integer, line return
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201
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202 procedure w (L : String; B : Boolean);
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203 -- Dump contents of string followed by blank, Boolean, line return
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204
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205 private
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206
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207 type Saved_Output_Buffer is record
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208 Buffer : String (1 .. Buffer_Max + 1);
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209 Next_Col : Positive;
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210 Cur_Indentation : Natural;
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211 end record;
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212
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213 end Output;
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