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{
"SHEdit" - Text editor with syntax highlighting
Copyright (C) 1999-2000 by Sebastian Guenther (sg@freepascal.org)
See the file COPYING.FPC, included in this distribution,
for details about the copyright.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
}
// Syntax highlighting class for Pascal sources
// !!! Slightly modified version for fpDoc !!!
{$MODE objfpc}
{$H+}
{$IFDEF Debug}
{$ASSERTIONS On}
{$ENDIF}
unit sh_pas;
interface
const
LF_SH_Valid = $01;
LF_SH_Multiline1 = $02;
LF_SH_Multiline2 = $04;
LF_SH_Multiline3 = $08;
LF_SH_Multiline4 = $10;
LF_SH_Multiline5 = $20;
LF_SH_Multiline6 = $40;
LF_SH_Multiline7 = $80;
LF_Escape = #10;
shDefault = 1;
shInvalid = 2;
shSymbol = 3;
shKeyword = 4;
shComment = 5;
shDirective = 6;
shNumbers = 7;
shCharacters = 8;
shStrings = 9;
shAssembler = 10;
procedure DoPascalHighlighting(var flags: Byte; source, dest: PChar);
implementation
uses Strings;
const
LF_SH_Comment1 = LF_SH_Multiline1; { Normal braced Comments}
LF_SH_Comment2 = LF_SH_Multiline2; { (* *) Comments}
LF_SH_Asm = LF_SH_Multiline3;
MaxKeywordLength = 15;
MaxKeyword = 60;
KeywordTable: array[0..MaxKeyword] of PChar =
('AND', 'ARRAY', 'ASM', 'ASSEMBLER',
'BEGIN', 'BREAK',
'CASE', 'CONST', 'CONSTRUCTOR', 'CLASS',
'DEFAULT', 'DESTRUCTOR', 'DIV', 'DO', 'DOWNTO',
'ELSE', 'END', 'EXCEPT', 'EXIT',
'FINALIZATION', 'FINALLY', 'FOR', 'FUNCTION',
'GOTO',
'IF', 'IMPLEMENTATION', 'IN', 'INHERITED', 'INITIALIZATION', 'INTERFACE',
'NIL', 'NOT',
'OBJECT', 'OF', 'ON', 'OR', 'OVERRIDE',
'PACKED', 'PRIVATE', 'PROCEDURE', 'PROGRAM', 'PROPERTY', 'PROTECTED',
'PUBLIC', 'PUBLISHED',
'RAISE', 'RECORD', 'REPEAT', 'RESOURCESTRING',
'SET',
'THEN', 'TRY', 'TYPE',
'UNIT', 'UNTIL', 'USES',
'VAR', 'VIRTUAL',
'WHILE', 'WITH',
'XOR');
KeywordAsmIndex = 2;
procedure DoPascalHighlighting(var flags: Byte; source, dest: PChar);
var
dp: Integer; // Destination position - current offset in dest
LastSHPos: Integer; // Position of last highlighting character, or 0
procedure AddSH(sh: Byte);
begin
ASSERT(sh > 0);
if (LastSHPos > 0) and (dp = LastSHPos + 1) then Dec(dp, 2);
dest[dp] := LF_Escape; Inc(dp);
LastSHPos := dp;
dest[dp] := Chr(sh); Inc(dp);
end;
procedure PutChar;
begin
dest[dp] := source[0]; Inc(dp); Inc(source);
end;
procedure ProcessComment1;
begin
while source[0] <> #0 do begin
if source[0] = '}' then begin
PutChar;
flags := flags and not LF_SH_Comment1;
AddSH(shDefault);
break;
end;
PutChar;
end;
end;
procedure ProcessComment2;
begin
while source[0] <> #0 do begin
if (source[0] = '*') and (source[1] = ')') then begin
PutChar; PutChar;
flags := flags and not LF_SH_Comment2;
AddSH(shDefault);
break;
end;
PutChar;
end;
end;
{ Checks if we are at the beginning of a comment (or directive) and processes
all types of comments and directives, or returns False }
function CheckForComment: Boolean;
begin
Result := True;
if source[0] = '{' then begin
if source[1] = '$' then
AddSH(shDirective)
else
AddSH(shComment);
PutChar;
flags := flags or LF_SH_Comment1;
ProcessComment1;
end else if (source[0] = '(') and (source[1] = '*') then begin
AddSH(shComment);
PutChar; PutChar;
flags := flags or LF_SH_Comment2;
ProcessComment2;
end else if (source[0] = '/') and (source[1] = '/') then begin
AddSH(shComment);
repeat PutChar until source[0] = #0;
AddSH(shDefault);
end else
Result := False;
end;
procedure ProcessAsm;
var
LastChar: Char;
begin
LastChar := ' ';
while source[0] <> #0 do begin
if (LastChar in [' ', #9, #10, #13]) and
(UpCase(source[0]) = 'E') and (UpCase(source[1]) = 'N') and
(UpCase(source[2]) = 'D') then begin
AddSH(shKeyword);
PutChar; PutChar; PutChar;
flags := flags and not LF_SH_Asm;
AddSH(shDefault);
break;
end else
if CheckForComment then LastChar := ' '
else begin
LastChar := source[0];
PutChar;
end;
end;
end;
procedure ProcessSymbol;
begin
AddSH(shSymbol);
if (source[0] = ':') and (source[1] = '=') then
PutChar;
PutChar;
AddSH(shDefault);
end;
function CheckForKeyword: Boolean;
var
keyword, ukeyword: array[0..MaxKeywordLength] of Char;
i, j: Integer;
begin
i := 0;
while (source[i] <> #0) and (i < MaxKeywordLength) and
(source[i] in ['0'..'9', 'A'..'Z', 'a'..'z']) do begin
keyword[i] := source[i];
ukeyword[i] := UpCase(source[i]);
Inc(i);
end;
keyword[i] := #0; ukeyword[i] := #0;
Result := False;
if i < MaxKeywordLength then
for j := 0 to MaxKeyword do
if StrIComp(KeywordTable[j], ukeyword) = 0 then begin
Result := True; break;
end;
if not Result then exit;
Inc(source, i);
AddSH(shKeyword);
StrCopy(dest + dp, keyword);
Inc(dp, i);
if j <> KeywordAsmIndex then
AddSH(shDefault)
else begin
AddSH(shAssembler);
flags := flags or LF_SH_Asm;
ProcessAsm;
end;
end;
var
StringLength: Integer;
begin
dp := 0;
LastSHPos := 0;
if (flags and LF_SH_Comment1) <> 0 then begin
AddSH(shComment);
ProcessComment1;
end;
if (flags and LF_SH_Comment2) <> 0 then begin
AddSH(shComment);
ProcessComment2;
end;
if (flags and LF_SH_Asm) <> 0 then begin
AddSH(shAssembler);
ProcessAsm;
end;
while source[0] <> #0 do begin
if CheckForComment then continue;
case source[0] of
',', ';', ':', '.', '(', ')', '[', ']', '<', '>', '=',
'*', '/', '+', '-', '^', '&', '@': ProcessSymbol;
'#': begin
AddSH(shCharacters);
PutChar;
if source[0] = '$' then PutChar;
while (source[0] >= '0') and (source[0] <= '9') do PutChar;
AddSH(shDefault);
end;
'$': begin
AddSH(shNumbers);
PutChar;
while source[0] in ['0'..'9', 'A'..'F', 'a'..'f'] do PutChar;
AddSH(shDefault);
end;
'0'..'9': begin
AddSH(shNumbers);
PutChar;
while (source[0] >= '0') and (source[0] <= '9') do PutChar;
AddSH(shDefault);
end;
'''': begin
AddSH(shStrings);
PutChar;
StringLength := 0;
while source[0] <> #0 do begin
if source[0] = '''' then
if source[1] = '''' then PutChar
else begin
PutChar; break;
end;
Inc(StringLength);
PutChar;
end;
if StringLength = 1 then
dest[LastSHPos] := Chr(shCharacters);
if (source[0] = #0) and (dest[dp - 1] <> '''') then
dest[LastSHPos] := Chr(shInvalid);
AddSH(shDefault);
end;
'_', 'A'..'Z', 'a'..'z': begin
if not CheckForKeyword then
repeat
PutChar
until not (source[0] in ['0'..'9', '_', 'A'..'Z', 'a'..'z']);
end;
' ': PutChar;
else begin
AddSH(shInvalid);
PutChar; // = found an invalid char!
AddSH(shDefault);
end;
end;
end;
dest[dp] := #0;
end;
end.
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