在Richedit上进行Delphi代码语法加亮显示

最新推荐文章于 2022-12-02 18:59:16 发布

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最新推荐文章于 2022-12-02 18:59:16 发布

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原文链接：http://www.cnblogs.com/xiaoxingchi/archive/2010/01/17/1649996.html

本文介绍了一个用于在富文本编辑器中实现代码高亮显示的实用程序，该程序支持多种编程语言关键字的颜色标记，并提供了不同的样式主题选项。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

procedure CodeColors(Form : TForm;Style : String; RichE : TRichedit;InVisible : Boolean);
const
// symbols...
CodeC1: array[0..20] of String = ('#','$','(',')','*',',',
'.','/',':',';','[',']','{','}','<','>',
'-','=','+','''','@');
// reserved words...
CodeC2: array[0..44] of String = ('and','as','begin',
'case','char','class','const','downto',
'else','end','except','finally','for',
'forward','function','if','implementation','interface',
'is','nil','or','private','procedure','public','raise',
'repeat','string','to','try','type','unit','uses','var',
'while','external','stdcall','do','until','array','of',
'in','shr','shl','cos','div');
var
FoundAt : LongInt;
StartPos, ToEnd, i : integer;
OldCap,T : String;
FontC, BackC, C1, C2 ,C3 ,strC, strC1 : TColor;
begin
OldCap := Form.Caption;
with RichE do
begin
Font.Name := 'Courier New';
Font.Size := 10;
if WordWrap then WordWrap := false;
SelectAll;
SelAttributes.color := clBlack;
SelAttributes.Style := [];
SelStart := 0;
if InVisible then
begin
Visible := False;
Form.Caption := 'Executing Code Coloring...';
end;
end;

BackC := clWhite; FontC := clBlack;
C1 := clBlack; C2 := clBlack; C3 := clBlack;
strC := clBlue; strC1 := clSilver;

if Style = 'Twilight' then
begin
BackC := clBlack; FontC := clWhite;
C1 := clLime; C2 := clSilver; C3 := clAqua;
strC := clYellow; strC1 := clRed;
end
else
if Style = 'Default' then
begin
BackC := clWhite; FontC := clBlack;
C1 := clTeal; C2 := clMaroon; C3 := clBlue;
strC := clMaroon; strC1 := clSilver;
end
else
if Style = 'Ocean' then
begin
BackC := $00FFFF80; FontC := clBlack;
C1 := clMaroon; C2 := clBlack; C3 := clBlue;
strC := clTeal; strC1 := clBlack;
end
else
if Style = 'Classic' then
begin
BackC := clNavy; FontC := clYellow;
C1 := clLime; C2 := clSilver; C3 := clWhite;
strC := clAqua; strC1 := clSilver;
end
else
begin
with RichE do
begin
T := '{'+Style+' = Invalid Style [Default,Classic,Twilight,Ocean] ONLY! }';
Lines.Insert(0,T);
StartPos := 0;
ToEnd := Length(Text) - StartPos;
FoundAt := FindText(T, StartPos, ToEnd, [stWholeWord]);
SelStart := FoundAt;
SelLength := Length(T);
SelAttributes.Color := clRed;
SelAttributes.Style := [fsBold];
StartPos := 0;
ToEnd := Length(Text) - StartPos;
FoundAt := FindText('ONLY!', StartPos, ToEnd, [stWholeWord]);
SelStart := FoundAt;
SelLength := 4;
SelAttributes.Color := clRed;
SelAttributes.Style := [fsBold,fsUnderLine];
end;
end;

RichE.SelectAll;
RichE.color := BackC;
RichE.SelAttributes.color := FontC;

for i := 0 to 100 do
begin
with RichE do
begin
StartPos := 0;
ToEnd := Length(Text) - StartPos;
FoundAt := FindText(IntToStr(i), StartPos, ToEnd, [stWholeWord]);
while (FoundAt <> -1) do
begin
SelStart := FoundAt;
SelLength := Length(IntToStr(i));
SelAttributes.Color := C1;
SelAttributes.Style := [];
StartPos := FoundAt + Length(IntToStr(i));
FoundAt := FindText(IntToStr(i), StartPos, ToEnd, [stWholeWord]);
end;
end;
end;
for i := 0 to 20 do
begin
with RichE do
begin
StartPos := 0;
ToEnd := Length(Text) - StartPos;
FoundAt := FindText(CodeC1[i], StartPos, ToEnd, []);
while (FoundAt <> -1) do
begin
SelStart := FoundAt;
SelLength := Length(CodeC1[i]);
SelAttributes.Color := C2;
StartPos := FoundAt + Length(CodeC1[i]);
FoundAt := FindText(CodeC1[i], StartPos, ToEnd, []);
end;
end;
end;
for i := 0 to 44 do
begin
with RichE do
begin
StartPos := 0;
ToEnd := Length(Text) - StartPos;
FoundAt := FindText(CodeC2[i], StartPos, ToEnd, [stWholeWord]);
while (FoundAt <> -1) do
begin
SelStart := FoundAt;
SelLength := Length(CodeC2[i]);
SelAttributes.Color := C3;
SelAttributes.Style := [fsBold];
StartPos := FoundAt + Length(CodeC2[i]);
FoundAt := FindText(CodeC2[i], StartPos, ToEnd, [stWholeWord]);
end;
end;
end;
Startpos := 0;
with RichE do
begin
FoundAt := FindText('''', StartPos, Length(Text), []);
while FoundAt <> -1 do
begin
SelStart := FoundAt;
Startpos := FoundAt+1;
FoundAt := FindText('''', StartPos, Length(Text), []);
if FoundAt <> -1 then
begin
SelLength := (FoundAt - selstart)+1;
SelAttributes.Style := [];
SelAttributes.Color := strC;
StartPos := FoundAt+1;
FoundAt := FindText('''', StartPos, Length(Text), []);
end;
end;
end;

Startpos := 0;
with RichE do
begin
FoundAt := FindText('{', StartPos, Length(Text), []);
while FoundAt <> -1 do
begin
SelStart := FoundAt;
Startpos := FoundAt+1;
FoundAt := FindText('}', StartPos, Length(Text), []);
if FoundAt <> -1 then
begin
SelLength := (FoundAt - selstart)+1;
SelAttributes.Style := [];
SelAttributes.Color := strC1;
StartPos := FoundAt+1;
FoundAt := FindText('{', StartPos, Length(Text), []);
end;
end;
end;

if InVisible then
begin
RichE.Visible := True;
Form.Caption := OldCap;
end;
RichE.SelStart := 0;
end;

转载于:https://www.cnblogs.com/xiaoxingchi/archive/2010/01/17/1649996.html