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|
NO_WARNINGS_BEGIN
internal inline b32
IsWhiteSpace(rune Character)
{
return (Character == '\n' || Character == '\r' ||
Character == ' ' || Character == '\t');
}
internal b32
IsDelimiter(rune Character)
{
for(s32 Index = 0; Index < ArrayCount(Delimiters); ++Index)
{
if(Delimiters[Index] == Character)
{
return 1;
}
}
return 0;
}
internal inline b32
IsNilTokenNode(token_node *TokenNode)
{
return TokenNode == &nil_token_node || TokenNode == NULL;
}
internal inline b32
IsNilToken(token *Token)
{
return Token == &nil_token || Token == NULL;
}
internal inline void
ParseCStyleComment(rune Buffer[])
{
// TODO(nasr): handle c style comments
// couuld be usefull for function information visualiszation
// so think of a way to link themn to functions and variables?
// some sort of meta data per thing?
// and then we can do a visualization if the str8.count of the metadata thing is bigger then 0
// we should a visualization thing for the thing
// if the thing is less then 0, we dont do anything?
// TODO(nasr): while doingn this we could also add in some editor specific anotations ?
}
internal inline void
ParseCPPStyleComment(rune Buffer[])
{
// TODO(nasr):
}
internal inline b32
Is_TokenBreak(rune Character)
{
return (IsWhiteSpace(Character) || IsDelimiter(Character));
}
internal token_list *
Lex(app_text *Text, arena *Arena, token_list *List)
{
b32 Initialized = 0;
s32 Line = 1;
s32 Column = 1;
for(s32 TextIndex = 0; TextIndex < Text->Count; TextIndex++)
{
rune Character = Text->Data[TextIndex];
if(Character == '\r' || Character == '\n')
{
if(Character == '\r' &&
(TextIndex + 1 < Text->Count) &&
Text->Data[TextIndex + 1] == '\n')
{
TextIndex++;
}
++TextIndex;
++Line;
// NOTE(nasr): reset the column to the beginning of the line
Column = 1;
continue;
}
if(IsWhiteSpace(Character))
{
++Column;
continue;
}
token_node *TokenNode = PushStructZero(Arena, token_node);
token *Token = PushStructZero(Arena, token);
TokenNode->Next = &nil_token_node;
TokenNode->Previous = &nil_token_node;
TokenNode->Token = Token;
Token->Line = Line;
Token->Column = Column;
Token->ByteOffset = (u64)TextIndex;
Token->Flags = FlagNone;
s32 TokenStart = TextIndex;
s32 TokenEnd = TextIndex;
if(Character > 126)
{
Token->Type = TokenUnwantedChild;
TokenEnd = TextIndex + 1;
}
else if(IsRuneAlpha(Character))
{
{
while((TextIndex + 1 < Text->Count) &&
(IsRuneAlpha(Text->Data[TextIndex + 1]) || IsRuneDigit(Text->Data[TextIndex + 1])))
{
++TextIndex;
}
TokenEnd = TextIndex + 1;
}
{
// NOTE(luca): This will never work, since the App->Text is a u32 array, should it be str32 instead?
str8 Lexeme = S8FromTo((S8Cast{.Data = (u8 *)Text->Data, .Size = (u64)Text->Count}), (u64)TokenStart, (u64)TokenEnd);
// TODO(nasr): handle functions
if(S8Match(Lexeme, S8("if"), 0))
Token->Type = TokenIf;
else if(S8Match(Lexeme, S8("else"), 0))
Token->Type = TokenElse;
else if(S8Match(Lexeme, S8("return"), 0))
Token->Type = TokenReturn;
else if(S8Match(Lexeme, S8("while"), 0))
Token->Type = TokenWhile;
else if(S8Match(Lexeme, S8("for"), 0))
Token->Type = TokenFor;
else if(S8Match(Lexeme, S8("break"), 0))
Token->Type = TokenBreak;
else if(S8Match(Lexeme, S8("continue"), 0))
Token->Type = TokenContinue;
else
Token->Type = TokenIdentifier;
}
}
else if(IsRuneDigit(Character))
{
while((TextIndex + 1 < Text->Count) &&
IsRuneDigit(Text->Data[TextIndex + 1]))
{
++TextIndex;
}
TokenEnd = TextIndex + 1;
Token->Type = TokenNumber;
}
else
{
rune Next = (TextIndex + 1 < Text->Count) ? Text->Data[TextIndex + 1] : 0;
switch(Character)
{
case '=':
{
if(Next == '=')
{
Token->Type = TokenDoubleEqual;
TextIndex++;
}
else
{
Token->Type = (token_type)'=';
}
}
break;
case '>':
{
if(Next == '=')
{
Token->Type = TokenGreaterEqual;
TextIndex++;
}
else if(Next == '>')
{
Token->Type = TokenRightShift;
TextIndex++;
}
else
{
Token->Type = (token_type)'>';
}
}
break;
case '<':
{
if(Next == '=')
{
Token->Type = TokenLesserEqual;
TextIndex++;
}
else if(Next == '<')
{
Token->Type = TokenLeftShift;
TextIndex++;
}
else
{
Token->Type = (token_type)'<';
}
}
break;
case '"':
{
while(Text->Data[TextIndex + 1] != '"' && Text->Data[TextIndex + 1] != '\0')
{
++TextIndex;
if(Text->Data[TextIndex + 1] == '\\')
++TextIndex;
}
TokenStart += 1;
Token->Type = TokenString;
}
break;
default:
{
Token->Type = (token_type)Character;
}
break;
}
}
TokenEnd = TextIndex + 1;
Token->Lexeme.Data = (u8 *)&Text->Data[TokenStart];
Token->Lexeme.Size = (u64)(TokenEnd - TokenStart);
Column += (s32)Token->Lexeme.Size;
//Log("Token: \t%.lu*s\n", Token->Lexeme.Size, Token->Lexeme.Data);
if(!Initialized)
{
Initialized = 1;
List->Root = TokenNode;
List->Current = TokenNode;
}
else
{
TokenNode->Previous = List->Current;
List->Current->Next = TokenNode;
List->Current = TokenNode;
}
}
return List;
}
NO_WARNINGS_END
|
