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LibGUI: Highlight various number literals

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This commit is contained in:
Oriko 2020-03-11 20:31:25 +02:00 • committed by Andreas Kling
parent 07e5b93c38
commit 8d54e4e012
3 changed files with 76 additions and 5 deletions
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75
Libraries/LibGUI/CppLexer.cpp
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@ -425,12 +425,81 @@ Vector<CppToken> CppLexer::lex()
commit_token(CppToken::Type::SingleQuotedString);
continue;
}
if (isdigit(ch)) {
if (isdigit(ch) || (ch == '.' && isdigit(peek(1)))) {
begin_token();
while (peek() && isdigit(peek())) {
consume();
auto type = ch == '.' ? CppToken::Type::Float : CppToken::Type::Integer;
bool is_hex = false;
bool is_binary = false;
auto match_exponent = [&]() -> size_t {
char ch = peek();
if (ch != 'e' && ch != 'E' && ch != 'p' && ch != 'P')
return 0;
type = CppToken::Type::Float;
size_t length = 1;
ch = peek(length);
if (ch == '+' || ch == '-') {
++length;
}
for (ch = peek(length); isdigit(ch); ch = peek(length)) {
++length;
}
return length;
};
auto match_type_literal = [&]() -> size_t {
size_t length = 0;
for (;;) {
char ch = peek(length);
if ((ch == 'u' || ch == 'U') && type == CppToken::Type::Integer) {
++length;
} else if ((ch == 'f' || ch == 'F') && !is_binary) {
type = CppToken::Type::Float;
++length;
} else if (ch == 'l' || ch == 'L') {
++length;
} else
return length;
}
};
if (peek() == 'b' || peek() == 'B') {
consume();
is_binary = true;
for (char ch = peek(); ch == '0' || ch == '1' || (ch == '\'' && peek(1) != '\''); ch = peek()) {
consume();
}
} else {
if (peek() == 'x' || peek() == 'X') {
consume();
is_hex = true;
}
for (char ch = peek(); (is_hex ? isxdigit(ch) : isdigit(ch)) || (ch == '\'' && peek(1) != '\'') || ch == '.'; ch = peek()) {
if (ch == '.') {
if (type == CppToken::Type::Integer) {
type = CppToken::Type::Float;
} else
break;
};
consume();
}
}
commit_token(CppToken::Type::Number);
if (!is_binary) {
size_t length = match_exponent();
for (size_t i = 0; i < length; ++i)
consume();
}
size_t length = match_type_literal();
for (size_t i = 0; i < length; ++i)
consume();
commit_token(type);
continue;
}
if (is_valid_first_character_of_identifier(ch)) {