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LibGUI: Syntax highlight string escape sequences

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This commit is contained in:
Oriko 2020-03-10 22:26:11 +02:00 • committed by Andreas Kling
parent bc10e0eeb2
commit d58cf1a05d
3 changed files with 84 additions and 0 deletions
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81
Libraries/LibGUI/CppLexer.cpp
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@ -243,6 +243,61 @@ Vector<CppToken> CppLexer::lex()
tokens.append(token);
};
auto match_escape_sequence = [&]() -> size_t {
switch (peek(1)) {
case '\'':
case '"':
case '?':
case '\\':
case 'a':
case 'b':
case 'f':
case 'n':
case 'r':
case 't':
case 'v':
return 2;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7': {
size_t octal_digits = 1;
for (size_t i = 0; i < 2; ++i) {
char next = peek(2 + i);
if (next < '0' || next > '7')
break;
++octal_digits;
}
return 1 + octal_digits;
}
case 'x': {
size_t hex_digits = 0;
for (size_t i = 0; i < 2; ++i) {
if (!isxdigit(peek(2 + i)))
break;
++hex_digits;
}
return 2 + hex_digits;
}
case 'u': {
bool is_unicode = true;
for (size_t i = 0; i < 4; ++i) {
if (!isxdigit(peek(2 + i))) {
is_unicode = false;
break;
}
}
return is_unicode ? 6 : 0;
}
default:
return 0;
}
};
while (m_index < m_input.length()) {
auto ch = peek();
if (isspace(ch)) {
@ -328,6 +383,19 @@ Vector<CppToken> CppLexer::lex()
begin_token();
consume();
while (peek()) {
if (peek() == '\\') {
size_t escape = match_escape_sequence();
if (escape > 0) {
commit_token(CppToken::Type::DoubleQuotedString);
begin_token();
for (size_t i = 0; i < escape; ++i)
consume();
commit_token(CppToken::Type::EscapeSequence);
begin_token();
continue;
}
}
if (consume() == '"')
break;
}
@ -338,6 +406,19 @@ Vector<CppToken> CppLexer::lex()
begin_token();
consume();
while (peek()) {
if (peek() == '\\') {
size_t escape = match_escape_sequence();
if (escape > 0) {
commit_token(CppToken::Type::SingleQuotedString);
begin_token();
for (size_t i = 0; i < escape; ++i)
consume();
commit_token(CppToken::Type::EscapeSequence);
begin_token();
continue;
}
}
if (consume() == '\'')
break;
}