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CppLexer: Support raw string literals

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Handles prefixes and delimiters (`R"(text)", `u8R"f(text)f"`, ...).
This commit is contained in:
Nico Weber 2020-07-26 20:49:17 -04:00 • committed by Andreas Kling
parent 4d783338c1
commit 9ee1edae2a
3 changed files with 24 additions and 0 deletions
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22
Libraries/LibGUI/CppLexer.cpp
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@ -636,6 +636,28 @@ Vector<CppToken> CppLexer::lex()
commit_token(CppToken::Type::DoubleQuotedString);
continue;
}
if (size_t prefix = match_string_prefix('R'); prefix > 0 && peek(prefix) == '"') {
begin_token();
for (size_t i = 0; i < prefix + 1; ++i)
consume();
size_t prefix_start = m_index;
while (peek() && peek() != '(')
consume();
StringView prefix_string = m_input.substring_view(prefix_start, m_index - prefix_start);
while (peek()) {
if (consume() == '"') {
ASSERT(m_index >= prefix_string.length() + 2);
ASSERT(m_input[m_index - 1] == '"');
if (m_input[m_index - 1 - prefix_string.length() - 1] == ')') {
StringView suffix_string = m_input.substring_view(m_index - 1 - prefix_string.length(), prefix_string.length());
if (prefix_string == suffix_string)
break;
}
}
}
commit_token(CppToken::Type::DoubleQuotedString);
continue;
}
if (size_t prefix = match_string_prefix('\''); prefix > 0) {
begin_token();
for (size_t i = 0; i < prefix; ++i)