LibCpp: Allow whitespace between # and preprocessor directive

For example, '#    include <stdio.h>' is now supported by the Lexer.

1 files changed, 5 insertions, 2 deletions

diff --git a/Userland/Libraries/LibCpp/Lexer.cpp b/Userland/Libraries/LibCpp/Lexer.cpp
index 2edb5b4863..ea8367d0dc 100644
--- a/Userland/Libraries/LibCpp/Lexer.cpp
+++ b/Userland/Libraries/LibCpp/Lexer.cpp
@@ -528,13 +528,16 @@ Vector<Token> Lexer::lex()
         if (ch == '#') {
             begin_token();
             consume();
+            while (AK::is_ascii_space(peek()))
+                consume();
 
+            size_t directive_start = m_index;
             if (is_valid_first_character_of_identifier(peek()))
                 while (peek() && is_valid_nonfirst_character_of_identifier(peek()))
                     consume();
 
-            auto directive = StringView(m_input.characters_without_null_termination() + token_start_index, m_index - token_start_index);
-            if (directive == "#include") {
+            auto directive = StringView(m_input.characters_without_null_termination() + directive_start, m_index - directive_start);
+            if (directive == "include"sv) {
                 commit_token(Token::Type::IncludeStatement);
 
                 if (is_ascii_space(peek())) {