LibRegex: Remove Lexer::slice_back() and just use StringViews

2 files changed, 4 insertions, 4 deletions

diff --git a/Libraries/LibRegex/RegexLexer.h b/Libraries/LibRegex/RegexLexer.h
index 7a54dea091..959fa50c33 100644
--- a/Libraries/LibRegex/RegexLexer.h
+++ b/Libraries/LibRegex/RegexLexer.h
@@ -94,8 +94,6 @@ public:
     bool try_skip(char);
     char skip();
 
-    StringView slice_back(size_t offset) const { return m_source.substring_view(m_position - offset - 1, offset); }
-
 private:
     ALWAYS_INLINE char peek(size_t offset = 0) const;
     ALWAYS_INLINE void consume();
diff --git a/Libraries/LibRegex/RegexParser.cpp b/Libraries/LibRegex/RegexParser.cpp
index aa22be74b2..ca86012f53 100644
--- a/Libraries/LibRegex/RegexParser.cpp
+++ b/Libraries/LibRegex/RegexParser.cpp
@@ -803,6 +803,7 @@ Optional<unsigned> ECMA262Parser::read_digits(ECMA262Parser::ReadDigitsInitialZe
 
     int count = 0;
     size_t offset = 0;
+    auto start_token = m_parser_state.current_token;
     while (match(TokenType::Char)) {
         auto c = m_parser_state.current_token.value();
         if (follow_policy == ReadDigitFollowPolicy::DisallowDigit) {
@@ -826,7 +827,7 @@ Optional<unsigned> ECMA262Parser::read_digits(ECMA262Parser::ReadDigitsInitialZe
         ++count;
     }
 
-    auto str = m_parser_state.lexer.slice_back(offset);
+    StringView str { start_token.value().characters_without_null_termination(), offset };
     if (hex)
         return AK::StringUtils::convert_to_uint_from_hex(str);
 
@@ -1371,6 +1372,7 @@ StringView ECMA262Parser::read_capture_group_specifier(bool take_starting_angle_
     if (take_starting_angle_bracket && !consume("<"))
         return {};
 
+    auto start_token = m_parser_state.current_token;
     size_t offset = 0;
     while (match(TokenType::Char)) {
         auto c = m_parser_state.current_token.value();
@@ -1379,7 +1381,7 @@ StringView ECMA262Parser::read_capture_group_specifier(bool take_starting_angle_
         offset += consume().value().length();
     }
 
-    auto name = m_parser_state.lexer.slice_back(offset);
+    StringView name { start_token.value().characters_without_null_termination(), offset };
     if (!consume(">") || name.is_empty())
         set_error(Error::InvalidNameForCaptureGroup);