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AK: Add GenericLexer::retreat()
This allows going back one character at a time, and then re-consume previously consumed chars. The code I need this for looks something like this: ASSERT(lexer.consume_specific('\\')); if (lexer.next_is("foo")) ... lexer.retreat(); lexer.consume_escaped_character(); // This expects lexer.peek() == '\\'
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@ -76,6 +76,13 @@ bool GenericLexer::next_is(const char* expected) const
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return true;
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}
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// Go back to the previous character
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void GenericLexer::retreat()
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{
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ASSERT(m_index > 0);
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m_index--;
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}
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// Consume a character and advance the parser index
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char GenericLexer::consume()
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{
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@ -48,6 +48,8 @@ public:
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bool next_is(StringView) const;
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bool next_is(const char*) const;
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void retreat();
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char consume();
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bool consume_specific(char);
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bool consume_specific(StringView);
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