83 lines
1.7 KiB
C++
83 lines
1.7 KiB
C++
#pragma once
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#include "antlr4-runtime.h"
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#include <QChar>
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/// Helper stream for antlr, the lexer does not need to base case sensitive
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/// this is achieved by changing the case of the chars in LA how ever
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/// when the text of a recognized token is captured the getText function
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/// is used which does no case conversion so the parse will receive the original
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/// case.
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class CaseChangingCharStream: public antlr4::CharStream
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{
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public:
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CaseChangingCharStream(antlr4::CharStream *stream, bool upper)
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: stream(stream)
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, upper(upper)
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{}
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virtual ~CaseChangingCharStream()
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{}
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virtual void consume() override
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{
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stream->consume();
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}
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virtual size_t LA(ssize_t i) override
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{
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int c = stream->LA(i);
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if (c <= 0)
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return c;
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if (upper)
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return QChar::toUpper(c);
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return QChar::toLower(c);
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}
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virtual std::string getText(const antlr4::misc::Interval &interval) override
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{
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return stream->getText(interval);
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}
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virtual std::string toString() const override
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{
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return stream->toString();
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}
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virtual ssize_t mark() override
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{
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return stream->mark();
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}
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virtual void release(ssize_t marker) override
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{
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stream->release(marker);
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}
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virtual size_t index() override
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{
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return stream->index();
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}
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virtual void seek(size_t index) override
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{
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stream->seek(index);
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}
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virtual size_t size() override
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{
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return stream->size();
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}
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virtual std::string getSourceName() const override
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{
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return stream->getSourceName();
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}
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private:
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antlr4::CharStream *stream;
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bool upper;
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};
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