70 lines
2.2 KiB
C++
70 lines
2.2 KiB
C++
/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
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* Use of this file is governed by the BSD 3-clause license that
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* can be found in the LICENSE.txt file in the project root.
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*/
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#pragma once
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#include "CharStream.h"
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namespace antlr4 {
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// Vacuum all input from a stream and then treat it
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// like a string. Can also pass in a string or char[] to use.
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// Input is expected to be encoded in UTF-8 and converted to UTF-32 internally.
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class ANTLR4CPP_PUBLIC ANTLRInputStream : public CharStream {
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protected:
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/// The data being scanned.
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// UTF-32
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UTF32String _data;
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/// 0..n-1 index into string of next char </summary>
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size_t p;
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public:
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/// What is name or source of this char stream?
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std::string name;
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ANTLRInputStream(const std::string &input = "");
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ANTLRInputStream(const char data_[], size_t numberOfActualCharsInArray);
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ANTLRInputStream(std::istream &stream);
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virtual void load(const std::string &input);
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virtual void load(std::istream &stream);
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/// Reset the stream so that it's in the same state it was
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/// when the object was created *except* the data array is not
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/// touched.
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virtual void reset();
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virtual void consume() override;
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virtual size_t LA(ssize_t i) override;
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virtual size_t LT(ssize_t i);
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/// <summary>
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/// Return the current input symbol index 0..n where n indicates the
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/// last symbol has been read. The index is the index of char to
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/// be returned from LA(1).
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/// </summary>
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virtual size_t index() override;
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virtual size_t size() override;
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/// <summary>
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/// mark/release do nothing; we have entire buffer </summary>
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virtual ssize_t mark() override;
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virtual void release(ssize_t marker) override;
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/// <summary>
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/// consume() ahead until p==index; can't just set p=index as we must
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/// update line and charPositionInLine. If we seek backwards, just set p
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/// </summary>
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virtual void seek(size_t index) override;
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virtual std::string getText(const misc::Interval &interval) override;
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virtual std::string getSourceName() const override;
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virtual std::string toString() const override;
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private:
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void InitializeInstanceFields();
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};
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} // namespace antlr4
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