scanner.h 1.6 KB
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#pragma once

#include <ios>
#include <string>
#include <queue>
#include <stack>
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#include <set>
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namespace YAML
{
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	struct Token;
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	class Scanner
	{
	public:
		Scanner(std::istream& in);
		~Scanner();

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		Token *GetNextToken();

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		void ScanNextToken();
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		void ScanToNextToken();
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		Token *PushIndentTo(int column, bool sequence);
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		void PopIndentTo(int column);
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		void InsertSimpleKey();
		bool ValidateSimpleKey();
		void ValidateAllSimpleKeys();

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		void Scan();

	private:
		char GetChar();
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		std::string GetChar(int n);
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		void Eat(int n = 1);
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		void EatLineBreak();

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		bool IsWhitespaceToBeEaten(char ch);
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		bool IsDocumentStart();
		bool IsDocumentEnd();
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		bool IsBlockEntry();
		bool IsKey();
		bool IsValue();
		bool IsPlainScalar();

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		void GetBlockIndentation(int& indent, std::string& breaks);

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		struct SimpleKey {
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			SimpleKey(int pos_, int line_, int column_, int flowLevel_);
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			void Validate();
			void Invalidate();

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			int pos, line, column, flowLevel;
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			bool required;
			Token *pMapStart, *pKey;
		};

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		template <typename T> void ScanAndEnqueue(T *pToken);
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		template <typename T> T *ScanToken(T *pToken);

	private:
		// the stream
		std::istream& INPUT;
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		int m_line, m_column;
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		// the output (tokens)
		std::queue <Token *> m_tokens;
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		std::set <Token *> m_limboTokens;
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		// state info
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		bool m_startedStream, m_endedStream;
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		bool m_simpleKeyAllowed;
		int m_flowLevel;                // number of unclosed '[' and '{' indicators
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		bool m_isLastKeyValid;
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		std::stack <SimpleKey> m_simpleKeys;
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		std::stack <int> m_indents;
	};
}