solidity/libsolidity/parsing/Token.cpp

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#include <map>
#include <libsolidity/parsing/Token.h>
#include <boost/range/iterator_range.hpp>

using namespace std;

namespace dev
{
namespace solidity
{

void ElementaryTypeNameToken::assertDetails(Token::Value _baseType, unsigned const& _first, unsigned const& _second)
{
	solAssert(Token::isElementaryTypeName(_baseType), "");
	if (_baseType == Token::BytesM)
	{
		solAssert(_second == 0, "There should not be a second size argument to type bytesM.");
		solAssert(_first <= 32, "No elementary type bytes" + to_string(_first) + ".");
	}
	else if (_baseType == Token::UIntM || _baseType == Token::IntM)
	{
		solAssert(_second == 0, "There should not be a second size argument to type " + string(Token::toString(_baseType)) + ".");
		solAssert(
			_first <= 256 && _first % 8 == 0, 
			"No elementary type " + string(Token::toString(_baseType)) + to_string(_first) + "."
		);
	}
	else if (_baseType == Token::UFixedMxN || _baseType == Token::FixedMxN)
	{
		solAssert(
			_first + _second <= 256 && _first % 8 == 0 && _second % 8 == 0,
			"No elementary type " + string(Token::toString(_baseType)) + to_string(_first) + "x" + to_string(_second) + "."
		);
	}
	m_token = _baseType;
	m_firstNumber = _first;
	m_secondNumber = _second;
}

#define T(name, string, precedence) #name,
char const* const Token::m_name[NUM_TOKENS] =
{
	TOKEN_LIST(T, T)
};
#undef T


#define T(name, string, precedence) string,
char const* const Token::m_string[NUM_TOKENS] =
{
	TOKEN_LIST(T, T)
};
#undef T


#define T(name, string, precedence) precedence,
int8_t const Token::m_precedence[NUM_TOKENS] =
{
	TOKEN_LIST(T, T)
};
#undef T


#define KT(a, b, c) 'T',
#define KK(a, b, c) 'K',
char const Token::m_tokenType[] =
{
	TOKEN_LIST(KT, KK)
};
int Token::parseSize(string::const_iterator _begin, string::const_iterator _end)
{
	try
	{
		unsigned int m = boost::lexical_cast<int>(boost::make_iterator_range(_begin, _end));
		return m;
	}
	catch(boost::bad_lexical_cast const&)
	{
		return -1;
	}
}
tuple<Token::Value, unsigned int, unsigned int> Token::fromIdentifierOrKeyword(string const& _literal)
{
	auto positionM = find_if(_literal.begin(), _literal.end(), ::isdigit);
	if (positionM != _literal.end())
	{
		string baseType(_literal.begin(), positionM);
		auto positionX = find_if_not(positionM, _literal.end(), ::isdigit);
		int m = parseSize(positionM, positionX);
		Token::Value keyword = keywordByName(baseType);
		if (keyword == Token::Bytes)
		{
			if (0 < m && m <= 32 && positionX == _literal.end())
				return make_tuple(Token::BytesM, m, 0);
		}
		else if (keyword == Token::UInt || keyword == Token::Int)
		{
			if (0 < m && m <= 256 && m % 8 == 0 && positionX == _literal.end())
			{
				if (keyword == Token::UInt)
					return make_tuple(Token::UIntM, m, 0);
				else
					return make_tuple(Token::IntM, m, 0);
			}
		}
		else if (keyword == Token::UFixed || keyword == Token::Fixed)
		{
			if (
				positionM < positionX &&
				positionX < _literal.end() &&
				*positionX == 'x' &&
				all_of(positionX + 1, _literal.end(), ::isdigit)
			) {
				int n = parseSize(positionX + 1, _literal.end());
				if (
					0 < m && m < 256 &&
					0 < n && n < 256 &&
					m + n <= 256 &&
					m % 8 == 0 &&
					n % 8 == 0
				) {
					if (keyword == Token::UFixed)
						return make_tuple(Token::UFixed, m, n);
					else
						return make_tuple(Token::Fixed, m, n);
				}
			}	
		}
		return make_tuple(Token::Identifier, 0, 0);
	}
	return make_tuple(keywordByName(_literal), 0, 0);
}
Token::Value Token::keywordByName(string const& _name)
{
	// The following macros are used inside TOKEN_LIST and cause non-keyword tokens to be ignored
	// and keywords to be put inside the keywords variable.
#define KEYWORD(name, string, precedence) {string, Token::name},
#define TOKEN(name, string, precedence)
	static const map<string, Token::Value> keywords({TOKEN_LIST(TOKEN, KEYWORD)});
#undef KEYWORD
#undef TOKEN
	auto it = keywords.find(_name);
	return it == keywords.end() ? Token::Identifier : it->second;
}

#undef KT
#undef KK
}
}