C++ (Cpp) BFFIterator::IsAtValidFunctionNameCharacter示例

示例#1

文件： BFFParser.cpp 项目： ClxS/fastbuild

// Parse
//------------------------------------------------------------------------------
bool BFFParser::Parse( BFFIterator & iter )
{
	for (;;)
	{
		iter.SkipWhiteSpace();

		// is this a comment?
		if ( iter.IsAtComment() )
		{
			iter.SkipComment();
			continue;
		}

		const char c = *iter;
		switch ( c )
		{
			case BFF_DECLARE_VAR_INTERNAL:
			case BFF_DECLARE_VAR_PARENT:
			{
				if ( ParseNamedVariableDeclaration( iter ) == false )
				{
					return false;
				}
				continue;
			}
			case BFF_VARIABLE_CONCATENATION:
			case BFF_VARIABLE_SUBTRACTION:
			{
				// concatenation to last used variable
				if ( ParseUnnamedVariableModification( iter ) == false )
				{
					return false;
				}
				continue;
			}
			case BFF_SCOPE_OPEN:
			{
				// start an unnamed scope
				if ( ParseUnnamedScope( iter ) == false )
				{
					return false;
				}
				continue;
			}
			case BFF_PREPROCESSOR_START:
			{
				if ( ParsePreprocessorDirective( iter ) == false )
				{
					return false;
				}
				continue;
			}
			default:
			{
				if ( iter.IsAtValidFunctionNameCharacter() )
				{
					if ( ParseFunction( iter ) == false )
					{
						return false;
					}
					continue;
				}
			}
		}

		iter.SkipWhiteSpace();
		if ( iter.IsAtEnd() == false )
		{
			Error::Error_1010_UnknownConstruct( iter );
			return false;
		}

		break;  // cleanly hit end of file
	}

	return true;
}

示例#2

文件： BFFParser.cpp 项目： ClxS/fastbuild

// ParseFunction
//------------------------------------------------------------------------------
bool BFFParser::ParseFunction( BFFIterator & iter )
{
	ASSERT( iter.IsAtValidFunctionNameCharacter() );

	// for variables to be used by this function
	BFFStackFrame stackFrame;

	BFFIterator functionNameStart( iter );
	iter.SkipFunctionName();
	if ( iter.IsAtEnd() )
	{
		Error::Error_1012_UnexpectedEndOfFile( iter );
		return false;
	}

	// check length
	if ( functionNameStart.GetDistTo( iter ) > MAX_FUNCTION_NAME_LENGTH )
	{
		// if it's too long, then it can't be a valid function
		Error::Error_1015_UnknownFunction( functionNameStart );
		return false;
	}

	// store function name
	AStackString<MAX_FUNCTION_NAME_LENGTH> functionName( functionNameStart.GetCurrent(), iter.GetCurrent() );
	const Function * func = Function::Find( functionName );
	if ( func == nullptr )
	{
		Error::Error_1015_UnknownFunction( functionNameStart );
		return false;
	}
	iter.SkipWhiteSpace();

	if ( func->IsUnique() && func->GetSeen() )
	{
		Error::Error_1020_FunctionCanOnlyBeInvokedOnce( functionNameStart, func );
		return false;
	}
	func->SetSeen();

	FLOG_INFO( "Function call '%s'", functionName.Get() );

	// header, or body?
	bool hasHeader = false;
	BFFIterator functionArgsStartToken( iter );
	BFFIterator functionArgsStopToken( iter );
	if ( *iter == BFF_FUNCTION_ARGS_OPEN )
	{
		// can this function accept a header?
		if ( func->AcceptsHeader() == false )
		{
			Error::Error_1021_UnexpectedHeaderForFunction( iter, func );
			return false;
		}

		// args
		if ( iter.ParseToMatchingBrace( BFF_FUNCTION_ARGS_OPEN, BFF_FUNCTION_ARGS_CLOSE ) == false )
		{
			Error::Error_1022_MissingFunctionHeaderCloseToken( functionArgsStartToken, func );
			return false;
		}
		functionArgsStopToken = iter;
		hasHeader = true;
		iter++; // skip over closing token	
		iter.SkipWhiteSpaceAndComments();
	}

	if ( func->NeedsHeader() && ( hasHeader == false ) )
	{
		Error::Error_1023_FunctionRequiresAHeader( iter, func );
		return false;
	}

	// some functions have no body
	bool hasBody = false;

	BFFIterator functionBodyStartToken( iter );
	BFFIterator functionBodyStopToken( iter );
	if ( func->NeedsBody() )
	{
		// find body
		if ( *iter != BFF_SCOPE_OPEN )
		{
			Error::Error_1024_FunctionRequiresABody( functionNameStart, func );
			return false;
		}

		if ( iter.ParseToMatchingBrace( BFF_SCOPE_OPEN, BFF_SCOPE_CLOSE ) == false )
		{
			Error::Error_1025_MissingScopeCloseToken( functionBodyStartToken, func );
			return false;
		}

		functionBodyStopToken = iter;
		iter++;
		hasBody = true;
	}

	return func->ParseFunction( functionNameStart,
								hasBody ? &functionBodyStartToken : nullptr, 
								hasBody ? &functionBodyStopToken : nullptr,
								hasHeader ? &functionArgsStartToken : nullptr,
								hasHeader ? &functionArgsStopToken : nullptr );}