private static TResult CompileCommon <TResult>(string commandText,
Perspective perspective,
ParserOptions parserOptions,
Func <AST.Node, ParserOptions, TResult> compilationFunction)
where TResult : class
{
TResult result = null;
//
// Validate arguments
//
EntityUtil.CheckArgumentNull(perspective, "commandText");
EntityUtil.CheckArgumentNull(perspective, "perspective");
//
// Validate parser options - if null, give default options
//
parserOptions = parserOptions ?? new ParserOptions();
//
// Invoke Parser
//
AST.Node astCommand = Parse(commandText, parserOptions);
//
// Perform Semantic Analysis/Conversion
//
result = compilationFunction(astCommand, parserOptions);
return(result);
}
/// <summary>
/// Parse eSQL command string into an AST
/// </summary>
/// <param name="commandText">eSQL command</param>
/// <param name="parserOptions">parser options<seealso cref="ParserOptions"/></param>
/// <returns>Ast</returns>
/// <exception cref="System.Data.EntityException">Thrown when Syntatic or Semantic rules are violated and the query cannot be accepted</exception>
/// <remarks>
/// This method is not thread safe.
/// </remarks>
/// <seealso cref="ParserOptions"/>
private static AST.Node Parse(string commandText, ParserOptions parserOptions)
{
AST.Node astExpr = null;
//
// commandText and parserOptions are validated inside of CqlParser
//
//
// Create Parser
//
CqlParser cqlParser = new CqlParser(parserOptions, true);
//
// Invoke parser
//
astExpr = cqlParser.Parse(commandText);
if (null == astExpr)
{
throw EntityUtil.EntitySqlError(commandText, System.Data.Entity.Strings.InvalidEmptyQuery, 0);
}
return(astExpr);
}
/// <summary>
/// Performs semantic conversion, validation on a command AST and creates a <see cref="DbCommandTree"/>
/// </summary>
/// <param name="astExpr">Abstract Syntax Tree of the command</param>
/// <param name="perspective">perspective</param>
/// <param name="parserOptions">parser options<seealso cref="ParserOptions"/></param>
/// <param name="parameters">ordinary command parameters</param>
/// <returns>a parse result with a valid command tree</returns>
/// <remarks>Parameters name/types must be bound before invoking this method</remarks>
/// <exception cref="System.Data.EntityException">Thrown when Syntatic or Semantic rules are violated and the query cannot be accepted.</exception>
/// <exception cref="System.Data.MetadataException">Thrown as inner exception of a EntityException when metadata related service requests fail.</exception>
/// <exception cref="System.Data.MappingException">Thrown as inner exception of a EntityException when mapping related service requests fail.</exception>
/// <remarks>
/// This method is not thread safe.
/// </remarks>
/// <seealso cref="ParserOptions"/>
/// <seealso cref="DbCommandTree"/>
private static ParseResult AnalyzeCommandSemantics(AST.Node astExpr,
Perspective perspective,
ParserOptions parserOptions,
IEnumerable <DbParameterReferenceExpression> parameters)
{
ParseResult result = AnalyzeSemanticsCommon(astExpr, perspective, parserOptions, parameters, null /*variables*/,
(analyzer, astExpression) =>
{
var parseResultInternal = analyzer.AnalyzeCommand(astExpression);
Debug.Assert(parseResultInternal != null, "parseResultInternal != null post-condition FAILED");
Debug.Assert(parseResultInternal.CommandTree != null, "parseResultInternal.CommandTree != null post-condition FAILED");
return(parseResultInternal);
});
return(result);
}
/// <summary>
/// Performs semantic conversion, validation on a query command AST and creates a <see cref="DbLambda"/>
/// </summary>
/// <param name="astQueryCommand">Abstract Syntax Tree of the query command</param>
/// <param name="perspective">perspective</param>
/// <param name="parserOptions">parser options<seealso cref="ParserOptions"/></param>
/// <param name="parameters">ordinary command parameters</param>
/// <param name="variables">command free variables</param>
/// <remarks>Parameters name/types must be bound before invoking this method</remarks>
/// <exception cref="System.Data.EntityException">Thrown when Syntatic or Semantic rules are violated and the query cannot be accepted.</exception>
/// <exception cref="System.Data.MetadataException">Thrown as inner exception of a EntityException when metadata related service requests fail.</exception>
/// <exception cref="System.Data.MappingException">Thrown as inner exception of a EntityException when mapping related service requests fail.</exception>
/// <remarks>
/// This method is not thread safe.
/// </remarks>
/// <seealso cref="ParserOptions"/>
/// <seealso cref="DbExpression"/>
private static DbLambda AnalyzeQueryExpressionSemantics(AST.Node astQueryCommand,
Perspective perspective,
ParserOptions parserOptions,
IEnumerable <DbParameterReferenceExpression> parameters,
IEnumerable <DbVariableReferenceExpression> variables)
{
return(AnalyzeSemanticsCommon(
astQueryCommand,
perspective,
parserOptions,
parameters,
variables,
(analyzer, astExpr) =>
{
DbLambda lambda = analyzer.AnalyzeQueryCommand(astExpr);
Debug.Assert(null != lambda, "null != lambda post-condition FAILED");
return lambda;
}));
}
private static TResult AnalyzeSemanticsCommon <TResult>(AST.Node astExpr,
Perspective perspective,
ParserOptions parserOptions,
IEnumerable <DbParameterReferenceExpression> parameters,
IEnumerable <DbVariableReferenceExpression> variables,
Func <SemanticAnalyzer, AST.Node, TResult> analysisFunction)
where TResult : class
{
TResult result = null;
try
{
//
// Validate arguments
//
EntityUtil.CheckArgumentNull(astExpr, "astExpr");
EntityUtil.CheckArgumentNull(perspective, "perspective");
//
// Invoke semantic analysis
//
SemanticAnalyzer analyzer = (new SemanticAnalyzer(SemanticResolver.Create(perspective, parserOptions, parameters, variables)));
result = analysisFunction(analyzer, astExpr);
}
//
// Wrap MetadataException as EntityException inner exception
//
catch (System.Data.MetadataException metadataException)
{
throw EntityUtil.EntitySqlError(System.Data.Entity.Strings.GeneralExceptionAsQueryInnerException("Metadata"), metadataException);
}
//
// Wrap MappingException as EntityException inner exception
//
catch (System.Data.MappingException mappingException)
{
throw EntityUtil.EntitySqlError(System.Data.Entity.Strings.GeneralExceptionAsQueryInnerException("Mapping"), mappingException);
}
return(result);
}
internal Token(short tokenId, AST.Node tokenValue)
{
_tokenId = tokenId;
_tokenValue = tokenValue;
}
/// <summary>
/// Creates a new token.
/// </summary>
/// <param name="tokenId">tokenid</param>
/// <param name="tokenvalue">ast node</param>
/// <returns></returns>
static internal Token NewToken(short tokenId, AST.Node tokenvalue)
{
return(new Token(tokenId, tokenvalue));
}
