public static IList <string> GetLambdaGoesParams(EsperEPL2GrammarParser.ExpressionLambdaDeclContext ctx)
{
IList <string> parameters;
if (ctx.i != null)
{
parameters = new List <string>(1);
parameters.Add(ctx.i.GetText());
}
else
{
parameters = ASTUtil.GetIdentList(ctx.columnListKeywordAllowed());
}
return(parameters);
}
public static MyPair WalkExpressionDecl(
EsperEPL2GrammarParser.ExpressionDeclContext ctx,
IList<string> scriptBodies,
IDictionary<ITree, ExprNode> astExprNodeMap,
CommonTokenStream tokenStream)
{
var name = ctx.name.Text;
if (ctx.alias != null)
{
if (!ctx.alias.Text.ToLowerInvariant().Trim().Equals("alias"))
{
throw ASTWalkException.From(
"For expression alias '" + name + "' expecting 'alias' keyword but received '" + ctx.alias.Text + "'");
}
if (ctx.columnList() != null)
{
throw ASTWalkException.From(
"For expression alias '" + name + "' expecting no parameters but received '" + tokenStream.GetText(ctx.columnList()) + "'");
}
if (ctx.expressionDef() != null && ctx.expressionDef().expressionLambdaDecl() != null)
{
throw ASTWalkException.From(
"For expression alias '" + name + "' expecting an expression without parameters but received '" +
tokenStream.GetText(ctx.expressionDef().expressionLambdaDecl()) + "'");
}
if (ctx.expressionDef().stringconstant() != null)
{
throw ASTWalkException.From("For expression alias '" + name + "' expecting an expression but received a script");
}
var node = ASTExprHelper.ExprCollectSubNodes(ctx, 0, astExprNodeMap)[0];
var alias = ctx.name.Text;
var expressionUnmap = StatementSpecMapper.Unmap(node);
var decl = new ExpressionDeclItem(alias, new string[0], true);
decl.OptionalSoda = expressionUnmap;
return new MyPair(decl, null);
}
if (ctx.expressionDef().stringconstant() != null)
{
var expressionText = scriptBodies.DeleteAt(0);
var parameters = ASTUtil.GetIdentList(ctx.columnList());
var optionalReturnType = ctx.classIdentifier() == null ? null : ASTUtil.UnescapeClassIdent(ctx.classIdentifier());
var optionalReturnTypeArray = ctx.array != null;
var optionalDialect = ctx.expressionDialect() == null ? null : ctx.expressionDialect().d.Text;
var optionalEventTypeName = ASTTypeExpressionAnnoHelper.ExpectMayTypeAnno(ctx.typeExpressionAnnotation(), tokenStream);
var script = new ExpressionScriptProvided(
name, expressionText, parameters.ToArray(),
optionalReturnType, optionalReturnTypeArray, optionalEventTypeName, optionalDialect);
return new MyPair(null, script);
}
var ctxexpr = ctx.expressionDef();
var inner = ASTExprHelper.ExprCollectSubNodes(ctxexpr.expression(), 0, astExprNodeMap)[0];
IList<string> parametersNames = new EmptyList<string>();
var lambdactx = ctxexpr.expressionLambdaDecl();
if (ctxexpr.expressionLambdaDecl() != null)
{
parametersNames = ASTLambdaHelper.GetLambdaGoesParams(lambdactx);
}
var expression = StatementSpecMapper.Unmap(inner);
var expr = new ExpressionDeclItem(name, parametersNames.ToArray(), false);
expr.OptionalSoda = expression;
return new MyPair(expr, null);
}
private static CreateSchemaDesc GetSchemaDesc(
EsperEPL2GrammarParser.CreateSchemaDefContext ctx,
AssignedType assignedType)
{
var schemaName = ctx.name.Text;
var columnTypes = GetColTypeList(ctx.createColumnList());
// get model-after types (could be multiple for variants)
ISet<string> typeNames = new LinkedHashSet<string>();
if (ctx.variantList() != null)
{
IList<EsperEPL2GrammarParser.VariantListElementContext> variantCtxs = ctx.variantList().variantListElement();
foreach (var variantCtx in variantCtxs)
{
typeNames.Add(variantCtx.GetText());
}
}
// get inherited and start timestamp and end timestamps
string startTimestamp = null;
string endTimestamp = null;
ISet<string> inherited = new LinkedHashSet<string>();
ISet<string> copyFrom = new LinkedHashSet<string>();
if (ctx.createSchemaQual() != null)
{
IList<EsperEPL2GrammarParser.CreateSchemaQualContext> qualCtxs = ctx.createSchemaQual();
foreach (var qualCtx in qualCtxs)
{
var qualName = qualCtx.i.Text.ToLowerInvariant();
var cols = ASTUtil.GetIdentList(qualCtx.columnList());
if (string.Equals(qualName, "inherits", StringComparison.InvariantCultureIgnoreCase))
{
inherited.AddAll(cols);
continue;
}
if (string.Equals(qualName, "starttimestamp", StringComparison.InvariantCultureIgnoreCase))
{
startTimestamp = cols[0];
continue;
}
if (string.Equals(qualName, "endtimestamp", StringComparison.InvariantCultureIgnoreCase))
{
endTimestamp = cols[0];
continue;
}
if (string.Equals(qualName, "copyfrom", StringComparison.InvariantCultureIgnoreCase))
{
copyFrom.AddAll(cols);
continue;
}
throw new EPException(
"Expected 'inherits', 'starttimestamp', 'endtimestamp' or 'copyfrom' keyword after create-schema clause but encountered '" +
qualName + "'");
}
}
return new CreateSchemaDesc(schemaName, typeNames, columnTypes, inherited, assignedType, startTimestamp, endTimestamp, copyFrom);
}