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().UnmaskTypeName());
}
}
// 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.ToLower();
var cols = ASTUtil.GetIdentList(qualCtx.columnList());
var qualNameLower = qualName.ToLower();
switch (qualNameLower)
{
case "inherits":
inherited.AddAll(cols);
continue;
case "starttimestamp":
startTimestamp = cols[0];
continue;
case "endtimestamp":
endTimestamp = cols[0];
continue;
case "copyfrom":
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));
}
internal static IList <string> GetLambdaGoesParams(EsperEPL2GrammarParser.ExpressionLambdaDeclContext ctx)
{
IList <string> parameters;
if (ctx.i != null)
{
parameters = new List <string>(1);
parameters.Add(ctx.i.Text);
}
else
{
parameters = ASTUtil.GetIdentList(ctx.columnList());
}
return(parameters);
}
public static Pair <ExpressionDeclItem, ExpressionScriptProvided> 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.ToLower().Trim() != "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 exprNode = ASTExprHelper.ExprCollectSubNodes(ctx, 0, astExprNodeMap)[0];
var alias = ctx.name.Text;
var decl = new ExpressionDeclItem(alias, Collections.GetEmptyList <String>(), exprNode, true);
return(new Pair <ExpressionDeclItem, ExpressionScriptProvided>(decl, null));
}
if (ctx.expressionDef().stringconstant() != null)
{
var expressionText = scriptBodies[0];
scriptBodies.RemoveAt(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 script = new ExpressionScriptProvided(
name, expressionText, parameters,
optionalReturnType, optionalReturnTypeArray, optionalDialect);
return(new Pair <ExpressionDeclItem, ExpressionScriptProvided>(null, script));
}
var ctxexpr = ctx.expressionDef();
var inner = ASTExprHelper.ExprCollectSubNodes(ctxexpr.expression(), 0, astExprNodeMap)[0];
var parametersNames = Collections.GetEmptyList <string>();
var lambdactx = ctxexpr.expressionLambdaDecl();
if (ctxexpr.expressionLambdaDecl() != null)
{
parametersNames = ASTLibFunctionHelper.GetLambdaGoesParams(lambdactx);
}
var expr = new ExpressionDeclItem(name, parametersNames, inner, false);
return(new Pair <ExpressionDeclItem, ExpressionScriptProvided>(expr, null));
}
