private void MapProperty(PropertyInfo property, object astNode, ICstNode newCstNode)
{
/*
* else if (consumeAttribute.Converter != null)
* {
* CoalesceAndConvert(astNode, property, newCstNode, consumeAttribute.Converter, consumeAttribute.ConverterArgs);
* }
*/
// If the property type is simple, we will just convert the text of the CST node into that type.
if (IsSimpleType(property.PropertyType))
{
Coalesce(astNode, property, newCstNode, property.PropertyType);
}
// Lists are a special case to help unravel recursion.
else if (property.PropertyType.IsGenericList())
{
BuildList(property, astNode, (CstNonterminalNode)newCstNode);
}
// Each enum value may contain a ConsumeAttribute indicating how to map it. Otherwise we do
// a simple parse.
else if (property.PropertyType.IsEnum)
{
var enums = property.PropertyType.GetEnums();
string expectedName = newCstNode.Coalesce();
foreach (var @enum in enums)
{
string name = @enum.Name;
ConsumeAttribute[] enumConsumeAttributes = @enum.Field.GetAttributes <ConsumeAttribute>();
if (enumConsumeAttributes.Length > 0)
{
foreach (ConsumeAttribute enumConsume in enumConsumeAttributes)
{
if (enumConsume.Expression == expectedName)
{
name = enumConsume.Expression;
break;
}
}
}
if (name == expectedName)
{
property.SetValue(astNode, @enum.Value, null);
goto foundEnum;
}
}
throw new InvalidOperationException("No enum found for " + expectedName + " in " + property.PropertyType);
foundEnum:
;
}
// Otherwise we create a new AST node and recurse into this method.
else //if (nonterminalTypes.Values.Contains(property.PropertyType))
{
object newAstNode = Build(property.PropertyType, newCstNode);
// Set the property to the new AST node
property.SetValue(astNode, newAstNode, null);
}
}
private void Coalesce(object astNode, PropertyInfo property, ICstNode cstNode, Type targetType)
{
string value = cstNode.Coalesce();
object o;
try
{
o = Convert.ChangeType(value, targetType);
}
catch (Exception e)
{
throw new InvalidOperationException("Error converting '" + value + "' to a " + targetType.FullName + " for property " + property.GetPath(), e);
}
property.SetValue(astNode, o, null);
}
/// <summary>
///
/// </summary>
/// <param name="astNodeType">The type of node we are creating. A subclass might possibly be selected.</param>
/// <param name="cstNode">The CST node that represents the structured input for the specified AST node</param>
/// <returns>The new astNode of the specified astNodeType that consumes the cstNode</returns>
private object Build(Type astNodeType, ICstNode cstNode)
{
int consumeIndex = 0;
if (astNodeType.IsAbstract || astNodeType.IsInterface)
{
string ruleName = ((CstNonterminalNode)cstNode).Nonterminal.Name;
CstNonterminalNode cstNonterminalNode = (CstNonterminalNode)cstNode;
astNodeType = GetSubclass(ref cstNonterminalNode, ruleName);
cstNode = cstNonterminalNode;
}
object astNode;
try
{
if (astNodeType == typeof(string))
{
return(cstNode.Coalesce());
}
else if (astNodeType == typeof(int))
{
return(int.Parse(cstNode.Coalesce()));
}
else if (astNodeType == typeof(byte))
{
return(byte.Parse(cstNode.Coalesce()));
}
else if (astNodeType == typeof(short))
{
return(short.Parse(cstNode.Coalesce()));
}
else if (astNodeType == typeof(long))
{
return(long.Parse(cstNode.Coalesce()));
}
else if (astNodeType == typeof(float))
{
return(float.Parse(cstNode.Coalesce()));
}
else if (astNodeType == typeof(double))
{
return(double.Parse(cstNode.Coalesce()));
}
else if (astNodeType == typeof(decimal))
{
return(decimal.Parse(cstNode.Coalesce()));
}
else if (astNodeType == typeof(bool))
{
return(bool.Parse(cstNode.Coalesce()));
}
else
{
astNode = CreateAstNode(astNodeType);
}
}
catch (Exception e)
{
throw new InvalidOperationException("Error instantiating " + astNodeType.FullName, e);
}
foreach (PropertyInfo property in astNode.GetType().GetAllPropertiesInAncestry())
{
ConsumeAttribute[] consumeAttributes = property.GetAttributes <ConsumeAttribute>();
foreach (ConsumeAttribute consumeAttribute in consumeAttributes)
{
if (consumeIndex > 0 && consumeIndex != consumeAttribute.Production)
{
continue;
}
CstNonterminalNode productionNode = cstNode as CstNonterminalNode;
// 1) Handle the simple case where the NonTerminal exactly matches the NonTerminal property of our consume attribute
// 2) Handle the empty [Consume] case, which means it goes into this block no matter what.
// Get the expression (parsed from the NonTerminal property)
ConsumeExpression expression = consumeAttribute.GetExpression();
// The goal of the expression is to bring us to a new CST node (a descendent of the current one)
ICstNode newCstNode;
try
{
newCstNode = expression != null?expression.Resolve(productionNode).FirstOrDefault() : productionNode;
}
catch (Exception e)
{
throw new InvalidOperationException("Error resolving expression '" + consumeAttribute.Expression + "' for " + property.GetPath(), e);
}
// There are a number of reasons why the new cst node might be null. It is perfectly
// legal to specify nonterminal expressions that only resolve under certain productions.
// In other scenarios, it will remain null.
if (newCstNode != null)
{
// If the Value property is set, then we simply assign the property to that value (since newCstNode is not null)
if (consumeAttribute.Value != null)
{
property.SetValue(astNode, consumeAttribute.Value, null);
}
else if (consumeAttribute.Type != null)
{
Coalesce(astNode, property, newCstNode, consumeAttribute.Type);
}
else
{
MapProperty(property, astNode, newCstNode);
}
goto nextProperty;
}
}
var impliedCstNode = ((CstNonterminalNode)cstNode).Children.OfType <ICstNonterminalNode>().SingleOrDefault(o => o.Nonterminal.Name == property.Name);
if (impliedCstNode != null)
{
MapProperty(property, astNode, impliedCstNode);
}
nextProperty :;
}
return(astNode);
}