/// <summary>
/// A copy constructor that allocates an instance that is the same as the given template, except for its containing block.
/// </summary>
/// <param name="containingBlock">The containing block of the copied type invariant. This should be different from the containing block of the template.</param>
/// <param name="template">The statement to copy.</param>
protected TypeInvariant(BlockStatement containingBlock, TypeInvariant template)
: base(containingBlock, template)
{
if (template.Name != null)
this.name = template.Name.MakeCopyFor(containingBlock.Compilation);
this.isAxiom = template.isAxiom;
}
/// <summary>
/// Visits the specified type invariant.
/// </summary>
/// <param name="typeInvariant">The type invariant.</param>
protected virtual ITypeInvariant DeepCopy(TypeInvariant typeInvariant)
{
typeInvariant.Condition = this.Substitute(typeInvariant.Condition);
if (typeInvariant.Description != null)
typeInvariant.Description = this.Substitute(typeInvariant.Description);
return typeInvariant;
}
/// <summary>
/// Get the mutable copy of a type invariant.
/// </summary>
/// <param name="typeInvariant"></param>
/// <returns></returns>
public virtual TypeInvariant GetMutableCopy(ITypeInvariant typeInvariant)
{
object cachedValue;
if (this.cache.TryGetValue(typeInvariant, out cachedValue))
return (TypeInvariant)cachedValue;
var result = new TypeInvariant(typeInvariant);
// Probably not necessary, no two thrown exceptions are shared.
this.cache.Add(typeInvariant, result);
this.cache.Add(result, result);
return result;
}
/// <summary>
/// Rewrites the children of the given type invariant.
/// </summary>
public virtual void RewriteChildren(TypeInvariant typeInvariant)
{
this.RewriteChildren((ContractElement)typeInvariant);
}
/// <summary>
/// Visits the specified type invariant.
/// </summary>
/// <param name="typeInvariant">The type invariant.</param>
public virtual ITypeInvariant Visit(TypeInvariant typeInvariant)
{
typeInvariant.Condition = this.Visit(typeInvariant.Condition);
if (typeInvariant.Description != null)
typeInvariant.Description = this.Visit(typeInvariant.Description);
return typeInvariant;
}
/// <summary>
/// Visits the specified type invariant.
/// </summary>
/// <param name="typeInvariant">The type invariant.</param>
public virtual ITypeInvariant Visit(ITypeInvariant typeInvariant)
{
TypeInvariant mutableTypeInvariant = typeInvariant as TypeInvariant;
if (!this.copyOnlyIfNotAlreadyMutable || mutableTypeInvariant == null)
mutableTypeInvariant = new TypeInvariant(typeInvariant);
return this.Visit(mutableTypeInvariant);
}
