/// <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 precondition. This should be different from the containing block of the template precondition.</param>
/// <param name="template">The statement to copy.</param>
private LoopInvariant(BlockStatement containingBlock, LoopInvariant template)
: base(containingBlock, template)
{
}
/// <summary>
/// Visits the specified loop invariant.
/// </summary>
/// <param name="loopInvariant">The loop invariant.</param>
/// <returns></returns>
protected virtual ILoopInvariant DeepCopy(LoopInvariant loopInvariant)
{
loopInvariant.Condition = this.Substitute(loopInvariant.Condition);
if (loopInvariant.Description != null)
loopInvariant.Description = this.Substitute(loopInvariant.Description);
return loopInvariant;
}
/// <summary>
/// Get the mutable copy of a loop invariant.
/// </summary>
/// <param name="loopInvariant"></param>
/// <returns></returns>
public virtual LoopInvariant GetMutableCopy(ILoopInvariant loopInvariant)
{
object cachedValue;
if (this.cache.TryGetValue(loopInvariant, out cachedValue))
return (LoopInvariant)cachedValue;
var result = new LoopInvariant(loopInvariant);
// Probably not necessary, no two loop invariants are shared.
this.cache.Add(loopInvariant, result);
this.cache.Add(result, result);
return result;
}
/// <summary>
/// Rewrites the children of the given loop invariant.
/// </summary>
public virtual void RewriteChildren(LoopInvariant loopInvariant)
{
this.RewriteChildren((ContractElement)loopInvariant);
}
/// <summary>
/// Visits the specified loop invariant.
/// </summary>
/// <param name="loopInvariant">The loop invariant.</param>
/// <returns></returns>
public virtual ILoopInvariant Visit(LoopInvariant loopInvariant)
{
loopInvariant.Condition = this.Visit(loopInvariant.Condition);
if (loopInvariant.Description != null)
loopInvariant.Description = this.Visit(loopInvariant.Description);
return loopInvariant;
}
/// <summary>
/// Visits the specified loop invariant.
/// </summary>
/// <param name="loopInvariant">The loop invariant.</param>
/// <returns></returns>
public virtual ILoopInvariant Visit(ILoopInvariant loopInvariant)
{
LoopInvariant mutableLoopInvariant = loopInvariant as LoopInvariant;
if (!this.copyOnlyIfNotAlreadyMutable || mutableLoopInvariant == null)
mutableLoopInvariant = new LoopInvariant(loopInvariant);
return this.Visit(mutableLoopInvariant);
}
