AST

All Implemented Interfaces:

it.unibo.alchemist.model.sapere.dsl.ITree , java.io.Serializable
```
public final class AST
 implements ITree
                    
```

Nested Class Summary

Nested Classes
Modifier and Type	Class	Description

Field Summary

Fields
Modifier and Type	Field	Description

Constructor Summary

Constructors
Constructor	Description
`AST(ITreeNode<out Object> root)`	Builds a new AST given its root node.

Enum Constant Summary

Enum Constants
Enum Constant	Description

Method Summary

Modifier and Type	Method	Description
`AST`	`assignVarValue(Map<HashString, ITreeNode<out Object>> matches)`	This method substitutes variables present in matches map with their values.
`double`	`evaluation(Map<HashString, ITreeNode<out Object>> matches)`	This evaluates the expression.
`ITreeNode<out Object>`	`getRoot()`	Return the root Node of the tree.
`HashString`	`toHashString()`	Similar to toString(), but returns a HashString.
`String`	`toString()`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - AST
```
AST(ITreeNode<out Object> root)
```
    Builds a new AST given its root node.
    
    Parameters:
    
    root - the root node
- Method Detail
  - assignVarValue
```
 AST assignVarValue(Map<HashString, ITreeNode<out Object>> matches)
```
    This method substitutes variables present in matches map with their values. It must involve only node of Typ=Var. The method must also recognize the values type stored in the map (they can be Const or Num).
    
    Parameters:
    
    matches - the map with variable values already assigned.
    
    Returns:
    
    a new ITree containing the instantiated variable
  - evaluation
```
 double evaluation(Map<HashString, ITreeNode<out Object>> matches)
```
    This evaluates the expression. If the matches map contains values which are not instanced, and the expression value cannot consequently be computed, 0d is returned.
    
    Parameters:
    
    matches - the map that binds each variable with its own value
    
    Returns:
    
    A number representing the value for this expression. If the expression can't be computed, an exception is thrown.
  - getRoot
```
 ITreeNode<out Object> getRoot()
```
    Return the root Node of the tree.
    
    Returns:
    
    the root element.
  - toHashString
```
 HashString toHashString()
```
    Similar to toString(), but returns a HashString.
    
    Returns:
    
    a HashString representation of this Object
  - toString
```
 String toString()
```