AbstractPtalonEvaluator

java.lang.Object
- ptolemy.actor.ptalon.AbstractPtalonEvaluator

Direct Known Subclasses:

PtalonEvaluator
```
public abstract class AbstractPtalonEvaluator
extends java.lang.Object
```
A helper class to store information, like variable scope info, for the Ptalon compiler. This class manages references to all elements created as a result of parsing a Ptalon file, and whether they have been instantiated in Ptolemy.

Since:

Ptolemy II 6.1

Version:

$Id$

Author:

Adam Cataldo, Elaine Cheong

Pt.AcceptedRating:

Yellow (celaine)

Pt.ProposedRating:

Yellow (celaine)

Nested Class Summary

Nested Classes
Modifier and Type	Class and Description
`protected class`	`AbstractPtalonEvaluator.IfTree` This is a representation of an if/else construct in Ptalon.
`protected class`	`AbstractPtalonEvaluator.PtalonExpressionScope` FIXME comment

Field Summary

Fields
Modifier and Type	Field and Description
`protected PtalonActor`	`_actor` The actor in which this PtalonCompilerInfo is used.
`protected AbstractPtalonEvaluator.IfTree`	`_currentIfTree` Some descendent of the root tree to which new input symbols should be added.
`protected java.util.Hashtable<java.lang.String,java.net.URL>`	`_imports` A list of the import symbols and their corresponding files.
`protected AbstractPtalonEvaluator.PtalonExpressionScope`	`_scope` The expression scope for this code manager.
`protected java.util.Map<java.lang.String,TypedIOPort>`	`_transparentRelations` Maps names of transparent relations to ports, which should be multiports.

Constructor Summary

Constructors
Constructor and Description

AbstractPtalonEvaluator(PtalonActor actor)
Create a new AbstractPtalonEvaluator in the specified PtalonActor.

Constructors
Constructor and Description
`AbstractPtalonEvaluator(PtalonActor actor)` Create a new AbstractPtalonEvaluator in the specified PtalonActor.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`protected static java.lang.String`	`_getIndentPrefix(int level)` Return a number of spaces that is proportional to the argument.
`protected int`	`_getTimesEntered()` Return the number of times the current if tree has been entered.
`protected java.lang.String`	`_getType(java.lang.String symbol)` Return the type associated with the given symbol in the current scope.
`protected java.lang.String`	`_getTypeForScope(java.lang.String symbol)` Return the type associated with the given symbol in the current scope.
`protected boolean`	`_inNewWhileIteration()` Return true if in a new iteration of a while block.
`protected boolean`	`_isPreservingTransformation()`
`protected void`	`_processAttributes(NamedObj object)`
`protected void`	`_resetParameters(boolean reset)` Set whether to reset parameters when the actor is populated and the parameters already exist for the actor.
`protected void`	`_setPreservingTransformation(boolean b)`
`void`	`addActorParameter(java.lang.String name)` Add a PtalonParameter to the PtalonActor with the specified name.
`void`	`addActorParameter(java.lang.String name, java.lang.String expression)` Add an invisible PtalonParameter to the PtalonActor with the specified name.
`void`	`addInPort(java.lang.String name)` Add a TypedIOPort to the PtalonActor with the specified name, and input flow type.
`void`	`addOutPort(java.lang.String name)` Add a TypedIOPort to the PtalonActor with the specified name, and output flow type.
`void`	`addParameter(java.lang.String name)` Add a Parameter to the PtalonActor with the specified name.
`void`	`addParameter(java.lang.String name, java.lang.String expression)` Add an invisible Parameter to the PtalonActor with the specified name and the given expression as its value.
`void`	`addPort(java.lang.String name)` Add a TypedIOPort to the PtalonActor with the specified name.
`void`	`addRelation(java.lang.String name)` Add a TypedIORelation to the PtalonActor with the specified name.
`void`	`addSymbol(java.lang.String name, java.lang.String type)` Add a symbol with the given name and type to the symbol table at the current level of the if-tree hierarchy.
`void`	`addTransparentRelation(java.lang.String name)` Add a transparent relation to the PtalonActor with the specified name.
`void`	`assignInternalParameters()` Assign any internal parameters in the order they were set.
`void`	`enterForScope(java.lang.String scope, PtalonAST forBlock, PtalonPopulator populator)` Enter the named for-block subscope.
`void`	`enterIfScope(java.lang.String scope)` Enter the named subscope.
`void`	`enterTransformation(boolean incremental)`
`boolean`	`evaluateBoolean(java.lang.String expression)` Evaluate the given expression and return its boolean value.
`Token`	`evaluateExpression(java.lang.String expression)` Evaluate the given expression and return the corresponding token.
`void`	`evaluateForScope()` Evaluate the current for block, assuming there is one.
`java.lang.String`	`evaluateString(java.lang.String expression)` Evaluate the given input expression and return a string representation of it, or null, if there is some reason it cannot be evaluated.
`void`	`exitForScope()` Exit the current for scope.
`void`	`exitIfScope()` Exit the current if scope.
`void`	`exitTransformation()`
`java.lang.String`	`getMappedName(java.lang.String symbol)` Get the unique name for the symbol in the PtalonActor.
`boolean`	`hasUnassignedParameters()` Return whether there are unassigned parameters to be handled with the `assignInternalParameters()` method.
`boolean`	`inScope(java.lang.String symbol)` Return true if the given symbol exists in the current scope.
`boolean`	`isCreated(java.lang.String symbol)` Return true if an entity was created in PtalonActor for the given symbol.
`boolean`	`isForReady()` Return true if the boolean for the current conditional is ready to be entered.
`boolean`	`isIfReady()` Return true if the boolean for the current conditional is ready to be entered.
`boolean`	`isReady()` Return true if the current piece of code is ready to be entered.
`void`	`negateObject(java.lang.String name)`
`void`	`optionalObject(java.lang.String name)`
`java.lang.String`	`popForStatement()` Pop out of the scope of the current for statement and into its container block's scope.
`java.lang.String`	`popIfStatement()` Pop out of the scope of the current if statement and into its container block's scope.
`void`	`preserveObject(java.lang.String name)`
`void`	`pushForStatement(java.lang.String variable, java.lang.String initExpr, java.lang.String satExpr)` Push into the scope of a new for statement contained as a sub-block of the current (FIXME: if or for) statement.
`void`	`pushIfStatement()` Push into the scope of a new if statement contained as a sub-block of the current if statement.
`void`	`removeObject(java.lang.String name)`
`void`	`setActiveBranch(boolean branch)` Set the active branch for the current if statement.
`void`	`setActorSymbol(java.lang.String symbol)` Set the symbol in the PtalonCode which represents this AbstractPtalonEvaluator's actor.
`void`	`setCurrentBranch(boolean branch)` Set the current branch that's being walked.
`void`	`setNextExpression(java.lang.String nextExpr)` Set the next expression for the current for statement scope, assuming the current scope is a for statement and not an if statement.
`void`	`startAtTop()` Prepare the compiler to start at the outermost scope of the Ptalon program during run time.

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

- Field Detail
  - _actor
```
protected PtalonActor _actor
```
    The actor in which this PtalonCompilerInfo is used.
  - _currentIfTree
```
protected AbstractPtalonEvaluator.IfTree _currentIfTree
```
    Some descendent of the root tree to which new input symbols should be added.
  - _imports
```
protected java.util.Hashtable<java.lang.String,java.net.URL> _imports
```
    A list of the import symbols and their corresponding files.
  - _scope
```
protected AbstractPtalonEvaluator.PtalonExpressionScope _scope
```
    The expression scope for this code manager.
  - _transparentRelations
```
protected java.util.Map<java.lang.String,TypedIOPort> _transparentRelations
```
    Maps names of transparent relations to ports, which should be multiports. A key may map to null if no port has been assigned to it.
- Constructor Detail
  - AbstractPtalonEvaluator
```
public AbstractPtalonEvaluator(PtalonActor actor)
```
    Create a new AbstractPtalonEvaluator in the specified PtalonActor.
    
    Parameters:
    
    actor - The actor to manage the code for.
- Method Detail
  - addActorParameter
```
public void addActorParameter(java.lang.String name)
                       throws PtalonRuntimeException
```
    Add a PtalonParameter to the PtalonActor with the specified name.
    
    Parameters:
    
    name - The name of the parameter.
    
    Throws:
    
    PtalonRuntimeException - If the symbol does not exist, or if the symbol already has a parameter associated with it, or if an IllegalActionException is thrown trying to create the parameter.
  - addActorParameter
```
public void addActorParameter(java.lang.String name,
                              java.lang.String expression)
                       throws PtalonRuntimeException
```
    Add an invisible PtalonParameter to the PtalonActor with the specified name.
    
    Parameters:
    
    name - The name of the parameter.
    
    expression - The expression representing the parameter.
    
    Throws:
    
    PtalonRuntimeException - If the symbol does not exist, or if the symbol already has a parameter associated with it, or if an IllegalActionException is thrown trying to create the parameter.
  - addInPort
```
public void addInPort(java.lang.String name)
               throws PtalonRuntimeException
```
    Add a TypedIOPort to the PtalonActor with the specified name, and input flow type.
    
    Parameters:
    
    name - The name of the port.
    
    Throws:
    
    PtalonRuntimeException - If the symbol does not exist, or if the symbol already has a port associated with it, or if an IllegalActionException is thrown trying to create the port.
  - addOutPort
```
public void addOutPort(java.lang.String name)
                throws PtalonRuntimeException
```
    Add a TypedIOPort to the PtalonActor with the specified name, and output flow type.
    
    Parameters:
    
    name - The name of the port.
    
    Throws:
    
    PtalonRuntimeException - If the symbol does not exist, or if the symbol already has a port associated with it, or if an IllegalActionException is thrown trying to create the port.
  - addParameter
```
public void addParameter(java.lang.String name)
                  throws PtalonRuntimeException
```
    Add a Parameter to the PtalonActor with the specified name.
    
    Parameters:
    
    name - The name of the parameter.
    
    Throws:
    
    PtalonRuntimeException - If the symbol does not exist, or if the symbol already has a parameter associated with it, or if an IllegalActionException is thrown trying to create the parameter.
  - addParameter
```
public void addParameter(java.lang.String name,
                         java.lang.String expression)
                  throws PtalonRuntimeException
```
    Add an invisible Parameter to the PtalonActor with the specified name and the given expression as its value.
    
    Parameters:
    
    name - The name of the parameter.
    
    expression - The expression representing the parameter.
    
    Throws:
    
    PtalonRuntimeException - If the symbol does not exist, or if the symbol already has a parameter associated with it, or if an IllegalActionException is thrown trying to create the parameter.
  - addPort
```
public void addPort(java.lang.String name)
             throws PtalonRuntimeException
```
    Add a TypedIOPort to the PtalonActor with the specified name.
    
    Parameters:
    
    name - The name of the port.
    
    Throws:
    
    PtalonRuntimeException - If the symbol does not exist, or if the symbol already has a port associated with it, or if an IllegalActionException is thrown trying to create the port.
  - addRelation
```
public void addRelation(java.lang.String name)
                 throws PtalonRuntimeException
```
    Add a TypedIORelation to the PtalonActor with the specified name.
    
    Parameters:
    
    name - The name of the relation.
    
    Throws:
    
    PtalonRuntimeException - If the symbol does not exist, or if the symbol already has a relation associated with it, or if an IllegalActionException is thrown trying to create the relation.
  - addSymbol
```
public void addSymbol(java.lang.String name,
                      java.lang.String type)
               throws PtalonScopeException
```
    Add a symbol with the given name and type to the symbol table at the current level of the if-tree hierarchy.
    
    Parameters:
    
    name - The symbol name.
    
    type - The symbol type.
    
    Throws:
    
    PtalonScopeException - If a symbol with this name has already been added somewhere in the current scope.
  - addTransparentRelation
```
public void addTransparentRelation(java.lang.String name)
                            throws PtalonRuntimeException
```
    Add a transparent relation to the PtalonActor with the specified name. A transparent relation is not the same as a relation. Rather, it provides a means for connecting multiple ports to an input port. It is transparent in that if this transparent relation is connected to an input port I, then any connections made to the transparent relation will be as if they were connected directly to I, instead of through a relation.
    
    Parameters:
    
    name - The name of the relation.
    
    Throws:
    
    PtalonRuntimeException - If in a new for iteration but no containing for block is found.
  - assignInternalParameters
```
public void assignInternalParameters()
                              throws PtalonRuntimeException
```
    Assign any internal parameters in the order they were set.
    
    Throws:
    
    PtalonRuntimeException - If there is any trouble assigning parameter values.
  - enterForScope
```
public void enterForScope(java.lang.String scope,
                          PtalonAST forBlock,
                          PtalonPopulator populator)
                   throws PtalonRuntimeException
```
    Enter the named for-block subscope.
    
    Parameters:
    
    scope - The named subscope.
    
    forBlock - The AST for the subscope.
    
    populator - The PtalonPopulator that called this statement.
    
    Throws:
    
    PtalonRuntimeException - If the subscope does not exist.
  - enterIfScope
```
public void enterIfScope(java.lang.String scope)
                  throws PtalonRuntimeException
```
    Enter the named subscope.
    
    Parameters:
    
    scope - The named subscope.
    
    Throws:
    
    PtalonRuntimeException - If the subscope does not exist.
  - enterTransformation
```
public void enterTransformation(boolean incremental)
                         throws PtalonRuntimeException
```
    Throws:
    
    PtalonRuntimeException
  - evaluateBoolean
```
public boolean evaluateBoolean(java.lang.String expression)
                        throws PtalonRuntimeException
```
    Evaluate the given expression and return its boolean value. The expression should return a boolean value, otherwise an exception is thrown.
    
    Parameters:
    
    expression - The expression to evaluate.
    
    Returns:
    
    The boolean result of evaluation.
    
    Throws:
    
    PtalonRuntimeException - If the result is not a boolean.
  - evaluateExpression
```
public Token evaluateExpression(java.lang.String expression)
                         throws PtalonRuntimeException
```
    Evaluate the given expression and return the corresponding token.
    
    Parameters:
    
    expression - The expression to evaluate.
    
    Returns:
    
    The result of evaluation.
    
    Throws:
    
    PtalonRuntimeException - If unable to evaluate the expression.
  - evaluateForScope
```
public void evaluateForScope()
                      throws PtalonRuntimeException
```
    Evaluate the current for block, assuming there is one.
    
    Throws:
    
    PtalonRuntimeException - If there is any trouble evaluating this for block.
  - evaluateString
```
public java.lang.String evaluateString(java.lang.String expression)
```
    Evaluate the given input expression and return a string representation of it, or null, if there is some reason it cannot be evaluated.
    
    Parameters:
    
    expression - The input expression.
    
    Returns:
    
    The evaluated value, or null if evaluation is not possible.
  - exitForScope
```
public void exitForScope()
                  throws PtalonRuntimeException
```
    Exit the current for scope.
    
    Throws:
    
    PtalonRuntimeException - If not in a for-block scope.
  - exitIfScope
```
public void exitIfScope()
                 throws PtalonRuntimeException
```
    Exit the current if scope.
    
    Throws:
    
    PtalonRuntimeException - If already at the top-level if scope.
  - exitTransformation
```
public void exitTransformation()
                        throws PtalonRuntimeException
```
    Throws:
    
    PtalonRuntimeException
  - getMappedName
```
public java.lang.String getMappedName(java.lang.String symbol)
                               throws PtalonRuntimeException
```
    Get the unique name for the symbol in the PtalonActor.
    
    Parameters:
    
    symbol - The symbol to test.
    
    Returns:
    
    The unique name.
    
    Throws:
    
    PtalonRuntimeException - If no such symbol exists.
  - hasUnassignedParameters
```
public boolean hasUnassignedParameters()
```
    Return whether there are unassigned parameters to be handled with the assignInternalParameters() method.
    
    Returns:
    
    true if there are unassigned parameters, and false otherwise.
  - inScope
```
public boolean inScope(java.lang.String symbol)
```
    Return true if the given symbol exists in the current scope.
    
    Parameters:
    
    symbol - The symbol to test.
    
    Returns:
    
    true If the given symbol exists in the current scope.
  - isCreated
```
public boolean isCreated(java.lang.String symbol)
                  throws PtalonRuntimeException
```
    Return true if an entity was created in PtalonActor for the given symbol. This symbol is assumed to be in the current scope.
    
    Parameters:
    
    symbol - The symbol to test.
    
    Returns:
    
    true If an entity was created for this symbol.
    
    Throws:
    
    PtalonRuntimeException - If the symbol is not in the current scope.
  - isForReady
```
public boolean isForReady()
                   throws PtalonRuntimeException
```
    Return true if the boolean for the current conditional is ready to be entered. It is ready when all ports, parameters, and relations in the containing scope have been created, when all parameters in the containing scope have been assigned values, and when in a branch of an if-block or for-block that is active.
    
    Returns:
    
    true If the current for-block scope is ready to be entered.
    
    Throws:
    
    PtalonRuntimeException - If it is thrown trying to access a parameter.
  - isIfReady
```
public boolean isIfReady()
                  throws PtalonRuntimeException
```
    Return true if the boolean for the current conditional is ready to be entered. It is ready when all ports, parameters, and relations in the containing scope have been created, when all parameters in the containing scope have been assigned values, and when in a branch of an if-block that is active.
    
    Returns:
    
    true If the current if-block scope is ready to be entered.
    
    Throws:
    
    PtalonRuntimeException - If it is thrown trying to access a parameter.
  - isReady
```
public boolean isReady()
                throws PtalonRuntimeException
```
    Return true if the current piece of code is ready to be entered. This is used by port, parameter, and relation declarations only. It is ready when all ports, parameters, and relations in the containing scope have been created, when all parameters in the containing scope have been assigned values, and when in a branch of an if-block that is active.
    
    Returns:
    
    true If the current if-block scope is ready to be entered.
    
    Throws:
    
    PtalonRuntimeException - If it is thrown trying to access a parameter.
  - negateObject
```
public void negateObject(java.lang.String name)
                  throws PtalonRuntimeException
```
    Throws:
    
    PtalonRuntimeException
  - optionalObject
```
public void optionalObject(java.lang.String name)
                    throws PtalonRuntimeException
```
    Throws:
    
    PtalonRuntimeException
  - popForStatement
```
public java.lang.String popForStatement()
                                 throws PtalonScopeException
```
    Pop out of the scope of the current for statement and into its container block's scope.
    
    Returns:
    
    The unique name of the for-statement block being exited.
    
    Throws:
    
    PtalonScopeException - If the current scope is already the outermost scope.
  - popIfStatement
```
public java.lang.String popIfStatement()
                                throws PtalonScopeException
```
    Pop out of the scope of the current if statement and into its container block's scope.
    
    Returns:
    
    The unique name of the if-statement block being exited.
    
    Throws:
    
    PtalonScopeException - If the current scope is already the outermost scope.
  - preserveObject
```
public void preserveObject(java.lang.String name)
                    throws PtalonRuntimeException
```
    Throws:
    
    PtalonRuntimeException
  - pushForStatement
```
public void pushForStatement(java.lang.String variable,
                             java.lang.String initExpr,
                             java.lang.String satExpr)
```
    Push into the scope of a new for statement contained as a sub-block of the current (FIXME: if or for) statement.
    
    Parameters:
    
    variable - The variable associated with the for statement.
    
    initExpr - The expression representing the initial value for the variable.
    
    satExpr - The expression evaluated before executing the for statement body.
  - pushIfStatement
```
public void pushIfStatement()
```
    Push into the scope of a new if statement contained as a sub-block of the current if statement.
  - removeObject
```
public void removeObject(java.lang.String name)
                  throws PtalonRuntimeException
```
    Throws:
    
    PtalonRuntimeException
  - setActiveBranch
```
public void setActiveBranch(boolean branch)
```
    Set the active branch for the current if statement.
    
    Parameters:
    
    branch - The branch to set.
  - setActorSymbol
```
public void setActorSymbol(java.lang.String symbol)
                    throws PtalonScopeException
```
    Set the symbol in the PtalonCode which represents this AbstractPtalonEvaluator's actor.
    
    Parameters:
    
    symbol - The name of this actor in the Ptalon file.
    
    Throws:
    
    PtalonScopeException - If the symbol has been added already, or if there is some problem accessing its associated file.
  - setCurrentBranch
```
public void setCurrentBranch(boolean branch)
```
    Set the current branch that's being walked.
    
    Parameters:
    
    branch - True if the true branch is being walked.
  - setNextExpression
```
public void setNextExpression(java.lang.String nextExpr)
```
    Set the next expression for the current for statement scope, assuming the current scope is a for statement and not an if statement.
    
    Parameters:
    
    nextExpr - The expression to represent the next statement.
  - startAtTop
```
public void startAtTop()
```
    Prepare the compiler to start at the outermost scope of the Ptalon program during run time.
  - _getIndentPrefix
```
protected static java.lang.String _getIndentPrefix(int level)
```
    Return a number of spaces that is proportional to the argument. If the argument is negative or zero, return an empty string.
    
    Parameters:
    
    level - The level of indenting represented by the spaces.
    
    Returns:
    
    A string with zero or more spaces.
  - _getTimesEntered
```
protected int _getTimesEntered()
```
    Return the number of times the current if tree has been entered.
    
    Returns:
    
    The number of times the current if tree has been entered.
  - _getType
```
protected java.lang.String _getType(java.lang.String symbol)
                             throws PtalonScopeException
```
    Return the type associated with the given symbol in the current scope.
    
    Parameters:
    
    symbol - The symbol under test.
    
    Returns:
    
    The type associated with the given symbol.
    
    Throws:
    
    PtalonScopeException - If the symbol is not in the current scope.
  - _getTypeForScope
```
protected java.lang.String _getTypeForScope(java.lang.String symbol)
                                     throws PtalonScopeException
```
    Return the type associated with the given symbol in the current scope. This is the same as getType, but it is used to avoid a name conflict in PtalonEvaluator.PtalonExpressionScope
    
    Parameters:
    
    symbol - The symbol under test.
    
    Returns:
    
    The type associated with the given symbol.
    
    Throws:
    
    PtalonScopeException - If the symbol is not in the current scope.
  - _inNewWhileIteration
```
protected boolean _inNewWhileIteration()
```
    Return true if in a new iteration of a while block.
    
    Returns:
    
    true If in a new iteration of a while block.
  - _isPreservingTransformation
```
protected boolean _isPreservingTransformation()
```
  - _processAttributes
```
protected void _processAttributes(NamedObj object)
                           throws PtalonRuntimeException
```
    Parameters:
    
    object -
    
    Throws:
    
    PtalonRuntimeException
  - _resetParameters
```
protected void _resetParameters(boolean reset)
```
    Set whether to reset parameters when the actor is populated and the parameters already exist for the actor.
    
    Parameters:
    
    reset - Whether to reset parameters.
  - _setPreservingTransformation
```
protected void _setPreservingTransformation(boolean b)
```

Class AbstractPtalonEvaluator

Nested Class Summary

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

_actor

_currentIfTree

_imports

_scope

_transparentRelations

Constructor Detail

AbstractPtalonEvaluator

Method Detail

addActorParameter

addActorParameter

addInPort

addOutPort

addParameter

addParameter

addPort

addRelation

addSymbol

addTransparentRelation

assignInternalParameters

enterForScope

enterIfScope

enterTransformation

evaluateBoolean

evaluateExpression

evaluateForScope

evaluateString

exitForScope

exitIfScope

exitTransformation

getMappedName

hasUnassignedParameters

inScope

isCreated

isForReady

isIfReady

isReady

negateObject

optionalObject

popForStatement

popIfStatement

preserveObject

pushForStatement

pushIfStatement

removeObject

setActiveBranch

setActorSymbol

setCurrentBranch

setNextExpression

startAtTop

_getIndentPrefix

_getTimesEntered

_getType

_getTypeForScope

_inNewWhileIteration

_isPreservingTransformation

_processAttributes

_resetParameters

_setPreservingTransformation