org.antlr.symtab

Class BaseScope

java.lang.Object

org.antlr.symtab.BaseScope

All Implemented Interfaces:

Scope

Direct Known Subclasses:

GlobalScope, LocalScope, PredefinedScope, SymbolWithScope

public abstract class BaseScope
extends Object
implements Scope

An abstract base class that houses common functionality for scopes.

Field Summary

Fields

Modifier and Type	Field and Description
protected Scope	enclosingScope
protected List<Scope>	nestedScopesNotSymbols All directly contained scopes, typically LocalScopes within a LocalScope or a LocalScope within a FunctionSymbol.
protected Map<String,Symbol>	symbols All symbols defined in this scope; can include classes, functions, variables, or anything else that is a Symbol impl.

Constructor Summary

Constructors

Constructor and Description
BaseScope()
BaseScope(Scope enclosingScope)

Method Summary

Modifier and Type	Method and Description
void	define(Symbol sym) Define a symbol in this scope, throw IllegalArgumentException if sym already defined in this scope.
List<Scope>	getAllNestedScopedSymbols()
List<? extends Symbol>	getAllSymbols() Return all symbols found in all nested scopes.
List<Scope>	getEnclosingPathToRoot() Return (inclusive) list of all scopes on path to root scope.
Scope	getEnclosingScope() Scope in which this scope defined.
MethodSymbol	getEnclosingScopeOfType(Class<?> type) Walk up enclosingScope until we find an object of a specific type.
Map<String,? extends Symbol>	getMembers()
List<Scope>	getNestedScopedSymbols() Return all immediately enclosed scoped symbols in insertion order.
List<Scope>	getNestedScopes() Return a list of scopes nested within this scope.
int	getNumberOfSymbols() Number of symbols in this specific scope
Scope	getOuterMostEnclosingScope() Walk up enclosingScope until we find topmost.
Scope	getParentScope() Where to look next for symbols if just one parent; superclass or enclosing scope.
List<Scope>	getParentScopes() Multiple superclass or interface implementations and the like...
Symbol	getSymbol(String name) Get symbol if name defined within this specific scope
Set<String>	getSymbolNames() Return the set of names associated with all symbols in the scope.
List<? extends Symbol>	getSymbols() Return the symbols defined within this scope.
void	nest(Scope scope) Add a nested scope to this scope; could also be a FunctionSymbol if your language allows nested functions.
Symbol	resolve(String name) Look up name in this scope or recursively in parent scope if not here
void	setEnclosingScope(Scope enclosingScope) What scope encloses this scope.
String	toQualifierString(String separator) Return scopes from to current with separator in between
String	toScopeStackString(String separator)
String	toString()
String	toTestString()
String	toTestString(String separator, String scopePathSeparator)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.antlr.symtab.Scope

getName

Field Detail

enclosingScope

protected Scope enclosingScope

symbols

protected Map<String,Symbol> symbols

All symbols defined in this scope; can include classes, functions, variables, or anything else that is a Symbol impl. It does NOT include non-Symbol-based things like LocalScope. See nestedScopes.

nestedScopesNotSymbols

protected List<Scope> nestedScopesNotSymbols

All directly contained scopes, typically LocalScopes within a LocalScope or a LocalScope within a FunctionSymbol. This does not include SymbolWithScope objects.

Constructor Detail

BaseScope

public BaseScope()

BaseScope

public BaseScope(Scope enclosingScope)

Method Detail

getMembers

public Map<String,? extends Symbol> getMembers()

getSymbol

public Symbol getSymbol(String name)

Description copied from interface: Scope

Get symbol if name defined within this specific scope

Specified by:

getSymbol in interface Scope

setEnclosingScope

public void setEnclosingScope(Scope enclosingScope)

Description copied from interface: Scope

What scope encloses this scope. E.g., if this scope is a function, the enclosing scope could be a class. The BaseScope class automatically adds this to nested scope list of s.

Specified by:

setEnclosingScope in interface Scope

getAllNestedScopedSymbols

public List<Scope> getAllNestedScopedSymbols()

getNestedScopedSymbols

public List<Scope> getNestedScopedSymbols()

Description copied from interface: Scope

Return all immediately enclosed scoped symbols in insertion order. E.g., a class would return all nested classes and any methods. There does not have to be an explicit pointer to the nested scopes. This method generally searches the list of symbols looking for symbols that implement Scope. Gets only those scopes that are in the symbols list of "this" scope. E.g., does not get local scopes within a function. This returns a subset or same set as Scope.getNestedScopes().

Specified by:

getNestedScopedSymbols in interface Scope

getNestedScopes

public List<Scope> getNestedScopes()

Description copied from interface: Scope

Return a list of scopes nested within this scope. It has both ScopedSymbols and scopes without symbols, such as LocalScopes. This returns a superset or same set as Scope.getNestedScopedSymbols(). ScopedSymbols come first then all non-ScopedSymbols Scope objects. Insertion order is used within each sublist.

Specified by:

getNestedScopes in interface Scope

nest

public void nest(Scope scope)
          throws IllegalArgumentException

Add a nested scope to this scope; could also be a FunctionSymbol if your language allows nested functions.

Specified by:

nest in interface Scope

Throws:

IllegalArgumentException - if you pass in a SymbolWithScope.

resolve

public Symbol resolve(String name)

Description copied from interface: Scope

Look up name in this scope or recursively in parent scope if not here

Specified by:

resolve in interface Scope

define

public void define(Symbol sym)
            throws IllegalArgumentException

Description copied from interface: Scope

Define a symbol in this scope, throw IllegalArgumentException if sym already defined in this scope. This alters sym: 1. Set insertion order number of sym 2. Set sym's scope to be the scope. The order in which symbols are defined must be preserved so that Scope.getSymbols() returns the list in definition order.

Specified by:

define in interface Scope

Throws:

IllegalArgumentException

getParentScope

public Scope getParentScope()

Description copied from interface: Scope

Where to look next for symbols if just one parent; superclass or enclosing scope.

Specified by:

getParentScope in interface Scope

getParentScopes

public List<Scope> getParentScopes()

Description copied from interface: Scope

Multiple superclass or interface implementations and the like...

Specified by:

getParentScopes in interface Scope

getEnclosingScope

public Scope getEnclosingScope()

Description copied from interface: Scope

Scope in which this scope defined. null if no enclosing scope

Specified by:

getEnclosingScope in interface Scope

getOuterMostEnclosingScope

public Scope getOuterMostEnclosingScope()

Walk up enclosingScope until we find topmost. Note this is enclosing scope not necessarily parent. This will usually be a global scope or something, depending on your scope tree.

getEnclosingScopeOfType

public MethodSymbol getEnclosingScopeOfType(Class<?> type)

Walk up enclosingScope until we find an object of a specific type. E.g., if you want to get enclosing method, you would pass in MethodSymbol.class, unless of course you have created a subclass for your language implementation.

getEnclosingPathToRoot

public List<Scope> getEnclosingPathToRoot()

Description copied from interface: Scope

Return (inclusive) list of all scopes on path to root scope. The first element is the current scope and the last is the root scope.

Specified by:

getEnclosingPathToRoot in interface Scope

getSymbols

public List<? extends Symbol> getSymbols()

Description copied from interface: Scope

Return the symbols defined within this scope. The order of insertion into the scope is the order returned in this list.

Specified by:

getSymbols in interface Scope

getAllSymbols

public List<? extends Symbol> getAllSymbols()

Description copied from interface: Scope

Return all symbols found in all nested scopes. The order of insertion into the scope is the order returned in this list for each scope. The scopes are traversed in the order in which they are encountered in the input.

Specified by:

getAllSymbols in interface Scope

getNumberOfSymbols

public int getNumberOfSymbols()

Description copied from interface: Scope

Number of symbols in this specific scope

Specified by:

getNumberOfSymbols in interface Scope

getSymbolNames

public Set<String> getSymbolNames()

Description copied from interface: Scope

Return the set of names associated with all symbols in the scope.

Specified by:

getSymbolNames in interface Scope

toString

public String toString()

Overrides:

toString in class Object

toScopeStackString

public String toScopeStackString(String separator)

toQualifierString

public String toQualifierString(String separator)

Description copied from interface: Scope

Return scopes from to current with separator in between

Specified by:

toQualifierString in interface Scope

toTestString

public String toTestString()

toTestString

public String toTestString(String separator,
                           String scopePathSeparator)