gnu.expr

Class NameLookup

java.lang.Object

java.util.AbstractMap<K,V>

gnu.kawa.util.AbstractHashTable<HashNode<K,V>,K,V>

gnu.kawa.util.GeneralHashTable<java.lang.Object,Declaration>

gnu.expr.NameLookup

All Implemented Interfaces:

java.util.Map<java.lang.Object,Declaration>

public class NameLookup
extends GeneralHashTable<java.lang.Object,Declaration>

Manages the set of declarations "currently" in scope.

Nested Class Summary

Nested classes/interfaces inherited from class java.util.AbstractMap

java.util.AbstractMap.SimpleEntry<K,V>, java.util.AbstractMap.SimpleImmutableEntry<K,V>

Nested classes/interfaces inherited from interface java.util.Map

java.util.Map.Entry<K,V>

Field Summary

Fields inherited from class gnu.kawa.util.AbstractHashTable

DEFAULT_INITIAL_SIZE, mask, num_bindings, table

Constructor Summary

Constructors

Constructor and Description
NameLookup(Language language)

Method Summary

Methods

Modifier and Type	Method and Description
boolean	doSaveTopLevelRedefs() When true, top-level defs should push rather then replace old ones.
static NameLookup	getInstance(Environment env, Language language) Get or create a NameLookup instance for a given Environment.
Language	getLanguage()
Declaration	lookup(java.lang.Object symbol, boolean function)
Declaration	lookup(java.lang.Object symbol, int namespace)
boolean	pop(Declaration decl)
void	pop(ScopeExp exp)
void	popSaveTopLevelRedefs()
void	push(Declaration decl)
void	push(ScopeExp exp)
void	pushSaveTopLevelRedefs()
void	removeSubsumed(Declaration decl) Remove visible declarations subsumed (hidden) by a given declaration.
static void	setInstance(Environment env, NameLookup instance)
void	setLanguage(Language language)
protected boolean	subsumedBy(Declaration decl, Declaration other) True if decl subsumes (hides) other.

Methods inherited from class gnu.kawa.util.GeneralHashTable

allocEntries, getEntryHashCode, getEntryNext, getNode, makeEntry, setEntryNext

Methods inherited from class gnu.kawa.util.AbstractHashTable

clear, entrySet, get, get, getOrDefault, hash, hashToIndex, matches, matches, put, put, rehash, remove, size

Methods inherited from class java.util.AbstractMap

clone, containsKey, containsValue, equals, hashCode, isEmpty, keySet, putAll, toString, values

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

NameLookup

public NameLookup(Language language)

Method Detail

getLanguage

public Language getLanguage()

setLanguage

public void setLanguage(Language language)

getInstance

public static NameLookup getInstance(Environment env,
                     Language language)

Get or create a NameLookup instance for a given Environment. We want the same NameLookup instance to be used for multiple interactive commands in the same "session", to preserve top-level declarations. We do that by registering it in the Environment.

setInstance

public static void setInstance(Environment env,
               NameLookup instance)

doSaveTopLevelRedefs

public boolean doSaveTopLevelRedefs()

When true, top-level defs should push rather then replace old ones. Otherwise, a module-level declaration should replace a matching previous declaration, to avoid leaks. However, sometimes we temporarily push new declarations that should not permanently replace old declarations - for example when a hygienic macro changes the current scope.

pushSaveTopLevelRedefs

public void pushSaveTopLevelRedefs()

popSaveTopLevelRedefs

public void popSaveTopLevelRedefs()

push

public void push(Declaration decl)

pop

public boolean pop(Declaration decl)

push

public void push(ScopeExp exp)

pop

public void pop(ScopeExp exp)

removeSubsumed

public void removeSubsumed(Declaration decl)

Remove visible declarations subsumed (hidden) by a given declaration. This is primarily used to avoid memory leaks.

subsumedBy

protected boolean subsumedBy(Declaration decl,
                 Declaration other)

True if decl subsumes (hides) other.

lookup

public Declaration lookup(java.lang.Object symbol,
                 int namespace)

lookup

public Declaration lookup(java.lang.Object symbol,
                 boolean function)