mirror of https://github.com/aamine/cbc
102 lines
2.6 KiB
Java
102 lines
2.6 KiB
Java
package net.loveruby.cflat.ast;
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import net.loveruby.cflat.compiler.ErrorHandler;
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import net.loveruby.cflat.exception.*;
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import java.util.*;
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abstract public class Scope {
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protected Scope parent;
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protected List children;
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protected Map entities;
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protected long numAllEntities;
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public Scope(Scope up) {
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parent = up;
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if (up != null) up.addChild(this);
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children = new ArrayList();
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numAllEntities = -1;
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entities = new LinkedHashMap();
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}
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abstract public boolean isToplevel();
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public ToplevelScope toplevel() {
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Scope s = this;
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while (!s.isToplevel()) {
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s = s.parent;
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}
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return (ToplevelScope)s;
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}
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// Returns parent scope.
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// If this scope is a TopScope, parent() returns null.
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public Scope parent() {
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return parent;
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}
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protected void addChild(Scope s) {
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children.add(s);
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}
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// Returns a list of all child scopes.
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// Does NOT include myself.
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protected Iterator allChildren() {
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List result = new ArrayList();
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collectChildren(result);
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return result.iterator();
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}
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protected void collectChildren(List buf) {
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Iterator cs = children.iterator();
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while (cs.hasNext()) {
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Scope c = (Scope)cs.next();
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buf.add(c);
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c.collectChildren(buf);
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}
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}
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/** Declare variable or function in this scope. */
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// #@@range/declareEntity{
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public void declareEntity(Entity ent) {
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if (entities.containsKey(ent.name())) {
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throw new Error("duplicated entity: " + ent.name());
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}
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entities.put(ent.name(), ent);
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}
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// #@@}
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public boolean isDefinedLocally(String name) {
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return entities.containsKey(name);
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}
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// #@@range/get{
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public Entity get(String name) throws SemanticException {
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Entity ent = (Entity)entities.get(name);
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if (ent != null) {
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return ent;
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}
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else {
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return parent.get(name);
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}
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}
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// #@@}
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public long numEntities() {
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return entities.size();
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}
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public void checkReferences(ErrorHandler h) {
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Iterator ents = entities.values().iterator();
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while (ents.hasNext()) {
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Entity ent = (Entity)ents.next();
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if (ent.isDefined() && ent.isPrivate() && !ent.isRefered()) {
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h.warn(ent.location(), "unused variable: " + ent.name());
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}
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}
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Iterator scopes = children.iterator();
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while (scopes.hasNext()) {
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Scope s = (Scope)scopes.next();
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s.checkReferences(h);
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}
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}
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}
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