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package st;
import java.util.*;
/**
* Class which provides methods for interacting with and managing
* the symbol table. Maintains context-awareness to keep the state
* of each symbol consistent.
*/
public class SymbolTable {
private HashMap<String,AbstractInstance> symt; // the mapping of ids to Instances
private HashMap<TypeEnum,String> active; // the current scope of the visitor (class, method)
public SymbolTable() {
this.symt = new HashMap<>();
this.active = new HashMap<>();
}
public String toString() {
StringBuilder mapAsString = new StringBuilder("{");
for (String key : this.symt.keySet()) {
mapAsString.append(key + ":" + this.symt.get(key) + ", ");
}
mapAsString.delete(mapAsString.length()-2, mapAsString.length()).append("}");
return mapAsString.toString();
}
/**
* Methods intended to be used during the first pass
*/
public void put(String id, AbstractInstance symbol) {
this.symt.put(id, symbol);
}
/**
* Methods intended to be used during the second pass
*/
public void setActive(TypeEnum type, String id) {
this.active.put(type, id);
}
public void addAttribute(String arg) {
String str = this.active.get(TypeEnum.classname);
ClassInstance cls = this.getClass(str);
TypeInstance attr = this.getType(arg);
attr.setScope(cls);
cls.addAttribute(attr);
}
public void addMethod(String mtd) {
String str = this.active.get(TypeEnum.classname);
ClassInstance cls = this.getClass(str);
MethodInstance lmtd = this.getMethod(mtd);
lmtd.setScope(cls);
cls.addMethod(lmtd);
}
public void addParameter(String arg) {
String str = this.active.get(TypeEnum.method);
MethodInstance mtd = this.getMethod(str);
TypeInstance para = this.getType(arg);
para.setScope(mtd);
mtd.addArgument(para); // also adds to local vars
}
public void addLocal(String lvar) {
String str = this.active.get(TypeEnum.method);
MethodInstance mtd = this.getMethod(str);
TypeInstance var = this.getType(lvar);
var.setScope(mtd);
mtd.addArgument(var);
}
/**
* Methods to safely retrieve differentiable types
* in `typecheck', `vaporize' libraries
*/
public TypeInstance getType(String id) {
AbstractInstance symbol;
return ((symbol = this.symt.get(id)) !=
null && symbol.getType() != TypeEnum.classname &&
symbol.getType() != TypeEnum.method) ?
(TypeInstance) symbol : null;
}
public MethodInstance getMethod(String id) {
AbstractInstance symbol;
return ((symbol = this.symt.get(id)) !=
null && symbol.getType() == TypeEnum.method) ?
(MethodInstance) symbol : null;
}
public ClassInstance getClass(String id) {
AbstractInstance symbol;
return ((symbol = this.symt.get(id)) !=
null && symbol.getType() == TypeEnum.classname) ?
(ClassInstance) symbol : null;
}
}
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