?? scope.java
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package tinybasic;import java.util.*;public class Scope { protected Scope prev; protected Scope global; Hashtable symbolTable; protected Scope(Scope prev){ this.prev=prev; symbolTable = new Hashtable(); } public Scope cloneScope(Scope prev){ Scope newScope = new Scope(prev); return newScope; } void insertVariable(String v,DTDataType t){ symbolTable.put(v.toLowerCase(),t); } public DTDataType getVariable(String v){ DTDataType t=(DTDataType)symbolTable.get(v.toLowerCase()); return t; } public int getVariableDimension(String v){ DTDataType t=getVariable(v); if(t!=null){ return t.getDimension(); } else { return 0; } } public int getVariableType(String v){ DTDataType t=getVariable(v); if(t!=null){ return t.getType(); } else { return 0; } } public boolean isArrayVariable(String s){ return (getVariableDimension(s) > 0); } public Scope getPrev(){ return prev; } }
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