ClReader.lex

// $Id$

package EDU.Washington.grad.gjb.cassowary;
import java_cup.runtime.Symbol;

%%

%cup

%public

DIGIT   = [0-9]

ALPHA   = [A-Za-z]

ALPHANUM  = [A-Za-z0-9_]

ID    = {ALPHA}{ALPHANUM}*

ws    = [ \t\r\n\f]+

%init{

  // code to go into constructor

%init}

%{
  // added code to lexer class

  private java.util.Hashtable m_variable_name_object_hash;
  public boolean m_debug_lex = false;

  public void setVariableNameObjectHash(java.util.Hashtable variable_name_object_hash)
  {
    m_variable_name_object_hash = variable_name_object_hash;
  }

%}

%%

{ws}        { /* skip white space */ }  
  
">="        { return new Symbol(sym.GEQ); }   
  
"<="        { return new Symbol(sym.LEQ); }

"="         { return new Symbol(sym.EQ); }

"+"         { return new Symbol(sym.PLUS); }

"-"         { return new Symbol(sym.MINUS); }

"*"         { return new Symbol(sym.TIMES); }

"/"         { return new Symbol(sym.DIVIDE); }

"("         { return new Symbol(sym.LPAREN); }

")"         { return new Symbol(sym.RPAREN); }

{DIGIT}+("."{DIGIT}*)?|("."{DIGIT}+)  { return new Symbol(sym.NUMBER, new Double(yytext()));  }

{ID}        {
          String variable_name = new String(yytext());

          if (m_debug_lex) {
            System.out.println("Lexical analysis found <" + variable_name + ">");
          }

          if (! m_variable_name_object_hash.containsKey(variable_name)) {
            if (m_debug_lex) {
              System.out.println("  Putting it in hash for the first time.");
            }

            ClVariable variable = new ClVariable();

            Object return_value = m_variable_name_object_hash.put(variable_name, variable);

            if (return_value != null) {
              System.err.println("Variable was already in hash!!!!!");
            }

            if (m_debug_lex) {
              if (m_variable_name_object_hash.containsKey(variable_name)) {
                System.out.println("  Hash table now contains object.");
              } else { 
                System.out.println("  Hash table does not contain object.");
              }
            }

            if (m_variable_name_object_hash.isEmpty()) {
              System.err.println("  How can the hashtable be empty after inserting something?");
            } 
          } else {
            if (m_debug_lex)
              System.err.println("  Already in Hash.");
          }

          return new Symbol(sym.VARIABLE, variable_name);
          }

.         { System.err.println("Illegal character: " + yytext() ); }