/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * This file is part of SableCC.                             * * See the file "LICENSE" for copyright information and the  * * terms and conditions for copying, distribution and        * * modification of SableCC.                                  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */package org.sablecc.sablecc;import java.io.*;import java.util.*;public class MacroExpander{  private static final String MACRO = "Macro:";  private static final String lineSeparator = System.getProperty("line.separator");  private Map macros = new TypedTreeMap(                         StringComparator.instance,                         StringCast.instance,                         ListCast.instance);  public MacroExpander(Reader in) throws IOException  {    BufferedReader br = new BufferedReader(in);    while(readInMacro(br))      ;    in.close();  }  private boolean readInMacro(BufferedReader in) throws IOException  {    String line;    while((line = in.readLine()) != null)    {      if(line.startsWith(MACRO))      {        String name = line.substring(MACRO.length());        List macro = new TypedLinkedList(StringCast.instance);        while((line = in.readLine()) != null)        {          if(line.equals("$"))          {            macros.put(name, macro);            return true;          }          macro.add(line);        }        macros.put(name, macro);        return false;      }    }    return false;  }  public String toString()  {    return this.getClass().getName() + macros;  }  public void apply(BufferedWriter out, String macroName) throws IOException  {    apply(out, macroName, null);  }  public void apply(BufferedWriter out, String macroName, String[] arguments) throws IOException  {    List macro = (List) macros.get(macroName);    for(ListIterator li = macro.listIterator(); li.hasNext();)    {      if(li.nextIndex() != 0)      {        out.newLine();      }      String line = (String) li.next();      char c;      for(int i = 0; i < line.length(); i++)      {        if((c = line.charAt(i)) == '$')        {          StringBuffer index = new StringBuffer();          while((c = line.charAt(++i)) != '$')          {            index.append(c);          }          if(index.length() == 0)          {            out.write('$');          }          else          {            out.write(arguments[Integer.parseInt(index.toString())]);          }        }        else        {          out.write(c);        }      }    }  }}