How to use

Ast

in

net.razorvine.serpent.ast

static
private Map<String, ?> parseDict(String string){
  Parser parser = new Parser();
  Ast ast = parser.parse(string);
  return (Map<String, ?>)ast.getData();
}

/**
 * get the actual data as Java objects.
 * @param dictConverter object to convert dicts to actual instances for a class,
 *   instead of leaving them as dictionaries. Requires the __class__ key to be present
 *   in the dict node. If it returns null, the normal processing is done.
 */
public Object getData(IDictToInstance dictConverter)
{
  ObjectifyVisitor v = new ObjectifyVisitor(dictConverter);
  this.accept(v);
  return v.getObject();
}

/**
 * Parse from a string with the Python literal expression
 */
public Ast parse(String expression)
{
  Ast ast=new Ast();
  if(expression==null || expression.length()==0)
    return ast;
  
  SeekableStringReader sr = new SeekableStringReader(expression);
  if(sr.peek()=='#')
    sr.readUntil('\n');  // skip comment line
  
  try {
    ast.root = parseExpr(sr);
    sr.skipWhitespace();
    if(sr.hasMore())
      throw new ParseException("garbage at end of expression");
    return ast;
  } catch (ParseException x) {
    String faultLocation = extractFaultLocation(sr);
    throw new ParseException(x.getMessage() + " (at position "+sr.bookmark()+"; '"+faultLocation+"')", x);
  }
}
 

@Override
public Object deserializeData(byte[] data) throws IOException {
  Parser p = new Parser();
  Ast ast = p.parse(data);
  IDictToInstance dictConverter = new DictConverter();
  return ast.getData(dictConverter);
}

/**
 * get the actual data as Java objects.
 */
public Object getData()
{
  ObjectifyVisitor v = new ObjectifyVisitor();
  this.accept(v);
  return v.getObject();
}

@Override
public Object deserializeData(byte[] data) throws IOException {
  Parser p = new Parser();
  Ast ast = p.parse(data);
  IDictToInstance dictConverter = new DictConverter();
  return ast.getData(dictConverter);
}