Hi
I am currently working on a language translation. So, I have created a
template and the tree grammar. But, the template is not executing. It
is giving a Null Pointer Exception. I have the following grammars:
m.g is the main input grammar from which tree grammar g.g and finally,
I'm creating template t.g as the output.
My Java entry program:
import java.io.*;
import org.antlr.runtime.*;
import org.antlr.runtime.tree.*;
import org.antlr.stringtemplate.*;
public class Main {
public static StringTemplateGroup templates;
public static void main(String[] args) throws Exception {
//Read the template file
String stg = null;
int a = 0;
if ( args.length<=1 )
{
stg = "sal_prog_template.stg";
}
else
{
stg = args[a];
a++;
}
templates = new StringTemplateGroup(new FileReader(stg));
//Parse input and build AST
ANTLRInputStream input = new ANTLRInputStream(System.in);
mLexer lexer = new mLexer(input);
CommonTokenStream tokens = new CommonTokenStream(lexer);
mParser parser = new mParser(tokens);
mParser.program_return r1 = parser.program();
CommonTree tree1 = (CommonTree)r1.getTree();
if (r1 != null)
System.out.println(tree1.toStringTree());
//Build the tree grammar g
CommonTreeNodeStream nodes = new CommonTreeNodeStream(tree1);
nodes.setTokenStream(tokens);
g grammar = new g(nodes);
g.program_return r2 = grammar.program();
CommonTree tree2 = (CommonTree)r2.getTree();
if (r2 != null)
System.out.println(tree2.toStringTree());
//Build the template
CommonTreeNodeStream nodes2 = new CommonTreeNodeStream(tree2);
nodes2.setTokenStream(tokens);
t grammar2 = new t(nodes2);
grammar2.setTemplateLib(templates);
t.program_return r3 = grammar2.program();
StringTemplate output = (StringTemplate)r3.getTemplate();
System.out.println(output.toString());
}
}
The error is coming at the line:
StringTemplate output = (StringTemplate)r3.getTemplate();
System.out.println(output.toString());
Please help to me to solve the error.
Thanks a lot.
Swathy
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