Method expandMacro

src/org/apache/pig/parser/QueryParserDriver.java:266–295

(Tree ast)

    }

    Tree expandMacro(Tree ast) throws ParserException {
        LOG.debug("Original macro AST:\n" + ast.toStringTree() + "\n");

        // first insert the import files
        while (expandImport(ast))
            ;

        LOG.debug("macro AST after import:\n" + ast.toStringTree() + "\n");

        List<CommonTree> macroNodes = new ArrayList<CommonTree>();
        List<CommonTree> inlineNodes = new ArrayList<CommonTree>();

        // find all macro def/inline nodes
        traverse(ast, macroNodes, inlineNodes);

        Map<String, PigMacro> seen = new HashMap<String, PigMacro>();
        List<PigMacro> macroDefs = new ArrayList<PigMacro>();

        // gether all the def nodes
        for (CommonTree t : macroNodes) {
            macroDefs.add(makeMacroDef(t, seen));
        }

        // inline macros
        inlineMacro(inlineNodes, macroDefs);

        LOG.debug("Resulting macro AST:\n" + ast.toStringTree() + "\n");

        return ast;
    }

    private void inlineMacro(List<CommonTree> inlineNodes,
            List<PigMacro> macroDefs) throws ParserException {