PyTraceback.java

// Copyright (c) Corporation for National Research Initiatives
package org.python.core;

/**
 * A python traceback object.
 */

public class PyTraceback extends PyObject {
    public PyObject tb_next;
    public PyFrame tb_frame;
    public int tb_lineno;

    public PyTraceback(PyFrame frame) {
        tb_frame = frame;
        if (tb_frame != null)
            tb_lineno = tb_frame.getline();
        tb_next = Py.None;
    }

    public PyTraceback(PyTraceback next) {
        tb_next = next;
        if (next != null) {
            tb_frame = next.tb_frame.f_back;
            tb_lineno = tb_frame.getline();
        }
    }

    // filename, lineno, function_name
    // "  File \"%.900s\", line %d, in %s\n"
    private String line() {
        if (tb_frame == null || tb_frame.f_code == null)
            return "  (no code object) at line " + tb_lineno + "\n";
        return "  File \"" + tb_frame.f_code.co_filename + "\", line " + tb_lineno + ", in " + tb_frame.f_code.co_name
                + "\n";
    }

    public void dumpStack(StringBuffer buf) {
        buf.append(line());
        if (tb_next != Py.None && tb_next != this)
            ((PyTraceback) tb_next).dumpStack(buf);
        else if (tb_next == this) {
            buf.append("circularity detected!" + this + tb_next);
        }
    }

    public String dumpStack() {
        StringBuffer buf = new StringBuffer();

        buf.append("Traceback (innermost last):\n");
        dumpStack(buf);

        return buf.toString();
    }

    public String toString() {
        return "<traceback object at " + " " + Py.idstr(this) + ">";
    }
}