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package com.jetbrains.python.debugger.pydev;
import com.intellij.openapi.util.text.StringUtil;
import com.jetbrains.python.debugger.*;
import com.thoughtworks.xstream.io.naming.NoNameCoder;
import com.thoughtworks.xstream.io.xml.XppReader;
import org.jetbrains.annotations.NotNull;
import org.xmlpull.mxp1.MXParser;
import java.io.StringReader;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.util.LinkedList;
import java.util.List;
public class ProtocolParser {
private ProtocolParser() {
}
public static PySignature parseCallSignature(String payload) throws PyDebuggerException {
final XppReader reader = openReader(payload, true);
reader.moveDown();
if (!"call_signature".equals(reader.getNodeName())) {
throw new PyDebuggerException("Expected <call_signature>, found " + reader.getNodeName());
}
final String file = readString(reader, "file", "");
final String name = readString(reader, "name", "");
PySignature signature = new PySignature(file, name);
while (reader.hasMoreChildren()) {
reader.moveDown();
if (!"arg".equals(reader.getNodeName())) {
throw new PyDebuggerException("Expected <arg>, found " + reader.getNodeName());
}
signature.addArgument(readString(reader, "name", ""), readString(reader, "type", ""));
reader.moveUp();
}
return signature;
}
public static String parseSourceContent(String payload) throws PyDebuggerException {
return payload;
}
public static String decode(final String value) throws PyDebuggerException {
try {
return URLDecoder.decode(value, "UTF-8");
}
catch (UnsupportedEncodingException e) {
throw new PyDebuggerException("Unable to decode: " + value + ", reason: " + e.getMessage());
}
}
public static String encodeExpression(final String expression) {
return StringUtil.replace(expression, "\n", "@LINE@");
}
public static PyIo parseIo(final String text) throws PyDebuggerException {
final XppReader reader = openReader(text, true);
reader.moveDown();
if (!"io".equals(reader.getNodeName())) {
throw new PyDebuggerException("Expected <io>, found " + reader.getNodeName());
}
final String s = readString(reader, "s", "");
final int ctx = readInt(reader, "ctx", 1);
return new PyIo(s, ctx);
}
@NotNull
public static PyThreadInfo parseThread(final String text, final PyPositionConverter positionConverter) throws PyDebuggerException {
final XppReader reader = openReader(text, true);
reader.moveDown();
if (!"thread".equals(reader.getNodeName())) {
throw new PyDebuggerException("Expected <thread>, found " + reader.getNodeName());
}
final String id = readString(reader, "id", null);
final String name = readString(reader, "name", "");
final int stopReason = readInt(reader, "stop_reason", 0);
String message = readString(reader, "message", "None");
if ("None".equals(message)) {
message = null;
}
final List<PyStackFrameInfo> frames = new LinkedList<PyStackFrameInfo>();
while (reader.hasMoreChildren()) {
reader.moveDown();
frames.add(parseFrame(reader, id, positionConverter));
reader.moveUp();
}
return new PyThreadInfo(id, name, frames, stopReason, message);
}
@NotNull
public static String getThreadId(@NotNull String payload) {
return payload.split("\t")[0];
}
private static PyStackFrameInfo parseFrame(final XppReader reader, final String threadId, final PyPositionConverter positionConverter)
throws PyDebuggerException {
if (!"frame".equals(reader.getNodeName())) {
throw new PyDebuggerException("Expected <frame>, found " + reader.getNodeName());
}
final String id = readString(reader, "id", null);
final String name = readString(reader, "name", null);
final String file = readString(reader, "file", null);
final int line = readInt(reader, "line", 0);
return new PyStackFrameInfo(threadId, id, name, positionConverter.create(file, line));
}
@NotNull
public static PyDebugValue parseValue(final String text, final PyFrameAccessor frameAccessor) throws PyDebuggerException {
final XppReader reader = openReader(text, true);
reader.moveDown();
return parseValue(reader, frameAccessor);
}
@NotNull
public static List<PyDebugValue> parseReferrers(final String text, final PyFrameAccessor frameAccessor) throws PyDebuggerException {
final List<PyDebugValue> values = new LinkedList<PyDebugValue>();
final XppReader reader = openReader(text, false);
while (reader.hasMoreChildren()) {
reader.moveDown();
if (reader.getNodeName().equals("var")) {
PyDebugValue value = parseValue(reader, frameAccessor);
value.setId(readString(reader, "id", null));
values.add(value);
}
else if (reader.getNodeName().equals("for")) {
//TODO
}
else {
throw new PyDebuggerException("Expected <var> or <for>, found " + reader.getNodeName());
}
reader.moveUp();
}
return values;
}
@NotNull
public static List<PyDebugValue> parseValues(final String text, final PyFrameAccessor frameAccessor) throws PyDebuggerException {
final List<PyDebugValue> values = new LinkedList<PyDebugValue>();
final XppReader reader = openReader(text, false);
while (reader.hasMoreChildren()) {
reader.moveDown();
values.add(parseValue(reader, frameAccessor));
reader.moveUp();
}
return values;
}
private static PyDebugValue parseValue(final XppReader reader, PyFrameAccessor frameAccessor) throws PyDebuggerException {
if (!"var".equals(reader.getNodeName())) {
throw new PyDebuggerException("Expected <var>, found " + reader.getNodeName());
}
final String name = readString(reader, "name", null);
final String type = readString(reader, "type", null);
String value = readString(reader, "value", null);
final String isContainer = readString(reader, "isContainer", "");
final String isErrorOnEval = readString(reader, "isErrorOnEval", "");
if (value.startsWith(type + ": ")) { // drop unneeded prefix
value = value.substring(type.length() + 2);
}
return new PyDebugValue(name, type, value, "True".equals(isContainer), "True".equals(isErrorOnEval), frameAccessor);
}
private static XppReader openReader(final String text, final boolean checkForContent) throws PyDebuggerException {
final XppReader reader = new XppReader(new StringReader(text), new MXParser(), new NoNameCoder());
if (checkForContent && !reader.hasMoreChildren()) {
throw new PyDebuggerException("Empty frame: " + text);
}
return reader;
}
private static String readString(final XppReader reader, final String name, final String fallback) throws PyDebuggerException {
final String value;
try {
value = read(reader, name);
}
catch (PyDebuggerException e) {
if (fallback != null) {
return fallback;
}
else {
throw e;
}
}
return decode(value);
}
private static int readInt(final XppReader reader, final String name, final Integer fallback) throws PyDebuggerException {
final String value;
try {
value = read(reader, name);
}
catch (PyDebuggerException e) {
if (fallback != null) {
return fallback;
}
else {
throw e;
}
}
try {
return Integer.parseInt(value);
}
catch (NumberFormatException e) {
throw new PyDebuggerException("Unable to decode " + value + ": " + e.getMessage());
}
}
private static String read(final XppReader reader, final String name) throws PyDebuggerException {
final String value = reader.getAttribute(name);
if (value == null) {
throw new PyDebuggerException("Attribute not found: " + name);
}
return value;
}
}
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