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annotate core/src/luan/LuanException.java @ 628:6510de302f95

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add "which" command
author Franklin Schmidt <fschmidt@gmail.com>
date Mon, 18 Jan 2016 06:42:50 -0700
parents 60c549d43988
children 859c0dedc8b6
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1 package luan;
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3 import java.io.StringWriter;
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4 import java.io.PrintWriter;
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7 public final class LuanException extends Exception implements DeepCloneable {
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8 private LuanTable table = new LuanTable();
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10 private LuanException(String msg,Throwable cause) {
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11 super(msg,cause);
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12 }
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14 public LuanException(LuanState luan,Object msg) throws LuanException {
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15 this( luan.toString(msg), msg instanceof Throwable ? (Throwable)msg : null );
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16 table.rawPut( "java", this );
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17 table.rawPut( "message", msg );
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18 table.rawPut( "message_string", luan.toString(msg) );
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19 for( StackTraceElement ste : luan.stackTrace ) {
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20 LuanTable tbl = new LuanTable();
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21 tbl.rawPut( "source", ste.call.source.name );
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22 tbl.rawPut( "line", ste.call.lineNumber() );
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23 tbl.rawPut( "call_to", ste.fnName );
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24 table.rawPut( table.rawLength() + 1, tbl );
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25 }
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26 LuanTable metatable = new LuanTable();
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27 table.setMetatable(metatable);
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28 try {
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29 table.rawPut( "throw", new LuanJavaFunction(
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30 LuanException.class.getMethod( "throwThis" ), this
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31 ) );
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32 metatable.rawPut( "__to_string", new LuanJavaFunction(
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33 LuanException.class.getMethod( "__to_string", LuanTable.class ), null
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34 ) );
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35 } catch(NoSuchMethodException e) {
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36 throw new RuntimeException(e);
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37 }
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38 }
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40 @Override public LuanException shallowClone() {
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41 return new LuanException(getMessage(),getCause());
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42 }
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43
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44 @Override public void deepenClone(DeepCloneable dc,DeepCloner cloner) {
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45 LuanException clone = (LuanException)dc;
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46 clone.table = (LuanTable)cloner.get(table);
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47 }
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49 public LuanTable table() {
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50 return table;
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51 }
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52
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53 public void throwThis() throws LuanException {
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54 throw this;
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55 }
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56
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57 public String getFullMessage() {
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58 return __to_string(table);
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59 }
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60
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61 public static String __to_string(LuanTable table) {
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62 StringBuilder buf = new StringBuilder();
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64 Object msg = table.rawGet("message");
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65 String msgStr = (String)table.rawGet("message_string");
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66 buf.append( msgStr );
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67
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68 for( int i = table.rawLength(); i>=1; i-- ) {
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69 LuanTable tbl = (LuanTable)table.rawGet(i);
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70 buf.append( "\n\t" ).append( tbl.rawGet("source") ).append( " line " ).append( tbl.rawGet("line") );
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71 Object callTo = tbl.rawGet("call_to");
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72 if( callTo != null )
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73 buf.append( " in call to '" ).append( callTo ).append( "'" );
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74 }
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76 if( msg instanceof Throwable ) {
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77 buf.append( "\nCaused by: " );
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78 Throwable cause = (Throwable)msg;
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79 StringWriter sw = new StringWriter();
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80 cause.printStackTrace(new PrintWriter(sw));
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81 buf.append( sw );
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82 }
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84 return buf.toString();
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85 }
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87 }