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annotate core/src/luan/LuanException.java @ 484:2e17b54e69d9

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minor
author Franklin Schmidt <fschmidt@gmail.com>
date Mon, 11 May 2015 21:22:25 -0600
parents 5d4a78c93383
children 8dcf9e12446b
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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 LuanException(LuanBit bit,Object msg) throws LuanException {
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15 this( bit.luan.toString(msg), msg instanceof Throwable ? (Throwable)msg : null );
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16 table.rawPut("message",msg);
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17 for( StackTraceElement ste : bit.stackTrace() ) {
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18 LuanTable tbl = new LuanTable();
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19 tbl.rawPut( "source", ste.call.source.name );
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20 tbl.rawPut( "line", ste.call.lineNumber() );
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21 tbl.rawPut( "call_to", ste.fnName );
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22 table.rawPut( table.rawLength() + 1, tbl );
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23 }
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24 LuanTable metatable = new LuanTable();
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25 table.setMetatable(metatable);
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26 try {
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27 table.rawPut( "throw", new LuanJavaFunction(
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28 LuanException.class.getMethod( "throwThis" ), this
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29 ) );
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30 metatable.rawPut( "__to_string", new LuanJavaFunction(
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31 LuanException.class.getMethod( "__to_string", LuanState.class, LuanTable.class ), null
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32 ) );
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33 } catch(NoSuchMethodException e) {
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34 throw new RuntimeException(e);
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35 }
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36 }
2df768b926aa start Luan
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38 @Override public LuanException shallowClone() {
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39 return new LuanException(getMessage(),getCause());
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40 }
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41
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42 @Override public void deepenClone(DeepCloneable dc,DeepCloner cloner) {
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43 LuanException clone = (LuanException)dc;
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44 clone.table = (LuanTable)cloner.get(table);
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45 }
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46
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47 public LuanTable table() {
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48 return table;
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49 }
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50
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51 public void throwThis() throws LuanException {
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52 throw this;
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53 }
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54
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55 public String getFullMessage(LuanState luan) {
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56 try {
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57 return __to_string(luan,table);
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58 } catch(LuanException e) {
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59 throw new RuntimeException(e);
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60 }
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61 }
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62
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63 public static String __to_string(LuanState luan,LuanTable table) throws LuanException {
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64 StringBuilder buf = new StringBuilder();
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65
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66 Object msg = table.rawGet("message");
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67 buf.append( luan.toString(msg) );
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68
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69 for( int i = table.rawLength(); i>=1; i-- ) {
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70 LuanTable tbl = (LuanTable)table.rawGet(i);
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71 buf.append( "\n\t" ).append( tbl.rawGet("source") ).append( " line " ).append( tbl.rawGet("line") );
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72 Object callTo = tbl.rawGet("call_to");
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73 if( callTo != null )
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74 buf.append( " in call to '" ).append( callTo ).append( "'" );
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75 }
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76
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77 if( msg instanceof Throwable ) {
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78 buf.append( "\nCaused by: " );
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79 Throwable cause = (Throwable)msg;
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80 StringWriter sw = new StringWriter();
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81 cause.printStackTrace(new PrintWriter(sw));
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82 buf.append( sw );
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83 }
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85 return buf.toString();
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86 }
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88 }