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annotate core/src/luan/LuanException.java @ 682:0c334975d526

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finish stack trace
author Franklin Schmidt <fschmidt@gmail.com>
date Thu, 14 Apr 2016 21:41:40 -0600
parents cdc70de628b5
children 67dd1449e354
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2df768b926aa start Luan
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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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5 import java.util.List;
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6 import java.util.ArrayList;
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2df768b926aa start Luan
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8
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9 public final class LuanException extends Exception {
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10
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11 public LuanException(String msg,Throwable cause) {
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12 super(msg,cause);
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13 }
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15 public LuanException(String msg) {
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16 super(msg);
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17 }
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18
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19 public LuanException(Throwable cause) {
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20 super(cause);
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21 }
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22
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23 public LuanTable table() {
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24 LuanTable table = new LuanTable();
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25 table.rawPut( "java", this );
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26 /*
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27 for( StackTraceElement ste : luan.stackTrace ) {
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28 LuanTable tbl = new LuanTable();
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29 tbl.rawPut( "source", ste.call.source.name );
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30 tbl.rawPut( "line", ste.call.lineNumber() );
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31 tbl.rawPut( "call_to", ste.fnName );
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32 table.rawPut( table.rawLength() + 1, tbl );
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33 }
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34 */
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35 LuanTable metatable = new LuanTable();
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36 table.setMetatable(metatable);
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37 try {
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38 table.rawPut( "get_message", new LuanJavaFunction(
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39 LuanException.class.getMethod( "getMessage" ), this
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40 ) );
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41 table.rawPut( "throw", new LuanJavaFunction(
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42 LuanException.class.getMethod( "throwThis" ), this
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43 ) );
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44 table.rawPut( "get_java_stack_trace_string", new LuanJavaFunction(
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45 LuanException.class.getMethod( "getJavaStackTraceString" ), this
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46 ) );
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47 metatable.rawPut( "__to_string", new LuanJavaFunction(
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48 LuanException.class.getMethod( "getFullMessage" ), this
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49 ) );
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50 } catch(NoSuchMethodException e) {
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51 throw new RuntimeException(e);
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52 }
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53 return table;
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54 }
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55
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56 public void throwThis() throws LuanException {
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57 throw this;
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58 }
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59
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60 public String getFullMessage() {
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61 return getLuanStackTraceString();
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62 /*
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63 StringBuilder buf = new StringBuilder();
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64
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65 Object msg = table.rawGet("message");
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66 String msgStr = (String)table.rawGet("message_string");
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67 buf.append( msgStr );
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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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84
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85 return buf.toString();
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86 */
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87 }
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88
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89 public String getJavaStackTraceString() {
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90 return getJavaStackTraceString(this);
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91 }
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92
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93 private static String getJavaStackTraceString(Throwable th) {
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94 StringWriter sw = new StringWriter();
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95 th.printStackTrace(new PrintWriter(sw));
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96 return sw.toString();
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97 }
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98
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99 private List<StackTraceElement> justLuan() {
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100 List<StackTraceElement> list = new ArrayList<StackTraceElement>();
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101 StackTraceElement[] orig = getStackTrace();
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102 for( int i=0; i<orig.length; i++ ) {
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103 StackTraceElement ste = orig[i];
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104 if( !ste.getClassName().startsWith("luan.impl.EXP") )
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105 continue;
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106 list.add(ste);
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107 if( !ste.getMethodName().equals("doCall") )
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108 i++;
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109 }
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110 return list;
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111 }
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112
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113 public String getLuanStackTraceString() {
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114 StringBuilder sb = new StringBuilder();
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115 sb.append( getMessage() );
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116 for( StackTraceElement ste : justLuan() ) {
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117 sb.append( "\n\t" ).append( ste.getFileName() ).append( " line " ).append( ste.getLineNumber() );
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118 String method = ste.getMethodName();
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119 if( !method.equals("doCall") )
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120 sb.append( " in function '" ).append( method.substring(1) ).append( "'" );
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121 }
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122 Throwable cause = getCause();
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123 if( cause != null )
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124 sb.append( "\nCaused by: " ).append( getJavaStackTraceString(cause) );
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125 return sb.toString();
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126 }
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127
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128 }