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annotate src/luan/LuanException.java @ 1283:503bde9a7c80

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add luan.require() and table.call()
author Franklin Schmidt <fschmidt@gmail.com>
date Fri, 21 Dec 2018 09:12:09 -0700
parents 2531942abaf3
children f41919741100
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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.io.PrintStream;
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6 import java.util.List;
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7 import java.util.ArrayList;
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2df768b926aa start Luan
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10 public final class LuanException extends Exception implements LuanCloneable {
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11 private LuanTable table;
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12
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13 public LuanException(String msg,Throwable cause) {
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14 super(msg,cause);
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15 }
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16
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17 public LuanException(String msg) {
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18 super(msg);
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19 }
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20
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21 public LuanException(Throwable cause) {
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22 super(cause);
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23 }
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24
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25 @Override public LuanException shallowClone() {
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26 return new LuanException(getMessage(),getCause());
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27 }
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28
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29 @Override public void deepenClone(LuanCloneable dc,LuanCloner cloner) {
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30 LuanException clone = (LuanException)dc;
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31 clone.table = (LuanTable)cloner.clone(table);
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32 }
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33
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34 public LuanTable table(LuanState luan) {
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35 if( table==null ) {
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36 try {
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37 LuanTable Boot = (LuanTable)luan.require("luan:Boot.luan");
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38 table = (LuanTable)Boot.call( "new_error_table", this );
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39 } catch(LuanException e) {
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40 throw new RuntimeException(e);
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41 }
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42 }
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43 return table;
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44 }
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45
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46 public void throwThis() throws LuanException {
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47 throw this;
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48 }
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49
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50 public String getJavaStackTraceString() {
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51 return getJavaStackTraceString(this);
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52 }
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53
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54 private static String getJavaStackTraceString(Throwable th) {
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55 StringWriter sw = new StringWriter();
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56 th.printStackTrace(new PrintWriter(sw));
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57 return sw.toString();
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58 }
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59
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60 public static List<StackTraceElement> justLuan(StackTraceElement[] orig) {
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61 List<StackTraceElement> list = new ArrayList<StackTraceElement>();
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62 for( int i=0; i<orig.length; i++ ) {
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63 StackTraceElement ste = orig[i];
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64 if( !ste.getClassName().startsWith("luan.impl.EXP") )
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65 continue;
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66 list.add(ste);
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67 if( !ste.getMethodName().equals("doCall") )
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68 i++;
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69 }
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70 return list;
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71 }
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72
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73 public static String toString(StackTraceElement ste) {
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74 StringBuilder sb = new StringBuilder();
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75 sb.append( ste.getFileName() ).append( " line " ).append( ste.getLineNumber() );
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76 String method = ste.getMethodName();
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77 if( !method.equals("doCall") )
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78 sb.append( " in function '" ).append( method.substring(1) ).append( "'" );
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79 return sb.toString();
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80 }
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81
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82 private StringBuilder luanStackTrace() {
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83 StringBuilder sb = new StringBuilder();
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84 sb.append( getMessage() );
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85 for( StackTraceElement ste : justLuan(getStackTrace()) ) {
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86 sb.append( "\n\t" ).append( toString(ste) );
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87 }
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88 return sb;
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89 }
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90
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91 public String getLuanStackTraceString() {
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92 StringBuilder sb = luanStackTrace();
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93 Throwable cause = getCause();
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94 if( cause != null )
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95 sb.append( "\nCaused by: " ).append( getJavaStackTraceString(cause) );
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96 return sb.toString();
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97 }
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98
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99 public static String currentSource() {
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100 LuanException ex = new LuanException("currentSource");
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101 List<StackTraceElement> st = ex.justLuan(ex.getStackTrace());
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102 return st.isEmpty() ? null : st.get(0).getFileName();
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103 }
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104
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105 @Override public void printStackTrace(PrintStream s) {
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106 s.print("Luan: ");
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107 s.println(luanStackTrace());
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108 s.print("Caused by: ");
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109 super.printStackTrace(s);
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110 }
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111
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112 @Override public void printStackTrace(PrintWriter s) {
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113 s.print("Luan: ");
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114 s.println(luanStackTrace());
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115 s.print("Caused by: ");
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116 super.printStackTrace(s);
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117 }
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118
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119 }