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annotate core/src/luan/LuanBit.java @ 459:30544d1a9cbf

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better stack overflow handling
author Franklin Schmidt <fschmidt@gmail.com>
date Wed, 06 May 2015 12:58:06 -0600
parents bbad2d06f728
children b48cfa14ba60
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1 package luan;
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3 import java.util.List;
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4
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6 public final class LuanBit {
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7 public final LuanState luan;
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8 public final LuanElement el;
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10 LuanBit(LuanState luan,LuanElement el) {
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11 this.luan = luan;
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12 this.el = el;
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13 }
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14
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15 public LuanException exception(Object msg) {
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16 return new LuanException(this,msg);
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17 }
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18
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19 public String stackTrace() {
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20 StringBuilder buf = new StringBuilder();
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21 LuanElement el = this.el;
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22 for( int i = luan.stackTrace.size() - 1; i>=0; i-- ) {
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23 StackTraceElement stackTraceElement = luan.stackTrace.get(i);
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24 buf.append( "\n\t" ).append( el.toString(stackTraceElement.fnName) );
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25 el = stackTraceElement.call;
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26 }
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27 return buf.toString();
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28 }
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29
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30 public void dumpStack() {
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31 System.err.println( stackTrace() );
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32 }
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34 public Object call(LuanFunction fn,String fnName,Object[] args) throws LuanException {
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35 List<StackTraceElement> stackTrace = luan.stackTrace;
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36 stackTrace.add( new StackTraceElement(el,fnName) );
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37 try {
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38 return fn.call(luan,args);
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39 } catch(StackOverflowError e) {
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40 throw exception("stack overflow");
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41 } finally {
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42 stackTrace.remove(stackTrace.size()-1);
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43 }
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44 }
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46 public String checkString(Object obj) throws LuanException {
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47 if( obj instanceof String )
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48 return (String)obj;
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49 if( el instanceof LuanSource.Element ) {
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50 LuanSource.Element se = (LuanSource.Element)el;
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51 throw exception( "attempt to use '"+se.text()+"' (a " + Luan.type(obj) + " value) as a string" );
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52 } else {
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53 throw exception( "attempt to use a " + Luan.type(obj) + " as a string" );
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54 }
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55 }
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57 public Number checkNumber(Object obj) throws LuanException {
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58 if( obj instanceof Number )
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59 return (Number)obj;
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60 if( el instanceof LuanSource.Element ) {
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61 LuanSource.Element se = (LuanSource.Element)el;
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62 throw exception( "attempt to perform arithmetic on '"+se.text()+"' (a " + Luan.type(obj) + " value)" );
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63 } else {
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64 throw exception( "attempt to perform arithmetic on a " + Luan.type(obj) + " value" );
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65 }
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66 }
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68 public LuanFunction checkFunction(Object obj) throws LuanException {
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69 if( obj instanceof LuanFunction )
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70 return (LuanFunction)obj;
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71 if( el instanceof LuanSource.Element ) {
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72 LuanSource.Element se = (LuanSource.Element)el;
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73 throw exception( "attempt to call '"+se.text()+"' (a " + Luan.type(obj) + " value)" );
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74 } else {
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75 throw exception( "attempt to call a " + Luan.type(obj) + " value" );
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76 }
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77 }
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78
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79 public Boolean checkBoolean(Object obj) throws LuanException {
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80 if( obj instanceof Boolean )
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81 return (Boolean)obj;
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82 if( el instanceof LuanSource.Element ) {
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83 LuanSource.Element se = (LuanSource.Element)el;
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84 throw exception( "attempt to use '"+se.text()+"' (a " + Luan.type(obj) + " value) as a boolean" );
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85 } else {
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86 throw exception( "attempt to use a " + Luan.type(obj) + " as a boolean" );
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87 }
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88 }
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89
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90 public String toString(Object obj) throws LuanException {
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91 if( obj instanceof LuanTable ) {
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92 LuanTable tbl = (LuanTable)obj;
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93 return tbl.toString(luan);
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94 }
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95 if( obj == null )
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96 return "nil";
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97 if( obj instanceof Number )
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98 return Luan.toString((Number)obj);
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99 if( obj instanceof LuanException ) {
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100 LuanException le = (LuanException)obj;
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101 return le.getFullMessage();
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102 }
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103 if( obj instanceof byte[] )
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104 return "binary: " + Integer.toHexString(obj.hashCode());
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105 return obj.toString();
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106 }
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107
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108 public LuanFunction getHandlerFunction(String op,LuanTable t) throws LuanException {
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109 Object f = t.getHandler(op);
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110 if( f == null )
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111 return null;
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112 return checkFunction(f);
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113 }
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114
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115 public LuanFunction getBinHandler(String op,Object o1,Object o2) throws LuanException {
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116 if( o1 instanceof LuanTable ) {
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117 LuanFunction f1 = getHandlerFunction(op,(LuanTable)o1);
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118 if( f1 != null )
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119 return f1;
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120 }
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121 return o2 instanceof LuanTable ? getHandlerFunction(op,(LuanTable)o2) : null;
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122 }
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123
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124 public boolean isLessThan(Object o1,Object o2) throws LuanException {
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125 if( o1 instanceof Number && o2 instanceof Number ) {
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126 Number n1 = (Number)o1;
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127 Number n2 = (Number)o2;
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128 return n1.doubleValue() < n2.doubleValue();
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129 }
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130 if( o1 instanceof String && o2 instanceof String ) {
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131 String s1 = (String)o1;
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132 String s2 = (String)o2;
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133 return s1.compareTo(s2) < 0;
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134 }
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135 LuanFunction fn = getBinHandler("__lt",o1,o2);
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136 if( fn != null )
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137 return checkBoolean( Luan.first(call(fn,"__lt",new Object[]{o1,o2})) );
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138 throw exception( "attempt to compare " + Luan.type(o1) + " with " + Luan.type(o2) );
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139 }
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140
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141 public Object arithmetic(String op,Object o1,Object o2) throws LuanException {
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142 LuanFunction fn = getBinHandler(op,o1,o2);
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143 if( fn != null )
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144 return Luan.first(call(fn,op,new Object[]{o1,o2}));
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145 String type = !(o1 instanceof Number) ? Luan.type(o1) : Luan.type(o2);
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146 throw exception("attempt to perform arithmetic on a "+type+" value");
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147 }
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148
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149 }