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annotate core/src/luan/LuanBit.java @ 572:f1601a4ce1aa

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fix stack when calling meta-methods
author Franklin Schmidt <fschmidt@gmail.com>
date Sun, 12 Jul 2015 21:34:23 -0600
parents e3b0846dc2ef
children 6cc2f047019b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 package luan;
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3 import java.util.List;
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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) throws LuanException {
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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 StackTraceElement[] stackTrace() {
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20 List<StackTraceElement> stackTrace = luan.stackTrace;
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21 if( el != null )
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22 stackTrace.add(new StackTraceElement(el,null));
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23 StackTraceElement[] rtn = stackTrace.toArray(new StackTraceElement[0]);
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24 if( el != null )
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25 stackTrace.remove(stackTrace.size()-1);
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26 return rtn;
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27 }
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29 public void dumpStack() {
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30 System.err.println( stackTrace() );
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31 }
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32
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33 public Object call(LuanFunction fn,String fnName,Object[] args) throws LuanException {
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34 if( el == null )
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35 return fn.call(luan,args);
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36 List<StackTraceElement> stackTrace = luan.stackTrace;
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37 stackTrace.add( new StackTraceElement(el,fnName) );
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38 try {
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39 return fn.call(luan,args);
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40 } catch(StackOverflowError e) {
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41 throw exception("stack overflow");
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42 } finally {
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43 stackTrace.remove(stackTrace.size()-1);
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44 }
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45 }
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47 public String checkString(Object obj) throws LuanException {
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48 if( obj instanceof String )
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49 return (String)obj;
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50 if( el != null ) {
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51 throw exception( "attempt to use '"+el.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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56
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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 != null ) {
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61 throw exception( "attempt to perform arithmetic on '"+el.text()+"' (a " + Luan.type(obj) + " value)" );
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62 } else {
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63 throw exception( "attempt to perform arithmetic on a " + Luan.type(obj) + " value" );
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64 }
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65 }
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66
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67 public LuanFunction checkFunction(Object obj) throws LuanException {
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68 if( obj instanceof LuanFunction )
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69 return (LuanFunction)obj;
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70 if( el != null ) {
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71 throw exception( "attempt to call '"+el.text()+"' (a " + Luan.type(obj) + " value)" );
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72 } else {
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73 throw exception( "attempt to call a " + Luan.type(obj) + " value" );
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74 }
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75 }
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77 public Boolean checkBoolean(Object obj) throws LuanException {
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78 if( obj instanceof Boolean )
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79 return (Boolean)obj;
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80 if( el != null ) {
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81 throw exception( "attempt to use '"+el.text()+"' (a " + Luan.type(obj) + " value) as a boolean" );
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82 } else {
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83 throw exception( "attempt to use a " + Luan.type(obj) + " as a boolean" );
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84 }
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85 }
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86
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87 public LuanFunction getHandlerFunction(String op,LuanTable t) throws LuanException {
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88 Object f = t.getHandler(op);
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89 if( f == null )
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90 return null;
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91 return checkFunction(f);
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92 }
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94 public LuanFunction getBinHandler(String op,Object o1,Object o2) throws LuanException {
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95 if( o1 instanceof LuanTable ) {
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96 LuanFunction f1 = getHandlerFunction(op,(LuanTable)o1);
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97 if( f1 != null )
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98 return f1;
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99 }
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100 return o2 instanceof LuanTable ? getHandlerFunction(op,(LuanTable)o2) : null;
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101 }
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103 public boolean isLessThan(Object o1,Object o2) throws LuanException {
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104 if( o1 instanceof Number && o2 instanceof Number ) {
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105 Number n1 = (Number)o1;
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106 Number n2 = (Number)o2;
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107 return n1.doubleValue() < n2.doubleValue();
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108 }
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109 if( o1 instanceof String && o2 instanceof String ) {
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110 String s1 = (String)o1;
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111 String s2 = (String)o2;
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112 return s1.compareTo(s2) < 0;
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113 }
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114 LuanFunction fn = getBinHandler("__lt",o1,o2);
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115 if( fn != null )
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116 return checkBoolean( Luan.first(call(fn,"__lt",new Object[]{o1,o2})) );
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117 throw exception( "attempt to compare " + Luan.type(o1) + " with " + Luan.type(o2) );
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118 }
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119
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120 public Object arithmetic(String op,Object o1,Object o2) throws LuanException {
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121 LuanFunction fn = getBinHandler(op,o1,o2);
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122 if( fn != null )
112
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123 return Luan.first(call(fn,op,new Object[]{o1,o2}));
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124 String type = !(o1 instanceof Number) ? Luan.type(o1) : Luan.type(o2);
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125 throw exception("attempt to perform arithmetic on a "+type+" value");
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126 }
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127
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128 public String toString(Object obj) throws LuanException {
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129 if( obj instanceof LuanTable ) {
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130 LuanTable tbl = (LuanTable)obj;
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131 return tbl.toString(this);
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132 }
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133 if( obj == null )
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134 return "nil";
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135 if( obj instanceof Number )
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136 return Luan.toString((Number)obj);
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137 if( obj instanceof byte[] )
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138 return "binary: " + Integer.toHexString(obj.hashCode());
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139 return obj.toString();
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140 }
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141
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142 }