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annotate src/luan/LuanState.java @ 59:5c9cadd0acce

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move standard calls from CmdLine to LuanState git-svn-id: https://luan-java.googlecode.com/svn/trunk@60 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Mon, 07 Jan 2013 03:36:28 +0000
parents 8ede219cd111
children f7e17cfb35f9
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1 package luan;
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2
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3 import java.io.InputStream;
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4 import java.io.PrintStream;
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5 import java.util.List;
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6 import java.util.ArrayList;
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7 import luan.interp.LuanCompiler;
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8 import luan.lib.BasicLib;
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9 import luan.lib.JavaLib;
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10 import luan.lib.MathLib;
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11 import luan.lib.StringLib;
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12 import luan.lib.TableLib;
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13 import luan.lib.HtmlLib;
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16 public abstract class LuanState {
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18 public static LuanState newStandard() {
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19 LuanState luan = LuanCompiler.newLuanState();
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20 BasicLib.register(luan);
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21 JavaLib.register(luan);
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22 MathLib.register(luan);
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23 StringLib.register(luan);
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24 TableLib.register(luan);
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25 HtmlLib.register(luan);
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26 return luan;
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27 }
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29 public Object[] eval(String cmd,String sourceName) throws LuanException {
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30 LuanFunction fn = BasicLib.load(this,cmd,sourceName);
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31 return call(fn,null,null);
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32 }
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36 private final LuanTable global = new LuanTable();
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37 private final List<MetatableGetter> mtGetters = new ArrayList<MetatableGetter>();
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38 final List<StackTraceElement> stackTrace = new ArrayList<StackTraceElement>();
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40 public InputStream in = System.in;
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41 public PrintStream out = System.out;
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42 public PrintStream err = System.err;
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43
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44 public final LuanTable global() {
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45 return global;
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46 }
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47
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48 public final LuanTable getMetatable(Object obj) {
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49 if( obj instanceof LuanTable ) {
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50 LuanTable table = (LuanTable)obj;
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51 return table.getMetatable();
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52 }
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53 for( MetatableGetter mg : mtGetters ) {
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54 LuanTable table = mg.getMetatable(obj);
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55 if( table != null )
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56 return table;
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57 }
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58 return null;
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59 }
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60
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61 public final void addMetatableGetter(MetatableGetter mg) {
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62 mtGetters.add(mg);
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63 }
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64
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65 public Object[] call(LuanFunction fn,LuanElement calledFrom,String fnName,Object... args) throws LuanException {
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66 stackTrace.add( new StackTraceElement(calledFrom,fnName) );
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67 try {
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68 return fn.call(this,args);
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69 } finally {
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70 stackTrace.remove(stackTrace.size()-1);
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71 }
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72 }
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73
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74 public final String checkString(LuanElement el,Object obj) throws LuanException {
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75 String s = Luan.asString(obj);
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76 if( s == null )
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77 throw new LuanException( this, el, "attempt to use a " + Luan.type(obj) + " as a string" );
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78 return s;
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79 }
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81 public final Number checkNumber(LuanElement el,Object obj) throws LuanException {
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82 Number n = Luan.toNumber(obj);
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83 if( n == null )
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84 throw new LuanException( this, el, "attempt to perform arithmetic on a " + Luan.type(obj) + " value" );
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85 return n;
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86 }
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87
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88 public final LuanFunction checkFunction(LuanElement el,Object obj) throws LuanException {
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89 if( obj instanceof LuanFunction )
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90 return (LuanFunction)obj;
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91 throw new LuanException( this, el, "attempt to call a " + Luan.type(obj) + " value" );
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92 }
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93
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94 public final String toString(LuanElement el,Object obj) throws LuanException {
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95 LuanFunction fn = getHandlerFunction(el,"__tostring",obj);
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96 if( fn != null )
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97 return checkString( el, Luan.first( call(fn,el,"__tostring",obj) ) );
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents:
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98 if( obj == null )
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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99 return "nil";
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents:
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100 if( obj instanceof Number )
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents:
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101 return Luan.toString((Number)obj);
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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102 if( obj instanceof LuanException ) {
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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103 LuanException le = (LuanException)obj;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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104 return le.getMessage();
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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105 }
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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106 return obj.toString();
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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107 }
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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108
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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109 public final LuanFunction getHandlerFunction(LuanElement el,String op,Object obj) throws LuanException {
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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110 Object f = getHandler(op,obj);
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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111 if( f == null )
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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112 return null;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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113 return checkFunction(el,f);
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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114 }
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115
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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116 public final Object getHandler(String op,Object obj) {
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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117 LuanTable t = getMetatable(obj);
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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118 return t==null ? null : t.get(op);
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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119 }
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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120
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121
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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122 public final LuanFunction getBinHandler(LuanElement el,String op,Object o1,Object o2) throws LuanException {
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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123 LuanFunction f1 = getHandlerFunction(el,op,o1);
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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124 if( f1 != null )
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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125 return f1;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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126 return getHandlerFunction(el,op,o2);
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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127 }
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128
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129 public final boolean isLessThan(LuanElement el,Object o1,Object o2) throws LuanException {
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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130 if( o1 instanceof Number && o2 instanceof Number ) {
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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131 Number n1 = (Number)o1;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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132 Number n2 = (Number)o2;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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133 return n1.doubleValue() < n2.doubleValue();
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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134 }
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents:
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135 if( o1 instanceof String && o2 instanceof String ) {
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents:
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136 String s1 = (String)o1;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents:
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137 String s2 = (String)o2;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents:
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138 return s1.compareTo(s2) < 0;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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139 }
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents:
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140 LuanFunction fn = getBinHandler(el,"__lt",o1,o2);
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents:
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141 if( fn != null )
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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142 return Luan.toBoolean( Luan.first(call(fn,el,"__lt",o1,o2)) );
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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143 throw new LuanException( this, el, "attempt to compare " + Luan.type(o1) + " with " + Luan.type(o2) );
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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144 }
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents:
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145 }