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annotate core/src/luan/Luan.java @ 647:8e8c30b72e9b

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move methods from LuanState to Luan
author Franklin Schmidt <fschmidt@gmail.com>
date Tue, 29 Mar 2016 20:39:14 -0600
parents 6cc2f047019b
children d3e5414bdf4c
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2df768b926aa start Luan
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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diff changeset
1 package luan;
2df768b926aa start Luan
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2
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4fe6c9fed486 add html processing
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3 import java.util.List;
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ebe9db183eb7 rename *Lib.java to *Luan.java
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4 import luan.modules.BasicLuan;
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b585d0915621 remove CmdLine.java and move code to Luan.java
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5
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2df768b926aa start Luan
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6
66
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diff changeset
7 public final class Luan {
1
2df768b926aa start Luan
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8
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9 public static void main(String[] args) throws LuanException {
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8f1be9704726 change LuanState.newStandard() to newInstance() which doesn't preload anything
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10 LuanState luan = LuanState.newInstance();
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11 LuanFunction standalone = (LuanFunction)BasicLuan.load_file(luan,"classpath:luan/cmd_line.luan",null);
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12 standalone.call(luan,args);
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13 }
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14
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15 public static Object first(Object obj) {
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16 if( !(obj instanceof Object[]) )
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17 return obj;
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18 Object[] a = (Object[])obj;
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19 return a.length==0 ? null : a[0];
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20 }
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21
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22 public static Object[] array(Object obj) {
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23 return obj instanceof Object[] ? (Object[])obj : new Object[]{obj};
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24 }
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2df768b926aa start Luan
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26 public static String type(Object obj) {
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27 if( obj == null )
105
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28 return "nil";
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29 if( obj instanceof String )
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30 return "string";
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31 if( obj instanceof Boolean )
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32 return "boolean";
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33 if( obj instanceof Number )
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34 return "number";
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35 if( obj instanceof LuanTable )
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36 return "table";
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37 if( obj instanceof LuanFunction )
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38 return "function";
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39 if( obj instanceof byte[] )
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40 return "binary";
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41 return "java";
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42 }
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43
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44 public static String toString(Number n) {
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45 if( n instanceof Integer )
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46 return n.toString();
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47 int i = n.intValue();
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48 if( i == n.doubleValue() )
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49 return Integer.toString(i);
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50 String s = n.toString();
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51 int iE = s.indexOf('E');
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52 String ending = null;
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53 if( iE != -1 ) {
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54 ending = s.substring(iE);
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55 s = s.substring(0,iE);
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56 }
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57 if( s.endsWith(".0") )
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58 s = s.substring(0,s.length()-2);
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59 if( ending != null )
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60 s += ending;
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61 return s;
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62 }
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63
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64 public static Integer asInteger(Object obj) {
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65 if( obj instanceof Integer )
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66 return (Integer)obj;
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67 if( !(obj instanceof Number) )
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68 return null;
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69 Number n = (Number)obj;
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70 int i = n.intValue();
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71 return i==n.doubleValue() ? Integer.valueOf(i) : null;
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72 }
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73
88
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74 public static String stringEncode(String s) {
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75 s = s.replace("\\","\\\\");
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76 s = s.replace("\u0007","\\a");
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77 s = s.replace("\b","\\b");
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78 s = s.replace("\f","\\f");
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79 s = s.replace("\n","\\n");
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80 s = s.replace("\r","\\r");
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81 s = s.replace("\t","\\t");
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82 s = s.replace("\u000b","\\v");
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83 s = s.replace("\"","\\\"");
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84 s = s.replace("\'","\\'");
88
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85 return s;
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86 }
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87
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88
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89 // from LuanState
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90
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91 public static Boolean checkBoolean(Object obj) throws LuanException {
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92 if( obj instanceof Boolean )
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93 return (Boolean)obj;
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94 throw new LuanException("attempt to use a " + Luan.type(obj) + " value as a boolean" );
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95 }
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96
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97 public static String checkString(Object obj) throws LuanException {
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98 if( obj instanceof String )
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99 return (String)obj;
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100 throw new LuanException("attempt to use a " + Luan.type(obj) + " value as a string" );
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101 }
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102
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103 public static LuanFunction checkFunction(Object obj) throws LuanException {
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104 if( obj instanceof LuanFunction )
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105 return (LuanFunction)obj;
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106 throw new LuanException("attempt to call a " + Luan.type(obj) + " value" );
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107 }
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108
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109 public static boolean isLessThan(LuanState luan,Object o1,Object o2) throws LuanException {
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110 if( o1 instanceof Number && o2 instanceof Number ) {
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111 Number n1 = (Number)o1;
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112 Number n2 = (Number)o2;
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113 return n1.doubleValue() < n2.doubleValue();
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114 }
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115 if( o1 instanceof String && o2 instanceof String ) {
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116 String s1 = (String)o1;
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117 String s2 = (String)o2;
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118 return s1.compareTo(s2) < 0;
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119 }
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120 LuanFunction fn = getBinHandler("__lt",o1,o2);
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121 if( fn != null )
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122 return checkBoolean( Luan.first(fn.call(luan,new Object[]{o1,o2})) );
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123 throw new LuanException( "attempt to compare " + Luan.type(o1) + " with " + Luan.type(o2) );
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124 }
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125
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126 public static LuanFunction getBinHandler(String op,Object o1,Object o2) throws LuanException {
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127 if( o1 instanceof LuanTable ) {
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128 LuanFunction f1 = getHandlerFunction(op,(LuanTable)o1);
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129 if( f1 != null )
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130 return f1;
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131 }
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132 return o2 instanceof LuanTable ? getHandlerFunction(op,(LuanTable)o2) : null;
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133 }
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134
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135 public static LuanFunction getHandlerFunction(String op,LuanTable t) throws LuanException {
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136 Object f = t.getHandler(op);
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137 if( f == null )
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138 return null;
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139 return checkFunction(f);
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140 }
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141
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142
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143
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144 private Luan() {} // never
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145 }