Mercurial Hosting > luan
annotate core/src/luan/Luan.java @ 261:715c4a6e1169
simplify Io.stdin
git-svn-id: https://luan-java.googlecode.com/svn/trunk@262 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
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date | Tue, 28 Oct 2014 23:36:29 +0000 |
parents | 4dfa86dbca45 |
children | 7ea6dfdf81ba |
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1
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1 package luan; |
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2 |
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3 import luan.modules.BasicLuan; |
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4 |
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5 |
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6 public final class Luan { |
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7 |
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8 public static void main(String[] args) { |
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9 LuanState luan = LuanState.newStandard(); |
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10 try { |
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11 LuanFunction standalone = (LuanFunction)BasicLuan.load_file(luan,"classpath:luan/cmd_line.luan"); |
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12 luan.call(standalone,args); |
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13 } catch(LuanException e) { |
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14 System.err.println(e.getFullMessage()); |
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15 // e.printStackTrace(); |
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16 System.exit(-1); |
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17 } |
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18 } |
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19 |
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20 public static Object first(Object obj) { |
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21 if( !(obj instanceof Object[]) ) |
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22 return obj; |
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23 Object[] a = (Object[])obj; |
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24 return a.length==0 ? null : a[0]; |
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25 } |
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26 |
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27 public static Object[] array(Object obj) { |
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28 return obj instanceof Object[] ? (Object[])obj : new Object[]{obj}; |
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29 } |
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30 |
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31 public static String type(Object obj) { |
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32 if( obj == null ) |
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33 return "nil"; |
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34 if( obj instanceof String ) |
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35 return "string"; |
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36 if( obj instanceof Boolean ) |
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37 return "boolean"; |
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38 if( obj instanceof Number ) |
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39 return "number"; |
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40 if( obj instanceof LuanTable ) |
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41 return "table"; |
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42 if( obj instanceof LuanFunction ) |
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43 return "function"; |
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44 if( obj instanceof byte[] ) |
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45 return "binary"; |
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46 return "userdata"; |
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47 } |
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48 |
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49 public static boolean toBoolean(Object obj) { |
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50 return obj != null && !Boolean.FALSE.equals(obj); |
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51 } |
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52 |
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53 public static String asString(Object obj) { |
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54 if( obj instanceof String ) |
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55 return (String)obj; |
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56 if( obj instanceof Number ) |
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57 return toString((Number)obj); |
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58 return null; |
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59 } |
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60 |
46
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61 public static Number toNumber(Object obj) { |
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62 return toNumber(obj,null); |
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63 } |
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64 |
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65 public static Number toNumber(Object obj,Integer base) { |
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66 if( obj instanceof Number ) |
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67 return (Number)obj; |
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68 if( obj instanceof String ) { |
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69 String s = (String)obj; |
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70 try { |
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71 if( base==null ) |
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72 return Double.valueOf(s); |
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73 else |
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74 return Long.valueOf(s,base); |
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75 } catch(NumberFormatException e) {} |
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76 } |
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77 return null; |
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78 } |
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79 |
46
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80 public static String toString(Number n) { |
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81 if( n instanceof Integer ) |
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82 return n.toString(); |
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83 int i = n.intValue(); |
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84 if( i == n.doubleValue() ) |
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85 return Integer.toString(i); |
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86 String s = n.toString(); |
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87 int iE = s.indexOf('E'); |
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88 String ending = null; |
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89 if( iE != -1 ) { |
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90 ending = s.substring(iE); |
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91 s = s.substring(0,iE); |
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92 } |
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93 if( s.endsWith(".0") ) |
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94 s = s.substring(0,s.length()-2); |
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95 if( ending != null ) |
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96 s += ending; |
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97 return s; |
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98 } |
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99 |
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100 public static Integer asInteger(Object obj) { |
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101 if( obj instanceof Integer ) |
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102 return (Integer)obj; |
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103 if( !(obj instanceof Number) ) |
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104 return null; |
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105 Number n = (Number)obj; |
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106 int i = n.intValue(); |
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107 return i==n.doubleValue() ? Integer.valueOf(i) : null; |
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108 } |
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109 |
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110 public static String toString(Object obj) { |
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111 if( obj == null ) |
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112 return "nil"; |
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113 if( obj instanceof Number ) |
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114 return Luan.toString((Number)obj); |
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115 if( obj instanceof LuanException ) { |
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116 LuanException le = (LuanException)obj; |
201
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minir
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117 return le.getFullMessage(); |
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118 } |
113
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119 if( obj instanceof byte[] ) |
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120 return "binary: " + Integer.toHexString(obj.hashCode()); |
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121 return obj.toString(); |
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122 } |
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123 |
88
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124 public static String stringEncode(String s) { |
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125 s = s.replace("\\","\\\\"); |
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126 s = s.replace("\u0007","\\a"); |
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127 s = s.replace("\b","\\b"); |
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128 s = s.replace("\f","\\f"); |
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129 s = s.replace("\n","\\n"); |
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130 s = s.replace("\r","\\r"); |
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131 s = s.replace("\t","\\t"); |
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132 s = s.replace("\u000b","\\v"); |
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133 s = s.replace("\"","\\\""); |
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134 return s; |
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135 } |
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136 |
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137 public static String repr(Object obj) { |
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138 if( obj == null ) |
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139 return "nil"; |
147
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140 if( obj instanceof Boolean ) |
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141 return Luan.toString((Boolean)obj); |
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142 if( obj instanceof Number ) |
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143 return Luan.toString((Number)obj); |
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144 if( obj instanceof String ) |
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145 return "\"" + stringEncode((String)obj) + "\""; |
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146 if( obj instanceof LuanRepr ) |
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147 return ((LuanRepr)obj).repr(); |
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148 return null; |
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149 } |
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150 |
221
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151 public static LuanTable newTable() { |
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152 return new LuanTableImpl(); |
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153 } |
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154 |
226
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155 public static LuanTable newPropertyTable() { |
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156 return new LuanPropertyTable(); |
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157 } |
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158 |
66
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159 private Luan() {} // never |
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160 } |