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annotate src/luan/Luan.java @ 85:b2551f00bc51

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fix type() git-svn-id: https://luan-java.googlecode.com/svn/trunk@86 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Mon, 25 Feb 2013 03:53:54 +0000
parents f7e17cfb35f9
children 6ca02b188dba
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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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4 public final class Luan {
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5 public static final String version = "Luan 0.0";
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7 public static String type(Object obj) {
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8 if( obj == null )
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9 return "nil";
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10 if( obj instanceof String )
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11 return "string";
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12 if( obj instanceof Boolean )
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13 return "boolean";
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14 if( obj instanceof Number )
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15 return "number";
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b2551f00bc51 fix type()
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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16 if( obj instanceof LuanTable )
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17 return "table";
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18 if( obj instanceof LuanFunction )
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19 return "function";
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20 return "userdata";
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21 }
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22
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23 public static boolean toBoolean(Object obj) {
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24 return obj != null && !Boolean.FALSE.equals(obj);
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25 }
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27 public static String asString(Object obj) {
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28 if( obj instanceof String )
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29 return (String)obj;
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30 if( obj instanceof Number )
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31 return toString((Number)obj);
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32 return null;
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33 }
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35 public static Number toNumber(Object obj) {
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36 return toNumber(obj,null);
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37 }
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39 public static Number toNumber(Object obj,Integer base) {
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40 if( obj instanceof Number )
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41 return (Number)obj;
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42 if( obj instanceof String ) {
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43 String s = (String)obj;
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44 try {
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45 if( base==null )
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46 return Double.valueOf(s);
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47 else
46
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48 return Long.valueOf(s,base);
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49 } catch(NumberFormatException e) {}
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50 }
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51 return null;
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52 }
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54 public static Object first(Object[] a) {
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55 return a.length==0 ? null : a[0];
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56 }
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58 public static String toString(Number n) {
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59 if( n instanceof Integer )
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60 return n.toString();
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61 String s = n.toString();
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62 int iE = s.indexOf('E');
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63 String ending = null;
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64 if( iE != -1 ) {
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65 ending = s.substring(iE);
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66 s = s.substring(0,iE);
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67 }
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68 if( s.endsWith(".0") )
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69 s = s.substring(0,s.length()-2);
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70 if( ending != null )
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71 s += ending;
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72 return s;
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73 }
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74
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75 public static Integer asInteger(Object obj) {
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76 if( obj instanceof Integer )
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77 return (Integer)obj;
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78 if( !(obj instanceof Number) )
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79 return null;
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80 Number n = (Number)obj;
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81 int i = n.intValue();
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82 return i==n.doubleValue() ? Integer.valueOf(i) : null;
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83 }
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84
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85 public static String toString(Object obj) {
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86 if( obj == null )
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87 return "nil";
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88 if( obj instanceof Number )
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89 return Luan.toString((Number)obj);
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90 if( obj instanceof LuanException ) {
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91 LuanException le = (LuanException)obj;
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92 return le.getMessage();
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93 }
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94 return obj.toString();
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95 }
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96
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97 private Luan() {} // never
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98 }