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annotate src/luan/Lua.java @ 10:8217d8485715

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fix string conversion git-svn-id: https://luan-java.googlecode.com/svn/trunk@11 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Thu, 22 Nov 2012 04:37:10 +0000
parents bca8fc5d928b
children e51906de0f11
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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1 package luan;
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4 public class Lua {
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6 public static String type(Object obj) {
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7 if( obj == null )
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8 return "nil";
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9 if( obj instanceof String )
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10 return "string";
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11 if( obj instanceof Boolean )
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12 return "boolean";
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13 if( obj instanceof LuaNumber )
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14 return "number";
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15 return "userdata";
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16 }
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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18 public static boolean toBoolean(Object obj) {
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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19 return obj != null && !Boolean.FALSE.equals(obj);
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20 }
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22 public static String toString(Object obj) {
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23 if( obj == null )
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24 return "nil";
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25 return obj.toString();
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26 }
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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28 public static String asString(Object obj) {
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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29 if( obj instanceof String || obj instanceof LuaNumber )
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30 return obj.toString();
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31 return null;
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32 }
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34 public static String checkString(Object obj) throws LuaException {
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35 String s = asString(obj);
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36 if( s == null )
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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37 throw new LuaException( "attempt to use a " + Lua.type(obj) + " as a string" );
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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38 return s;
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39 }
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41 public static LuaNumber toNumber(Object obj) {
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42 if( obj instanceof LuaNumber )
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43 return (LuaNumber)obj;
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44 if( obj instanceof String ) {
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45 String s = (String)obj;
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46 try {
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47 return new LuaNumber( Double.parseDouble(s) );
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48 } catch(NumberFormatException e) {}
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49 }
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50 return null;
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51 }
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53 public static LuaNumber checkNumber(Object obj) throws LuaException {
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54 LuaNumber n = toNumber(obj);
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55 if( n == null )
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56 throw new LuaException( "attempt to perform arithmetic on a " + type(obj) + " value" );
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57 return n;
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58 }
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60 public static LuaFunction checkFunction(Object obj) throws LuaException {
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61 if( obj instanceof LuaFunction )
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62 return (LuaFunction)obj;
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63 throw new LuaException( "attempt to call a " + type(obj) + " value" );
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64 }
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66 }