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annotate src/luan/interp/ExpList.java @ 31:5cf15507d77e

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separate interpreter from interface git-svn-id: https://luan-java.googlecode.com/svn/trunk@32 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Thu, 13 Dec 2012 02:50:04 +0000
parents 3b22ffbdb83a
children e3624b7cd603
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1 package luan.interp;
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3 import java.util.List;
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4 import java.util.ArrayList;
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5 import java.util.Collections;
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6 import luan.LuaException;
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9 final class ExpList implements Expressions {
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11 private interface Adder {
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12 public void addTo(LuaStateImpl lua,List<Object> list) throws LuaException;
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13 }
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15 private static class ExprAdder implements Adder {
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16 private final Expr expr;
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18 ExprAdder(Expr expr) {
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19 this.expr = expr;
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20 }
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22 public void addTo(LuaStateImpl lua,List<Object> list) throws LuaException {
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23 list.add( expr.eval(lua) );
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24 }
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26 }
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28 private static class ExpressionsAdder implements Adder {
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29 private final Expressions expressions;
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31 ExpressionsAdder(Expressions expressions) {
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32 this.expressions = expressions;
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33 }
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35 public void addTo(LuaStateImpl lua,List<Object> list) throws LuaException {
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36 for( Object val : expressions.eval(lua) ) {
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37 list.add( val );
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38 }
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39 }
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41 }
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43 static class Builder {
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44 private final List<Adder> adders = new ArrayList<Adder>();
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46 void add(Expr expr) {
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47 adders.add( new ExprAdder(expr) );
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48 }
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50 void add(Expressions expressions) {
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51 adders.add( new ExpressionsAdder(expressions) );
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52 }
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54 Expressions build() {
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55 if( adders.isEmpty() )
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56 return emptyExpList;
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57 if( adders.size() == 1 ) {
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58 Adder adder = adders.get(0);
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59 if( adder instanceof ExpressionsAdder ) {
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60 ExpressionsAdder ea = (ExpressionsAdder)adder;
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61 return ea.expressions;
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62 }
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63 ExprAdder ea = (ExprAdder)adder;
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64 return new SingleExpList(ea.expr);
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65 }
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66 return new ExpList( adders.toArray(new Adder[0]) );
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67 }
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68 }
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70 private static final Object[] EMPTY = new Object[0];
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72 static final Expressions emptyExpList = new Expressions() {
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73 @Override public Object[] eval(LuaStateImpl lua) {
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74 return EMPTY;
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75 }
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76 };
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78 static class SingleExpList implements Expressions {
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79 private final Expr expr;
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81 SingleExpList(Expr expr) {
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82 this.expr = expr;
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83 }
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85 @Override public Object[] eval(LuaStateImpl lua) throws LuaException {
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86 return new Object[]{expr.eval(lua)};
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87 }
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88 }
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90 private final Adder[] adders;
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92 private ExpList(Adder[] adders) {
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93 this.adders = adders;
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94 }
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96 @Override public Object[] eval(LuaStateImpl lua) throws LuaException {
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97 List<Object> list = new ArrayList<Object>();
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98 for( Adder adder : adders ) {
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99 adder.addTo(lua,list);
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100 }
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101 return list.toArray();
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102 }
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103 }