/interpreter/tags/at2dist220411/src/edu/vub/at/objects/natives/grammar/AGClosureLiteral.java
Java | 142 lines | 75 code | 15 blank | 52 comment | 2 complexity | 7c97377295724fe63daace5564d5f088 MD5 | raw file
1/** 2 * AmbientTalk/2 Project 3 * AGClosureLiteral.java created on 26-jul-2006 at 16:59:04 4 * (c) Programming Technology Lab, 2006 - 2007 5 * Authors: Tom Van Cutsem & Stijn Mostinckx 6 * 7 * Permission is hereby granted, free of charge, to any person 8 * obtaining a copy of this software and associated documentation 9 * files (the "Software"), to deal in the Software without 10 * restriction, including without limitation the rights to use, 11 * copy, modify, merge, publish, distribute, sublicense, and/or 12 * sell copies of the Software, and to permit persons to whom the 13 * Software is furnished to do so, subject to the following 14 * conditions: 15 * 16 * The above copyright notice and this permission notice shall be 17 * included in all copies or substantial portions of the Software. 18 * 19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 20 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES 21 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 22 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT 23 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 24 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 25 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 26 * OTHER DEALINGS IN THE SOFTWARE. 27 */ 28package edu.vub.at.objects.natives.grammar; 29 30import edu.vub.at.eval.Evaluator; 31import edu.vub.at.exceptions.InterpreterException; 32import edu.vub.at.objects.ATContext; 33import edu.vub.at.objects.ATObject; 34import edu.vub.at.objects.ATTable; 35import edu.vub.at.objects.grammar.ATBegin; 36import edu.vub.at.objects.grammar.ATClosureLiteral; 37import edu.vub.at.objects.mirrors.NativeClosure; 38import edu.vub.at.objects.natives.NATClosure; 39import edu.vub.at.objects.natives.NATMethod; 40import edu.vub.at.objects.natives.NATTable; 41import edu.vub.at.objects.natives.NATText; 42import edu.vub.util.TempFieldGenerator; 43 44import java.util.Set; 45 46/** 47 * The native implementation of a literal closure AG element. 48 * 49 * @author tvc 50 */ 51public final class AGClosureLiteral extends AGExpression implements ATClosureLiteral { 52 53 protected final ATTable arguments_; 54 protected final ATBegin body_; 55 56 private NATMethod preprocessedMethod_; 57 58 public AGClosureLiteral(ATTable args, ATBegin body) throws InterpreterException { 59 arguments_ = args; 60 body_ = body; 61 } 62 63 public ATTable base_arguments() { return arguments_; } 64 65 public ATBegin base_bodyExpression() { return body_; } 66 67 /** 68 * To evaluate a closure literal, construct a closure pairing the literal's arguments and body with the 69 * current evaluation context. 70 * 71 * AGCLOLIT(arg,bdy).eval(ctx) = AGCLO(AGMTH("lambda",arg,bdy), ctx) 72 * 73 * @return a native closure closing over the current evaluation context. 74 */ 75 public ATObject meta_eval(ATContext ctx) throws InterpreterException { 76 // the method is not yet created in the constructor because this gives problems 77 // with quoted parameters: a quoted parameter would result in an illegal parameter 78 // exception while actually the block was defined in the context of a quotation, 79 // so at runtime the block would have never been evaluated (but quoted instead) 80 if (preprocessedMethod_ == null) { 81 preprocessedMethod_ = new NATMethod(Evaluator._LAMBDA_, arguments_, body_, NATTable.EMPTY); 82 preprocessedMethod_.impl_setLocation(this.impl_getLocation()); 83 } 84 return new NATClosure(preprocessedMethod_, ctx); 85 } 86 87 /** 88 * Quoting a closure literal results in a new quoted closure literal. 89 * 90 * AGCLOLIT(arg,bdy).quote(ctx) = AGCLOLIT(arg.quote(ctx), bdy.quote(ctx)) 91 */ 92 public ATObject meta_quote(ATContext ctx) throws InterpreterException { 93 return new AGClosureLiteral(arguments_.meta_quote(ctx).asTable(), 94 body_.meta_quote(ctx).asBegin()); 95 } 96 97 public NATText meta_print() throws InterpreterException { 98 return arguments_.base_isEmpty().base_ifTrue_ifFalse_( 99 new NativeClosure(this) { 100 public ATObject base_apply(ATTable args) throws InterpreterException { 101 return NATText.atValue("{ "+ body_.meta_print().javaValue + " }"); 102 } 103 }, 104 new NativeClosure(this) { 105 public ATObject base_apply(ATTable args) throws InterpreterException { 106 return NATText.atValue(Evaluator.printElements(arguments_.asNativeTable(), "{ |", ",", "| ").javaValue + 107 body_.meta_print().javaValue+"}"); 108 } 109 }).asNativeText(); 110 } 111 112 public NATText impl_asUnquotedCode(final TempFieldGenerator objectMap) throws InterpreterException { 113 return arguments_.base_isEmpty().base_ifTrue_ifFalse_( 114 new NativeClosure(this) { 115 public ATObject base_apply(ATTable args) throws InterpreterException { 116 return NATText.atValue("{ "+ body_.impl_asUnquotedCode(objectMap).javaValue + " }"); 117 } 118 }, 119 new NativeClosure(this) { 120 public ATObject base_apply(ATTable args) throws InterpreterException { 121 return NATText.atValue("{" + Evaluator.codeAsParameterList(objectMap, arguments_.asNativeTable()).javaValue + 122 body_.impl_asUnquotedCode(objectMap).javaValue+"}"); 123 } 124 }).asNativeText(); 125 } 126 127 /** 128 * FV({ |args| body }) = FV(optionalArgExps) U (FV(body) \ { args }) 129 */ 130 public Set impl_freeVariables() throws InterpreterException { 131 Set fvBody = body_.impl_freeVariables(); 132 Evaluator.processFreeVariables(fvBody, arguments_); 133 return fvBody; 134 } 135 136 public Set impl_quotedFreeVariables() throws InterpreterException { 137 Set qfv = arguments_.impl_quotedFreeVariables(); 138 qfv.addAll(body_.impl_quotedFreeVariables()); 139 return qfv; 140 } 141 142}