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| <FONT color="green">001</FONT> /*<a name="line.1"></a> |
| <FONT color="green">002</FONT> * Licensed to the Apache Software Foundation (ASF) under one<a name="line.2"></a> |
| <FONT color="green">003</FONT> * or more contributor license agreements. See the NOTICE file<a name="line.3"></a> |
| <FONT color="green">004</FONT> * distributed with this work for additional information<a name="line.4"></a> |
| <FONT color="green">005</FONT> * regarding copyright ownership. The ASF licenses this file<a name="line.5"></a> |
| <FONT color="green">006</FONT> * to you under the Apache License, Version 2.0 (the "License");<a name="line.6"></a> |
| <FONT color="green">007</FONT> * you may not use this file except in compliance with the License.<a name="line.7"></a> |
| <FONT color="green">008</FONT> * You may obtain a copy of the License at<a name="line.8"></a> |
| <FONT color="green">009</FONT> *<a name="line.9"></a> |
| <FONT color="green">010</FONT> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.10"></a> |
| <FONT color="green">011</FONT> *<a name="line.11"></a> |
| <FONT color="green">012</FONT> * Unless required by applicable law or agreed to in writing, software<a name="line.12"></a> |
| <FONT color="green">013</FONT> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.13"></a> |
| <FONT color="green">014</FONT> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.14"></a> |
| <FONT color="green">015</FONT> * See the License for the specific language governing permissions and<a name="line.15"></a> |
| <FONT color="green">016</FONT> * limitations under the License.<a name="line.16"></a> |
| <FONT color="green">017</FONT> */<a name="line.17"></a> |
| <FONT color="green">018</FONT> /*<a name="line.18"></a> |
| <FONT color="green">019</FONT> * $Id: CastExpr.java 468650 2006-10-28 07:03:30Z minchau $<a name="line.19"></a> |
| <FONT color="green">020</FONT> */<a name="line.20"></a> |
| <FONT color="green">021</FONT> <a name="line.21"></a> |
| <FONT color="green">022</FONT> package org.apache.xalan.xsltc.compiler;<a name="line.22"></a> |
| <FONT color="green">023</FONT> <a name="line.23"></a> |
| <FONT color="green">024</FONT> import org.apache.bcel.generic.ConstantPoolGen;<a name="line.24"></a> |
| <FONT color="green">025</FONT> import org.apache.bcel.generic.IF_ICMPNE;<a name="line.25"></a> |
| <FONT color="green">026</FONT> import org.apache.bcel.generic.INVOKEINTERFACE;<a name="line.26"></a> |
| <FONT color="green">027</FONT> import org.apache.bcel.generic.InstructionList;<a name="line.27"></a> |
| <FONT color="green">028</FONT> import org.apache.bcel.generic.SIPUSH;<a name="line.28"></a> |
| <FONT color="green">029</FONT> import org.apache.xalan.xsltc.compiler.util.BooleanType;<a name="line.29"></a> |
| <FONT color="green">030</FONT> import org.apache.xalan.xsltc.compiler.util.ClassGenerator;<a name="line.30"></a> |
| <FONT color="green">031</FONT> import org.apache.xalan.xsltc.compiler.util.ErrorMsg;<a name="line.31"></a> |
| <FONT color="green">032</FONT> import org.apache.xalan.xsltc.compiler.util.MethodGenerator;<a name="line.32"></a> |
| <FONT color="green">033</FONT> import org.apache.xalan.xsltc.compiler.util.MultiHashtable;<a name="line.33"></a> |
| <FONT color="green">034</FONT> import org.apache.xalan.xsltc.compiler.util.NodeType;<a name="line.34"></a> |
| <FONT color="green">035</FONT> import org.apache.xalan.xsltc.compiler.util.ResultTreeType;<a name="line.35"></a> |
| <FONT color="green">036</FONT> import org.apache.xalan.xsltc.compiler.util.Type;<a name="line.36"></a> |
| <FONT color="green">037</FONT> import org.apache.xalan.xsltc.compiler.util.TypeCheckError;<a name="line.37"></a> |
| <FONT color="green">038</FONT> import org.apache.xml.dtm.Axis;<a name="line.38"></a> |
| <FONT color="green">039</FONT> <a name="line.39"></a> |
| <FONT color="green">040</FONT> /**<a name="line.40"></a> |
| <FONT color="green">041</FONT> * @author Jacek Ambroziak<a name="line.41"></a> |
| <FONT color="green">042</FONT> * @author Santiago Pericas-Geertsen<a name="line.42"></a> |
| <FONT color="green">043</FONT> * @author Morten Jorgensen<a name="line.43"></a> |
| <FONT color="green">044</FONT> * @author Erwin Bolwidt <ejb@klomp.org><a name="line.44"></a> |
| <FONT color="green">045</FONT> */<a name="line.45"></a> |
| <FONT color="green">046</FONT> final class CastExpr extends Expression {<a name="line.46"></a> |
| <FONT color="green">047</FONT> private final Expression _left;<a name="line.47"></a> |
| <FONT color="green">048</FONT> <a name="line.48"></a> |
| <FONT color="green">049</FONT> /**<a name="line.49"></a> |
| <FONT color="green">050</FONT> * Legal conversions between internal types.<a name="line.50"></a> |
| <FONT color="green">051</FONT> */<a name="line.51"></a> |
| <FONT color="green">052</FONT> static private MultiHashtable InternalTypeMap = new MultiHashtable();<a name="line.52"></a> |
| <FONT color="green">053</FONT> <a name="line.53"></a> |
| <FONT color="green">054</FONT> static {<a name="line.54"></a> |
| <FONT color="green">055</FONT> // Possible type conversions between internal types<a name="line.55"></a> |
| <FONT color="green">056</FONT> InternalTypeMap.put(Type.Boolean, Type.Boolean);<a name="line.56"></a> |
| <FONT color="green">057</FONT> InternalTypeMap.put(Type.Boolean, Type.Real);<a name="line.57"></a> |
| <FONT color="green">058</FONT> InternalTypeMap.put(Type.Boolean, Type.String);<a name="line.58"></a> |
| <FONT color="green">059</FONT> InternalTypeMap.put(Type.Boolean, Type.Reference);<a name="line.59"></a> |
| <FONT color="green">060</FONT> InternalTypeMap.put(Type.Boolean, Type.Object);<a name="line.60"></a> |
| <FONT color="green">061</FONT> <a name="line.61"></a> |
| <FONT color="green">062</FONT> InternalTypeMap.put(Type.Real, Type.Real);<a name="line.62"></a> |
| <FONT color="green">063</FONT> InternalTypeMap.put(Type.Real, Type.Int);<a name="line.63"></a> |
| <FONT color="green">064</FONT> InternalTypeMap.put(Type.Real, Type.Boolean);<a name="line.64"></a> |
| <FONT color="green">065</FONT> InternalTypeMap.put(Type.Real, Type.String);<a name="line.65"></a> |
| <FONT color="green">066</FONT> InternalTypeMap.put(Type.Real, Type.Reference);<a name="line.66"></a> |
| <FONT color="green">067</FONT> InternalTypeMap.put(Type.Real, Type.Object);<a name="line.67"></a> |
| <FONT color="green">068</FONT> <a name="line.68"></a> |
| <FONT color="green">069</FONT> InternalTypeMap.put(Type.Int, Type.Int);<a name="line.69"></a> |
| <FONT color="green">070</FONT> InternalTypeMap.put(Type.Int, Type.Real);<a name="line.70"></a> |
| <FONT color="green">071</FONT> InternalTypeMap.put(Type.Int, Type.Boolean);<a name="line.71"></a> |
| <FONT color="green">072</FONT> InternalTypeMap.put(Type.Int, Type.String);<a name="line.72"></a> |
| <FONT color="green">073</FONT> InternalTypeMap.put(Type.Int, Type.Reference);<a name="line.73"></a> |
| <FONT color="green">074</FONT> InternalTypeMap.put(Type.Int, Type.Object);<a name="line.74"></a> |
| <FONT color="green">075</FONT> <a name="line.75"></a> |
| <FONT color="green">076</FONT> InternalTypeMap.put(Type.String, Type.String);<a name="line.76"></a> |
| <FONT color="green">077</FONT> InternalTypeMap.put(Type.String, Type.Boolean);<a name="line.77"></a> |
| <FONT color="green">078</FONT> InternalTypeMap.put(Type.String, Type.Real);<a name="line.78"></a> |
| <FONT color="green">079</FONT> InternalTypeMap.put(Type.String, Type.Reference);<a name="line.79"></a> |
| <FONT color="green">080</FONT> InternalTypeMap.put(Type.String, Type.Object);<a name="line.80"></a> |
| <FONT color="green">081</FONT> <a name="line.81"></a> |
| <FONT color="green">082</FONT> InternalTypeMap.put(Type.NodeSet, Type.NodeSet);<a name="line.82"></a> |
| <FONT color="green">083</FONT> InternalTypeMap.put(Type.NodeSet, Type.Boolean);<a name="line.83"></a> |
| <FONT color="green">084</FONT> InternalTypeMap.put(Type.NodeSet, Type.Real);<a name="line.84"></a> |
| <FONT color="green">085</FONT> InternalTypeMap.put(Type.NodeSet, Type.String);<a name="line.85"></a> |
| <FONT color="green">086</FONT> InternalTypeMap.put(Type.NodeSet, Type.Node);<a name="line.86"></a> |
| <FONT color="green">087</FONT> InternalTypeMap.put(Type.NodeSet, Type.Reference);<a name="line.87"></a> |
| <FONT color="green">088</FONT> InternalTypeMap.put(Type.NodeSet, Type.Object);<a name="line.88"></a> |
| <FONT color="green">089</FONT> <a name="line.89"></a> |
| <FONT color="green">090</FONT> InternalTypeMap.put(Type.Node, Type.Node);<a name="line.90"></a> |
| <FONT color="green">091</FONT> InternalTypeMap.put(Type.Node, Type.Boolean);<a name="line.91"></a> |
| <FONT color="green">092</FONT> InternalTypeMap.put(Type.Node, Type.Real);<a name="line.92"></a> |
| <FONT color="green">093</FONT> InternalTypeMap.put(Type.Node, Type.String);<a name="line.93"></a> |
| <FONT color="green">094</FONT> InternalTypeMap.put(Type.Node, Type.NodeSet);<a name="line.94"></a> |
| <FONT color="green">095</FONT> InternalTypeMap.put(Type.Node, Type.Reference);<a name="line.95"></a> |
| <FONT color="green">096</FONT> InternalTypeMap.put(Type.Node, Type.Object);<a name="line.96"></a> |
| <FONT color="green">097</FONT> <a name="line.97"></a> |
| <FONT color="green">098</FONT> InternalTypeMap.put(Type.ResultTree, Type.ResultTree);<a name="line.98"></a> |
| <FONT color="green">099</FONT> InternalTypeMap.put(Type.ResultTree, Type.Boolean);<a name="line.99"></a> |
| <FONT color="green">100</FONT> InternalTypeMap.put(Type.ResultTree, Type.Real);<a name="line.100"></a> |
| <FONT color="green">101</FONT> InternalTypeMap.put(Type.ResultTree, Type.String);<a name="line.101"></a> |
| <FONT color="green">102</FONT> InternalTypeMap.put(Type.ResultTree, Type.NodeSet);<a name="line.102"></a> |
| <FONT color="green">103</FONT> InternalTypeMap.put(Type.ResultTree, Type.Reference);<a name="line.103"></a> |
| <FONT color="green">104</FONT> InternalTypeMap.put(Type.ResultTree, Type.Object);<a name="line.104"></a> |
| <FONT color="green">105</FONT> <a name="line.105"></a> |
| <FONT color="green">106</FONT> InternalTypeMap.put(Type.Reference, Type.Reference);<a name="line.106"></a> |
| <FONT color="green">107</FONT> InternalTypeMap.put(Type.Reference, Type.Boolean);<a name="line.107"></a> |
| <FONT color="green">108</FONT> InternalTypeMap.put(Type.Reference, Type.Int);<a name="line.108"></a> |
| <FONT color="green">109</FONT> InternalTypeMap.put(Type.Reference, Type.Real);<a name="line.109"></a> |
| <FONT color="green">110</FONT> InternalTypeMap.put(Type.Reference, Type.String);<a name="line.110"></a> |
| <FONT color="green">111</FONT> InternalTypeMap.put(Type.Reference, Type.Node);<a name="line.111"></a> |
| <FONT color="green">112</FONT> InternalTypeMap.put(Type.Reference, Type.NodeSet);<a name="line.112"></a> |
| <FONT color="green">113</FONT> InternalTypeMap.put(Type.Reference, Type.ResultTree);<a name="line.113"></a> |
| <FONT color="green">114</FONT> InternalTypeMap.put(Type.Reference, Type.Object);<a name="line.114"></a> |
| <FONT color="green">115</FONT> <a name="line.115"></a> |
| <FONT color="green">116</FONT> InternalTypeMap.put(Type.Object, Type.String);<a name="line.116"></a> |
| <FONT color="green">117</FONT> <a name="line.117"></a> |
| <FONT color="green">118</FONT> InternalTypeMap.put(Type.Void, Type.String);<a name="line.118"></a> |
| <FONT color="green">119</FONT> }<a name="line.119"></a> |
| <FONT color="green">120</FONT> <a name="line.120"></a> |
| <FONT color="green">121</FONT> private boolean _typeTest = false;<a name="line.121"></a> |
| <FONT color="green">122</FONT> <a name="line.122"></a> |
| <FONT color="green">123</FONT> /**<a name="line.123"></a> |
| <FONT color="green">124</FONT> * Construct a cast expression and check that the conversion is <a name="line.124"></a> |
| <FONT color="green">125</FONT> * valid by calling typeCheck().<a name="line.125"></a> |
| <FONT color="green">126</FONT> */<a name="line.126"></a> |
| <FONT color="green">127</FONT> public CastExpr(Expression left, Type type) throws TypeCheckError {<a name="line.127"></a> |
| <FONT color="green">128</FONT> _left = left;<a name="line.128"></a> |
| <FONT color="green">129</FONT> _type = type; // use inherited field<a name="line.129"></a> |
| <FONT color="green">130</FONT> <a name="line.130"></a> |
| <FONT color="green">131</FONT> if ((_left instanceof Step) && (_type == Type.Boolean)) {<a name="line.131"></a> |
| <FONT color="green">132</FONT> Step step = (Step)_left;<a name="line.132"></a> |
| <FONT color="green">133</FONT> if ((step.getAxis() == Axis.SELF) && (step.getNodeType() != -1)) <a name="line.133"></a> |
| <FONT color="green">134</FONT> _typeTest = true;<a name="line.134"></a> |
| <FONT color="green">135</FONT> }<a name="line.135"></a> |
| <FONT color="green">136</FONT> <a name="line.136"></a> |
| <FONT color="green">137</FONT> // check if conversion is valid<a name="line.137"></a> |
| <FONT color="green">138</FONT> setParser(left.getParser());<a name="line.138"></a> |
| <FONT color="green">139</FONT> setParent(left.getParent());<a name="line.139"></a> |
| <FONT color="green">140</FONT> left.setParent(this);<a name="line.140"></a> |
| <FONT color="green">141</FONT> typeCheck(left.getParser().getSymbolTable());<a name="line.141"></a> |
| <FONT color="green">142</FONT> }<a name="line.142"></a> |
| <FONT color="green">143</FONT> <a name="line.143"></a> |
| <FONT color="green">144</FONT> public Expression getExpr() {<a name="line.144"></a> |
| <FONT color="green">145</FONT> return _left;<a name="line.145"></a> |
| <FONT color="green">146</FONT> }<a name="line.146"></a> |
| <FONT color="green">147</FONT> <a name="line.147"></a> |
| <FONT color="green">148</FONT> /**<a name="line.148"></a> |
| <FONT color="green">149</FONT> * Returns true if this expressions contains a call to position(). This is<a name="line.149"></a> |
| <FONT color="green">150</FONT> * needed for context changes in node steps containing multiple predicates.<a name="line.150"></a> |
| <FONT color="green">151</FONT> */<a name="line.151"></a> |
| <FONT color="green">152</FONT> public boolean hasPositionCall() {<a name="line.152"></a> |
| <FONT color="green">153</FONT> return(_left.hasPositionCall());<a name="line.153"></a> |
| <FONT color="green">154</FONT> }<a name="line.154"></a> |
| <FONT color="green">155</FONT> <a name="line.155"></a> |
| <FONT color="green">156</FONT> public boolean hasLastCall() {<a name="line.156"></a> |
| <FONT color="green">157</FONT> return(_left.hasLastCall());<a name="line.157"></a> |
| <FONT color="green">158</FONT> }<a name="line.158"></a> |
| <FONT color="green">159</FONT> <a name="line.159"></a> |
| <FONT color="green">160</FONT> public String toString() {<a name="line.160"></a> |
| <FONT color="green">161</FONT> return "cast(" + _left + ", " + _type + ")";<a name="line.161"></a> |
| <FONT color="green">162</FONT> }<a name="line.162"></a> |
| <FONT color="green">163</FONT> <a name="line.163"></a> |
| <FONT color="green">164</FONT> /**<a name="line.164"></a> |
| <FONT color="green">165</FONT> * Type checking a cast expression amounts to verifying that the <a name="line.165"></a> |
| <FONT color="green">166</FONT> * type conversion is legal. Cast expressions are created during <a name="line.166"></a> |
| <FONT color="green">167</FONT> * type checking, but typeCheck() is usually not called on them. <a name="line.167"></a> |
| <FONT color="green">168</FONT> * As a result, this method is called from the constructor.<a name="line.168"></a> |
| <FONT color="green">169</FONT> */ <a name="line.169"></a> |
| <FONT color="green">170</FONT> public Type typeCheck(SymbolTable stable) throws TypeCheckError {<a name="line.170"></a> |
| <FONT color="green">171</FONT> Type tleft = _left.getType();<a name="line.171"></a> |
| <FONT color="green">172</FONT> if (tleft == null) {<a name="line.172"></a> |
| <FONT color="green">173</FONT> tleft = _left.typeCheck(stable);<a name="line.173"></a> |
| <FONT color="green">174</FONT> }<a name="line.174"></a> |
| <FONT color="green">175</FONT> if (tleft instanceof NodeType) {<a name="line.175"></a> |
| <FONT color="green">176</FONT> tleft = Type.Node; // multiple instances<a name="line.176"></a> |
| <FONT color="green">177</FONT> }<a name="line.177"></a> |
| <FONT color="green">178</FONT> else if (tleft instanceof ResultTreeType) {<a name="line.178"></a> |
| <FONT color="green">179</FONT> tleft = Type.ResultTree; // multiple instances<a name="line.179"></a> |
| <FONT color="green">180</FONT> }<a name="line.180"></a> |
| <FONT color="green">181</FONT> if (InternalTypeMap.maps(tleft, _type) != null) {<a name="line.181"></a> |
| <FONT color="green">182</FONT> return _type;<a name="line.182"></a> |
| <FONT color="green">183</FONT> }<a name="line.183"></a> |
| <FONT color="green">184</FONT> // throw new TypeCheckError(this); <a name="line.184"></a> |
| <FONT color="green">185</FONT> throw new TypeCheckError(new ErrorMsg(<a name="line.185"></a> |
| <FONT color="green">186</FONT> ErrorMsg.DATA_CONVERSION_ERR, tleft.toString(), _type.toString()));<a name="line.186"></a> |
| <FONT color="green">187</FONT> }<a name="line.187"></a> |
| <FONT color="green">188</FONT> <a name="line.188"></a> |
| <FONT color="green">189</FONT> public void translateDesynthesized(ClassGenerator classGen, <a name="line.189"></a> |
| <FONT color="green">190</FONT> MethodGenerator methodGen) {<a name="line.190"></a> |
| <FONT color="green">191</FONT> FlowList fl;<a name="line.191"></a> |
| <FONT color="green">192</FONT> final Type ltype = _left.getType();<a name="line.192"></a> |
| <FONT color="green">193</FONT> <a name="line.193"></a> |
| <FONT color="green">194</FONT> // This is a special case for the self:: axis. Instead of letting<a name="line.194"></a> |
| <FONT color="green">195</FONT> // the Step object create and iterator that we cast back to a single<a name="line.195"></a> |
| <FONT color="green">196</FONT> // node, we simply ask the DOM for the node type.<a name="line.196"></a> |
| <FONT color="green">197</FONT> if (_typeTest) {<a name="line.197"></a> |
| <FONT color="green">198</FONT> final ConstantPoolGen cpg = classGen.getConstantPool();<a name="line.198"></a> |
| <FONT color="green">199</FONT> final InstructionList il = methodGen.getInstructionList();<a name="line.199"></a> |
| <FONT color="green">200</FONT> <a name="line.200"></a> |
| <FONT color="green">201</FONT> final int idx = cpg.addInterfaceMethodref(DOM_INTF,<a name="line.201"></a> |
| <FONT color="green">202</FONT> "getExpandedTypeID",<a name="line.202"></a> |
| <FONT color="green">203</FONT> "(I)I");<a name="line.203"></a> |
| <FONT color="green">204</FONT> il.append(new SIPUSH((short)((Step)_left).getNodeType()));<a name="line.204"></a> |
| <FONT color="green">205</FONT> il.append(methodGen.loadDOM());<a name="line.205"></a> |
| <FONT color="green">206</FONT> il.append(methodGen.loadContextNode());<a name="line.206"></a> |
| <FONT color="green">207</FONT> il.append(new INVOKEINTERFACE(idx, 2));<a name="line.207"></a> |
| <FONT color="green">208</FONT> _falseList.add(il.append(new IF_ICMPNE(null)));<a name="line.208"></a> |
| <FONT color="green">209</FONT> }<a name="line.209"></a> |
| <FONT color="green">210</FONT> else {<a name="line.210"></a> |
| <FONT color="green">211</FONT> <a name="line.211"></a> |
| <FONT color="green">212</FONT> _left.translate(classGen, methodGen);<a name="line.212"></a> |
| <FONT color="green">213</FONT> if (_type != ltype) {<a name="line.213"></a> |
| <FONT color="green">214</FONT> _left.startIterator(classGen, methodGen);<a name="line.214"></a> |
| <FONT color="green">215</FONT> if (_type instanceof BooleanType) {<a name="line.215"></a> |
| <FONT color="green">216</FONT> fl = ltype.translateToDesynthesized(classGen, methodGen,<a name="line.216"></a> |
| <FONT color="green">217</FONT> _type);<a name="line.217"></a> |
| <FONT color="green">218</FONT> if (fl != null) {<a name="line.218"></a> |
| <FONT color="green">219</FONT> _falseList.append(fl);<a name="line.219"></a> |
| <FONT color="green">220</FONT> }<a name="line.220"></a> |
| <FONT color="green">221</FONT> }<a name="line.221"></a> |
| <FONT color="green">222</FONT> else {<a name="line.222"></a> |
| <FONT color="green">223</FONT> ltype.translateTo(classGen, methodGen, _type); <a name="line.223"></a> |
| <FONT color="green">224</FONT> }<a name="line.224"></a> |
| <FONT color="green">225</FONT> }<a name="line.225"></a> |
| <FONT color="green">226</FONT> }<a name="line.226"></a> |
| <FONT color="green">227</FONT> }<a name="line.227"></a> |
| <FONT color="green">228</FONT> <a name="line.228"></a> |
| <FONT color="green">229</FONT> public void translate(ClassGenerator classGen, MethodGenerator methodGen) {<a name="line.229"></a> |
| <FONT color="green">230</FONT> final Type ltype = _left.getType();<a name="line.230"></a> |
| <FONT color="green">231</FONT> _left.translate(classGen, methodGen);<a name="line.231"></a> |
| <FONT color="green">232</FONT> if (_type.identicalTo(ltype) == false) {<a name="line.232"></a> |
| <FONT color="green">233</FONT> _left.startIterator(classGen, methodGen);<a name="line.233"></a> |
| <FONT color="green">234</FONT> ltype.translateTo(classGen, methodGen, _type);<a name="line.234"></a> |
| <FONT color="green">235</FONT> }<a name="line.235"></a> |
| <FONT color="green">236</FONT> }<a name="line.236"></a> |
| <FONT color="green">237</FONT> }<a name="line.237"></a> |
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| </PRE> |
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