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src/jdk.jextract/share/classes/com/sun/tools/jextract/TreeFilter.java

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  26 import java.nio.file.Paths;
  27 import java.util.ArrayList;
  28 import java.util.List;
  29 import java.util.function.Predicate;
  30 import java.util.stream.Collectors;
  31 import com.sun.tools.jextract.parser.Parser;
  32 import com.sun.tools.jextract.tree.FunctionTree;
  33 import com.sun.tools.jextract.tree.HeaderTree;
  34 import com.sun.tools.jextract.tree.MacroTree;
  35 import com.sun.tools.jextract.tree.SimpleTreeVisitor;
  36 import com.sun.tools.jextract.tree.Tree;
  37 import com.sun.tools.jextract.tree.TreePhase;
  38 import com.sun.tools.jextract.tree.VarTree;
  39 import com.sun.tools.jextract.tree.TreeMaker;
  40 import com.sun.tools.jextract.tree.TreePrinter;
  41 
  42 /**
  43  * This visitor filters variable, function, macro trees
  44  * based on a Tree Predicate initialized.
  45  */
  46 final class TreeFilter extends SimpleTreeVisitor<Tree, Void>
  47         implements TreePhase {
  48     private final TreeMaker treeMaker = new TreeMaker();
  49     private final Predicate<Tree> filter;
  50 
  51     TreeFilter(Predicate<Tree> filter) {
  52         this.filter = filter;
  53     }
  54 
  55     private Tree filterTree(Tree tree) {
  56         return filter.test(tree)? tree : null;
  57     }
  58 
  59     @Override
  60     public HeaderTree transform(HeaderTree ht) {
  61         return (HeaderTree)ht.accept(this, null);
  62     }
  63 
  64     @Override
  65     public Tree defaultAction(Tree tree, Void v) {
  66         return tree;
  67     }
  68 
  69     @Override
  70     public Tree visitFunction(FunctionTree ft, Void v) {
  71         return filterTree(ft);
  72     }
  73 
  74     @Override
  75     public Tree visitMacro(MacroTree mt, Void v) {
  76         return filterTree(mt);
  77     }
  78 
  79     @Override
  80     public Tree visitHeader(HeaderTree ht, Void v) {
  81         List<Tree> decls =  ht.declarations().stream().
  82             map(decl -> decl.accept(this, null)).
  83             filter(decl -> decl != null).
  84             collect(Collectors.toList());
  85         return treeMaker.createHeader(ht.cursor(), ht.path(), decls);
  86     }
  87 
  88     @Override
  89     public Tree visitVar(VarTree vt, Void v) {
  90         return filterTree(vt);
  91     }
  92 


  93     // test main to manually check this visitor
  94     // Usage: <header-file> [<regex-for-symbols-to-include>]
  95     public static void main(String[] args) {
  96         if (args.length == 0) {
  97             System.err.println("Expected a header file");
  98             return;
  99         }
 100 
 101         Parser p = new Parser(true);

 102         List<Path> paths = List.of(Paths.get(args[0]));
 103         Path builtinInc = Paths.get(System.getProperty("java.home"), "conf", "jextract");
 104         List<String> clangArgs = List.of("-I" + builtinInc);
 105         List<HeaderTree> headers = p.parse(paths, clangArgs);
 106         TreePrinter printer = new TreePrinter();
 107         Predicate<Tree> nameFilter =  args.length > 1? t->t.name().matches(args[1]) : t->true;
 108         TreeFilter filter = new TreeFilter(nameFilter);





 109         for (HeaderTree ht : headers) {
 110             filter.transform(ht).accept(printer, null);
 111         }
 112     }
 113 }


  26 import java.nio.file.Paths;
  27 import java.util.ArrayList;
  28 import java.util.List;
  29 import java.util.function.Predicate;
  30 import java.util.stream.Collectors;
  31 import com.sun.tools.jextract.parser.Parser;
  32 import com.sun.tools.jextract.tree.FunctionTree;
  33 import com.sun.tools.jextract.tree.HeaderTree;
  34 import com.sun.tools.jextract.tree.MacroTree;
  35 import com.sun.tools.jextract.tree.SimpleTreeVisitor;
  36 import com.sun.tools.jextract.tree.Tree;
  37 import com.sun.tools.jextract.tree.TreePhase;
  38 import com.sun.tools.jextract.tree.VarTree;
  39 import com.sun.tools.jextract.tree.TreeMaker;
  40 import com.sun.tools.jextract.tree.TreePrinter;
  41 
  42 /**
  43  * This visitor filters variable, function, macro trees
  44  * based on a Tree Predicate initialized.
  45  */
  46 abstract class TreeFilter extends SimpleTreeVisitor<Tree, Void>
  47         implements TreePhase {
  48     private final TreeMaker treeMaker = new TreeMaker();





  49 
  50     private Tree filterTree(Tree tree) {
  51         return filter(tree)? tree : null;
  52     }
  53 
  54     @Override
  55     public HeaderTree transform(HeaderTree ht) {
  56         return (HeaderTree)ht.accept(this, null);
  57     }
  58 
  59     @Override
  60     public Tree defaultAction(Tree tree, Void v) {
  61         return tree;
  62     }
  63 
  64     @Override
  65     public Tree visitFunction(FunctionTree ft, Void v) {
  66         return filterTree(ft);
  67     }
  68 
  69     @Override
  70     public Tree visitMacro(MacroTree mt, Void v) {
  71         return filterTree(mt);
  72     }
  73 
  74     @Override
  75     public Tree visitHeader(HeaderTree ht, Void v) {
  76         List<Tree> decls =  ht.declarations().stream().
  77             map(decl -> decl.accept(this, null)).
  78             filter(decl -> decl != null).
  79             collect(Collectors.toList());
  80         return treeMaker.createHeader(ht.cursor(), ht.path(), decls);
  81     }
  82 
  83     @Override
  84     public Tree visitVar(VarTree vt, Void v) {
  85         return filterTree(vt);
  86     }
  87 
  88     abstract boolean filter(Tree tree);
  89 
  90     // test main to manually check this visitor
  91     // Usage: <header-file> [<regex-for-symbols-to-include>]
  92     public static void main(String[] args) {
  93         if (args.length == 0) {
  94             System.err.println("Expected a header file");
  95             return;
  96         }
  97 
  98         Context context = new Context();
  99         Parser p = new Parser(context, true);
 100         List<Path> paths = List.of(Paths.get(args[0]));
 101         Path builtinInc = Paths.get(System.getProperty("java.home"), "conf", "jextract");
 102         List<String> clangArgs = List.of("-I" + builtinInc);
 103         List<HeaderTree> headers = p.parse(paths, clangArgs);
 104         TreePrinter printer = new TreePrinter();
 105         Predicate<Tree> nameFilter =  args.length > 1? t->t.name().matches(args[1]) : t->true;
 106         TreeFilter filter = new TreeFilter() {
 107             @Override
 108             boolean filter(Tree tree) {
 109                 return nameFilter.test(tree);
 110             }
 111         };
 112         for (HeaderTree ht : headers) {
 113             filter.transform(ht).accept(printer, null);
 114         }
 115     }
 116 }
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