hg/bck2brwsr: javaquery/api/src/main/java/org/apidesign/bck2brwsr/htmlpage/PageProcessor.java@14268cd404a4

     1 /**

     2  * Back 2 Browser Bytecode Translator

     3  * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>

     4  *

     5  * This program is free software: you can redistribute it and/or modify

     6  * it under the terms of the GNU General Public License as published by

     7  * the Free Software Foundation, version 2 of the License.

     8  *

     9  * This program is distributed in the hope that it will be useful,

    10  * but WITHOUT ANY WARRANTY; without even the implied warranty of

    11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    12  * GNU General Public License for more details.

    13  *

    14  * You should have received a copy of the GNU General Public License

    15  * along with this program. Look for COPYING file in the top folder.

    16  * If not, see http://opensource.org/licenses/GPL-2.0.

    17  */

    18 package org.apidesign.bck2brwsr.htmlpage;

    20 import java.io.IOException;

    21 import java.io.InputStream;

    22 import java.io.OutputStreamWriter;

    23 import java.io.Writer;

    24 import java.util.ArrayList;

    25 import java.util.Collection;

    26 import java.util.Collections;

    27 import java.util.List;

    28 import java.util.Locale;

    29 import java.util.Set;

    30 import javax.annotation.processing.AbstractProcessor;

    31 import javax.annotation.processing.Completion;

    32 import javax.annotation.processing.Completions;

    33 import javax.annotation.processing.Processor;

    34 import javax.annotation.processing.RoundEnvironment;

    35 import javax.annotation.processing.SupportedAnnotationTypes;

    36 import javax.lang.model.element.AnnotationMirror;

    37 import javax.lang.model.element.Element;

    38 import javax.lang.model.element.ElementKind;

    39 import javax.lang.model.element.ExecutableElement;

    40 import javax.lang.model.element.Modifier;

    41 import javax.lang.model.element.PackageElement;

    42 import javax.lang.model.element.TypeElement;

    43 import javax.lang.model.element.VariableElement;

    44 import javax.lang.model.type.MirroredTypeException;

    45 import javax.lang.model.type.TypeMirror;

    46 import javax.tools.Diagnostic;

    47 import javax.tools.FileObject;

    48 import javax.tools.StandardLocation;

    49 import org.apidesign.bck2brwsr.htmlpage.api.ComputedProperty;

    50 import org.apidesign.bck2brwsr.htmlpage.api.On;

    51 import org.apidesign.bck2brwsr.htmlpage.api.Page;

    52 import org.apidesign.bck2brwsr.htmlpage.api.Property;

    53 import org.openide.util.lookup.ServiceProvider;

    55 /** Annotation processor to process an XHTML page and generate appropriate

    56  * "id" file.

    57  *

    58  * @author Jaroslav Tulach <jtulach@netbeans.org>

    59  */

    60 @ServiceProvider(service=Processor.class)

    61 @SupportedAnnotationTypes({

    62     "org.apidesign.bck2brwsr.htmlpage.api.Page",

    63     "org.apidesign.bck2brwsr.htmlpage.api.On"

    64 })

    65 public final class PageProcessor extends AbstractProcessor {

    66     @Override

    67     public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {

    68         for (Element e : roundEnv.getElementsAnnotatedWith(Page.class)) {

    69             Page p = e.getAnnotation(Page.class);

    70             PackageElement pe = (PackageElement)e.getEnclosingElement();

    71             String pkg = pe.getQualifiedName().toString();

    73             ProcessPage pp;

    74             try {

    75                 InputStream is = openStream(pkg, p.xhtml());

    76                 pp = ProcessPage.readPage(is);

    77                 is.close();

    78             } catch (IOException iOException) {

    79                 processingEnv.getMessager().printMessage(Diagnostic.Kind.ERROR, "Can't read " + p.xhtml(), e);

    80                 return false;

    81             }

    82             Writer w;

    83             String className = p.className();

    84             if (className.isEmpty()) {

    85                 int indx = p.xhtml().indexOf('.');

    86                 className = p.xhtml().substring(0, indx);

    87             }

    88             try {

    89                 FileObject java = processingEnv.getFiler().createSourceFile(pkg + '.' + className, e);

    90                 w = new OutputStreamWriter(java.openOutputStream());

    91                 try {

    92                     w.append("package " + pkg + ";\n");

    93                     w.append("import org.apidesign.bck2brwsr.htmlpage.api.*;\n");

    94                     w.append("class ").append(className).append(" {\n");

    95                     for (String id : pp.ids()) {

    96                         String tag = pp.tagNameForId(id);

    97                         String type = type(tag);

    98                         w.append("  ").append("public static final ").

    99                             append(type).append(' ').append(cnstnt(id)).append(" = new ").

   100                             append(type).append("(\"").append(id).append("\");\n");

   101                     }

   102                     w.append("  static {\n");

   103                     if (!initializeOnClick((TypeElement) e, w, pp)) {

   104                         return false;

   105                     }

   106                     w.append("  }\n");

   107                     generateProperties(w, p.properties());

   108                     generateComputedProperties(w, e.getEnclosedElements());

   109                     w.append("}\n");

   110                 } finally {

   111                     w.close();

   112                 }

   113             } catch (IOException ex) {

   114                 processingEnv.getMessager().printMessage(Diagnostic.Kind.ERROR, "Can't create " + className + ".java", e);

   115                 return false;

   116             }

   117         }

   118         return true;

   119     }

   121     private InputStream openStream(String pkg, String name) throws IOException {

   122         try {

   123             FileObject fo = processingEnv.getFiler().getResource(

   124                 StandardLocation.SOURCE_PATH, pkg, name);

   125             return fo.openInputStream();

   126         } catch (IOException ex) {

   127             return processingEnv.getFiler().getResource(StandardLocation.CLASS_OUTPUT, pkg, name).openInputStream();

   128         }

   129     }

   131     private static String type(String tag) {

   132         if (tag.equals("title")) {

   133             return "Title";

   134         }

   135         if (tag.equals("button")) {

   136             return "Button";

   137         }

   138         if (tag.equals("input")) {

   139             return "Input";

   140         }

   141         return "Element";

   142     }

   144     private static String cnstnt(String id) {

   145         return id.toUpperCase(Locale.ENGLISH).replace('.', '_');

   146     }

   148     private boolean initializeOnClick(TypeElement type, Writer w, ProcessPage pp) throws IOException {

   149         TypeMirror stringType = processingEnv.getElementUtils().getTypeElement("java.lang.String").asType();

   150         { //for (Element clazz : pe.getEnclosedElements()) {

   151           //  if (clazz.getKind() != ElementKind.CLASS) {

   152             //    continue;

   153            // }

   154             for (Element method : type.getEnclosedElements()) {

   155                 On oc = method.getAnnotation(On.class);

   156                 if (oc != null) {

   157                     for (String id : oc.id()) {

   158                         if (pp.tagNameForId(id) == null) {

   159                             processingEnv.getMessager().printMessage(Diagnostic.Kind.ERROR, "id = " + id + " does not exist in the HTML page. Found only " + pp.ids(), method);

   160                             return false;

   161                         }

   162                         ExecutableElement ee = (ExecutableElement)method;

   163                         boolean hasParam;

   164                         if (ee.getParameters().isEmpty()) {

   165                             hasParam = false;

   166                         } else {

   167                             if (ee.getParameters().size() != 1 || ee.getParameters().get(0).asType() != stringType) {

   168                                 processingEnv.getMessager().printMessage(Diagnostic.Kind.ERROR, "@On method should either have no arguments or one String argument", ee);

   169                                 return false;

   170                             }

   171                             hasParam = true;

   172                         }

   173                         if (!ee.getModifiers().contains(Modifier.STATIC)) {

   174                             processingEnv.getMessager().printMessage(Diagnostic.Kind.ERROR, "@On method has to be static", ee);

   175                             return false;

   176                         }

   177                         if (ee.getModifiers().contains(Modifier.PRIVATE)) {

   178                             processingEnv.getMessager().printMessage(Diagnostic.Kind.ERROR, "@On method can't be private", ee);

   179                             return false;

   180                         }

   181                         w.append("  OnEvent." + oc.event()).append(".of(").append(cnstnt(id)).

   182                             append(").perform(new Runnable() { public void run() {\n");

   183                         w.append("    ").append(type.getSimpleName().toString()).

   184                             append('.').append(ee.getSimpleName()).append("(");

   185                         if (hasParam) {

   186                             w.append("\"").append(id).append("\"");

   187                         }

   188                         w.append(");\n");

   189                         w.append("  }});\n");

   190                     }

   191                 }

   192             }

   193         }

   194         return true;

   195     }

   197     @Override

   198     public Iterable<? extends Completion> getCompletions(

   199         Element element, AnnotationMirror annotation,

   200         ExecutableElement member, String userText

   201     ) {

   202         if (!userText.startsWith("\"")) {

   203             return Collections.emptyList();

   204         }

   206         Element cls = findClass(element);

   207         Page p = cls.getAnnotation(Page.class);

   208         PackageElement pe = (PackageElement) cls.getEnclosingElement();

   209         String pkg = pe.getQualifiedName().toString();

   210         ProcessPage pp;

   211         try {

   212             InputStream is = openStream(pkg, p.xhtml());

   213             pp = ProcessPage.readPage(is);

   214             is.close();

   215         } catch (IOException iOException) {

   216             return Collections.emptyList();

   217         }

   219         List<Completion> cc = new ArrayList<Completion>();

   220         userText = userText.substring(1);

   221         for (String id : pp.ids()) {

   222             if (id.startsWith(userText)) {

   223                 cc.add(Completions.of("\"" + id + "\"", id));

   224             }

   225         }

   226         return cc;

   227     }

   229     private static Element findClass(Element e) {

   230         if (e == null) {

   231             return null;

   232         }

   233         Page p = e.getAnnotation(Page.class);

   234         if (p != null) {

   235             return e;

   236         }

   237         return e.getEnclosingElement();

   238     }

   240     private static void generateProperties(Writer w, Property[] properties) throws IOException {

   241         for (Property p : properties) {

   242             String[] gs = toGetSet(p.name(), null);

   244             final String tn = typeName(p);

   245             w.write("private static " + tn + " prop_" + p.name() + ";\n");

   246             w.write("public static " + tn + " " + gs[0] + "() {\n");

   247             w.write("  return prop_" + p.name() + ";\n");

   248             w.write("}\n");

   249             w.write("public static void " + gs[1] + "(" + tn + " v) {\n");

   250             w.write("  prop_" + p.name() + " = v;\n");

   251             w.write("}\n");

   252         }

   253     }

   255     private void generateComputedProperties(Writer w, Collection<? extends Element> arr) throws IOException {

   256         for (Element e : arr) {

   257             if (e.getKind() != ElementKind.METHOD) {

   258                 continue;

   259             }

   260             if (e.getAnnotation(ComputedProperty.class) == null) {

   261                 continue;

   262             }

   263             ExecutableElement ee = (ExecutableElement)e;

   264             String[] gs = toGetSet(ee.getSimpleName().toString(), null);

   266             final String tn = ee.getReturnType().toString();

   267             w.write("public static " + tn + " " + gs[0] + "() {\n");

   268             w.write("  return " + e.getEnclosingElement().getSimpleName() + '.' + e.getSimpleName() + "(");

   269             String sep = "";

   270             for (VariableElement pe : ee.getParameters()) {

   271                 String[] call = toGetSet(pe.getSimpleName().toString(), null);

   272                 w.write(sep);

   273                 w.write(call[0] + "()");

   274                 sep = ", ";

   275             }

   276             w.write(");\n");

   277             w.write("}\n");

   278         }

   279     }

   281     private static String[] toGetSet(String name, Object type) {

   282         String n = Character.toUpperCase(name.charAt(0)) + name.substring(1);

   283 //        if (p.type() == boolean.class) {

   284 //            return new String[] { "is" + n, "set" + n };

   285 //        } else {

   286         return new String[]{"get" + n, "set" + n};

   287 //        }

   288     }

   290     private static String typeName(Property p) {

   291         try {

   292             return p.type().getName();

   293         } catch (MirroredTypeException ex) {

   294             if (ex.getTypeMirror().getKind().isPrimitive()) {

   295                 return ex.getTypeMirror().toString();

   296             }

   297             throw ex;

   298         }

   299     }

   300 }

author	Jaroslav Tulach <jaroslav.tulach@apidesign.org>
	Sun, 20 Jan 2013 14:29:10 +0100
branch	model
changeset 491	14268cd404a4
parent 490	e089ef6785c0
child 492	854286e49061
permissions	-rw-r--r--