Some gString/closure transpilation fixing, moving groovy util, and star imports.

web-views/src/main/java/groowt/view/web/ast/NodeUtil.java

@@ -1,16 +1,19 @@
 package groowt.view.web.ast;
 
 import groowt.view.web.antlr.TokenList;
+import groowt.view.web.ast.extension.NodeExtension;
 import groowt.view.web.ast.node.LeafNode;
 import groowt.view.web.ast.node.Node;
 import groowt.view.web.ast.node.TreeNode;
 import org.jetbrains.annotations.Nullable;
 
 import java.util.List;
+import java.util.Objects;
 
 public final class NodeUtil {
 
     public static boolean isAnyOfType(Node subject, Class<?>... nodeTypes) {
+        Objects.requireNonNull(subject);
         for (final var type : nodeTypes) {
             if (type.isAssignableFrom(subject.getClass())) {
                 return true;
@@ -19,7 +22,19 @@ public final class NodeUtil {
         return false;
     }
 
+    @SuppressWarnings("unchecked")
+    public static boolean hasExtensionOfType(Node subject, Class<?>... extensionTypes) {
+        Objects.requireNonNull(subject);
+        for (final var extensionType : extensionTypes) {
+            if (subject.hasExtension((Class<? extends NodeExtension>) extensionType)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
     public static boolean isAnyOfType(Node subject, List<Class<? extends Node>> nodeTypes) {
+        Objects.requireNonNull(subject);
         for (final var type : nodeTypes) {
             if (type.isAssignableFrom(subject.getClass())) {
                 return true;

web-views/src/main/java/groowt/view/web/ast/node/ClosureValueNode.java

@@ -38,7 +38,7 @@ public class ClosureValueNode extends AbstractLeafNode implements ValueNode {
     }
 
     protected String toValidGroovyCode(List<Token> groovyTokens) {
-        return "{ " + groovyTokens.stream().map(Token::getText).collect(Collectors.joining()) + "\n}";
+        return "def c = { " + groovyTokens.stream().map(Token::getText).collect(Collectors.joining()) + "\n}";
     }
 
     public GroovyCodeNodeExtension getGroovyCode() {

web-views/src/main/java/groowt/view/web/transpile/DefaultComponentTranspiler.java

@@ -4,9 +4,9 @@ import groowt.view.component.context.ComponentResolveException;
 import groowt.view.component.runtime.ComponentCreateException;
 import groowt.view.web.WebViewComponentBugError;
 import groowt.view.web.ast.node.*;
+import groowt.view.web.transpile.groovy.GroovyUtil;
+import groowt.view.web.transpile.groovy.GroovyUtil.ConvertResult;
 import groowt.view.web.transpile.resolve.ComponentClassNodeResolver;
-import groowt.view.web.transpile.util.GroovyUtil;
-import groowt.view.web.transpile.util.GroovyUtil.ConvertResult;
 import groowt.view.web.util.Provider;
 import groowt.view.web.util.SourcePosition;
 import org.codehaus.groovy.ast.*;
@@ -353,14 +353,8 @@ public class DefaultComponentTranspiler implements ComponentTranspiler {
     ) {
         final var createArgs = new ArgumentListExpression();
         
-        final VariableExpression resolvedVariableExpression;
+        final VariableExpression currentResolved = state.getCurrentResolved();
-        final Variable currentResolved = state.getCurrentResolved();
+        createArgs.addExpression(currentResolved);
-        if (currentResolved instanceof VariableExpression) {
-            resolvedVariableExpression = (VariableExpression) currentResolved;
-        } else {
-            resolvedVariableExpression = new VariableExpression(currentResolved);
-        }
-        createArgs.addExpression(resolvedVariableExpression);
 
         final List<AttrNode> attrNodes = componentNode.getArgs().getAttributes();
         if (attrNodes.isEmpty()) {

web-views/src/main/java/groowt/view/web/transpile/DefaultGStringTranspiler.java

@@ -8,7 +8,7 @@ import groowt.view.web.ast.extension.GStringScriptletExtension;
 import groowt.view.web.ast.node.GStringBodyTextNode;
 import groowt.view.web.ast.node.JStringBodyTextNode;
 import groowt.view.web.ast.node.Node;
-import groowt.view.web.transpile.util.GroovyUtil;
+import groowt.view.web.transpile.groovy.GroovyUtil;
 import groowt.view.web.util.FilteringIterable;
 import groowt.view.web.util.Option;
 import groowt.view.web.util.TokenRange;
@@ -46,15 +46,11 @@ public class DefaultGStringTranspiler implements GStringTranspiler {
         }
     }
 
-    protected Option<ConstantExpression> checkNextAfterDollar(Node current, @Nullable Node next) {
+    protected Option<ConstantExpression> checkNextAfterDollar(@Nullable Node next) {
-        if (!(next instanceof JStringBodyTextNode)) {
+        if (next != null && next.hasExtension(GStringNodeExtension.class)) {
             return Option.liftLazy(() -> {
                 final ConstantExpression expression = this.jStringTranspiler.createEmptyStringLiteral();
-                if (next != null) {
                 this.positionSetter.setToStartOf(expression, next);
-                } else {
-                    this.positionSetter.setToStartOf(expression, current);
-                }
                 return expression;
             });
         } else {
@@ -114,13 +110,13 @@ public class DefaultGStringTranspiler implements GStringTranspiler {
             return new PathResult(
                     propertyExpression,
                     this.checkPrevBeforeDollar(prev, current),
-                    this.checkNextAfterDollar(current, next)
+                    this.checkNextAfterDollar(next)
             );
         } else {
             return new PathResult(
                     begin,
                     this.checkPrevBeforeDollar(prev, current),
-                    this.checkNextAfterDollar(current, next)
+                    this.checkNextAfterDollar(next)
             );
         }
     }
@@ -187,13 +183,13 @@ public class DefaultGStringTranspiler implements GStringTranspiler {
                     case GStringScriptletExtension scriptlet -> {
                         checkPrevBeforeDollar(prev, current).ifPresent(texts::add);
                         values.add(this.handleScriptlet(scriptlet));
-                        checkNextAfterDollar(current, next).ifPresent(texts::add);
+                        checkNextAfterDollar(next).ifPresent(texts::add);
                     }
                 }
             }
         }
 
-        if (texts.size() != values.size() + 1) {
+        if (!(texts.size() == values.size() || texts.size() == values.size() + 1)) {
             throw new IllegalStateException(
                     "incorrect amount of texts vs. values: " + texts.size() + " " + values.size()
             );

web-views/src/main/java/groowt/view/web/transpile/DefaultGroovyTranspiler.java

@@ -11,8 +11,8 @@ import groowt.view.web.compiler.MultipleWebViewComponentCompileErrorsException;
 import groowt.view.web.compiler.WebViewComponentTemplateCompileException;
 import groowt.view.web.compiler.WebViewComponentTemplateCompileUnit;
 import groowt.view.web.runtime.DefaultWebViewRenderContext;
+import groowt.view.web.transpile.groovy.GroovyUtil;
 import groowt.view.web.transpile.resolve.ClassLoaderComponentClassNodeResolver;
-import groowt.view.web.transpile.util.GroovyUtil;
 import org.codehaus.groovy.ast.*;
 import org.codehaus.groovy.ast.expr.*;
 import org.codehaus.groovy.ast.stmt.BlockStatement;

web-views/src/main/java/groowt/view/web/transpile/DefaultValueNodeTranspiler.java

@@ -1,18 +1,20 @@
 package groowt.view.web.transpile;
 
+import groowt.view.web.WebViewComponentBugError;
 import groowt.view.web.ast.node.*;
 import groowt.view.web.transpile.TranspilerUtil.TranspilerState;
-import groowt.view.web.transpile.util.GroovyUtil;
+import groowt.view.web.transpile.groovy.GroovyUtil;
-import groowt.view.web.transpile.util.GroovyUtil.ConvertResult;
+import groowt.view.web.transpile.groovy.GroovyUtil.ConvertResult;
 import org.codehaus.groovy.ast.Parameter;
-import org.codehaus.groovy.ast.expr.ClosureExpression;
+import org.codehaus.groovy.ast.expr.*;
-import org.codehaus.groovy.ast.expr.ConstantExpression;
-import org.codehaus.groovy.ast.expr.Expression;
 import org.codehaus.groovy.ast.stmt.BlockStatement;
 import org.codehaus.groovy.ast.stmt.EmptyStatement;
 import org.codehaus.groovy.ast.stmt.ExpressionStatement;
+import org.codehaus.groovy.ast.stmt.Statement;
 import org.jetbrains.annotations.Nullable;
 
+import java.util.List;
+
 import static groowt.view.web.transpile.TranspilerUtil.getStringLiteral;
 
 // TODO: set positions
@@ -24,16 +26,36 @@ public class DefaultValueNodeTranspiler implements ValueNodeTranspiler {
         this.componentTranspiler = componentTranspiler;
     }
 
-    protected ClosureExpression closureValue(ClosureValueNode closureValueNode) {
+    // TODO: positions
+    protected Expression handleClosureNode(ClosureValueNode closureValueNode) {
         final var rawCode = closureValueNode.getGroovyCode().getAsValidGroovyCode();
-        final ConvertResult convertResult = GroovyUtil.convert(rawCode);
+        final ClosureExpression convertedClosure = GroovyUtil.getClosure(rawCode);
-        final @Nullable BlockStatement blockStatement = convertResult.blockStatement();
+        final Statement closureCode = convertedClosure.getCode();
-        if (blockStatement == null || blockStatement.isEmpty()) {
+        if (closureCode instanceof BlockStatement blockStatement) {
-            throw new IllegalStateException("block statement is null or empty");
+            final List<Statement> statements = blockStatement.getStatements();
+            if (statements.isEmpty()) {
+                throw new WebViewComponentBugError(new IllegalArgumentException(
+                        "Did not expect ClosureValueNode to produce no statements."
+                ));
+            } else if (statements.size() == 1) {
+                final Statement statement = statements.getFirst();
+                if (statement instanceof ExpressionStatement expressionStatement) {
+                    final Expression expression = expressionStatement.getExpression();
+                    return switch (expression) {
+                        case ConstantExpression ignored -> expression;
+                        case VariableExpression ignored -> expression;
+                        case PropertyExpression ignored -> expression;
+                        default -> convertedClosure;
+                    };
+                } else {
+                    throw new IllegalArgumentException("A component closure value must produce a value.");
+                }
+            } else {
+                return convertedClosure;
+            }
+        } else {
+            return convertedClosure;
         }
-        final ExpressionStatement exprStmt = (ExpressionStatement) blockStatement.getStatements().getFirst();
-        // TODO: set pos
-        return (ClosureExpression) exprStmt.getExpression();
     }
 
     private Expression gStringValue(GStringValueNode gStringValueNode) {
@@ -69,7 +91,7 @@ public class DefaultValueNodeTranspiler implements ValueNodeTranspiler {
     @Override
     public Expression createExpression(ValueNode valueNode, TranspilerState state) {
         return switch (valueNode) {
-            case ClosureValueNode closureValueNode -> this.closureValue(closureValueNode);
+            case ClosureValueNode closureValueNode -> this.handleClosureNode(closureValueNode);
             case GStringValueNode gStringValueNode -> this.gStringValue(gStringValueNode);
             case JStringValueNode jStringValueNode -> this.jStringValue(jStringValueNode);
             case EmptyClosureValueNode emptyClosureValueNode -> this.emptyClosureValue(emptyClosureValueNode);

web-views/src/main/java/groowt/view/web/transpile/WebViewComponentModuleNode.java

@@ -1,5 +1,6 @@
 package groowt.view.web.transpile;
 
+import org.codehaus.groovy.ast.AnnotationNode;
 import org.codehaus.groovy.ast.ClassNode;
 import org.codehaus.groovy.ast.ImportNode;
 import org.codehaus.groovy.ast.ModuleNode;
@@ -55,9 +56,16 @@ public class WebViewComponentModuleNode extends ModuleNode {
                 .orElse(null);
     }
 
+    /**
+     * @param alias the name of interest
+     * @return a standard (non-static, non-star) import, or {@code null} if there is none
+     */
     @Override
     public @Nullable ImportNode getImport(String alias) {
-        return this.allImports.get(alias);
+        return this.imports.stream()
+                .filter(importNode -> importNode.getAlias().equals(alias))
+                .findFirst()
+                .orElse(null);
     }
 
     protected void putToAll(String alias, ImportNode importNode) {
@@ -88,4 +96,52 @@ public class WebViewComponentModuleNode extends ModuleNode {
         this.putToAll(alias, importNode);
     }
 
+    @Override
+    public void addImport(String alias, ClassNode type) {
+        this.addImport(new ImportNode(type, alias));
+    }
+
+    @Override
+    public void addImport(String alias, ClassNode type, List<AnnotationNode> annotations) {
+        final var importNode = new ImportNode(type, alias);
+        importNode.addAnnotations(annotations);
+        this.addImport(importNode);
+    }
+
+    @Override
+    public void addStarImport(String packageName) {
+        this.addStarImport(new ImportNode(packageName));
+    }
+
+    @Override
+    public void addStarImport(String packageName, List<AnnotationNode> annotations) {
+        final var importNode = new ImportNode(packageName);
+        importNode.addAnnotations(annotations);
+        this.addStarImport(importNode);
+    }
+
+    @Override
+    public void addStaticImport(ClassNode type, String fieldName, String alias) {
+        this.addStaticImport(alias, new ImportNode(type, fieldName, alias));
+    }
+
+    @Override
+    public void addStaticImport(ClassNode type, String fieldName, String alias, List<AnnotationNode> annotations) {
+        final var importNode = new ImportNode(type, fieldName, alias);
+        importNode.addAnnotations(annotations);
+        this.addStaticImport(alias, importNode);
+    }
+
+    @Override
+    public void addStaticStarImport(String name, ClassNode type) {
+        this.addStaticStarImport(name, new ImportNode(type, name));
+    }
+
+    @Override
+    public void addStaticStarImport(String name, ClassNode type, List<AnnotationNode> annotations) {
+        final var importNode = new ImportNode(type, name);
+        importNode.addAnnotations(annotations);
+        this.addStaticStarImport(name, importNode);
+    }
+
 }

web-views/src/main/java/groowt/view/web/transpile/groovy/GroovyPrettyPrinter.java

@@ -1,4 +1,4 @@
-package groowt.view.web.transpile.util;
+package groowt.view.web.transpile.groovy;
 
 import org.codehaus.groovy.ast.*;
 import org.codehaus.groovy.ast.expr.*;

web-views/src/main/java/groowt/view/web/transpile/groovy/GroovyUtil.java

@@ -1,11 +1,15 @@
-package groowt.view.web.transpile.util;
+package groowt.view.web.transpile.groovy;
 
 import groovy.lang.GroovyCodeSource;
+import groowt.view.web.WebViewComponentBugError;
 import org.codehaus.groovy.ast.ASTNode;
 import org.codehaus.groovy.ast.ClassNode;
 import org.codehaus.groovy.ast.ModuleNode;
 import org.codehaus.groovy.ast.builder.AstStringCompiler;
+import org.codehaus.groovy.ast.expr.BinaryExpression;
+import org.codehaus.groovy.ast.expr.ClosureExpression;
 import org.codehaus.groovy.ast.stmt.BlockStatement;
+import org.codehaus.groovy.ast.stmt.ExpressionStatement;
 import org.codehaus.groovy.control.CompilationUnit;
 import org.codehaus.groovy.control.CompilePhase;
 import org.codehaus.groovy.control.CompilerConfiguration;
@@ -97,6 +101,28 @@ public final class GroovyUtil {
         return new ConvertResult(moduleNode, blockStatement, scriptClassNode, classNodes);
     }
 
+    /**
+     * @param source must be of form {@code def c = { ... }} and the closure must not be empty.
+     * @return the block inside the closure
+     */
+    public static ClosureExpression getClosure(String source) {
+        final ConvertResult convertResult = convert(source);
+        final BlockStatement blockStatement = convertResult.blockStatement();
+        if (blockStatement == null) {
+            throw new WebViewComponentBugError(new IllegalArgumentException(
+                    "Did not expect the source to produce no BlockStatement."
+            ));
+        }
+        if (blockStatement.isEmpty()) {
+            throw new WebViewComponentBugError(new IllegalArgumentException(
+                    "Did not expect the BlockStatement to be empty."
+            ));
+        }
+        final ExpressionStatement exprStmt = (ExpressionStatement) blockStatement.getStatements().getFirst();
+        final BinaryExpression binaryExpression = (BinaryExpression) exprStmt.getExpression();
+        return (ClosureExpression) binaryExpression.getRightExpression();
+    }
+
     private GroovyUtil() {}
 
 }

web-views/src/main/java/groowt/view/web/transpile/groovy/GroovyUtil.kt

@@ -1,4 +1,4 @@
-package groowt.view.web.transpile.util
+package groowt.view.web.transpile.groovy
 
 import org.codehaus.groovy.ast.ASTNode
 

web-views/src/main/java/groowt/view/web/transpile/resolve/ModuleNodeComponentClassNodeResolver.java

@@ -20,18 +20,34 @@ public class ModuleNodeComponentClassNodeResolver extends CachingComponentClassN
     @Override
     public Either<ClassNodeResolveException, ClassNode> getClassForNameWithoutPackage(String nameWithoutPackage) {
         return super.getClassForNameWithoutPackage(nameWithoutPackage).flatMapLeft(ignored -> {
-            // try imports first
+            // try regular imports first
             final var importedClassNode = this.moduleNode.getImportType(nameWithoutPackage);
             if (importedClassNode != null) {
                 this.addClassNode(importedClassNode);
                 return Either.right(importedClassNode);
             }
 
+            // try star imports
+            final var starImports = this.moduleNode.getStarImports();
+            for (final var starImport : starImports) {
+                final var packageName = starImport.getPackageName();
+                final String fqn;
+                if (packageName.endsWith(".")) {
+                    fqn = packageName + nameWithoutPackage;
+                } else {
+                    fqn = packageName + "." + nameWithoutPackage;
+                }
+                final var withPackage = this.getClassForFqn(fqn);
+                if (withPackage.isRight()) {
+                    return withPackage;
+                }
+            }
+
             // try pre-pending package and asking for fqn
             final var packageName = this.moduleNode.getPackageName();
             final String fqn;
             if (packageName.endsWith(".")) {
-                fqn = this.moduleNode + nameWithoutPackage;
+                fqn = this.moduleNode.getPackageName() + nameWithoutPackage;
             } else {
                 fqn = this.moduleNode.getPackageName() + "." + nameWithoutPackage;
             }

web-views/src/test/groovy/groowt/view/web/BaseWebViewComponentTests.groovy

@@ -7,17 +7,13 @@ class BaseWebViewComponentTests extends AbstractWebViewComponentTests {
 
     static final class Greeter extends BaseWebViewComponent {
 
-        private final String target
+        final String target
 
         Greeter(Map<String, Object> attr) {
             super('Hello, $target!')
             this.target = Objects.requireNonNull(attr.get("target"))
         }
 
-        String getTarget() {
-            return this.target
-        }
-
     }
 
     static final class UsingGreeter extends BaseWebViewComponent {

web-views/src/test/groovy/groowt/view/web/SimpleWebViewComponentTests.groovy

@@ -0,0 +1,51 @@
+package groowt.view.web
+
+import groowt.view.web.lib.AbstractWebViewComponentTests
+import org.junit.jupiter.api.Test
+
+class SimpleWebViewComponentTests extends AbstractWebViewComponentTests {
+
+    @Test
+    void closureValueWithConstantExpressionEvaluatesToValue() {
+        this.doTest('<Echo greeting={"Hello, World!"}>$greeting</Echo>', 'Hello, World!')
+    }
+
+    @Test
+    void closureValueWithVariableExpressionEvaluatesToValue() {
+        this.doTest(
+                '<Echo greeting="Hello, World!"><Echo subGreeting={greeting}>$subGreeting</Echo></Echo>',
+                'Hello, World!'
+        )
+    }
+
+    @Test
+    void closureWithPropertyExpressionEvaluatesToValue() {
+        this.doTest(
+                '''
+                ---
+                import groovy.transform.Field
+                
+                @Field
+                Map greetings = [hello: 'Hello!']
+                ---
+                <Echo greeting={greetings.hello}>$greeting</Echo>
+                '''.stripIndent().trim(),
+                'Hello!'
+        )
+    }
+
+    @Test
+    void closureWithMethodCallIsClosure() {
+        this.doTest(
+                '''
+                ---
+                def helper(String input) {
+                    input.capitalize()
+                }
+                ---
+                <Echo subHelper={ helper('lowercase') }>${ -> subHelper.call() }</Echo>
+                '''.stripIndent().trim(), 'Lowercase'
+        )
+    }
+
+}

web-views/src/tools/groovy/groowt/view/web/tools/inspectNodes.groovy

@@ -1,9 +1,9 @@
 package groowt.view.web.tools
 
-import groowt.view.web.transpile.util.GroovyUtil
+import groowt.view.web.transpile.groovy.GroovyUtil
 import org.codehaus.groovy.ast.ImportNode
 
-import static groowt.view.web.transpile.util.GroovyUtil.formatGroovy
+import static groowt.view.web.transpile.groovy.GroovyUtil.formatGroovy
 
 def src = '''
 import some.Thing