GString transpilation: values in correct order, verbatim fixed.

web-views/build.gradle

@@ -144,11 +144,12 @@ def toolSpec = { String name, String mainClass ->
 }
 
 final List<ToolSpec> toolSpecs = [
-        toolSpec('parseTreeFileMaker', 'ParseTreeFileMakerCli'),
         toolSpec('astFileMaker', 'AstFileMakerCli'),
         toolSpec('convertToGroovy', 'ConvertToGroovy'),
         toolSpec('lexer', 'LexerTool'),
-        toolSpec('parser', 'ParserTool')
+        toolSpec('parser', 'ParserTool'),
+        toolSpec('parseTreeFileMaker', 'ParseTreeFileMakerCli'),
+        toolSpec('runTemplate', 'RunTemplate')
 ]
 
 toolSpecs.each { spec ->

web-views/sketching/.gitignore

@@ -1,2 +1,3 @@
 *.groovy
 classes
+.txt

web-views/sketching/preambleHelloTarget.wvc

@@ -1,9 +1,10 @@
 ---
-import groowt.view.component.ComponentContext
+void consume(out) {
-
+    out << 'World'
-class Helper {
-    String greeting
 }
+
+@groovy.transform.Field
+String greeting = 'Hello'
 ---
-Hello, $target!
+$greeting, ${consume(out)}!
 What a nice day.

web-views/src/main/java/groowt/view/web/ast/extension/GStringScriptletExtension.java

@@ -13,9 +13,4 @@ public non-sealed class GStringScriptletExtension extends GStringNodeExtension {
         super(self, allTokens.getRange(rawTokenRange));
     }
 
-    @Override
-    public String getAsValidEmbeddableCode() {
-        return "${" + super.getAsValidEmbeddableCode() + "}";
-    }
-
 }

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

@@ -1,26 +1,46 @@
 package groowt.view.web.ast.node;
 
 import groowt.util.di.annotation.Given;
+import groowt.view.web.antlr.TokenList;
+import groowt.view.web.ast.extension.GroovyCodeNodeExtension;
 import groowt.view.web.ast.extension.NodeExtensionContainer;
 import groowt.view.web.util.TokenRange;
 import jakarta.inject.Inject;
+import org.antlr.v4.runtime.Token;
+
+import java.util.List;
+import java.util.function.Function;
+import java.util.stream.Collectors;
 
 public class PreambleNode extends AbstractLeafNode {
 
-    private final int groovyIndex;
+    private final GroovyCodeNodeExtension groovyCode;
 
     @Inject
     public PreambleNode(
+            TokenList tokenList,
             NodeExtensionContainer extensionContainer,
             @Given TokenRange tokenRange,
             @Given int groovyCodeIndex
     ) {
         super(tokenRange, extensionContainer);
-        this.groovyIndex = groovyCodeIndex;
+        this.groovyCode = this.createGroovyCode(tokenList, groovyCodeIndex);
     }
 
-    public int getGroovyCodeIndex() {
+    protected GroovyCodeNodeExtension createGroovyCode(TokenList tokenList, int groovyCodeIndex) {
-        return this.groovyIndex;
+        return this.createExtension(
+                GroovyCodeNodeExtension.class,
+                TokenRange.fromIndex(tokenList, groovyCodeIndex),
+                (Function<? super List<Token>, String>) this::toValidGroovyCode
+        );
+    }
+
+    protected String toValidGroovyCode(List<Token> tokenList) {
+        return tokenList.stream().map(Token::getText).collect(Collectors.joining());
+    }
+
+    public GroovyCodeNodeExtension getGroovyCode() {
+        return this.groovyCode;
     }
 
 }

web-views/src/main/java/groowt/view/web/runtime/WebViewComponentWriter.java

@@ -24,16 +24,12 @@ public class WebViewComponentWriter {
     }
 
     public void append(GString gString) {
-        final String content;
         try {
-            content = gString.toString();
+            gString.writeTo(this.delegate);
-        } catch (Exception exception) {
-            throw new ComponentRenderException(exception);
-        }
-        try {
-            this.delegate.append(content);
         } catch (IOException ioException) {
             throw new RuntimeException(ioException);
+        } catch (Exception exception) {
+            throw new ComponentRenderException(exception);
         }
     }
 
@@ -79,4 +75,13 @@ public class WebViewComponentWriter {
         }
     }
 
+    public void leftShift(Object object) {
+        switch (object) {
+            case String s -> this.append(s);
+            case GString gs -> this.append(gs);
+            case ViewComponent viewComponent -> this.append(viewComponent);
+            default -> this.append(object);
+        }
+    }
+
 }

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

@@ -8,6 +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.util.FilteringIterable;
 import groowt.view.web.util.Option;
 import groowt.view.web.util.TokenRange;
@@ -15,6 +16,9 @@ import jakarta.inject.Inject;
 import jakarta.inject.Singleton;
 import org.antlr.v4.runtime.Token;
 import org.codehaus.groovy.ast.expr.*;
+import org.codehaus.groovy.ast.stmt.BlockStatement;
+import org.codehaus.groovy.ast.stmt.ExpressionStatement;
+import org.codehaus.groovy.ast.stmt.Statement;
 import org.jetbrains.annotations.Nullable;
 
 import java.util.ArrayList;
@@ -70,7 +74,8 @@ public class DefaultGStringTranspiler implements GStringTranspiler {
     }
 
     protected record PathResult(
-            Expression result, Option<ConstantExpression> before,
+            Expression result,
+            Option<ConstantExpression> before,
             Option<ConstantExpression> after
     ) {}
 
@@ -124,6 +129,23 @@ public class DefaultGStringTranspiler implements GStringTranspiler {
         }
     }
 
+    protected ClosureExpression handleScriptlet(GStringScriptletExtension gStringScriptletExtension) {
+        final GroovyUtil.ConvertResult convertResult = GroovyUtil.convert(
+                "def cl = {" + gStringScriptletExtension.getAsValidEmbeddableCode() + "}"
+        );
+        final BlockStatement convertBlock = convertResult.blockStatement();
+        if (convertBlock == null) {
+            throw new NullPointerException("Did not except convertBlock to be null");
+        }
+        final List<Statement> convertStatements = convertBlock.getStatements();
+        if (convertStatements.size() != 1) {
+            throw new IllegalStateException("Did not expect convertStatements.size() to not equal 1");
+        }
+        final ExpressionStatement convertExpressionStatement = (ExpressionStatement) convertStatements.getFirst();
+        final BinaryExpression assignment = (BinaryExpression) convertExpressionStatement.getExpression();
+        return (ClosureExpression) assignment.getRightExpression();
+    }
+
     @Override
     public GStringExpression createGStringExpression(GStringBodyTextNode gStringBodyTextNode) {
         final var children = gStringBodyTextNode.getChildren();
@@ -136,7 +158,10 @@ public class DefaultGStringTranspiler implements GStringTranspiler {
                 return jStringBodyTextNode.getContent();
             } else if (node.hasExtension(GStringNodeExtension.class)) {
                 final var gString = node.getExtension(GStringNodeExtension.class);
-                return gString.getAsValidEmbeddableCode();
+                return switch (gString) {
+                    case GStringPathExtension ignored -> gString.getAsValidEmbeddableCode();
+                    case GStringScriptletExtension ignored -> "${" + gString.getAsValidEmbeddableCode() + "}";
+                };
             } else {
                 throw new IllegalArgumentException(
                         "Cannot get verbatim text when one of the given parts has "
@@ -165,7 +190,7 @@ public class DefaultGStringTranspiler implements GStringTranspiler {
                     }
                     case GStringScriptletExtension scriptlet -> {
                         checkPrevBeforeDollar(prev, current).ifPresent(texts::add);
-                        // TODO
+                        values.add(this.handleScriptlet(scriptlet));
                         checkNextAfterDollar(current, next).ifPresent(texts::add);
                     }
                 }

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

@@ -3,10 +3,13 @@ package groowt.view.web.transpile;
 import groowt.view.web.antlr.TokenList;
 import groowt.view.web.ast.node.BodyNode;
 import groowt.view.web.ast.node.CompilationUnitNode;
-import groowt.view.web.transpile.PreambleTranspiler.PreambleResult;
+import groowt.view.web.ast.node.PreambleNode;
+import groowt.view.web.transpile.util.GroovyUtil;
 import org.codehaus.groovy.ast.*;
 import org.codehaus.groovy.ast.expr.ClosureExpression;
+import org.codehaus.groovy.ast.expr.DeclarationExpression;
 import org.codehaus.groovy.ast.stmt.BlockStatement;
+import org.codehaus.groovy.ast.stmt.ExpressionStatement;
 import org.codehaus.groovy.ast.stmt.ReturnStatement;
 import org.codehaus.groovy.ast.stmt.Statement;
 import org.codehaus.groovy.control.CompilationUnit;
@@ -14,8 +17,11 @@ import org.codehaus.groovy.control.SourceUnit;
 import org.codehaus.groovy.control.io.ReaderSource;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
-import java.util.concurrent.atomic.AtomicInteger;
+import java.util.ArrayList;
+import java.util.List;
 import java.util.function.Supplier;
 
 import static groowt.view.web.transpile.TranspilerUtil.*;
@@ -30,6 +36,8 @@ import static org.objectweb.asm.Opcodes.ACC_PUBLIC;
  */
 public class DefaultGroovyTranspiler implements GroovyTranspiler {
 
+    private static final Logger logger = LoggerFactory.getLogger(DefaultGroovyTranspiler.class);
+
     private final CompilationUnit groovyCompilationUnit;
     private final String defaultPackageName;
     private final Supplier<? extends TranspilerConfiguration> configurationSupplier;
@@ -60,6 +68,96 @@ public class DefaultGroovyTranspiler implements GroovyTranspiler {
         }
     }
 
+    protected void checkPreambleClasses(String templateName, List<ClassNode> classNodes) {
+        final ClassNode offending = classNodes.stream()
+                .filter(classNode -> classNode.getName().equals(templateName))
+                .findAny()
+                .orElse(null);
+        if (offending != null) {
+            throw new IllegalArgumentException(
+                    templateName + " cannot define itself in the template. " +
+                            "Remove the class with that name."
+            );
+        }
+    }
+
+    protected List<InnerClassNode> convertPreambleClassesToInnerClasses(ClassNode mainClassNode, List<ClassNode> classNodes) {
+        final List<InnerClassNode> result = new ArrayList<>();
+        for (final var classNode : classNodes) {
+            if (classNode instanceof InnerClassNode innerClassNode) {
+                result.add(innerClassNode);
+            } else {
+                final InnerClassNode icn = new InnerClassNode(
+                        mainClassNode,
+                        mainClassNode.getName() + "." + classNode.getNameWithoutPackage(),
+                        classNode.getModifiers(),
+                        classNode.getSuperClass(),
+                        classNode.getInterfaces(),
+                        classNode.getMixins()
+                );
+                icn.setDeclaringClass(mainClassNode);
+            }
+        }
+        return result;
+    }
+
+    protected void handlePreamble(
+            String templateName,
+            String packageName,
+            PreambleNode preambleNode,
+            ClassNode mainClassNode,
+            WebViewComponentModuleNode moduleNode
+    ) {
+        final GroovyUtil.ConvertResult preambleConvert = GroovyUtil.convert(
+                preambleNode.getGroovyCode().getAsValidGroovyCode()
+        );
+
+        WebViewComponentModuleNode.copyTo(preambleConvert.moduleNode(), moduleNode);
+
+        final BlockStatement preambleBlock = preambleConvert.blockStatement();
+        if (preambleBlock != null) {
+            // Fields
+            final List<Statement> preambleStatements = preambleBlock.getStatements();
+            final List<DeclarationExpression> declarationsWithField = preambleStatements.stream()
+                    .filter(statement -> statement instanceof ExpressionStatement)
+                    .map(ExpressionStatement.class::cast)
+                    .map(ExpressionStatement::getExpression)
+                    .filter(expression -> expression instanceof DeclarationExpression)
+                    .map(DeclarationExpression.class::cast)
+                    .filter(declarationExpression ->
+                            !declarationExpression.getAnnotations(FIELD_ANNOTATION).isEmpty()
+                    )
+                    .toList();
+            if (declarationsWithField.size() != preambleStatements.size()) {
+                logger.warn(
+                        "{} contains script statements which are not supported. " +
+                                "Currently, only classes, methods, and field declarations (marked with @Field) " +
+                                "are supported. The rest will be ignored.",
+                        templateName
+                );
+            }
+            declarationsWithField.forEach(declaration -> {
+                declaration.setDeclaringClass(mainClassNode);
+            });
+        }
+
+        // move methods from script class
+        final ClassNode scriptClass = preambleConvert.scriptClass();
+        if (scriptClass != null) {
+            scriptClass.getMethods().forEach(mainClassNode::addMethod);
+        }
+
+        // handle classes
+        final List<ClassNode> classNodes = preambleConvert.classNodes();
+        this.checkPreambleClasses(templateName, classNodes);
+        final List<ClassNode> toInner = classNodes.stream()
+                .filter(classNode -> classNode != preambleConvert.scriptClass())
+                .filter(classNode -> !classNode.isScript())
+                .toList();
+        final List<InnerClassNode> innerClassNodes = this.convertPreambleClassesToInnerClasses(mainClassNode, toInner);
+        innerClassNodes.forEach(moduleNode::addClass);
+    }
+
     // Cases:
     // - no preamble -> create our own class
     // - some preamble, but no script -> create our own class but use imports/packageName from preamble
@@ -85,25 +183,11 @@ public class DefaultGroovyTranspiler implements GroovyTranspiler {
         final var moduleNode = new WebViewComponentModuleNode(sourceUnit);
         sourceUnit.setModuleNode(moduleNode);
 
-        ClassNode mainClassNode;
-
-        final PreambleResult preambleResult = configuration.getPreambleTranspiler().getPreambleResult(
-                compilationUnitNode.getPreambleNode(),
-                templateName,
-                tokens
-        );
-        if (preambleResult.moduleNode() != null) {
-            WebViewComponentModuleNode.copyTo(preambleResult.moduleNode(), moduleNode);
-        }
-        if (preambleResult.scriptClass() != null) {
-            mainClassNode = preambleResult.scriptClass();
-            // do not add it to moduleNode because it's already there
-        } else {
         final String packageName = this.getPackageName(moduleNode);
-            final String templateClassName = packageName + "." + templateName;
+        moduleNode.setPackageName(packageName);
 
-            mainClassNode = new ClassNode(
+        final ClassNode mainClassNode = new ClassNode(
-                    templateClassName,
+                packageName + "." + templateName,
                 ACC_PUBLIC,
                 ClassHelper.OBJECT_TYPE
         );
@@ -111,8 +195,14 @@ public class DefaultGroovyTranspiler implements GroovyTranspiler {
         mainClassNode.addInterface(TranspilerUtil.COMPONENT_TEMPLATE);
 
         moduleNode.addClass(mainClassNode);
+
+        // preamble
+        final PreambleNode preambleNode = compilationUnitNode.getPreambleNode();
+        if (preambleNode != null) {
+            this.handlePreamble(templateName, packageName, preambleNode, mainClassNode, moduleNode);
         }
 
+        // renderer
         final var renderBlock = new BlockStatement();
 
         final TranspilerState state = TranspilerState.withDefaultRootScope();
@@ -138,6 +228,8 @@ public class DefaultGroovyTranspiler implements GroovyTranspiler {
                 },
                 renderBlock
         );
+
+        // getRenderer()
         final Statement returnRendererStmt = new ReturnStatement(renderer);
 
         final var voidClosure = ClassHelper.CLOSURE_TYPE.getPlainNodeReference();

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

@@ -1,32 +0,0 @@
-package groowt.view.web.transpile;
-
-import groowt.view.web.antlr.TokenList;
-import groowt.view.web.ast.node.PreambleNode;
-import groowt.view.web.transpile.util.GroovyUtil;
-import org.antlr.v4.runtime.Token;
-import org.jetbrains.annotations.Nullable;
-
-import java.util.List;
-
-public class DefaultPreambleTranspiler implements PreambleTranspiler {
-
-    @Override
-    public PreambleResult getPreambleResult(
-            @Nullable PreambleNode preambleNode,
-            String templateName,
-            TokenList tokens
-    ) {
-        if (preambleNode == null) {
-            return new PreambleResult(null, null, List.of());
-        } else {
-            final Token groovyToken = tokens.getGroovyToken(preambleNode.getGroovyCodeIndex());
-            final GroovyUtil.ConvertResult convertResult = GroovyUtil.convert(groovyToken.getText(), templateName);
-            return new PreambleResult(
-                    convertResult.moduleNode(),
-                    convertResult.scriptClass(),
-                    convertResult.classNodes()
-            );
-        }
-    }
-
-}

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

@@ -5,7 +5,6 @@ import jakarta.inject.Inject;
 public class DefaultTranspilerConfiguration implements TranspilerConfiguration {
 
     private final OutStatementFactory outStatementFactory = new SimpleOutStatementFactory();
-    private final PreambleTranspiler preambleTranspiler = new DefaultPreambleTranspiler();
     private final BodyTranspiler bodyTranspiler;
 
     @Inject
@@ -20,11 +19,6 @@ public class DefaultTranspilerConfiguration implements TranspilerConfiguration {
         componentTranspiler.setValueNodeTranspiler(valueNodeTranspiler);
     }
 
-    @Override
-    public PreambleTranspiler getPreambleTranspiler() {
-        return this.preambleTranspiler;
-    }
-
     @Override
     public BodyTranspiler getBodyTranspiler() {
         return this.bodyTranspiler;

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

@@ -1,20 +0,0 @@
-package groowt.view.web.transpile;
-
-import groowt.view.web.antlr.TokenList;
-import groowt.view.web.ast.node.PreambleNode;
-import org.codehaus.groovy.ast.ClassNode;
-import org.codehaus.groovy.ast.ModuleNode;
-import org.jetbrains.annotations.Nullable;
-
-import java.util.List;
-
-public interface PreambleTranspiler {
-
-    record PreambleResult(
-            @Nullable ModuleNode moduleNode, @Nullable ClassNode scriptClass,
-            List<ClassNode> allClasses
-    ) {}
-
-    PreambleResult getPreambleResult(@Nullable PreambleNode preambleNode, String templateName, TokenList tokens);
-
-}

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

@@ -1,7 +1,6 @@
 package groowt.view.web.transpile;
 
 public interface TranspilerConfiguration {
-    PreambleTranspiler getPreambleTranspiler();
     BodyTranspiler getBodyTranspiler();
     OutStatementFactory getOutStatementFactory();
 }

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

@@ -1,6 +1,7 @@
 package groowt.view.web.transpile;
 
 import groovy.lang.Tuple2;
+import groovy.transform.Field;
 import groowt.view.component.ComponentContext;
 import groowt.view.component.ComponentTemplate;
 import groowt.view.web.runtime.WebViewComponentWriter;
@@ -18,6 +19,7 @@ public final class TranspilerUtil {
     public static final ClassNode COMPONENT_TEMPLATE = ClassHelper.make(ComponentTemplate.class);
     public static final ClassNode OUT_TYPE = ClassHelper.make(WebViewComponentWriter.class);
     public static final ClassNode CONTEXT_CLASSNODE = ClassHelper.make(ComponentContext.class);
+    public static final ClassNode FIELD_ANNOTATION = ClassHelper.make(Field.class);
 
     public static final String GROOWT_VIEW_WEB = "groowt.view.web";
     public static final String OUT = "out";

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

@@ -14,16 +14,10 @@ import java.util.stream.Collectors;
 public class WebViewComponentModuleNode extends ModuleNode {
 
     public static void copyTo(ModuleNode from, WebViewComponentModuleNode to) {
-        to.setDescription(from.getDescription());
-        to.setPackage(from.getPackage());
-        to.setPackageName(from.getPackageName());
-        to.setImportsResolved(from.hasImportsResolved());
-        to.setMetaDataMap(from.getMetaDataMap());
         from.getImports().forEach(to::addImport);
         from.getStarImports().forEach(to::addStarImport);
         from.getStaticImports().forEach(to::addStaticImport);
         from.getStaticStarImports().forEach(to::addStaticStarImport);
-        from.getClasses().forEach(to::addClass);
     }
 
     protected final List<ImportNode> imports = new ArrayList<>();

web-views/src/test/groovy/groowt/view/web/transpiler/DefaultPreambleTranspilerTests.java

@@ -1,15 +0,0 @@
-package groowt.view.web.transpiler;
-
-import groowt.view.web.transpile.DefaultPreambleTranspiler;
-
-public class DefaultPreambleTranspilerTests extends PreambleTranspilerTests {
-
-    protected static DefaultPreambleTranspiler getDefaultPreambleTranspiler() {
-        return new DefaultPreambleTranspiler();
-    }
-
-    public DefaultPreambleTranspilerTests() {
-        super(getDefaultPreambleTranspiler());
-    }
-
-}

web-views/src/testFixtures/java/groowt/view/web/transpiler/GStringTranspilerTests.java

@@ -4,12 +4,18 @@ import groowt.view.web.antlr.ParserUtil;
 import groowt.view.web.antlr.TokenList;
 import groowt.view.web.ast.DefaultAstBuilder;
 import groowt.view.web.ast.DefaultNodeFactory;
+import groowt.view.web.ast.node.BodyNode;
 import groowt.view.web.ast.node.CompilationUnitNode;
 import groowt.view.web.ast.node.GStringBodyTextNode;
 import groowt.view.web.transpile.GStringTranspiler;
+import org.codehaus.groovy.ast.expr.ClosureExpression;
 import org.codehaus.groovy.ast.expr.GStringExpression;
+import org.codehaus.groovy.ast.expr.VariableExpression;
 import org.junit.jupiter.api.Test;
 
+import java.util.Objects;
+import java.util.function.Consumer;
+
 import static org.junit.jupiter.api.Assertions.*;
 
 public abstract class GStringTranspilerTests {
@@ -23,20 +29,55 @@ public abstract class GStringTranspilerTests {
         });
     }
 
-    @Test
+    protected BodyNode getBodyNode(String source) {
-    public void gStringExpressionWithDollarReference() {
-        final var source = "Hello, $target!";
         final var parseResult = ParserUtil.parseCompilationUnit(source);
         final var tokenList = new TokenList(parseResult.getTokenStream());
         final var nodeFactory = new DefaultNodeFactory(tokenList);
         final var astBuilder = new DefaultAstBuilder(nodeFactory);
         final var cuNode = (CompilationUnitNode) astBuilder.build(parseResult.getCompilationUnitContext());
-        final var bodyNode = cuNode.getBodyNode();
+        return Objects.requireNonNull(cuNode.getBodyNode());
-        assertNotNull(bodyNode);
+    }
-        final var gStringBodyTextNode = bodyNode.getAt(0, GStringBodyTextNode.class);
+
+    protected void doTest(String source, Consumer<GStringExpression> further) {
+        final var gStringBodyTextNode = this.getBodyNode(source).getAt(0, GStringBodyTextNode.class);
         final var transpiler = this.getGStringTranspiler();
         final GStringExpression gStringExpression = transpiler.createGStringExpression(gStringBodyTextNode);
-        assertEquals("Hello, $target!", gStringExpression.getText());
+        assertEquals(source, gStringExpression.getText());
+        further.accept(gStringExpression);
+    }
+
+    @Test
+    public void gStringExpressionWithDollarReference() {
+        this.doTest("Hello, $target!", gStringExpression -> {
+            assertEquals(2, gStringExpression.getStrings().size());
+            assertEquals(1, gStringExpression.getValues().size());
+        });
+    }
+
+    @Test
+    public void multiplePathValues() {
+        this.doTest("$greeting, $target!", gStringExpression -> {
+            assertEquals(3, gStringExpression.getStrings().size());
+            assertEquals(2, gStringExpression.getValues().size());
+            final var firstValue = gStringExpression.getValue(0);
+            assertInstanceOf(VariableExpression.class, firstValue);
+            assertEquals("greeting", firstValue.getText());
+            final var secondValue = gStringExpression.getValue(1);
+            assertInstanceOf(VariableExpression.class, secondValue);
+            assertEquals("target", secondValue.getText());
+        });
+    }
+
+    @Test
+    public void pathAndClosure() {
+        this.doTest("$greeting, ${consume(out)}!", gStringExpression -> {
+            assertEquals(3, gStringExpression.getStrings().size());
+            assertEquals(2, gStringExpression.getValues().size());
+            final var firstValue = gStringExpression.getValue(0);
+            assertInstanceOf(VariableExpression.class, firstValue);
+            assertEquals("greeting", firstValue.getText());
+            assertInstanceOf(ClosureExpression.class, gStringExpression.getValue(1));
+        });
     }
 
 }

web-views/src/testFixtures/java/groowt/view/web/transpiler/PreambleTranspilerTests.java

@@ -1,17 +0,0 @@
-package groowt.view.web.transpiler;
-
-import groowt.view.web.transpile.PreambleTranspiler;
-import org.junit.jupiter.api.Test;
-
-public abstract class PreambleTranspilerTests {
-
-    protected final PreambleTranspiler preambleTranspiler;
-
-    public PreambleTranspilerTests(PreambleTranspiler preambleTranspiler) {
-        this.preambleTranspiler = preambleTranspiler;
-    }
-
-    @Test
-    public void smokeScreen() {}
-
-}

web-views/src/tools/binTemplate.gst

@@ -1,3 +1,3 @@
 #/usr/bin/env bash
 
-java -cp build/libs/web-tools.jar:build/libs/web.jar $mainClassName "\$@"
+../gradlew toolsJar && java -cp build/libs/web-tools.jar:build/libs/web.jar $mainClassName "\$@"

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

@@ -36,6 +36,9 @@ class ConvertToGroovy implements Callable<Integer> {
     @CommandLine.Option(names = ['-o', '--out'], description = 'Write source files to disk instead of printing them.')
     boolean writeOut
 
+    @CommandLine.Option(names = ['-q', '--quiet'], description = 'Do not print the class source to the console.')
+    boolean quiet
+
     // Default is Phases.CLASS_GENERATION (7)
     @CommandLine.Option(
             names = ['-t', '--compilePhase'],
@@ -44,6 +47,12 @@ class ConvertToGroovy implements Callable<Integer> {
     )
     int compilePhase
 
+    @CommandLine.Option(
+            names = ['-c', '--classes'],
+            description = 'Whether to output the class files, if the compile phase is late enough. If this is false, any generated classes will be thrown out.'
+    )
+    boolean doClasses
+
     @CommandLine.Option(
             names = ['-d', '--classesDir'],
             description = 'If the GroovyCompiler outputs classes, where to write them.'
@@ -60,7 +69,9 @@ class ConvertToGroovy implements Callable<Integer> {
                 def astBuilder = new DefaultAstBuilder(new DefaultNodeFactory(tokenList))
                 def cuNode = astBuilder.build(parseResult.compilationUnitContext) as CompilationUnitNode
                 def config = new CompilerConfiguration().tap {
-                    it.targetDirectory = this.classesDir ?: new File(target.parentFile, 'classes')
+                    it.targetDirectory = this.doClasses
+                            ? this.classesDir ?: new File(target.parentFile, 'classes')
+                            : File.createTempDir()
                 }
                 def gcu = new CompilationUnit(config)
 
@@ -84,7 +95,8 @@ class ConvertToGroovy implements Callable<Integer> {
                 if (this.writeOut) {
                     def outFile = new File(target.parentFile, name + '.groovy')
                     outFile.write(w.toString())
-                } else {
+                }
+                if (!this.quiet) {
                     println w.toString()
                 }
                 return true

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

@@ -0,0 +1,48 @@
+package groowt.view.web.tools
+
+import groowt.view.component.DefaultComponentContext
+import groowt.view.web.DefaultWebComponentTemplateCompiler
+import groowt.view.web.DefaultWebViewComponent
+import groowt.view.web.WebViewTemplateComponentSource
+import groowt.view.web.runtime.WebViewComponentWriter
+import org.codehaus.groovy.control.CompilerConfiguration
+import picocli.CommandLine
+import picocli.CommandLine.Command
+import picocli.CommandLine.Option
+import picocli.CommandLine.Parameters
+
+import java.util.concurrent.Callable
+
+@Command(
+        name = 'runTemplate',
+        description = 'render a wvc template with the given params'
+)
+class RunTemplate implements Callable<Integer> {
+
+    @Parameters(arity = '1', description = 'The template file.')
+    File template
+
+    @Option(
+            names = ['-A', '--attr', '--attribute'],
+            description = 'Attribute(s) to pass to the template.'
+    )
+    Map<String, String> properties
+
+    @Override
+    Integer call() throws Exception {
+        def component = new DefaultWebViewComponent(WebViewTemplateComponentSource.of(this.template))
+
+        def context = new DefaultComponentContext()
+        context.pushDefaultScope()
+        component.context = context
+
+        println component.render()
+
+        return 0
+    }
+
+    static void main(String[] args) {
+        System.exit(new CommandLine(new RunTemplate()).execute(args))
+    }
+
+}