Create generators from config

8 files changed, 118 insertions, 12 deletions

diff --git a/examples/01-struct/hobgoblin.json5 b/examples/01-struct/hobgoblin.json5
index 0967ef4..b6bb102 100644
--- a/examples/01-struct/hobgoblin.json5
+++ b/examples/01-struct/hobgoblin.json5
@@ -1 +1,9 @@
-{}
+{
+  "outputs": [
+    {
+      "generator": "java-types",
+      "path": "output/java/src/gen/java",
+      "package-name": "org.zwobble.example.types"
+    },
+  ],
+}
diff --git a/examples/02-sum/hobgoblin.json5 b/examples/02-sum/hobgoblin.json5
index 0967ef4..b6bb102 100644
--- a/examples/02-sum/hobgoblin.json5
+++ b/examples/02-sum/hobgoblin.json5
@@ -1 +1,9 @@
-{}
+{
+  "outputs": [
+    {
+      "generator": "java-types",
+      "path": "output/java/src/gen/java",
+      "package-name": "org.zwobble.example.types"
+    },
+  ],
+}
diff --git a/pom.xml b/pom.xml
index 7c2a6bf..fc4c716 100644
--- a/pom.xml
+++ b/pom.xml
@@ -62,6 +62,11 @@
       <version>0.1.0</version>
     </dependency>
     <dependency>
+      <groupId>org.zwobble.json5</groupId>
+      <artifactId>zwobble-json5</artifactId>
+      <version>0.1.0</version>
+    </dependency>
+    <dependency>
       <groupId>org.junit.jupiter</groupId>
       <artifactId>junit-jupiter</artifactId>
       <scope>test</scope>
diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/HobgoblinCompiler.java b/src/main/java/org/zwobble/hobgoblin/compiler/HobgoblinCompiler.java
index 698d68f..873ecfd 100644
--- a/src/main/java/org/zwobble/hobgoblin/compiler/HobgoblinCompiler.java
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/HobgoblinCompiler.java
@@ -2,7 +2,7 @@ package org.zwobble.hobgoblin.compiler;
 
 import org.zwobble.hobgoblin.compiler.ast.typed.TypedNamespaceNode;
 import org.zwobble.hobgoblin.compiler.builtins.BuiltinTypes;
-import org.zwobble.hobgoblin.compiler.output.generators.Generator;
+import org.zwobble.hobgoblin.compiler.config.ProjectConfig;
 import org.zwobble.hobgoblin.compiler.parser.Parser;
 import org.zwobble.hobgoblin.compiler.typechecker.TypeChecker;
 import org.zwobble.hobgoblin.compiler.typechecker.TypeCheckerGlobalContext;
@@ -14,7 +14,6 @@ import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.util.ArrayList;
-import java.util.List;
 
 public class HobgoblinCompiler {
     public static final String FILE_NAME_EXTENSION = ".hob";
@@ -22,7 +21,10 @@ public class HobgoblinCompiler {
     private HobgoblinCompiler() {
     }
 
-    public static void compile(Path projectRoot, List<? extends Generator> generators) throws IOException {
+    public static void compile(Path projectRoot) throws IOException {
+        var config = ProjectConfig.read(projectRoot);
+        var generators = config.createGenerators();
+
         var sourceDirectory = projectRoot.resolve("src");
         var sourceFiles = sourceDirectory.toFile()
             .listFiles(file -> file.toPath().toString().endsWith(FILE_NAME_EXTENSION));
diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/config/OutputConfig.java b/src/main/java/org/zwobble/hobgoblin/compiler/config/OutputConfig.java
new file mode 100644
index 0000000..ae31bdd
--- /dev/null
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/config/OutputConfig.java
@@ -0,0 +1,7 @@
+package org.zwobble.hobgoblin.compiler.config;
+
+import org.zwobble.hobgoblin.compiler.output.generators.Generator;
+
+public interface OutputConfig {
+     Generator createGenerator();
+}
diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/config/ProjectConfig.java b/src/main/java/org/zwobble/hobgoblin/compiler/config/ProjectConfig.java
new file mode 100644
index 0000000..ee70dba
--- /dev/null
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/config/ProjectConfig.java
@@ -0,0 +1,68 @@
+package org.zwobble.hobgoblin.compiler.config;
+
+import org.zwobble.hobgoblin.compiler.output.generators.Generator;
+import org.zwobble.hobgoblin.compiler.output.generators.javatypes.JavaTypesGenerator;
+import org.zwobble.json5.parser.Json5Parser;
+import org.zwobble.json5.values.Json5Array;
+import org.zwobble.json5.values.Json5Object;
+import org.zwobble.json5.values.Json5String;
+import org.zwobble.json5.values.Json5Value;
+import org.zwobble.sourcetext.SourceText;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.List;
+
+public record ProjectConfig(
+    List<OutputConfig> output
+) {
+    public static ProjectConfig read(Path projectRoot) throws IOException {
+        var configPath = projectRoot.resolve("hobgoblin.json5");
+        var contents = Files.readString(configPath);
+        var sourceText = SourceText.fromString(configPath.toString(), contents);
+        return fromSourceText(projectRoot, sourceText);
+    }
+
+    private static ProjectConfig fromSourceText(Path projectRoot, SourceText sourceText) {
+        return fromJson5(projectRoot, Json5Parser.parse(sourceText));
+    }
+
+    private static ProjectConfig fromJson5(Path projectRoot, Json5Value document) {
+        if (!(document instanceof Json5Object documentObject)) {
+            throw new UnsupportedOperationException("TODO");
+        }
+
+        var outputsValue = documentObject.getValue("outputs").orElseThrow();
+        if (!(outputsValue instanceof Json5Array outputsArray)) {
+            throw new UnsupportedOperationException("TODO");
+        }
+
+        var outputs = new ArrayList<OutputConfig>();
+        for (var outputValue : outputsArray.elements()) {
+            if (!(outputValue instanceof Json5Object outputObject)) {
+                throw new UnsupportedOperationException("TODO");
+            }
+            var generatorName = (Json5String) outputObject.getValue("generator").orElseThrow();
+
+            var output = switch (generatorName.value()) {
+                case JavaTypesGenerator.NAME ->
+                    JavaTypesGenerator.parseOutputConfig(projectRoot, outputObject);
+
+                default ->
+                    throw new UnsupportedOperationException("TODO");
+            };
+
+            outputs.add(output);
+        }
+
+        return new ProjectConfig(outputs);
+    }
+
+    public List<Generator> createGenerators() {
+        return this.output.stream()
+            .map(output -> output.createGenerator())
+            .toList();
+    }
+}
diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/javatypes/JavaTypesGenerator.java b/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/javatypes/JavaTypesGenerator.java
index 98d4c12..4c06e8e 100644
--- a/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/javatypes/JavaTypesGenerator.java
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/javatypes/JavaTypesGenerator.java
@@ -5,11 +5,14 @@ import org.zwobble.hobgoblin.compiler.ast.typed.TypedStructDefinitionNode;
 import org.zwobble.hobgoblin.compiler.ast.typed.TypedSumDefinitionNode;
 import org.zwobble.hobgoblin.compiler.ast.typed.TypedTypeLevelExpressionNode;
 import org.zwobble.hobgoblin.compiler.builtins.BuiltinTypes;
+import org.zwobble.hobgoblin.compiler.config.OutputConfig;
 import org.zwobble.hobgoblin.compiler.output.CodeWriter;
 import org.zwobble.hobgoblin.compiler.output.generators.Generator;
 import org.zwobble.hobgoblin.compiler.output.java.JavaWriter;
 import org.zwobble.hobgoblin.compiler.output.java.ast.*;
 import org.zwobble.hobgoblin.compiler.types.*;
+import org.zwobble.json5.values.Json5Object;
+import org.zwobble.json5.values.Json5String;
 
 import java.io.File;
 import java.io.IOException;
@@ -19,6 +22,17 @@ import java.util.HashMap;
 import java.util.List;
 
 public class JavaTypesGenerator implements Generator {
+    public static final String NAME = "java-types";
+
+    public static OutputConfig parseOutputConfig(Path projectRoot, Json5Object output) {
+        return () -> {
+            var relativeOutputPath = ((Json5String) output.getValue("path").orElseThrow()).value();
+            var outputPath = projectRoot.resolve(relativeOutputPath);
+            var packageName = ((Json5String) output.getValue("package-name").orElseThrow()).value();
+            return new JavaTypesGenerator(outputPath, packageName);
+        };
+    }
+
     private final Path sourceRootDirectory;
     private final List<String> packageName;
 
diff --git a/src/test/java/org/zwobble/hobgoblin/compiler/ExampleTests.java b/src/test/java/org/zwobble/hobgoblin/compiler/ExampleTests.java
index fb5cc55..fd38a84 100644
--- a/src/test/java/org/zwobble/hobgoblin/compiler/ExampleTests.java
+++ b/src/test/java/org/zwobble/hobgoblin/compiler/ExampleTests.java
@@ -2,7 +2,6 @@ package org.zwobble.hobgoblin.compiler;
 
 import org.junit.jupiter.api.DynamicTest;
 import org.junit.jupiter.api.TestFactory;
-import org.zwobble.hobgoblin.compiler.output.generators.javatypes.JavaTypesGenerator;
 import org.zwobble.hobgoblin.compiler.testing.TestProcessRunner;
 
 import java.io.IOException;
@@ -22,12 +21,7 @@ public class ExampleTests {
     private void runTest(ExampleSet exampleSet) throws IOException, InterruptedException {
         var javaProjectPath = exampleSet.path().resolve("output/java");
 
-        var javaTypesGenerator = new JavaTypesGenerator(
-            javaProjectPath.resolve("src/gen/java"),
-            "org.zwobble.example.types"
-        );
-        var generators = List.of(javaTypesGenerator);
-        HobgoblinCompiler.compile(exampleSet.path(), generators);
+        HobgoblinCompiler.compile(exampleSet.path());
 
         TestProcessRunner.command(List.of("mvn", "compile"))
             .cwd(javaProjectPath)