minimal: pork-rt minimal runtime

minimal/src/main/kotlin/gay/pizza/pork/minimal/FileTool.kt

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+package gay.pizza.pork.minimal
+
+import gay.pizza.dough.fs.FsPath
+import gay.pizza.dough.fs.readString
+import gay.pizza.pork.frontend.ContentSource
+import gay.pizza.pork.frontend.FsContentSource
+import gay.pizza.pork.parser.CharSource
+import gay.pizza.pork.parser.StringCharSource
+
+class FileTool(val path: FsPath) : Tool() {
+  override fun createCharSource(): CharSource =
+    StringCharSource(path.readString())
+  override fun createContentSource(): ContentSource =
+    FsContentSource(path.parent!!)
+  override fun rootFilePath(): String = path.fullPathString
+}

minimal/src/main/kotlin/gay/pizza/pork/minimal/Tool.kt

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+package gay.pizza.pork.minimal
+
+import gay.pizza.pork.ast.CompilationUnit
+import gay.pizza.pork.ast.NodeVisitor
+import gay.pizza.pork.ast.visit
+import gay.pizza.pork.evaluator.*
+import gay.pizza.pork.ffi.JavaAutogenContentSource
+import gay.pizza.pork.ffi.JavaNativeProvider
+import gay.pizza.pork.ffi.JnaNativeProvider
+import gay.pizza.pork.frontend.ContentSource
+import gay.pizza.pork.frontend.ImportLocator
+import gay.pizza.pork.frontend.DynamicImportSource
+import gay.pizza.pork.frontend.World
+import gay.pizza.pork.parser.*
+import gay.pizza.pork.stdlib.PorkStdlib
+
+abstract class Tool {
+  abstract fun createCharSource(): CharSource
+  abstract fun createContentSource(): ContentSource
+  abstract fun rootFilePath(): String
+
+  fun tokenize(): TokenStream =
+    Tokenizer(createCharSource()).tokenize()
+
+  fun parse(attribution: NodeAttribution = DiscardNodeAttribution): CompilationUnit =
+    Parser(TokenStreamSource(tokenize()), attribution).readCompilationUnit()
+
+  fun highlight(scheme: HighlightScheme): List<Highlight> =
+    Highlighter(scheme).highlight(tokenize())
+
+  fun reprint(): String = buildString { visit(Printer(this)) }
+
+  fun <T> visit(visitor: NodeVisitor<T>): T = visitor.visit(parse())
+
+  fun loadMainFunction(scope: Scope, setupEvaluator: Evaluator.() -> Unit = {}): CallableFunction {
+    val fileContentSource = createContentSource()
+    val dynamicImportSource = DynamicImportSource()
+    dynamicImportSource.addContentSource("std", PorkStdlib)
+    dynamicImportSource.addContentSource("local", fileContentSource)
+    dynamicImportSource.addContentSource("java", JavaAutogenContentSource)
+    val world = World(dynamicImportSource)
+    val evaluator = Evaluator(world, scope)
+    setupEvaluator(evaluator)
+    val resultingScope = evaluator.evaluate(ImportLocator("local", rootFilePath()))
+    return resultingScope.value("main") as CallableFunction
+  }
+
+  fun run(scope: Scope, quiet: Boolean = false) {
+    val main = loadMainFunction(scope, setupEvaluator = {
+      addNativeProvider("internal", InternalNativeProvider(quiet = quiet))
+      addNativeProvider("ffi", JnaNativeProvider())
+      addNativeProvider("java", JavaNativeProvider())
+    })
+    main.call(Arguments(emptyList()))
+  }
+}

minimal/src/main/kotlin/gay/pizza/pork/minimal/main.kt

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+package gay.pizza.pork.minimal
+
+import gay.pizza.dough.fs.PlatformFsProvider
+import gay.pizza.pork.evaluator.Scope
+import kotlin.system.exitProcess
+
+fun main(args: Array<String>) {
+  if (args.size != 1) {
+    System.err.println("Usage: pork-rt <file>")
+    exitProcess(1)
+  }
+  val path = PlatformFsProvider.resolve(args[0])
+  val tool = FileTool(path)
+  val scope = Scope()
+  tool.run(scope)
+}