An actual command line tool to run pork programs.

README.md

@@ -5,28 +5,21 @@ A small BBQ language.
 Very WIP. Like VERY.
 
 ```pork
-main = {
-  three = 3
-  two = 2
-  calculateSimple = {
-    (50 + three) * two
-  }
-  calculateComplex = {
-    three + two + 50
-  }
-  calculateSimpleResult = calculateSimple()
-  calculateComplexResult = calculateComplex()
-
-  list = [10, 20, 30]
-  trueValue = true
-  falseValue = false
-
-  [
-    calculateSimpleResult,
-    calculateComplexResult,
-    list,
-    trueValue,
-    falseValue
-  ]
+/* fibonacci sequence */
+fib = { n in
+  if n == 0
+    then 0
+  else if n == 1
+    then 1
+  else fib(n - 1) + fib(n - 2)
 }
+
+result = fib(20)
+println(result)
+```
+
+## Usage
+
+```
+./gradlew -q run --args 'run examples/fib.pork'
 ```

build.gradle.kts

@@ -23,6 +23,7 @@ java {
 dependencies {
   implementation("org.jetbrains.kotlin:kotlin-bom")
   implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8")
+  implementation("com.github.ajalt.clikt:clikt:4.2.0")
 }
 
 tasks.withType<KotlinCompile> {
@@ -34,15 +35,17 @@ tasks.withType<Wrapper> {
 }
 
 application {
-  mainClass.set("gay.pizza.pork.MainKt")
+  mainClass.set("gay.pizza.pork.cli.MainKt")
 }
 
 graalvmNative {
   binaries {
     named("main") {
       imageName.set("pork")
-      mainClass.set("gay.pizza.pork.MainKt")
+      mainClass.set("gay.pizza.pork.cli.MainKt")
       sharedLibrary.set(false)
     }
   }
 }
+
+tasks.run.get().outputs.upToDateWhen { false }

examples/fib.pork

@@ -7,4 +7,5 @@ fib = { n in
   else fib(n - 1) + fib(n - 2)
 }
 
-main = { in fib(20) }
+result = fib(20)
+println(result)

examples/if.pork

@@ -1,7 +0,0 @@
-check = { value in
-  if value then 50
-}
-
-main = { in
-  value = check(100)
-}

examples/syntax.pork

@@ -1,53 +1,52 @@
-/* main function */
-main = { in
-  three = 3
-  two = 2
+three = 3
+two = 2
 
-  calculateSimple = { in
-    (50 + three) * two
-  }
-
-  calculateComplex = { in
-    three + two + 50
-  }
-
-  multiply = { a, b in
-    a * b
-  }
-
-  // calculates the result
-  calculateSimpleResult = calculateSimple()
-  calculateComplexResult = calculateComplex()
-  multiplyResult = multiply(50, 50)
-
-  list = [10, 20, 30]
-  trueValue = true
-  falseValue = false
-
-  invert = { value in
-    !value
-  }
-
-  notEqual = { a, b in
-    a != b
-  }
-
-  equal = { a, b in
-    a == b
-  }
-
-  [
-    calculateSimpleResult,
-    calculateComplexResult,
-    multiplyResult,
-    list,
-    trueValue,
-    falseValue,
-    invert(true),
-    invert(false),
-    equal(5, 5),
-    equal(5, 6),
-    notEqual(5, 5),
-    notEqual(5, 6)
-  ]
+calculateSimple = { in
+  (50 + three) * two
 }
+
+calculateComplex = { in
+  three + two + 50
+}
+
+multiply = { a, b in
+  a * b
+}
+
+// calculates the result
+calculateSimpleResult = calculateSimple()
+calculateComplexResult = calculateComplex()
+multiplyResult = multiply(50, 50)
+
+list = [10, 20, 30]
+trueValue = true
+falseValue = false
+
+invert = { value in
+  !value
+}
+
+notEqual = { a, b in
+  a != b
+}
+
+equal = { a, b in
+  a == b
+}
+
+results = [
+  calculateSimpleResult,
+  calculateComplexResult,
+  multiplyResult,
+  list,
+  trueValue,
+  falseValue,
+  invert(true),
+  invert(false),
+  equal(5, 5),
+  equal(5, 6),
+  notEqual(5, 5),
+  notEqual(5, 6)
+]
+
+println(results)

src/main/kotlin/gay/pizza/pork/cli/GenerateKotlinCommand.kt

@@ -0,0 +1,23 @@
+package gay.pizza.pork.cli
+
+import com.github.ajalt.clikt.core.CliktCommand
+import com.github.ajalt.clikt.parameters.arguments.argument
+import com.github.ajalt.clikt.parameters.types.path
+import gay.pizza.pork.compiler.KotlinCompiler
+import gay.pizza.pork.parse.PorkParser
+import gay.pizza.pork.parse.PorkTokenizer
+import gay.pizza.pork.parse.StringCharSource
+import gay.pizza.pork.parse.TokenStreamSource
+import kotlin.io.path.readText
+
+class GenerateKotlinCommand : CliktCommand(help = "Generate Kotlin Code", name = "generate-kotlin") {
+  val path by argument("file").path(mustExist = true, canBeDir = false)
+
+  override fun run() {
+    val content = path.readText()
+    val tokenStream = PorkTokenizer(StringCharSource(content)).tokenize()
+    val program = PorkParser(TokenStreamSource(tokenStream)).readProgram()
+    val compiler = KotlinCompiler()
+    println(compiler.visit(program))
+  }
+}

src/main/kotlin/gay/pizza/pork/cli/HighlightCommand.kt

@@ -0,0 +1,21 @@
+package gay.pizza.pork.cli
+
+import com.github.ajalt.clikt.core.CliktCommand
+import com.github.ajalt.clikt.parameters.arguments.argument
+import com.github.ajalt.clikt.parameters.types.path
+import gay.pizza.pork.parse.AnsiHighlightScheme
+import gay.pizza.pork.parse.Highlighter
+import gay.pizza.pork.parse.PorkTokenizer
+import gay.pizza.pork.parse.StringCharSource
+import kotlin.io.path.readText
+
+class HighlightCommand : CliktCommand(help = "Syntax Highlighter", name = "highlight") {
+  val path by argument("file").path(mustExist = true, canBeDir = false)
+
+  override fun run() {
+    val content = path.readText()
+    val tokenStream = PorkTokenizer(StringCharSource(content)).tokenize()
+    val highlighter = Highlighter(AnsiHighlightScheme())
+    print(highlighter.highlight(tokenStream).joinToString(""))
+  }
+}

src/main/kotlin/gay/pizza/pork/cli/RootCommand.kt

@@ -0,0 +1,20 @@
+package gay.pizza.pork.cli
+
+import com.github.ajalt.clikt.core.CliktCommand
+import com.github.ajalt.clikt.core.subcommands
+
+class RootCommand : CliktCommand(
+  help = "Pork - The BBQ Language",
+  name = "pork"
+) {
+  init {
+    subcommands(
+      RunCommand(),
+      HighlightCommand(),
+      TokenizeCommand(),
+      GenerateKotlinCommand()
+    )
+  }
+
+  override fun run() {}
+}

src/main/kotlin/gay/pizza/pork/cli/RunCommand.kt

@@ -0,0 +1,32 @@
+package gay.pizza.pork.cli
+
+import com.github.ajalt.clikt.core.CliktCommand
+import com.github.ajalt.clikt.parameters.arguments.argument
+import com.github.ajalt.clikt.parameters.types.path
+import gay.pizza.pork.eval.CallableFunction
+import gay.pizza.pork.eval.PorkEvaluator
+import gay.pizza.pork.eval.Scope
+import gay.pizza.pork.parse.PorkParser
+import gay.pizza.pork.parse.PorkTokenizer
+import gay.pizza.pork.parse.StringCharSource
+import gay.pizza.pork.parse.TokenStreamSource
+import kotlin.io.path.readText
+
+class RunCommand : CliktCommand(help = "Run Program", name = "run") {
+  val path by argument("file").path(mustExist = true, canBeDir = false)
+
+  override fun run() {
+    val content = path.readText()
+    val tokenStream = PorkTokenizer(StringCharSource(content)).tokenize()
+    val program = PorkParser(TokenStreamSource(tokenStream)).readProgram()
+
+    val scope = Scope()
+    scope.define("println", CallableFunction { arguments ->
+      for (argument in arguments.values) {
+        println(argument)
+      }
+    })
+    val evaluator = PorkEvaluator(scope)
+    evaluator.visit(program)
+  }
+}

src/main/kotlin/gay/pizza/pork/cli/TokenizeCommand.kt

@@ -0,0 +1,25 @@
+package gay.pizza.pork.cli
+
+import com.github.ajalt.clikt.core.CliktCommand
+import com.github.ajalt.clikt.parameters.arguments.argument
+import com.github.ajalt.clikt.parameters.types.path
+import gay.pizza.pork.parse.PorkTokenizer
+import gay.pizza.pork.parse.StringCharSource
+import kotlin.io.path.readText
+
+class TokenizeCommand : CliktCommand(help = "Tokenize Program", name = "tokenize") {
+  val path by argument("file").path(mustExist = true, canBeDir = false)
+
+  override fun run() {
+    val content = path.readText()
+    val tokenStream = PorkTokenizer(StringCharSource(content)).tokenize()
+    for (token in tokenStream.tokens) {
+      println("${token.start} ${token.type.name} '${sanitize(token.text)}'")
+    }
+  }
+
+  private fun sanitize(input: String): String =
+    input
+      .replace("\n", "\\n")
+      .replace("\r", "\\r")
+}

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

@@ -0,0 +1,3 @@
+package gay.pizza.pork.cli
+
+fun main(args: Array<String>) = RootCommand().main(args)

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

@@ -1,65 +0,0 @@
-package gay.pizza.pork
-
-import gay.pizza.pork.ast.Printer
-import gay.pizza.pork.ast.nodes.Program
-import gay.pizza.pork.eval.Arguments
-import gay.pizza.pork.eval.PorkEvaluator
-import gay.pizza.pork.eval.Scope
-import gay.pizza.pork.parse.*
-import kotlin.io.path.Path
-import kotlin.io.path.readText
-
-fun eval(ast: Program) {
-  val scope = Scope()
-  val evaluator = PorkEvaluator(scope)
-  evaluator.visit(ast)
-  println("> ${scope.call("main", Arguments.Zero)}")
-}
-
-fun validateTokenSoundness(input: String, stream: TokenStream) {
-  var expectedIndex = 0
-  for (token in stream.tokens) {
-    if (token.start != expectedIndex) {
-      throw RuntimeException("Expected token to be at index $expectedIndex but was ${token.start}")
-    }
-    val slice = input.slice(token.start until token.start + token.text.length)
-    if (slice != token.text) {
-      throw RuntimeException(
-        "Expected index ${token.start} for length ${token.text.length} to" +
-        " equal '${token.text}' but was '$slice'")
-    }
-    expectedIndex += token.text.length
-  }
-}
-
-fun main(args: Array<String>) {
-  val code = Path(args[0]).readText()
-  val stream = tokenize(code)
-  println(stream.tokens.joinToString("\n"))
-  val program = parse(stream)
-  eval(program)
-
-  val exactCode = stream.tokens.joinToString("") { it.text }
-  validateTokenSoundness(code, stream)
-  if (exactCode != code) {
-    throw RuntimeException("Token reconstruction didn't succeed.")
-  }
-
-  val generated = buildString { Printer(this).visit(program) }
-  val parsedAst = parse(tokenize(generated))
-  parse(tokenize(generated))
-  println(generated)
-
-  if (program != parsedAst) {
-    throw RuntimeException("Equality of parsed AST from printer was not proven.")
-  }
-
-  val highlighter = Highlighter(AnsiHighlightScheme())
-  println(highlighter.highlight(stream).joinToString(""))
-}
-
-fun tokenize(input: String): TokenStream =
-  PorkTokenizer(StringCharSource(input)).tokenize()
-
-fun parse(stream: TokenStream): Program =
-  PorkParser(TokenStreamSource(stream)).readProgram()

src/main/kotlin/gay/pizza/pork/parse/PorkParser.kt

@@ -108,7 +108,9 @@ class PorkParser(source: PeekableSource<Token>) {
       }
 
       else -> {
-        throw RuntimeException("Failed to parse token: ${token.type} '${token.text}' as expression")
+        throw RuntimeException(
+          "Failed to parse token: ${token.type} '${token.text}' as expression" +
+          " (index ${unsanitizedSource.currentIndex})")
       }
     }