gp4/Sources/Cli/main.swift

// p4rse, Copyright 2026, Will Hawkins
//
// This file is part of p4rse.
//
// This file is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.

import ArgumentParser
import Common
import P4Compiler
import P4Runtime
import SystemPackage

@main
struct Cli: ParsableCommand {
  @Flag(help: "Disable ANSI-stylized output.") var plain: Int

  static let configuration = CommandConfiguration(
    abstract: "P4CE compiler, interpreter and debugger.",
    subcommands: [Compile.self, CodeGen.self])
}

struct CliOptions: ParsableArguments {
  @ArgumentParser.Argument(help: "File to compile.")  // Have to be explicit because Common has an Argument, too!
  var path: String

  @Option(name: [.customShort("I")], help: "Search paths.")
  var search: [String] = []
}

extension Cli {
  struct Compile: ParsableCommand {
    static let configuration = CommandConfiguration(abstract: "Compile P4CE code.")

    @ParentCommand var parent: Cli

    @OptionGroup var options: CliOptions

    mutating func run() {
      let sm = SourceManager(options.search.map { FilePath($0) })
      let prep = SourceCodePreprocessor(sm)
      let file = FilePath(options.path)

      let formatter: any Formattable =
        if parent.plain != 0 {
          FormatterPlain()
        } else {
          FormatterAnsi()
        }

      let maybe_source = prep.preprocess(file)
      guard case .Ok(let source) = maybe_source else {
        print(ErrorWithLabel("Preprocessor Error", maybe_source.error()!).format(formatter))
        return
      }

      let maybe_program = Program.Compile(source.getSource())
      guard case .Ok(_) = maybe_program else {
        print(ErrorWithLabel("Compiler Error", maybe_source.error()!).format(formatter))
        return
      }

      print(
        formatter.formatWithStyle(
          "Success", Style(StyleColor.Green, [StyleFormat.Underline])))
    }
  }
}

extension Cli {
  struct CodeGen: ParsableCommand {
    static let configuration = CommandConfiguration(abstract: "Generate P4CE code.")

    @ParentCommand var parent: Cli

    @OptionGroup var options: CliOptions

    mutating func run() {
      let sm = SourceManager(options.search.map { FilePath($0) })
      let prep = SourceCodePreprocessor(sm)
      let file = FilePath(options.path)

      let formatter: any Formattable =
        if parent.plain != 0 {
          FormatterPlain()
        } else {
          FormatterAnsi()
        }

      let maybe_source = prep.preprocess(file)
      guard case .Ok(let source) = maybe_source else {
        print(ErrorWithLabel("Preprocessor Error", maybe_source.error()!).format(formatter))
        return
      }

      let maybe_program = Program.Compile(source.getSource())
      guard case .Ok(let program) = maybe_program else {
        print(ErrorWithLabel("Compiler Error", maybe_source.error()!).format(formatter))
        return
      }

      let maybe_codegen = P4Runtime.CodeGenerator().codeGen(program)
      guard case .Ok(let codegen) = maybe_codegen else {
        let formatter = FormatterAnsi()
        print(ErrorWithLabel("Code Generation Error", maybe_codegen.error()!).format(formatter))
        return
      }

      print("\(codegen.getGeneratedCode())")
    }
  }
}