unilang_parser 0.34.0

//! Help Operator Usage Example
//!
//! This example demonstrates :
//! - Basic help requests with ?
//! - Contextual help with arguments
//! - Help operator positioning rules

use unilang_parser :: { Parser, UnilangParserOptions };

fn main() -> Result< (), Box< dyn core ::error ::Error > >
{
  let parser = Parser ::new( UnilangParserOptions ::default() );

  // Basic command help
  println!( "=== Basic Command Help ===" );
  let cmd = parser.parse_repl_input( "file.copy ?" )?;
  println!( "Command: {:?}", cmd.command_path_slices );
  println!( "Help requested: {:?}", cmd.help_requested );
  println!( "Arguments: {:?}", cmd.positional_arguments );

  assert!( cmd.help_requested );
  assert_eq!( cmd.command_path_slices, [ "file", "copy" ] );

  // Contextual help with arguments
  println!( "\n=== Contextual Help with Arguments ===" );
  let cmd2 = parser.parse_repl_input( "database.migrate version :: 1.2.0 ?" )?;
  println!( "Command: {:?}", cmd2.command_path_slices );
  println!( "Help requested: {:?}", cmd2.help_requested );
  println!( "Context arguments: {:?}", cmd2.named_arguments );

  assert!( cmd2.help_requested );
  assert_eq!
  (
  cmd2.named_arguments
  .get( "version" )
  .map( | arg | &arg[0].value )
  .unwrap(),
  "1.2.0"
 );

  // Namespace help
  println!( "\n=== Namespace Help ===" );
  let cmd3 = parser.parse_repl_input( "system ?" )?;
  println!( "Namespace: {:?}", cmd3.command_path_slices );
  println!( "Help requested: {:?}", cmd3.help_requested );

  // Help with multiple arguments for context
  println!( "\n=== Help with Multiple Context Arguments ===" );
  let cmd4 = parser.parse_repl_input
  (
  "server.deploy target ::production config :: \"/etc/app.yaml\" replicas :: 5 ?"
 )?;
  println!( "Command: {:?}", cmd4.command_path_slices );
  println!( "Help with context: {:?}", cmd4.named_arguments );
  println!( "Help requested: {:?}", cmd4.help_requested );

  assert!( cmd4.help_requested );
  assert_eq!( cmd4.named_arguments.len(), 3 );

  println!( "\n✓ Help operator usage parsing successful!" );
  Ok( () )
}