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use ast::{AndOr, RedirectOrCmdWord, RedirectOrEnvVar};
use ast::builder::*;
use void::Void;

/// A no-op `Builder` which ignores all inputs and always returns `()`.
///
/// Useful for validation of correct programs (i.e. parsing input without
/// caring about the actual AST representations).
#[derive(Debug, Copy, Clone)]
pub struct EmptyBuilder;

impl Default for EmptyBuilder {
    fn default() -> Self {
        EmptyBuilder::new()
    }
}

impl EmptyBuilder {
    /// Constructs a builder.
    pub fn new() -> Self {
        EmptyBuilder
    }
}

impl Builder for EmptyBuilder {
    type Command         = ();
    type CommandList     = ();
    type ListableCommand = ();
    type PipeableCommand = ();
    type CompoundCommand = ();
    type Word            = ();
    type Redirect        = ();
    type Error           = Void;

    fn complete_command(&mut self,
                        _pre_cmd_comments: Vec<Newline>,
                        _cmd: Self::Command,
                        _separator: SeparatorKind,
                        _cmd_comment: Option<Newline>)
        -> Result<Self::Command, Self::Error>
    {
        Ok(())
    }

    fn and_or_list(&mut self,
              _first: Self::ListableCommand,
              _rest: Vec<(Vec<Newline>, AndOr<Self::ListableCommand>)>)
        -> Result<Self::CommandList, Self::Error>
    {
        Ok(())
    }

    fn pipeline(&mut self,
                _bang: bool,
                _cmds: Vec<(Vec<Newline>, Self::Command)>)
        -> Result<Self::Command, Self::Error>
    {
        Ok(())
    }

    fn simple_command(
        &mut self,
        _redirects_or_env_vars: Vec<RedirectOrEnvVar<Self::Redirect, String, Self::Word>>,
        _redirects_or_cmd_words: Vec<RedirectOrCmdWord<Self::Redirect, Self::Word>>
    ) -> Result<Self::PipeableCommand, Self::Error>
    {
        Ok(())
    }

    fn brace_group(&mut self,
                   _cmds: CommandGroup<Self::Command>,
                   _redirects: Vec<Self::Redirect>)
        -> Result<Self::Command, Self::Error>
    {
        Ok(())
    }

    fn subshell(&mut self,
                _cmds: CommandGroup<Self::Command>,
                _redirects: Vec<Self::Redirect>)
        -> Result<Self::Command, Self::Error>
    {
        Ok(())
    }

    fn loop_command(&mut self,
                    __kind: LoopKind,
                    __guard_body_pair: GuardBodyPairGroup<Self::Command>,
                    __redirects: Vec<Self::Redirect>)
        -> Result<Self::CompoundCommand, Self::Error>
    {
        Ok(())
    }

    fn if_command(&mut self,
                  _fragments: IfFragments<Self::Command>,
                  _redirects: Vec<Self::Redirect>)
        -> Result<Self::Command, Self::Error>
    {
        Ok(())
    }

    fn for_command(&mut self,
                   _fragments: ForFragments<Self::Word, Self::Command>,
                   _redirects: Vec<Self::Redirect>)
        -> Result<Self::Command, Self::Error>
    {
        Ok(())
    }

    fn case_command(&mut self,
                    _fragments: CaseFragments<Self::Word, Self::Command>,
                    _redirects: Vec<Self::Redirect>)
        -> Result<Self::Command, Self::Error>
    {
        Ok(())
    }

    fn function_declaration(&mut self,
                            _name: String,
                            _post_name_comments: Vec<Newline>,
                            _body: Self::CompoundCommand)
        -> Result<Self::Command, Self::Error>
    {
        Ok(())
    }

    fn comments(&mut self,
                _comments: Vec<Newline>)
        -> Result<(), Self::Error>
    {
        Ok(())
    }

    fn word(&mut self,
            _kind: ComplexWordKind<Self::Command>)
        -> Result<Self::Word, Self::Error>
    {
        Ok(())
    }

    fn redirect(&mut self,
                _kind: RedirectKind<Self::Word>)
        -> Result<Self::Redirect, Self::Error>
    {
        Ok(())
    }

    fn compound_command_into_pipeable(&mut self,
                                      _cmd: Self::CompoundCommand)
        -> Result<Self::PipeableCommand, Self::Error>
    {
        Ok(())
    }
}