// Copyright 2012-2013 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

use syntax::ext::base::{SyntaxExtension, NamedSyntaxExtension, NormalTT};
use syntax::ext::base::{IdentTT, ItemDecorator, ItemModifier, BasicMacroExpander};
use syntax::ext::base::{MacroExpanderFn};
use syntax::codemap::Span;
use syntax::parse::token;
use syntax::ast;

pub struct Registry {
    #[doc(hidden)]
    pub krate_span: Span,

    #[doc(hidden)]
    pub syntax_exts: Vec<NamedSyntaxExtension>,
}

pub type PluginRegistrarFun =
    fn(&mut Registry);

impl Registry {
    #[doc(hidden)]
    pub fn new(krate: &ast::Crate) -> Registry {
        Registry {
            krate_span: krate.span,
            syntax_exts: vec!(),
        }
    }

    pub fn register_syntax_extension(&mut self, name: ast::Name, extension: SyntaxExtension) {
        self.syntax_exts.push((name, match extension {
            NormalTT(ext, _) => NormalTT(ext, Some(self.krate_span)),
            IdentTT(ext, _) => IdentTT(ext, Some(self.krate_span)),
            ItemDecorator(ext) => ItemDecorator(ext),
            ItemModifier(ext) => ItemModifier(ext),
        }));
    }

    pub fn register_macro(&mut self, name: &str, expander: MacroExpanderFn) {
        self.register_syntax_extension(
            token::intern(name),
            NormalTT(box BasicMacroExpander {
                expander: expander,
                span: None,
            }, None));
    }
}