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//! A Rust representation of Abstract Syntax Trees of Erlang modules.
//!
//! Currently the library provide only a functionality that
//! loading ASTs from beam files which have debug infos.
//!
//! See also: [The Abstract Format](http://erlang.org/doc/apps/erts/absform.html)
//!
//! # Examples
//!
//! ```
//! use erl_ast::AST;
//!
//! let ast = AST::from_beam_file("src/testdata/test.beam").unwrap();
//! println!("{:?}", ast);
//! ```
extern crate beam_file;
extern crate eetf;
extern crate num;

pub mod ast;
pub mod result;
pub mod error;
pub mod format;

use std::path::Path;

/// Abstract Syntax Tree
#[derive(Debug)]
pub struct AST {
    pub module: ast::ModuleDecl,
}
impl AST {
    /// Builds AST from the BEAM file
    pub fn from_beam_file<P: AsRef<Path>>(beam_file: P) -> result::FromBeamResult<Self> {
        let code = try!(format::raw_abstract_v1::AbstractCode::from_beam_file(beam_file));
        let forms = try!(code.to_forms());
        Ok(AST { module: ast::ModuleDecl { forms: forms } })
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn it_works() {
        AST::from_beam_file("src/testdata/test.beam")
            .map_err(|err| {
                println!("[ERROR] {}", err);
                "Failed"
            })
            .unwrap();
    }
}