incrust 0.0.15

Template engine inspired by Jinja2
Documentation 
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use std::collections::hash_map::{HashMap};
use std::fmt::{Display, Debug};
use std::iter::Iterator;
use std::slice::Iter;

use ::abc::CloneError;


// --------------------------------------------------------------------------------------------------------------------

pub type Args<'a> = HashMap<EntityId<'a>, BType<'a>>;

// TODO EntityId: String vs &'static str
//pub type EntityId = String;
pub type EntityId<'a> = &'a str;

pub type BType<'a> = Box<Type + 'a>;
pub trait Type: ToIString + IArithm + ToINumeric + IClone + AsIIter + Send + Sync + Debug {
    fn to_bool(self: &Self) -> bool;
}


pub fn ex<'a, A>(v: A) -> BType<'a> where A: Into<BType<'a>> { v.into() }


// TODO enum { Box, Borrow } ?
pub struct Var;
//impl Ex for Var {
//    default fn ex<'a, A, T>(v: A) -> Box<Type + 'a> where A: Into<T>, T: Type + 'a { Box::new(v.into()) }
//}


// --- [ interfaces ] -------------------------------------------------------------------------------------------------

pub trait IClone {
    fn iclone<'a>(self: &Self) -> Result<BType<'a>, CloneError>;
}

pub trait ToIString {
    fn to_istring(self: &Self) -> Option<String>;
}

pub trait ToINumeric {
    fn to_real(self: &Self) -> Option<f64>;
    fn to_int(self: &Self) -> Option<isize>;
}

pub trait IArithm {
    fn iadd(self: Box<Self>, other: BType) -> Option<BType>;
    fn isub(self: Box<Self>, other: BType) -> Option<BType>;
    fn imul(self: Box<Self>, other: BType) -> Option<BType>;
    fn idiv(self: Box<Self>, other: BType) -> Option<BType>;
}

pub trait AsIIter {
    fn as_iiter<'a, 'c: 'a>(&'c self) -> Option<&'a IIter<'a>>;
}

pub trait IIter<'a>: Send + Sync {
    fn is_empty(self: &Self) -> bool;
//    fn len(self: &Self) -> usize;
    fn ivalues(self: &Self) -> VIterator;
}

pub struct VIterator<'a> {
    pub me: Iter<'a, BType<'a>>,
}


//pub trait IMap {
//    fn ivalues(self: &Self) -> Option<Box<Iterator<Item=BType>>>;
////    fn ikeys(self: &Self) -> Option<KIterator>;
////    fn ikeyvalues(self: &Self) -> Option<KVIterator>;
//}

pub trait AsIIndexable {
    fn as_iindexable<'a>(self: &Self) -> Option<&IIndexable<'a>>;
}

pub trait IIndexable<'a>: Send + Sync {
    fn has_index(self: &Self, index: usize) -> bool;
    fn get_index(self: &Self, index: usize) -> &BType;
//    fn as_slice(self: &Self, range: Range) -> &[BType];
}



// --- [ default implementations ] ------------------------------------------------------------------------------------

impl <T> AsIIter for T where T: Type {
    default fn as_iiter<'a, 'c: 'a>(&'c self) -> Option<&'a IIter<'a>> { None }
}

impl <'a> Iterator for VIterator<'a> {
    type Item = BType<'a>;

    fn next(&mut self) -> Option<BType<'a>> {
        if let Some(next) = self.me.next() {
            if let Ok(next) = next.iclone() {
                return Some(next)
            }
        }
        None
    }
}




impl <T> IClone for T where T: Type {
    default fn iclone<'a>(self: &Self) -> Result<BType<'a>, CloneError> { Err(CloneError::Error) }
}

impl <T> ToIString for T where T: Type {
    default fn to_istring(self: &Self) -> Option<String> { None }
}

impl <T> ToIString for T where T: Type + Display {
    default fn to_istring(self: &Self) -> Option<String> { Some( <Self as ToString>::to_string(self)) }
}

impl <T> ToINumeric for T where T: Type {
    default fn to_real(self: &Self) -> Option<f64> { None }
    default fn to_int(self: &Self) -> Option<isize> { None }
}

#[cfg_attr(feature = "clippy", allow(boxed_local))]
impl <S> IArithm for S where S: Type {
    default fn iadd(self: Box<Self>, _other: BType) -> Option<BType> { None }
    default fn isub(self: Box<Self>, _other: BType) -> Option<BType> { None }
    default fn imul(self: Box<Self>, _other: BType) -> Option<BType> { None }
    default fn idiv(self: Box<Self>, _other: BType) -> Option<BType> { None }
}


//impl <T> IMap for T where T: Type {
//    default fn ivalues(self: &Self) -> Option<Box<Iterator<Item=BType>>> { None }
////    default fn ikeys(self: &Self) -> Option<KIterator> { None }
////    default fn ikeyvalues(self: &Self) -> Option<KVIterator> { None }
//}