lang_pt 0.1.2

use crate::production::{Hidden, ProductionLogger};
use crate::Code;
use crate::{
    Cache, FltrPtr, IProduction, ImplementationError, ParsedResult, SuccessData, TokenPtr,
    TokenStream,
};
use once_cell::unsync::OnceCell;
use std::{
    collections::{HashMap, HashSet},
    fmt::Display,
    rc::Rc,
};

impl<TProd: IProduction> Hidden<TProd> {
    pub fn new(production: &Rc<TProd>) -> Self {
        Self {
            rule_name: OnceCell::new(),
            production: production.clone(),
            debugger: OnceCell::new(),
        }
    }
    pub fn hidden(production: &Rc<TProd>) -> Self {
        Self {
            rule_name: OnceCell::new(),
            production: production.clone(),
            debugger: OnceCell::new(),
        }
    }
    #[inline]
    pub fn get_production(&self) -> &TProd {
        &self.production
    }
    pub fn set_rule_name(&self, s: &'static str) -> Result<(), String> {
        self.rule_name
            .set(s)
            .map_err(|err| format!("Rule name {} is already assigned", err))
    }
}

impl<TP: IProduction> Hidden<TP> {
    pub fn set_log(&self, debugger: crate::Log<&'static str>) -> Result<(), String> {
        self.debugger
            .set(debugger)
            .map_err(|err| format!("Debugger {} is already set for this production.", err))
    }
}

impl<TProd: IProduction> ProductionLogger for Hidden<TProd> {
    fn get_debugger(&self) -> Option<&crate::Log<&'static str>> {
        self.debugger.get()
    }
}

impl<TProd: IProduction> Display for Hidden<TProd> {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self.rule_name.get() {
            Some(&s) => write!(f, "{}", s),
            None => {
                write!(f, "[{};]", self.get_production())
            }
        }
    }
}
impl<TProd: IProduction> IProduction for Hidden<TProd> {
    type Node = TProd::Node;
    type Token = TProd::Token;

    #[inline]
    fn is_nullable(&self) -> bool {
        self.get_production().is_nullable()
    }

    fn impl_grammar(
        &self,
        writer: &mut dyn std::fmt::Write,
        visited: &mut HashSet<&'static str>,
    ) -> Result<(), std::fmt::Error> {
        match self.rule_name.get() {
            Some(&s) => {
                if visited.insert(s.into()) {
                    writeln!(writer, "{}", s)?;
                    writeln!(writer, "{:>6} [{};]", ":", self.get_production())?;
                    writeln!(writer, "{:>6}", ";")?;
                }
            }
            None => {}
        }

        self.production.impl_grammar(writer, visited)
    }

    fn obtain_nullability<'id>(
        &'id self,
        visited: HashMap<&'id str, usize>,
    ) -> Result<bool, ImplementationError> {
        self.production.obtain_nullability(visited)
    }

    fn impl_first_set<'prod>(&'prod self, first_set: &mut HashSet<TProd::Token>) {
        self.production.impl_first_set(first_set)
    }
    fn is_nullable_n_hidden(&self) -> bool {
        self.is_nullable()
    }

    #[inline]
    fn validate<'id>(
        &'id self,
        first_sets: HashMap<&'id str, usize>,
        visited_prod: &mut HashSet<&'id str>,
    ) -> Result<(), ImplementationError> {
        // println!("Validating Hidden:{}", self.get_id());
        self.get_production().validate(first_sets, visited_prod)
    }

    fn advance_fltr_ptr(
        &self,
        code: &Code,
        index: FltrPtr,
        token_stream: &TokenStream<Self::Token>,
        cached: &mut Cache<FltrPtr, Self::Node>,
    ) -> ParsedResult<FltrPtr, Self::Node> {
        #[cfg(debug_assertions)]
        self.log_entry();

        let result = self
            .get_production()
            .advance_fltr_ptr(code, index, token_stream, cached)
            .map(|parsed_data| SuccessData::hidden(parsed_data.consumed_index));

        #[cfg(debug_assertions)]
        self.log_filtered_result(code, index, token_stream, &result);

        result
    }

    fn advance_token_ptr(
        &self,
        code: &Code,
        index: TokenPtr,
        token_stream: &TokenStream<Self::Token>,
        cache: &mut Cache<FltrPtr, Self::Node>,
    ) -> ParsedResult<TokenPtr, Self::Node> {
        #[cfg(debug_assertions)]
        self.log_entry();

        let result = self
            .get_production()
            .advance_token_ptr(code, index, token_stream, cache)
            .map(|parsed_data| SuccessData::hidden(parsed_data.consumed_index));

        #[cfg(debug_assertions)]
        self.log_lex_result(code, index, token_stream, &result);

        result
    }

    fn advance_ptr(
        &self,
        code: &Code,
        index: usize,
        cache: &mut Cache<usize, Self::Node>,
    ) -> ParsedResult<usize, Self::Node> {
        #[cfg(debug_assertions)]
        self.log_entry();

        let result = self
            .get_production()
            .advance_ptr(code, index, cache)
            .map(|parsed_data| SuccessData::hidden(parsed_data.consumed_index));

        #[cfg(debug_assertions)]
        self.log_result(code, index, &result);

        result
    }
}