braillify 2.0.0

Rust 기반 크로스플랫폼 한국어 점역 라이브러리
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//! 수학 제8항 — 소수점 표기.
//!
//! 소수점(⠲)과 선행 소수(.47)의 수표 부여를 처리한다.

use crate::rules::math::parser::MathToken;

use super::math_token_rule::{MathEncodeState, MathTokenEngine, MathTokenResult, MathTokenRule};

pub fn encode_decimal_point(
    tokens: &[MathToken],
    i: usize,
    prev_was_number: &mut bool,
    result: &mut Vec<u8>,
) {
    if !*prev_was_number {
        let has_next_number = match tokens.get(i + 1) {
            Some(MathToken::Number(_)) => true,
            Some(MathToken::MathSymbol('\u{0307}')) => {
                matches!(tokens.get(i + 2), Some(MathToken::Number(_)))
            }
            _ => false,
        };
        if has_next_number {
            result.push(60);
            *prev_was_number = true;
        }
    }
    result.push(50);
}

pub struct DecimalPointRule;

impl MathTokenRule for DecimalPointRule {
    fn name(&self) -> &'static str {
        "DecimalPointRule"
    }

    fn priority(&self) -> u16 {
        50
    }

    fn matches(&self, tokens: &[MathToken], index: usize, _state: &MathEncodeState) -> bool {
        matches!(tokens.get(index), Some(MathToken::DecimalPoint))
    }

    fn apply(
        &self,
        tokens: &[MathToken],
        index: usize,
        result: &mut Vec<u8>,
        state: &mut MathEncodeState,
        _engine: &MathTokenEngine,
    ) -> Result<MathTokenResult, String> {
        encode_decimal_point(tokens, index, &mut state.prev_was_number, result);
        Ok(MathTokenResult::Consumed(1))
    }
}