33 lines
824 B
Rust
33 lines
824 B
Rust
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use super::NyashTokenizer;
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impl NyashTokenizer {
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/// 現在の文字を取得
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pub(crate) fn current_char(&self) -> Option<char> {
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self.input.get(self.position).copied()
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}
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/// 次の文字を先読み
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pub(crate) fn peek_char(&self) -> Option<char> {
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self.input.get(self.position + 1).copied()
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}
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/// 1文字進める（行/列も更新）
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pub(crate) fn advance(&mut self) {
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if let Some(c) = self.current_char() {
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self.position += 1;
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if c == '\n' {
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self.line += 1;
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self.column = 1;
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} else {
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self.column += 1;
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}
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}
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}
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/// 入力の終端に到達しているか
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pub(crate) fn is_at_end(&self) -> bool {
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self.position >= self.input.len()
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}
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}
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