122 lines
3.9 KiB
Rust
122 lines
3.9 KiB
Rust
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/*!
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* Parser Common Utilities
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*
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* パーサーモジュール間で共有されるヘルパー関数や型定義
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* Extracted from parser/mod.rs as part of modularization
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*/
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use crate::tokenizer::{Token, TokenType};
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use crate::ast::Span;
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use super::ParseError;
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/// Parser utility methods
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pub trait ParserUtils {
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fn tokens(&self) -> &Vec<Token>;
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fn current(&self) -> usize;
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fn current_mut(&mut self) -> &mut usize;
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/// 現在のトークンを取得
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fn current_token(&self) -> &Token {
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self.tokens().get(self.current()).unwrap_or(&Token {
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token_type: TokenType::EOF,
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line: 0,
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column: 0,
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})
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}
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/// 次のトークンを先読み（位置を進めない）
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fn peek_token(&self) -> &TokenType {
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if self.current() + 1 < self.tokens().len() {
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&self.tokens()[self.current() + 1].token_type
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} else {
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&TokenType::EOF
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}
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}
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/// N個先のトークンを先読み
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fn peek_nth_token(&self, n: usize) -> &TokenType {
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if self.current() + n < self.tokens().len() {
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&self.tokens()[self.current() + n].token_type
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} else {
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&TokenType::EOF
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}
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}
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/// 位置を1つ進める
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fn advance(&mut self) {
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if !self.is_at_end() {
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*self.current_mut() += 1;
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}
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}
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/// NEWLINEトークンをスキップ
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fn skip_newlines(&mut self) {
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while matches!(self.current_token().token_type, TokenType::NEWLINE) && !self.is_at_end() {
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self.advance();
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}
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}
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/// 指定されたトークンタイプを消費 (期待通りでなければエラー)
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fn consume(&mut self, expected: TokenType) -> Result<Token, ParseError> {
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if std::mem::discriminant(&self.current_token().token_type) ==
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std::mem::discriminant(&expected) {
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let token = self.current_token().clone();
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self.advance();
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Ok(token)
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} else {
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let line = self.current_token().line;
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Err(ParseError::UnexpectedToken {
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found: self.current_token().token_type.clone(),
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expected: format!("{:?}", expected),
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line,
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})
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}
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}
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/// 現在のトークンが指定されたタイプかチェック
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fn match_token(&self, token_type: &TokenType) -> bool {
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std::mem::discriminant(&self.current_token().token_type) ==
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std::mem::discriminant(token_type)
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}
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/// 複数のトークンタイプのいずれかにマッチするかチェック
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fn match_any_token(&self, token_types: &[TokenType]) -> bool {
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let current_discriminant = std::mem::discriminant(&self.current_token().token_type);
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token_types.iter().any(|tt| {
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std::mem::discriminant(tt) == current_discriminant
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})
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}
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/// 終端に達したかチェック
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fn is_at_end(&self) -> bool {
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self.current() >= self.tokens().len() ||
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matches!(self.current_token().token_type, TokenType::EOF)
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}
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/// 現在のトークンが行の終わり（NEWLINE or EOF）かチェック
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fn is_line_end(&self) -> bool {
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matches!(self.current_token().token_type, TokenType::NEWLINE | TokenType::EOF)
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}
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/// エラー報告用の現在位置情報を取得
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fn current_position(&self) -> (usize, usize) {
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let token = self.current_token();
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(token.line, token.column)
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}
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/// 現在のトークンからSpanを作成
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fn current_span(&self) -> Span {
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let token = self.current_token();
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Span {
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start: 0, // Token doesn't have byte offset, so using 0
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end: 0,
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line: token.line,
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column: token.column,
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}
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}
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}
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/// Helper function to create unknown span
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pub fn unknown_span() -> Span {
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Span::unknown()
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}
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