79 lines
2.7 KiB
Rust
79 lines
2.7 KiB
Rust
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/*!
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* Function declaration parsing
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*/
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use crate::parser::{NyashParser, ParseError};
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use crate::parser::common::ParserUtils;
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use crate::tokenizer::TokenType;
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use crate::ast::{ASTNode, Span};
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use crate::must_advance;
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impl NyashParser {
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/// function宣言をパース: function name(params) { body }
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pub fn parse_function_declaration(&mut self) -> Result<ASTNode, ParseError> {
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self.consume(TokenType::FUNCTION)?;
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// 関数名を取得
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let name = if let TokenType::IDENTIFIER(name) = &self.current_token().token_type {
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let name = name.clone();
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self.advance();
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name
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} else {
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let line = self.current_token().line;
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return Err(ParseError::UnexpectedToken {
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found: self.current_token().token_type.clone(),
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expected: "function name".to_string(),
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line,
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});
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};
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// パラメータリストをパース
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self.consume(TokenType::LPAREN)?;
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let mut params = Vec::new();
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while !self.match_token(&TokenType::RPAREN) && !self.is_at_end() {
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must_advance!(self, _unused, "function declaration parameter parsing");
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if let TokenType::IDENTIFIER(param) = &self.current_token().token_type {
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params.push(param.clone());
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self.advance();
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if self.match_token(&TokenType::COMMA) {
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self.advance();
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}
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} else if !self.match_token(&TokenType::RPAREN) {
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let line = self.current_token().line;
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return Err(ParseError::UnexpectedToken {
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found: self.current_token().token_type.clone(),
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expected: "parameter name".to_string(),
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line,
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});
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}
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}
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self.consume(TokenType::RPAREN)?;
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// 関数本体をパース
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self.consume(TokenType::LBRACE)?;
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self.skip_newlines();
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let mut body = Vec::new();
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while !self.match_token(&TokenType::RBRACE) && !self.is_at_end() {
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self.skip_newlines();
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if !self.match_token(&TokenType::RBRACE) {
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body.push(self.parse_statement()?);
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}
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}
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self.consume(TokenType::RBRACE)?;
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Ok(ASTNode::FunctionDeclaration {
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name,
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params,
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body,
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is_static: false, // 通常の関数は静的でない
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is_override: false, // デフォルトは非オーバーライド
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span: Span::unknown(),
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})
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}
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}
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