74 lines
1.5 KiB
Rust
74 lines
1.5 KiB
Rust
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use {
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std::iter::Peekable,
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crate::{
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lexer::{LTIRLexer, LTIRToken, LexError},
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expr::LTExpr
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}
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};
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#[derive(Clone, Debug)]
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pub enum ParseError {
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LexError(LexError),
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UnexpectedClose,
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UnexpectedEnd,
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UnexpectedToken
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}
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pub fn parse_statement<It>(
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tokens: &mut Peekable<LTIRLexer<It>>
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) -> Result< crate::expr::Statement, ParseError >
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where It: Iterator<Item = char>
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{
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Err(ParseError::UnexpectedEnd)
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}
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pub fn parse_block<It>(
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tokens: &mut Peekable<LTIRLexer<It>>
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) -> Result< crate::expr::LTExpr, ParseError >
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where It: Iterator<Item = char>
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{
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Err(ParseError::UnexpectedEnd)
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}
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pub fn parse_expr<It>(
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tokens: &mut Peekable<LTIRLexer<It>>
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) -> Result< crate::expr::LTExpr, ParseError >
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where It: Iterator<Item = char>
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{
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let mut children = Vec::new();
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match tokens.next() {
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Some(Ok(LTIRToken::ExprOpen)) => {
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if let Ok(subexpr) = parse_expr( tokens ) {
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} else {
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}
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/*
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Err(ParseError::UnexpectedEnd)
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*/
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},
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Some(Ok(LTIRToken::BlockOpen)) => {
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/*
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Err(ParseError::UnexpectedEnd)
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*/
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}
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/*
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_ => Err(ParseError::UnexpectedToken),
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None => Err(ParseError::UnexpectedEnd)
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*/
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_ => {}
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}
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if children.len() > 0 {
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let head = children.remove(0);
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Ok(LTExpr::Application {
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head: Box::new(head),
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body: children
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})
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} else {
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Err(ParseError::UnexpectedEnd)
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}
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}
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