forked from AbleScript/ablescript
Parser cleanup
This commit is contained in:
ondra05
parent
8e6dd4bdcf
commit
16ac372c5d
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@ -66,39 +66,15 @@ impl<'source> Parser<'source> {
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let start = self.lexer.span().start;
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match token {
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Token::Unless => Ok(Spanned::new(
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self.unless_flow()?,
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start..self.lexer.span().end,
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)),
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Token::Functio => Ok(Spanned::new(
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self.functio_flow()?,
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start..self.lexer.span().end,
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)),
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Token::Bff => Ok(Spanned::new(self.bff_flow()?, start..self.lexer.span().end)),
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Token::Melo => Ok(Spanned::new(
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self.melo_flow()?,
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start..self.lexer.span().end,
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)),
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Token::Loop => Ok(Spanned::new(
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self.loop_flow()?,
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start..self.lexer.span().end,
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)),
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Token::Enough => Ok(Spanned::new(
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self.semicolon_terminated(Stmt::Enough)?,
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start..self.lexer.span().end,
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)),
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Token::AndAgain => Ok(Spanned::new(
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self.semicolon_terminated(Stmt::AndAgain)?,
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start..self.lexer.span().end,
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)),
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Token::Rlyeh => Ok(Spanned::new(
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self.semicolon_terminated(Stmt::Rlyeh)?,
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start..self.lexer.span().end,
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)),
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Token::Rickroll => Ok(Spanned::new(
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self.semicolon_terminated(Stmt::Rickroll)?,
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start..self.lexer.span().end,
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)),
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Token::Unless => self.unless_flow(),
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Token::Functio => self.functio_flow(),
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Token::Bff => self.bff_flow(),
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Token::Melo => self.melo_flow(),
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Token::Loop => self.loop_flow(),
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Token::Enough => self.semicolon_terminated(Stmt::Enough),
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Token::AndAgain => self.semicolon_terminated(Stmt::AndAgain),
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Token::Rlyeh => self.semicolon_terminated(Stmt::Rlyeh),
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Token::Rickroll => self.semicolon_terminated(Stmt::Rickroll),
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Token::Identifier(_)
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| Token::String(_)
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@ -106,16 +82,14 @@ impl<'source> Parser<'source> {
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| Token::Char(_)
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| Token::Aint
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| Token::LeftBracket
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| Token::LeftParen => Ok(Spanned::new(
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self.value_flow(token)?,
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start..self.lexer.span().end,
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)),
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| Token::LeftParen => self.value_flow(token),
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t => Err(Error {
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kind: ErrorKind::UnexpectedToken(t),
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span: start..self.lexer.span().end,
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}),
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}
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.map(|stmt| Spanned::new(stmt, start..self.lexer.span().end))
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}
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/// Require statement to be semicolon terminated
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@ -161,43 +135,21 @@ impl<'source> Parser<'source> {
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match token {
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// Values
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Token::Identifier(i) => Ok(Spanned::new(
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Expr::Variable(self.tdark_subst(i)),
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start..self.lexer.span().end,
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)),
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Token::Integer(i) => Ok(Spanned::new(
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Expr::Literal(Literal::Int(i)),
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start..self.lexer.span().end,
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)),
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Token::String(s) => Ok(Spanned::new(
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Expr::Literal(Literal::Str(self.tdark_subst(s))),
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start..self.lexer.span().end,
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)),
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Token::Char(c) => Ok(Spanned::new(
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Expr::Literal(Literal::Char(c)),
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start..self.lexer.span().end,
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)),
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Token::Identifier(i) => Ok(Expr::Variable(self.tdark_subst(i))),
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Token::Integer(i) => Ok(Expr::Literal(Literal::Int(i))),
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Token::String(s) => Ok(Expr::Literal(Literal::Str(self.tdark_subst(s)))),
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Token::Char(c) => Ok(Expr::Literal(Literal::Char(c))),
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Token::LeftBracket => match buf.take() {
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Some(buf) => Ok(Spanned::new(
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self.index_flow(buf)?,
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start..self.lexer.span().end,
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)),
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None => Ok(Spanned::new(
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self.cart_flow()?,
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start..self.lexer.span().end,
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)),
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Some(buf) => self.index_flow(buf),
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None => self.cart_flow(),
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},
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// Operations
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Token::Aint if buf.is_none() => Ok(Spanned::new(
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{
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let next = self.checked_next()?;
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Expr::Aint(Box::new(self.parse_expr(next, buf)?))
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},
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start..self.lexer.span().end,
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)),
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Token::Aint if buf.is_none() => {
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let next = self.checked_next()?;
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Ok(Expr::Aint(Box::new(self.parse_expr(next, buf)?)))
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}
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Token::Plus
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| Token::Minus
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| Token::Star
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@ -205,17 +157,15 @@ impl<'source> Parser<'source> {
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| Token::Equals
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| Token::LessThan
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| Token::GreaterThan
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| Token::Aint => Ok(Spanned::new(
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self.binop_flow(
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BinOpKind::from_token(token).map_err(|e| Error::new(e, self.lexer.span()))?,
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buf,
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)?,
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start..self.lexer.span().end,
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)),
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| Token::Aint => self.binop_flow(
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BinOpKind::from_token(token).map_err(|e| Error::new(e, self.lexer.span()))?,
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buf,
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),
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Token::LeftParen => self.expr_flow(Token::RightParen),
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Token::LeftParen => return self.expr_flow(Token::RightParen),
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t => Err(Error::new(ErrorKind::UnexpectedToken(t), self.lexer.span())),
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}
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.map(|expr| Spanned::new(expr, start..self.lexer.span().end))
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}
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/// Flow for creating carts
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@ -358,7 +308,7 @@ impl<'source> Parser<'source> {
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/// will parse it to function call or print statement.
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fn value_flow(&mut self, init: Token) -> Result<Stmt, Error> {
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let mut buf = Some(self.parse_expr(init, &mut None)?);
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let r = loop {
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Ok(loop {
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match self.checked_next()? {
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// Print to stdout
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Token::Print => {
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@ -443,9 +393,7 @@ impl<'source> Parser<'source> {
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t => buf = Some(self.parse_expr(t, &mut buf)?),
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}
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};
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Ok(r)
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})
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}
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/// Parse Unless flow
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