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Remove 0..0 placeholder from unexpected_eof()

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This commit is contained in:
Alex Bethel 2021-06-07 20:03:26 -05:00
parent ce20611c07
commit a0c1f93392
2 changed files with 53 additions and 13 deletions
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6
src/error.rs
View file

@ -28,7 +28,9 @@ impl Error {
Self { kind, span }
}
pub fn unexpected_eof() -> Self {
Self::new(ErrorKind::UnexpectedEof, 0..0)
/// Create an UnexpectedEof error, where the EOF occurs at the
/// given index in the file.
pub fn unexpected_eof(index: usize) -> Self {
Self::new(ErrorKind::UnexpectedEof, index..index)
}
}

60
src/parser.rs
View file

@ -109,13 +109,17 @@ impl<'source> Parser<'source> {
match self.lexer.next() {
Some(t) if t == expected => Ok(()),
Some(t) => Err(Error::new(ErrorKind::UnexpectedToken(t), self.lexer.span())),
None => Err(Error::unexpected_eof()),
None => Err(Error::unexpected_eof(self.lexer.span().start)),
}
}
/// Get an Identifier
fn get_iden(&mut self) -> Result<Iden, Error> {
match self.lexer.next().ok_or(Error::unexpected_eof())? {
match self
.lexer
.next()
.ok_or(Error::unexpected_eof(self.lexer.span().start))?
{
Token::Identifier(iden) => Ok(Iden {
iden: if self.tdark {
iden.replace("lang", "script")
@ -194,7 +198,10 @@ impl<'source> Parser<'source> {
Token::Not => Ok(Expr::new(
{
let next = self.lexer.next().ok_or(Error::unexpected_eof())?;
let next = self
.lexer
.next()
.ok_or(Error::unexpected_eof(self.lexer.span().start))?;
ExprKind::Not(Box::new(self.parse_expr(next, buf)?))
},
start..self.lexer.span().end,
@ -219,7 +226,10 @@ impl<'source> Parser<'source> {
.ok_or(Error::new(ErrorKind::MissingLhs, self.lexer.span()))?,
),
rhs: {
let next = self.lexer.next().ok_or(Error::unexpected_eof())?;
let next = self
.lexer
.next()
.ok_or(Error::unexpected_eof(self.lexer.span().start))?;
Box::new(self.parse_expr(next, &mut None)?)
},
kind,
@ -230,7 +240,11 @@ impl<'source> Parser<'source> {
fn expr_flow(&mut self, terminate: Token) -> Result<Expr, Error> {
let mut buf = None;
Ok(loop {
match self.lexer.next().ok_or(Error::unexpected_eof())? {
match self
.lexer
.next()
.ok_or(Error::unexpected_eof(self.lexer.span().start))?
{
t if t == terminate => {
break buf
.take()
@ -247,7 +261,11 @@ impl<'source> Parser<'source> {
let mut block = vec![];
loop {
match self.lexer.next().ok_or(Error::unexpected_eof())? {
match self
.lexer
.next()
.ok_or(Error::unexpected_eof(self.lexer.span().start))?
{
Token::RightCurly => break,
t => block.push(self.parse(t)?),
}
@ -261,7 +279,11 @@ impl<'source> Parser<'source> {
fn value_flow(&mut self, init: Token) -> Result<StmtKind, Error> {
let mut buf = Some(self.parse_expr(init, &mut None)?);
let r = loop {
match self.lexer.next().ok_or(Error::unexpected_eof())? {
match self
.lexer
.next()
.ok_or(Error::unexpected_eof(self.lexer.span().start))?
{
Token::Print => {
break StmtKind::Print(buf.take().ok_or(Error::new(
ErrorKind::UnexpectedToken(Token::Print),
@ -308,13 +330,21 @@ impl<'source> Parser<'source> {
let mut args = vec![];
loop {
match self.lexer.next().ok_or(Error::unexpected_eof())? {
match self
.lexer
.next()
.ok_or(Error::unexpected_eof(self.lexer.span().start))?
{
Token::RightParen => break,
Token::Identifier(i) => {
args.push(Iden::new(i, self.lexer.span()));
// Require comma (next) or right paren (end) after identifier
match self.lexer.next().ok_or(Error::unexpected_eof())? {
match self
.lexer
.next()
.ok_or(Error::unexpected_eof(self.lexer.span().start))?
{
Token::Comma => continue,
Token::RightParen => break,
t => {
@ -339,7 +369,11 @@ impl<'source> Parser<'source> {
let mut args = vec![];
let mut buf = None;
loop {
match self.lexer.next().ok_or(Error::unexpected_eof())? {
match self
.lexer
.next()
.ok_or(Error::unexpected_eof(self.lexer.span().start))?
{
// End of argument list
Token::RightParen => {
if let Some(expr) = buf.take() {
@ -369,7 +403,11 @@ impl<'source> Parser<'source> {
/// Parse variable declaration
fn var_flow(&mut self) -> Result<StmtKind, Error> {
let iden = self.get_iden()?;
let init = match self.lexer.next().ok_or(Error::unexpected_eof())? {
let init = match self
.lexer
.next()
.ok_or(Error::unexpected_eof(self.lexer.span().start))?
{
Token::Equal => Some(self.expr_flow(Token::Semicolon)?),
Token::Semicolon => None,
t => return Err(Error::new(ErrorKind::UnexpectedToken(t), self.lexer.span())),