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Moved conditionals to delimiter_block! syntax

This commit is contained in:
greg 2017-01-05 02:51:41 -08:00
parent db92292569
commit 9801f53a17
1 changed files with 16 additions and 35 deletions
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51
src/parser.rs
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@ -163,14 +163,14 @@ macro_rules! expect_identifier {
}
macro_rules! delimiter_block {
($_self:expr, $try_parse: ident, $break_pattern: pat) => {
($_self:expr, $try_parse: ident, $($break_pattern: pat)|+) => {
{
let mut acc = Vec::new();
loop {
match $_self.peek() {
None => break,
Some(ref t) if is_delimiter(t) => { $_self.next(); continue; },
$break_pattern => break,
$($break_pattern)|+ => break,
_ => {
let a = try!($_self.$try_parse());
acc.push(a);
@ -374,6 +374,7 @@ impl Parser {
expect!(self, Keyword(Kw::If));
let test = try!(self.expression());
loop {
match self.peek() {
Some(ref t) if is_delimiter(t) => {
@ -385,39 +386,19 @@ impl Parser {
}
expect!(self, Keyword(Kw::Then));
let mut then_block = VecDeque::new();
loop {
match self.peek() {
None |
Some(Keyword(Kw::Else)) |
Some(Keyword(Kw::End)) => break,
Some(ref t) if is_delimiter(t) => {
self.next();
continue;
}
_ => {
let exp = try!(self.expression());
then_block.push_back(exp);
}
}
}
let then_block = delimiter_block!(
self,
expression,
Some(Keyword(Kw::Else)) | Some(Keyword(Kw::End))
);
let else_block = if let Some(Keyword(Kw::Else)) = self.peek() {
self.next();
let mut else_exprs = VecDeque::new();
loop {
match self.peek() {
None |
Some(Keyword(Kw::End)) => break,
Some(Semicolon) | Some(Newline) => {
self.next();
continue;
}
_ => {
let exp = try!(self.expression());
else_exprs.push_back(exp);
}
}
}
let else_exprs = delimiter_block!(
self,
expression,
Some(Keyword(Kw::End))
);
Some(else_exprs)
} else {
None
@ -425,8 +406,8 @@ impl Parser {
expect!(self, Keyword(Kw::End));
Ok(Conditional(Box::new(test),
Box::new(Block(then_block)),
else_block.map(|list| Box::new(Block(list)))))
Box::new(Block(VecDeque::from(then_block))),
else_block.map(|list| Box::new(Block(VecDeque::from(list))))))
}
fn identifier_expr(&mut self) -> ParseResult<Expression> {