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|
use super::parser::Parser;
use {SyntaxKind};
use syntax_kinds::*;
// Items //
pub fn file(p: &mut Parser) {
node(p, FILE, |p| {
shebang(p);
inner_attributes(p);
many(p, |p| {
skip_to_first(
p, item_first, item,
"expected item",
)
});
})
}
fn shebang(_: &mut Parser) {
//TODO
}
fn inner_attributes(_: &mut Parser) {
//TODO
}
fn item_first(p: &Parser) -> bool {
match p.current() {
Some(STRUCT_KW) => true,
_ => false,
}
}
fn item(p: &mut Parser) {
outer_attributes(p);
visibility(p);
node_if(p, STRUCT_KW, STRUCT_ITEM, struct_item);
}
fn struct_item(p: &mut Parser) {
p.expect(IDENT)
&& p.curly_block(|p| comma_list(p, struct_field));
}
fn struct_field(p: &mut Parser) -> bool {
node_if(p, IDENT, STRUCT_FIELD, |p| {
p.expect(COLON) && p.expect(IDENT);
})
}
// Paths, types, attributes, and stuff //
fn outer_attributes(_: &mut Parser) {
}
fn visibility(_: &mut Parser) {
}
// Expressions //
// Error recovery and high-order utils //
fn node_if<F: FnOnce(&mut Parser)>(p: &mut Parser, first: SyntaxKind, node_kind: SyntaxKind, rest: F) -> bool {
p.current_is(first) && { node(p, node_kind, |p| { p.bump(); rest(p); }); true }
}
fn node<F: FnOnce(&mut Parser)>(p: &mut Parser, node_kind: SyntaxKind, rest: F) {
p.start(node_kind);
rest(p);
p.finish();
}
fn many<F: Fn(&mut Parser) -> bool>(p: &mut Parser, f: F) {
while f(p) { }
}
fn comma_list<F: Fn(&mut Parser) -> bool>(p: &mut Parser, f: F) {
many(p, |p| {
f(p);
if p.is_eof() {
false
} else {
p.expect(COMMA);
true
}
})
}
fn skip_to_first<C, F>(p: &mut Parser, cond: C, f: F, message: &str) -> bool
where
C: Fn(&Parser) -> bool,
F: FnOnce(&mut Parser),
{
let mut skipped = false;
loop {
if cond(p) {
if skipped {
p.finish();
}
f(p);
return true;
}
if p.is_eof() {
if skipped {
p.finish();
}
return false;
}
if !skipped {
p.start(ERROR);
p.error()
.message(message)
.emit();
}
p.bump().unwrap();
skipped = true;
}
}
impl<'p> Parser<'p> {
fn current_is(&self, kind: SyntaxKind) -> bool {
self.current() == Some(kind)
}
pub(crate) fn expect(&mut self, kind: SyntaxKind) -> bool {
if self.current_is(kind) {
self.bump();
true
} else {
self.error()
.message(format!("expected {:?}", kind))
.emit();
false
}
}
}
|
