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pub use self::ObsoleteSyntax::*;
use ast::{Expr, ExprTup};
use codemap::Span;
use parse::parser;
use parse::token;
use ptr::P;
#[deriving(Copy, PartialEq, Eq, Hash)]
pub enum ObsoleteSyntax {
ObsoleteOwnedType,
ObsoleteOwnedExpr,
ObsoleteOwnedPattern,
ObsoleteOwnedVector,
ObsoleteOwnedSelf,
ObsoleteImportRenaming,
ObsoleteSubsliceMatch,
ObsoleteExternCrateRenaming,
ObsoleteProcType,
ObsoleteProcExpr,
}
pub trait ParserObsoleteMethods {
fn obsolete(&mut self, sp: Span, kind: ObsoleteSyntax);
fn obsolete_expr(&mut self, sp: Span, kind: ObsoleteSyntax) -> P<Expr>;
fn report(&mut self,
sp: Span,
kind: ObsoleteSyntax,
kind_str: &str,
desc: &str);
fn is_obsolete_ident(&mut self, ident: &str) -> bool;
fn eat_obsolete_ident(&mut self, ident: &str) -> bool;
}
impl<'a> ParserObsoleteMethods for parser::Parser<'a> {
fn obsolete(&mut self, sp: Span, kind: ObsoleteSyntax) {
let (kind_str, desc) = match kind {
ObsoleteProcType => (
"the `proc` type",
"use unboxed closures instead",
),
ObsoleteProcExpr => (
"`proc` expression",
"use a `move ||` expression instead",
),
ObsoleteOwnedType => (
"`~` notation for owned pointers",
"use `Box<T>` in `std::owned` instead"
),
ObsoleteOwnedExpr => (
"`~` notation for owned pointer allocation",
"use the `box` operator instead of `~`"
),
ObsoleteOwnedPattern => (
"`~` notation for owned pointer patterns",
"use the `box` operator instead of `~`"
),
ObsoleteOwnedVector => (
"`~[T]` is no longer a type",
"use the `Vec` type instead"
),
ObsoleteOwnedSelf => (
"`~self` is no longer supported",
"write `self: Box<Self>` instead"
),
ObsoleteImportRenaming => (
"`use foo = bar` syntax",
"write `use bar as foo` instead"
),
ObsoleteSubsliceMatch => (
"subslice match syntax",
"instead of `..xs`, write `xs..` in a pattern"
),
ObsoleteExternCrateRenaming => (
"`extern crate foo = bar` syntax",
"write `extern crate bar as foo` instead"
)
};
self.report(sp, kind, kind_str, desc);
}
fn obsolete_expr(&mut self, sp: Span, kind: ObsoleteSyntax) -> P<Expr> {
self.obsolete(sp, kind);
self.mk_expr(sp.lo, sp.hi, ExprTup(vec![]))
}
fn report(&mut self,
sp: Span,
kind: ObsoleteSyntax,
kind_str: &str,
desc: &str) {
self.span_err(sp,
format!("obsolete syntax: {}", kind_str)[]);
if !self.obsolete_set.contains(&kind) {
self.sess
.span_diagnostic
.handler()
.note(format!("{}", desc)[]);
self.obsolete_set.insert(kind);
}
}
fn is_obsolete_ident(&mut self, ident: &str) -> bool {
match self.token {
token::Ident(sid, _) => {
token::get_ident(sid) == ident
}
_ => false
}
}
fn eat_obsolete_ident(&mut self, ident: &str) -> bool {
if self.is_obsolete_ident(ident) {
self.bump();
true
} else {
false
}
}
}