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Use macros to implement syntax::ext::quote::ToSource 

This code deserves a bigger refactor, but here's a local improvement.
This commit is contained in:
Keegan McAllister 2014-06-20 18:14:47 -07:00 committed by Alex Crichton
parent a0ec902e23
commit 4e26e2d8ca
1 changed files with 76 additions and 127 deletions
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203
src/libsyntax/ext/quote.rs
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@ -68,72 +68,61 @@ pub mod rt {
*/
// FIXME: Move this trait to pprust and get rid of *_to_str?
pub trait ToSource {
// Takes a thing and generates a string containing rust code for it.
fn to_source(&self) -> String;
}
macro_rules! impl_to_source(
(Gc<$t:ty>, $pp:ident) => (
impl ToSource for Gc<$t> {
fn to_source(&self) -> String {
pprust::$pp(&**self)
}
}
);
($t:ty, $pp:ident) => (
impl ToSource for $t {
fn to_source(&self) -> String {
pprust::$pp(self)
}
}
);
)
fn slice_to_source<'a, T: ToSource>(sep: &'static str, xs: &'a [T]) -> String {
xs.iter()
.map(|i| i.to_source())
.collect::<Vec<String>>()
.connect(sep)
.to_string()
}
macro_rules! impl_to_source_slice(
($t:ty, $sep:expr) => (
impl<'a> ToSource for &'a [$t] {
fn to_source(&self) -> String {
slice_to_source($sep, *self)
}
}
)
)
impl ToSource for ast::Ident {
fn to_source(&self) -> String {
token::get_ident(*self).get().to_string()
}
}
impl ToSource for Gc<ast::Item> {
fn to_source(&self) -> String {
pprust::item_to_str(&**self)
}
}
impl<'a> ToSource for &'a [Gc<ast::Item>] {
fn to_source(&self) -> String {
self.iter()
.map(|i| i.to_source())
.collect::<Vec<String>>()
.connect("\n\n")
.to_string()
}
}
impl ToSource for ast::Ty {
fn to_source(&self) -> String {
pprust::ty_to_str(self)
}
}
impl<'a> ToSource for &'a [ast::Ty] {
fn to_source(&self) -> String {
self.iter()
.map(|i| i.to_source())
.collect::<Vec<String>>()
.connect(", ")
.to_string()
}
}
impl ToSource for Generics {
fn to_source(&self) -> String {
pprust::generics_to_str(self)
}
}
impl ToSource for Gc<ast::Expr> {
fn to_source(&self) -> String {
pprust::expr_to_str(&**self)
}
}
impl ToSource for ast::Block {
fn to_source(&self) -> String {
pprust::block_to_str(self)
}
}
impl ToSource for ast::Arg {
fn to_source(&self) -> String {
pprust::arg_to_str(self)
}
}
impl_to_source!(ast::Ty, ty_to_str)
impl_to_source!(ast::Block, block_to_str)
impl_to_source!(ast::Arg, arg_to_str)
impl_to_source!(Generics, generics_to_str)
impl_to_source!(Gc<ast::Item>, item_to_str)
impl_to_source!(Gc<ast::Expr>, expr_to_str)
impl_to_source_slice!(ast::Ty, ", ")
impl_to_source_slice!(Gc<ast::Item>, "\n\n")
impl<'a> ToSource for &'a str {
fn to_source(&self) -> String {
@ -163,76 +152,36 @@ pub mod rt {
}
}
impl ToSource for int {
fn to_source(&self) -> String {
let lit = dummy_spanned(ast::LitInt(*self as i64, ast::TyI));
pprust::lit_to_str(&lit)
}
}
macro_rules! impl_to_source_int(
(signed, $t:ty, $tag:ident) => (
impl ToSource for $t {
fn to_source(&self) -> String {
let lit = dummy_spanned(ast::LitInt(*self as i64, ast::$tag));
pprust::lit_to_str(&lit)
}
}
);
(unsigned, $t:ty, $tag:ident) => (
impl ToSource for $t {
fn to_source(&self) -> String {
let lit = dummy_spanned(ast::LitUint(*self as u64, ast::$tag));
pprust::lit_to_str(&lit)
}
}
);
)
impl ToSource for i8 {
fn to_source(&self) -> String {
let lit = dummy_spanned(ast::LitInt(*self as i64, ast::TyI8));
pprust::lit_to_str(&lit)
}
}
impl_to_source_int!(signed, int, TyI)
impl_to_source_int!(signed, i8, TyI8)
impl_to_source_int!(signed, i16, TyI16)
impl_to_source_int!(signed, i32, TyI32)
impl_to_source_int!(signed, i64, TyI64)
impl ToSource for i16 {
fn to_source(&self) -> String {
let lit = dummy_spanned(ast::LitInt(*self as i64, ast::TyI16));
pprust::lit_to_str(&lit)
}
}
impl ToSource for i32 {
fn to_source(&self) -> String {
let lit = dummy_spanned(ast::LitInt(*self as i64, ast::TyI32));
pprust::lit_to_str(&lit)
}
}
impl ToSource for i64 {
fn to_source(&self) -> String {
let lit = dummy_spanned(ast::LitInt(*self as i64, ast::TyI64));
pprust::lit_to_str(&lit)
}
}
impl ToSource for uint {
fn to_source(&self) -> String {
let lit = dummy_spanned(ast::LitUint(*self as u64, ast::TyU));
pprust::lit_to_str(&lit)
}
}
impl ToSource for u8 {
fn to_source(&self) -> String {
let lit = dummy_spanned(ast::LitUint(*self as u64, ast::TyU8));
pprust::lit_to_str(&lit)
}
}
impl ToSource for u16 {
fn to_source(&self) -> String {
let lit = dummy_spanned(ast::LitUint(*self as u64, ast::TyU16));
pprust::lit_to_str(&lit)
}
}
impl ToSource for u32 {
fn to_source(&self) -> String {
let lit = dummy_spanned(ast::LitUint(*self as u64, ast::TyU32));
pprust::lit_to_str(&lit)
}
}
impl ToSource for u64 {
fn to_source(&self) -> String {
let lit = dummy_spanned(ast::LitUint(*self as u64, ast::TyU64));
pprust::lit_to_str(&lit)
}
}
impl_to_source_int!(unsigned, uint, TyU)
impl_to_source_int!(unsigned, u8, TyU8)
impl_to_source_int!(unsigned, u16, TyU16)
impl_to_source_int!(unsigned, u32, TyU32)
impl_to_source_int!(unsigned, u64, TyU64)
// Alas ... we write these out instead. All redundant.
@ -246,7 +195,7 @@ pub mod rt {
)
)
macro_rules! impl_to_tokens_self(
macro_rules! impl_to_tokens_lifetime(
($t:ty) => (
impl<'a> ToTokens for $t {
fn to_tokens(&self, cx: &ExtCtxt) -> Vec<TokenTree> {
@ -258,14 +207,14 @@ pub mod rt {
impl_to_tokens!(ast::Ident)
impl_to_tokens!(Gc<ast::Item>)
impl_to_tokens_self!(&'a [Gc<ast::Item>])
impl_to_tokens_lifetime!(&'a [Gc<ast::Item>])
impl_to_tokens!(ast::Ty)
impl_to_tokens_self!(&'a [ast::Ty])
impl_to_tokens_lifetime!(&'a [ast::Ty])
impl_to_tokens!(Generics)
impl_to_tokens!(Gc<ast::Expr>)
impl_to_tokens!(ast::Block)
impl_to_tokens!(ast::Arg)
impl_to_tokens_self!(&'a str)
impl_to_tokens_lifetime!(&'a str)
impl_to_tokens!(())
impl_to_tokens!(char)
impl_to_tokens!(bool)