745 lines
23 KiB
Rust
745 lines
23 KiB
Rust
// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use ast;
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use codemap::{BytePos, Pos, span};
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use ext::base::ExtCtxt;
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use ext::base;
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use ext::build::AstBuilder;
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use parse::token::*;
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use parse::token;
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use parse;
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/**
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*
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* Quasiquoting works via token trees.
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*
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* This is registered as a set of expression syntax extension called quote!
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* that lifts its argument token-tree to an AST representing the
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* construction of the same token tree, with ast::tt_nonterminal nodes
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* interpreted as antiquotes (splices).
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*
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*/
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pub mod rt {
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use ast;
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use ext::base::ExtCtxt;
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use parse;
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use print::pprust;
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pub use ast::*;
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pub use parse::token::*;
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pub use parse::new_parser_from_tts;
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pub use codemap::{BytePos, span, dummy_spanned};
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pub trait ToTokens {
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pub fn to_tokens(&self, _cx: @ExtCtxt) -> ~[token_tree];
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}
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impl ToTokens for ~[token_tree] {
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pub fn to_tokens(&self, _cx: @ExtCtxt) -> ~[token_tree] {
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(*self).clone()
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}
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}
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/* Should be (when bugs in default methods are fixed):
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trait ToSource : ToTokens {
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// Takes a thing and generates a string containing rust code for it.
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pub fn to_source() -> ~str;
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// If you can make source, you can definitely make tokens.
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pub fn to_tokens(cx: @ExtCtxt) -> ~[token_tree] {
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cx.parse_tts(self.to_source())
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}
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}
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*/
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pub trait ToSource {
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// Takes a thing and generates a string containing rust code for it.
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pub fn to_source(&self) -> @str;
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}
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impl ToSource for ast::ident {
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fn to_source(&self) -> @str {
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ident_to_str(self)
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}
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}
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impl ToSource for @ast::item {
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fn to_source(&self) -> @str {
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pprust::item_to_str(*self, get_ident_interner()).to_managed()
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}
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}
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impl<'self> ToSource for &'self [@ast::item] {
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fn to_source(&self) -> @str {
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self.map(|i| i.to_source()).connect("\n\n").to_managed()
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}
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}
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impl ToSource for ast::Ty {
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fn to_source(&self) -> @str {
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pprust::ty_to_str(self, get_ident_interner()).to_managed()
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}
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}
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impl<'self> ToSource for &'self [ast::Ty] {
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fn to_source(&self) -> @str {
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self.map(|i| i.to_source()).connect(", ").to_managed()
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}
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}
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impl ToSource for Generics {
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fn to_source(&self) -> @str {
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pprust::generics_to_str(self, get_ident_interner()).to_managed()
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}
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}
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impl ToSource for @ast::expr {
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fn to_source(&self) -> @str {
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pprust::expr_to_str(*self, get_ident_interner()).to_managed()
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}
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}
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impl ToSource for ast::blk {
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fn to_source(&self) -> @str {
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pprust::block_to_str(self, get_ident_interner()).to_managed()
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}
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}
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impl<'self> ToSource for &'self str {
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fn to_source(&self) -> @str {
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let lit = dummy_spanned(ast::lit_str(self.to_managed()));
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pprust::lit_to_str(@lit).to_managed()
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}
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}
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impl ToSource for int {
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fn to_source(&self) -> @str {
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let lit = dummy_spanned(ast::lit_int(*self as i64, ast::ty_i));
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pprust::lit_to_str(@lit).to_managed()
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}
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}
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impl ToSource for i8 {
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fn to_source(&self) -> @str {
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let lit = dummy_spanned(ast::lit_int(*self as i64, ast::ty_i8));
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pprust::lit_to_str(@lit).to_managed()
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}
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}
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impl ToSource for i16 {
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fn to_source(&self) -> @str {
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let lit = dummy_spanned(ast::lit_int(*self as i64, ast::ty_i16));
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pprust::lit_to_str(@lit).to_managed()
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}
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}
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impl ToSource for i32 {
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fn to_source(&self) -> @str {
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let lit = dummy_spanned(ast::lit_int(*self as i64, ast::ty_i32));
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pprust::lit_to_str(@lit).to_managed()
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}
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}
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impl ToSource for i64 {
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fn to_source(&self) -> @str {
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let lit = dummy_spanned(ast::lit_int(*self as i64, ast::ty_i64));
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pprust::lit_to_str(@lit).to_managed()
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}
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}
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impl ToSource for uint {
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fn to_source(&self) -> @str {
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let lit = dummy_spanned(ast::lit_uint(*self as u64, ast::ty_u));
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pprust::lit_to_str(@lit).to_managed()
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}
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}
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impl ToSource for u8 {
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fn to_source(&self) -> @str {
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let lit = dummy_spanned(ast::lit_uint(*self as u64, ast::ty_u8));
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pprust::lit_to_str(@lit).to_managed()
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}
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}
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impl ToSource for u16 {
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fn to_source(&self) -> @str {
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let lit = dummy_spanned(ast::lit_uint(*self as u64, ast::ty_u16));
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pprust::lit_to_str(@lit).to_managed()
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}
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}
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impl ToSource for u32 {
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fn to_source(&self) -> @str {
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let lit = dummy_spanned(ast::lit_uint(*self as u64, ast::ty_u32));
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pprust::lit_to_str(@lit).to_managed()
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}
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}
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impl ToSource for u64 {
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fn to_source(&self) -> @str {
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let lit = dummy_spanned(ast::lit_uint(*self as u64, ast::ty_u64));
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pprust::lit_to_str(@lit).to_managed()
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}
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}
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// Alas ... we write these out instead. All redundant.
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impl ToTokens for ast::ident {
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fn to_tokens(&self, cx: @ExtCtxt) -> ~[token_tree] {
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cx.parse_tts(self.to_source())
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}
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}
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impl ToTokens for @ast::item {
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fn to_tokens(&self, cx: @ExtCtxt) -> ~[token_tree] {
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cx.parse_tts(self.to_source())
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}
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}
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impl<'self> ToTokens for &'self [@ast::item] {
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fn to_tokens(&self, cx: @ExtCtxt) -> ~[token_tree] {
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cx.parse_tts(self.to_source())
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}
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}
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impl ToTokens for ast::Ty {
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fn to_tokens(&self, cx: @ExtCtxt) -> ~[token_tree] {
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cx.parse_tts(self.to_source())
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}
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}
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impl<'self> ToTokens for &'self [ast::Ty] {
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fn to_tokens(&self, cx: @ExtCtxt) -> ~[token_tree] {
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cx.parse_tts(self.to_source())
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}
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}
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impl ToTokens for Generics {
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fn to_tokens(&self, cx: @ExtCtxt) -> ~[token_tree] {
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cx.parse_tts(self.to_source())
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}
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}
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impl ToTokens for @ast::expr {
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fn to_tokens(&self, cx: @ExtCtxt) -> ~[token_tree] {
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cx.parse_tts(self.to_source())
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}
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}
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impl ToTokens for ast::blk {
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fn to_tokens(&self, cx: @ExtCtxt) -> ~[token_tree] {
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cx.parse_tts(self.to_source())
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}
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}
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impl<'self> ToTokens for &'self str {
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fn to_tokens(&self, cx: @ExtCtxt) -> ~[token_tree] {
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cx.parse_tts(self.to_source())
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}
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}
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impl ToTokens for int {
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fn to_tokens(&self, cx: @ExtCtxt) -> ~[token_tree] {
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cx.parse_tts(self.to_source())
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}
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}
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impl ToTokens for i8 {
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fn to_tokens(&self, cx: @ExtCtxt) -> ~[token_tree] {
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cx.parse_tts(self.to_source())
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}
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}
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impl ToTokens for i16 {
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fn to_tokens(&self, cx: @ExtCtxt) -> ~[token_tree] {
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cx.parse_tts(self.to_source())
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}
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}
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impl ToTokens for i32 {
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fn to_tokens(&self, cx: @ExtCtxt) -> ~[token_tree] {
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cx.parse_tts(self.to_source())
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}
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}
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impl ToTokens for i64 {
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fn to_tokens(&self, cx: @ExtCtxt) -> ~[token_tree] {
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cx.parse_tts(self.to_source())
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}
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}
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impl ToTokens for uint {
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fn to_tokens(&self, cx: @ExtCtxt) -> ~[token_tree] {
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cx.parse_tts(self.to_source())
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}
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}
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impl ToTokens for u8 {
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fn to_tokens(&self, cx: @ExtCtxt) -> ~[token_tree] {
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cx.parse_tts(self.to_source())
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}
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}
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impl ToTokens for u16 {
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fn to_tokens(&self, cx: @ExtCtxt) -> ~[token_tree] {
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cx.parse_tts(self.to_source())
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}
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}
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impl ToTokens for u32 {
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fn to_tokens(&self, cx: @ExtCtxt) -> ~[token_tree] {
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cx.parse_tts(self.to_source())
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}
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}
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impl ToTokens for u64 {
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fn to_tokens(&self, cx: @ExtCtxt) -> ~[token_tree] {
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cx.parse_tts(self.to_source())
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}
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}
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pub trait ExtParseUtils {
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fn parse_item(&self, s: @str) -> @ast::item;
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fn parse_expr(&self, s: @str) -> @ast::expr;
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fn parse_stmt(&self, s: @str) -> @ast::stmt;
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fn parse_tts(&self, s: @str) -> ~[ast::token_tree];
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}
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impl ExtParseUtils for ExtCtxt {
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fn parse_item(&self, s: @str) -> @ast::item {
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let res = parse::parse_item_from_source_str(
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@"<quote expansion>",
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s,
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self.cfg(),
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~[],
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self.parse_sess());
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match res {
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Some(ast) => ast,
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None => {
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error!("Parse error with ```\n%s\n```", s);
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fail!()
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}
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}
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}
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fn parse_stmt(&self, s: @str) -> @ast::stmt {
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parse::parse_stmt_from_source_str(
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@"<quote expansion>",
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s,
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self.cfg(),
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~[],
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self.parse_sess())
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}
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fn parse_expr(&self, s: @str) -> @ast::expr {
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parse::parse_expr_from_source_str(
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@"<quote expansion>",
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s,
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self.cfg(),
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self.parse_sess())
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}
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fn parse_tts(&self, s: @str) -> ~[ast::token_tree] {
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parse::parse_tts_from_source_str(
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@"<quote expansion>",
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s,
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self.cfg(),
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self.parse_sess())
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}
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}
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}
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pub fn expand_quote_tokens(cx: @ExtCtxt,
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sp: span,
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tts: &[ast::token_tree]) -> base::MacResult {
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base::MRExpr(expand_tts(cx, sp, tts))
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}
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pub fn expand_quote_expr(cx: @ExtCtxt,
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sp: span,
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tts: &[ast::token_tree]) -> base::MacResult {
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base::MRExpr(expand_parse_call(cx, sp, "parse_expr", ~[], tts))
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}
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pub fn expand_quote_item(cx: @ExtCtxt,
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sp: span,
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tts: &[ast::token_tree]) -> base::MacResult {
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let e_attrs = cx.expr_vec_uniq(sp, ~[]);
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base::MRExpr(expand_parse_call(cx, sp, "parse_item",
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~[e_attrs], tts))
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}
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pub fn expand_quote_pat(cx: @ExtCtxt,
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sp: span,
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tts: &[ast::token_tree]) -> base::MacResult {
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let e_refutable = cx.expr_lit(sp, ast::lit_bool(true));
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base::MRExpr(expand_parse_call(cx, sp, "parse_pat",
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~[e_refutable], tts))
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}
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pub fn expand_quote_ty(cx: @ExtCtxt,
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sp: span,
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tts: &[ast::token_tree]) -> base::MacResult {
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let e_param_colons = cx.expr_lit(sp, ast::lit_bool(false));
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base::MRExpr(expand_parse_call(cx, sp, "parse_ty",
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~[e_param_colons], tts))
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}
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pub fn expand_quote_stmt(cx: @ExtCtxt,
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sp: span,
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tts: &[ast::token_tree]) -> base::MacResult {
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let e_attrs = cx.expr_vec_uniq(sp, ~[]);
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base::MRExpr(expand_parse_call(cx, sp, "parse_stmt",
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~[e_attrs], tts))
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}
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fn ids_ext(strs: ~[~str]) -> ~[ast::ident] {
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strs.map(|str| str_to_ident(*str))
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}
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fn id_ext(str: &str) -> ast::ident {
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str_to_ident(str)
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}
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// Lift an ident to the expr that evaluates to that ident.
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fn mk_ident(cx: @ExtCtxt, sp: span, ident: ast::ident) -> @ast::expr {
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let e_str = cx.expr_str(sp, cx.str_of(ident));
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cx.expr_method_call(sp,
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cx.expr_ident(sp, id_ext("ext_cx")),
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id_ext("ident_of"),
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~[e_str])
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}
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fn mk_bytepos(cx: @ExtCtxt, sp: span, bpos: BytePos) -> @ast::expr {
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let path = id_ext("BytePos");
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let arg = cx.expr_uint(sp, bpos.to_uint());
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cx.expr_call_ident(sp, path, ~[arg])
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}
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fn mk_binop(cx: @ExtCtxt, sp: span, bop: token::binop) -> @ast::expr {
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let name = match bop {
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PLUS => "PLUS",
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MINUS => "MINUS",
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STAR => "STAR",
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SLASH => "SLASH",
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PERCENT => "PERCENT",
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CARET => "CARET",
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AND => "AND",
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OR => "OR",
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SHL => "SHL",
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SHR => "SHR"
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};
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cx.expr_ident(sp, id_ext(name))
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}
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fn mk_token(cx: @ExtCtxt, sp: span, tok: &token::Token) -> @ast::expr {
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match *tok {
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BINOP(binop) => {
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return cx.expr_call_ident(sp,
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id_ext("BINOP"),
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~[mk_binop(cx, sp, binop)]);
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}
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BINOPEQ(binop) => {
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return cx.expr_call_ident(sp,
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id_ext("BINOPEQ"),
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~[mk_binop(cx, sp, binop)]);
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}
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LIT_INT(i, ity) => {
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let s_ity = match ity {
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ast::ty_i => ~"ty_i",
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ast::ty_char => ~"ty_char",
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ast::ty_i8 => ~"ty_i8",
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ast::ty_i16 => ~"ty_i16",
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ast::ty_i32 => ~"ty_i32",
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ast::ty_i64 => ~"ty_i64"
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};
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let e_ity = cx.expr_ident(sp, id_ext(s_ity));
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let e_i64 = cx.expr_lit(sp, ast::lit_int(i, ast::ty_i64));
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return cx.expr_call_ident(sp,
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id_ext("LIT_INT"),
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~[e_i64, e_ity]);
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}
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LIT_UINT(u, uty) => {
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let s_uty = match uty {
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ast::ty_u => ~"ty_u",
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ast::ty_u8 => ~"ty_u8",
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ast::ty_u16 => ~"ty_u16",
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ast::ty_u32 => ~"ty_u32",
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ast::ty_u64 => ~"ty_u64"
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};
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let e_uty = cx.expr_ident(sp, id_ext(s_uty));
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let e_u64 = cx.expr_lit(sp, ast::lit_uint(u, ast::ty_u64));
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return cx.expr_call_ident(sp,
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id_ext("LIT_UINT"),
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~[e_u64, e_uty]);
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}
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LIT_INT_UNSUFFIXED(i) => {
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let e_i64 = cx.expr_lit(sp, ast::lit_int(i, ast::ty_i64));
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return cx.expr_call_ident(sp,
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id_ext("LIT_INT_UNSUFFIXED"),
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~[e_i64]);
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}
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LIT_FLOAT(fident, fty) => {
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let s_fty = match fty {
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ast::ty_f => ~"ty_f",
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ast::ty_f32 => ~"ty_f32",
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ast::ty_f64 => ~"ty_f64"
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};
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let e_fty = cx.expr_ident(sp, id_ext(s_fty));
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|
|
let e_fident = mk_ident(cx, sp, fident);
|
|
|
|
return cx.expr_call_ident(sp,
|
|
id_ext("LIT_FLOAT"),
|
|
~[e_fident, e_fty]);
|
|
}
|
|
|
|
LIT_STR(ident) => {
|
|
return cx.expr_call_ident(sp,
|
|
id_ext("LIT_STR"),
|
|
~[mk_ident(cx, sp, ident)]);
|
|
}
|
|
|
|
IDENT(ident, b) => {
|
|
return cx.expr_call_ident(sp,
|
|
id_ext("IDENT"),
|
|
~[mk_ident(cx, sp, ident),
|
|
cx.expr_bool(sp, b)]);
|
|
}
|
|
|
|
LIFETIME(ident) => {
|
|
return cx.expr_call_ident(sp,
|
|
id_ext("LIFETIME"),
|
|
~[mk_ident(cx, sp, ident)]);
|
|
}
|
|
|
|
DOC_COMMENT(ident) => {
|
|
return cx.expr_call_ident(sp,
|
|
id_ext("DOC_COMMENT"),
|
|
~[mk_ident(cx, sp, ident)]);
|
|
}
|
|
|
|
INTERPOLATED(_) => fail!("quote! with interpolated token"),
|
|
|
|
_ => ()
|
|
}
|
|
|
|
let name = match *tok {
|
|
EQ => "EQ",
|
|
LT => "LT",
|
|
LE => "LE",
|
|
EQEQ => "EQEQ",
|
|
NE => "NE",
|
|
GE => "GE",
|
|
GT => "GT",
|
|
ANDAND => "ANDAND",
|
|
OROR => "OROR",
|
|
NOT => "NOT",
|
|
TILDE => "TILDE",
|
|
AT => "AT",
|
|
DOT => "DOT",
|
|
DOTDOT => "DOTDOT",
|
|
COMMA => "COMMA",
|
|
SEMI => "SEMI",
|
|
COLON => "COLON",
|
|
MOD_SEP => "MOD_SEP",
|
|
RARROW => "RARROW",
|
|
LARROW => "LARROW",
|
|
DARROW => "DARROW",
|
|
FAT_ARROW => "FAT_ARROW",
|
|
LPAREN => "LPAREN",
|
|
RPAREN => "RPAREN",
|
|
LBRACKET => "LBRACKET",
|
|
RBRACKET => "RBRACKET",
|
|
LBRACE => "LBRACE",
|
|
RBRACE => "RBRACE",
|
|
POUND => "POUND",
|
|
DOLLAR => "DOLLAR",
|
|
UNDERSCORE => "UNDERSCORE",
|
|
EOF => "EOF",
|
|
_ => fail!()
|
|
};
|
|
cx.expr_ident(sp, id_ext(name))
|
|
}
|
|
|
|
|
|
fn mk_tt(cx: @ExtCtxt, sp: span, tt: &ast::token_tree)
|
|
-> ~[@ast::stmt] {
|
|
|
|
match *tt {
|
|
|
|
ast::tt_tok(sp, ref tok) => {
|
|
let e_sp = cx.expr_ident(sp, id_ext("sp"));
|
|
let e_tok = cx.expr_call_ident(sp,
|
|
id_ext("tt_tok"),
|
|
~[e_sp, mk_token(cx, sp, tok)]);
|
|
let e_push =
|
|
cx.expr_method_call(sp,
|
|
cx.expr_ident(sp, id_ext("tt")),
|
|
id_ext("push"),
|
|
~[e_tok]);
|
|
~[cx.stmt_expr(e_push)]
|
|
}
|
|
|
|
ast::tt_delim(ref tts) => mk_tts(cx, sp, **tts),
|
|
ast::tt_seq(*) => fail!("tt_seq in quote!"),
|
|
|
|
ast::tt_nonterminal(sp, ident) => {
|
|
|
|
// tt.push_all_move($ident.to_tokens(ext_cx))
|
|
|
|
let e_to_toks =
|
|
cx.expr_method_call(sp,
|
|
cx.expr_ident(sp, ident),
|
|
id_ext("to_tokens"),
|
|
~[cx.expr_ident(sp, id_ext("ext_cx"))]);
|
|
|
|
let e_push =
|
|
cx.expr_method_call(sp,
|
|
cx.expr_ident(sp, id_ext("tt")),
|
|
id_ext("push_all_move"),
|
|
~[e_to_toks]);
|
|
|
|
~[cx.stmt_expr(e_push)]
|
|
}
|
|
}
|
|
}
|
|
|
|
fn mk_tts(cx: @ExtCtxt, sp: span, tts: &[ast::token_tree])
|
|
-> ~[@ast::stmt] {
|
|
let mut ss = ~[];
|
|
for tts.iter().advance |tt| {
|
|
ss.push_all_move(mk_tt(cx, sp, tt));
|
|
}
|
|
ss
|
|
}
|
|
|
|
fn expand_tts(cx: @ExtCtxt,
|
|
sp: span,
|
|
tts: &[ast::token_tree]) -> @ast::expr {
|
|
|
|
// NB: It appears that the main parser loses its mind if we consider
|
|
// $foo as a tt_nonterminal during the main parse, so we have to re-parse
|
|
// under quote_depth > 0. This is silly and should go away; the _guess_ is
|
|
// it has to do with transition away from supporting old-style macros, so
|
|
// try removing it when enough of them are gone.
|
|
|
|
let p = parse::new_parser_from_tts(
|
|
cx.parse_sess(),
|
|
cx.cfg(),
|
|
tts.to_owned()
|
|
);
|
|
*p.quote_depth += 1u;
|
|
let tts = p.parse_all_token_trees();
|
|
p.abort_if_errors();
|
|
|
|
// We want to emit a block expression that does a sequence of 'use's to
|
|
// import the runtime module, followed by a tt-building expression.
|
|
|
|
let uses = ~[ cx.view_use_glob(sp, ast::public,
|
|
ids_ext(~[~"syntax",
|
|
~"ext",
|
|
~"quote",
|
|
~"rt"])) ];
|
|
|
|
// We also bind a single value, sp, to ext_cx.call_site()
|
|
//
|
|
// This causes every span in a token-tree quote to be attributed to the
|
|
// call site of the extension using the quote. We can't really do much
|
|
// better since the source of the quote may well be in a library that
|
|
// was not even parsed by this compilation run, that the user has no
|
|
// source code for (eg. in libsyntax, which they're just _using_).
|
|
//
|
|
// The old quasiquoter had an elaborate mechanism for denoting input
|
|
// file locations from which quotes originated; unfortunately this
|
|
// relied on feeding the source string of the quote back into the
|
|
// compiler (which we don't really want to do) and, in any case, only
|
|
// pushed the problem a very small step further back: an error
|
|
// resulting from a parse of the resulting quote is still attributed to
|
|
// the site the string literal occurred, which was in a source file
|
|
// _other_ than the one the user has control over. For example, an
|
|
// error in a quote from the protocol compiler, invoked in user code
|
|
// using proto! for example, will be attributed to the pipec.rs file in
|
|
// libsyntax, which the user might not even have source to (unless they
|
|
// happen to have a compiler on hand). Over all, the phase distinction
|
|
// just makes quotes "hard to attribute". Possibly this could be fixed
|
|
// by recreating some of the original qq machinery in the tt regime
|
|
// (pushing fake FileMaps onto the parser to account for original sites
|
|
// of quotes, for example) but at this point it seems not likely to be
|
|
// worth the hassle.
|
|
|
|
let e_sp = cx.expr_method_call(sp,
|
|
cx.expr_ident(sp, id_ext("ext_cx")),
|
|
id_ext("call_site"),
|
|
~[]);
|
|
|
|
let stmt_let_sp = cx.stmt_let(sp, false,
|
|
id_ext("sp"),
|
|
e_sp);
|
|
|
|
let stmt_let_tt = cx.stmt_let(sp, true,
|
|
id_ext("tt"),
|
|
cx.expr_vec_uniq(sp, ~[]));
|
|
|
|
cx.expr_blk(
|
|
cx.blk_all(sp, uses,
|
|
~[stmt_let_sp,
|
|
stmt_let_tt] + mk_tts(cx, sp, tts),
|
|
Some(cx.expr_ident(sp, id_ext("tt")))))
|
|
}
|
|
|
|
fn expand_parse_call(cx: @ExtCtxt,
|
|
sp: span,
|
|
parse_method: &str,
|
|
arg_exprs: ~[@ast::expr],
|
|
tts: &[ast::token_tree]) -> @ast::expr {
|
|
let tts_expr = expand_tts(cx, sp, tts);
|
|
|
|
let cfg_call = || cx.expr_method_call(
|
|
sp, cx.expr_ident(sp, id_ext("ext_cx")),
|
|
id_ext("cfg"), ~[]);
|
|
|
|
let parse_sess_call = || cx.expr_method_call(
|
|
sp, cx.expr_ident(sp, id_ext("ext_cx")),
|
|
id_ext("parse_sess"), ~[]);
|
|
|
|
let new_parser_call =
|
|
cx.expr_call_global(sp,
|
|
ids_ext(~[~"syntax",
|
|
~"ext",
|
|
~"quote",
|
|
~"rt",
|
|
~"new_parser_from_tts"]),
|
|
~[parse_sess_call(),
|
|
cfg_call(),
|
|
tts_expr]);
|
|
|
|
cx.expr_method_call(sp, new_parser_call,
|
|
id_ext(parse_method),
|
|
arg_exprs)
|
|
}
|