118 lines
4.5 KiB
Rust
118 lines
4.5 KiB
Rust
// Copyright 2013 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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/* The compiler code necessary to support the bytes! extension. */
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use ast;
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use codemap::Span;
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use ext::base::*;
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use ext::base;
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use ext::build::AstBuilder;
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pub fn expand_syntax_ext<'cx>(cx: &'cx mut ExtCtxt,
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sp: Span,
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tts: &[ast::TokenTree])
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-> Box<base::MacResult+'cx> {
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cx.span_warn(sp, "`bytes!` is deprecated, use `b\"foo\"` literals instead");
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cx.parse_sess.span_diagnostic.span_help(sp,
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"see http://doc.rust-lang.org/reference.html#byte-and-byte-string-literals \
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for documentation");
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cx.parse_sess.span_diagnostic.span_help(sp,
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"see https://github.com/rust-lang/rust/blob/master/src/etc/2014-06-rewrite-bytes-macros.py \
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for an automated migration");
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// Gather all argument expressions
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let exprs = match get_exprs_from_tts(cx, sp, tts) {
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None => return DummyResult::expr(sp),
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Some(e) => e,
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};
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let mut bytes = Vec::new();
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let mut err = false;
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for expr in exprs.iter() {
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match expr.node {
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// expression is a literal
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ast::ExprLit(ref lit) => match lit.node {
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// string literal, push each byte to vector expression
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ast::LitStr(ref s, _) => {
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for byte in s.get().bytes() {
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bytes.push(cx.expr_u8(expr.span, byte));
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}
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}
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// u8 literal, push to vector expression
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ast::LitInt(v, ast::UnsignedIntLit(ast::TyU8)) => {
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if v > 0xFF {
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cx.span_err(expr.span, "too large u8 literal in bytes!");
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err = true;
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} else {
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bytes.push(cx.expr_u8(expr.span, v as u8));
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}
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}
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// integer literal, push to vector expression
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ast::LitInt(_, ast::UnsuffixedIntLit(ast::Minus)) => {
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cx.span_err(expr.span, "negative integer literal in bytes!");
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err = true;
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}
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ast::LitInt(v, ast::UnsuffixedIntLit(ast::Plus)) => {
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if v > 0xFF {
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cx.span_err(expr.span, "too large integer literal in bytes!");
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err = true;
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} else {
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bytes.push(cx.expr_u8(expr.span, v as u8));
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}
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}
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// char literal, push to vector expression
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ast::LitChar(v) => {
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if v.is_ascii() {
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bytes.push(cx.expr_u8(expr.span, v as u8));
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} else {
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cx.span_err(expr.span, "non-ascii char literal in bytes!");
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err = true;
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}
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}
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_ => {
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cx.span_err(expr.span, "unsupported literal in bytes!");
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err = true;
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}
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},
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_ => {
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cx.span_err(expr.span, "non-literal in bytes!");
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err = true;
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}
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}
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}
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// For some reason using quote_expr!() here aborts if we threw an error.
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// I'm assuming that the end of the recursive parse tricks the compiler
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// into thinking this is a good time to stop. But we'd rather keep going.
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if err {
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// Since the compiler will stop after the macro expansion phase anyway, we
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// don't need type info, so we can just return a DummyResult
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return DummyResult::expr(sp);
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}
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let len = bytes.len();
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let e = cx.expr_vec(sp, bytes);
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let ty = cx.ty(sp, ast::TyFixedLengthVec(cx.ty_ident(sp, cx.ident_of("u8")),
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cx.expr_uint(sp, len)));
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let item = cx.item_static(sp, cx.ident_of("BYTES"), ty, ast::MutImmutable, e);
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let ret = cx.expr_ident(sp, cx.ident_of("BYTES"));
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let ret = cx.expr_addr_of(sp, ret);
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let e = cx.expr_block(cx.block(sp, vec![cx.stmt_item(sp, item)],
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Some(ret)));
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MacExpr::new(e)
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}
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