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use ast;
use codemap::Span;
use ext::base::*;
use ext::base;
use ext::build::AstBuilder;
use std::ascii::AsciiExt;
pub fn expand_syntax_ext<'cx>(cx: &'cx mut ExtCtxt,
sp: Span,
tts: &[ast::TokenTree])
-> Box<base::MacResult+'cx> {
cx.span_warn(sp, "`bytes!` is deprecated, use `b\"foo\"` literals instead");
cx.parse_sess.span_diagnostic.span_help(sp,
"see http://doc.rust-lang.org/reference.html#byte-and-byte-string-literals \
for documentation");
cx.parse_sess.span_diagnostic.span_help(sp,
"see https://github.com/rust-lang/rust/blob/master/src/etc/2014-06-rewrite-bytes-macros.py \
for an automated migration");
let exprs = match get_exprs_from_tts(cx, sp, tts) {
None => return DummyResult::expr(sp),
Some(e) => e,
};
let mut bytes = Vec::new();
let mut err = false;
for expr in exprs.iter() {
match expr.node {
ast::ExprLit(ref lit) => match lit.node {
ast::LitStr(ref s, _) => {
for byte in s.get().bytes() {
bytes.push(cx.expr_u8(expr.span, byte));
}
}
ast::LitInt(v, ast::UnsignedIntLit(ast::TyU8)) => {
if v > 0xFF {
cx.span_err(expr.span, "too large u8 literal in bytes!");
err = true;
} else {
bytes.push(cx.expr_u8(expr.span, v as u8));
}
}
ast::LitInt(_, ast::UnsuffixedIntLit(ast::Minus)) => {
cx.span_err(expr.span, "negative integer literal in bytes!");
err = true;
}
ast::LitInt(v, ast::UnsuffixedIntLit(ast::Plus)) => {
if v > 0xFF {
cx.span_err(expr.span, "too large integer literal in bytes!");
err = true;
} else {
bytes.push(cx.expr_u8(expr.span, v as u8));
}
}
ast::LitChar(v) => {
if v.is_ascii() {
bytes.push(cx.expr_u8(expr.span, v as u8));
} else {
cx.span_err(expr.span, "non-ascii char literal in bytes!");
err = true;
}
}
_ => {
cx.span_err(expr.span, "unsupported literal in bytes!");
err = true;
}
},
_ => {
cx.span_err(expr.span, "non-literal in bytes!");
err = true;
}
}
}
if err {
return DummyResult::expr(sp);
}
let len = bytes.len();
let e = cx.expr_vec(sp, bytes);
let ty = cx.ty(sp, ast::TyFixedLengthVec(cx.ty_ident(sp, cx.ident_of("u8")),
cx.expr_uint(sp, len)));
let item = cx.item_static(sp, cx.ident_of("BYTES"), ty, ast::MutImmutable, e);
let ret = cx.expr_ident(sp, cx.ident_of("BYTES"));
let ret = cx.expr_addr_of(sp, ret);
let e = cx.expr_block(cx.block(sp, vec![cx.stmt_item(sp, item)],
Some(ret)));
MacExpr::new(e)
}