80 lines
2.8 KiB
Rust
80 lines
2.8 KiB
Rust
// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
|
|
// file at the top-level directory of this distribution and at
|
|
// http://rust-lang.org/COPYRIGHT.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
|
|
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
|
|
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
|
|
// option. This file may not be copied, modified, or distributed
|
|
// except according to those terms.
|
|
|
|
/* The compiler code necessary to support the bytes! extension. */
|
|
|
|
use ast;
|
|
use codemap::Span;
|
|
use ext::base::*;
|
|
use ext::base;
|
|
use ext::build::AstBuilder;
|
|
|
|
use std::char;
|
|
use std::vec_ng::Vec;
|
|
|
|
pub fn expand_syntax_ext(cx: &mut ExtCtxt, sp: Span, tts: &[ast::TokenTree]) -> base::MacResult {
|
|
// Gather all argument expressions
|
|
let exprs = match get_exprs_from_tts(cx, sp, tts) {
|
|
None => return MacResult::dummy_expr(sp),
|
|
Some(e) => e,
|
|
};
|
|
let mut bytes = Vec::new();
|
|
|
|
for expr in exprs.iter() {
|
|
match expr.node {
|
|
// expression is a literal
|
|
ast::ExprLit(lit) => match lit.node {
|
|
// string literal, push each byte to vector expression
|
|
ast::LitStr(ref s, _) => {
|
|
for byte in s.get().bytes() {
|
|
bytes.push(cx.expr_u8(expr.span, byte));
|
|
}
|
|
}
|
|
|
|
// u8 literal, push to vector expression
|
|
ast::LitUint(v, ast::TyU8) => {
|
|
if v > 0xFF {
|
|
cx.span_err(expr.span, "too large u8 literal in bytes!")
|
|
} else {
|
|
bytes.push(cx.expr_u8(expr.span, v as u8));
|
|
}
|
|
}
|
|
|
|
// integer literal, push to vector expression
|
|
ast::LitIntUnsuffixed(v) => {
|
|
if v > 0xFF {
|
|
cx.span_err(expr.span, "too large integer literal in bytes!")
|
|
} else if v < 0 {
|
|
cx.span_err(expr.span, "negative integer literal in bytes!")
|
|
} else {
|
|
bytes.push(cx.expr_u8(expr.span, v as u8));
|
|
}
|
|
}
|
|
|
|
// char literal, push to vector expression
|
|
ast::LitChar(v) => {
|
|
if char::from_u32(v).unwrap().is_ascii() {
|
|
bytes.push(cx.expr_u8(expr.span, v as u8));
|
|
} else {
|
|
cx.span_err(expr.span, "non-ascii char literal in bytes!")
|
|
}
|
|
}
|
|
|
|
_ => cx.span_err(expr.span, "unsupported literal in bytes!")
|
|
},
|
|
|
|
_ => cx.span_err(expr.span, "non-literal in bytes!")
|
|
}
|
|
}
|
|
|
|
let e = cx.expr_vec_slice(sp, bytes);
|
|
MRExpr(e)
|
|
}
|