74 lines
2.6 KiB
Rust
74 lines
2.6 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: @ExtCtxt, sp: span, tts: &[ast::token_tree]) -> base::MacResult {
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// Gather all argument expressions
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let exprs = get_exprs_from_tts(cx, tts);
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let mut bytes = ~[];
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for exprs.each |expr| {
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match expr.node {
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// expression is a literal
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ast::expr_lit(lit) => match lit.node {
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// string literal, push each byte to vector expression
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ast::lit_str(s) => {
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for s.each |byte| {
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bytes.push(cx.expr_u8(sp, byte));
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}
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}
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// u8 literal, push to vector expression
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ast::lit_uint(v, ast::ty_u8) => {
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if v > 0xFF {
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cx.span_err(sp, "Too large u8 literal in bytes!")
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} else {
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bytes.push(cx.expr_u8(sp, 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::lit_int_unsuffixed(v) => {
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if v > 0xFF {
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cx.span_err(sp, "Too large integer literal in bytes!")
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} else if v < 0 {
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cx.span_err(sp, "Negative integer literal in bytes!")
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} else {
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bytes.push(cx.expr_u8(sp, 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::lit_int(v, ast::ty_char) => {
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if (v as char).is_ascii() {
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bytes.push(cx.expr_u8(sp, v as u8));
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} else {
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cx.span_err(sp, "Non-ascii char literal in bytes!")
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}
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}
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_ => cx.span_err(sp, "Unsupported literal in bytes!")
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},
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_ => cx.span_err(sp, "Non-literal in bytes!")
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}
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}
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let e = cx.expr_vec_slice(sp, bytes);
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MRExpr(e)
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}
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