1 // Copyright 2012-2013 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
12 * The compiler code necessary to support the env! extension. Eventually this
13 * should all get sucked into either the compiler syntax extension plugin
21 use ext::build::AstBuilder;
26 pub fn expand_option_env<'cx>(cx: &'cx mut ExtCtxt, sp: Span, tts: &[ast::TokenTree])
27 -> Box<base::MacResult+'cx> {
28 let var = match get_single_str_from_tts(cx, sp, tts, "option_env!") {
29 None => return DummyResult::expr(sp),
33 let e = match os::getenv(var.as_slice()) {
35 cx.expr_path(cx.path_all(sp,
37 vec!(cx.ident_of("std"),
38 cx.ident_of("option"),
50 cx.expr_call_global(sp,
51 vec!(cx.ident_of("std"),
52 cx.ident_of("option"),
55 token::intern_and_get_ident(
62 pub fn expand_env<'cx>(cx: &'cx mut ExtCtxt, sp: Span, tts: &[ast::TokenTree])
63 -> Box<base::MacResult+'cx> {
64 let exprs = match get_exprs_from_tts(cx, sp, tts) {
65 Some(ref exprs) if exprs.len() == 0 => {
66 cx.span_err(sp, "env! takes 1 or 2 arguments");
67 return DummyResult::expr(sp);
69 None => return DummyResult::expr(sp),
73 let var = match expr_to_string(cx,
75 "expected string literal") {
76 None => return DummyResult::expr(sp),
77 Some((v, _style)) => v
79 let msg = match exprs.len() {
81 token::intern_and_get_ident(format!("environment variable `{}` \
86 match expr_to_string(cx, *exprs.get(1), "expected string literal") {
87 None => return DummyResult::expr(sp),
88 Some((s, _style)) => s
92 cx.span_err(sp, "env! takes 1 or 2 arguments");
93 return DummyResult::expr(sp);
97 let e = match os::getenv(var.get()) {
99 cx.span_err(sp, msg.get());
102 Some(s) => cx.expr_str(sp, token::intern_and_get_ident(s.as_slice()))