60 lines
1.8 KiB
Rust
60 lines
1.8 KiB
Rust
// Copyright 2012-2013 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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/*
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* The compiler code necessary to support the env! extension. Eventually this
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* should all get sucked into either the compiler syntax extension plugin
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* interface.
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*/
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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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use std::os;
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pub fn expand_option_env(cx: &mut ExtCtxt, sp: Span, tts: &[ast::TokenTree])
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-> base::MacResult {
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let var = get_single_str_from_tts(cx, sp, tts, "option_env!");
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let e = match os::getenv(var) {
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None => quote_expr!(cx, ::std::option::None::<&'static str>),
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Some(s) => quote_expr!(cx, ::std::option::Some($s))
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};
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MRExpr(e)
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}
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pub fn expand_env(cx: &mut ExtCtxt, sp: Span, tts: &[ast::TokenTree])
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-> base::MacResult {
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let exprs = get_exprs_from_tts(cx, sp, tts);
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if exprs.len() == 0 {
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cx.span_fatal(sp, "env! takes 1 or 2 arguments");
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}
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let (var, _var_str_style) = expr_to_str(cx, exprs[0], "expected string literal");
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let msg = match exprs.len() {
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1 => format!("Environment variable {} not defined", var).to_managed(),
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2 => {
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let (s, _style) = expr_to_str(cx, exprs[1], "expected string literal");
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s
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}
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_ => cx.span_fatal(sp, "env! takes 1 or 2 arguments")
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};
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let e = match os::getenv(var) {
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None => cx.span_fatal(sp, msg),
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Some(s) => cx.expr_str(sp, s.to_managed())
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};
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MRExpr(e)
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}
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