34 lines
945 B
Rust
34 lines
945 B
Rust
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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 base::*;
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use build::mk_uniq_str;
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export expand_syntax_ext;
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fn expand_syntax_ext(cx: ext_ctxt, sp: codemap::span, arg: ast::mac_arg,
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_body: ast::mac_body) -> @ast::expr {
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let args = get_mac_args(cx, sp, arg, 1u, option::Some(1u), ~"env");
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// FIXME (#2248): if this was more thorough it would manufacture an
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// Option<str> rather than just an maybe-empty string.
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let var = expr_to_str(cx, args[0], ~"#env requires a string");
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match os::getenv(var) {
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option::None => return mk_uniq_str(cx, sp, ~""),
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option::Some(s) => return mk_uniq_str(cx, sp, s)
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}
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}
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//
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// Local Variables:
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// mode: rust
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// fill-column: 78;
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// indent-tabs-mode: nil
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// c-basic-offset: 4
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// buffer-file-coding-system: utf-8-unix
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// End:
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//
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