6fd6fdea93
src/comp/syntax is currently just a sub-module of rustc, but it will, in the near future, be its own crate. This includes: - The AST data structure - The parser - The pretty-printer - Visit, walk, and fold - The syntax extension system - Some utility stuff that should be in the stdlib* *) Stdlib extensions currently require a snapshot before they can be used, and the win build is very broken right now. This is temporary and will be cleaned up when one of those problems goes away. A lot of code was moved by this patch, mostly towards a more organized layout. Some package paths did get longer, and I guess the new layout will take some getting used to. Sorry about that! Please try not to re-introduce any dependencies in syntax/ on any of the other src/comp/ subdirs.
48 lines
1.4 KiB
Rust
48 lines
1.4 KiB
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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import std::str;
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import std::vec;
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import std::option;
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import std::generic_os;
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import base::*;
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export expand_syntax_ext;
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fn expand_syntax_ext(&ext_ctxt cx, codemap::span sp, &vec[@ast::expr] args,
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option::t[str] body) -> @ast::expr {
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if (vec::len[@ast::expr](args) != 1u) {
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cx.span_fatal(sp, "malformed #env call");
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}
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// FIXME: if this was more thorough it would manufacture an
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// option::t[str] rather than just an maybe-empty string.
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auto var = expr_to_str(cx, args.(0), "#env requires a string");
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alt (generic_os::getenv(var)) {
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case (option::none) { ret make_new_str(cx, sp, ""); }
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case (option::some(?s)) { ret make_new_str(cx, sp, s); }
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}
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}
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fn make_new_lit(&ext_ctxt cx, codemap::span sp, ast::lit_ lit) -> @ast::expr {
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auto sp_lit = @rec(node=lit, span=sp);
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ret @rec(id=cx.next_id(), node=ast::expr_lit(sp_lit), span=sp);
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}
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fn make_new_str(&ext_ctxt cx, codemap::span sp, str s) -> @ast::expr {
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ret make_new_lit(cx, sp, ast::lit_str(s, ast::sk_rc));
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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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// compile-command: "make -k -C $RBUILD 2>&1 | sed -e 's/\\/x\\//x:\\//g'";
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// End:
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//
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