78 lines
1.9 KiB
Rust
78 lines
1.9 KiB
Rust
/*
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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 util::common;
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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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export expand_syntax_ext;
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// FIXME: Need to thread parser through here to handle errors correctly
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fn expand_syntax_ext(parser::parser p,
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common::span sp,
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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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p.err("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(p, args.(0));
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alt (generic_os::getenv(var)) {
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case (option::none[str]) {
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ret make_new_str(p, sp, "");
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}
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case (option::some[str](?s)) {
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ret make_new_str(p, sp, s);
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}
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}
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}
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// FIXME: duplicate code copied from extfmt:
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fn expr_to_str(parser::parser p,
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@ast::expr expr) -> str {
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alt (expr.node) {
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case (ast::expr_lit(?l, _)) {
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alt (l.node) {
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case (ast::lit_str(?s)) {
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ret s;
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}
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}
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}
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}
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p.err("malformed #env call");
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fail;
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}
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fn make_new_lit(parser::parser p, common::span sp, ast::lit_ lit)
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-> @ast::expr {
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auto sp_lit = @rec(node=lit, span=sp);
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auto expr = ast::expr_lit(sp_lit, p.get_ann());
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ret @rec(node=expr, span=sp);
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}
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fn make_new_str(parser::parser p, common::span sp, str s) -> @ast::expr {
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auto lit = ast::lit_str(s);
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ret make_new_lit(p, sp, lit);
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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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