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/*
* The compiler code necessary to support the #env extension. Eventually this
* should all get sucked into either the compiler syntax extension plugin
* interface.
*/
import util.common;
import std.Str;
import std.Vec;
import std.Option;
import std.GenericOS;
export expand_syntax_ext;
// FIXME: Need to thread parser through here to handle errors correctly
fn expand_syntax_ext(parser.parser p,
common.span sp,
vec[@ast.expr] args,
Option.t[str] body) -> @ast.expr {
if (Vec.len[@ast.expr](args) != 1u) {
p.err("malformed #env call");
}
// FIXME: if this was more thorough it would manufacture an
// Option.t[str] rather than just an maybe-empty string.
auto var = expr_to_str(p, args.(0));
alt (GenericOS.getenv(var)) {
case (Option.none[str]) {
ret make_new_str(p, sp, "");
}
case (Option.some[str](?s)) {
ret make_new_str(p, sp, s);
}
}
}
// FIXME: duplicate code copied from extfmt.
fn expr_to_str(parser.parser p,
@ast.expr expr) -> str {
alt (expr.node) {
case (ast.expr_lit(?l, _)) {
alt (l.node) {
case (ast.lit_str(?s)) {
ret s;
}
}
}
}
p.err("malformed #env call");
fail;
}
fn make_new_lit(parser.parser p, common.span sp, ast.lit_ lit) -> @ast.expr {
auto sp_lit = @rec(node=lit, span=sp);
auto expr = ast.expr_lit(sp_lit, p.get_ann());
ret @rec(node=expr, span=sp);
}
fn make_new_str(parser.parser p, common.span sp, str s) -> @ast.expr {
auto lit = ast.lit_str(s);
ret make_new_lit(p, sp, lit);
}
//
// Local Variables:
// mode: rust
// fill-column: 78;
// indent-tabs-mode: nil
// c-basic-offset: 4
// buffer-file-coding-system: utf-8-unix
// compile-command: "make -k -C $RBUILD 2>&1 | sed -e 's/\\/x\\//x:\\//g'";
// End:
//
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