22 lines
696 B
Rust
22 lines
696 B
Rust
import std::ivec;
|
|
import std::option;
|
|
import base::*;
|
|
import syntax::ast;
|
|
|
|
fn expand_syntax_ext(cx: &ext_ctxt, sp: codemap::span, arg: @ast::expr,
|
|
body: option::t[str]) -> @ast::expr {
|
|
let args: [@ast::expr] = alt arg.node {
|
|
ast::expr_vec(elts, _, _) { elts }
|
|
_ { cx.span_fatal(sp, "#ident_to_str requires a vector argument .") }
|
|
};
|
|
if ivec::len[@ast::expr](args) != 1u {
|
|
cx.span_fatal(sp, "malformed #ident_to_str call");
|
|
}
|
|
|
|
ret make_new_lit(cx, sp,
|
|
ast::lit_str(expr_to_ident(cx, args.(0u),
|
|
"expected an ident"),
|
|
ast::sk_rc));
|
|
|
|
}
|