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import base::*;
import ast;
import codemap::span;
import print::pprust;
export expand_line;
export expand_col;
export expand_file;
export expand_stringify;
export expand_mod;
export expand_include;
export expand_include_str;
export expand_include_bin;
/* #line(): expands to the current line number */
fn expand_line(cx: ext_ctxt, sp: span, arg: ast::mac_arg,
_body: ast::mac_body) -> @ast::expr {
get_mac_args(cx, sp, arg, 0u, option::some(0u), "line");
let loc = codemap::lookup_char_pos(cx.codemap(), sp.lo);
ret make_new_lit(cx, sp, ast::lit_uint(loc.line as u64, ast::ty_u));
}
/* #col(): expands to the current column number */
fn expand_col(cx: ext_ctxt, sp: span, arg: ast::mac_arg,
_body: ast::mac_body) -> @ast::expr {
get_mac_args(cx, sp, arg, 0u, option::some(0u), "col");
let loc = codemap::lookup_char_pos(cx.codemap(), sp.lo);
ret make_new_lit(cx, sp, ast::lit_uint(loc.col as u64, ast::ty_u));
}
/* #file(): expands to the current filename */
/* The filemap (`loc.file`) contains a bunch more information we could spit
* out if we wanted. */
fn expand_file(cx: ext_ctxt, sp: span, arg: ast::mac_arg,
_body: ast::mac_body) -> @ast::expr {
get_mac_args(cx, sp, arg, 0u, option::some(0u), "file");
let loc = codemap::lookup_char_pos(cx.codemap(), sp.lo);
ret make_new_lit(cx, sp, ast::lit_str(loc.file.name));
}
fn expand_stringify(cx: ext_ctxt, sp: span, arg: ast::mac_arg,
_body: ast::mac_body) -> @ast::expr {
let args = get_mac_args(cx, sp, arg, 1u, option::some(1u), "stringify");
ret make_new_lit(cx, sp, ast::lit_str(pprust::expr_to_str(args[0])));
}
fn expand_mod(cx: ext_ctxt, sp: span, arg: ast::mac_arg, _body: ast::mac_body)
-> @ast::expr {
get_mac_args(cx, sp, arg, 0u, option::some(0u), "file");
ret make_new_lit(cx, sp, ast::lit_str(str::connect(cx.mod_path(), "::")));
}
fn expand_include(cx: ext_ctxt, sp: span, arg: ast::mac_arg,
_body: ast::mac_body) -> @ast::expr {
let args = get_mac_args(cx, sp, arg, 1u, option::some(1u), "include");
let file = expr_to_str(cx, args[0], "#include_str requires a string");
let p = parse::new_parser_from_file(cx.parse_sess(), cx.cfg(),
res_rel_file(cx, sp, file),
parse::parser::SOURCE_FILE);
ret parse::parser::parse_expr(p)
}
fn expand_include_str(cx: ext_ctxt, sp: codemap::span, arg: ast::mac_arg,
_body: ast::mac_body) -> @ast::expr {
let args = get_mac_args(cx,sp,arg,1u,option::some(1u),"include_str");
let file = expr_to_str(cx, args[0], "#include_str requires a string");
alt io::read_whole_file_str(res_rel_file(cx, sp, file)) {
result::ok(src) { ret make_new_lit(cx, sp, ast::lit_str(src)); }
result::err(e) {
cx.parse_sess().span_diagnostic.handler().fatal(e)
}
}
}
fn expand_include_bin(cx: ext_ctxt, sp: codemap::span, arg: ast::mac_arg,
_body: ast::mac_body) -> @ast::expr {
let args = get_mac_args(cx,sp,arg,1u,option::some(1u),"include_bin");
let file = expr_to_str(cx, args[0], "#include_bin requires a string");
alt io::read_whole_file(res_rel_file(cx, sp, file)) {
result::ok(src) {
let u8_exprs = vec::map(src) { |char: u8|
make_new_lit(cx, sp, ast::lit_uint(char as u64, ast::ty_u8))
};
ret make_new_expr(cx, sp, ast::expr_vec(u8_exprs, ast::m_imm));
}
result::err(e) {
cx.parse_sess().span_diagnostic.handler().fatal(e)
}
}
}
fn res_rel_file(cx: ext_ctxt, sp: codemap::span, arg: path) -> path {
// NB: relative paths are resolved relative to the compilation unit
if !path::path_is_absolute(arg) {
let cu = codemap::span_to_filename(sp, cx.codemap());
let dir = path::dirname(cu);
ret path::connect(dir, arg);
} else {
ret arg;
}
}
//
// Local Variables:
// mode: rust
// fill-column: 78;
// indent-tabs-mode: nil
// c-basic-offset: 4
// buffer-file-coding-system: utf-8-unix
// End:
//
|
