1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
|
use base::*;
use codemap::{span, Loc, FileMap};
use print::pprust;
use build::{mk_base_vec_e,mk_uint,mk_u8,mk_uniq_str};
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 = cx.codemap().lookup_char_pos(sp.lo);
return mk_uint(cx, sp, loc.line);
}
/* 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 = cx.codemap().lookup_char_pos(sp.lo);
return mk_uint(cx, sp, loc.col.to_uint());
}
/* 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 { file: @FileMap { name: filename, _ }, _ } =
cx.codemap().lookup_char_pos(sp.lo);
return mk_uniq_str(cx, sp, filename);
}
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");
let s = pprust::expr_to_str(args[0], cx.parse_sess().interner);
return mk_uniq_str(cx, sp, s);
}
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");
return mk_uniq_str(cx, sp,
str::connect(cx.mod_path().map(
|x| cx.str_of(*x)), ~"::"));
}
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_sub_parser_from_file(
cx.parse_sess(), cx.cfg(),
&res_rel_file(cx, sp, &Path(file)), sp);
return p.parse_expr();
}
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");
let res = io::read_whole_file_str(&res_rel_file(cx, sp, &Path(file)));
match res {
result::Ok(_) => { /* Continue. */ }
result::Err(e) => {
cx.parse_sess().span_diagnostic.handler().fatal(e);
}
}
return mk_uniq_str(cx, sp, result::unwrap(res));
}
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");
match io::read_whole_file(&res_rel_file(cx, sp, &Path(file))) {
result::Ok(src) => {
let u8_exprs = vec::map(src, |char| {
mk_u8(cx, sp, *char)
});
return mk_base_vec_e(cx, sp, u8_exprs);
}
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 !arg.is_absolute {
let cu = Path(cx.codemap().span_to_filename(sp));
cu.dir_path().push_many(arg.components)
} else {
copy *arg
}
}
//
// Local Variables:
// mode: rust
// fill-column: 78;
// indent-tabs-mode: nil
// c-basic-offset: 4
// buffer-file-coding-system: utf-8-unix
// End:
//
|
