1 // Copyright 2012-2013 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
12 use syntax_pos::{self, Pos, Span};
15 use ext::build::AstBuilder;
16 use parse::{token, DirectoryOwnership};
22 use util::small_vector::SmallVector;
25 use std::io::prelude::*;
26 use std::path::{Path, PathBuf};
29 // These macros all relate to the file system; they either return
30 // the column/row/filename of the expression, or they include
31 // a given file into the current one.
33 /// line!(): expands to the current line number
34 pub fn expand_line(cx: &mut ExtCtxt, sp: Span, tts: &[tokenstream::TokenTree])
35 -> Box<base::MacResult+'static> {
36 base::check_zero_tts(cx, sp, tts, "line!");
38 let topmost = cx.expansion_cause().unwrap_or(sp);
39 let loc = cx.codemap().lookup_char_pos(topmost.lo);
41 base::MacEager::expr(cx.expr_u32(topmost, loc.line as u32))
44 /* column!(): expands to the current column number */
45 pub fn expand_column(cx: &mut ExtCtxt, sp: Span, tts: &[tokenstream::TokenTree])
46 -> Box<base::MacResult+'static> {
47 base::check_zero_tts(cx, sp, tts, "column!");
49 let topmost = cx.expansion_cause().unwrap_or(sp);
50 let loc = cx.codemap().lookup_char_pos(topmost.lo);
52 base::MacEager::expr(cx.expr_u32(topmost, loc.col.to_usize() as u32))
55 /// file!(): expands to the current filename */
56 /// The filemap (`loc.file`) contains a bunch more information we could spit
58 pub fn expand_file(cx: &mut ExtCtxt, sp: Span, tts: &[tokenstream::TokenTree])
59 -> Box<base::MacResult+'static> {
60 base::check_zero_tts(cx, sp, tts, "file!");
62 let topmost = cx.expansion_cause().unwrap_or(sp);
63 let loc = cx.codemap().lookup_char_pos(topmost.lo);
64 base::MacEager::expr(cx.expr_str(topmost, Symbol::intern(&loc.file.name)))
67 pub fn expand_stringify(cx: &mut ExtCtxt, sp: Span, tts: &[tokenstream::TokenTree])
68 -> Box<base::MacResult+'static> {
69 let s = pprust::tts_to_string(tts);
70 base::MacEager::expr(cx.expr_str(sp, Symbol::intern(&s)))
73 pub fn expand_mod(cx: &mut ExtCtxt, sp: Span, tts: &[tokenstream::TokenTree])
74 -> Box<base::MacResult+'static> {
75 base::check_zero_tts(cx, sp, tts, "module_path!");
76 let mod_path = &cx.current_expansion.module.mod_path;
77 let string = mod_path.iter().map(|x| x.to_string()).collect::<Vec<String>>().join("::");
79 base::MacEager::expr(cx.expr_str(sp, Symbol::intern(&string)))
82 /// include! : parse the given file as an expr
83 /// This is generally a bad idea because it's going to behave
85 pub fn expand_include<'cx>(cx: &'cx mut ExtCtxt, sp: Span, tts: &[tokenstream::TokenTree])
86 -> Box<base::MacResult+'cx> {
87 let file = match get_single_str_from_tts(cx, sp, tts, "include!") {
89 None => return DummyResult::expr(sp),
91 // The file will be added to the code map by the parser
92 let path = res_rel_file(cx, sp, Path::new(&file));
93 let directory_ownership = DirectoryOwnership::Owned;
94 let p = parse::new_sub_parser_from_file(cx.parse_sess(), &path, directory_ownership, None, sp);
96 struct ExpandResult<'a> {
97 p: parse::parser::Parser<'a>,
99 impl<'a> base::MacResult for ExpandResult<'a> {
100 fn make_expr(mut self: Box<ExpandResult<'a>>) -> Option<P<ast::Expr>> {
101 Some(panictry!(self.p.parse_expr()))
103 fn make_items(mut self: Box<ExpandResult<'a>>)
104 -> Option<SmallVector<P<ast::Item>>> {
105 let mut ret = SmallVector::new();
106 while self.p.token != token::Eof {
107 match panictry!(self.p.parse_item()) {
108 Some(item) => ret.push(item),
109 None => panic!(self.p.diagnostic().span_fatal(self.p.span,
110 &format!("expected item, found `{}`",
111 self.p.this_token_to_string())))
118 Box::new(ExpandResult { p: p })
121 // include_str! : read the given file, insert it as a literal string expr
122 pub fn expand_include_str(cx: &mut ExtCtxt, sp: Span, tts: &[tokenstream::TokenTree])
123 -> Box<base::MacResult+'static> {
124 let file = match get_single_str_from_tts(cx, sp, tts, "include_str!") {
126 None => return DummyResult::expr(sp)
128 let file = res_rel_file(cx, sp, Path::new(&file));
129 let mut bytes = Vec::new();
130 match File::open(&file).and_then(|mut f| f.read_to_end(&mut bytes)) {
134 &format!("couldn't read {}: {}",
137 return DummyResult::expr(sp);
140 match String::from_utf8(bytes) {
142 // Add this input file to the code map to make it available as
143 // dependency information
144 let filename = format!("{}", file.display());
145 cx.codemap().new_filemap_and_lines(&filename, &src);
147 base::MacEager::expr(cx.expr_str(sp, Symbol::intern(&src)))
151 &format!("{} wasn't a utf-8 file",
153 DummyResult::expr(sp)
158 pub fn expand_include_bytes(cx: &mut ExtCtxt, sp: Span, tts: &[tokenstream::TokenTree])
159 -> Box<base::MacResult+'static> {
160 let file = match get_single_str_from_tts(cx, sp, tts, "include_bytes!") {
162 None => return DummyResult::expr(sp)
164 let file = res_rel_file(cx, sp, Path::new(&file));
165 let mut bytes = Vec::new();
166 match File::open(&file).and_then(|mut f| f.read_to_end(&mut bytes)) {
169 &format!("couldn't read {}: {}", file.display(), e));
170 DummyResult::expr(sp)
173 // Add this input file to the code map to make it available as
174 // dependency information, but don't enter it's contents
175 let filename = format!("{}", file.display());
176 cx.codemap().new_filemap_and_lines(&filename, "");
178 base::MacEager::expr(cx.expr_lit(sp, ast::LitKind::ByteStr(Rc::new(bytes))))
183 // resolve a file-system path to an absolute file-system path (if it
185 fn res_rel_file(cx: &mut ExtCtxt, sp: syntax_pos::Span, arg: &Path) -> PathBuf {
186 // NB: relative paths are resolved relative to the compilation unit
187 if !arg.is_absolute() {
188 let callsite = sp.source_callsite();
189 let mut cu = PathBuf::from(&cx.codemap().span_to_filename(callsite));