rust/src/libsyntax/ext/source_util.rs

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// Copyright 2012-2013 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use ast;
use codemap;
use codemap::{Pos, Span};
use codemap::{ExpnInfo, NameAndSpan};
use ext::base::*;
use ext::base;
use ext::build::AstBuilder;
use parse;
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use parse::token::{get_ident_interner};
use print::pprust;
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use std::cell::RefCell;
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use std::io;
use std::io::File;
use std::str;
// These macros all relate to the file system; they either return
// the column/row/filename of the expression, or they include
// a given file into the current one.
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/* line!(): expands to the current line number */
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pub fn expand_line(cx: &mut ExtCtxt, sp: Span, tts: &[ast::token_tree])
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-> base::MacResult {
base::check_zero_tts(cx, sp, tts, "line!");
let topmost = topmost_expn_info(cx.backtrace().unwrap());
let loc = cx.codemap().lookup_char_pos(topmost.call_site.lo);
base::MRExpr(cx.expr_uint(topmost.call_site, loc.line))
}
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/* col!(): expands to the current column number */
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pub fn expand_col(cx: &mut ExtCtxt, sp: Span, tts: &[ast::token_tree])
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-> base::MacResult {
base::check_zero_tts(cx, sp, tts, "col!");
let topmost = topmost_expn_info(cx.backtrace().unwrap());
let loc = cx.codemap().lookup_char_pos(topmost.call_site.lo);
base::MRExpr(cx.expr_uint(topmost.call_site, loc.col.to_uint()))
}
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/* file!(): expands to the current filename */
/* The filemap (`loc.file`) contains a bunch more information we could spit
* out if we wanted. */
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pub fn expand_file(cx: &mut ExtCtxt, sp: Span, tts: &[ast::token_tree])
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-> base::MacResult {
base::check_zero_tts(cx, sp, tts, "file!");
let topmost = topmost_expn_info(cx.backtrace().unwrap());
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let loc = cx.codemap().lookup_char_pos(topmost.call_site.lo);
let filename = loc.file.name;
base::MRExpr(cx.expr_str(topmost.call_site, filename))
}
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pub fn expand_stringify(cx: &mut ExtCtxt, sp: Span, tts: &[ast::token_tree])
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-> base::MacResult {
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let s = pprust::tts_to_str(tts, get_ident_interner());
base::MRExpr(cx.expr_str(sp, s.to_managed()))
}
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pub fn expand_mod(cx: &mut ExtCtxt, sp: Span, tts: &[ast::token_tree])
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-> base::MacResult {
base::check_zero_tts(cx, sp, tts, "module_path!");
base::MRExpr(cx.expr_str(sp,
cx.mod_path().map(|x| cx.str_of(*x)).connect("::").to_managed()))
}
// include! : parse the given file as an expr
// This is generally a bad idea because it's going to behave
// unhygienically.
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pub fn expand_include(cx: &mut ExtCtxt, sp: Span, tts: &[ast::token_tree])
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-> base::MacResult {
let file = get_single_str_from_tts(cx, sp, tts, "include!");
// The file will be added to the code map by the parser
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let mut p =
parse::new_sub_parser_from_file(cx.parse_sess(),
cx.cfg(),
&res_rel_file(cx,
sp,
&Path::new(file)),
sp);
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base::MRExpr(p.parse_expr())
}
// include_str! : read the given file, insert it as a literal string expr
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pub fn expand_include_str(cx: &mut ExtCtxt, sp: Span, tts: &[ast::token_tree])
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-> base::MacResult {
let file = get_single_str_from_tts(cx, sp, tts, "include_str!");
let file = res_rel_file(cx, sp, &Path::new(file));
let bytes = match io::result(|| File::open(&file).read_to_end()) {
Err(e) => {
cx.span_fatal(sp, format!("couldn't read {}: {}",
file.display(), e.desc));
}
Ok(bytes) => bytes,
};
match str::from_utf8_owned_opt(bytes) {
Some(s) => {
let s = s.to_managed();
// Add this input file to the code map to make it available as
// dependency information
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let mut files = cx.parse_sess.cm.files.borrow_mut();
files.get().push(@codemap::FileMap {
name: file.display().to_str().to_managed(),
substr: codemap::FssNone,
src: s,
start_pos: codemap::BytePos(0),
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lines: RefCell::new(~[]),
multibyte_chars: RefCell::new(~[]),
});
base::MRExpr(cx.expr_str(sp, s))
}
None => {
cx.span_fatal(sp, format!("{} wasn't a utf-8 file", file.display()));
}
}
}
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pub fn expand_include_bin(cx: &mut ExtCtxt, sp: Span, tts: &[ast::token_tree])
-> base::MacResult
{
use std::at_vec;
let file = get_single_str_from_tts(cx, sp, tts, "include_bin!");
let file = res_rel_file(cx, sp, &Path::new(file));
match io::result(|| File::open(&file).read_to_end()) {
Err(e) => {
cx.span_fatal(sp, format!("couldn't read {}: {}",
file.display(), e.desc));
}
Ok(bytes) => {
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let bytes = at_vec::to_managed_move(bytes);
base::MRExpr(cx.expr_lit(sp, ast::lit_binary(bytes)))
}
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}
}
// recur along an ExpnInfo chain to find the original expression
fn topmost_expn_info(expn_info: @codemap::ExpnInfo) -> @codemap::ExpnInfo {
match *expn_info {
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ExpnInfo { call_site: ref call_site, .. } => {
match call_site.expn_info {
Some(next_expn_info) => {
match *next_expn_info {
ExpnInfo {
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callee: NameAndSpan { name: ref name, .. },
..
} => {
// Don't recurse into file using "include!"
if "include" == *name {
expn_info
} else {
topmost_expn_info(next_expn_info)
}
}
}
},
None => expn_info
}
}
}
}
// resolve a file-system path to an absolute file-system path (if it
// isn't already)
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fn res_rel_file(cx: &mut ExtCtxt, sp: codemap::Span, arg: &Path) -> Path {
// NB: relative paths are resolved relative to the compilation unit
if !arg.is_absolute() {
let mut cu = Path::new(cx.codemap().span_to_filename(sp));
cu.pop();
cu.push(arg);
cu
} else {
arg.clone()
}
}