2014-01-04 14:16:57 -06:00
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// Copyright 2012-2013 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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2012-12-03 18:48:01 -06:00
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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2013-02-25 13:11:21 -06:00
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use ast;
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use codemap;
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use codemap::{Pos, Span};
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use codemap::{ExpnInfo, NameAndSpan};
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use ext::base::*;
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use ext::base;
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use ext::build::AstBuilder;
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use parse;
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use parse::token::{get_ident_interner};
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use print::pprust;
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use std::cell::RefCell;
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use std::io;
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use std::io::File;
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use std::str;
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2013-05-24 21:35:29 -05:00
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2013-02-26 12:15:29 -06:00
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// These macros all relate to the file system; they either return
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// the column/row/filename of the expression, or they include
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// a given file into the current one.
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2012-08-22 19:24:52 -05:00
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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 {
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base::check_zero_tts(cx, sp, tts, "line!");
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let topmost = topmost_expn_info(cx.backtrace().unwrap());
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let loc = cx.codemap().lookup_char_pos(topmost.call_site.lo);
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base::MRExpr(cx.expr_uint(topmost.call_site, loc.line))
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}
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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 {
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base::check_zero_tts(cx, sp, tts, "col!");
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let topmost = topmost_expn_info(cx.backtrace().unwrap());
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let loc = cx.codemap().lookup_char_pos(topmost.call_site.lo);
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base::MRExpr(cx.expr_uint(topmost.call_site, loc.col.to_uint()))
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}
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/* file!(): expands to the current filename */
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/* The filemap (`loc.file`) contains a bunch more information we could spit
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* 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 {
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base::check_zero_tts(cx, sp, tts, "file!");
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let topmost = topmost_expn_info(cx.backtrace().unwrap());
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let loc = cx.codemap().lookup_char_pos(topmost.call_site.lo);
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let filename = loc.file.name;
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base::MRExpr(cx.expr_str(topmost.call_site, filename))
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}
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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());
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base::MRExpr(cx.expr_str(sp, s.to_managed()))
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}
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pub fn expand_mod(cx: &mut ExtCtxt, sp: Span, tts: &[ast::token_tree])
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-> base::MacResult {
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base::check_zero_tts(cx, sp, tts, "module_path!");
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base::MRExpr(cx.expr_str(sp,
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cx.mod_path().map(|x| cx.str_of(*x)).connect("::").to_managed()))
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}
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// include! : parse the given file as an expr
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// This is generally a bad idea because it's going to behave
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// unhygienically.
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pub fn expand_include(cx: &mut ExtCtxt, sp: Span, tts: &[ast::token_tree])
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-> base::MacResult {
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let file = get_single_str_from_tts(cx, sp, tts, "include!");
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// The file will be added to the code map by the parser
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let mut p =
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parse::new_sub_parser_from_file(cx.parse_sess(),
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cx.cfg(),
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&res_rel_file(cx,
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sp,
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&Path::new(file)),
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sp);
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base::MRExpr(p.parse_expr())
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}
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// 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 {
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let file = get_single_str_from_tts(cx, sp, tts, "include_str!");
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let file = res_rel_file(cx, sp, &Path::new(file));
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let bytes = match io::result(|| File::open(&file).read_to_end()) {
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Err(e) => {
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cx.span_fatal(sp, format!("couldn't read {}: {}",
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file.display(), e.desc));
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}
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Ok(bytes) => bytes,
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};
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match str::from_utf8_owned_opt(bytes) {
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Some(s) => {
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let s = s.to_managed();
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// Add this input file to the code map to make it available as
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// dependency information
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let mut files = cx.parse_sess.cm.files.borrow_mut();
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files.get().push(@codemap::FileMap {
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name: file.display().to_str().to_managed(),
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substr: codemap::FssNone,
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src: s,
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start_pos: codemap::BytePos(0),
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lines: RefCell::new(~[]),
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multibyte_chars: RefCell::new(~[]),
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});
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base::MRExpr(cx.expr_str(sp, s))
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}
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None => {
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cx.span_fatal(sp, format!("{} wasn't a utf-8 file", file.display()));
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}
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}
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}
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pub fn expand_include_bin(cx: &mut ExtCtxt, sp: Span, tts: &[ast::token_tree])
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-> base::MacResult
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{
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use std::at_vec;
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let file = get_single_str_from_tts(cx, sp, tts, "include_bin!");
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let file = res_rel_file(cx, sp, &Path::new(file));
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match io::result(|| File::open(&file).read_to_end()) {
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Err(e) => {
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cx.span_fatal(sp, format!("couldn't read {}: {}",
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file.display(), e.desc));
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}
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Ok(bytes) => {
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let bytes = at_vec::to_managed_move(bytes);
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base::MRExpr(cx.expr_lit(sp, ast::lit_binary(bytes)))
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}
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2012-05-18 12:03:27 -05:00
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}
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}
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// recur along an ExpnInfo chain to find the original expression
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fn topmost_expn_info(expn_info: @codemap::ExpnInfo) -> @codemap::ExpnInfo {
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match *expn_info {
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ExpnInfo { call_site: ref call_site, .. } => {
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match call_site.expn_info {
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Some(next_expn_info) => {
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match *next_expn_info {
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ExpnInfo {
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callee: NameAndSpan { name: ref name, .. },
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..
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} => {
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// Don't recurse into file using "include!"
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if "include" == *name {
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expn_info
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} else {
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topmost_expn_info(next_expn_info)
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}
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}
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}
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},
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None => expn_info
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}
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}
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}
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}
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// resolve a file-system path to an absolute file-system path (if it
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// isn't already)
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fn res_rel_file(cx: &mut ExtCtxt, sp: codemap::Span, arg: &Path) -> Path {
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// NB: relative paths are resolved relative to the compilation unit
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if !arg.is_absolute() {
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let mut cu = Path::new(cx.codemap().span_to_filename(sp));
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cu.pop();
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cu.push(arg);
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cu
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} else {
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arg.clone()
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}
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}
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