2013-02-11 15:06:37 -06:00
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// Copyright 2012-2013 The Rust Project Developers. See the
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// COPYRIGHT 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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2013-05-17 17:28:44 -05:00
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use core::prelude::*;
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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::{FileMap, Loc, Pos, ExpandedFrom, span};
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use codemap::{CallInfo, 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 print::pprust;
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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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2013-02-11 10:13:18 -06:00
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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: @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().get());
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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: @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().get());
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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: @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().get());
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let Loc { file: @FileMap { name: filename, _ }, _ } =
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cx.codemap().lookup_char_pos(topmost.call_site.lo);
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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: @ExtCtxt, sp: span, tts: &[ast::token_tree])
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-> base::MacResult {
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let s = pprust::tts_to_str(tts, cx.parse_sess().interner);
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base::MRExpr(cx.expr_str(sp, s))
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}
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pub fn expand_mod(cx: @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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str::connect(cx.mod_path().map(
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|x| cx.str_of(*x)), "::")))
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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: @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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let p = parse::new_sub_parser_from_file(
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cx.parse_sess(), cx.cfg(),
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&res_rel_file(cx, sp, &Path(file)), 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: @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 res = io::read_whole_file_str(&res_rel_file(cx, sp, &Path(file)));
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match res {
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result::Ok(_) => { /* Continue. */ }
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result::Err(ref e) => {
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cx.parse_sess().span_diagnostic.handler().fatal((*e));
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}
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}
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base::MRExpr(cx.expr_str(sp, result::unwrap(res)))
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}
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pub fn expand_include_bin(cx: @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_bin!");
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match io::read_whole_file(&res_rel_file(cx, sp, &Path(file))) {
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result::Ok(src) => {
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let u8_exprs = vec::map(src, |char| {
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cx.expr_u8(sp, *char)
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});
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base::MRExpr(cx.expr_vec(sp, u8_exprs))
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}
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result::Err(ref e) => {
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cx.parse_sess().span_diagnostic.handler().fatal((*e))
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}
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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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ExpandedFrom(CallInfo { 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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ExpandedFrom(CallInfo {
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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 *name == ~"include" {
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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: @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 cu = Path(cx.codemap().span_to_filename(sp));
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cu.dir_path().push_many(arg.components)
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} else {
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copy *arg
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}
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}
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