205 lines
7.5 KiB
Rust
205 lines
7.5 KiB
Rust
// 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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// 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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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;
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use print::pprust;
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use std::gc::Gc;
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use std::io::File;
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use std::rc::Rc;
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use std::str;
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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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/// line!(): expands to the current line number
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pub fn expand_line(cx: &mut ExtCtxt, sp: Span, tts: &[ast::TokenTree])
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-> Box<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::MacExpr::new(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::TokenTree])
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-> Box<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::MacExpr::new(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::TokenTree])
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-> Box<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 = token::intern_and_get_ident(loc.file.name.as_slice());
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base::MacExpr::new(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::TokenTree])
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-> Box<base::MacResult> {
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let s = pprust::tts_to_string(tts);
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base::MacExpr::new(cx.expr_str(sp,
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token::intern_and_get_ident(s.as_slice())))
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}
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pub fn expand_mod(cx: &mut ExtCtxt, sp: Span, tts: &[ast::TokenTree])
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-> Box<base::MacResult> {
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base::check_zero_tts(cx, sp, tts, "module_path!");
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let string = cx.mod_path()
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.iter()
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.map(|x| token::get_ident(*x).get().to_string())
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.collect::<Vec<String>>()
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.connect("::");
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base::MacExpr::new(cx.expr_str(
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sp,
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token::intern_and_get_ident(string.as_slice())))
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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::TokenTree])
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-> Box<base::MacResult> {
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let file = match get_single_str_from_tts(cx, sp, tts, "include!") {
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Some(f) => f,
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None => return DummyResult::expr(sp),
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};
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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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true,
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None,
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sp);
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base::MacExpr::new(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::TokenTree])
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-> Box<base::MacResult> {
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let file = match get_single_str_from_tts(cx, sp, tts, "include_str!") {
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Some(f) => f,
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None => return DummyResult::expr(sp)
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};
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let file = res_rel_file(cx, sp, &Path::new(file));
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let bytes = match File::open(&file).read_to_end() {
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Err(e) => {
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cx.span_err(sp,
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format!("couldn't read {}: {}",
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file.display(),
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e).as_slice());
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return DummyResult::expr(sp);
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}
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Ok(bytes) => bytes,
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};
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match str::from_utf8(bytes.as_slice()) {
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Some(src) => {
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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 filename = file.display().to_string();
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let interned = token::intern_and_get_ident(src);
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cx.codemap().new_filemap(filename, src.to_string());
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base::MacExpr::new(cx.expr_str(sp, interned))
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}
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None => {
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cx.span_err(sp,
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format!("{} wasn't a utf-8 file",
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file.display()).as_slice());
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return DummyResult::expr(sp);
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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::TokenTree])
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-> Box<base::MacResult> {
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let file = match get_single_str_from_tts(cx, sp, tts, "include_bin!") {
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Some(f) => f,
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None => return DummyResult::expr(sp)
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};
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let file = res_rel_file(cx, sp, &Path::new(file));
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match File::open(&file).read_to_end() {
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Err(e) => {
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cx.span_err(sp,
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format!("couldn't read {}: {}",
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file.display(),
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e).as_slice());
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return DummyResult::expr(sp);
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}
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Ok(bytes) => {
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let bytes = bytes.iter().map(|x| *x).collect();
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base::MacExpr::new(cx.expr_lit(sp, ast::LitBinary(Rc::new(bytes))))
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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: Gc<codemap::ExpnInfo>) -> Gc<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.as_slice() {
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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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