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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;
use parse::token::{get_ident_interner};
use print::pprust;
use std::io;
use std::result;
// 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.
/* line!(): expands to the current line number */
pub fn expand_line(cx: @ExtCtxt, sp: Span, tts: &[ast::token_tree])
-> 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))
}
/* col!(): expands to the current column number */
pub fn expand_col(cx: @ExtCtxt, sp: Span, tts: &[ast::token_tree])
-> 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()))
}
/* file!(): expands to the current filename */
/* The filemap (`loc.file`) contains a bunch more information we could spit
* out if we wanted. */
pub fn expand_file(cx: @ExtCtxt, sp: Span, tts: &[ast::token_tree])
-> base::MacResult {
base::check_zero_tts(cx, sp, tts, "file!");
let topmost = topmost_expn_info(cx.backtrace().unwrap());
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))
}
pub fn expand_stringify(cx: @ExtCtxt, sp: Span, tts: &[ast::token_tree])
-> base::MacResult {
let s = pprust::tts_to_str(tts, get_ident_interner());
base::MRExpr(cx.expr_str(sp, s.to_managed()))
}
pub fn expand_mod(cx: @ExtCtxt, sp: Span, tts: &[ast::token_tree])
-> 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.
pub fn expand_include(cx: @ExtCtxt, sp: Span, tts: &[ast::token_tree])
-> base::MacResult {
let file = get_single_str_from_tts(cx, sp, tts, "include!");
let p = parse::new_sub_parser_from_file(
cx.parse_sess(), cx.cfg(),
&res_rel_file(cx, sp, &Path::new(file)), sp);
base::MRExpr(p.parse_expr())
}
// include_str! : read the given file, insert it as a literal string expr
pub fn expand_include_str(cx: @ExtCtxt, sp: Span, tts: &[ast::token_tree])
-> base::MacResult {
let file = get_single_str_from_tts(cx, sp, tts, "include_str!");
let res = io::read_whole_file_str(&res_rel_file(cx, sp, &Path::new(file)));
match res {
result::Ok(res) => {
base::MRExpr(cx.expr_str(sp, res.to_managed()))
}
result::Err(e) => {
cx.span_fatal(sp, e);
}
}
}
pub fn expand_include_bin(cx: @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!");
match io::read_whole_file(&res_rel_file(cx, sp, &Path::new(file))) {
result::Ok(src) => {
let v = at_vec::to_managed_move(src);
base::MRExpr(cx.expr_lit(sp, ast::lit_binary(v)))
}
result::Err(ref e) => {
cx.parse_sess().span_diagnostic.handler().fatal((*e))
}
}
}
// recur along an ExpnInfo chain to find the original expression
fn topmost_expn_info(expn_info: @codemap::ExpnInfo) -> @codemap::ExpnInfo {
match *expn_info {
ExpnInfo { call_site: ref call_site, _ } => {
match call_site.expn_info {
Some(next_expn_info) => {
match *next_expn_info {
ExpnInfo {
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)
fn res_rel_file(cx: @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()
}
}
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