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use crate::ast;
use crate::ext::base::{self, *};
use crate::ext::build::AstBuilder;
use crate::parse::{self, token, DirectoryOwnership};
use crate::print::pprust;
use crate::ptr::P;
use crate::symbol::Symbol;
use crate::tokenstream;
use smallvec::SmallVec;
use syntax_pos::{self, Pos, Span, FileName};
use std::fs;
use std::io::ErrorKind;
use std::path::PathBuf;
use rustc_data_structures::sync::Lrc;
pub fn expand_line(cx: &mut ExtCtxt<'_>, sp: Span, tts: &[tokenstream::TokenTree])
-> Box<dyn base::MacResult+'static> {
base::check_zero_tts(cx, sp, tts, "line!");
let topmost = cx.expansion_cause().unwrap_or(sp);
let loc = cx.source_map().lookup_char_pos(topmost.lo());
base::MacEager::expr(cx.expr_u32(topmost, loc.line as u32))
}
pub fn expand_column(cx: &mut ExtCtxt<'_>, sp: Span, tts: &[tokenstream::TokenTree])
-> Box<dyn base::MacResult+'static> {
base::check_zero_tts(cx, sp, tts, "column!");
let topmost = cx.expansion_cause().unwrap_or(sp);
let loc = cx.source_map().lookup_char_pos(topmost.lo());
base::MacEager::expr(cx.expr_u32(topmost, loc.col.to_usize() as u32 + 1))
}
pub fn expand_file(cx: &mut ExtCtxt<'_>, sp: Span, tts: &[tokenstream::TokenTree])
-> Box<dyn base::MacResult+'static> {
base::check_zero_tts(cx, sp, tts, "file!");
let topmost = cx.expansion_cause().unwrap_or(sp);
let loc = cx.source_map().lookup_char_pos(topmost.lo());
base::MacEager::expr(cx.expr_str(topmost, Symbol::intern(&loc.file.name.to_string())))
}
pub fn expand_stringify(cx: &mut ExtCtxt<'_>, sp: Span, tts: &[tokenstream::TokenTree])
-> Box<dyn base::MacResult+'static> {
let s = pprust::tts_to_string(tts);
base::MacEager::expr(cx.expr_str(sp, Symbol::intern(&s)))
}
pub fn expand_mod(cx: &mut ExtCtxt<'_>, sp: Span, tts: &[tokenstream::TokenTree])
-> Box<dyn base::MacResult+'static> {
base::check_zero_tts(cx, sp, tts, "module_path!");
let mod_path = &cx.current_expansion.module.mod_path;
let string = mod_path.iter().map(|x| x.to_string()).collect::<Vec<String>>().join("::");
base::MacEager::expr(cx.expr_str(sp, Symbol::intern(&string)))
}
pub fn expand_include<'cx>(cx: &'cx mut ExtCtxt<'_>, sp: Span, tts: &[tokenstream::TokenTree])
-> Box<dyn base::MacResult+'cx> {
let file = match get_single_str_from_tts(cx, sp, tts, "include!") {
Some(f) => f,
None => return DummyResult::any(sp),
};
let path = res_rel_file(cx, sp, file);
let directory_ownership = DirectoryOwnership::Owned { relative: None };
let p = parse::new_sub_parser_from_file(cx.parse_sess(), &path, directory_ownership, None, sp);
struct ExpandResult<'a> {
p: parse::parser::Parser<'a>,
}
impl<'a> base::MacResult for ExpandResult<'a> {
fn make_expr(mut self: Box<ExpandResult<'a>>) -> Option<P<ast::Expr>> {
Some(panictry!(self.p.parse_expr()))
}
fn make_items(mut self: Box<ExpandResult<'a>>) -> Option<SmallVec<[P<ast::Item>; 1]>> {
let mut ret = SmallVec::new();
while self.p.token != token::Eof {
match panictry!(self.p.parse_item()) {
Some(item) => ret.push(item),
None => self.p.diagnostic().span_fatal(self.p.token.span,
&format!("expected item, found `{}`",
self.p.this_token_to_string()))
.raise()
}
}
Some(ret)
}
}
Box::new(ExpandResult { p })
}
pub fn expand_include_str(cx: &mut ExtCtxt<'_>, sp: Span, tts: &[tokenstream::TokenTree])
-> Box<dyn base::MacResult+'static> {
let file = match get_single_str_from_tts(cx, sp, tts, "include_str!") {
Some(f) => f,
None => return DummyResult::expr(sp)
};
let file = res_rel_file(cx, sp, file);
match fs::read_to_string(&file) {
Ok(src) => {
let interned_src = Symbol::intern(&src);
cx.source_map().new_source_file(file.into(), src);
base::MacEager::expr(cx.expr_str(sp, interned_src))
},
Err(ref e) if e.kind() == ErrorKind::InvalidData => {
cx.span_err(sp, &format!("{} wasn't a utf-8 file", file.display()));
DummyResult::expr(sp)
}
Err(e) => {
cx.span_err(sp, &format!("couldn't read {}: {}", file.display(), e));
DummyResult::expr(sp)
}
}
}
pub fn expand_include_bytes(cx: &mut ExtCtxt<'_>, sp: Span, tts: &[tokenstream::TokenTree])
-> Box<dyn base::MacResult+'static> {
let file = match get_single_str_from_tts(cx, sp, tts, "include_bytes!") {
Some(f) => f,
None => return DummyResult::expr(sp)
};
let file = res_rel_file(cx, sp, file);
match fs::read(&file) {
Ok(bytes) => {
let (contents, bytes) = match String::from_utf8(bytes) {
Ok(s) => {
let bytes = s.as_bytes().to_owned();
(s, bytes)
},
Err(e) => (String::new(), e.into_bytes()),
};
cx.source_map().new_source_file(file.into(), contents);
base::MacEager::expr(cx.expr_lit(sp, ast::LitKind::ByteStr(Lrc::new(bytes))))
},
Err(e) => {
cx.span_err(sp, &format!("couldn't read {}: {}", file.display(), e));
DummyResult::expr(sp)
}
}
}
fn res_rel_file(cx: &mut ExtCtxt<'_>, sp: syntax_pos::Span, arg: String) -> PathBuf {
let arg = PathBuf::from(arg);
if !arg.is_absolute() {
let callsite = sp.source_callsite();
let mut path = match cx.source_map().span_to_unmapped_path(callsite) {
FileName::Real(path) => path,
FileName::DocTest(path, _) => path,
other => panic!("cannot resolve relative path in non-file source `{}`", other),
};
path.pop();
path.push(arg);
path
} else {
arg
}
}