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use ast;
use syntax_pos::{self, Pos, Span};
use ext::base::*;
use ext::base;
use ext::build::AstBuilder;
use parse::{token, DirectoryOwnership};
use parse;
use print::pprust;
use ptr::P;
use symbol::Symbol;
use tokenstream;
use util::small_vector::SmallVector;
use std::fs::File;
use std::io::prelude::*;
use std::path::{Path, PathBuf};
use std::rc::Rc;
pub fn expand_line(cx: &mut ExtCtxt, sp: Span, tts: &[tokenstream::TokenTree])
-> Box<base::MacResult+'static> {
base::check_zero_tts(cx, sp, tts, "line!");
let topmost = cx.expansion_cause().unwrap_or(sp);
let loc = cx.codemap().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<base::MacResult+'static> {
base::check_zero_tts(cx, sp, tts, "column!");
let topmost = cx.expansion_cause().unwrap_or(sp);
let loc = cx.codemap().lookup_char_pos(topmost.lo);
base::MacEager::expr(cx.expr_u32(topmost, loc.col.to_usize() as u32))
}
pub fn expand_file(cx: &mut ExtCtxt, sp: Span, tts: &[tokenstream::TokenTree])
-> Box<base::MacResult+'static> {
base::check_zero_tts(cx, sp, tts, "file!");
let topmost = cx.expansion_cause().unwrap_or(sp);
let loc = cx.codemap().lookup_char_pos(topmost.lo);
base::MacEager::expr(cx.expr_str(topmost, Symbol::intern(&loc.file.name)))
}
pub fn expand_stringify(cx: &mut ExtCtxt, sp: Span, tts: &[tokenstream::TokenTree])
-> Box<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<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<base::MacResult+'cx> {
let file = match get_single_str_from_tts(cx, sp, tts, "include!") {
Some(f) => f,
None => return DummyResult::expr(sp),
};
let path = res_rel_file(cx, sp, Path::new(&file));
let directory_ownership = DirectoryOwnership::Owned;
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<SmallVector<P<ast::Item>>> {
let mut ret = SmallVector::new();
while self.p.token != token::Eof {
match panictry!(self.p.parse_item()) {
Some(item) => ret.push(item),
None => panic!(self.p.diagnostic().span_fatal(self.p.span,
&format!("expected item, found `{}`",
self.p.this_token_to_string())))
}
}
Some(ret)
}
}
Box::new(ExpandResult { p: p })
}
pub fn expand_include_str(cx: &mut ExtCtxt, sp: Span, tts: &[tokenstream::TokenTree])
-> Box<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, Path::new(&file));
let mut bytes = Vec::new();
match File::open(&file).and_then(|mut f| f.read_to_end(&mut bytes)) {
Ok(..) => {}
Err(e) => {
cx.span_err(sp,
&format!("couldn't read {}: {}",
file.display(),
e));
return DummyResult::expr(sp);
}
};
match String::from_utf8(bytes) {
Ok(src) => {
let filename = format!("{}", file.display());
cx.codemap().new_filemap_and_lines(&filename, &src);
base::MacEager::expr(cx.expr_str(sp, Symbol::intern(&src)))
}
Err(_) => {
cx.span_err(sp,
&format!("{} wasn't a utf-8 file",
file.display()));
DummyResult::expr(sp)
}
}
}
pub fn expand_include_bytes(cx: &mut ExtCtxt, sp: Span, tts: &[tokenstream::TokenTree])
-> Box<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, Path::new(&file));
let mut bytes = Vec::new();
match File::open(&file).and_then(|mut f| f.read_to_end(&mut bytes)) {
Err(e) => {
cx.span_err(sp,
&format!("couldn't read {}: {}", file.display(), e));
DummyResult::expr(sp)
}
Ok(..) => {
let filename = format!("{}", file.display());
cx.codemap().new_filemap_and_lines(&filename, "");
base::MacEager::expr(cx.expr_lit(sp, ast::LitKind::ByteStr(Rc::new(bytes))))
}
}
}
fn res_rel_file(cx: &mut ExtCtxt, sp: syntax_pos::Span, arg: &Path) -> PathBuf {
if !arg.is_absolute() {
let callsite = sp.source_callsite();
let mut cu = PathBuf::from(&cx.codemap().span_to_filename(callsite));
cu.pop();
cu.push(arg);
cu
} else {
arg.to_path_buf()
}
}