src/test/run-make/unicode-input/span_length.rs

   1 // Copyright 2014 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 use std::old_io::{File, Command};
  12 use std::iter::repeat;
  13 use std::rand::{thread_rng, Rng};
  14 use std::{char, os};
  15
  16 // creates a file with `fn main() { <random ident> }` and checks the
  17 // compiler emits a span of the appropriate length (for the
  18 // "unresolved name" message); currently just using the number of code
  19 // points, but should be the number of graphemes (FIXME #7043)
  20
  21 fn random_char() -> char {
  22     let mut rng = thread_rng();
  23     // a subset of the XID_start Unicode table (ensuring that the
  24     // compiler doesn't fail with an "unrecognised token" error)
  25     let (lo, hi): (u32, u32) = match rng.gen_range(1u32, 4u32 + 1) {
  26         1 => (0x41, 0x5a),
  27         2 => (0xf8, 0x1ba),
  28         3 => (0x1401, 0x166c),
  29         _ => (0x10400, 0x1044f)
  30     };
  31
  32     char::from_u32(rng.gen_range(lo, hi + 1)).unwrap()
  33 }
  34
  35 fn main() {
  36     let args = os::args();
  37     let rustc = &args[1];
  38     let tmpdir = Path::new(&args[2]);
  39     let main_file = tmpdir.join("span_main.rs");
  40
  41     for _ in 0u..100 {
  42         let n = thread_rng().gen_range(3u, 20);
  43
  44         {
  45             let _ = write!(&mut File::create(&main_file).unwrap(),
  46                            "#![feature(non_ascii_idents)] fn main() {{ {} }}",
  47                            // random string of length n
  48                            (0..n).map(|_| random_char()).collect::<String>());
  49         }
  50
  51         // rustc is passed to us with --out-dir and -L etc., so we
  52         // can't exec it directly
  53         let result = Command::new("sh")
  54                              .arg("-c")
  55                              .arg(&format!("{} {}",
  56                                            rustc,
  57                                            main_file.as_str()
  58                                                     .unwrap()))
  59                              .output().unwrap();
  60
  61         let err = String::from_utf8_lossy(&result.error);
  62
  63         // the span should end the line (e.g no extra ~'s)
  64         let expected_span = format!("^{}\n", repeat("~").take(n - 1)
  65                                                         .collect::<String>());
  66         assert!(err.contains(&expected_span));
  67     }
  68
  69     // Test multi-column characters and tabs
  70     {
  71         let _ = write!(&mut File::create(&main_file).unwrap(),
  72                        r#"extern "路濫狼á́́" fn foo() {{}} extern "路濫狼á́" fn bar() {{}}"#);
  73     }
  74
  75     // Extra characters. Every line is preceded by `filename:lineno <actual code>`
  76     let offset = main_file.as_str().unwrap().len() + 3;
  77
  78     let result = Command::new("sh")
  79                          .arg("-c")
  80                          .arg(format!("{} {}",
  81                                       rustc,
  82                                       main_file.as_str()
  83                                                .unwrap()).as_slice())
  84                          .output().unwrap();
  85
  86     let err = String::from_utf8_lossy(result.error.as_slice());
  87
  88     // Test both the length of the snake and the leading spaces up to it
  89
  90     // First snake is 8 ~s long, with 7 preceding spaces (excluding file name/line offset)
  91     let expected_span = format!("\n{}^{}\n",
  92                                 repeat(" ").take(offset + 7).collect::<String>(),
  93                                 repeat("~").take(8).collect::<String>());
  94     assert!(err.contains(expected_span.as_slice()));
  95     // Second snake is 8 ~s long, with 36 preceding spaces
  96     let expected_span = format!("\n{}^{}\n",
  97                                 repeat(" ").take(offset + 36).collect::<String>(),
  98                                 repeat("~").take(8).collect::<String>());
  99     assert!(err.contains(expected_span.as_slice()));
 100 }