113 lines
4.2 KiB
Rust
113 lines
4.2 KiB
Rust
// Copyright 2012-2014 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 self::WhichLine::*;
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use std::fs::File;
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use std::io::BufReader;
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use std::io::prelude::*;
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use std::path::Path;
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pub struct ExpectedError {
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pub line: usize,
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pub kind: String,
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pub msg: String,
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}
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#[derive(PartialEq, Debug)]
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enum WhichLine { ThisLine, FollowPrevious(usize), AdjustBackward(usize) }
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/// Looks for either "//~| KIND MESSAGE" or "//~^^... KIND MESSAGE"
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/// The former is a "follow" that inherits its target from the preceding line;
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/// the latter is an "adjusts" that goes that many lines up.
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///
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/// Goal is to enable tests both like: //~^^^ ERROR go up three
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/// and also //~^ ERROR message one for the preceding line, and
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/// //~| ERROR message two for that same line.
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///
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/// If cfg is not None (i.e., in an incremental test), then we look
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/// for `//[X]~` instead, where `X` is the current `cfg`.
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pub fn load_errors(testfile: &Path, cfg: Option<&str>) -> Vec<ExpectedError> {
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let rdr = BufReader::new(File::open(testfile).unwrap());
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// `last_nonfollow_error` tracks the most recently seen
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// line with an error template that did not use the
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// follow-syntax, "//~| ...".
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//
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// (pnkfelix could not find an easy way to compose Iterator::scan
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// and Iterator::filter_map to pass along this information into
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// `parse_expected`. So instead I am storing that state here and
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// updating it in the map callback below.)
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let mut last_nonfollow_error = None;
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let tag = match cfg {
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Some(rev) => format!("//[{}]~", rev),
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None => format!("//~")
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};
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rdr.lines()
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.enumerate()
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.filter_map(|(line_no, ln)| {
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parse_expected(last_nonfollow_error,
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line_no + 1,
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&ln.unwrap(),
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&tag)
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.map(|(which, error)| {
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match which {
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FollowPrevious(_) => {}
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_ => last_nonfollow_error = Some(error.line),
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}
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error
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})
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})
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.collect()
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}
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fn parse_expected(last_nonfollow_error: Option<usize>,
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line_num: usize,
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line: &str,
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tag: &str)
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-> Option<(WhichLine, ExpectedError)> {
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let start = match line.find(tag) { Some(i) => i, None => return None };
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let (follow, adjusts) = if line.char_at(start + tag.len()) == '|' {
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(true, 0)
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} else {
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(false, line[start + tag.len()..].chars().take_while(|c| *c == '^').count())
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};
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let kind_start = start + tag.len() + adjusts + (follow as usize);
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let letters = line[kind_start..].chars();
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let kind = letters.skip_while(|c| c.is_whitespace())
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.take_while(|c| !c.is_whitespace())
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.flat_map(|c| c.to_lowercase())
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.collect::<String>();
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let letters = line[kind_start..].chars();
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let msg = letters.skip_while(|c| c.is_whitespace())
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.skip_while(|c| !c.is_whitespace())
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.collect::<String>().trim().to_owned();
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let (which, line) = if follow {
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assert!(adjusts == 0, "use either //~| or //~^, not both.");
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let line = last_nonfollow_error.unwrap_or_else(|| {
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panic!("encountered //~| without preceding //~^ line.")
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});
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(FollowPrevious(line), line)
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} else {
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let which =
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if adjusts > 0 { AdjustBackward(adjusts) } else { ThisLine };
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let line = line_num - adjusts;
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(which, line)
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};
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debug!("line={} tag={:?} which={:?} kind={:?} msg={:?}",
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line_num, tag, which, kind, msg);
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Some((which, ExpectedError { line: line,
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kind: kind,
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msg: msg, }))
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}
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