Auto merge of #21458 - alexcrichton:remove-some-code, r=brson

The base64 support can be trivially removed (there are no in-tree users) and the regex support is a whopping 4k lines of code to maintain for a few non-critical uses in-tree. This commit migrates all current users in-tree away from regexes to custom matching code.

The most critical application affected by this migration is that the testing framework no longer considers filter arguments as regexes, but rather just a substring matching. It is expected that more featureful testing frameworks can evolve outside of the in-tree libtest version over time which can properly depend on libregex from crates.io.

[breaking-change]

1 files changed, 38 insertions, 35 deletions

diff --git a/src/compiletest/errors.rs b/src/compiletest/errors.rs
index dcfac688c7f..fc815d66a4d 100644
--- a/src/compiletest/errors.rs
+++ b/src/compiletest/errors.rs
@@ -9,9 +9,7 @@
 // except according to those terms.
 use self::WhichLine::*;
 
-use std::ascii::AsciiExt;
 use std::io::{BufferedReader, File};
-use regex::Regex;
 
 pub struct ExpectedError {
     pub line: uint,
@@ -19,6 +17,9 @@ pub struct ExpectedError {
     pub msg: String,
 }
 
+#[derive(PartialEq, Show)]
+enum WhichLine { ThisLine, FollowPrevious(uint), AdjustBackward(uint) }
+
 /// Looks for either "//~| KIND MESSAGE" or "//~^^... KIND MESSAGE"
 /// The former is a "follow" that inherits its target from the preceding line;
 /// the latter is an "adjusts" that goes that many lines up.
@@ -26,15 +27,8 @@ pub struct ExpectedError {
 /// Goal is to enable tests both like: //~^^^ ERROR go up three
 /// and also //~^ ERROR message one for the preceding line, and
 ///          //~| ERROR message two for that same line.
-
-pub static EXPECTED_PATTERN : &'static str =
-    r"//~(?P<follow>\|)?(?P<adjusts>\^*)\s*(?P<kind>\S*)\s*(?P<msg>.*)";
-
-#[derive(PartialEq, Show)]
-enum WhichLine { ThisLine, FollowPrevious(uint), AdjustBackward(uint) }
-
 // Load any test directives embedded in the file
-pub fn load_errors(re: &Regex, testfile: &Path) -> Vec<ExpectedError> {
+pub fn load_errors(testfile: &Path) -> Vec<ExpectedError> {
     let mut rdr = BufferedReader::new(File::open(testfile).unwrap());
 
     // `last_nonfollow_error` tracks the most recently seen
@@ -50,7 +44,7 @@ pub fn load_errors(re: &Regex, testfile: &Path) -> Vec<ExpectedError> {
     rdr.lines().enumerate().filter_map(|(line_no, ln)| {
         parse_expected(last_nonfollow_error,
                        line_no + 1,
-                       ln.unwrap().as_slice(), re)
+                       ln.unwrap().as_slice())
             .map(|(which, error)| {
                 match which {
                     FollowPrevious(_) => {}
@@ -63,30 +57,39 @@ pub fn load_errors(re: &Regex, testfile: &Path) -> Vec<ExpectedError> {
 
 fn parse_expected(last_nonfollow_error: Option<uint>,
                   line_num: uint,
-                  line: &str,
-                  re: &Regex) -> Option<(WhichLine, ExpectedError)> {
-    re.captures(line).and_then(|caps| {
-        let adjusts = caps.name("adjusts").unwrap_or("").len();
-        let kind = caps.name("kind").unwrap_or("").to_ascii_lowercase();
-        let msg = caps.name("msg").unwrap_or("").trim().to_string();
-        let follow = caps.name("follow").unwrap_or("").len() > 0;
+                  line: &str) -> Option<(WhichLine, ExpectedError)> {
+    let start = match line.find_str("//~") { Some(i) => i, None => return None };
+    let (follow, adjusts) = if line.char_at(start + 3) == '|' {
+        (true, 0)
+    } else {
+        (false, line[start + 3..].chars().take_while(|c| *c == '^').count())
+    };
+    let kind_start = start + 3 + adjusts + (follow as usize);
+    let letters = line[kind_start..].chars();
+    let kind = letters.skip_while(|c| c.is_whitespace())
+                      .take_while(|c| !c.is_whitespace())
+                      .map(|c| c.to_lowercase())
+                      .collect::<String>();
+    let letters = line[kind_start..].chars();
+    let msg = letters.skip_while(|c| c.is_whitespace())
+                     .skip_while(|c| !c.is_whitespace())
+                     .collect::<String>().trim().to_string();
 
-        let (which, line) = if follow {
-            assert!(adjusts == 0, "use either //~| or //~^, not both.");
-            let line = last_nonfollow_error.unwrap_or_else(|| {
-                panic!("encountered //~| without preceding //~^ line.")
-            });
-            (FollowPrevious(line), line)
-        } else {
-            let which =
-                if adjusts > 0 { AdjustBackward(adjusts) } else { ThisLine };
-            let line = line_num - adjusts;
-            (which, line)
-        };
+    let (which, line) = if follow {
+        assert!(adjusts == 0, "use either //~| or //~^, not both.");
+        let line = last_nonfollow_error.unwrap_or_else(|| {
+            panic!("encountered //~| without preceding //~^ line.")
+        });
+        (FollowPrevious(line), line)
+    } else {
+        let which =
+            if adjusts > 0 { AdjustBackward(adjusts) } else { ThisLine };
+        let line = line_num - adjusts;
+        (which, line)
+    };
 
-        debug!("line={} which={:?} kind={:?} msg={:?}", line_num, which, kind, msg);
-        Some((which, ExpectedError { line: line,
-                                     kind: kind,
-                                     msg: msg, }))
-    })
+    debug!("line={} which={:?} kind={:?} msg={:?}", line_num, which, kind, msg);
+    Some((which, ExpectedError { line: line,
+                                 kind: kind,
+                                 msg: msg, }))
 }