auto merge of #8906 : novalis/rust/master, r=alexcrichton

This is a patch to fix #6031.  I didn't see any tests for the C++ library code, so I didn't write a test for my changes.  Did I miss something, or are there really no tests?

Author: bors

doc/rust.md

@@ -3385,9 +3385,11 @@ The path to a module consists of the crate name, any parent modules,
 then the module itself, all separated by double colons (`::`).  The
 optional log level can be appended to the module path with an equals
 sign (`=`) followed by the log level, from 1 to 4, inclusive. Level 1
-is the error level, 2 is warning, 3 info, and 4 debug. Any logs
-less than or equal to the specified level will be output. If not
-specified then log level 4 is assumed.
+is the error level, 2 is warning, 3 info, and 4 debug. You can also
+use the symbolic constants `error`, `warn`, `info`, and `debug`.  Any
+logs less than or equal to the specified level will be output. If not
+specified then log level 4 is assumed.  However, debug messages are
+only available if `--cfg=debug` is passed to `rustc`.
 
 As an example, to see all the logs generated by the compiler, you would set
 `RUST_LOG` to `rustc`, which is the crate name (as specified in its `link`

src/libstd/rt/logging.rs

@@ -10,7 +10,7 @@
 use cast::transmute;
 use either::*;
 use libc::{c_void, uintptr_t, c_char, exit, STDERR_FILENO};
-use option::{Some, None};
+use option::{Some, None, Option};
 use rt::util::dumb_println;
 use str::StrSlice;
 use str::raw::from_c_str;
@@ -20,7 +20,7 @@ use vec::ImmutableVector;
 
 
 struct LogDirective {
-    name: ~str,
+    name: Option<~str>,
     level: u32
 }
 
@@ -30,7 +30,6 @@ struct ModEntry{
     log_level: *mut u32
 }
 
-static MAX_LOG_DIRECTIVES: u32 = 255;
 static MAX_LOG_LEVEL: u32 = 255;
 static DEFAULT_LOG_LEVEL: u32 = 1;
 
@@ -68,42 +67,82 @@ fn iter_crate_map(map: *u8, f: &fn(*mut ModEntry)) {
                     data: *c_void);
     }
 }
+static log_level_names : &'static[&'static str] = &'static["error", "warn", "info", "debug"];
+
+/// Parse an individual log level that is either a number or a symbolic log level
+fn parse_log_level(level: &str) -> Option<u32> {
+    let num = u32::from_str(level);
+    let mut log_level;
+    match num {
+        Some(num) => {
+            if num < MAX_LOG_LEVEL {
+                log_level = Some(num);
+            } else {
+                log_level = Some(MAX_LOG_LEVEL);
+            }
+        }
+        _ => {
+            let position = log_level_names.iter().position(|&name| name == level);
+            match position {
+                Some(position) => {
+                    log_level = Some(u32::min(MAX_LOG_LEVEL, (position + 1) as u32))
+                },
+                _ => {
+                    log_level = None;
+                }
+            }
+        }
+    }
+    log_level
+}
+
 
 /// Parse a logging specification string (e.g: "crate1,crate2::mod3,crate3::x=1")
 /// and return a vector with log directives.
-/// Valid log levels are 0-255, with the most likely ones being 0-3 (defined in std::).
+/// Valid log levels are 0-255, with the most likely ones being 1-4 (defined in std::).
+/// Also supports string log levels of error, warn, info, and debug
+
 fn parse_logging_spec(spec: ~str) -> ~[LogDirective]{
     let mut dirs = ~[];
     for s in spec.split_iter(',') {
         let parts: ~[&str] = s.split_iter('=').collect();
-        let mut loglevel;
+        let mut log_level;
+        let mut name = Some(parts[0].to_owned());
         match parts.len() {
-            1 => loglevel = MAX_LOG_LEVEL,
-            2 => {
-                let num = u32::from_str(parts[1]);
-                match (num) {
+            1 => {
+                //if the single argument is a log-level string or number,
+                //treat that as a global fallback
+                let possible_log_level = parse_log_level(parts[0]);
+                match possible_log_level {
                     Some(num) => {
-                        if num < MAX_LOG_LEVEL {
-                            loglevel = num;
-                        } else {
-                            loglevel = MAX_LOG_LEVEL;
-                        }
+                        name = None;
+                        log_level = num;
+                    },
+                    _ => {
+                        log_level = MAX_LOG_LEVEL
                     }
+                }
+            }
+            2 => {
+                let possible_log_level = parse_log_level(parts[1]);
+                match possible_log_level {
+                    Some(num) => {
+                        log_level = num;
+                    },
                     _ => {
-                         dumb_println(fmt!("warning: invalid logging spec \
-                                           '%s', ignoring it", s));
-                         loop;
+                        dumb_println(fmt!("warning: invalid logging spec \
+                                           '%s', ignoring it", parts[1]));
+                        loop;
                     }
                 }
-                if loglevel > MAX_LOG_LEVEL { loglevel = MAX_LOG_LEVEL}
             },
             _ => {
                 dumb_println(fmt!("warning: invalid logging spec '%s',\
                                   ignoring it", s));
                 loop;
             }
         }
-        let dir = LogDirective {name: parts[0].to_owned(), level: loglevel};
+        let dir = LogDirective {name: name, level: log_level};
         dirs.push(dir);
     }
     return dirs;
@@ -113,18 +152,30 @@ fn parse_logging_spec(spec: ~str) -> ~[LogDirective]{
 /// of log directives
 fn update_entry(dirs: &[LogDirective], entry: *mut ModEntry) -> u32 {
     let mut new_lvl: u32 = DEFAULT_LOG_LEVEL;
-    let mut longest_match = 0;
+    let mut longest_match = -1i;
     unsafe {
         for dir in dirs.iter() {
-            let name = from_c_str((*entry).name);
-            if name.starts_with(dir.name) && dir.name.len() > longest_match {
-                longest_match = dir.name.len();
-                new_lvl = dir.level;
-            }
+            match dir.name {
+                None => {
+                    if longest_match == -1 {
+                        longest_match = 0;
+                        new_lvl = dir.level;
+                    }
+                }
+                Some(ref dir_name) => {
+                    let name = from_c_str((*entry).name);
+                    let len = dir_name.len() as int;
+                    if name.starts_with(*dir_name) &&
+                        len >= longest_match {
+                        longest_match = len;
+                        new_lvl = dir.level;
+                    }
+                }
+            };
         }
         *(*entry).log_level = new_lvl;
     }
-    if longest_match > 0 { return 1; } else { return 0; }
+    if longest_match >= 0 { return 1; } else { return 0; }
 }
 
 #[fixed_stack_segment] #[inline(never)]
@@ -238,45 +289,66 @@ extern {
 // Tests for parse_logging_spec()
 #[test]
 fn parse_logging_spec_valid() {
-    let dirs: ~[LogDirective] = parse_logging_spec(~"crate1::mod1=1,crate1::mod2,crate2=4");
+    let dirs = parse_logging_spec(~"crate1::mod1=1,crate1::mod2,crate2=4");
     assert_eq!(dirs.len(), 3);
-    assert!(dirs[0].name == ~"crate1::mod1");
+    assert!(dirs[0].name == Some(~"crate1::mod1"));
     assert_eq!(dirs[0].level, 1);
 
-    assert!(dirs[1].name == ~"crate1::mod2");
+    assert!(dirs[1].name == Some(~"crate1::mod2"));
     assert_eq!(dirs[1].level, MAX_LOG_LEVEL);
 
-    assert!(dirs[2].name == ~"crate2");
+    assert!(dirs[2].name == Some(~"crate2"));
     assert_eq!(dirs[2].level, 4);
 }
 
 #[test]
 fn parse_logging_spec_invalid_crate() {
     // test parse_logging_spec with multiple = in specification
-    let dirs: ~[LogDirective] = parse_logging_spec(~"crate1::mod1=1=2,crate2=4");
+    let dirs = parse_logging_spec(~"crate1::mod1=1=2,crate2=4");
     assert_eq!(dirs.len(), 1);
-    assert!(dirs[0].name == ~"crate2");
+    assert!(dirs[0].name == Some(~"crate2"));
     assert_eq!(dirs[0].level, 4);
 }
 
 #[test]
 fn parse_logging_spec_invalid_log_level() {
     // test parse_logging_spec with 'noNumber' as log level
-    let dirs: ~[LogDirective] = parse_logging_spec(~"crate1::mod1=noNumber,crate2=4");
+    let dirs = parse_logging_spec(~"crate1::mod1=noNumber,crate2=4");
     assert_eq!(dirs.len(), 1);
-    assert!(dirs[0].name == ~"crate2");
+    assert!(dirs[0].name == Some(~"crate2"));
     assert_eq!(dirs[0].level, 4);
 }
 
+#[test]
+fn parse_logging_spec_string_log_level() {
+    // test parse_logging_spec with 'warn' as log level
+    let dirs = parse_logging_spec(~"crate1::mod1=wrong,crate2=warn");
+    assert_eq!(dirs.len(), 1);
+    assert!(dirs[0].name == Some(~"crate2"));
+    assert_eq!(dirs[0].level, 2);
+}
+
+#[test]
+fn parse_logging_spec_global() {
+    // test parse_logging_spec with no crate
+    let dirs = parse_logging_spec(~"warn,crate2=4");
+    assert_eq!(dirs.len(), 2);
+    assert!(dirs[0].name == None);
+    assert_eq!(dirs[0].level, 2);
+    assert!(dirs[1].name == Some(~"crate2"));
+    assert_eq!(dirs[1].level, 4);
+}
+
 // Tests for update_entry
 #[test]
 fn update_entry_match_full_path() {
     use c_str::ToCStr;
-    let dirs = ~[LogDirective {name: ~"crate1::mod1", level: 2 },
-    LogDirective {name: ~"crate2", level: 3}];
+    let dirs = ~[LogDirective {name: Some(~"crate1::mod1"), level: 2 },
+                 LogDirective {name: Some(~"crate2"), level: 3}];
+    let level = &mut 0;
     unsafe {
         do "crate1::mod1".to_c_str().with_ref |ptr| {
-            let entry= &ModEntry {name: ptr, log_level: &mut 0};
+            let entry= &ModEntry {name: ptr, log_level: level};
             let m = update_entry(dirs, transmute(entry));
             assert!(*entry.log_level == 2);
             assert!(m == 1);
@@ -287,11 +359,12 @@ fn update_entry_match_full_path() {
 #[test]
 fn update_entry_no_match() {
     use c_str::ToCStr;
-    let dirs = ~[LogDirective {name: ~"crate1::mod1", level: 2 },
-        LogDirective {name: ~"crate2", level: 3}];
+    let dirs = ~[LogDirective {name: Some(~"crate1::mod1"), level: 2 },
+                 LogDirective {name: Some(~"crate2"), level: 3}];
+    let level = &mut 0;
     unsafe {
         do "crate3::mod1".to_c_str().with_ref |ptr| {
-            let entry= &ModEntry {name: ptr, log_level: &mut 0};
+            let entry= &ModEntry {name: ptr, log_level: level};
             let m = update_entry(dirs, transmute(entry));
             assert!(*entry.log_level == DEFAULT_LOG_LEVEL);
             assert!(m == 0);
@@ -302,11 +375,12 @@ fn update_entry_no_match() {
 #[test]
 fn update_entry_match_beginning() {
     use c_str::ToCStr;
-    let dirs = ~[LogDirective {name: ~"crate1::mod1", level: 2 },
-        LogDirective {name: ~"crate2", level: 3}];
+    let dirs = ~[LogDirective {name: Some(~"crate1::mod1"), level: 2 },
+                 LogDirective {name: Some(~"crate2"), level: 3}];
+    let level = &mut 0;
     unsafe {
         do "crate2::mod1".to_c_str().with_ref |ptr| {
-            let entry= &ModEntry {name: ptr, log_level: &mut 0};
+            let entry= &ModEntry {name: ptr, log_level: level};
             let m = update_entry(dirs, transmute(entry));
             assert!(*entry.log_level == 3);
             assert!(m == 1);
@@ -317,14 +391,39 @@ fn update_entry_match_beginning() {
 #[test]
 fn update_entry_match_beginning_longest_match() {
     use c_str::ToCStr;
-    let dirs = ~[LogDirective {name: ~"crate1::mod1", level: 2 },
-        LogDirective {name: ~"crate2", level: 3}, LogDirective {name: ~"crate2::mod", level: 4}];
+    let dirs = ~[LogDirective {name: Some(~"crate1::mod1"), level: 2 },
+                 LogDirective {name: Some(~"crate2"), level: 3},
+                 LogDirective {name: Some(~"crate2::mod"), level: 4}];
+    let level = &mut 0;
     unsafe {
         do "crate2::mod1".to_c_str().with_ref |ptr| {
-            let entry = &ModEntry {name: ptr, log_level: &mut 0};
+            let entry = &ModEntry {name: ptr, log_level: level};
             let m = update_entry(dirs, transmute(entry));
             assert!(*entry.log_level == 4);
             assert!(m == 1);
         }
     }
 }
+
+#[test]
+fn update_entry_match_default() {
+    use c_str::ToCStr;
+    let dirs = ~[LogDirective {name: Some(~"crate1::mod1"), level: 2 },
+                 LogDirective {name: None, level: 3}
+                ];
+    let level = &mut 0;
+    unsafe {
+        do "crate1::mod1".to_c_str().with_ref |ptr| {
+            let entry= &ModEntry {name: ptr, log_level: level};
+            let m = update_entry(dirs, transmute(entry));
+            assert!(*entry.log_level == 2);
+            assert!(m == 1);
+        }
+        do "crate2::mod2".to_c_str().with_ref |ptr| {
+            let entry= &ModEntry {name: ptr, log_level: level};
+            let m = update_entry(dirs, transmute(entry));
+            assert!(*entry.log_level == 3);
+            assert!(m == 1);
+        }
+    }
+}