Convert rust_log.cpp to Rust, closes #8703

1 files changed, 248 insertions, 15 deletions

diff --git a/src/libstd/rt/logging.rs b/src/libstd/rt/logging.rs
index e716549d1e6..bcd8ef98d28 100644
--- a/src/libstd/rt/logging.rs
+++ b/src/libstd/rt/logging.rs
@@ -7,10 +7,159 @@
 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
-
+use cast::transmute;
 use either::*;
-use libc;
+use libc::{c_void, uintptr_t, c_char, exit, STDERR_FILENO};
+use option::{Some, None};
+use rt::util::dumb_println;
 use str::StrSlice;
+use str::raw::from_c_str;
+use u32;
+use unstable::raw::Closure;
+use vec::ImmutableVector;
+
+
+struct LogDirective {
+    name: ~str,
+    level: u32
+}
+
+// This is the Rust representation of the mod_entry struct in src/rt/rust_crate_map.h
+struct ModEntry{
+    name: *c_char,
+    log_level: *mut u32
+}
+
+static MAX_LOG_DIRECTIVES: u32 = 255;
+static MAX_LOG_LEVEL: u32 = 255;
+static DEFAULT_LOG_LEVEL: u32 = 1;
+
+fn iter_crate_map(map: *u8, f: &fn(*mut ModEntry)) {
+    unsafe {
+        let closure : Closure = transmute(f);
+        let code = transmute(closure.code);
+        let env = transmute(closure.env);
+        rust_iter_crate_map(transmute(map), iter_cb, code, env);
+    }
+
+    extern fn iter_cb(code: *c_void, env: *c_void, entry: *ModEntry){
+         unsafe {
+            let closure: Closure = Closure {
+                code: transmute(code),
+                env: transmute(env),
+            };
+            let closure: &fn(*ModEntry) = transmute(closure);
+            return closure(entry);
+        }
+    }
+    extern {
+        #[cfg(not(stage0))]
+        #[rust_stack]
+        fn rust_iter_crate_map(map: *c_void,
+                    f: extern "C" fn(*c_void, *c_void, entry: *ModEntry),
+                    code: *c_void,
+                    data: *c_void);
+
+        #[cfg(stage0)]
+        #[rust_stack]
+        fn rust_iter_crate_map(map: *c_void,
+                    f: *u8,
+                    code: *c_void,
+                    data: *c_void);
+    }
+}
+
+/// 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::).
+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;
+        match parts.len() {
+            1 => loglevel = MAX_LOG_LEVEL,
+            2 => {
+                let num = u32::from_str(parts[1]);
+                match (num) {
+                    Some(num) => {
+                        if num < MAX_LOG_LEVEL {
+                            loglevel = num;
+                        } else {
+                            loglevel = MAX_LOG_LEVEL;
+                        }
+                    }
+                    _ => {
+                         dumb_println(fmt!("warning: invalid logging spec \
+                                           '%s', ignoring it", s));
+                         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};
+        dirs.push(dir);
+    }
+    return dirs;
+}
+
+/// Set the log level of an entry in the crate map depending on the vector
+/// 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;
+    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;
+            }
+        }
+        *(*entry).log_level = new_lvl;
+    }
+    if longest_match > 0 { return 1; } else { return 0; }
+}
+
+#[fixed_stack_segment] #[inline(never)]
+/// Set log level for every entry in crate_map according to the sepecification
+/// in settings
+fn update_log_settings(crate_map: *u8, settings: ~str) {
+    let mut dirs = ~[];
+    if settings.len() > 0 {
+        if settings == ~"::help" || settings == ~"?" {
+            dumb_println("\nCrate log map:\n");
+            do iter_crate_map(crate_map) |entry: *mut ModEntry| {
+                unsafe {
+                    dumb_println(" "+from_c_str((*entry).name));
+                }
+            }
+            unsafe {
+                exit(1);
+            }
+        }
+        dirs = parse_logging_spec(settings);
+    }
+
+    let mut n_matches: u32 = 0;
+    do iter_crate_map(crate_map) |entry: *mut ModEntry| {
+        let m = update_entry(dirs, entry);
+        n_matches += m;
+    }
+
+    if n_matches < (dirs.len() as u32) {
+        dumb_println(fmt!("warning: got %u RUST_LOG specs but only matched %u of them.\n\
+                          You may have mistyped a RUST_LOG spec.\n\
+                          Use RUST_LOG=::help to see the list of crates and modules.\n",
+                          dirs.len() as uint, n_matches as uint));
+    }
+}
 
 pub trait Logger {
     fn log(&mut self, msg: Either<~str, &'static str>);
@@ -47,34 +196,26 @@ impl Logger for StdErrLogger {
         };
 
         fn print(s: &str) {
-            let dbg = ::libc::STDERR_FILENO as ::io::fd_t;
+            let dbg = STDERR_FILENO as ::io::fd_t;
             dbg.write_str(s);
             dbg.write_str("\n");
             dbg.flush();
         }
     }
 }
-
 /// Configure logging by traversing the crate map and setting the
 /// per-module global logging flags based on the logging spec
 #[fixed_stack_segment] #[inline(never)]
 pub fn init(crate_map: *u8) {
-    use c_str::ToCStr;
     use os;
-    use ptr;
-    use option::{Some, None};
 
     let log_spec = os::getenv("RUST_LOG");
     match log_spec {
         Some(spec) => {
-            do spec.with_c_str |buf| {
-                unsafe { rust_update_log_settings(crate_map, buf) }
-            }
+            update_log_settings(crate_map, spec);
         }
         None => {
-            unsafe {
-                rust_update_log_settings(crate_map, ptr::null());
-            }
+            update_log_settings(crate_map, ~"");
         }
     }
 }
@@ -89,9 +230,101 @@ pub fn console_off() { unsafe { rust_log_console_off() } }
 fn should_log_console() -> bool { unsafe { rust_should_log_console() != 0 } }
 
 extern {
-    fn rust_update_log_settings(crate_map: *u8, settings: *libc::c_char);
     fn rust_log_console_on();
     fn rust_log_console_off();
-    fn rust_should_log_console() -> libc::uintptr_t;
+    fn rust_should_log_console() -> uintptr_t;
+}
+
+// Tests for parse_logging_spec()
+#[test]
+fn parse_logging_spec_valid() {
+    let dirs: ~[LogDirective] = parse_logging_spec(~"crate1::mod1=1,crate1::mod2,crate2=4");
+    assert_eq!(dirs.len(), 3);
+    assert!(dirs[0].name == ~"crate1::mod1");
+    assert_eq!(dirs[0].level, 1);
+
+    assert!(dirs[1].name == ~"crate1::mod2");
+    assert_eq!(dirs[1].level, MAX_LOG_LEVEL);
+
+    assert!(dirs[2].name == ~"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");
+    assert_eq!(dirs.len(), 1);
+    assert!(dirs[0].name == ~"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");
+    assert_eq!(dirs.len(), 1);
+    assert!(dirs[0].name == ~"crate2");
+    assert_eq!(dirs[0].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}];
+    unsafe {
+        do "crate1::mod1".to_c_str().with_ref |ptr| {
+            let entry= &ModEntry {name: ptr, log_level: &mut 0};
+            let m = update_entry(dirs, transmute(entry));
+            assert!(*entry.log_level == 2);
+            assert!(m == 1);
+        }
+    }
 }
 
+#[test]
+fn update_entry_no_match() {
+    use c_str::ToCStr;
+    let dirs = ~[LogDirective {name: ~"crate1::mod1", level: 2 },
+        LogDirective {name: ~"crate2", level: 3}];
+    unsafe {
+        do "crate3::mod1".to_c_str().with_ref |ptr| {
+            let entry= &ModEntry {name: ptr, log_level: &mut 0};
+            let m = update_entry(dirs, transmute(entry));
+            assert!(*entry.log_level == DEFAULT_LOG_LEVEL);
+            assert!(m == 0);
+        }
+    }
+}
+
+#[test]
+fn update_entry_match_beginning() {
+    use c_str::ToCStr;
+    let dirs = ~[LogDirective {name: ~"crate1::mod1", level: 2 },
+        LogDirective {name: ~"crate2", level: 3}];
+    unsafe {
+        do "crate2::mod1".to_c_str().with_ref |ptr| {
+            let entry= &ModEntry {name: ptr, log_level: &mut 0};
+            let m = update_entry(dirs, transmute(entry));
+            assert!(*entry.log_level == 3);
+            assert!(m == 1);
+        }
+    }
+}
+
+#[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}];
+    unsafe {
+        do "crate2::mod1".to_c_str().with_ref |ptr| {
+            let entry = &ModEntry {name: ptr, log_level: &mut 0};
+            let m = update_entry(dirs, transmute(entry));
+            assert!(*entry.log_level == 4);
+            assert!(m == 1);
+        }
+    }
+}