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[minwii.git] / src / minwii / logfilereader.py

diff --git a/src/minwii/logfilereader.py b/src/minwii/logfilereader.py
index 44c3611..a5a2d35 100755 (executable)
--- a/src/minwii/logfilereader.py
+++ b/src/minwii/logfilereader.py
@@ -6,12 +6,14 @@ $Id$
 $URL$
 """
 
+from types import StringTypes
 from widgets.playingscreen import PlayingScreenBase
 from eventutils import EventDispatcher
 from events import eventCodes
 from synth import Synth
 from musicxml import musicXml2Song
 import pygame
+from backwardsfilereader import BackwardsReader
 
 SUPPORTED_FILE_HEADER = 'ENV winwii log format version : 1.0'
 
@@ -29,12 +31,12 @@ class LogFileReader(object) :
     classe utilitaire pour l'accès aux données d'un fichier de log MinWii.
     """
     
-    def __init__(self, logfile) :
+    def __init__(self, logfile, mode='r') :
         """ logfile : chemin d'accès au fichier de log MinWii.
             le format supporté est actuellement la version 1.0 uniquement.
         """
-        if isinstance(logfile, str) :
-            self.logfile = open(logfile, 'r')
+        if isinstance(logfile, StringTypes) :
+            self.logfile = open(logfile, mode)
         else :
             self.logfile = logfile
         
@@ -106,8 +108,20 @@ class LogFileReader(object) :
         firstTicks = int(l.split(None, 2)[1])
         return firstTicks
     
+    @inplaceread
+    def getLastEventTicks(self) :
+        "retourne le timecode du dernier événement (entier)"
+        for l in self.getBackwardLineIterator() :
+            if l.startswith('EVT ') :
+                break
+        else :
+            return None
+        
+        lastTicks = int(l.split(None, 2)[1])
+        return lastTicks
+    
     def __del__(self) :
-        self.logfile.close()
+        self.close()
     
     def __iter__(self) :
         return self
@@ -139,6 +153,47 @@ class LogFileReader(object) :
                 ticks, eventName = l.split(None, 3)[1:]
                 ticks = int(ticks)
                 yield ticks, eventName, ''
+    
+    def getBackwardLineIterator(self) :
+        br = BackwardsReader(self.logfile, BLKSIZE=128)
+        line = br.readline()
+        while line :
+            yield line.strip()
+            line = br.readline()
+    
+    @inplaceread
+    def getMetadata(self) :
+        metadata = {}
+        self.next() # skip identification line.
+        line = self.next()
+        while line.startswith('METADATA ') :
+            line = line.split(None, 1)[1]
+            name, value = [v.strip() for v in line.split(':', 1)]
+            metadata[name] = value
+            line = self.next()
+        return metadata
+    
+    def setMetadata(self, metadata) :
+        f = self.logfile
+        f.seek(0)
+        before = f.readline()
+        line = f.readline()
+        while line.startswith('METADATA ') :
+            line = f.readline()
+        after = line + f.read()
+        
+        lines = []
+        for name, value in metadata :
+            lines.append('METADATA %s : %s' % (name, value.encode('utf-8')))
+        metadata = '\n'.join(lines)
+        f.seek(0)
+        f.write(before)
+        f.write(metadata)
+        f.write(after)
+    
+    def close(self) :
+        self.logfile.close()
+        
                 
 
 class LogFilePlayer(PlayingScreenBase) :
@@ -210,5 +265,4 @@ class LogFilePlayer(PlayingScreenBase) :
             previousTicks = ticks
         
         self.stop()
-        
     
\ No newline at end of file