Add automatic tests for Tick Processor, take two.

tools/tickprocessor.js

Index: tools/tickprocessor.js
diff --git a/tools/tickprocessor.js b/tools/tickprocessor.js
index 4afc69f613badbe4e8f219e05788571cbb797a95..c95a4e616edcfe7b3a39706fa4747014560abef7 100644
--- a/tools/tickprocessor.js
+++ b/tools/tickprocessor.js
@@ -288,7 +288,11 @@ TickProcessor.prototype.printStatistics = function() {
 function padLeft(s, len) {
   s = s.toString();
   if (s.length < len) {
-    s = (new Array(len - s.length + 1).join(' ')) + s;
+    var padLength = len - s.length;
+    if (!(padLength in padLeft)) {
+      padLeft[padLength] = new Array(padLength + 1).join(' ');
+    }
+    s = padLeft[padLength] + s;
   }
   return s;
 };
@@ -511,25 +515,11 @@ WindowsCppEntriesProvider.prototype.unmangleName = function(name) {
 };
 
 
-function padRight(s, len) {
-  s = s.toString();
-  if (s.length < len) {
-    s = s + (new Array(len - s.length + 1).join(' '));
-  }
-  return s;
-};
-
+function ArgumentsProcessor(args) {
+  this.args_ = args;
+  this.result_ = ArgumentsProcessor.DEFAULTS;
 
-function processArguments(args) {
-  var result = {
-    logFileName: 'v8.log',
-    platform: 'unix',
-    stateFilter: null,
-    ignoreUnknown: false,
-    separateIc: false,
-    nm: 'nm'
-  };
-  var argsDispatch = {
+  this.argsDispatch_ = {
     '-j': ['stateFilter', TickProcessor.VmStates.JS,
         'Show only ticks from JS VM state'],
     '-g': ['stateFilter', TickProcessor.VmStates.GC,
@@ -551,63 +541,82 @@ function processArguments(args) {
     '--nm': ['nm', 'nm',
         'Specify the \'nm\' executable to use (e.g. --nm=/my_dir/nm)']
   };
-  argsDispatch['--js'] = argsDispatch['-j'];
-  argsDispatch['--gc'] = argsDispatch['-g'];
-  argsDispatch['--compiler'] = argsDispatch['-c'];
-  argsDispatch['--other'] = argsDispatch['-o'];
-  argsDispatch['--external'] = argsDispatch['-e'];
-
-  function printUsageAndExit() {
-    print('Cmdline args: [options] [log-file-name]\n' +
-          'Default log file name is "v8.log".\n');
-    print('Options:');
-    for (var arg in argsDispatch) {
-      var synonims = [arg];
-      var dispatch = argsDispatch[arg];
-      for (var synArg in argsDispatch) {
-        if (arg !== synArg && dispatch === argsDispatch[synArg]) {
-          synonims.push(synArg);
-          delete argsDispatch[synArg];
-        }
-      }
-      print('  ' + padRight(synonims.join(', '), 20) + dispatch[2]);
-    }
-    quit(2);
-  }
+  this.argsDispatch_['--js'] = this.argsDispatch_['-j'];
+  this.argsDispatch_['--gc'] = this.argsDispatch_['-g'];
+  this.argsDispatch_['--compiler'] = this.argsDispatch_['-c'];
+  this.argsDispatch_['--other'] = this.argsDispatch_['-o'];
+  this.argsDispatch_['--external'] = this.argsDispatch_['-e'];
+};
+
 
-  while (args.length) {
-    var arg = args[0];
+ArgumentsProcessor.DEFAULTS = {
+  logFileName: 'v8.log',
+  platform: 'unix',
+  stateFilter: null,
+  ignoreUnknown: false,
+  separateIc: false,
+  nm: 'nm'
+};
+
+
+ArgumentsProcessor.prototype.parse = function() {
+  while (this.args_.length) {
+    var arg = this.args_[0];
     if (arg.charAt(0) != '-') {
       break;
     }
-    args.shift();
+    this.args_.shift();
     var userValue = null;
     var eqPos = arg.indexOf('=');
     if (eqPos != -1) {
       userValue = arg.substr(eqPos + 1);
       arg = arg.substr(0, eqPos);
     }
-    if (arg in argsDispatch) {
-      var dispatch = argsDispatch[arg];
-      result[dispatch[0]] = userValue == null ? dispatch[1] : userValue;
+    if (arg in this.argsDispatch_) {
+      var dispatch = this.argsDispatch_[arg];
+      this.result_[dispatch[0]] = userValue == null ? dispatch[1] : userValue;
     } else {
-      printUsageAndExit();
+      return false;
     }
   }
 
-  if (args.length >= 1) {
-      result.logFileName = args.shift();
+  if (this.args_.length >= 1) {
+      this.result_.logFileName = this.args_.shift();
   }
-  return result;
+  return true;
 };
 
 
-var params = processArguments(arguments);
-var tickProcessor = new TickProcessor(
-    params.platform == 'unix' ? new UnixCppEntriesProvider(params.nm) :
-        new WindowsCppEntriesProvider(),
-    params.separateIc,
-    params.ignoreUnknown,
-    params.stateFilter);
-tickProcessor.processLogFile(params.logFileName);
-tickProcessor.printStatistics();
+ArgumentsProcessor.prototype.result = function() {
+  return this.result_;
+};
+
+
+ArgumentsProcessor.prototype.printUsageAndExit = function() {
+
+  function padRight(s, len) {
+    s = s.toString();
+    if (s.length < len) {
+      s = s + (new Array(len - s.length + 1).join(' '));
+    }
+    return s;
+  }
+
+  print('Cmdline args: [options] [log-file-name]\n' +
+        'Default log file name is "' +
+        ArgumentsProcessor.DEFAULTS.logFileName + '".\n');
+  print('Options:');
+  for (var arg in this.argsDispatch_) {
+    var synonims = [arg];
+    var dispatch = this.argsDispatch_[arg];
+    for (var synArg in this.argsDispatch_) {
+      if (arg !== synArg && dispatch === this.argsDispatch_[synArg]) {
+        synonims.push(synArg);
+        delete this.argsDispatch_[synArg];
+      }
+    }
+    print('  ' + padRight(synonims.join(', '), 20) + dispatch[2]);
+  }
+  quit(2);
+};
+