diff --git a/frc971/analysis/logreader.py b/frc971/analysis/logreader.py
new file mode 100644
index 0000000..34f1b01
--- /dev/null
+++ b/frc971/analysis/logreader.py
@@ -0,0 +1,97 @@
+#!/usr/bin/python3
+
+import collections
+from logentry import LogEntry
+
+class Dataset(object):
+  def __init__(self):
+    self.time = []
+    self.data = []
+
+  def Add(self, time, data):
+    self.time.append(time)
+    self.data.append(data)
+
+class CollectingLogReader(object):
+  """
+  Reads log files and collected requested data.
+  """
+  def __init__(self):
+    self.signal = collections.OrderedDict()
+
+  def Add(self, binary, struct_instance_name, *data_search_path):
+    """
+    Specifies a specific piece of data to collect
+
+    Args:
+      binary: str, The name of the executable that generated the log.
+      struct_instance_name: str, The name of the struct instance whose data
+                            contents should be collected.
+      data_search_path: [str], The path into the struct of the exact piece of
+                        data to collect.
+
+    Returns:
+      None
+    """
+    self.signal[(binary, struct_instance_name, data_search_path)] = Dataset()
+
+  def HandleFile(self, f):
+    """
+    Parses the specified log file.
+
+    Args:
+      f: str, The filename of the log whose data to parse.
+
+    Returns:
+      None
+    """
+    with open(f, 'r') as fd:
+      for line in fd:
+        self.HandleLine(line)
+
+  def HandleLine(self, line):
+    """
+    Parses a line from a log file and adds the data to the plot data.
+
+    Args:
+      line: str, The line from the log file to parse
+
+    Returns:
+      None
+    """
+    pline = LogEntry(line)
+    pline_data = None
+
+    for key in self.signal:
+      value = self.signal[key]
+      binary = key[0]
+      struct_instance_name = key[1]
+      data_search_path = key[2]
+      boolean_multiplier = None
+
+      # If the plot definition line ends with a "-b X" where X is a number then
+      # that number gets drawn when the value is True. Zero gets drawn when the
+      # value is False.
+      if len(data_search_path) >= 2 and data_search_path[-2] == '-b':
+        boolean_multiplier = float(data_search_path[-1])
+        data_search_path = data_search_path[:-2]
+
+      # Make sure that we're looking at the right binary structure instance.
+      if binary == pline.name:
+        if pline.msg.startswith(struct_instance_name + ': '):
+          # Parse the structure once.
+          if pline_data is None:
+              _, _, pline_data = pline.ParseStruct()
+          # Traverse the structure as specified in `data_search_path`.
+          # This lets the user access very deeply nested structures.
+          data = pline_data
+          for path in data_search_path:
+            data = data[path]
+
+          if boolean_multiplier is not None:
+            if data == 'T':
+              value.Add(pline.time, boolean_multiplier)
+            else:
+              value.Add(pline.time, 0)
+          else:
+            value.Add(pline.time, data)