From be8a44033bd490ea7f4ddb1514a9cc2888affb88 Mon Sep 17 00:00:00 2001
From: Théo de la Hogue
Date: Wed, 4 Sep 2024 13:56:36 +0200
Subject: Improving CVS file parsing. Documenting CSV file support.

---
 .../configuration_and_execution.md                 |    1 +
 .../eye_tracking_context/context_modules/file.md   |   35 +
 docs/user_guide/utils/demonstrations_scripts.md    |   10 +-
 mkdocs.yml                                         |    1 +
 src/argaze/utils/contexts/File.py                  |  100 +-
 src/argaze/utils/contexts/__init__.py              |    4 +-
 src/argaze/utils/demo/csv_file_context.json        |   10 -
 .../utils/demo/csv_file_context_xy_list.json       |    9 +
 .../utils/demo/csv_file_context_xy_splitted.json   |   10 +
 src/argaze/utils/demo/gaze_positions.csv           | 1052 --------------------
 src/argaze/utils/demo/gaze_positions_xy_list.csv   | 1052 ++++++++++++++++++++
 .../utils/demo/gaze_positions_xy_splitted.csv      | 1052 ++++++++++++++++++++
 12 files changed, 2253 insertions(+), 1083 deletions(-)
 create mode 100644 docs/user_guide/eye_tracking_context/context_modules/file.md
 delete mode 100644 src/argaze/utils/demo/csv_file_context.json
 create mode 100644 src/argaze/utils/demo/csv_file_context_xy_list.json
 create mode 100644 src/argaze/utils/demo/csv_file_context_xy_splitted.json
 delete mode 100644 src/argaze/utils/demo/gaze_positions.csv
 create mode 100644 src/argaze/utils/demo/gaze_positions_xy_list.csv
 create mode 100644 src/argaze/utils/demo/gaze_positions_xy_splitted.csv

diff --git a/docs/user_guide/eye_tracking_context/configuration_and_execution.md b/docs/user_guide/eye_tracking_context/configuration_and_execution.md
index 100ab5e..3deeb57 100644
--- a/docs/user_guide/eye_tracking_context/configuration_and_execution.md
+++ b/docs/user_guide/eye_tracking_context/configuration_and_execution.md
@@ -7,6 +7,7 @@ The [utils.contexts module](../../argaze.md/#argaze.utils.contexts) provides rea
 * [Tobii Pro Glasses 3](context_modules/tobii_pro_glasses_3.md) data capture context,
 * [Pupil Labs Invisible](context_modules/pupil_labs_invisible.md) data capture context,
 * [Pupil Labs Neon](context_modules/pupil_labs_neon.md) data capture context,
+* [File](context_modules/file.md) data playback contexts,
 * [OpenCV](context_modules/opencv.md) window cursor position capture and movie playback,
 * [Random](context_modules/random.md) gaze position generator.
 
diff --git a/docs/user_guide/eye_tracking_context/context_modules/file.md b/docs/user_guide/eye_tracking_context/context_modules/file.md
new file mode 100644
index 0000000..8a66b83
--- /dev/null
+++ b/docs/user_guide/eye_tracking_context/context_modules/file.md
@@ -0,0 +1,35 @@
+File
+======
+
+ArGaze provides a ready-made contexts to read data from various file format.
+
+To select a desired context, the JSON samples have to be edited and saved inside an [ArContext configuration](../configuration_and_execution.md) file.
+Notice that the *pipeline* entry is mandatory.
+
+```json
+{
+	JSON sample
+	"pipeline": ...
+}
+```
+
+Read more about [ArContext base class in code reference](../../../argaze.md/#argaze.ArFeatures.ArContext).
+
+## CSV
+
+::: argaze.utils.contexts.File.CSV
+
+### JSON sample
+
+```json
+{
+    "argaze.utils.contexts.File.CSV": {
+        "name": "CSV file data playback",
+        "path": "./src/argaze/utils/demo/gaze_positions.csv",
+        "timestamp_column": "Timestamp (ms)",
+        "x_column": "Gaze Position X (px)",
+        "y_column": "Gaze Position Y (px)",
+        "pipeline": ...
+    }
+}
+```
diff --git a/docs/user_guide/utils/demonstrations_scripts.md b/docs/user_guide/utils/demonstrations_scripts.md
index e55e547..a2698b4 100644
--- a/docs/user_guide/utils/demonstrations_scripts.md
+++ b/docs/user_guide/utils/demonstrations_scripts.md
@@ -22,10 +22,16 @@ python -m argaze load ./src/argaze/utils/demo/random_context.json
 
 ## CSV file context
 
-Load **csv_file_context.json** file to analyze gaze positions from a CSV file:
+Load **csv_file_context_xy_splitted.json** file to analyze gaze positions from a CSV file where gaze position coordinates are splitted in two seperated column:
 
 ```shell
-python -m argaze load ./src/argaze/utils/demo/csv_file_context.json
+python -m argaze load ./src/argaze/utils/demo/csv_file_context_xy_splitted.json
+```
+
+Load **csv_file_context_xy_list.json** file to analyze gaze positions from a CSV file where gaze position coordinates are stored as a list in one single column:
+
+```shell
+python -m argaze load ./src/argaze/utils/demo/csv_file_context_xy_list.json
 ```
 
 ## OpenCV
diff --git a/mkdocs.yml b/mkdocs.yml
index 6384ae0..19ec21a 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -12,6 +12,7 @@ nav:
       - user_guide/eye_tracking_context/context_modules/tobii_pro_glasses_3.md
       - user_guide/eye_tracking_context/context_modules/pupil_labs_invisible.md
       - user_guide/eye_tracking_context/context_modules/pupil_labs_neon.md
+      - user_guide/eye_tracking_context/context_modules/file.md
       - user_guide/eye_tracking_context/context_modules/opencv.md
       - user_guide/eye_tracking_context/context_modules/random.md
     - Advanced Topics:
diff --git a/src/argaze/utils/contexts/File.py b/src/argaze/utils/contexts/File.py
index da12c5a..68854b8 100644
--- a/src/argaze/utils/contexts/File.py
+++ b/src/argaze/utils/contexts/File.py
@@ -21,6 +21,7 @@ import logging
 import time
 import math
 import threading
+import ast
 
 import pandas
 import numpy
@@ -39,9 +40,12 @@ class CSV(ArFeatures.DataPlaybackContext):
 		# Init private attributes
 		self.__path = None
 		self.__separator = ','
+
 		self.__timestamp_column = None
 		self.__x_column = None
 		self.__y_column = None
+		self.__xy_column = None
+
 		self.__start = math.nan
 		self.__end = math.nan
 		self.__duration = 0.
@@ -69,7 +73,10 @@ class CSV(ArFeatures.DataPlaybackContext):
 
 	@property
 	def timestamp_column(self) -> str:
-		"""Select timestamp column."""
+		"""Timestamp column name in file. 
+		!!! warning
+		    This column name is mandatory.
+		"""
 		return self.__timestamp_column
 
 	@timestamp_column.setter
@@ -79,7 +86,10 @@ class CSV(ArFeatures.DataPlaybackContext):
 
 	@property
 	def x_column(self) -> str:
-		"""Select x column."""
+		"""X coordinate column name.
+		!!! note
+		    This column name is required in the case where gaze position coordinate is splitted in two columns.
+		"""
 		return self.__x_column
 
 	@x_column.setter
@@ -89,13 +99,30 @@ class CSV(ArFeatures.DataPlaybackContext):
 
 	@property
 	def y_column(self) -> str:
-		"""Select y column."""
+		"""Y coordinate column name.
+		!!! note
+		    This column name is required in the case where gaze position coordinate is splitted in two columns.
+		"""
 		return self.__y_column
 
 	@y_column.setter
 	def y_column(self, y_column: str):
 
 		self.__y_column = y_column
+
+	@property
+	def xy_column(self) -> str:
+		"""X and Y coordinate column name.
+		!!! note
+		    This column name is required in the case where gaze position coordinate is a list stored in one column.
+		"""
+		return self.__xy_column
+
+	@xy_column.setter
+	def xy_column(self, xy_column: str):
+
+		self.__xy_column = xy_column
+
 	@property
 	def start(self) -> int|float:
 		"""Start reading timestamp."""
@@ -133,21 +160,40 @@ class CSV(ArFeatures.DataPlaybackContext):
 
 		logging.info('CSV file context starts...')
 
-		# Load gaze positions from a CSV file into Panda Dataframe
-		data_selector = {
-			self.__timestamp_column: numpy.float64,
-			self.__x_column: numpy.float64, 
-			self.__y_column: numpy.float64
-		}
+		# Select data to load from CSV file
+		data_columns = []
+		data_types = {}
+		data_converters = {}
+
+		# Select timestamp column
+		if self.__timestamp_column:
+
+			data_columns.append(self.__timestamp_column)
+			data_types[self.__timestamp_column] = numpy.float64
+
+		else:
+
+			logging.error('Missing timestamp column name')
 
-		dataframe = pandas.read_csv(self.__path, delimiter = self.__separator, low_memory = False, usecols=data_selector.keys(), dtype=data_selector)
+		# Case where gaze position coordinate is splitted in two columns
+		if self.__x_column and self.__y_column:
 
-		# Rename columns with generic names
-		dataframe.rename(columns={
-				self.__timestamp_column: 'timestamp',
-				self.__x_column: 'x', 
-				self.__y_column: 'y'
-			}, inplace=True)
+			data_columns.append(self.__x_column)
+			data_types[self.__x_column] = numpy.float64
+
+			data_columns.append(self.__y_column)
+			data_types[self.__y_column] = numpy.float64
+
+		# Case where gaze position coordinate is a list stored in one column
+		elif self.__xy_column:
+
+			data_columns.append(self.__xy_column)
+			data_converters[self.__xy_column] = ast.literal_eval
+
+		dataframe = pandas.read_csv(self.__path, delimiter = self.__separator, low_memory = False, usecols=data_columns, dtype=data_types, converters=data_converters)
+
+		# DEBUG
+		print(dataframe)
 
 		# Optionnaly select a time range
 		if not math.isnan(self.start):
@@ -158,6 +204,26 @@ class CSV(ArFeatures.DataPlaybackContext):
 
 			dataframe = dataframe.loc[(dataframe['timestamp'] <= self.end)]
 
+		# Transform dataframe to a get only timestamp, x, y columns
+
+		# Case where gaze position coordinate is splitted in two columns
+		if self.__x_column and self.__y_column:
+
+			dataframe.rename(columns={
+					self.__timestamp_column: 'timestamp',
+					self.__x_column: 'x', 
+					self.__y_column: 'y'
+				}, inplace=True)
+
+		# Case where gaze position coordinate is a list stored in one column
+		elif self.__xy_column:
+
+			dataframe.rename(columns={
+					self.__timestamp_column: 'timestamp',
+				}, inplace=True)
+
+			dataframe[['x','y']] = pandas.DataFrame(dataframe[self.__xy_column].to_list(), columns=['x','y'])
+
 		# Filter unvalid gaze positions
 		len_before = len(dataframe)
 		dataframe = dataframe[(dataframe['x'].notna() & dataframe['y']).notna()]
@@ -212,5 +278,5 @@ class CSV(ArFeatures.DataPlaybackContext):
 			self.__progression = row['timestamp'] / self.__duration
 
 			# TEST
-			#time.sleep(0.01)
+			time.sleep(0.01)
 		
\ No newline at end of file
diff --git a/src/argaze/utils/contexts/__init__.py b/src/argaze/utils/contexts/__init__.py
index 19b7533..c427de0 100644
--- a/src/argaze/utils/contexts/__init__.py
+++ b/src/argaze/utils/contexts/__init__.py
@@ -1,4 +1,4 @@
 """
-Collection of device interfaces.
+Collection of contexts.
 """
-__all__ = ['TobiiProGlasses2']
+__all__ = ['File','OpencCV','PupilLabsInvisible','PupilLabsNeon','Random','TobiiProGlasses2','TobiiProGlasses3']
diff --git a/src/argaze/utils/demo/csv_file_context.json b/src/argaze/utils/demo/csv_file_context.json
deleted file mode 100644
index a09914f..0000000
--- a/src/argaze/utils/demo/csv_file_context.json
+++ /dev/null
@@ -1,10 +0,0 @@
-{
-    "argaze.utils.contexts.File.CSV" : {
-        "name": "CSV file data playback",
-        "path": "./src/argaze/utils/demo/gaze_positions.csv",
-        "timestamp_column": "Timestamp (ms)",
-        "x_column": "Gaze Position X (px)",
-        "y_column": "Gaze Position Y (px)",
-        "pipeline": "gaze_analysis_pipeline.json"
-    }
-}
\ No newline at end of file
diff --git a/src/argaze/utils/demo/csv_file_context_xy_list.json b/src/argaze/utils/demo/csv_file_context_xy_list.json
new file mode 100644
index 0000000..2030b8b
--- /dev/null
+++ b/src/argaze/utils/demo/csv_file_context_xy_list.json
@@ -0,0 +1,9 @@
+{
+    "argaze.utils.contexts.File.CSV" : {
+        "name": "CSV file data playback",
+        "path": "./src/argaze/utils/demo/gaze_positions_xy_list.csv",
+        "timestamp_column": "Timestamp (ms)",
+        "xy_column": "Gaze Position (px)",
+        "pipeline": "gaze_analysis_pipeline.json"
+    }
+}
\ No newline at end of file
diff --git a/src/argaze/utils/demo/csv_file_context_xy_splitted.json b/src/argaze/utils/demo/csv_file_context_xy_splitted.json
new file mode 100644
index 0000000..87fce4d
--- /dev/null
+++ b/src/argaze/utils/demo/csv_file_context_xy_splitted.json
@@ -0,0 +1,10 @@
+{
+    "argaze.utils.contexts.File.CSV" : {
+        "name": "CSV file data playback",
+        "path": "./src/argaze/utils/demo/gaze_positions_xy_splitted.csv",
+        "timestamp_column": "Timestamp (ms)",
+        "x_column": "Gaze Position X (px)",
+        "y_column": "Gaze Position Y (px)",
+        "pipeline": "gaze_analysis_pipeline.json"
+    }
+}
\ No newline at end of file
diff --git a/src/argaze/utils/demo/gaze_positions.csv b/src/argaze/utils/demo/gaze_positions.csv
deleted file mode 100644
index 558c995..0000000
--- a/src/argaze/utils/demo/gaze_positions.csv
+++ /dev/null
@@ -1,1052 +0,0 @@
-"Timestamp (ms)","Gaze Position X (px)","Gaze Position Y (px)"
-6016,400,443
-6056,400,443
-6106,401,443
-6128,401,443
-6168,401,442
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diff --git a/src/argaze/utils/demo/gaze_positions_xy_list.csv b/src/argaze/utils/demo/gaze_positions_xy_list.csv
new file mode 100644
index 0000000..759b897
--- /dev/null
+++ b/src/argaze/utils/demo/gaze_positions_xy_list.csv
@@ -0,0 +1,1052 @@
+"Timestamp (ms)","Gaze Position (px)"
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diff --git a/src/argaze/utils/demo/gaze_positions_xy_splitted.csv b/src/argaze/utils/demo/gaze_positions_xy_splitted.csv
new file mode 100644
index 0000000..558c995
--- /dev/null
+++ b/src/argaze/utils/demo/gaze_positions_xy_splitted.csv
@@ -0,0 +1,1052 @@
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