From c91f0323db9bfcf9426b00b44bce7bb676c3b65d Mon Sep 17 00:00:00 2001
From: Behdad Esfahbod <behdad@behdad.org>
Date: Tue, 10 Oct 2017 12:43:15 +0200
Subject: [PATCH] Rename CVTValues to arrayTools.Vector

This is generic, and useful in other cases.
---
 Lib/fontTools/misc/arrayTools.py     | 33 ++++++++++++++++++++++++++++
 Lib/fontTools/ttLib/tables/_c_v_t.py | 32 ---------------------------
 Lib/fontTools/varLib/__init__.py     |  4 ++--
 3 files changed, 35 insertions(+), 34 deletions(-)

diff --git a/Lib/fontTools/misc/arrayTools.py b/Lib/fontTools/misc/arrayTools.py
index a3b495b23..44c94e120 100644
--- a/Lib/fontTools/misc/arrayTools.py
+++ b/Lib/fontTools/misc/arrayTools.py
@@ -6,6 +6,7 @@
 
 from __future__ import print_function, division, absolute_import
 from fontTools.misc.py23 import *
+from numbers import Number
 import math
 
 def calcBounds(array):
@@ -119,6 +120,38 @@ def intRect(rect1):
     yMax = int(math.ceil(yMax))
     return (xMin, yMin, xMax, yMax)
 
+class Vector(object):
+	"""A math-like vector."""
+
+	def __init__(self, values, keep=False):
+		self.values = values if keep else list(values)
+
+	def __getitem__(self, index):
+		return self.values[index]
+
+	def __len__(self):
+		return len(self.values)
+
+	def __repr__(self):
+		return "Vector(%s)" % self.values
+
+	def __isub__(self, other):
+		if isinstance(other, Vector):
+			assert len(self.values) == len(other.values)
+			a = self.values
+			b = other.values
+			self.values = [a[i] - b[i] for i in range(len(self.values))]
+			return self
+		if isinstance(other, Number):
+			self.values = [v - other for v in self.values]
+			return self
+		return NotImplemented
+
+	def __mul__(self, other):
+		if isinstance(other, Number):
+			return Vector([v * other for v in self.values], keep=True)
+		return NotImplemented
+
 
 def _test():
     """
diff --git a/Lib/fontTools/ttLib/tables/_c_v_t.py b/Lib/fontTools/ttLib/tables/_c_v_t.py
index 15094f551..4fbee7bfc 100644
--- a/Lib/fontTools/ttLib/tables/_c_v_t.py
+++ b/Lib/fontTools/ttLib/tables/_c_v_t.py
@@ -1,5 +1,4 @@
 from __future__ import print_function, division, absolute_import
-from numbers import Number
 from fontTools.misc.py23 import *
 from fontTools.misc.textTools import safeEval
 from . import DefaultTable
@@ -48,34 +47,3 @@ class table__c_v_t(DefaultTable.DefaultTable):
 
 	def __delitem__(self, index):
 		del self.values[index]
-
-
-class CVTValues(object):
-	""" This is used in varLib for calculating control value deltas"""
-
-	def __init__(self, values):
-		self.values = list(values)
-
-	def __getitem__(self, index):
-		return self.values[index]
-
-	def __len__(self):
-		return len(self.values)
-
-	def __repr__(self):
-		return u"CVTValues(%s)" % self.values
-
-	def __isub__(self, other):
-		if isinstance(other, CVTValues):
-			assert len(self.values) == len(other)
-			self.values = [self.values[i] - other.values[i] for i in range(len(self.values))]
-			return self
-		if isinstance(other, Number):
-			self.values = [v - other for v in self.values]
-			return self
-		return NotImplemented
-
-	def __mul__(self, other):
-		if isinstance(other, Number):
-			return CVTValues([v * other for v in self.values])
-		return NotImplemented
diff --git a/Lib/fontTools/varLib/__init__.py b/Lib/fontTools/varLib/__init__.py
index 3c5c1f207..5d003c7ee 100644
--- a/Lib/fontTools/varLib/__init__.py
+++ b/Lib/fontTools/varLib/__init__.py
@@ -21,9 +21,9 @@ API *will* change in near future.
 from __future__ import print_function, division, absolute_import
 from __future__ import unicode_literals
 from fontTools.misc.py23 import *
+from fontTools.misc.arrayTools import Vector
 from fontTools.ttLib import TTFont, newTable
 from fontTools.ttLib.tables._n_a_m_e import NameRecord
-from fontTools.ttLib.tables._c_v_t import CVTValues
 from fontTools.ttLib.tables._f_v_a_r import Axis, NamedInstance
 from fontTools.ttLib.tables._g_l_y_f import GlyphCoordinates
 from fontTools.ttLib.tables.TupleVariation import TupleVariation
@@ -511,7 +511,7 @@ def _add_cvar(font, model, master_ttfs, tolerance=0.5):
 	cvar.version = 1
 	cvar.variations = []
 
-	allCVTs = [CVTValues(m["cvt "].values) for m in master_ttfs]
+	allCVTs = [Vector(m["cvt "].values) for m in master_ttfs]
 	num_cvts0 = len(allCVTs[0])
 
 	if (any(len(c) != num_cvts0 for c in allCVTs)):