Intermediate changes

commit_hash:efca680e102a12bb0a656779dafefc81261b3eac

1 files changed, 17 insertions, 2 deletions

diff --git a/contrib/python/fonttools/fontTools/misc/psCharStrings.py b/contrib/python/fonttools/fontTools/misc/psCharStrings.py
index 5d881c5816c..db837248dea 100644
--- a/contrib/python/fonttools/fontTools/misc/psCharStrings.py
+++ b/contrib/python/fonttools/fontTools/misc/psCharStrings.py
@@ -338,7 +338,7 @@ class SimpleT2Decompiler(object):
         self.numRegions = 0
         self.vsIndex = 0
 
-    def execute(self, charString):
+    def execute(self, charString, *, pushToStack=None):
         self.callingStack.append(charString)
         needsDecompilation = charString.needsDecompilation()
         if needsDecompilation:
@@ -346,7 +346,8 @@ class SimpleT2Decompiler(object):
             pushToProgram = program.append
         else:
             pushToProgram = lambda x: None
-        pushToStack = self.operandStack.append
+        if pushToStack is None:
+            pushToStack = self.operandStack.append
         index = 0
         while True:
             token, isOperator, index = charString.getToken(index)
@@ -551,6 +552,20 @@ t1Operators = [
 ]
 
 
+class T2StackUseExtractor(SimpleT2Decompiler):
+
+    def execute(self, charString):
+        maxStackUse = 0
+
+        def pushToStack(value):
+            nonlocal maxStackUse
+            self.operandStack.append(value)
+            maxStackUse = max(maxStackUse, len(self.operandStack))
+
+        super().execute(charString, pushToStack=pushToStack)
+        return maxStackUse
+
+
 class T2WidthExtractor(SimpleT2Decompiler):
     def __init__(
         self,