1 files changed, 24 insertions, 2 deletions
diff --git a/Master/texmf-dist/tex/generic/pgf/math/pgfmathfunctions.code.tex b/Master/texmf-dist/tex/generic/pgf/math/pgfmathfunctions.code.tex
index fc08640e4f3..417ede069dd 100644
--- a/Master/texmf-dist/tex/generic/pgf/math/pgfmathfunctions.code.tex
+++ b/Master/texmf-dist/tex/generic/pgf/math/pgfmathfunctions.code.tex
@@ -1,4 +1,4 @@
-% Copyright 2007 by Mark Wibrow
+% Copyright 2019 by Mark Wibrow
 %
 % This file may be distributed and/or modified
 %
@@ -52,6 +52,7 @@
         {\expandafter\noexpand\csname pgfmath#1@\endcsname}%
         {\csname pgfmath@operation@#1@arity\endcsname}%
     }%
+    \pgfkeysvalueof{/pgf/declare function/execute at begin function}%
     \pgfmath@marshal%
 }
 
@@ -61,6 +62,7 @@
 % #4 - code for function <name>.
 %
 \def\pgfmath@@declarefunction#1#2#3#4{% Function of arity 0 - 9.
+    \pgfkeysvalueof{/pgf/declare function/execute at end function}%
     \ifcase#3\relax%
         \def#1{#2}%
         \def\pgfmath@@head{\def#2}%
@@ -109,7 +111,27 @@
 \pgfkeys{%
     /pgf/declare function/.code={%
         \pgfmath@local@functions#1@=@;%
-    }
+    },
+    /pgf/declare function/execute at begin function/.initial={},
+    /pgf/declare function/execute at end function/.initial={},
+    /pgf/declare function/ignore spaces/.is choice,
+    /pgf/declare function/ignore spaces/.default=true,
+    /pgf/declare function/ignore spaces/true/.style={%
+        /pgf/declare function/execute at begin function={%
+            \begingroup
+            \catcode`\^^I=9\relax
+            \catcode`\ =9\relax
+            \catcode`\~=10\relax
+            \endlinechar=`\ \relax
+        },
+        /pgf/declare function/execute at end function={%
+            \endgroup
+        },
+    },
+    /pgf/declare function/ignore spaces/false/.style={%
+        /pgf/declare function/execute at begin function={},
+        /pgf/declare function/execute at end function={},
+    },
 }
 
 \def\pgfmath@local@gobbleone#1{}