tikzlibraryqrr.labels-pins-plus.code.tex

\def\tikz@swapanchor#1.#2\tikz@stop#3#4{#1#4#3}
\def\tikz@add@anchor#1#2{%
  \edef\tikz@temp{{#1}{#2}}%
  \expandafter\pgfutil@in@\tikz@temp
  \ifpgfutil@in@\expandafter\pgfutil@firstoftwo\else\expandafter\pgfutil@secondoftwo\fi
  {%
    \def\tikz@temp{#2}\ifx\tikz@temp\pgfutil@empty
        \expandafter\pgfutil@firstoftwo\else\expandafter\pgfutil@secondoftwo\fi
      {\edef#1{\expandafter\tikz@swapanchor#1\tikz@stop{}{}}}
      {\edef#1{\expandafter\tikz@swapanchor#1\tikz@stop{#2}{.}}}%
  }{%
    \def\tikz@temp{#2}\ifx\tikz@temp\pgfutil@empty
      \expandafter\pgfutil@gobble\else\expandafter\pgfutil@firstofone
      {\edef#1{#1.#2}}%
  }}
\tikzset{
  pin anchor/.style={tikz@pin@post/.append style={anchor=#1}},
  label anchor/.style={tikz@label@post/.append style={anchor=#1}},
  pin edge pin anchor/.style={
    append after command={\pgfextra\tikz@add@anchor{\tikzlastnode}{#1}\endpgfextra}},
  pin edge parent anchor/.style={
    append after command={\pgfextra\tikz@add@anchor{\tikz@save@last@node}{#1}\endpgfextra}}}