Fix makestatic for recent version of pyparsing

It's working with pyparsing 2.4.7
Add sagestr support.
Sageexample environment is still not supported

(cherry-picked from pull request sagemath#55 by @vincek59)

Author: vincek59

scripts.dtx

@@ -293,15 +293,15 @@ from pyparsing import *
 %    \begin{macrocode}
 def skipToMatching(opener, closer):
   nest = nestedExpr(opener, closer)
-  nest.setParseAction(lambda l, s, t: l[s:getTokensEndLoc()])
-  return nest
+  return originalTextFor(nest)
 
 curlybrackets = skipToMatching('{', '}')
 squarebrackets = skipToMatching('[', ']')
 %    \end{macrocode}
 % Next, parser for |\sage|, |\sageplot|, and pause/unpause calls:
 %    \begin{macrocode}
 sagemacroparser = r'\sage' + curlybrackets('code')
+sagestrmacroparser = r'\sagestr' + curlybrackets('code')
 sageplotparser = (r'\sageplot'
                  + Optional(squarebrackets)('opts')
                  + Optional(squarebrackets)('format')
@@ -377,8 +377,10 @@ class DeSageTex():
 % Parse |\sage| macros. We just need to pull in the result from the
 % |.sout| file and increment the counter---that's what |self.sage| does.
 %    \begin{macrocode}
+    strmacro = sagestrmacroparser
     smacro = sagemacroparser
     smacro.setParseAction(self.sage)
+    strmacro.setParseAction(self.sage)
 %    \end{macrocode}
 % Parse the |\usepackage{sagetex}| line. Right now we don't support
 % comma-separated lists of packages.
@@ -422,7 +424,7 @@ class DeSageTex():
 % looks for any one of the above bits, while ignoring anything that
 % should be ignored.
 %    \begin{macrocode}
-    doit = smacro | senv | ssilent | usepackage | splot | stexindent
+    doit = smacro | senv | ssilent | usepackage | splot | stexindent |strmacro
     doit.ignore('%' + restOfLine)
     doit.ignore(r'\begin{verbatim}' + SkipTo(r'\end{verbatim}'))
     doit.ignore(r'\begin{comment}' + SkipTo(r'\end{comment}'))