fix latex escaping

* src/ltlvisit/print.cc: Property output the double
quotes in latex mode, not only sclatex.
* src/misc/escape.cc: Fix LaTeX escape to work in math mode.
* src/tests/latex.test: Add a test.
* wrap/python/tests/formulas.ipynb: Adjust expected output
* NEWS: Mention the fix.

src/ltlvisit/print.cc

@@ -416,8 +416,8 @@ namespace spot
 	    {
 	      // Spin 6 supports atomic propositions such as (a == 0)
 	      // as long as they are enclosed in parentheses.
-	      if (kw_ == sclatex_kw  || kw_ == sclatex_kw)
-		escape_latex(os_ << "``\\mathit{", str) << "\\textrm{''}}";
+	      if (kw_ == sclatex_kw  || kw_ == latex_kw)
+		escape_latex(os_ << "``\\mathit{", str) << "}\\textrm{''}";
 	      else if (kw_ != spin_kw)
 		os_ << '"' << str << '"';
 	      else if (!full_parent_)

src/misc/escape.cc

@@ -54,13 +54,13 @@ namespace spot
       switch (i)
 	{
 	case '~':
-	  os << "\\textasciitilde";
+	  os << "\\text{\\textasciitilde}";
 	  break;
 	case '^':
-	  os << "\\textasciicircum";
+	  os << "\\text{\\textasciicircum}";
 	  break;
 	case '\\':
-	  os << "\\textbackslash";
+	  os << "\\text{\\textbackslash}";
 	  break;
 	case '&':
 	case '%':

src/tests/latex.test

@@ -29,7 +29,7 @@ set -e
 (kpsewhich txfonts.sty) || exit 77
 (kpsewhich amsmath.sty) || exit 77
 
-cat >input <<EOF
+cat >input <<\EOF
 XGFa <-> FGX(!b & !c) | (b ^ a)
 a U b W c R (d & e) M f
 {a;b[=2];((c:d*) && f*);e[*2..]}<>-> {((a | [*0])*;b[+]) & (c1[->2])}[]-> h
@@ -37,6 +37,7 @@ a U b W c R (d & e) M f
 !{a;b*;c}! -> d
 {a*;(b;c)[:*3..4];(c;d)[:+];d}!
 G(uglyname->Fuglierlongname42)
+"#foo/$bar$" U "baz~yes^no"
 EOF
 
 (