hoaparse: make it possible to read from a string

* src/hoaparse/public.hh, src/hoaparse/parsedecl.hh,
src/hoaparse/hoascan.ll, src/hoaparse/hoaparse.yy: Implement this new
interface.
* wrap/python/spot.py (automata): Use it when the argument contains
a newline.
* wrap/python/tests/automata-io.ipynb: Test it.

src/hoaparse/hoaparse.yy

@@ -1667,6 +1667,14 @@ namespace spot
       throw std::runtime_error(std::string("Cannot open file ") + name);
   }
 
+  hoa_stream_parser::hoa_stream_parser(const char* data,
+				       const std::string& filename,
+				       bool ignore_abort)
+    : filename_(filename), ignore_abort_(ignore_abort)
+  {
+    hoayystring(data);
+  }
+
   hoa_stream_parser::~hoa_stream_parser()
   {
     hoayyclose();

src/hoaparse/hoascan.ll

@@ -390,6 +390,14 @@ namespace spot
     return 0;
   }
 
+  int
+  hoayystring(const char* data)
+  {
+    yy_scan_string(data);
+    hoayyreset();
+    return 0;
+  }
+
   int
   hoayyopen(int fd)
   {

src/hoaparse/parsedecl.hh

@@ -34,6 +34,7 @@ namespace spot
   void hoayyreset();
   int hoayyopen(const std::string& name);
   int hoayyopen(int fd);
+  int hoayystring(const char* data);
   void hoayyclose();
 
   // This exception is thrown by the lexer when it reads "--ABORT--".

src/hoaparse/public.hh

@@ -68,6 +68,10 @@ namespace spot
     // Use filename in error messages.
     hoa_stream_parser(int fd, const std::string& filename,
 		      bool ignore_abort = false);
+    // Read from a buffer
+    hoa_stream_parser(const char* data,
+		      const std::string& filename,
+		      bool ignore_abort = false);
     ~hoa_stream_parser();
     hoa_aut_ptr parse(hoa_parse_error_list& error_list,
 		      const bdd_dict_ptr& dict,