std::string throws typemaps

Go, Guile, Racket, Scilab: Add throws typemaps for std::string so that
thrown string exception messages can be seen.

Test all language for std::string throws typemaps

CHANGES.current

@@ -7,6 +7,14 @@ the issue number to the end of the URL: https://github.com/swig/swig/issues/
 Version 4.1.0 (in progress)
 ===========================
 
+2022-09-17: wsfulton
+            [Go, Guile, Racket, Scilab] Add throws typemaps for std::string so that thrown
+            string exception messages can be seen.
+
+2022-09-17: wsfulton
+            [Racket] Add throws typemaps for char * so that thrown string exception
+            messages can be seen from Racket.
+
 2022-09-17: wsfulton
             [Javascript, Octave, R] Improve exceptions for %catches and exception
             specifications for native types. String exception messages are shown as

Examples/test-suite/catches_strings.i

@@ -3,11 +3,15 @@
 %include <std_string.i>
 
 %catches(const char *) StringsThrower::charstring;
+%catches(std::string) StringsThrower::stdstring;
 
 %inline %{
 struct StringsThrower {
   static void charstring() {
     throw "charstring message";
   }
+  static void stdstring() {
+    throw std::string("stdstring message");
+  }
 };
 %}

Examples/test-suite/csharp/catches_strings_runme.cs

@@ -16,5 +16,17 @@ public class catches_strings_runme {
       if (!exception_thrown)
         throw new ApplicationException("Should have thrown an exception");
     }
+    {
+      bool exception_thrown = false;
+      try {
+        StringsThrower.stdstring();
+      } catch (ApplicationException e) {
+        if (!e.Message.Contains("stdstring message"))
+          throw new ApplicationException("incorrect exception message:" + e);
+        exception_thrown = true;
+      }
+      if (!exception_thrown)
+        throw new ApplicationException("Should have thrown an exception");
+    }
   }
 }

Examples/test-suite/d/catches_strings_runme.1.d

@@ -17,4 +17,16 @@ void main() {
     if (!exception_thrown)
       throw new Exception("Should have thrown an exception");
   }
+  {
+    bool exception_thrown = false;
+    try {
+      StringsThrower.stdstring();
+    } catch (Exception e) {
+      if (!canFind(e.msg, "stdstring message"))
+        throw new Exception("incorrect exception message:" ~ e.msg);
+      exception_thrown = true;
+    }
+    if (!exception_thrown)
+      throw new Exception("Should have thrown an exception");
+  }
 }

Examples/test-suite/d/catches_strings_runme.2.d

@@ -17,4 +17,16 @@ void main() {
     if (!exception_thrown)
       throw new Exception("Should have thrown an exception");
   }
+  {
+    bool exception_thrown = false;
+    try {
+      StringsThrower.stdstring();
+    } catch (Exception e) {
+      if (!canFind(e.msg, "stdstring message"))
+        throw new Exception("incorrect exception message:" ~ e.msg);
+      exception_thrown = true;
+    }
+    if (!exception_thrown)
+      throw new Exception("Should have thrown an exception");
+  }
 }

Examples/test-suite/go/catches_strings_runme.go

@@ -4,14 +4,29 @@ import "strings"
 import . "swigtests/catches_strings"
 
 func main() {
-  exception_thrown := false
-  func() {
-    defer func() {
-      exception_thrown = strings.Index(recover().(string), "charstring message") == 0
+  {
+    exception_thrown := false
+    func() {
+      defer func() {
+        exception_thrown = strings.Index(recover().(string), "charstring message") == 0
+      }()
+      StringsThrowerCharstring()
     }()
-    StringsThrowerCharstring()
-  }()
-  if !exception_thrown {
-    panic(0)
+    if !exception_thrown {
+      panic(0)
+    }
+  }
+
+  {
+    exception_thrown := false
+    func() {
+      defer func() {
+        exception_thrown = strings.Index(recover().(string), "stdstring message") == 0
+      }()
+      StringsThrowerStdstring()
+    }()
+    if !exception_thrown {
+      panic(0)
+    }
   }
 }

Examples/test-suite/java/catches_strings_runme.java

@@ -24,5 +24,18 @@ public class catches_strings_runme {
       if (!exception_thrown)
         throw new RuntimeException("Should have thrown an exception");
     }
+
+    {
+      boolean exception_thrown = false;
+      try {
+        StringsThrower.stdstring();
+      } catch (RuntimeException e) {
+        if (!e.getMessage().contains("stdstring message"))
+          throw new RuntimeException("incorrect exception message");
+        exception_thrown = true;
+      }
+      if (!exception_thrown)
+        throw new RuntimeException("Should have thrown an exception");
+    }
   }
 }

Examples/test-suite/javascript/catches_strings_runme.js

@@ -4,12 +4,20 @@ exception_thrown = false;
 try {
   catches_strings.StringsThrower.charstring();
 } catch (e) {
-    console.log(typeof(e))
-    console.log(e.constructor.name)
-    console.log(typeof(e.message))
   if (!e.message.includes("charstring message"))
     throw new Error("incorrect exception message " + e.message);
   exception_thrown = true;
 }
 if (!exception_thrown)
   throw new Error("Should have thrown an exception");
+
+exception_thrown = false;
+try {
+  catches_strings.StringsThrower.stdstring();
+} catch (e) {
+  if (!e.message.includes("stdstring message"))
+    throw new Error("incorrect exception message " + e.message);
+  exception_thrown = true;
+}
+if (!exception_thrown)
+  throw new Error("Should have thrown an exception");

Examples/test-suite/lua/catches_strings_runme.lua

@@ -8,3 +8,6 @@ setmetatable(env, {__index=function (t,i) error("undefined global variable `"..i
 
 s, msg = pcall(function() catches_strings.StringsThrower.charstring() end)
 assert(s == false and msg:find("charstring message", 1, true))
+
+s, msg = pcall(function() catches_strings.StringsThrower.stdstring() end)
+assert(s == false and msg:find("stdstring message", 1, true))

Examples/test-suite/mzscheme/catches_strings_runme.scm

@@ -8,4 +8,11 @@
 (unless (string-contains? exception_thrown "charstring message")
   (error (format "incorrect exception message: ~a" exception_thrown)))
 
+(define exception_thrown "no exception thrown for kin")
+(with-handlers ([exn:fail? (lambda (exn)
+                             (set! exception_thrown (exn-message exn)))])
+  (StringsThrower-stdstring))
+(unless (string-contains? exception_thrown "stdstring message")
+  (error (format "incorrect exception message: ~a" exception_thrown)))
+
 (exit 0)

Examples/test-suite/ocaml/catches_strings_runme.ml

@@ -6,3 +6,9 @@ let _ =
     ignore (_StringsThrower_charstring (C_void)); assert false
   with Failure s ->
     assert (s = "charstring message")
+
+let _ =
+  try
+    ignore (_StringsThrower_stdstring (C_void)); assert false
+  with Failure s ->
+    assert (s = "stdstring message")

Examples/test-suite/octave/catches_strings_runme.m

@@ -17,3 +17,16 @@ end_try_catch
 if (!exception_thrown)
   error("Should have thrown an exception");
 endif
+
+exception_thrown = false;
+try
+  StringsThrower.stdstring();
+catch e
+  if (isempty(strfind(e.message, "stdstring message")))
+    error("incorrect exception message: %s", e.message)
+  endif
+  exception_thrown = true;
+end_try_catch
+if (!exception_thrown)
+  error("Should have thrown an exception");
+endif

Examples/test-suite/perl5/catches_strings_runme.pl

@@ -1,6 +1,6 @@
 use strict;
 use warnings;
-use Test::More tests => 3;
+use Test::More tests => 4;
 BEGIN { use_ok('catches_strings') }
 require_ok('catches_strings');
 
@@ -8,3 +8,8 @@ eval {
   catches_strings::StringsThrower::charstring();
 };
 like($@, qr/\bcharstring message/, "Should have thrown an exception");
+
+eval {
+  catches_strings::StringsThrower::stdstring();
+};
+like($@, qr/\bstdstring message/, "Should have thrown an exception");

Examples/test-suite/php/catches_strings_runme.php

@@ -11,4 +11,13 @@ try {
 }
 check::equal($exception_thrown, true, "Should have thrown an exception");
 
+$exception_thrown = false;
+try {
+  StringsThrower::stdstring();
+} catch (Exception $e) {
+  check::str_contains($e->getMessage(), "stdstring message", "incorrect exception message: {$e->getMessage()}");
+  $exception_thrown = true;
+}
+check::equal($exception_thrown, true, "Should have thrown an exception");
+
 check::done();

Examples/test-suite/python/catches_strings_runme.py

@@ -9,3 +9,13 @@ except RuntimeError as e:
     exception_thrown = True
 if not exception_thrown:
     raise RuntimeError("Should have thrown an exception")
+
+exception_thrown = False
+try:
+    StringsThrower.stdstring()
+except RuntimeError as e:
+    if "stdstring message" not in str(e):
+        raise RuntimeError("incorrect exception message:" + str(e))
+    exception_thrown = True
+if not exception_thrown:
+    raise RuntimeError("Should have thrown an exception")

Examples/test-suite/r/catches_strings_runme.R

@@ -13,3 +13,12 @@ tryCatch({
 }
 )
 unittest(exception_thrown, TRUE)
+
+exception_thrown = FALSE
+tryCatch({
+    StringsThrower_stdstring()
+}, error = function(e) {
+    exception_thrown <<- grepl(e$message, "stdstring message", fixed=TRUE)
+}
+)
+unittest(exception_thrown, TRUE)

Examples/test-suite/ruby/catches_strings_runme.rb

@@ -16,3 +16,16 @@ end
 if (!exception_thrown)
   raise RuntimeError, "Should have thrown an exception"
 end
+
+exception_thrown = false
+begin
+  Catches_strings::StringsThrower.stdstring()
+rescue RuntimeError => e
+  if (!e.to_s.include? "stdstring message")
+    raise RuntimeError, "incorrect exception message: #{e.to_s}"
+  end
+  exception_thrown = true
+end
+if (!exception_thrown)
+  raise RuntimeError, "Should have thrown an exception"
+end

Examples/test-suite/schemerunme/catches_strings.scm

@@ -2,4 +2,8 @@
               (StringsThrower-charstring))
 ; TODO: check the exception message
 
+(expect-throw 'swig-exception
+              (StringsThrower-stdstring))
+; TODO: check the exception message
+
 (exit 0)

Examples/test-suite/scilab/catches_strings_runme.sci

@@ -7,4 +7,11 @@ if (strstr(lasterror(), "charstring message") == '')
   exit(1)
 end
 
+ierr = execstr("StringsThrower_stdstring()", 'errcatch');
+checkequal(ierr, 20000, "wrong/no exception thrown")
+if (strstr(lasterror(), "stdstring message") == '')
+  printf("Should have thrown an exception")
+  exit(1)
+end
+
 exec("swigtest.quit", -1);

Examples/test-suite/tcl/catches_strings_runme.tcl

@@ -16,3 +16,16 @@ if [ catch {
 if {!$exception_thrown} {
   error "Should have thrown an exception"
 }
+
+set exception_thrown 0
+if [ catch {
+  StringsThrower_stdstring
+} e ] {
+  if {[string first "stdstring message" $e] == -1} {
+    error "incorrect exception message: $e"
+  }
+  set exception_thrown 1
+}
+if {!$exception_thrown} {
+  error "Should have thrown an exception"
+}

Lib/go/std_string.i

@@ -52,6 +52,9 @@ class string;
 %typemap(godirectorin,fragment="CopyString") string
 %{ $result = swigCopyString($input) %}
 
+%typemap(throws) string
+%{ _swig_gopanic($1.c_str()); %}
+
 %typemap(in) const string &
 %{
   $*1_ltype $1_str($input.p, $input.n);
@@ -88,6 +91,9 @@ class string;
 %typemap(godirectorin,fragment="CopyString") const string &
 %{ $result = swigCopyString($input) %}
 
+%typemap(throws) const string &
+%{ _swig_gopanic($1.c_str()); %}
+
 
 %typemap(gotype) string * "*string"
 

Lib/guile/std_string.i

@@ -83,4 +83,13 @@ namespace std {
         $result = SWIG_str02scm($1.c_str());
     }
 
+    %typemap(throws) string {
+      scm_throw(scm_from_locale_symbol((char *) "swig-exception"),
+                scm_list_n(SWIG_str02scm($1.c_str()), SCM_UNDEFINED));
+    }
+
+    %typemap(throws) const string & {
+      scm_throw(scm_from_locale_symbol((char *) "swig-exception"),
+                scm_list_n(SWIG_str02scm($1.c_str()), SCM_UNDEFINED));
+    }
 }

Lib/mzscheme/std_string.i

@@ -52,6 +52,13 @@ namespace std {
         $result = scheme_make_string($1->c_str());
     }
 
+    %typemap(throws) string {
+      scheme_signal_error("%s: %s", FUNC_NAME, $1.c_str());
+    }
+
+    %typemap(throws) const string & {
+      scheme_signal_error("%s: %s", FUNC_NAME, $1.c_str());
+    }
 }
 
 

Lib/scilab/std_string.i

@@ -37,3 +37,11 @@ SWIG_From_dec(std::string)(std::string pstValue) {
 }
 
 %include <typemaps/std_string.swg>
+
+%typemap(throws, noblock=1) std::string {
+  SWIG_Scilab_Raise_Ex($1.c_str(), "$type", $&descriptor);
+}
+
+%typemap(throws, noblock=1) const std::string & {
+  SWIG_Scilab_Raise_Ex($1.c_str(), "$type", $descriptor);
+}