Embind: Add UNO char support

Change-Id: I4ced49774baafdf620ae167c53794932766aca86
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/163741
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <stephan.bergmann@allotropia.de>

4 files changed, 46 insertions, 0 deletions

diff --git a/static/source/unoembindhelpers/PrimaryBindings.cxx b/static/source/unoembindhelpers/PrimaryBindings.cxx
index 0a27162c3ef1..a8e1000afd6f 100644
--- a/static/source/unoembindhelpers/PrimaryBindings.cxx
+++ b/static/source/unoembindhelpers/PrimaryBindings.cxx
@@ -23,6 +23,39 @@
 using namespace emscripten;
 using namespace css::uno;
 
+EM_JS(void, jsRegisterChar, (std::type_info const* raw),
+// clang-format off
+{
+    Module.registerType(raw, {
+        name: 'rtl::OUString',
+        fromWireType(ptr) {
+            let str = String.fromCharCode(Module.HEAPU16[ptr >> 1]);
+            return str;
+        },
+        toWireType(destructors, value) {
+            if (typeof value != 'string' || value.length !== 1) {
+                Module.throwBindingError(
+                    'Cannot pass anything but 1-element string to C++ char16_t');
+            }
+            let data = Module._malloc(2);
+            Module.HEAPU16[data >> 1] = value.charCodeAt(0);
+            if (destructors !== null) {
+                destructors.push(Module._free, data);
+            }
+            return data;
+        },
+        argPackAdvance: 8,
+        readValueFromPointer(pointer) {
+            return this.fromWireType(Module.HEAPU32[((pointer)>>2)]);
+        },
+        destructorFunction(ptr) {
+            Module._free(ptr);
+        },
+    });
+}
+// clang-format on
+);
+
 #pragma clang diagnostic push
 #pragma clang diagnostic ignored "-Winvalid-pp-token"
 EM_JS(void, jsRegisterString, (std::type_info const* raw),
@@ -167,6 +200,7 @@ EMSCRIPTEN_BINDINGS(PrimaryBindings)
     function("rtl_uString_release",
              +[](std::uintptr_t ptr) { rtl_uString_release(reinterpret_cast<rtl_uString*>(ptr)); });
 
+    jsRegisterChar(&typeid(char16_t));
     jsRegisterString(&typeid(OUString));
 }
 #endif
diff --git a/unotest/source/embindtest/embindtest.cxx b/unotest/source/embindtest/embindtest.cxx
index b1f819272931..9ab70656541d 100644
--- a/unotest/source/embindtest/embindtest.cxx
+++ b/unotest/source/embindtest/embindtest.cxx
@@ -68,6 +68,10 @@ public:
 
     sal_Bool SAL_CALL isDouble(double value) override { return value == 100.5; }
 
+    sal_Unicode SAL_CALL getChar() override { return u'Ö'; }
+
+    sal_Bool SAL_CALL isChar(sal_Unicode value) override { return value == u'Ö'; }
+
     OUString SAL_CALL getString() override { return u"hä"_ustr; }
 
     sal_Bool SAL_CALL isString(OUString const& value) override { return value == u"hä"; }
diff --git a/unotest/source/embindtest/embindtest.idl b/unotest/source/embindtest/embindtest.idl
index 913cde39e12b..09e5c4096c50 100644
--- a/unotest/source/embindtest/embindtest.idl
+++ b/unotest/source/embindtest/embindtest.idl
@@ -36,6 +36,8 @@ interface XTest {
     boolean isFloat([in] float value);
     double getDouble();
     boolean isDouble([in] double value);
+    char getChar();
+    boolean isChar([in] char value);
     string getString();
     boolean isString([in] string value);
     Struct getStruct();
diff --git a/unotest/source/embindtest/embindtest.js b/unotest/source/embindtest/embindtest.js
index 805dd16bfe99..9d0349ffe7f2 100644
--- a/unotest/source/embindtest/embindtest.js
+++ b/unotest/source/embindtest/embindtest.js
@@ -74,6 +74,12 @@ Module.addOnPostRun(function() {
         console.assert(test.isDouble(v));
     }
     {
+        let v = test.getChar();
+        console.log(v);
+        console.assert(v === 'Ö');
+        console.assert(test.isChar(v));
+    }
+    {
         let v = test.getString();
         console.log(v);
         console.assert(v === 'hä');