Function format_syntax_error_location

gjs/jsapi-util.cpp:424–460

Helper function: format the file name, line number, and column number where a SyntaxError occurred.

// Helper function: format the file name, line number, and column number where a
// SyntaxError occurred.
static std::string format_syntax_error_location(JSContext* cx,
                                                JS::HandleObject exc) {
    const GjsAtoms& atoms = GjsContextPrivate::atoms(cx);

    JS::RootedValue property(cx);
    int32_t line = 0;
    if (JS_GetPropertyById(cx, exc, atoms.line_number(), &property)) {
        if (property.isInt32())
            line = property.toInt32();
    }
    log_exception_brief(cx);

    int32_t column = 0;
    if (JS_GetPropertyById(cx, exc, atoms.column_number(), &property)) {
        if (property.isInt32())
            column = property.toInt32();
    }
    log_exception_brief(cx);

    JS::UniqueChars utf8_filename;
    if (JS_GetPropertyById(cx, exc, atoms.file_name(), &property)) {
        if (property.isString()) {
            JS::RootedString str(cx, property.toString());
            utf8_filename = JS_EncodeStringToUTF8(cx, str);
        }
    }
    log_exception_brief(cx);

    std::ostringstream out;
    out << " @ ";
    if (utf8_filename)
        out << utf8_filename.get();
    else
        out << "<unknown>";
    out << ":" << line << ":" << column;
    return out.str();
}

using CauseSet = JS::GCHashSet<JSObject*, js::DefaultHasher<JSObject*>,
                               js::SystemAllocPolicy>;