Add support for consecutive function arg lists like f(1)(2), closes #179

Author: hsutter

regression-tests/pure2-repeated-call.cpp2

@@ -0,0 +1,5 @@
+
+main: () -> int = {
+    std::cout << std::hash<int>()(0) << std::endl;
+    return 0;
+}

regression-tests/test-results/clang-12/pure2-repeated-call.cpp.execution

@@ -0,0 +1 @@
+0

regression-tests/test-results/clang-12/pure2-repeated-call.cpp.output

@@ -0,0 +1 @@
+0

regression-tests/test-results/gcc-10/pure2-repeated-call.cpp.execution

@@ -0,0 +1 @@
+1268118805

regression-tests/test-results/gcc-10/pure2-repeated-call.cpp.output

@@ -0,0 +1 @@
+pure2-repeated-call.cpp

regression-tests/test-results/msvc-2022/pure2-repeated-call.cpp.execution

@@ -0,0 +1,17 @@
+// ----- Cpp2 support -----
+#define CPP2_USE_MODULES         Yes
+#include "cpp2util.h"
+
+
+#line 2 "pure2-repeated-call.cpp2"
+[[nodiscard]] auto main() -> int;
+
+//=== Cpp2 definitions ==========================================================
+
+#line 1 "pure2-repeated-call.cpp2"
+
+[[nodiscard]] auto main() -> int{
+    std::cout << std::hash<int>()(0) << std::endl;
+    return 0; 
+}
+

regression-tests/test-results/msvc-2022/pure2-repeated-call.cpp.output

@@ -0,0 +1,2 @@
+pure2-repeated-call.cpp2... ok (all Cpp2, passes safety checks)
+

regression-tests/test-results/pure2-repeated-call.cpp

@@ -1741,6 +1741,17 @@ class cppfront
 
         auto args = std::optional<text_chunks_with_parens_position>{};
 
+        auto flush_args = [&] {
+            if (args) {
+                suffix.emplace_back(")", args.value().close_pos);
+                for (auto&& e: args.value().text_chunks) {
+                    suffix.push_back(e);
+                }
+                suffix.emplace_back("(", args.value().open_pos);
+                args.reset();
+            }
+        };
+
         auto print_to_string = [&](auto& i, auto... more) {
             auto print = std::string{};
             printer.emit_to_string(&print);
@@ -1793,7 +1804,8 @@ class cppfront
                 if (!i->expr_list->expressions.empty()) {
                     local_args.text_chunks = print_to_text_chunks(*i->expr_list);
                 } 
-                
+
+                flush_args();
                 args.emplace(std::move(local_args));
             }
             // Going backwards if we found Dot and there is args variable
@@ -1933,17 +1945,7 @@ class cppfront
         }
         suppress_move_from_last_use = false;
 
-        if (args) {
-            // if after printing core expression args is defined
-            // it means that the chaining started by function call
-            // we need to print its arguments
-            suffix.emplace_back(")", args.value().close_pos);
-            for (auto&& e: args.value().text_chunks) {
-                suffix.push_back(e);
-            }
-            suffix.emplace_back("(", args.value().open_pos);
-            args.reset();
-        }
+        flush_args();
 
         //  Print the suffixes (in reverse order)
         while (!suffix.empty()) {