Cleanup formcalc method generationchromium/3427

This CL simplifies the FormCalc method call generation when converted to
JavaScript. Currently we output the same chunk of code to run the
given method on an array or object per method call. This CL pulls out
the common execution code to a pfm_method_runner function which is used
instead.

An embedder test has been added to verify that method invocation from
formcalc works correctly.

Bug: chromium:814848
Change-Id: I1ec052eab051053fedcb464d57e0e15228b8c5a2
Reviewed-on: https://pdfium-review.googlesource.com/32372
Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
Commit-Queue: dsinclair <dsinclair@chromium.org>

1 files changed, 10 insertions, 1 deletions

diff --git a/xfa/fxfa/fm2js/cxfa_fmexpression.cpp b/xfa/fxfa/fm2js/cxfa_fmexpression.cpp
index a3c65a2203..ef2153d6be 100644
--- a/xfa/fxfa/fm2js/cxfa_fmexpression.cpp
+++ b/xfa/fxfa/fm2js/cxfa_fmexpression.cpp
@@ -89,6 +89,16 @@ bool CXFA_FMAST::ToJavaScript(CFX_WideTextBuf& js) {
   }
 
   js << L"(function() {\n";
+  js << L"let pfm_method_runner = function(obj, cb) {\n";
+  js << L"  if (pfm_rt.is_ary(obj)) {\n";
+  js << L"    let pfm_method_return = null;\n";
+  js << L"    for (var idx = obj.length -1; idx > 1; idx--) {\n";
+  js << L"      pfm_method_return = cb(obj[idx]);\n";
+  js << L"    }\n";
+  js << L"    return pfm_method_return;\n";
+  js << L"  }\n";
+  js << L"  return cb(obj);\n";
+  js << L"};\n";
   js << L"var pfm_ret = null;\n";
 
   for (const auto& expr : expressions_) {
@@ -100,7 +110,6 @@ bool CXFA_FMAST::ToJavaScript(CFX_WideTextBuf& js) {
 
   js << L"return pfm_rt.get_val(pfm_ret);\n";
   js << L"}).call(this);";
-
   return !CXFA_IsTooBig(js);
 }