commit 15d83f8e020cb486dfb1a4eeee76c043f680dac7
Author: Tanmai Khanna <khanna.tanmai@gmail.com>
Date:   Mon Jul 20 12:04:07 2020 +0530

    if input chunk in postchunk rule has one LU, blank outputs on all LUs in rule output | fix output blank in postchunk | add tests

diff --git a/apertium/postchunk.cc b/apertium/postchunk.cc
index 7e432da..13c35ef 100644
--- a/apertium/postchunk.cc
+++ b/apertium/postchunk.cc
@@ -489,7 +489,7 @@ Postchunk::evalString(xmlNode *element)
     
     if(lword == 1)
     {
-      out_wblank = word[0]->getBlank();
+      out_wblank = word[1]->getBlank();
     }
 
     if(myword != "")
@@ -547,7 +547,7 @@ Postchunk::evalString(xmlNode *element)
     
     if(lword == 1)
     {
-      out_wblank = word[0]->getBlank();
+      out_wblank = word[1]->getBlank();
     }
 
     if(value != "")
@@ -594,7 +594,7 @@ Postchunk::processOut(xmlNode *localroot)
         
         if(lword == 1)
         {
-          out_wblank = word[0]->getBlank();
+          out_wblank = word[1]->getBlank();
         }
         
         if(myword != "")
@@ -649,7 +649,7 @@ Postchunk::processOut(xmlNode *localroot)
         
         if(lword == 1)
         {
-          out_wblank = word[0]->getBlank();
+          out_wblank = word[1]->getBlank();
         }
 
         fputws_unlocked(UtfConverter::fromUtf8(out_wblank).c_str(), output);
diff --git a/apertium/postchunk.h b/apertium/postchunk.h
index 5a92234..1a1e14d 100644
--- a/apertium/postchunk.h
+++ b/apertium/postchunk.h
@@ -56,6 +56,7 @@ private:
   InterchunkWord **word;
   string **blank;
   int lword, lblank;
+  int last_lword;
   Buffer<TransferToken> input_buffer;
   vector<wstring *> tmpword;
   vector<wstring *> tmpblank;
diff --git a/apertium/transfer.cc b/apertium/transfer.cc
index ad6d8db..aceab04 100644
--- a/apertium/transfer.cc
+++ b/apertium/transfer.cc
@@ -54,6 +54,7 @@ word(0),
 blank(0),
 lword(0),
 lblank(0),
+last_lword(0),
 output(0),
 any_char(0),
 any_tag(0),
diff --git a/tests/data/apertium-nno-nob.nno-nob.t3x b/tests/data/apertium-nno-nob.nno-nob.t3x
index a52713d..df91750 100644
--- a/tests/data/apertium-nno-nob.nno-nob.t3x
+++ b/tests/data/apertium-nno-nob.nno-nob.t3x
@@ -17,6 +17,9 @@
     <def-cat n="n_n">
       <cat-item name="n_n"/>
     </def-cat>
+    <def-cat n="thing_wb">
+      <cat-item name="thing_wb"/>
+    </def-cat>
   </section-def-cats>
 
 
@@ -155,5 +158,24 @@
       </action>
     </rule>
 
+    <rule comment="CHUNK: thing_wblank">
+      <pattern>
+        <pattern-item n="thing_wb"/>
+      </pattern>
+      <action>
+        <call-macro n="default_to_chunk_number"><with-param pos="1"/><with-param pos="0"/></call-macro>
+        <out>
+          <lu><concat><lit v="newthing"/><lit-tag v="adj.sg"/></concat></lu>
+          <b/>
+          <lu><clip pos="1" part="whole"/></lu>
+          <b/>
+          <mlu>
+            <lu><clip pos="1" part="whole"/></lu>
+            <lu><concat><lit v="newpr"/><lit-tag v="pr"/></concat></lu>
+          </mlu>
+        </out>
+      </action>
+    </rule>
+
   </section-rules>
 </postchunk>
diff --git a/tests/postchunk/__init__.py b/tests/postchunk/__init__.py
index 52c9ef3..e83de7f 100644
--- a/tests/postchunk/__init__.py
+++ b/tests/postchunk/__init__.py
@@ -111,6 +111,9 @@ class WordboundBlankTest(PostchunkTest):
     inputs =          ["^n_n<SN><sg>{[[t:b:123456]]^worda<n><ND><m>$ ;[testblank] [[t:s:xyzab12]]^wordb# xyz<n><ND><f>$}$"]
     expectedOutputs = ["[[t:s:xyzab12]]^wordb# xyz<n><ND><f>$ ;[testblank] [[t:b:123456]]^worda<n><ND><m>$ [[t:b:123456; t:s:xyzab12]]^worda+wordb# xyz$"]
 
+class SingleLUWordboundBlankTest(PostchunkTest):
+    inputs =          ["^thing_wb<thing><sg>{^[[t:i:xyzabc]]thing<thing><ND>$}$ ^n_n<SN><sg>{[[t:b:123456]]^worda<n><ND><m>$ ;[testblank] [[t:s:xyzab12]]^wordb# xyz<n><ND><f>$}$ [blanks] ^thing_wb<thing><sg>{^[[t:i:xyzabc]]thing<thing><ND>$}$ [blankx] ^vblex<vblex><imp>{[[t:b:123zbc]]^gå<vblex><imp>$}$^default<default>{^.<sent><clb>$}$ [blanks3] ^thing<thing><sg>{^[[t:i:xyzabc]]thing<thing><ND>$}$"]
+    expectedOutputs = ["[[t:i:xyzabc]]^newthing<adj><sg>$ [[t:i:xyzabc]]^thing<thing><sg>$ [[t:i:xyzabc]]^thing<thing><sg>+newpr<pr>$ [[t:s:xyzab12]]^wordb# xyz<n><ND><f>$ ;[testblank] [[t:b:123456]]^worda<n><ND><m>$ [[t:b:123456; t:s:xyzab12]]^worda+wordb# xyz$ [blanks] [[t:i:xyzabc]]^newthing<adj><sg>$ [[t:i:xyzabc]]^thing<thing><sg>$ [[t:i:xyzabc]]^thing<thing><sg>+newpr<pr>$ [blankx] [[t:b:123zbc]]^gå<vblex><imp>$^.<sent><clb>$ [blanks3] [[t:i:xyzabc]]^thing<thing><sg>$"]
 class BincompatTest(SimplePostchunkTest):
     bindata = "data/bincompat.t3x.bin"