- Do not bother to rename indices if object has no indices at all [Sheplyakov].

[ginac.git] / ginac / expairseq.cpp

diff --git a/ginac/expairseq.cpp b/ginac/expairseq.cpp
index 757f3c3989a62bf6b46378e41367a90974555010..788f7834f4a5fc82a1a713e1f770ecaa194abdb0 100644 (file)
--- a/ginac/expairseq.cpp
+++ b/ginac/expairseq.cpp
@@ -24,6 +24,7 @@
 #include <algorithm>
 #include <string>
 #include <stdexcept>
+#include <iterator>
 
 #include "expairseq.h"
 #include "lst.h"
@@ -267,8 +268,26 @@ void expairseq::do_print_tree(const print_tree & c, unsigned level) const
 
 bool expairseq::info(unsigned inf) const
 {
-       if (inf == info_flags::expanded)
-               return (flags & status_flags::expanded);
+       switch(inf) {
+               case info_flags::expanded:
+                       return (flags & status_flags::expanded);
+               case info_flags::has_indices: {
+                       if (flags & status_flags::has_indices)
+                               return true;
+                       else if (flags & status_flags::has_no_indices)
+                               return false;
+                       for (epvector::const_iterator i = seq.begin(); i != seq.end(); ++i) {
+                               if (i->rest.info(info_flags::has_indices)) {
+                                       this->setflag(status_flags::has_indices);
+                                       this->clearflag(status_flags::has_no_indices);
+                                       return true;
+                               }
+                       }
+                       this->clearflag(status_flags::has_indices);
+                       this->setflag(status_flags::has_no_indices);
+                       return false;
+               }
+       }
        return inherited::info(inf);
 }
 
@@ -793,8 +812,8 @@ void expairseq::construct_from_2_ex(const ex &lh, const ex &rh)
                                construct_from_2_ex_via_exvector(lh,rh);
                        } else {
 #endif // EXPAIRSEQ_USE_HASHTAB
-                               if(is_a<mul>(lh))
-                               {
+                               if (is_a<mul>(lh) && lh.info(info_flags::has_indices) && 
+                                       rh.info(info_flags::has_indices)) {
                                        ex newrh=rename_dummy_indices_uniquely(lh, rh);
                                        construct_from_2_expairseq(ex_to<expairseq>(lh),
                                                                   ex_to<expairseq>(newrh));
@@ -1038,6 +1057,7 @@ void expairseq::make_flat(const exvector &v)
        // and their cumulative number of operands
        int nexpairseqs = 0;
        int noperands = 0;
+       bool do_idx_rename = false;
        
        cit = v.begin();
        while (cit!=v.end()) {
@@ -1045,6 +1065,9 @@ void expairseq::make_flat(const exvector &v)
                        ++nexpairseqs;
                        noperands += ex_to<expairseq>(*cit).seq.size();
                }
+               if (is_a<mul>(*this) && (!do_idx_rename) &&
+                               cit->info(info_flags::has_indices))
+                       do_idx_rename = true;
                ++cit;
        }
        
@@ -1052,7 +1075,7 @@ void expairseq::make_flat(const exvector &v)
        seq.reserve(v.size()+noperands-nexpairseqs);
        
        // copy elements and split off numerical part
-       make_flat_inserter mf(v, this->tinfo() == &mul::tinfo_static);
+       make_flat_inserter mf(v, do_idx_rename);
        cit = v.begin();
        while (cit!=v.end()) {
                if (ex_to<basic>(*cit).tinfo()==this->tinfo()) {
@@ -1086,6 +1109,7 @@ void expairseq::make_flat(const epvector &v, bool do_index_renaming)
        // and their cumulative number of operands
        int nexpairseqs = 0;
        int noperands = 0;
+       bool really_need_rename_inds = false;
        
        cit = v.begin();
        while (cit!=v.end()) {
@@ -1093,8 +1117,12 @@ void expairseq::make_flat(const epvector &v, bool do_index_renaming)
                        ++nexpairseqs;
                        noperands += ex_to<expairseq>(cit->rest).seq.size();
                }
+               if ((!really_need_rename_inds) && is_a<mul>(*this) &&
+                               cit->rest.info(info_flags::has_indices))
+                       really_need_rename_inds = true;
                ++cit;
        }
+       do_index_renaming = do_index_renaming && really_need_rename_inds;
        
        // reserve seq and coeffseq which will hold all operands
        seq.reserve(v.size()+noperands-nexpairseqs);