Move seq_nielsen from src/ast/rewriter to src/smt/seq with new smt_seq component

Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>

src/CMakeLists.txt

@@ -53,6 +53,7 @@ add_subdirectory(ackermannization)
 add_subdirectory(ast/proofs)
 add_subdirectory(ast/fpa)
 add_subdirectory(smt/proto_model)
+add_subdirectory(smt/seq)
 add_subdirectory(smt)
 add_subdirectory(tactic/bv)
 add_subdirectory(smt/tactic)

src/ast/rewriter/CMakeLists.txt

@@ -39,7 +39,6 @@ z3_add_component(rewriter
     rewriter.cpp
     seq_axioms.cpp
     seq_eq_solver.cpp
-    seq_nielsen.cpp
     seq_rewriter.cpp
     seq_skolem.cpp
     th_rewriter.cpp

src/smt/seq/CMakeLists.txt

@@ -0,0 +1,7 @@
+z3_add_component(smt_seq
+  SOURCES
+    seq_nielsen.cpp
+  COMPONENT_DEPENDENCIES
+    euf
+    rewriter
+)

src/smt/seq/seq_nielsen.cpp

@@ -19,7 +19,7 @@ Author:
 
 --*/
 
-#include "ast/rewriter/seq_nielsen.h"
+#include "smt/seq/seq_nielsen.h"
 #include "ast/ast_pp.h"
 
 namespace seq {

src/smt/seq/seq_nielsen.h

@@ -11,7 +11,7 @@ Abstract:
 
     Ports the constraint types and Nielsen graph structures from
     ZIPT (https://github.com/CEisenhofer/ZIPT/tree/parikh/ZIPT/Constraints)
-    into Z3's rewriter framework.
+    into Z3's smt/seq framework.
 
     The Nielsen graph is used for solving word equations and regex
     membership constraints via Nielsen transformations. Each node

src/test/CMakeLists.txt

@@ -3,7 +3,7 @@ add_subdirectory(lp)
 ################################################################################
 # z3-test executable
 ################################################################################
-set(z3_test_deps api fuzzing simplex)
+set(z3_test_deps api fuzzing simplex smt_seq)
 z3_expand_dependencies(z3_test_expanded_deps ${z3_test_deps})
 set (z3_test_extra_object_files "")
 foreach (component ${z3_test_expanded_deps})

src/test/seq_nielsen.cpp

@@ -15,7 +15,7 @@ Abstract:
 
 #include "util/util.h"
 #include "ast/euf/euf_sgraph.h"
-#include "ast/rewriter/seq_nielsen.h"
+#include "smt/seq/seq_nielsen.h"
 #include "ast/reg_decl_plugins.h"
 #include "ast/ast_pp.h"
 #include <iostream>