refactor(frontends/lean): move placeholder_elaborator to library/tactic

src/frontends/lean/CMakeLists.txt

@@ -3,12 +3,10 @@ token_table.cpp scanner.cpp parse_table.cpp parser_config.cpp
 parser.cpp parser_pos_provider.cpp builtin_cmds.cpp builtin_exprs.cpp
 server.cpp notation_cmd.cpp calc.cpp decl_cmds.cpp util.cpp
 inductive_cmd.cpp elaborator.cpp dependencies.cpp parser_bindings.cpp
-begin_end_ext.cpp class.cpp tactic_hint.cpp pp.cpp
-theorem_queue.cpp structure_cmd.cpp info_manager.cpp
-info_annotation.cpp find_cmd.cpp placeholder_elaborator.cpp
+begin_end_ext.cpp class.cpp tactic_hint.cpp pp.cpp theorem_queue.cpp
+structure_cmd.cpp info_manager.cpp info_annotation.cpp find_cmd.cpp
 coercion_elaborator.cpp info_tactic.cpp proof_qed_elaborator.cpp
 init_module.cpp elaborator_context.cpp calc_proof_elaborator.cpp
 type_util.cpp elaborator_exception.cpp)
 
-
 target_link_libraries(lean_frontend ${LEAN_LIBS})

src/frontends/lean/elaborator.cpp

@@ -36,6 +36,7 @@ Author: Leonardo de Moura
 #include "library/choice_iterator.h"
 #include "library/pp_options.h"
 #include "library/tactic/expr_to_tactic.h"
+#include "library/tactic/placeholder_elaborator.h"
 #include "library/error_handling/error_handling.h"
 #include "library/definitional/equations.h"
 #include "frontends/lean/local_decls.h"
@@ -44,7 +45,6 @@ Author: Leonardo de Moura
 #include "frontends/lean/info_manager.h"
 #include "frontends/lean/info_annotation.h"
 #include "frontends/lean/elaborator.h"
-#include "frontends/lean/placeholder_elaborator.h"
 #include "frontends/lean/proof_qed_elaborator.h"
 #include "frontends/lean/calc_proof_elaborator.h"
 #include "frontends/lean/info_tactic.h"

src/frontends/lean/init_module.cpp

@@ -21,7 +21,6 @@ Author: Leonardo de Moura
 #include "frontends/lean/parse_table.h"
 #include "frontends/lean/token_table.h"
 #include "frontends/lean/info_tactic.h"
-#include "frontends/lean/placeholder_elaborator.h"
 #include "frontends/lean/calc_proof_elaborator.h"
 #include "frontends/lean/find_cmd.h"
 #include "frontends/lean/scanner.h"
@@ -49,7 +48,6 @@ void initialize_frontend_lean_module() {
     initialize_info_manager();
     initialize_info_tactic();
     initialize_pp();
-    initialize_placeholder_elaborator();
     initialize_calc_proof_elaborator();
     initialize_server();
     initialize_find_cmd();
@@ -58,7 +56,6 @@ void finalize_frontend_lean_module() {
     finalize_find_cmd();
     finalize_server();
     finalize_calc_proof_elaborator();
-    finalize_placeholder_elaborator();
     finalize_pp();
     finalize_info_tactic();
     finalize_info_manager();

src/library/tactic/CMakeLists.txt

@@ -3,6 +3,6 @@ apply_tactic.cpp intros_tactic.cpp rename_tactic.cpp trace_tactic.cpp
 exact_tactic.cpp unfold_tactic.cpp generalize_tactic.cpp
 inversion_tactic.cpp whnf_tactic.cpp revert_tactic.cpp
 assert_tactic.cpp clear_tactic.cpp expr_to_tactic.cpp util.cpp
-init_module.cpp)
+placeholder_elaborator.cpp init_module.cpp)
 
 target_link_libraries(tactic ${LEAN_LIBS})

src/library/tactic/init_module.cpp

@@ -19,6 +19,7 @@ Author: Leonardo de Moura
 #include "library/tactic/revert_tactic.h"
 #include "library/tactic/inversion_tactic.h"
 #include "library/tactic/assert_tactic.h"
+#include "library/tactic/placeholder_elaborator.h"
 
 namespace lean {
 void initialize_tactic_module() {
@@ -37,9 +38,11 @@ void initialize_tactic_module() {
     initialize_revert_tactic();
     initialize_inversion_tactic();
     initialize_assert_tactic();
+    initialize_placeholder_elaborator();
 }
 
 void finalize_tactic_module() {
+    finalize_placeholder_elaborator();
     finalize_assert_tactic();
     finalize_inversion_tactic();
     finalize_revert_tactic();

src/library/tactic/placeholder_elaborator.cpp

@@ -20,7 +20,8 @@ Author: Leonardo de Moura
 #include "library/choice_iterator.h"
 #include "library/pp_options.h"
 #include "library/generic_exception.h"
-#include "frontends/lean/util.h"
+#include "library/util.h"
+#include "library/tactic/util.h"
 
 #ifndef LEAN_DEFAULT_CLASS_UNIQUE_CLASS_INSTANCES
 #define LEAN_DEFAULT_CLASS_UNIQUE_CLASS_INSTANCES false

src/library/tactic/placeholder_elaborator.h

@@ -7,6 +7,7 @@ Author: Leonardo de Moura
 #pragma once
 #include "kernel/expr.h"
 #include "library/io_state.h"
+#include "library/unifier.h"
 #include "library/local_context.h"
 
 namespace lean {