libfyaml backend

currently it simply converts the whole file content to flow mode.
The nice thing is: It can convert EVERYTHING to flow mode. libfyaml is
the only library that passes the whole YAML test suite

CMakeLists.txt

@@ -116,7 +116,13 @@ if(CMAKE_BUILD_TYPE STREQUAL "DEBUG")
 endif()
 
 set(CMAKE_Fortran_FLAGS_${CMAKE_BUILD_TYPE} "${CMAKE_Fortran_FLAGS_${CMAKE_BUILD_TYPE}} ${PETSC_INCLUDES} ${BUILDCMD_POST}")
-set(CMAKE_Fortran_LINK_EXECUTABLE             "${CMAKE_Fortran_LINK_EXECUTABLE} <OBJECTS> -o <TARGET> <LINK_LIBRARIES> -L${PETSC_LIBRARY_DIRS} -lpetsc ${PETSC_EXTERNAL_LIB} -lz ${BUILDCMD_POST}")
+
+set(CMAKE_Fortran_LINK_EXECUTABLE "${CMAKE_Fortran_LINK_EXECUTABLE} <OBJECTS> -o <TARGET> <LINK_LIBRARIES> -L${PETSC_LIBRARY_DIRS} -lpetsc ${PETSC_EXTERNAL_LIB} -lz")
+if(fYAML_FOUND STREQUAL "1")
+    set(CMAKE_Fortran_LINK_EXECUTABLE "${CMAKE_Fortran_LINK_EXECUTABLE} -L${fYAML_LIBRARY_DIRS} -l${fYAML_LIBRARIES}")
+    add_definitions(-DFYAML)
+endif()
+set(CMAKE_Fortran_LINK_EXECUTABLE "${CMAKE_Fortran_LINK_EXECUTABLE} ${BUILDCMD_POST}")
 
 message("Fortran Compiler Flags:\n${CMAKE_Fortran_FLAGS_${CMAKE_BUILD_TYPE}}\n")
 message("C Compiler Flags:\n${CMAKE_C_FLAGS_${CMAKE_BUILD_TYPE}}\n")

src/C_routines.c

@@ -9,6 +9,10 @@
 #include <sys/stat.h>
 #include "zlib.h"
 
+#ifdef FYAML
+#include <libfyaml.h>
+#endif
+
 #define PATHLEN 4096
 #define STRLEN   256
 
@@ -80,3 +84,26 @@ void inflate_c(const uLong *s_deflated, const uLong *s_inflated, const Byte defl
     }
   }
 }
+
+#ifdef FYAML
+void to_flow_c(char **flow, int* length_flow, const char *mixed){
+  struct fy_document *fyd = NULL;
+  enum fy_emitter_cfg_flags emit_flags = FYECF_MODE_FLOW_ONELINE | FYECF_STRIP_LABELS | FYECF_STRIP_DOC;
+
+  fyd = fy_document_build_from_string(NULL, mixed, -1);
+  if (!fyd) {
+    *length_flow = -1;
+    return;
+  }
+  int err = fy_document_resolve(fyd);
+  if (err) {
+    *length_flow = -1;
+    return;
+  }
+
+  *flow = fy_emit_document_to_string(fyd,emit_flags);
+  *length_flow = strlen(*flow);
+
+  fy_document_destroy(fyd);
+}
+#endif

src/IO.f90

@@ -483,7 +483,9 @@ subroutine IO_error(error_ID,el,ip,g,instance,ext_msg)
     case (701)
       msg = 'Incorrect indent/Null value not allowed'
     case (702)
-      msg = 'Invalid use of flow yaml'
+      msg = 'Invalid use of flow YAML'
+    case (703)
+      msg = 'Invalid YAML'
     case (704)
       msg = 'Space expected after a colon for <key>: <value> pair'
     case (705)

src/YAML_parse.f90

@@ -8,6 +8,9 @@ module YAML_parse
   use prec
   use IO
   use YAML_types
+#ifdef FYAML
+  use system_routines
+#endif
 
   implicit none
   private
@@ -16,14 +19,34 @@ module YAML_parse
     YAML_parse_init, &
     YAML_parse_str
 
+#ifdef FYAML
+  interface
+
+    subroutine to_flow_C(flow,length_flow,mixed) bind(C)
+      use, intrinsic :: ISO_C_Binding, only: C_INT, C_CHAR, C_PTR
+
+      type(C_PTR), intent(out) :: flow
+      integer(C_INT), intent(out) :: length_flow
+      character(kind=C_CHAR), dimension(*), intent(in) :: mixed
+    end subroutine to_flow_C
+
+  end interface
+#endif
+
+
 contains
 
 !--------------------------------------------------------------------------------------------------
 !> @brief Do sanity checks.
 !--------------------------------------------------------------------------------------------------
-subroutine YAML_parse_init
+subroutine YAML_parse_init()
 
-  call selfTest
+  print'(/,1x,a)', '<<<+-  YAML_parse init  -+>>>'
+#ifdef FYAML
+  print'(/,1x,a)', 'libfyaml powered'
+#else
+  call selfTest()
+#endif
 
 end subroutine YAML_parse_init
 
@@ -155,8 +178,37 @@ logical function quotedString(line)
 end function quotedString
 
 
+#ifdef FYAML
 !--------------------------------------------------------------------------------------------------
-! @brief Returns Indentation.
+! @brief Convert all block style YAML parts to flow style.
+!--------------------------------------------------------------------------------------------------
+function to_flow(mixed) result(flow)
+
+  character(len=*), intent(in) :: mixed
+  character(:,C_CHAR), allocatable :: flow
+
+  type(C_PTR) :: str_ptr
+  integer(C_INT) :: strlen
+
+
+  call to_flow_C(str_ptr,strlen,f_c_string(mixed))
+  if (strlen < 1) call IO_error(703,ext_msg='libyfaml')
+  allocate(character(len=strlen,kind=c_char) :: flow)
+
+  block
+    character(len=strlen,kind=c_char), pointer :: s
+    call c_f_pointer(str_ptr,s)
+    flow = s
+  end block
+
+  call free_C(str_ptr)
+
+end function to_flow
+
+
+#else
+!--------------------------------------------------------------------------------------------------
+! @brief Determine Indentation.
 ! @details It determines the indentation level for a given block/line.
 ! In cases for nested lists, an offset is added to determine the indent of the item block (skip
 ! leading dashes)
@@ -737,7 +789,7 @@ end subroutine
 
 
 !--------------------------------------------------------------------------------------------------
-! @brief convert all block style YAML parts to flow style
+! @brief Convert all block style YAML parts to flow style.
 !--------------------------------------------------------------------------------------------------
 function to_flow(blck)
 
@@ -921,5 +973,6 @@ subroutine selfTest
   end block basic_mixed
 
 end subroutine selfTest
+#endif
 
 end module YAML_parse

src/system_routines.f90

@@ -17,7 +17,9 @@ module system_routines
     getUserName, &
     signalterm_C, &
     signalusr1_C, &
-    signalusr2_C
+    signalusr2_C, &
+    f_c_string, &
+    free_C
 
 
   interface
@@ -71,6 +73,12 @@ module system_routines
       type(C_FUNPTR), intent(in), value :: handler
     end subroutine signalusr2_C
 
+    subroutine free_C(ptr) bind(C,name='free')
+      import c_ptr
+      type(c_ptr), value :: ptr
+    end subroutine free_C
+
+
   end interface
 
 contains