type, public :: json_file

The json_file is the main public class that is used to open a file and get data from it.

Example

    program test
    use json_module
    implicit none
    type(json_file) :: json
    integer :: ival
    real(real64) :: rval
    character(len=:),allocatable :: cval
    logical :: found
    call json_initialize()
    call json%load_file(filename='myfile.json')
    call json%print_file() !print to the console
    call json%get('var.i',ival,found)
    call json%get('var.r(3)',rval,found)
    call json%get('var.c',cval,found)
    call json%destroy()
    end program test

Components

Type	Visibility	Attributes		Name		Initial
type(json_value),	private,	pointer	::	p	=>	null()	the JSON structure read from the file

Constructor

private interface json_file

Structure constructor to initialize a json_file object with an existing json_value object

private function initialize_json_file(p) result(file_object)

Arguments

Type Intent Optional Attributes Name

type(json_value), intent(in), optional pointer :: p
json_value object to cast as a json_file object

Return Value type(json_file)

Description

Author
Izaak Beekman

Date
07/23/2015

Cast a json_value object as a json_file object

Type	Intent	Optional	Attributes		Name
type(json_value),	intent(in),	optional	pointer	::	p	`json_value` object to cast as a `json_file` object

Type-Bound Procedures

procedure, public :: load_file => json_file_load

private subroutine json_file_load(me, filename, unit)

Arguments

Type	Intent	Optional		Name
class(json_file),	intent(inout)		::	me
character(kind=CDK,len=*),	intent(in)		::	filename	the filename to open
integer(kind=IK),	intent(in),	optional	::	unit	the unit number to use (if not present, a newunit is used)

Description

Author: Jacob Williams
Date: 12/9/2013

Load the JSON data from a file.

generic, public :: load_from_string => json_file_load_from_string

private subroutine json_file_load_from_string(me, str)

Arguments

Type	Intent	Optional	Attributes		Name
class(json_file),	intent(inout)			::	me
character(kind=CK,len=*),	intent(in)			::	str	string to load JSON data from

Description

Author: Jacob Williams
Date: 1/13/2015

Load the JSON data from a string.

procedure, public :: destroy => json_file_destroy

private subroutine json_file_destroy(me)

Arguments

Type Intent Optional Attributes Name

class(json_file), intent(inout) :: me

Description

Author
Jacob Williams

Date
12/9/2013

Destroy the json_file.

procedure, public :: move => json_file_move_pointer

private subroutine json_file_move_pointer(to, from)

Arguments

Type Intent Optional Attributes Name

class(json_file), intent(inout) :: to

class(json_file), intent(inout) :: from

Description

Author
Jacob Williams

Date
12/5/2014

Move the json_value pointer from one json_file to another. The "from" pointer is then nullified, but not destroyed.

Type	Intent	Optional	Attributes		Name
class(json_file),	intent(inout)			::	to
class(json_file),	intent(inout)			::	from

generic, public :: info => json_file_variable_info

private subroutine json_file_variable_info(me, path, found, var_type, n_children)

Arguments

Type	Intent		Name
class(json_file),	intent(inout)	::	me
character(kind=CK,len=*),	intent(in)	::	path	path to the variable
logical(kind=LK),	intent(out)	::	found	the variable exists in the structure
integer(kind=IK),	intent(out)	::	var_type	variable type
integer(kind=IK),	intent(out)	::	n_children	number of children

Description

Author: Jacob Williams
Date: 2/3/2014

Returns information about a variable in a json_file.

procedure, public :: print_to_string => json_file_print_to_string

private subroutine json_file_print_to_string(me, str)

Arguments

Type	Intent	Optional	Attributes		Name
class(json_file),	intent(inout)			::	me
character(kind=CK,len=:),	intent(out),		allocatable	::	str	string to print JSON data to

Description

Author: Jacob Williams
Date: 1/11/2015

Print the JSON file to a string.

generic, public :: print_file => json_file_print_to_console, json_file_print_1, json_file_print_2

private subroutine json_file_print_to_console(me)

Arguments

Type Intent Optional Attributes Name

class(json_file), intent(inout) :: me

Description

Author
Jacob Williams

Date
1/11/2015

Print the JSON file to the console.

private subroutine json_file_print_1(me, iunit)

Arguments

Type	Intent	Optional	Attributes		Name
class(json_file),	intent(inout)			::	me
integer(kind=IK),	intent(in)			::	iunit	file unit number (must not be -1)

Description

Author: Jacob Williams
Date: 12/9/2013

Prints the JSON file to the specified file unit number.

private subroutine json_file_print_2(me, filename)

Arguments

Type	Intent	Optional	Attributes		Name
class(json_file),	intent(inout)			::	me
character(kind=CDK,len=*),	intent(in)			::	filename	filename to print to

Description

Author: Jacob Williams
Date: 1/11/2015

Print the JSON structure to the specified filename. The file is opened, printed, and then closed.

generic, public :: get => json_file_get_object, json_file_get_integer, json_file_get_double, json_file_get_logical, json_file_get_string, json_file_get_integer_vec, json_file_get_double_vec, json_file_get_logical_vec, json_file_get_string_vec, json_file_get_root

private subroutine json_file_get_object(me, path, p, found)

Arguments

Type	Intent	Optional	Attributes		Name
class(json_file),	intent(inout)			::	me
character(kind=CK,len=*),	intent(in)			::	path	the path to the variable
type(json_value),	intent(out),		pointer	::	p	pointer to the variable
logical(kind=LK),	intent(out),	optional		::	found	if it was really found

Description

Author: Jacob Williams
Date: 2/3/2014

Get a json_value pointer to an object from a JSON file.

private subroutine json_file_get_integer(me, path, val, found)

Arguments

Type	Intent	Optional		Name
class(json_file),	intent(inout)		::	me
character(kind=CK,len=*),	intent(in)		::	path	the path to the variable
integer(kind=IK),	intent(out)		::	val	value
logical(kind=LK),	intent(out),	optional	::	found	if it was really found

Description

Author: Jacob Williams
Date: 12/9/2013

Get an integer value from a JSON file.

private subroutine json_file_get_double(me, path, val, found)

Arguments

Type	Intent	Optional		Name
class(json_file),	intent(inout)		::	me
character(kind=CK,len=*),	intent(in)		::	path
real(kind=RK),	intent(out)		::	val
logical(kind=LK),	intent(out),	optional	::	found

Description

Author: Jacob Williams
Date: 12/9/2013

Get a real(RK) variable value from a JSON file.

private subroutine json_file_get_logical(me, path, val, found)

Arguments

Type	Intent	Optional		Name
class(json_file),	intent(inout)		::	me
character(kind=CK,len=*),	intent(in)		::	path
logical(kind=LK),	intent(out)		::	val
logical(kind=LK),	intent(out),	optional	::	found

Description

Author: Jacob Williams
Date: 12/9/2013

Get a logical(LK) value from a JSON file.

private subroutine json_file_get_string(me, path, val, found)

Arguments

Type	Intent	Optional	Attributes		Name
class(json_file),	intent(inout)			::	me
character(kind=CK,len=*),	intent(in)			::	path
character(kind=CK,len=:),	intent(out),		allocatable	::	val
logical(kind=LK),	intent(out),	optional		::	found

Description

Author: Jacob Williams
Date: 12/9/2013

Get a character string from a json file. The output val is an allocatable character string.

private subroutine json_file_get_integer_vec(me, path, vec, found)

Arguments

Type	Intent	Optional	Attributes		Name
class(json_file),	intent(inout)			::	me
character(kind=CK,len=*),	intent(in)			::	path	the path to the variable
integer(kind=IK),	intent(out),		dimension(:), allocatable	::	vec	the value vector
logical(kind=LK),	intent(out),	optional		::	found	if it was really found

Description

Author: Jacob Williams
Date: 1/20/2014

Get an integer vector from a JSON file.

private subroutine json_file_get_double_vec(me, path, vec, found)

Arguments

Type	Intent	Optional	Attributes		Name
class(json_file),	intent(inout)			::	me
character(kind=CK,len=*),	intent(in)			::	path
real(kind=RK),	intent(out),		dimension(:), allocatable	::	vec
logical(kind=LK),	intent(out),	optional		::	found

Description

Author: Jacob Williams
Date: 1/19/2014

Get a real(RK) vector from a JSON file.

private subroutine json_file_get_logical_vec(me, path, vec, found)

Arguments

Type	Intent	Optional	Attributes		Name
class(json_file),	intent(inout)			::	me
character(kind=CK,len=*),	intent(in)			::	path
logical(kind=LK),	intent(out),		dimension(:), allocatable	::	vec
logical(kind=LK),	intent(out),	optional		::	found

Description

Author: Jacob Williams
Date: 1/20/2014

Get a logical(LK) vector from a JSON file.

private subroutine json_file_get_string_vec(me, path, vec, found)

Arguments

Type	Intent	Optional	Attributes		Name
class(json_file),	intent(inout)			::	me
character(kind=CK,len=*),	intent(in)			::	path
character(kind=CK,len=*),	intent(out),		dimension(:), allocatable	::	vec
logical(kind=LK),	intent(out),	optional		::	found

Description

Author: Jacob Williams
Date: 1/19/2014

Get a string vector from a JSON file.

private subroutine json_file_get_root(me, p)

Arguments

Type	Intent	Optional	Attributes		Name
class(json_file),	intent(inout)			::	me
type(json_value),	intent(out),		pointer	::	p	pointer to the variable

Description

Author: Izaak Beekman
Date: 7/23/2015

Get a json_value pointer to the JSON file root.

generic, public :: update => json_file_update_integer, json_file_update_logical, json_file_update_real, json_file_update_string

private subroutine json_file_update_integer(me, name, val, found)

Arguments

Type	Intent		Name
class(json_file),	intent(inout)	::	me
character(kind=CK,len=*),	intent(in)	::	name
integer(kind=IK),	intent(in)	::	val
logical(kind=LK),	intent(out)	::	found

Description

Author: Jacob Williams
Date: 1/10/2015

Given the path string, if the variable is present in the file, and is a scalar, then update its value. If it is not present, then create it and set its value.

private subroutine json_file_update_logical(me, name, val, found)

Arguments

Type	Intent		Name
class(json_file),	intent(inout)	::	me
character(kind=CK,len=*),	intent(in)	::	name
logical(kind=LK),	intent(in)	::	val
logical(kind=LK),	intent(out)	::	found

Description

Author: Jacob Williams
Date: 1/10/2015

Given the path string, if the variable is present in the file, and is a scalar, then update its value. If it is not present, then create it and set its value.

private subroutine json_file_update_real(me, name, val, found)

Arguments

Type	Intent		Name
class(json_file),	intent(inout)	::	me
character(kind=CK,len=*),	intent(in)	::	name
real(kind=RK),	intent(in)	::	val
logical(kind=LK),	intent(out)	::	found

Description

Author: Jacob Williams
Date: 1/10/2015

Given the path string, if the variable is present in the file, and is a scalar, then update its value. If it is not present, then create it and set its value.

private subroutine json_file_update_string(me, name, val, found)

Arguments

Type	Intent		Name
class(json_file),	intent(inout)	::	me
character(kind=CK,len=*),	intent(in)	::	name
character(kind=CK,len=*),	intent(in)	::	val
logical(kind=LK),	intent(out)	::	found

Description

Author: Jacob Williams
Date: 1/10/2015

Given the path string, if the variable is present in the file, and is a scalar, then update its value. If it is not present, then create it and set its value.

procedure, public :: json_file_load_from_string

private subroutine json_file_load_from_string(me, str)

Arguments

Type	Intent	Optional	Attributes		Name
class(json_file),	intent(inout)			::	me
character(kind=CK,len=*),	intent(in)			::	str	string to load JSON data from

Description

Author: Jacob Williams
Date: 1/13/2015

Load the JSON data from a string.

procedure, public :: json_file_variable_info

private subroutine json_file_variable_info(me, path, found, var_type, n_children)

Arguments

Type	Intent		Name
class(json_file),	intent(inout)	::	me
character(kind=CK,len=*),	intent(in)	::	path	path to the variable
logical(kind=LK),	intent(out)	::	found	the variable exists in the structure
integer(kind=IK),	intent(out)	::	var_type	variable type
integer(kind=IK),	intent(out)	::	n_children	number of children

Description

Author: Jacob Williams
Date: 2/3/2014

Returns information about a variable in a json_file.

procedure, public :: json_file_get_object

private subroutine json_file_get_object(me, path, p, found)

Arguments

Type	Intent	Optional	Attributes		Name
class(json_file),	intent(inout)			::	me
character(kind=CK,len=*),	intent(in)			::	path	the path to the variable
type(json_value),	intent(out),		pointer	::	p	pointer to the variable
logical(kind=LK),	intent(out),	optional		::	found	if it was really found

Description

Author: Jacob Williams
Date: 2/3/2014

Get a json_value pointer to an object from a JSON file.

procedure, public :: json_file_get_integer

private subroutine json_file_get_integer(me, path, val, found)

Arguments

Type	Intent	Optional		Name
class(json_file),	intent(inout)		::	me
character(kind=CK,len=*),	intent(in)		::	path	the path to the variable
integer(kind=IK),	intent(out)		::	val	value
logical(kind=LK),	intent(out),	optional	::	found	if it was really found

Description

Author: Jacob Williams
Date: 12/9/2013

Get an integer value from a JSON file.

procedure, public :: json_file_get_double

private subroutine json_file_get_double(me, path, val, found)

Arguments

Type	Intent	Optional		Name
class(json_file),	intent(inout)		::	me
character(kind=CK,len=*),	intent(in)		::	path
real(kind=RK),	intent(out)		::	val
logical(kind=LK),	intent(out),	optional	::	found

Description

Author: Jacob Williams
Date: 12/9/2013

Get a real(RK) variable value from a JSON file.

procedure, public :: json_file_get_logical

private subroutine json_file_get_logical(me, path, val, found)

Arguments

Type	Intent	Optional		Name
class(json_file),	intent(inout)		::	me
character(kind=CK,len=*),	intent(in)		::	path
logical(kind=LK),	intent(out)		::	val
logical(kind=LK),	intent(out),	optional	::	found

Description

Author: Jacob Williams
Date: 12/9/2013

Get a logical(LK) value from a JSON file.

procedure, public :: json_file_get_string

private subroutine json_file_get_string(me, path, val, found)

Arguments

Type	Intent	Optional	Attributes		Name
class(json_file),	intent(inout)			::	me
character(kind=CK,len=*),	intent(in)			::	path
character(kind=CK,len=:),	intent(out),		allocatable	::	val
logical(kind=LK),	intent(out),	optional		::	found

Description

Author: Jacob Williams
Date: 12/9/2013

Get a character string from a json file. The output val is an allocatable character string.

procedure, public :: json_file_get_integer_vec

private subroutine json_file_get_integer_vec(me, path, vec, found)

Arguments

Type	Intent	Optional	Attributes		Name
class(json_file),	intent(inout)			::	me
character(kind=CK,len=*),	intent(in)			::	path	the path to the variable
integer(kind=IK),	intent(out),		dimension(:), allocatable	::	vec	the value vector
logical(kind=LK),	intent(out),	optional		::	found	if it was really found

Description

Author: Jacob Williams
Date: 1/20/2014

Get an integer vector from a JSON file.

procedure, public :: json_file_get_double_vec

private subroutine json_file_get_double_vec(me, path, vec, found)

Arguments

Type	Intent	Optional	Attributes		Name
class(json_file),	intent(inout)			::	me
character(kind=CK,len=*),	intent(in)			::	path
real(kind=RK),	intent(out),		dimension(:), allocatable	::	vec
logical(kind=LK),	intent(out),	optional		::	found

Description

Author: Jacob Williams
Date: 1/19/2014

Get a real(RK) vector from a JSON file.

procedure, public :: json_file_get_logical_vec

private subroutine json_file_get_logical_vec(me, path, vec, found)

Arguments

Type	Intent	Optional	Attributes		Name
class(json_file),	intent(inout)			::	me
character(kind=CK,len=*),	intent(in)			::	path
logical(kind=LK),	intent(out),		dimension(:), allocatable	::	vec
logical(kind=LK),	intent(out),	optional		::	found

Description

Author: Jacob Williams
Date: 1/20/2014

Get a logical(LK) vector from a JSON file.

procedure, public :: json_file_get_string_vec

private subroutine json_file_get_string_vec(me, path, vec, found)

Arguments

Type	Intent	Optional	Attributes		Name
class(json_file),	intent(inout)			::	me
character(kind=CK,len=*),	intent(in)			::	path
character(kind=CK,len=*),	intent(out),		dimension(:), allocatable	::	vec
logical(kind=LK),	intent(out),	optional		::	found

Description

Author: Jacob Williams
Date: 1/19/2014

Get a string vector from a JSON file.

procedure, public :: json_file_get_root

private subroutine json_file_get_root(me, p)

Arguments

Type	Intent	Optional	Attributes		Name
class(json_file),	intent(inout)			::	me
type(json_value),	intent(out),		pointer	::	p	pointer to the variable

Description

Author: Izaak Beekman
Date: 7/23/2015

Get a json_value pointer to the JSON file root.

procedure, public :: json_file_update_integer

private subroutine json_file_update_integer(me, name, val, found)

Arguments

Type	Intent		Name
class(json_file),	intent(inout)	::	me
character(kind=CK,len=*),	intent(in)	::	name
integer(kind=IK),	intent(in)	::	val
logical(kind=LK),	intent(out)	::	found

Description

Author: Jacob Williams
Date: 1/10/2015

Given the path string, if the variable is present in the file, and is a scalar, then update its value. If it is not present, then create it and set its value.

procedure, public :: json_file_update_logical

private subroutine json_file_update_logical(me, name, val, found)

Arguments

Type	Intent		Name
class(json_file),	intent(inout)	::	me
character(kind=CK,len=*),	intent(in)	::	name
logical(kind=LK),	intent(in)	::	val
logical(kind=LK),	intent(out)	::	found

Description

Author: Jacob Williams
Date: 1/10/2015

Given the path string, if the variable is present in the file, and is a scalar, then update its value. If it is not present, then create it and set its value.

procedure, public :: json_file_update_real

private subroutine json_file_update_real(me, name, val, found)

Arguments

Type	Intent		Name
class(json_file),	intent(inout)	::	me
character(kind=CK,len=*),	intent(in)	::	name
real(kind=RK),	intent(in)	::	val
logical(kind=LK),	intent(out)	::	found

Description

Author: Jacob Williams
Date: 1/10/2015

Given the path string, if the variable is present in the file, and is a scalar, then update its value. If it is not present, then create it and set its value.

procedure, public :: json_file_update_string

private subroutine json_file_update_string(me, name, val, found)

Arguments

Type	Intent		Name
class(json_file),	intent(inout)	::	me
character(kind=CK,len=*),	intent(in)	::	name
character(kind=CK,len=*),	intent(in)	::	val
logical(kind=LK),	intent(out)	::	found

Description

Author: Jacob Williams
Date: 1/10/2015

Given the path string, if the variable is present in the file, and is a scalar, then update its value. If it is not present, then create it and set its value.

procedure, public :: json_file_print_to_console

private subroutine json_file_print_to_console(me)

Arguments

Type Intent Optional Attributes Name

class(json_file), intent(inout) :: me

Description

Author
Jacob Williams

Date
1/11/2015

Print the JSON file to the console.

procedure, public :: json_file_print_1

private subroutine json_file_print_1(me, iunit)

Arguments

Type	Intent	Optional	Attributes		Name
class(json_file),	intent(inout)			::	me
integer(kind=IK),	intent(in)			::	iunit	file unit number (must not be -1)

Description

Author: Jacob Williams
Date: 12/9/2013

Prints the JSON file to the specified file unit number.

procedure, public :: json_file_print_2

private subroutine json_file_print_2(me, filename)

Arguments

Type	Intent	Optional	Attributes		Name
class(json_file),	intent(inout)			::	me
character(kind=CDK,len=*),	intent(in)			::	filename	filename to print to

Description

Author: Jacob Williams
Date: 1/11/2015

Print the JSON structure to the specified filename. The file is opened, printed, and then closed.

Source Code

    type,public :: json_file

        private

        type(json_value),pointer :: p => null()  !! the JSON structure read from the file

    contains

        procedure,public :: load_file => json_file_load

        generic,  public :: load_from_string => MAYBEWRAP(json_file_load_from_string)

        procedure,public :: destroy => json_file_destroy
        procedure,public :: move    => json_file_move_pointer
        generic,public   :: info    => MAYBEWRAP(json_file_variable_info)

        procedure,public :: print_to_string => json_file_print_to_string

        generic,public :: print_file => json_file_print_to_console, &
                                        json_file_print_1, &
                                        json_file_print_2

        generic,public :: get => MAYBEWRAP(json_file_get_object),      &
                                 MAYBEWRAP(json_file_get_integer),     &
                                 MAYBEWRAP(json_file_get_double),      &
                                 MAYBEWRAP(json_file_get_logical),     &
                                 MAYBEWRAP(json_file_get_string),      &
                                 MAYBEWRAP(json_file_get_integer_vec), &
                                 MAYBEWRAP(json_file_get_double_vec),  &
                                 MAYBEWRAP(json_file_get_logical_vec), &
                                 MAYBEWRAP(json_file_get_string_vec),  &
                                 json_file_get_root

        generic,public :: update =>  MAYBEWRAP(json_file_update_integer),  &
                                     MAYBEWRAP(json_file_update_logical),  &
                                     MAYBEWRAP(json_file_update_real),     &
                                     MAYBEWRAP(json_file_update_string)
#     ifdef USE_UCS4
        generic,public :: update => json_file_update_string_name_ascii, &
                                    json_file_update_string_val_ascii
#     endif

        !load from string:
        procedure :: MAYBEWRAP(json_file_load_from_string)

        !git info:
        procedure :: MAYBEWRAP(json_file_variable_info)

        !get:
        procedure :: MAYBEWRAP(json_file_get_object)
        procedure :: MAYBEWRAP(json_file_get_integer)
        procedure :: MAYBEWRAP(json_file_get_double)
        procedure :: MAYBEWRAP(json_file_get_logical)
        procedure :: MAYBEWRAP(json_file_get_string)
        procedure :: MAYBEWRAP(json_file_get_integer_vec)
        procedure :: MAYBEWRAP(json_file_get_double_vec)
        procedure :: MAYBEWRAP(json_file_get_logical_vec)
        procedure :: MAYBEWRAP(json_file_get_string_vec)
        procedure :: json_file_get_root

        !update:
        procedure :: MAYBEWRAP(json_file_update_integer)
        procedure :: MAYBEWRAP(json_file_update_logical)
        procedure :: MAYBEWRAP(json_file_update_real)
        procedure :: MAYBEWRAP(json_file_update_string)
#     ifdef USE_UCS4
        procedure :: json_file_update_string_name_ascii
        procedure :: json_file_update_string_val_ascii
#     endif

        !print_file:
        procedure :: json_file_print_to_console
        procedure :: json_file_print_1
        procedure :: json_file_print_2

    end type json_file

json_file Derived Type

Variables

Constructor

Type-Bound Procedures

Source Code

All Derived Types

type, public :: json_file

Example

Components

Constructor

private interface json_file

private function initialize_json_file(p) result(file_object)

Arguments

Return Value type(json_file)

Description

Type-Bound Procedures

procedure, public :: load_file => json_file_load

private subroutine json_file_load(me, filename, unit)

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generic, public :: load_from_string => json_file_load_from_string

private subroutine json_file_load_from_string(me, str)

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procedure, public :: destroy => json_file_destroy

private subroutine json_file_destroy(me)

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procedure, public :: move => json_file_move_pointer

private subroutine json_file_move_pointer(to, from)

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generic, public :: info => json_file_variable_info

private subroutine json_file_variable_info(me, path, found, var_type, n_children)

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procedure, public :: print_to_string => json_file_print_to_string

private subroutine json_file_print_to_string(me, str)

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generic, public :: print_file => json_file_print_to_console, json_file_print_1, json_file_print_2

private subroutine json_file_print_to_console(me)

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private subroutine json_file_print_1(me, iunit)

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private subroutine json_file_print_2(me, filename)

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generic, public :: get => json_file_get_object, json_file_get_integer, json_file_get_double, json_file_get_logical, json_file_get_string, json_file_get_integer_vec, json_file_get_double_vec, json_file_get_logical_vec, json_file_get_string_vec, json_file_get_root

private subroutine json_file_get_object(me, path, p, found)

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private subroutine json_file_get_integer(me, path, val, found)

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private subroutine json_file_get_double(me, path, val, found)

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private subroutine json_file_get_logical(me, path, val, found)

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private subroutine json_file_get_string(me, path, val, found)

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private subroutine json_file_get_integer_vec(me, path, vec, found)

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private subroutine json_file_get_double_vec(me, path, vec, found)

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private subroutine json_file_get_logical_vec(me, path, vec, found)

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private subroutine json_file_get_string_vec(me, path, vec, found)

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private subroutine json_file_get_root(me, p)

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