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215 | -- --
-- package Copyright (c) Dmitry A. Kazakov --
-- Parsers.JSON Luebeck --
-- Implementation Autumn, 2019 --
-- --
-- Last revision : 19:57 14 Sep 2019 --
-- --
-- This library is free software; you can redistribute it and/or --
-- modify it under the terms of the GNU General Public License as --
-- published by the Free Software Foundation; either version 2 of --
-- the License, or (at your option) any later version. This library --
-- is distributed in the hope that it will be useful, but WITHOUT --
-- ANY WARRANTY; without even the implied warranty of --
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU --
-- General Public License for more details. You should have --
-- received a copy of the GNU General Public License along with --
-- this library; if not, write to the Free Software Foundation, --
-- Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. --
-- --
-- As a special exception, if other files instantiate generics from --
-- this unit, or you link this unit with other files to produce an --
-- executable, this unit does not by itself cause the resulting --
-- executable to be covered by the GNU General Public License. This --
-- exception does not however invalidate any other reasons why the --
-- executable file might be covered by the GNU Public License. --
--____________________________________________________________________--
with Ada.Strings.Maps; use Ada.Strings.Maps;
with Strings_Edit; use Strings_Edit;
package Parsers.JSON is
--
-- JSON_Value_Type -- The JSON value type
--
type JSON_Value_Type is
( JSON_Boolean, -- True / False
JSON_Null, -- Null
JSON_Number, -- Numeric value
JSON_String, -- Text
JSON_Array, -- Array of any values, a sequence
JSON_Object -- Name to value mapping
);
--
-- JSON_Value -- The JSON value
--
type JSON_String_Ptr is access constant String;
type JSON_Value;
type JSON_Value_Ptr is access constant JSON_Value;
type JSON_Sequence;
type JSON_Sequence_Ptr is access constant JSON_Sequence;
type JSON_Pair_Array;
type JSON_Pair_Array_Ptr is access constant JSON_Pair_Array;
type JSON_Value
( JSON_Type : JSON_Value_Type := JSON_Boolean
) is
record
case JSON_Type is
when JSON_Boolean =>
Condition : Boolean := False;
when JSON_Null =>
null;
when JSON_Number =>
Value : Long_Float := 0.0;
when JSON_String =>
Text : JSON_String_Ptr;
when JSON_Array =>
Sequence : JSON_Sequence_Ptr;
when JSON_Object =>
Map : JSON_Pair_Array_Ptr;
end case;
end record;
type JSON_Sequence is array (Positive range <>) of JSON_Value;
type JSON_Pair is record
Name : JSON_String_Ptr;
Value : JSON_Value;
end record;
type JSON_Pair_Array is array (Positive range <>) of JSON_Pair;
--
-- Put -- Put a value in JSON format
--
-- Destination - The string that accepts the output
-- Pointer - The current position in the string
-- Value - The value to be put
-- Escape - Escape any non-printable or non-ASCII characters
-- Field - The output field
-- Justify - Alignment within the field
-- Fill - The fill character
--
-- Exceptions:
--
-- Data_Error - Invalid UTF-8 encoding of a string or tag
-- Layout_Error - Pointer is not in Destination'Range or there is no
-- room for the output.
--
procedure Put
( Destination : in out String;
Pointer : in out Integer;
Value : JSON_Sequence;
Escape : Boolean := False;
Field : Natural := 0;
Justify : Alignment := Left;
Fill : Character := ' '
);
procedure Put
( Destination : in out String;
Pointer : in out Integer;
Value : JSON_Pair_Array;
Escape : Boolean := False;
Field : Natural := 0;
Justify : Alignment := Left;
Fill : Character := ' '
);
procedure Put
( Destination : in out String;
Pointer : in out Integer;
Value : JSON_Value;
Escape : Boolean := False;
Field : Natural := 0;
Justify : Alignment := Left;
Fill : Character := ' '
);
procedure Put
( Destination : in out String;
Pointer : in out Integer;
Value : String;
Escape : Boolean := False;
Field : Natural := 0;
Justify : Alignment := Left;
Fill : Character := ' '
);
--
-- Image -- String in JSON format
--
-- Value - The value to be converted
-- Escape - Escape any non-printable or non-ASCII characters
--
-- Returns :
--
-- The result string
--
-- Exceptions:
--
-- Data_Error - Invalid UTF-8 encoding of a string or tag
--
function Image
( Value : JSON_Sequence;
Escape : Boolean := False
) return String;
function Image
( Value : JSON_Pair_Array;
Escape : Boolean := False
) return String;
function Image
( Value : JSON_Value;
Escape : Boolean := False
) return String;
function Image
( Value : String;
Escape : Boolean := False
) return String;
private
WS : constant Character_Set :=
To_Set
( ' '
& Character'Val (9)
& Character'Val (10)
& Character'Val (13)
);
--
-- Check_Spelling -- Of a name, no checks
--
procedure Check_Spelling (Name : String);
--
-- Check_Matched -- Check if no broken keyword matched
--
function Check_Matched (Source : String; Pointer : Integer)
return Boolean;
--
-- Operations -- All the operations supported
--
type Operations is
( Comma, Colon, -- Commas , and :
Left_Brace, Right_Brace, -- Braces {}
Left_Bracket, Right_Bracket -- Brackets []
);
--
-- "and" -- Checks operation associations, always True (Ok)
--
function "and" (Left, Right : Operations) return Boolean;
--
-- Is_Commutative -- No commutative operations, always False
--
function Is_Commutative (Left, Right : Operations) return Boolean;
--
-- Is_Inverse -- No commutative operations, always False
--
function Is_Inverse (Operation : Operations) return Boolean;
--
-- Group_Inverse -- No commutative operations, never called
--
function Group_Inverse (Operation : Operations) return Operations;
--
-- Priorities -- The levels of association
--
type Priorities is mod 2;
--
-- Tokens -- The lexical tokens
--
type JSON_Argument is record
Name : JSON_String_Ptr;
Value : JSON_Value;
end record;
end Parsers.JSON;
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