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[feat] support flags for using jsonlab or jsonencode/jsondecode
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@fangq
fangq committed Sep 29, 2024
1 parent 5b5bc49 commit 7cd46ea
Showing 1 changed file with 64 additions and 16 deletions.
80 changes: 64 additions & 16 deletions jdict.m
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Original file line number Diff line number Diff line change
Expand Up @@ -87,13 +87,21 @@
properties
data
end
properties (Access = private)
flags
end
methods

function obj = jdict(val)
if (nargin == 1)
if (ischar(val) && ~isempty(regexp(val, '^https*://', 'once')))
function obj = jdict(val, varargin)
obj.flags = struct('builtinjson', 0);
if (nargin >= 1)
if (~isempty(varargin))
allflags = [varargin(1:2:end); varargin(2:2:end)];
obj.flags = struct(allflags{:});
end
if (ischar(val) && ~isempty(regexpi(val, '^https*://', 'once')))
try
obj.data = loadjson(val);
obj.data = obj.call_('loadjson', val);
catch
obj.data = val;
end
Expand All @@ -107,8 +115,9 @@
end
end

% overloading the getter function
function val = subsref(obj, idxkey)
% overloading the getter function jd.('key').('subkey')

oplen = length(idxkey);
val = obj.data;
if (oplen == 1 && strcmp(idxkey.type, '()') && isempty(idxkey.subs))
Expand All @@ -117,7 +126,6 @@
i = 1;
while i <= oplen
idx = idxkey(i);
% disp({i, savejson(idx)});
if (isempty(idx.subs))
i = i + 1;
continue
Expand All @@ -142,7 +150,7 @@
end
elseif (strcmp(idx.type, '.') && ischar(idx.subs) && strcmp(idx.subs, 'v') && oplen == 1)
i = i + 1;
continue;
continue
elseif ((idx.type == '.' && ischar(idx.subs)) || (iscell(idx.subs) && ~isempty(idx.subs{1})))
onekey = idx.subs;
if (iscell(onekey))
Expand All @@ -152,7 +160,7 @@
val = val.data;
end
if (ischar(onekey) && ~isempty(onekey) && onekey(1) == '$')
val = jsonpath(val, onekey);
val = obj.call_('jsonpath', val, onekey);
elseif (isstruct(val))
val = val.(onekey);
elseif (isa(val, 'containers.Map') || isa(val, 'dictionary'))
Expand All @@ -170,13 +178,13 @@
end
end

% overloading the setter function, obj.('idxkey')=otherobj
% expanded from rahnema1's sample at https://stackoverflow.com/a/79030223/4271392
function obj = subsasgn(obj, idxkey, otherobj)
% overloading the setter function, obj.('key').('subkey')=otherobj
% expanded from rahnema1's sample at https://stackoverflow.com/a/79030223/4271392
oplen = length(idxkey);
opcell = cell (1, oplen + 1);
if (isempty(obj.data))
obj.data = containers.Map();
obj.data = obj.newkey_();
end
opcell{1} = obj.data;

Expand All @@ -196,13 +204,13 @@
if (ischar(idx.subs))
if (((isa(opcell{i}, 'containers.Map') || isa(opcell{i}, 'dictionary')) && ~isKey(opcell{i}, idx.subs)))
idx.type = '()';
opcell{i}(idx.subs) = containers.Map();
opcell{i}(idx.subs) = obj.newkey_();
elseif (isstruct(opcell{i}) && ~isfield(opcell{i}, idx.subs))
opcell{i}.(idx.subs) = containers.Map();
opcell{i}.(idx.subs) = obj.newkey_();
end
end
end
if (exist('OCTAVE_VERSION', 'builtin') ~= 0) && (isa(opcell{i}, 'containers.Map') || isa(opcell{i}, 'dictionary'))
if (isa(opcell{i}, 'containers.Map') || isa(opcell{i}, 'dictionary'))
opcell{i + 1} = opcell{i}(idx.subs);
else
opcell{i + 1} = subsref(opcell{i}, idx);
Expand All @@ -218,6 +226,10 @@

for i = oplen - 1:-1:1
idx = idxkey(i);
if (ischar(idx.subs) && strcmp(idx.type, '.') && (isa(opcell{i}, 'containers.Map') || isa(opcell{i}, 'dictionary')))
idx.type = '()';
end

if (ischar(idx.subs) && strcmp(idx.subs, 'v'))
opcell{i} = opcell{i + 1};
continue
Expand All @@ -239,14 +251,17 @@
end

function val = tojson(obj, varargin)
val = savejson('', obj.data, 'compact', 1, varargin{:});
% printing underlying data to compact-formed JSON string
val = obj.call_('jsonpath', '', obj.data, 'compact', 1, varargin{:});
end

function obj = fromjson(obj, fname, varargin)
obj.data = loadjd(fname, varargin{:});
% loading diverse data files using loadjd interface in jsonlab
obj.data = obj.call_('loadjd', fname, varargin{:});
end

function val = keys(obj)
% list subfields at the current level
if (isstruct(obj.data))
val = fieldnames(obj.data);
elseif (isa(obj.data, 'containers.Map') || isa(obj.data, 'dictionary'))
Expand All @@ -257,6 +272,7 @@
end

function val = len(obj)
% return the number of subfields at the current level
val = length(obj.data);
end

Expand All @@ -268,5 +284,37 @@
end
end

function val = newkey_(obj)
% insert new key if does not exist
if (exist('containers.Map'))
val = containers.Map;
else
val = struct;
end
end

function varargout = call_(obj, func, varargin)
% interface to external functions and dependencies
if (~obj.flags.builtinjson)
if (~exist('loadjson', 'file'))
error('you must first install jsonlab (https://github.com/NeuroJSON/jsonlab) or set "BuildinJSON" flag to 1');
end
fhandle = str2func(func);
[varargout{1:nargout}] = fhandle(varargin{:});
else
if (~exist('jsonencode', 'builtin') && ~strcmp(func, 'jsonpath'))
error('jsonencode/jsondecode are not available, please install jsonlab (https://github.com/NeuroJSON/jsonlab) and set "BuiltinJSON" flag to 0');
end
switch func
case 'loadjson'
[varargout{1:nargout}] = jsondecode(webread(varargin{:}));
case 'savejson'
[varargout{1:nargout}] = jsonencode(varargin{:});
case 'jsonpath'
error('please install jsonlab (https://github.com/NeuroJSON/jsonlab) and set "BuiltinJSON" flag to 0');
end
end
end

end
end

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