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function [lhs, rhs, json] = get_lhs_and_rhs(eqname, M_, original, json)
% [lhs, rhs, json] = get_lhs_and_rhs(eqname, M_, original, json)
% Returns the left and right handsides of an equation.
%
% INPUTS
% - eqname [char] Name of the equation.
% - M_ [struct] Structure describing the current model.
% - original [logical] fetch equation in modfile-original.json or modfile.json
% - json [char] content of the JSON file
%
% OUTPUTS
% - lhs [char] Left hand side of the equation.
% - rhs [char] Right hand side of the equation.
%
%
% SPECIAL REQUIREMENTS
% The user must have attached names to the equations using equation
% tags. Each equation in the model block must be preceeded with a
% tag (see the reference manual). For instance, we should have
% something as:
%
% [name='Phillips curve']
% pi = beta*pi(1) + slope*y + lam;
% Copyright © 2018-2023 Dynare Team
%
% This file is part of Dynare.
%
% Dynare 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 3 of the License, or
% (at your option) any later version.
%
% Dynare 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 Dynare. If not, see <https://www.gnu.org/licenses/>.
if nargin<3 || isempty(original)
original = false;
end
% Load JSON file if nargin<4
if nargin<4
if original
json = loadjson_([M_.fname filesep() 'model' filesep() 'json' filesep() 'modfile-original.json']);
else
json = loadjson_([M_.fname filesep() 'model' filesep() 'json' filesep() 'modfile.json']);
end
end
% Load model.
jsonmod = json.model;
if isstruct(jsonmod)
jsonmod = {jsonmod};
end
% Load equation.
jsoneqn = getEquationsByTags(jsonmod, 'name', eqname);
% Get the lhs and rhs members of the selected equation.
lhs = jsoneqn{1}.lhs;
rhs = jsoneqn{1}.rhs;
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