51 lines
1.6 KiB
Matlab
51 lines
1.6 KiB
Matlab
function ast = handle_constant_eqs(ast)
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%function ast = handle_constant_eqs(ast)
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%
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% Code to handle equations of type `X = 0;` in AST. Returns equation(s)
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% removed from AST.
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%
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% INPUTS
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% ast [cell array] JSON representation of abstract syntax tree
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%
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% OUTPUTS
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% ast [cell array] updated JSON representation of abstract syntax tree
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%
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% SPECIAL REQUIREMENTS
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% none
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% Copyright © 2019 Dynare Team
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%
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% This file is part of Dynare.
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%
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% Dynare is free software: you can redistribute it and/or modify
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% it under the terms of the GNU General Public License as published by
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% the Free Software Foundation, either version 3 of the License, or
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% (at your option) any later version.
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%
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% Dynare is distributed in the hope that it will be useful,
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% but WITHOUT ANY WARRANTY; without even the implied warranty of
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% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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% GNU General Public License for more details.
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%
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% You should have received a copy of the GNU General Public License
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% along with Dynare. If not, see <https://www.gnu.org/licenses/>.
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if nargin ~= 1
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error('Incorrect number of arguments to function')
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end
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if isempty(ast) || ~iscell(ast)
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error('ast must be a cell')
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end
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for i = length(ast):-1:1
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assert(strcmp(ast{i}.AST.node_type, 'BinaryOpNode') && strcmp(ast{i}.AST.op, '='), 'Expecting equation');
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if strcmp(ast{i}.AST.arg2.node_type, 'NumConstNode')
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if ~strcmp(ast{i}.AST.arg1.node_type, 'VariableNode')
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error('At the moment only handling Variable Nodes on LHS')
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end
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ast = ast([1:i-1, i+1:end]);
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end
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end
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end
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