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R8218/CT/private/parseParameterValuePairs.m
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parseParameterValuePairs.m
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function options = parseParameterValuePairs(funcName, knownParams, varargin)
%parseParameterValuePairs Get user-provided and default options.
% OPTIONS = parseParameterValuePairs(FUNCNAME, DETAILS, PARAM1, VALUE1, ...)
% parses and validates a set of parameter-value pairs. FUNCNAME is a
% character array containing the name of the function that accepts
% various parameters (PARAM1, etc.) and values (VALUE1, etc.). DETAILS
% is a cell array with one row per known parameter and has the following
% columns:
%
% 1 - Parameter name (character array)
% 2 - Output field name (character array)
% 3 - Default parameter value (any value)
% 4 - Acceptable value type (cell array of MATLAB types)
% 5 - Value parameters (cell array of validateattributes values)
%
% The output value OPTIONS is a structure array whose field names are
% the parameters and whose values are the corresponding values. The
% field names of OPTIONS may not actually match the parameter names
% expected by FUNCNAME, depending on the values in the second column of
% DETAILS. This allows convenient field names for internal use.
%
% Copyright 2007-2010 The MathWorks, Inc.
% Create a structure with default values, and map actual param-value pair
% names to convenient names for internal use.
options = cell2struct(knownParams(:,3), knownParams(:,2), 1);
if (rem(nargin, 2) ~= 0)
error(message('images:parseParameterValuePairs:paramValuePairs'))
end
% Loop over the P-V pairs.
for p = 1:2:numel(varargin)
% Get the parameter name.
paramName = varargin{p};
if (~ischar(paramName))
error(message('images:parseParameterValuePairs:badParamName'))
end
% Look for the parameter amongst the possible values.
idx = strmatch(lower(paramName), lower(knownParams(:,1)));
if (isempty(idx))
error(message('images:parseParameterValuePairs:unknownParamName', paramName));
elseif (numel(idx) > 1)
error(message('images:parseParameterValuePairs:ambiguousParamName', paramName));
end
% Validate the value.
options.(knownParams{idx, 2}) = varargin{p+1};
validateattributes(varargin{p+1}, ...
knownParams{idx,4}, ...
knownParams{idx,5}, ...
funcName, ...
knownParams{idx,1}, ...
p+2); % p+2 = Param name + 1 + offset to first arg
end
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