transitioning away from custom coded rules to full BIDS schema

Author: bendhouseart

matlab/get_bids_schema.m

@@ -0,0 +1,74 @@
+function schema = get_bids_schema(schema_version)
+%GET_BIDS_SCHEMA Get BIDS schema with online fallback
+%   SCHEMA = GET_BIDS_SCHEMA() gets the latest BIDS schema
+%   SCHEMA = GET_BIDS_SCHEMA(VERSION) gets a specific version
+%
+%   This function tries to use the packaged schema first, then falls
+%   back to downloading from online if the local version is not available.
+
+    if nargin < 1
+        schema_version = 'latest';
+    end
+    
+    % Try to get from Python package first
+    try
+        % Get the path to the Python package
+        python_package_path = get_python_package_path();
+        schema_path = fullfile(python_package_path, 'bids_schema.json');
+        
+        if exist(schema_path, 'file')
+            schema = read_json_file(schema_path);
+            return;
+        end
+    catch
+        % Continue to online fallback
+    end
+    
+    % Try online download
+    try
+        url = sprintf('https://bids-specification.readthedocs.io/en/%s/schema.json', schema_version);
+        schema = webread(url);
+        return;
+    catch
+        error('BIDS schema not available online or offline');
+    end
+end
+
+function package_path = get_python_package_path()
+%GET_PYTHON_PACKAGE_PATH Get path to the pypet2bids package
+    
+    % Try to find the package in common locations
+    possible_paths = {
+        fullfile(pwd, 'pypet2bids', 'pypet2bids'),  % Local development
+        fullfile(fileparts(mfilename('fullpath')), '..', 'pypet2bids', 'pypet2bids'),  % Relative to this file
+        fullfile(userpath, 'pypet2bids'),  % User path
+    };
+    
+    for i = 1:length(possible_paths)
+        if exist(possible_paths{i}, 'dir')
+            package_path = possible_paths{i};
+            return;
+        end
+    end
+    
+    error('Could not find pypet2bids package');
+end
+
+function data = read_json_file(filepath)
+%READ_JSON_FILE Read and parse JSON file
+    
+    fid = fopen(filepath, 'r');
+    if fid == -1
+        error('Could not open file: %s', filepath);
+    end
+    
+    try
+        content = fread(fid, inf, 'char=>char')';
+        data = jsondecode(content);
+    catch ME
+        fclose(fid);
+        rethrow(ME);
+    end
+    
+    fclose(fid);
+end