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generate.js
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generate.js
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const xml2object = require('xml2object');
const fs = require('fs');
const sourceFolder = './fhir-codegen-xsd/';
const destFolder = "./generated/";
const indent = " ";
var typesCache = {};
// Create or clean the destination folder
if (!fs.existsSync(destFolder))
fs.mkdirSync(destFolder);
// Processing functions
var processXsd = function(filename)
{
var parser = new xml2object(["xs:schema"], sourceFolder + filename);
parser.on("object", function(name, schema)
{
console.log("Pre-processing " + filename + "...");
var destFile = destFolder + filename.replace(".xsd", ".cs");
var types = getTypes(schema);
var text =
"using System;\r\n" +
"using System.Collections.Generic;\r\n\r\n" +
"namespace Efferent.FHIR.Entities\r\n" +
"{\r\n" +
parseTypes(types, null, "") + "\r\n" +
"}";
fs.writeFile(destFile, text);
console.log("Finished pre-processing.");
});
parser.start();
}
// Get all the types of a schema object
var getTypes = function(schema)
{
var simple = getNodes(schema, "xs:simpleType");
var complex = getNodes(schema, "xs:complexType");
var associative = {};
simple.forEach(function(element) {
element["kind"] = "simple";
associative[element["name"]] = element;
});
complex.forEach(function(element) {
element["kind"] = "complex";
associative[element["name"]] = element;
});
return associative;
}
// Parses a complex type
var parseComplexType = function(schemaTypes, typeDef, margin, alias)
{
var text = "";
var complex = typeDef["xs:complexContent"] || {};
var base, sequence, attribute;
var name = typeDef["name"];
if (complex.hasOwnProperty("xs:restriction"))
{
var restriction = complex["xs:restriction"];
base = restriction["base"] || null;
sequence = restriction["xs:sequence"] || {};
attribute = restriction["xs:attribute"] || {};
}
else if (complex.hasOwnProperty("xs:extension"))
{
var extension = complex["xs:extension"];
base = extension["base"] || null;
sequence = extension["xs:sequence"] || {};
attribute = extension["xs:attribute"] || {};
}
else if (typeDef.hasOwnProperty("xs:sequence"))
{
base = null;
sequence = typeDef["xs:sequence"] || {};
attribute = typeDef["xs:attribute"] || {};
}
else
return "";
if (Object.keys(sequence).length == 0) // not a real class, may be an enumeration
{
if (attribute.hasOwnProperty("type"))
{
var singleType = {};
singleType[attribute["type"]] = schemaTypes[attribute["type"]];
var typeContent = parseTypes(singleType, attribute["type"], margin, normalizeIdentifier(name));
if (typeContent.length > 0)
{
text = buildSummary(typeDef, margin);
text += typeContent;
}
}
}
else // it is a class
{
var isComponent = name.indexOf('.') > -1;
text = "";
if (isComponent)
{
text = margin + "public partial class " + identifierBase(name) + "\r\n" +
margin + "{\r\n";
margin += indent;
}
var className = normalizeIdentifier(name);
var classCache = (base == null || !typesCache[base]) ? {} : JSON.parse(JSON.stringify(typesCache[base]));
text += buildSummary(typeDef, margin);
text += margin + "public " + (isComponent ? "" : "partial ") + "class " + className + (base==null ? "" : " : " + base) + "\r\n" +
margin + "{\r\n";
var elements = getNodes(sequence, "xs:element");
elements.forEach(function(element) {
if (!element["type"])
return;
var originalTypeName = element["type"].replace('-', '_');
var propertyType = parsePropertyType(element);
var propName = toTitleCase(element["name"]);
classCache[propName] = propertyType;
if (base != null && typesCache.hasOwnProperty(base))
{
if (typesCache[base].hasOwnProperty(propName)) // avoid property override
return;
}
text += buildSummary(element, margin + indent);
if (isList(element))
text += margin + indent + "public List<" + propertyType + "> " + propName + " { get; set; }\r\n";
else
text += margin + indent + "public " + propertyType + " " + propName + " { get; set; }\r\n";
text += "\r\n";
});
text += margin + "}\r\n";
if (isComponent)
{
margin = margin.substring(0, margin.length - indent.length);
text += margin + "}\r\n";
}
else
{
typesCache[className] = classCache;
}
}
return text;
}
var enumValueMapping = {
"=": "Equal",
">": "GreaterThan",
">=": "GreaterOrEqual",
"<": "LessThan",
"<=": "LessOrEqual"
}
var parseEnumeration = function(schemaTypes, typeDef, margin, alias)
{
var text = "";
var restriction = typeDef["xs:restriction"];
var enumValues = getNodes(restriction, "xs:enumeration");
if (enumValues.length > 0)
{
text += buildSummary(typeDef, margin);
text += margin + "public enum " + (alias || name) + "\r\n";
text += margin + "{\r\n";
var values = []
enumValues.forEach(function(enumValue)
{
var text1 = buildSummary(enumValue, margin + indent);
var value = enumValue["value"];
if (enumValueMapping.hasOwnProperty(value))
value = enumValueMapping[value];
else if (/\d/.test(value))
value = 'N' + value;
else
value = toTitleCase(value);
text1 += margin + indent + value;
values.push(text1);
});
text += values.join(",\r\n") + "\r\n";
text += margin + "}\r\n";
}
return text;
}
// Parses all the types in a collection
var parseTypes = function(allTypes, mainType, margin, alias)
{
var text = "";
var embed = "";
for (name in allTypes)
{
var isMainType = name == mainType;
var typeDef = allTypes[name];
if (typeDef["kind"] == "complex") // It's a class (maybe)
{
if (isMainType)
text += parseComplexType(allTypes, typeDef, margin, alias || name);
else
embed += parseComplexType(allTypes, typeDef, margin + indent, alias).replace("// <nested>", "");
}
else if (typeDef.hasOwnProperty("xs:restriction") && alias !== undefined) // It's an enumeration wrapped by a complex type
{
text += parseEnumeration(allTypes, typeDef, margin, alias);
}
}
if (embed.length > 0)
{
if (mainType == null)
text = embed;
else
text = text.replace("// <nested>", embed);
}
return text;
}
var typeMapping = {
"string": "string",
"oid": "string",
"id": "string",
"uuid": "string",
"markdown": "string",
"uri": "string",
"code": "string",
"date": "?DateTime",
"dateTime": "?DateTime",
"time": "?TimeSpan",
"instant": "?DateTimeOffset",
"positiveInt": "?int",
"unsignedInt": "?int",
"integer": "?int",
"decimal": "?double",
"base64Binary": "byte[]",
"boolean": "?bool",
"SampledDataDataType": "string"
}
// Evaluates a property definition and determines if it is a primitive type
var parsePropertyType = function(element)
{
var type = normalizeIdentifier(element["type"]);
if (typeMapping.hasOwnProperty(type))
{
var native = typeMapping[type];
if (native.charAt(0) == '?')
{
native = native.substring(1);
if (isNullable(element))
native += "?";
}
return native;
}
return type;
}
var normalizeIdentifier = function(name)
{
var type = name.replace('-', '_');
if (type.indexOf('.') > -1)
type = type.substring(type.lastIndexOf('.')+1) + "Component";
if (type == "Reference") // special case
type = "ResourceReference"
return type;
}
var identifierBase = function(name)
{
var type = name.replace('-', '_');
type = type.substring(0, type.indexOf('.'));
return type;
}
var isNullable = function(element)
{
var minOccurs = element["minOccurs"] || "1";
return minOccurs == "0";
}
var isList = function(element)
{
var minOccurs = element["minOccurs"] || "1";
var maxOccurs = element["maxOccurs"] || "1";
if (parseInt(minOccurs > 1))
return true;
if (maxOccurs == "unbounded")
return true;
if (parseInt(maxOccurs > 1))
return true;
return false;
}
var toTitleCase = function(text)
{
return text.split('-').map(i => i[0].toUpperCase() + i.substring(1)).join('')
}
// Gets a list of one or more XML nodes with the same tag
var getNodes = function(schema, nodeTag, subNode)
{
var list = [];
if (schema.hasOwnProperty(nodeTag))
{
var nodes = schema[nodeTag];
if (subNode)
{
if (Array.isArray(nodes))
nodes.forEach(function(element) {list.push(element[subNode]);}); // array of nodes
else
list.push(nodes[subNode]); // single node
}
else
{
if (Array.isArray(nodes))
nodes.forEach(function(element) {list.push(element);}); // array of nodes
else
list.push(nodes); // single node
}
}
return list;
}
// Get a list of documentation lines, and split properly
var getDocumentation = function(element)
{
if (!element.hasOwnProperty("xs:annotation"))
return [];
var annotation = element["xs:annotation"];
var nodes = getNodes(annotation, "xs:documentation", "$t");
var lines = [];
nodes.forEach(function(element)
{
if (element !== undefined)
{
element.match(/[^\r\n]+/g).forEach(function(line) {
lines.push(line);
})
}
});
return lines;
}
// Build a summary section for a type or member
var buildSummary = function(element, margin)
{
var doc = getDocumentation(element);
if (doc.length == 0)
return "";
var hasSummary = false;
var summary = margin + "/// <summary>\r\n";
doc.forEach(function(element) {
summary += margin + "/// " + element + "\r\n";
hasSummary = true;
});
summary += margin + "/// </summary>\r\n";
return summary;
}
// Process all FHIR entities
processXsd("fhir-single.xsd");