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read.js
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import {
forEach,
find,
assign
} from 'min-dash';
import {
Parser as SaxParser
} from 'saxen';
import {
Moddle,
parseNameNS,
coerceType,
isSimpleType
} from 'moddle';
import {
DEFAULT_NS_MAP,
getSerializationType,
hasLowerCaseAlias
} from './common.js';
function capitalize(str) {
return str.charAt(0).toUpperCase() + str.slice(1);
}
function aliasToName(aliasNs, pkg) {
if (!hasLowerCaseAlias(pkg)) {
return aliasNs.name;
}
return aliasNs.prefix + ':' + capitalize(aliasNs.localName);
}
/**
* Un-prefix a potentially prefixed type name.
*
* @param {NsName} nameNs
* @param {Object} [pkg]
*
* @return {string}
*/
function prefixedToName(nameNs, pkg) {
var name = nameNs.name,
localName = nameNs.localName;
var typePrefix = pkg && pkg.xml && pkg.xml.typePrefix;
if (typePrefix && localName.indexOf(typePrefix) === 0) {
return nameNs.prefix + ':' + localName.slice(typePrefix.length);
} else {
return name;
}
}
function normalizeTypeName(name, nsMap, model) {
// normalize against actual NS
const nameNs = parseNameNS(name, nsMap.xmlns);
const normalizedName = `${ nsMap[nameNs.prefix] || nameNs.prefix }:${ nameNs.localName }`;
const normalizedNameNs = parseNameNS(normalizedName);
// determine actual type name, based on package-defined prefix
var pkg = model.getPackage(normalizedNameNs.prefix);
return prefixedToName(normalizedNameNs, pkg);
}
function error(message) {
return new Error(message);
}
/**
* Get the moddle descriptor for a given instance or type.
*
* @param {ModdleElement|Function} element
*
* @return {Object} the moddle descriptor
*/
function getModdleDescriptor(element) {
return element.$descriptor;
}
/**
* A parse context.
*
* @class
*
* @param {Object} options
* @param {ElementHandler} options.rootHandler the root handler for parsing a document
* @param {boolean} [options.lax=false] whether or not to ignore invalid elements
*/
export function Context(options) {
/**
* @property {ElementHandler} rootHandler
*/
/**
* @property {Boolean} lax
*/
assign(this, options);
this.elementsById = {};
this.references = [];
this.warnings = [];
/**
* Add an unresolved reference.
*
* @param {Object} reference
*/
this.addReference = function(reference) {
this.references.push(reference);
};
/**
* Add a processed element.
*
* @param {ModdleElement} element
*/
this.addElement = function(element) {
if (!element) {
throw error('expected element');
}
var elementsById = this.elementsById;
var descriptor = getModdleDescriptor(element);
var idProperty = descriptor.idProperty,
id;
if (idProperty) {
id = element.get(idProperty.name);
if (id) {
// for QName validation as per http://www.w3.org/TR/REC-xml/#NT-NameChar
if (!/^([a-z][\w-.]*:)?[a-z_][\w-.]*$/i.test(id)) {
throw new Error('illegal ID <' + id + '>');
}
if (elementsById[id]) {
throw error('duplicate ID <' + id + '>');
}
elementsById[id] = element;
}
}
};
/**
* Add an import warning.
*
* @param {Object} warning
* @param {String} warning.message
* @param {Error} [warning.error]
*/
this.addWarning = function(warning) {
this.warnings.push(warning);
};
}
function BaseHandler() {}
BaseHandler.prototype.handleEnd = function() {};
BaseHandler.prototype.handleText = function() {};
BaseHandler.prototype.handleNode = function() {};
/**
* A simple pass through handler that does nothing except for
* ignoring all input it receives.
*
* This is used to ignore unknown elements and
* attributes.
*/
function NoopHandler() { }
NoopHandler.prototype = Object.create(BaseHandler.prototype);
NoopHandler.prototype.handleNode = function() {
return this;
};
function BodyHandler() {}
BodyHandler.prototype = Object.create(BaseHandler.prototype);
BodyHandler.prototype.handleText = function(text) {
this.body = (this.body || '') + text;
};
function ReferenceHandler(property, context) {
this.property = property;
this.context = context;
}
ReferenceHandler.prototype = Object.create(BodyHandler.prototype);
ReferenceHandler.prototype.handleNode = function(node) {
if (this.element) {
throw error('expected no sub nodes');
} else {
this.element = this.createReference(node);
}
return this;
};
ReferenceHandler.prototype.handleEnd = function() {
this.element.id = this.body;
};
ReferenceHandler.prototype.createReference = function(node) {
return {
property: this.property.ns.name,
id: ''
};
};
function ValueHandler(propertyDesc, element) {
this.element = element;
this.propertyDesc = propertyDesc;
}
ValueHandler.prototype = Object.create(BodyHandler.prototype);
ValueHandler.prototype.handleEnd = function() {
var value = this.body || '',
element = this.element,
propertyDesc = this.propertyDesc;
value = coerceType(propertyDesc.type, value);
if (propertyDesc.isMany) {
element.get(propertyDesc.name).push(value);
} else {
element.set(propertyDesc.name, value);
}
};
function BaseElementHandler() {}
BaseElementHandler.prototype = Object.create(BodyHandler.prototype);
BaseElementHandler.prototype.handleNode = function(node) {
var parser = this,
element = this.element;
if (!element) {
element = this.element = this.createElement(node);
this.context.addElement(element);
} else {
parser = this.handleChild(node);
}
return parser;
};
/**
* @class Reader.ElementHandler
*
*/
export function ElementHandler(model, typeName, context) {
this.model = model;
this.type = model.getType(typeName);
this.context = context;
}
ElementHandler.prototype = Object.create(BaseElementHandler.prototype);
ElementHandler.prototype.addReference = function(reference) {
this.context.addReference(reference);
};
ElementHandler.prototype.handleText = function(text) {
var element = this.element,
descriptor = getModdleDescriptor(element),
bodyProperty = descriptor.bodyProperty;
if (!bodyProperty) {
throw error('unexpected body text <' + text + '>');
}
BodyHandler.prototype.handleText.call(this, text);
};
ElementHandler.prototype.handleEnd = function() {
var value = this.body,
element = this.element,
descriptor = getModdleDescriptor(element),
bodyProperty = descriptor.bodyProperty;
if (bodyProperty && value !== undefined) {
value = coerceType(bodyProperty.type, value);
element.set(bodyProperty.name, value);
}
};
/**
* Create an instance of the model from the given node.
*
* @param {Element} node the xml node
*/
ElementHandler.prototype.createElement = function(node) {
var attributes = node.attributes,
Type = this.type,
descriptor = getModdleDescriptor(Type),
context = this.context,
instance = new Type({}),
model = this.model,
propNameNs;
forEach(attributes, function(value, name) {
var prop = descriptor.propertiesByName[name],
values;
if (prop && prop.isReference) {
if (!prop.isMany) {
context.addReference({
element: instance,
property: prop.ns.name,
id: value
});
} else {
// IDREFS: parse references as whitespace-separated list
values = value.split(' ');
forEach(values, function(v) {
context.addReference({
element: instance,
property: prop.ns.name,
id: v
});
});
}
} else {
if (prop) {
value = coerceType(prop.type, value);
} else if (name === 'xmlns') {
name = ':' + name;
} else {
propNameNs = parseNameNS(name, descriptor.ns.prefix);
// check whether attribute is defined in a well-known namespace
// if that is the case we emit a warning to indicate potential misuse
if (model.getPackage(propNameNs.prefix)) {
context.addWarning({
message: 'unknown attribute <' + name + '>',
element: instance,
property: name,
value: value
});
}
}
instance.set(name, value);
}
});
return instance;
};
ElementHandler.prototype.getPropertyForNode = function(node) {
var name = node.name;
var nameNs = parseNameNS(name);
var type = this.type,
model = this.model,
descriptor = getModdleDescriptor(type);
var propertyName = nameNs.name,
property = descriptor.propertiesByName[propertyName];
// search for properties by name first
if (property && !property.isAttr) {
const serializationType = getSerializationType(property);
if (serializationType) {
const elementTypeName = node.attributes[serializationType];
// type is optional, if it does not exists the
// default type is assumed
if (elementTypeName) {
// convert the prefix used to the mapped form, but also
// take possible type prefixes from XML
// into account, i.e.: xsi:type="t{ActualType}",
const normalizedTypeName = normalizeTypeName(elementTypeName, node.ns, model);
const elementType = model.getType(normalizedTypeName);
return assign({}, property, {
effectiveType: getModdleDescriptor(elementType).name
});
}
}
// search for properties by name first
return property;
}
var pkg = model.getPackage(nameNs.prefix);
if (pkg) {
const elementTypeName = aliasToName(nameNs, pkg);
const elementType = model.getType(elementTypeName);
// search for collection members later
property = find(descriptor.properties, function(p) {
return !p.isVirtual && !p.isReference && !p.isAttribute && elementType.hasType(p.type);
});
if (property) {
return assign({}, property, {
effectiveType: getModdleDescriptor(elementType).name
});
}
} else {
// parse unknown element (maybe extension)
property = find(descriptor.properties, function(p) {
return !p.isReference && !p.isAttribute && p.type === 'Element';
});
if (property) {
return property;
}
}
throw error('unrecognized element <' + nameNs.name + '>');
};
ElementHandler.prototype.toString = function() {
return 'ElementDescriptor[' + getModdleDescriptor(this.type).name + ']';
};
ElementHandler.prototype.valueHandler = function(propertyDesc, element) {
return new ValueHandler(propertyDesc, element);
};
ElementHandler.prototype.referenceHandler = function(propertyDesc) {
return new ReferenceHandler(propertyDesc, this.context);
};
ElementHandler.prototype.handler = function(type) {
if (type === 'Element') {
return new GenericElementHandler(this.model, type, this.context);
} else {
return new ElementHandler(this.model, type, this.context);
}
};
/**
* Handle the child element parsing
*
* @param {Element} node the xml node
*/
ElementHandler.prototype.handleChild = function(node) {
var propertyDesc, type, element, childHandler;
propertyDesc = this.getPropertyForNode(node);
element = this.element;
type = propertyDesc.effectiveType || propertyDesc.type;
if (isSimpleType(type)) {
return this.valueHandler(propertyDesc, element);
}
if (propertyDesc.isReference) {
childHandler = this.referenceHandler(propertyDesc).handleNode(node);
} else {
childHandler = this.handler(type).handleNode(node);
}
var newElement = childHandler.element;
// child handles may decide to skip elements
// by not returning anything
if (newElement !== undefined) {
if (propertyDesc.isMany) {
element.get(propertyDesc.name).push(newElement);
} else {
element.set(propertyDesc.name, newElement);
}
if (propertyDesc.isReference) {
assign(newElement, {
element: element
});
this.context.addReference(newElement);
} else {
// establish child -> parent relationship
newElement.$parent = element;
}
}
return childHandler;
};
/**
* An element handler that performs special validation
* to ensure the node it gets initialized with matches
* the handlers type (namespace wise).
*
* @param {Moddle} model
* @param {String} typeName
* @param {Context} context
*/
function RootElementHandler(model, typeName, context) {
ElementHandler.call(this, model, typeName, context);
}
RootElementHandler.prototype = Object.create(ElementHandler.prototype);
RootElementHandler.prototype.createElement = function(node) {
var name = node.name,
nameNs = parseNameNS(name),
model = this.model,
type = this.type,
pkg = model.getPackage(nameNs.prefix),
typeName = pkg && aliasToName(nameNs, pkg) || name;
// verify the correct namespace if we parse
// the first element in the handler tree
//
// this ensures we don't mistakenly import wrong namespace elements
if (!type.hasType(typeName)) {
throw error('unexpected element <' + node.originalName + '>');
}
return ElementHandler.prototype.createElement.call(this, node);
};
function GenericElementHandler(model, typeName, context) {
this.model = model;
this.context = context;
}
GenericElementHandler.prototype = Object.create(BaseElementHandler.prototype);
GenericElementHandler.prototype.createElement = function(node) {
var name = node.name,
ns = parseNameNS(name),
prefix = ns.prefix,
uri = node.ns[prefix + '$uri'],
attributes = node.attributes;
return this.model.createAny(name, uri, attributes);
};
GenericElementHandler.prototype.handleChild = function(node) {
var handler = new GenericElementHandler(this.model, 'Element', this.context).handleNode(node),
element = this.element;
var newElement = handler.element,
children;
if (newElement !== undefined) {
children = element.$children = element.$children || [];
children.push(newElement);
// establish child -> parent relationship
newElement.$parent = element;
}
return handler;
};
GenericElementHandler.prototype.handleEnd = function() {
if (this.body) {
this.element.$body = this.body;
}
};
/**
* A reader for a meta-model
*
* @param {Object} options
* @param {Model} options.model used to read xml files
* @param {Boolean} options.lax whether to make parse errors warnings
*/
export function Reader(options) {
if (options instanceof Moddle) {
options = {
model: options
};
}
assign(this, { lax: false }, options);
}
/**
* The fromXML result.
*
* @typedef {Object} ParseResult
*
* @property {ModdleElement} rootElement
* @property {Array<Object>} references
* @property {Array<Error>} warnings
* @property {Object} elementsById - a mapping containing each ID -> ModdleElement
*/
/**
* The fromXML result.
*
* @typedef {Error} ParseError
*
* @property {Array<Error>} warnings
*/
/**
* Parse the given XML into a moddle document tree.
*
* @param {String} xml
* @param {ElementHandler|Object} options or rootHandler
*
* @returns {Promise<ParseResult, ParseError>}
*/
Reader.prototype.fromXML = function(xml, options, done) {
var rootHandler = options.rootHandler;
if (options instanceof ElementHandler) {
// root handler passed via (xml, { rootHandler: ElementHandler }, ...)
rootHandler = options;
options = {};
} else {
if (typeof options === 'string') {
// rootHandler passed via (xml, 'someString', ...)
rootHandler = this.handler(options);
options = {};
} else if (typeof rootHandler === 'string') {
// rootHandler passed via (xml, { rootHandler: 'someString' }, ...)
rootHandler = this.handler(rootHandler);
}
}
var model = this.model,
lax = this.lax;
var context = new Context(assign({}, options, { rootHandler: rootHandler })),
parser = new SaxParser({ proxy: true }),
stack = createStack();
rootHandler.context = context;
// push root handler
stack.push(rootHandler);
/**
* Handle error.
*
* @param {Error} err
* @param {Function} getContext
* @param {boolean} lax
*
* @return {boolean} true if handled
*/
function handleError(err, getContext, lax) {
var ctx = getContext();
var line = ctx.line,
column = ctx.column,
data = ctx.data;
// we receive the full context data here,
// for elements trim down the information
// to the tag name, only
if (data.charAt(0) === '<' && data.indexOf(' ') !== -1) {
data = data.slice(0, data.indexOf(' ')) + '>';
}
var message =
'unparsable content ' + (data ? data + ' ' : '') + 'detected\n\t' +
'line: ' + line + '\n\t' +
'column: ' + column + '\n\t' +
'nested error: ' + err.message;
if (lax) {
context.addWarning({
message: message,
error: err
});
return true;
} else {
throw error(message);
}
}
function handleWarning(err, getContext) {
// just like handling errors in <lax=true> mode
return handleError(err, getContext, true);
}
/**
* Resolve collected references on parse end.
*/
function resolveReferences() {
var elementsById = context.elementsById;
var references = context.references;
var i, r;
for (i = 0; (r = references[i]); i++) {
var element = r.element;
var reference = elementsById[r.id];
var property = getModdleDescriptor(element).propertiesByName[r.property];
if (!reference) {
context.addWarning({
message: 'unresolved reference <' + r.id + '>',
element: r.element,
property: r.property,
value: r.id
});
}
if (property.isMany) {
var collection = element.get(property.name),
idx = collection.indexOf(r);
// we replace an existing place holder (idx != -1) or
// append to the collection instead
if (idx === -1) {
idx = collection.length;
}
if (!reference) {
// remove unresolvable reference
collection.splice(idx, 1);
} else {
// add or update reference in collection
collection[idx] = reference;
}
} else {
element.set(property.name, reference);
}
}
}
function handleClose() {
stack.pop().handleEnd();
}
var PREAMBLE_START_PATTERN = /^<\?xml /i;
var ENCODING_PATTERN = / encoding="([^"]+)"/i;
var UTF_8_PATTERN = /^utf-8$/i;
function handleQuestion(question) {
if (!PREAMBLE_START_PATTERN.test(question)) {
return;
}
var match = ENCODING_PATTERN.exec(question);
var encoding = match && match[1];
if (!encoding || UTF_8_PATTERN.test(encoding)) {
return;
}
context.addWarning({
message:
'unsupported document encoding <' + encoding + '>, ' +
'falling back to UTF-8'
});
}
function handleOpen(node, getContext) {
var handler = stack.peek();
try {
stack.push(handler.handleNode(node));
} catch (err) {
if (handleError(err, getContext, lax)) {
stack.push(new NoopHandler());
}
}
}
function handleCData(text, getContext) {
try {
stack.peek().handleText(text);
} catch (err) {
handleWarning(err, getContext);
}
}
function handleText(text, getContext) {
// strip whitespace only nodes, i.e. before
// <!CDATA[ ... ]> sections and in between tags
if (!text.trim()) {
return;
}
handleCData(text, getContext);
}
var uriMap = model.getPackages().reduce(function(uriMap, p) {
uriMap[p.uri] = p.prefix;
return uriMap;
}, Object.entries(DEFAULT_NS_MAP).reduce(function(map, [ prefix, url ]) {
map[url] = prefix;
return map;
}, model.config && model.config.nsMap || {}));
parser
.ns(uriMap)
.on('openTag', function(obj, decodeStr, selfClosing, getContext) {
// gracefully handle unparsable attributes (attrs=false)
var attrs = obj.attrs || {};
var decodedAttrs = Object.keys(attrs).reduce(function(d, key) {
var value = decodeStr(attrs[key]);
d[key] = value;
return d;
}, {});
var node = {
name: obj.name,
originalName: obj.originalName,
attributes: decodedAttrs,
ns: obj.ns
};
handleOpen(node, getContext);
})
.on('question', handleQuestion)
.on('closeTag', handleClose)
.on('cdata', handleCData)
.on('text', function(text, decodeEntities, getContext) {
handleText(decodeEntities(text), getContext);
})
.on('error', handleError)
.on('warn', handleWarning);
// async XML parsing to make sure the execution environment
// (node or brower) is kept responsive and that certain optimization
// strategies can kick in.
return new Promise(function(resolve, reject) {
var err;
try {
parser.parse(xml);
resolveReferences();
} catch (e) {
err = e;
}
var rootElement = rootHandler.element;
if (!err && !rootElement) {
err = error('failed to parse document as <' + rootHandler.type.$descriptor.name + '>');
}
var warnings = context.warnings;
var references = context.references;
var elementsById = context.elementsById;
if (err) {
err.warnings = warnings;
return reject(err);
} else {
return resolve({
rootElement: rootElement,
elementsById: elementsById,
references: references,
warnings: warnings
});
}
});
};
Reader.prototype.handler = function(name) {
return new RootElementHandler(this.model, name);
};
// helpers //////////////////////////
function createStack() {
var stack = [];
Object.defineProperty(stack, 'peek', {
value: function() {
return this[this.length - 1];
}
});
return stack;
}