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Connection,
Diagnostic,
DiagnosticSeverity,
Range,
} from 'vscode-languageserver/browser';
import { TextDocument } from 'vscode-languageserver-textdocument';
import { LanguageServerBase } from '@src/languages/language-server';
import { XmlParseResult } from './xml-types';
// Inline namespace constants to avoid importing @faubulous/mentor-rdf which has CommonJS dependencies
const _RDF = 'http://www.w3.org/1999/02/22-rdf-syntax-ns#';
const _RDFS = 'http://www.w3.org/2000/01/rdf-schema#';
const _OWL = 'http://www.w3.org/2002/07/owl#';
const _SH = 'http://www.w3.org/ns/shacl#';
const _SKOS = 'http://www.w3.org/2004/02/skos/core#';
const _SKOS_XL = 'http://www.w3.org/2008/05/skos-xl#';
// XML NCName character class per the XML Namespaces 1.0 spec:
// letters, digits, hyphens, periods, underscores (and Unicode ranges, approximated by \w).
const _NC_NAME = '[\\w\\-.]';
export class XmlLanguageServer extends LanguageServerBase {
constructor(connection: Connection) {
super(connection, 'xml', 'RDF/XML');
}
override async validateTextDocument(document: TextDocument): Promise<void> {
if (!this?.connection) {
return;
}
this.log(`Validating document: ${document.uri}`);
const content = document.getText();
const diagnostics: Diagnostic[] = [];
Eif (content.length) {
try {
const result = await this.parseXml(document);
// Send the parsed data to the client
this.connection.sendNotification('mentor.message.updateContext', {
uri: document.uri,
languageId: this.languageId,
parsedData: result
});
} catch (e) {
diagnostics.push({
severity: DiagnosticSeverity.Error,
message: e ? e.toString() : "An error occurred while parsing the document.",
range: Range.create(0, 0, 0, 0)
});
}
}
this.connection.sendDiagnostics({ uri: document.uri, diagnostics });
}
protected async parseXml(document: TextDocument): Promise<XmlParseResult> {
const data = document.getText();
const lines = data.split('\n');
const result: XmlParseResult = {
namespaces: {},
namespaceDefinitions: {},
subjects: {},
references: {},
typeAssertions: {},
typeDefinitions: {},
textLiteralRanges: []
};
// Parse DOCTYPE for entity definitions
this._parseDoctypeEntities(data, result);
// Parse namespace definitions and xml:base
this._parseNamespaces(lines, result);
// Parse elements and attributes
this._parseElements(lines, result);
return result;
}
private _parseDoctypeEntities(data: string, result: XmlParseResult): void {
// Match DOCTYPE section
const doctype = data.match(/<!DOCTYPE[^>]*\[([^\]]*)\]>/s);
if (!doctype) {
return;
}
const lines = data.substring(0, data.indexOf(doctype[0]) + doctype[0].length).split('\n');
const doctypeContent = doctype[1];
const doctypeStartLine = lines.length - doctypeContent.split('\n').length;
// Find ENTITY definitions
const entityRegex = new RegExp(`<!ENTITY\\s+(${_NC_NAME}+)\\s+"([^"]+)">`, 'g');
let match;
while ((match = entityRegex.exec(doctypeContent)) !== null) {
const prefix = match[1];
const namespaceIri = match[2];
// Find line number for this entity
const beforeMatch = doctypeContent.substring(0, match.index);
const lineOffset = beforeMatch.split('\n').length - 1;
const lineNumber = doctypeStartLine + lineOffset;
// Find column position
const lineStart = beforeMatch.lastIndexOf('\n') + 1;
const lineText = doctypeContent.substring(lineStart);
const column = lineText.indexOf(prefix);
result.namespaces[prefix] = namespaceIri;
Eif (!result.namespaceDefinitions[prefix]) {
result.namespaceDefinitions[prefix] = [];
}
result.namespaceDefinitions[prefix].push(Range.create(
lineNumber, column,
lineNumber, column + prefix.length
));
}
}
private _parseNamespaces(lines: string[], result: XmlParseResult): void {
for (let lineNumber = 0; lineNumber < lines.length; lineNumber++) {
const line = lines[lineNumber];
// Check for xml:base attribute
const base = line.match(/xml:base\s*=\s*["']([^"']+)["']/i);
if (base) {
result.baseIri = base[1];
}
// Find xmlns definitions
const xmlnsRegex = new RegExp(`xmlns:(${_NC_NAME}+)\\s*=\\s*["']([^"']+)["']`, 'gi');
let nsMatch;
while ((nsMatch = xmlnsRegex.exec(line)) !== null) {
const prefix = nsMatch[1].toLowerCase();
const namespaceIri = nsMatch[2];
const column = nsMatch.index + 6; // "xmlns:" length
result.namespaces[prefix] = namespaceIri;
Eif (!result.namespaceDefinitions[prefix]) {
result.namespaceDefinitions[prefix] = [];
}
result.namespaceDefinitions[prefix].push(Range.create(
lineNumber, column,
lineNumber, column + prefix.length
));
}
}
}
private _parseElements(lines: string[], result: XmlParseResult): void {
// Track element positions for text literal detection
let inElement = false;
let elementEndLine = -1;
let elementEndColumn = -1;
for (let lineNumber = 0; lineNumber < lines.length; lineNumber++) {
const line = lines[lineNumber];
// Find opening tags with prefixes (e.g., <owl:Class, <rdf:Property)
const tagRegex = new RegExp(`<(${_NC_NAME}+):(${_NC_NAME}+)`, 'g');
let tag;
while ((tag = tagRegex.exec(line)) !== null) {
const prefix = tag[1].toLowerCase();
const namespaceIri = result.namespaces[prefix];
const localName = tag[2].toLowerCase();
const fullName = `${prefix}:${localName}`;
const column = tag.index + 1; // After '<'
if (namespaceIri && !this._isXmlSpecificTagName(prefix, localName, namespaceIri)) {
const iri = namespaceIri + localName;
Iif (namespaceIri === 'https://spec.industrialontologies.org/ontology/construct/') {
console.log(`Found construct reference (${iri}) at line ${lineNumber}`);
}
Iif (iri === "https://spec.industrialontologies.org/ontology/construct/MeasurementCapability") {
console.log("Found MeasurementCapability reference at line " + lineNumber);
}
this._addRangeToIndex(result.references, iri, Range.create(
lineNumber, column,
lineNumber, column + fullName.length
));
}
// Track element end for text literal detection
const tagEnd = line.indexOf('>', tag.index);
if (tagEnd !== -1) {
const isSelfClosing = line[tagEnd - 1] === '/';
if (!isSelfClosing) {
inElement = true;
elementEndLine = lineNumber;
elementEndColumn = tagEnd + 1;
}
}
}
// Find rdf:about, rdf:resource, rdf:datatype attributes
this._parseRdfAttributes(line, lineNumber, result);
// Track text content for literal ranges
if (inElement) {
const closeTagMatch = line.match(new RegExp(`<\\/(${_NC_NAME}+:${_NC_NAME}+)>`));
if (closeTagMatch) {
const textEndColumn = line.indexOf(closeTagMatch[0]);
Eif (textEndColumn > elementEndColumn || lineNumber > elementEndLine) {
// Check if there's actual text content
let hasText = false;
if (lineNumber === elementEndLine) {
hasText = line.substring(elementEndColumn, textEndColumn).trim().length > 0;
} else {
hasText = true; // Multi-line content, assume text exists
}
Eif (hasText) {
result.textLiteralRanges.push(Range.create(
elementEndLine, elementEndColumn,
lineNumber, textEndColumn
));
}
}
inElement = false;
}
}
}
}
private _parseRdfAttributes(line: string, lineNumber: number, result: XmlParseResult): void {
// Match rdf:about, rdf:resource, rdf:datatype attributes
const attrRegex = /rdf:(about|resource|datatype)\s*=\s*["']([^"']+)["']/gi;
let attrMatch;
while ((attrMatch = attrRegex.exec(line)) !== null) {
const attrName = attrMatch[1].toLowerCase();
const attrValue = attrMatch[2];
// Find the column where the value starts (inside quotes)
const valueStart = line.indexOf(attrValue, attrMatch.index);
const range = Range.create(
lineNumber, valueStart,
lineNumber, valueStart + attrValue.length
);
const iri = this._getIriFromXmlString(attrValue, result.namespaces, result.baseIri);
Eif (iri) {
this._addRangeToIndex(result.references, iri, range);
Eif (attrName === 'about') {
this._addRangeToIndex(result.subjects, iri, range);
// Check if this is a typed subject (not rdf:Description)
const tag = line.match(new RegExp(`<(${_NC_NAME}+):(${_NC_NAME}+)`));
Eif (tag) {
const tagPrefix = tag[1].toLowerCase();
const tagLocal = tag[2].toLowerCase();
const tagNamespace = result.namespaces[tagPrefix];
// If the tag is not rdf:Description, we treat the subject as
// having the type of the tag name.
if (tagNamespace !== _RDF && tagLocal !== 'description') {
this._addRangeToIndex(result.typeAssertions, iri, range);
if (this._isDefinitionNamespace(tagNamespace)) {
this._addRangeToIndex(result.typeDefinitions, iri, range);
}
}
}
}
}
}
}
private _getIriFromXmlString(value: string, namespaces: { [key: string]: string }, baseIri?: string): string | undefined {
if (value.startsWith('&')) {
const prefix = value.trim().split(';')[0].substring(1);
const namespaceIri = namespaces[prefix];
Eif (namespaceIri) {
const localName = value.split(';')[1];
return namespaceIri + localName;
}
}
else if (value.startsWith('#') || !value.includes(':')) {
return baseIri ? baseIri + value : value;
} else if (Evalue.length > 0) {
const schemeOrPrefix = value.split(':')[0];
if (namespaces[schemeOrPrefix]) {
return namespaces[schemeOrPrefix] + value.split(':')[1];
} else {
return value;
}
}
}
private _addRangeToIndex(index: { [key: string]: Range[] }, iri: string, range: Range): void {
if (!index[iri]) {
index[iri] = [range];
} else {
index[iri].push(range);
}
}
private _isXmlSpecificTagName(prefix: string, localName: string, namespaceIri: string): boolean {
const _XML = 'http://www.w3.org/XML/1998/namespace';
if (namespaceIri === _XML) {
return true;
}
if (namespaceIri === _RDF) {
switch (localName) {
case 'about':
case 'rdf':
case 'resource':
case 'description':
case 'datatype':
case 'parsetype':
return true;
}
}
return false;
}
private _isDefinitionNamespace(namespaceIri: string | undefined): boolean {
Iif (!namespaceIri) return false;
switch (namespaceIri) {
case _RDF:
case _RDFS:
case _OWL:
case _SKOS:
case _SKOS_XL:
case _SH:
return true;
}
return false;
}
}
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