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* @fileoverview XML parser for European Parliament DOCEO vote documents
*
* Parses two types of EP plenary vote XML documents:
* - **RCV** (Roll-Call Votes): Individual MEP voting positions by political group
* - **VOT** (Vote Results): Aggregate vote results with subject descriptions
*
* XML source: `https://www.europarl.europa.eu/doceo/document/PV-{term}-{date}-{type}_EN.xml`
*
* @module clients/ep/doceoXmlParser
* @security Input sanitization applied to all parsed XML text content
*/
/**
* Represents an individual MEP's vote from the RCV XML.
*/
export interface RcvMepVote {
/** MEP identifier from the XML (MepId attribute) */
mepId: string;
/** MEP full name */
name: string;
/** Political group abbreviation */
politicalGroup: string;
/** ISO 3166-1 alpha-2 country code from the Country attribute (optional) */
country?: string;
}
/**
* Parsed roll-call vote result from RCV XML.
*/
export interface RcvVoteResult {
/** Vote number/identifier within the session */
voteId: string;
/** Description/subject of the vote */
description: string;
/** Reference (e.g., procedure reference like "A10-0123/2026") */
reference: string;
/** MEPs who voted FOR */
votesFor: RcvMepVote[];
/** MEPs who voted AGAINST */
votesAgainst: RcvMepVote[];
/** MEPs who ABSTAINED */
abstentions: RcvMepVote[];
/** Intended result interpretation */
result: 'ADOPTED' | 'REJECTED';
/** Sitting date from Date attribute on RollCallVote.Result (YYYY-MM-DD; empty string if absent) */
sittingDate: string;
/** Sitting number from Number.Sitting attribute (empty string if absent) */
sittingNumber: string;
/** Vote type from Type attribute on RollCallVote.Result (empty string if absent) */
voteType: string;
/** Official FOR count from Number attribute on Result.For; falls back to MEP count */
officialForCount: number;
/** Official AGAINST count from Number attribute on Result.Against; falls back to MEP count */
officialAgainstCount: number;
/** Official ABSTENTION count from Number attribute on Result.Abstention; falls back to MEP count */
officialAbstentionCount: number;
/** MEPs listed in the Correction element (empty array if absent) */
corrections: RcvMepVote[];
}
/**
* Parsed vote result from VOT XML (aggregate format).
*/
export interface VotVoteResult {
/** Vote item number */
itemNumber: string;
/** Subject/title of the vote */
subject: string;
/** Document reference */
reference: string;
/** Number of votes in favor */
votesFor: number;
/** Number of votes against */
votesAgainst: number;
/** Number of abstentions */
abstentions: number;
/** Vote outcome */
result: 'ADOPTED' | 'REJECTED';
/** Vote type (e.g., "single", "split", "separate", "amendment") */
voteType: string;
/** Title of the parent Table element (empty string if absent) */
tableTitle: string;
/** Row/Vote.Result Type attribute value (empty string if absent) */
rowType: string;
/** Official FOR count from For attribute on Result.Group (0 if absent) */
officialForCount: number;
/** Official AGAINST count from Against attribute on Result.Group (0 if absent) */
officialAgainstCount: number;
/** Official ABSTENTION count from Abst attribute on Result.Group (0 if absent) */
officialAbstentionCount: number;
}
/**
* Combined latest votes result merging RCV and VOT data.
*/
export interface LatestVoteRecord {
/** Unique vote identifier */
id: string;
/** Session date (YYYY-MM-DD) */
date: string;
/** Parliamentary term number */
term: number;
/** Subject/description of the vote */
subject: string;
/** Document/procedure reference */
reference: string;
/** Total votes in favor */
votesFor: number;
/** Total votes against */
votesAgainst: number;
/** Total abstentions */
abstentions: number;
/** Vote outcome */
result: 'ADOPTED' | 'REJECTED';
/** Individual MEP votes (from RCV data, keyed by mepId) */
mepVotes?: Record<string, 'FOR' | 'AGAINST' | 'ABSTAIN'>;
/** Political group breakdown of votes */
groupBreakdown?: Record<string, { for: number; against: number; abstain: number }>;
/** Source URL of the XML document */
sourceUrl: string;
/** Which XML document type provided the data */
dataSource: 'RCV' | 'VOT';
/** Vote type from the XML Type attribute (optional) */
voteType?: string;
/** Sitting date from RCV data (YYYY-MM-DD; optional) */
sittingDate?: string;
/** Sitting number from RCV data (optional) */
sittingNumber?: string;
/** Official counts from XML Number/For/Against/Abst attributes (optional) */
officialCounts?: { for: number; against: number; abstentions: number };
/** Vote corrections from RCV Correction element (optional) */
corrections?: RcvMepVote[];
}
/**
* Sanitize XML text content to prevent injection issues.
* Decodes common XML entities, strips control characters, and trims whitespace.
*/
function sanitizeText(text: string): string {
return decodeXmlEntities(text).replace(/[\x00-\x08\x0B\x0C\x0E-\x1F]/g, '').trim();
}
/**
* Extract text content between XML tags using regex.
* This is a lightweight parser that avoids adding heavy XML parsing dependencies.
*/
function extractTagContent(xml: string, tagName: string): string[] {
const regex = new RegExp(`<${tagName}[^>]*>([\\s\\S]*?)</${tagName}>`, 'gi');
return [...xml.matchAll(regex)].map(m => sanitizeText(m[1] ?? ''));
}
/**
* Decode common XML character entities in an attribute value using a single-pass
* replacement map. Decodes & < > " ' to their literal characters.
*/
function decodeXmlEntities(value: string): string {
const XML_ENTITIES: Record<string, string> = {
amp: '&',
lt: '<',
gt: '>',
quot: '"',
apos: "'",
};
return value.replace(/&(amp|lt|gt|quot|apos);/g, (_, entity: string) => XML_ENTITIES[entity] ?? `&${entity};`);
}
/**
* Extract a single attribute value from an XML element string.
*/
function extractAttribute(element: string, attrName: string): string {
const regex = new RegExp(`${attrName}="([^"]*)"`, 'i');
const match = regex.exec(element);
return sanitizeText(match?.[1] ?? '');
}
/**
* Extract full element strings matching a tag name.
*/
function extractElements(xml: string, tagName: string): string[] {
const regex = new RegExp(`<${tagName}[^>]*(?:/>|>[\\s\\S]*?</${tagName}>)`, 'gi');
return [...xml.matchAll(regex)].map(m => m[0]);
}
/**
* Extract MEP vote entries from an RCV result section (For/Against/Abstention).
*/
function parseRcvMepVotes(sectionXml: string): RcvMepVote[] {
const votes: RcvMepVote[] = [];
const groupElements = extractElements(sectionXml, 'PoliticalGroup\\.List');
if (groupElements.length === 0) {
const altGroups = extractElements(sectionXml, 'Result\\.PoliticalGroup\\.List');
for (const groupSection of altGroups) {
parseGroupSection(groupSection, votes);
}
const directGroups = extractElements(sectionXml, 'PoliticalGroup');
for (const groupEl of directGroups) {
parseGroupSection(groupEl, votes);
}
} else {
for (const groupSection of groupElements) {
parseGroupSection(groupSection, votes);
}
}
return votes;
}
/**
* Parse a political group section and extract member votes.
*/
function parseGroupSection(groupXml: string, votes: RcvMepVote[]): void {
const groupName = extractAttribute(groupXml, 'Identifier') ||
extractAttribute(groupXml, 'Name') || 'Unknown';
const memberTagRegex = /<(?:PoliticalGroup\.Member\.Name|Member\.Name|Name)([^>]*)>([^<]*)</gi;
for (const memberMatch of groupXml.matchAll(memberTagRegex)) {
const attrs = memberMatch[1] ?? '';
const name = sanitizeText(memberMatch[2] ?? '');
const mepId = extractAttribute(attrs, 'MepId');
const country = extractAttribute(attrs, 'Country');
Eif (mepId !== '' && name !== '') {
const vote: RcvMepVote = { mepId, name, politicalGroup: groupName };
if (country !== '') vote.country = country;
votes.push(vote);
}
}
}
/**
* Extract the official count from a Result.For/Against/Abstention element.
* Falls back to the parsed MEP array length when the Number attribute is absent.
*/
function extractOfficialCount(section: string | undefined, fallback: number): number {
if (section === undefined) return fallback;
const raw = extractAttribute(section, 'Number');
const parsed = parseInt(raw, 10);
return Number.isNaN(parsed) ? fallback : parsed;
}
/**
* Parse a FOR/AGAINST/ABSTENTION/CORRECTION section element into votes + official count.
* Extracts all votes in a section element using the appropriate tag name.
*/
function parseRcvMepSection(voteXml: string, tagName: string): { votes: RcvMepVote[]; count: number } {
const section = extractElements(voteXml, tagName)[0];
const votes = section !== undefined ? parseRcvMepVotes(section) : [];
return { votes, count: extractOfficialCount(section, votes.length) };
}
/**
* Resolve VOT vote counts, preferring official Result.Group attributes over tag content.
*/
function resolveVotCounts(row: string): { for: number; against: number; abst: number } {
const rg = extractResultGroupCounts(row);
return {
for: rg.for > 0 ? rg.for : parseVoteCount(extractTagContent(row, 'For')[0]),
against: rg.against > 0 ? rg.against : parseVoteCount(extractTagContent(row, 'Against')[0]),
abst: rg.abst > 0 ? rg.abst : parseVoteCount(extractTagContent(row, 'Abstention')[0]),
};
}
/**
* Select effective vote type, preferring rowType (Table/Row format) over voteType.
* Returns undefined when both are empty strings.
*/
function pickVoteType(rowType: string, voteType: string): string | undefined {
if (rowType !== '') return rowType;
if (voteType !== '') return voteType;
return undefined;
}
/**
* Parse a single RCV vote element into a structured result.
*/
function parseSingleRcvVote(voteXml: string, fallbackId: string): RcvVoteResult {
const voteId = extractAttribute(voteXml, 'Identifier') ||
extractAttribute(voteXml, 'Number') ||
fallbackId;
const sittingDate = extractAttribute(voteXml, 'Date');
const sittingNumber = extractAttribute(voteXml, 'Number\\.Sitting');
const voteType = extractAttribute(voteXml, 'Type');
const descTexts = extractTagContent(voteXml, 'RollCallVote\\.Description\\.Text');
const fallbackDesc = extractTagContent(voteXml, 'Description\\.Text');
const description = descTexts[0] ?? fallbackDesc[0] ?? '';
const refTexts = extractTagContent(voteXml, 'RollCallVote\\.Reference');
const reference = refTexts[0] ?? extractAttribute(voteXml, 'Reference');
const forData = parseRcvMepSection(voteXml, 'Result\\.For');
const againstData = parseRcvMepSection(voteXml, 'Result\\.Against');
const abstData = parseRcvMepSection(voteXml, 'Result\\.Abstention');
const corrData = parseRcvMepSection(voteXml, 'Correction');
const result: 'ADOPTED' | 'REJECTED' = forData.count > againstData.count ? 'ADOPTED' : 'REJECTED';
return {
voteId,
description: sanitizeText(description),
reference: sanitizeText(reference),
votesFor: forData.votes,
votesAgainst: againstData.votes,
abstentions: abstData.votes,
result,
sittingDate,
sittingNumber,
voteType,
officialForCount: forData.count,
officialAgainstCount: againstData.count,
officialAbstentionCount: abstData.count,
corrections: corrData.votes,
};
}
/**
* Parse a complete RCV XML document into structured vote results.
*
* @param xml - Raw XML string from RCV document
* @returns Array of parsed roll-call vote results
*/
export function parseRcvXml(xml: string): RcvVoteResult[] {
const voteElements = extractElements(xml, 'RollCallVote\\.Result');
const voteElems = voteElements.length > 0 ? voteElements : extractElements(xml, 'RollCallVote');
return voteElems.map((voteXml, idx) =>
parseSingleRcvVote(voteXml, String(idx + 1))
);
}
/**
* Parse a single VOT row into a structured result.
*/
/**
* Determine vote outcome from result text.
*/
function determineVotOutcome(resultStr: string): 'ADOPTED' | 'REJECTED' {
const upper = resultStr.toUpperCase();
return upper.includes('ADOPT') || upper.includes('+') ? 'ADOPTED' : 'REJECTED';
}
/**
* Extract official counts from a Result.Group element.
*/
function extractResultGroupCounts(row: string): { for: number; against: number; abst: number } {
const rgSections = extractElements(row, 'Result\\.Group');
const rg = rgSections[0];
if (rg === undefined) return { for: 0, against: 0, abst: 0 };
return {
for: parseInt(extractAttribute(rg, 'For'), 10) || 0,
against: parseInt(extractAttribute(rg, 'Against'), 10) || 0,
abst: parseInt(extractAttribute(rg, 'Abst'), 10) || 0,
};
}
/**
* Extract the best available result string from a VOT row.
*/
function extractVotResultString(row: string): string {
return extractTagContent(row, 'Result')[0] ??
extractTagContent(row, 'Row\\.Result')[0] ??
'';
}
/**
* Parse a single VOT row into a structured result.
*/
function parseSingleVotResult(row: string, fallbackNumber: string, tableTitle = ''): VotVoteResult {
const itemNumber = extractAttribute(row, 'Number') ||
extractAttribute(row, 'Item') ||
fallbackNumber;
const rowType = extractAttribute(row, 'Type');
const subject = extractTagContent(row, 'Subject')[0] ??
extractTagContent(row, 'Title')[0] ??
extractTagContent(row, 'Description')[0] ??
tableTitle;
const reference = extractTagContent(row, 'Reference')[0] ?? '';
const counts = resolveVotCounts(row);
const resultStr = extractVotResultString(row);
const voteType = extractAttribute(row, 'Type') ||
(extractTagContent(row, 'VoteType')[0] ?? 'single');
return {
itemNumber,
subject: sanitizeText(subject),
reference: sanitizeText(reference),
votesFor: counts.for,
votesAgainst: counts.against,
abstentions: counts.abst,
result: determineVotOutcome(resultStr),
voteType: sanitizeText(voteType),
tableTitle: sanitizeText(tableTitle),
rowType: sanitizeText(rowType),
officialForCount: counts.for,
officialAgainstCount: counts.against,
officialAbstentionCount: counts.abst,
};
}
/**
* Parse VOT XML in Table/Row format, extracting table title from each Table element.
*
* @param xml - Raw XML string
* @returns Parsed results or empty array if no Table elements found
*/
function parseVotTableFormat(xml: string): VotVoteResult[] {
const tableElements = extractElements(xml, 'Table');
if (tableElements.length === 0) return [];
const results: VotVoteResult[] = [];
for (const table of tableElements) {
const tableTitle = extractAttribute(table, 'Title');
const rows = extractElements(table, 'Row');
for (const row of rows) {
results.push(parseSingleVotResult(row, String(results.length + 1), tableTitle));
}
}
return results;
}
/**
* Parse a VOT (Vote Results) XML document into structured results.
*
* Tries Table/Row format first (newer EP DOCEO format), then falls back
* to Vote.Result / Result element format.
*
* @param xml - Raw XML string from VOT document
* @returns Array of parsed aggregate vote results
*/
export function parseVotXml(xml: string): VotVoteResult[] {
const tableResults = parseVotTableFormat(xml);
if (tableResults.length > 0) return tableResults;
const rows = extractElements(xml, 'Vote\\.Result');
const voteItems = rows.length > 0 ? rows : extractElements(xml, 'Result');
return voteItems.map((row, idx) =>
parseSingleVotResult(row, String(idx + 1), '')
);
}
/**
* Parse a vote count from text, handling both numeric and empty values.
*/
function parseVoteCount(text: string | undefined): number {
Iif (text === undefined || text === '') return 0;
const num = parseInt(text.replace(/\D/g, ''), 10);
return Number.isNaN(num) ? 0 : num;
}
/** Base URL for EP DOCEO document system */
export const DOCEO_BASE_URL = 'https://www.europarl.europa.eu/doceo/document/';
/**
* Current parliamentary term number (10th Parliament: 2024-2029).
*/
export const CURRENT_PARLIAMENTARY_TERM = 10;
/**
* Build the DOCEO XML URL for a given date and document type.
*
* @param date - Date string in YYYY-MM-DD format
* @param type - Document type: 'RCV' for roll-call votes, 'VOT' for vote results
* @param term - Parliamentary term number (defaults to current term 10)
* @param language - Language code (defaults to 'EN')
* @returns Full URL to the XML document
*
* @example
* ```typescript
* buildDoceoUrl('2026-04-27', 'RCV')
* // => 'https://www.europarl.europa.eu/doceo/document/PV-10-2026-04-27-RCV_EN.xml'
* ```
*/
export function buildDoceoUrl(
date: string,
type: 'RCV' | 'VOT',
term = CURRENT_PARLIAMENTARY_TERM,
language = 'EN'
): string {
if (!/^\d{4}-\d{2}-\d{2}$/.test(date)) {
throw new Error(`Invalid date format: ${date}. Expected YYYY-MM-DD.`);
}
return `${DOCEO_BASE_URL}PV-${String(term)}-${date}-${type}_${language}.xml`;
}
/**
* Get dates for the most recent plenary week (Monday-Thursday).
* If a specific week start date is provided, uses that week.
* Otherwise calculates the most recent Monday.
*
* @param weekStart - Optional Monday date (YYYY-MM-DD) to use as start of plenary week
* @returns Array of date strings for the plenary week (Mon-Thu)
*/
export function getPlenaryWeekDates(weekStart?: string): string[] {
let monday: Date;
if (weekStart !== undefined && weekStart !== '') {
monday = new Date(`${weekStart}T00:00:00Z`);
if (isNaN(monday.getTime())) {
return [];
}
} else {
const now = new Date();
const dayOfWeek = now.getUTCDay();
const daysBack = dayOfWeek === 0 ? 6 : dayOfWeek - 1;
monday = new Date(now);
monday.setUTCDate(now.getUTCDate() - daysBack);
}
const dates: string[] = [];
for (let i = 0; i < 4; i++) {
const day = new Date(monday);
day.setUTCDate(monday.getUTCDate() + i);
dates.push(day.toISOString().slice(0, 10));
}
return dates;
}
/**
* Build group breakdown from RCV vote data.
*/
function buildGroupBreakdown(
rcv: RcvVoteResult
): Record<string, { for: number; against: number; abstain: number }> {
const breakdown: Record<string, { for: number; against: number; abstain: number }> = {};
for (const vote of rcv.votesFor) {
const group = vote.politicalGroup;
breakdown[group] ??= { for: 0, against: 0, abstain: 0 };
breakdown[group].for++;
}
for (const vote of rcv.votesAgainst) {
const group = vote.politicalGroup;
breakdown[group] ??= { for: 0, against: 0, abstain: 0 };
breakdown[group].against++;
}
for (const vote of rcv.abstentions) {
const group = vote.politicalGroup;
breakdown[group] ??= { for: 0, against: 0, abstain: 0 };
breakdown[group].abstain++;
}
return breakdown;
}
/**
* Build MEP votes map from RCV data.
*/
function buildMepVotesMap(
rcv: RcvVoteResult
): Record<string, 'FOR' | 'AGAINST' | 'ABSTAIN'> {
const map: Record<string, 'FOR' | 'AGAINST' | 'ABSTAIN'> = {};
for (const v of rcv.votesFor) map[v.mepId] = 'FOR';
for (const v of rcv.votesAgainst) map[v.mepId] = 'AGAINST';
for (const v of rcv.abstentions) map[v.mepId] = 'ABSTAIN';
return map;
}
/**
* Convert parsed RCV results into LatestVoteRecord format.
*
* @param rcvResults - Parsed RCV vote results
* @param date - Session date
* @param term - Parliamentary term
* @param sourceUrl - Source XML URL
* @returns Array of LatestVoteRecord
*/
export function rcvToLatestVotes(
rcvResults: RcvVoteResult[],
date: string,
term = CURRENT_PARLIAMENTARY_TERM,
sourceUrl = ''
): LatestVoteRecord[] {
return rcvResults.map((rcv, index) => ({
id: `RCV-${String(term)}-${date}-${String(index + 1).padStart(3, '0')}`,
date,
term,
subject: rcv.description || rcv.reference || `Vote #${String(index + 1)}`,
reference: rcv.reference,
votesFor: rcv.officialForCount,
votesAgainst: rcv.officialAgainstCount,
abstentions: rcv.officialAbstentionCount,
result: rcv.result,
mepVotes: buildMepVotesMap(rcv),
groupBreakdown: buildGroupBreakdown(rcv),
sourceUrl,
dataSource: 'RCV' as const,
...(rcv.voteType !== '' && { voteType: rcv.voteType }),
...(rcv.sittingDate !== '' && { sittingDate: rcv.sittingDate }),
...(rcv.sittingNumber !== '' && { sittingNumber: rcv.sittingNumber }),
officialCounts: {
for: rcv.officialForCount,
against: rcv.officialAgainstCount,
abstentions: rcv.officialAbstentionCount,
},
...(rcv.corrections.length > 0 && { corrections: rcv.corrections }),
}));
}
/**
* Convert parsed VOT results into LatestVoteRecord format.
*
* @param votResults - Parsed VOT vote results
* @param date - Session date
* @param term - Parliamentary term
* @param sourceUrl - Source XML URL
* @returns Array of LatestVoteRecord
*/
export function votToLatestVotes(
votResults: VotVoteResult[],
date: string,
term = CURRENT_PARLIAMENTARY_TERM,
sourceUrl = ''
): LatestVoteRecord[] {
return votResults.map((vot, index) => {
const vt = pickVoteType(vot.rowType, vot.voteType);
return {
id: `VOT-${String(term)}-${date}-${String(index + 1).padStart(3, '0')}`,
date,
term,
subject: vot.subject || vot.reference || `Vote item #${vot.itemNumber}`,
reference: vot.reference,
votesFor: vot.votesFor,
votesAgainst: vot.votesAgainst,
abstentions: vot.abstentions,
result: vot.result,
sourceUrl,
dataSource: 'VOT' as const,
...(vt !== undefined && { voteType: vt }),
officialCounts: {
for: vot.officialForCount,
against: vot.officialAgainstCount,
abstentions: vot.officialAbstentionCount,
},
};
});
}
|