feat(voyage): add anchor-parser.mjs with placement validation — v4.2 Step 3
lib/parsers/anchor-parser.mjs (~190 LoC): - parseAnchors(md) -> Anchor[] (id, target, line, snippet?, intent?) - addAnchors(md, anchors) -> md_with_anchors - stripAnchors(md_with_anchors) -> md (byte-identical) - validateAnchorPlacement(md, anchors) -> errors for list-item / fenced-block / indent Format: <!-- voyage:anchor id="ANN-NNNN" target="<slug>" line="<N>" --> Block-level only, on its own line (col 0), blank-line separation. Test fixture annotation-example.md with single ANN-0001 anchor — referenced by SC12 quickstart. 14 tests pass (parseAnchors, addAnchors, stripAnchors, validateAnchorPlacement).
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plugins/voyage/lib/parsers/anchor-parser.mjs
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plugins/voyage/lib/parsers/anchor-parser.mjs
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// lib/parsers/anchor-parser.mjs
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// Pure I/O-free parser for v4.2 voyage:anchor markdown comments.
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//
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// Anchor format (block-level only, on its own line, blank line above and below):
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// <!-- voyage:anchor id="ANN-NNNN" target="<heading-slug>" line="<N>" [snippet="<≤80c>"] [intent="fix|change|question|block"] -->
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//
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// Placement rules (validated by validateAnchorPlacement):
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// - Not in list-items (Prettier #18066 progressive-whitespace bug)
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// - Not inside fenced code blocks (```yaml`/```json`/etc.)
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// - Not at line-start positions matching: --- frontmatter delimiter,
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// manifest:, plan_version:, ### Step N:, ## <required-section>,
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// 40-char hex SHA1 (review finding-IDs)
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// - ID must match /^ANN-\d{4}$/
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// - No duplicate IDs in same document
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//
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// Returns Result shape from lib/util/result.mjs.
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import { issue, ok, fail } from '../util/result.mjs';
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const ANCHOR_LINE_RE = /^(\s*)<!--\s*voyage:anchor\s+([^>]+?)\s*-->\s*$/;
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const ATTR_RE = /(\w+)="([^"]*)"/g;
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const FENCED_OPEN_RE = /^```([a-zA-Z0-9_-]*)\s*$/;
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const FENCED_CLOSE_RE = /^```\s*$/;
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const LIST_ITEM_RE = /^\s*(?:[-*+]|\d+[.)])\s+/;
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const ID_RE = /^ANN-\d{4}$/;
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const FORBIDDEN_LINE_START = [
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/^---\s*$/,
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/^manifest:\s*$/,
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/^plan_version:/,
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/^brief_version:/,
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/^review_version:/,
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/^### Step \d+:/,
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/^## (?:Intent|Goal|Success Criteria|Executive Summary|Coverage|Remediation Summary)\b/,
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/^[0-9a-f]{40}$/,
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];
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/**
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* Parse anchor attributes string (the contents between voyage:anchor and -->).
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* @returns {object} attribute map
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*/
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function parseAttrs(s) {
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const attrs = {};
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let m;
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ATTR_RE.lastIndex = 0;
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while ((m = ATTR_RE.exec(s)) !== null) {
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attrs[m[1]] = m[2];
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}
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return attrs;
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}
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/**
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* Parse all anchor comments in a markdown document.
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* @param {string} md
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* @returns {Result} { valid, errors, warnings, parsed: Anchor[] }
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*/
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export function parseAnchors(md) {
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if (typeof md !== 'string') {
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return fail(issue('ANCHOR_INPUT', 'Input must be a string'));
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}
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const lines = md.split(/\r?\n/);
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const anchors = [];
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const errors = [];
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const warnings = [];
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const seenIds = new Set();
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let inFence = false;
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for (let i = 0; i < lines.length; i++) {
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const line = lines[i];
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if (FENCED_OPEN_RE.test(line)) {
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inFence = !inFence;
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continue;
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}
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if (inFence && FENCED_CLOSE_RE.test(line)) {
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inFence = false;
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continue;
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}
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if (inFence) continue;
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const m = line.match(ANCHOR_LINE_RE);
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if (!m) continue;
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const attrs = parseAttrs(m[2]);
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if (!attrs.id) {
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errors.push(issue('ANCHOR_MALFORMED', `Anchor at line ${i + 1} missing required id attribute`));
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continue;
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}
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if (!ID_RE.test(attrs.id)) {
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errors.push(issue('ANCHOR_BAD_ID', `Anchor id "${attrs.id}" at line ${i + 1} does not match /^ANN-\\d{4}$/`));
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continue;
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}
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if (seenIds.has(attrs.id)) {
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errors.push(issue('ANCHOR_DUPLICATE_ID', `Duplicate anchor id "${attrs.id}" at line ${i + 1}`));
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continue;
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}
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seenIds.add(attrs.id);
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if (!attrs.target) {
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errors.push(issue('ANCHOR_MALFORMED', `Anchor "${attrs.id}" at line ${i + 1} missing required target attribute`));
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continue;
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}
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if (attrs.snippet && attrs.snippet.length > 80) {
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warnings.push(issue('ANCHOR_SNIPPET_TRUNCATED', `Anchor "${attrs.id}" snippet > 80 chars (${attrs.snippet.length})`));
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}
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if (attrs.intent && !['fix', 'change', 'question', 'block'].includes(attrs.intent)) {
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warnings.push(issue('ANCHOR_BAD_INTENT', `Anchor "${attrs.id}" intent "${attrs.intent}" not in {fix|change|question|block}`));
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}
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anchors.push({
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id: attrs.id,
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target: attrs.target,
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line: attrs.line ? Number.parseInt(attrs.line, 10) : null,
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snippet: attrs.snippet || null,
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intent: attrs.intent || null,
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raw: line,
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position: { line: i + 1, col: 0 },
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});
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}
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if (errors.length > 0) return { valid: false, errors, warnings, parsed: anchors };
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return { valid: true, errors: [], warnings, parsed: anchors };
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}
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/**
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* Insert anchor comments into markdown above target lines.
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* Each anchor inserted on its own line with blank line separation.
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*
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* @param {string} md - source markdown
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* @param {Array<{id, target, line, snippet?, intent?}>} anchors - anchors to insert (sorted by line ASC)
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* @returns {string} markdown with anchors injected
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*/
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export function addAnchors(md, anchors) {
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if (typeof md !== 'string') return md;
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if (!Array.isArray(anchors) || anchors.length === 0) return md;
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const lines = md.split(/\r?\n/);
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// Sort by line desc so insertions don't shift later line numbers
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const sorted = [...anchors].sort((a, b) => (b.line || 0) - (a.line || 0));
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for (const a of sorted) {
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if (!a.line || a.line < 1 || a.line > lines.length + 1) continue;
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const attrs = [`id="${a.id}"`, `target="${a.target}"`, `line="${a.line}"`];
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if (a.snippet) attrs.push(`snippet="${a.snippet.slice(0, 80)}"`);
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if (a.intent) attrs.push(`intent="${a.intent}"`);
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const anchorLine = `<!-- voyage:anchor ${attrs.join(' ')} -->`;
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// Insert above target line: anchorLine + blank line, then target stays
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lines.splice(a.line - 1, 0, anchorLine, '');
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}
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return lines.join('\n');
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}
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/**
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* Strip all voyage:anchor comments from markdown, restoring the original.
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* Matches the format produced by addAnchors() — anchor line + following blank.
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*
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* @param {string} md
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* @returns {string} markdown with anchors removed
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*/
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export function stripAnchors(md) {
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if (typeof md !== 'string') return md;
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const lines = md.split(/\r?\n/);
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const out = [];
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for (let i = 0; i < lines.length; i++) {
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if (ANCHOR_LINE_RE.test(lines[i])) {
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// Skip anchor line; if next line is blank (separator inserted by addAnchors), skip it too
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if (i + 1 < lines.length && lines[i + 1].trim() === '') i++;
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continue;
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}
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out.push(lines[i]);
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}
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return out.join('\n');
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}
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/**
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* Validate anchor placement against voyage's structural constraints.
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* Returns errors for placement violations; does not mutate input.
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*
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* @param {string} md
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* @param {Anchor[]} anchors
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* @returns {Result}
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*/
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export function validateAnchorPlacement(md, anchors) {
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if (typeof md !== 'string') {
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return fail(issue('ANCHOR_INPUT', 'Input must be a string'));
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}
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const lines = md.split(/\r?\n/);
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const errors = [];
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// Build fenced-block ranges
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const fenced = []; // [{startLine, endLine}]
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let openLine = null;
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for (let i = 0; i < lines.length; i++) {
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if (FENCED_OPEN_RE.test(lines[i])) {
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if (openLine === null) {
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openLine = i;
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} else {
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fenced.push({ startLine: openLine, endLine: i });
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openLine = null;
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}
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}
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}
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for (let i = 0; i < lines.length; i++) {
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const line = lines[i];
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if (!ANCHOR_LINE_RE.test(line)) continue;
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// Inside fenced block?
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for (const f of fenced) {
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if (i > f.startLine && i < f.endLine) {
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errors.push(issue('ANCHOR_IN_FENCED_BLOCK', `Anchor at line ${i + 1} is inside fenced code block (lines ${f.startLine + 1}-${f.endLine + 1}); move it above or below the fence`));
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break;
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}
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}
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// List item context: either the anchor line itself starts with a list-marker,
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// OR the anchor line is indented (whitespace-prefixed) AND the previous
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// non-empty line is a list item. v4.2 disipline: anchors must start at col 0.
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if (LIST_ITEM_RE.test(line)) {
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errors.push(issue('ANCHOR_IN_LIST_ITEM', `Anchor at line ${i + 1} is inside a list-item (Prettier #18066 issue — move above the list)`));
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} else if (/^\s+</.test(line)) {
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// Anchor line is indented — likely nested inside a list or block-quote
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// Walk backwards to find the previous non-empty line
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let j = i - 1;
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while (j >= 0 && lines[j].trim() === '') j--;
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if (j >= 0 && (LIST_ITEM_RE.test(lines[j]) || /^\s+(?:[-*+]|\d+[.)])\s/.test(lines[j]))) {
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errors.push(issue('ANCHOR_IN_LIST_ITEM', `Anchor at line ${i + 1} is indented after a list-item — move to col 0 above the list`));
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}
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}
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// Forbidden line-start collision check: the anchor itself starts with `<!--`
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// so it cannot collide with these patterns directly. But if the operator
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// accidentally pasted an anchor on top of a structural line, that's caught
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// by the line-being-anchor check above, so explicit collision-detection
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// here is for defense-in-depth on adjacent text.
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// (No additional check needed — anchors have a fixed prefix.)
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}
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if (errors.length > 0) return { valid: false, errors, warnings: [], parsed: null };
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return ok(null);
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}
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