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* LSP-aware parser module
* Extends the base parser with position information for VS Code integration
*/
import type { Code, Root, RootContent, Yaml } from 'mdast';
import remarkFrontmatter from 'remark-frontmatter';
import remarkGfm from 'remark-gfm';
import remarkParse from 'remark-parse';
import { unified } from 'unified';
import { parseDocument } from 'yaml';
import {
createParseError,
createPosition,
createRange,
failure,
success,
type ParseError,
type Position,
type Range,
type Result,
} from '../types/index.js';
import { findSectionByTag } from '../types/sections.js';
/**
* Code block with position information
*/
export interface LocatedCodeBlock {
readonly type: string; // e.g., 'experience', 'education', 'skills'
readonly lang: string; // e.g., 'resume:experience'
readonly content: string;
readonly range: Range;
readonly contentRange: Range; // Range of the YAML content inside the block
}
/**
* Frontmatter field with position information
*/
export interface LocatedFrontmatterField {
readonly key: string;
readonly value: string | undefined;
readonly range: Range;
readonly keyRange: Range;
readonly valueRange: Range | undefined;
}
/**
* Frontmatter with position information
*/
export interface LocatedFrontmatter {
readonly range: Range;
readonly fields: readonly LocatedFrontmatterField[];
readonly raw: string;
}
/**
* Section with position information
*/
export interface LocatedSection {
readonly id: string;
readonly title: string;
readonly range: Range;
readonly titleRange: Range;
readonly codeBlocks: readonly LocatedCodeBlock[];
}
/**
* Parsed document with full position information for LSP
*/
export interface ParsedDocumentWithPositions {
readonly frontmatter: LocatedFrontmatter | null;
readonly sections: readonly LocatedSection[];
readonly codeBlocks: readonly LocatedCodeBlock[];
readonly rawContent: string;
}
/**
* Create markdown processor
*/
// eslint-disable-next-line @typescript-eslint/explicit-function-return-type
function createProcessor() {
return unified()
.use(remarkParse)
.use(remarkGfm)
.use(remarkFrontmatter, ['yaml']);
}
/**
* Convert mdast position to our Position type (0-based)
*/
function toPosition(
point: { line: number; column: number } | undefined,
): Position {
if (!point) {
return createPosition(0, 0);
}
// mdast uses 1-based lines and columns, convert to 0-based
return createPosition(point.line - 1, point.column - 1);
}
/**
* Convert mdast position to our Range type
*/
function toRange(
position:
| {
start: { line: number; column: number };
end: { line: number; column: number };
}
| undefined,
): Range {
if (!position) {
return createRange(createPosition(0, 0), createPosition(0, 0));
}
return createRange(toPosition(position.start), toPosition(position.end));
}
/**
* Extract text from mdast node
*/
function extractText(node: RootContent): string {
if ('value' in node && typeof node.value === 'string') {
return node.value;
}
if ('children' in node && Array.isArray(node.children)) {
return (node.children as RootContent[]).map(extractText).join('');
}
return '';
}
/**
* Parse frontmatter YAML with position information
*/
function parseFrontmatterWithPositions(
yamlNode: Yaml,
errors: ParseError[],
): LocatedFrontmatter | null {
const yamlContent = yamlNode.value;
const nodeRange = toRange(yamlNode.position);
// The YAML content starts after the opening ---
// We need to calculate the offset for field positions
const yamlStartLine = nodeRange.start.line + 1; // Skip the --- line
const fields: LocatedFrontmatterField[] = [];
try {
const doc = parseDocument(yamlContent, { keepSourceTokens: true });
// Check for YAML parse errors
if (doc.errors.length > 0) {
for (const error of doc.errors) {
const line = error.linePos?.[0]?.line ?? 1;
const col = error.linePos?.[0]?.col ?? 1;
errors.push(
createParseError(
`Invalid YAML frontmatter: ${error.message}`,
yamlStartLine + line - 1,
col,
'frontmatter',
),
);
}
return null;
}
if (doc.contents && 'items' in doc.contents) {
for (const item of doc.contents.items) {
// Check if item is a Pair (has key and value properties)
Eif (
'key' in item &&
'value' in item &&
item.key &&
item.value !== undefined
) {
const keyNode = item.key;
const valueNode = item.value;
const keyStr = String(keyNode);
const valueStr = valueNode ? String(valueNode) : undefined;
// Calculate positions relative to the document
// yaml library uses 0-based offsets, we need to convert to line/column
const keyRange = calculateYamlNodeRange(
yamlContent,
keyNode,
yamlStartLine,
);
const valueRange = valueNode
? calculateYamlNodeRange(yamlContent, valueNode, yamlStartLine)
: undefined;
const fieldRange = createRange(
keyRange.start,
valueRange ? valueRange.end : keyRange.end,
);
fields.push({
key: keyStr,
value: valueStr,
range: fieldRange,
keyRange,
valueRange,
});
}
}
}
} catch (e) {
// Handle unexpected errors (defensive code - YAML library normally doesn't throw)
errors.push(
createParseError(
`Invalid YAML frontmatter: ${String(e)}`,
yamlStartLine,
1,
'frontmatter',
),
);
return null;
}
return {
range: nodeRange,
fields,
raw: yamlContent,
};
}
/**
* Calculate range for a YAML node within the document
*/
function calculateYamlNodeRange(
yamlContent: string,
node: unknown,
baseLineOffset: number,
): Range {
// Try to get range from node if available
const nodeWithRange = node as { range?: [number, number, number?] };
if (nodeWithRange.range) {
const [startOffset, endOffset] = nodeWithRange.range;
const startPos = offsetToPosition(yamlContent, startOffset, baseLineOffset);
const endPos = offsetToPosition(yamlContent, endOffset, baseLineOffset);
return createRange(startPos, endPos);
}
// Fallback: return a zero-width range at the base offset
return createRange(
createPosition(baseLineOffset, 0),
createPosition(baseLineOffset, 0),
);
}
/**
* Convert byte offset to Position
*/
function offsetToPosition(
content: string,
offset: number,
baseLineOffset: number,
): Position {
let line = 0;
let lastNewline = -1;
for (let i = 0; i < offset && i < content.length; i++) {
if (content[i] === '\n') {
line++;
lastNewline = i;
}
}
const character = offset - lastNewline - 1;
return createPosition(baseLineOffset + line, character);
}
/**
* Parse code block with position information
*/
function parseCodeBlock(codeNode: Code): LocatedCodeBlock | null {
const lang = codeNode.lang || '';
// Only process resume: code blocks
if (!lang.startsWith('resume:')) {
return null;
}
const type = lang.replace('resume:', '');
const range = toRange(codeNode.position);
// Content range is inside the code fence
// Start after the opening ``` line, end before the closing ```
const contentRange = createRange(
createPosition(range.start.line + 1, 0),
createPosition(range.end.line - 1, 0),
);
return {
type,
lang,
content: codeNode.value,
range,
contentRange,
};
}
/**
* Parse sections with position information
*/
function parseSectionsWithPositions(tree: Root): LocatedSection[] {
const sections: LocatedSection[] = [];
const contentNodes = tree.children.filter((node) => node.type !== 'yaml');
let currentTitle: string | null = null;
let currentTitleRange: Range | null = null;
let currentCodeBlocks: LocatedCodeBlock[] = [];
for (const node of contentNodes) {
if (node.type === 'heading' && node.depth === 1) {
// Save previous section
if (currentTitle !== null && currentTitleRange !== null) {
const sectionDef = findSectionByTag(currentTitle);
if (sectionDef) {
const endLine = node.position?.start.line
? node.position.start.line - 2
: currentTitleRange.end.line;
sections.push({
id: sectionDef.id,
title: currentTitle,
range: createRange(
currentTitleRange.start,
createPosition(endLine, 0),
),
titleRange: currentTitleRange,
codeBlocks: currentCodeBlocks,
});
}
}
// Start new section
currentTitle = node.children
.map((c) => extractText(c as RootContent))
.join('');
currentTitleRange = toRange(node.position);
currentCodeBlocks = [];
} else if (currentTitle !== null && node.type === 'code') {
const codeBlock = parseCodeBlock(node);
if (codeBlock) {
currentCodeBlocks.push(codeBlock);
}
}
}
// Don't forget last section
if (currentTitle !== null && currentTitleRange !== null) {
const sectionDef = findSectionByTag(currentTitle);
if (sectionDef) {
// Find the last line of content
const lastNode = contentNodes[contentNodes.length - 1];
const endLine =
lastNode?.position?.end.line ?? currentTitleRange.end.line;
sections.push({
id: sectionDef.id,
title: currentTitle,
range: createRange(
currentTitleRange.start,
createPosition(endLine - 1, 0),
),
titleRange: currentTitleRange,
codeBlocks: currentCodeBlocks,
});
}
}
return sections;
}
/**
* Parse markdown with full position information for LSP
*/
export function parseMarkdownWithPositions(
markdown: string,
): Result<ParsedDocumentWithPositions, ParseError[]> {
const errors: ParseError[] = [];
try {
const processor = createProcessor();
const tree = processor.parse(markdown);
// Find and parse frontmatter
const yamlNode = tree.children.find(
(node): node is Yaml => node.type === 'yaml',
);
const frontmatter = yamlNode
? parseFrontmatterWithPositions(yamlNode, errors)
: null;
if (errors.length > 0) {
return failure(errors);
}
// Collect all code blocks
const allCodeBlocks: LocatedCodeBlock[] = [];
for (const node of tree.children) {
if (node.type === 'code') {
const codeBlock = parseCodeBlock(node);
if (codeBlock) {
allCodeBlocks.push(codeBlock);
}
}
}
// Parse sections
const sections = parseSectionsWithPositions(tree);
return success({
frontmatter,
sections,
codeBlocks: allCodeBlocks,
rawContent: markdown,
});
} catch (e) {
// Handle unexpected errors (defensive code - remark parser normally doesn't throw)
errors.push(
createParseError(
`Failed to parse markdown: ${String(e)}`,
1,
1,
'markdown',
),
);
return failure(errors);
}
}
export default parseMarkdownWithPositions;
// Export internal functions for testing
export const __test__ = {
toPosition,
toRange,
extractText,
calculateYamlNodeRange,
offsetToPosition,
};
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