import { Rule, RuleViolation } from './rule-interface';
/**
* MD037: Spaces inside emphasis markers
*
* This rule is triggered when emphasis markers (bold, italic) have spaces between
* the markers and the text. This is incorrect in most Markdown parsers.
* For example, ** bold ** should be **bold**.
*/
export const name = 'MD037';
export const description = 'Spaces inside emphasis markers';
/**
* Fix spaces inside emphasis markers by removing them
* @param lines Array of string lines to fix
* @returns Fixed lines array with proper emphasis marker spacing
*/
export function fix(lines: string[]): string[] {
return lines.map(line => {
let fixedLine = line;
// Fix spaces inside bold markers (**text**)
fixedLine = fixedLine.replace(/\*\*(\s*)([^*]*?)(\s*)\*\*/g, (match, leadingSpaces, content, trailingSpaces) => {
if (!content.trim()) return match; // Skip empty emphasis
return `**${content.trim()}**`;
});
// Fix spaces inside underscore bold markers (__text__)
fixedLine = fixedLine.replace(/__(\s*)([^_]*?)(\s*)__/g, (match, leadingSpaces, content, trailingSpaces) => {
if (!content.trim()) return match; // Skip empty emphasis
return `__${content.trim()}__`;
});
// Fix spaces inside italic markers (*text*) - simple approach
fixedLine = fixedLine.replace(/(?<!\*)\*(\s*)([^*]*?)(\s*)\*(?!\*)/g, (match, leadingSpaces, content, trailingSpaces) => {
if (!content.trim()) return match; // Skip empty emphasis
return `*${content.trim()}*`;
});
// Fix spaces inside underscore italic markers (_text_)
fixedLine = fixedLine.replace(/(?<!_)_(\s*)([^_]*?)(\s*)_(?!_)/g, (match, leadingSpaces, content, trailingSpaces) => {
if (!content.trim()) return match; // Skip empty emphasis
return `_${content.trim()}_`;
});
return fixedLine;
});
}
/**
* Validate lines for spaces inside emphasis markers
* @param lines Array of string lines to validate
* @returns Array of rule violations
*/
export function validate(lines: string[]): RuleViolation[] {
const violations: RuleViolation[] = [];
lines.forEach((line, index) => {
// Check for spaces inside bold markers (**text**)
const boldMatches = line.matchAll(/\*\*(\s*)([^*]*?)(\s*)\*\*/g);
for (const match of boldMatches) {
const leadingSpaces = match[1];
const content = match[2];
const trailingSpaces = match[3];
if (content.trim() && (leadingSpaces || trailingSpaces)) {
violations.push({
lineNumber: index + 1,
details: 'Spaces inside bold emphasis markers',
range: [match.index || 0, match[0].length]
});
}
}
// Check for spaces inside underscore bold markers (__text__)
const underscoreBoldMatches = line.matchAll(/__(\s*)([^_]*?)(\s*)__/g);
for (const match of underscoreBoldMatches) {
const leadingSpaces = match[1];
const content = match[2];
const trailingSpaces = match[3];
if (content.trim() && (leadingSpaces || trailingSpaces)) {
violations.push({
lineNumber: index + 1,
details: 'Spaces inside underscore bold emphasis markers',
range: [match.index || 0, match[0].length]
});
}
}
// Check for spaces inside italic markers (*text*) - simple pattern
const italicMatches = line.matchAll(/(?<!\*)\*(\s*)([^*]*?)(\s*)\*(?!\*)/g);
for (const match of italicMatches) {
const leadingSpaces = match[1];
const content = match[2];
const trailingSpaces = match[3];
if (content.trim() && (leadingSpaces || trailingSpaces)) {
violations.push({
lineNumber: index + 1,
details: 'Spaces inside italic emphasis markers',
range: [match.index || 0, match[0].length]
});
}
}
// Check for spaces inside underscore italic markers (_text_)
const underscoreItalicMatches = line.matchAll(/(?<!_)_(\s*)([^_]*?)(\s*)_(?!_)/g);
for (const match of underscoreItalicMatches) {
const leadingSpaces = match[1];
const content = match[2];
const trailingSpaces = match[3];
if (content.trim() && (leadingSpaces || trailingSpaces)) {
violations.push({
lineNumber: index + 1,
details: 'Spaces inside underscore italic emphasis markers',
range: [match.index || 0, match[0].length]
});
}
}
});
return violations;
}
/**
* Rule implementation for MD037
*/
export const rule: Rule = {
name,
description,
validate,
fix
};
export default rule;
