md048.js

// @ts-check

"use strict";

const { addErrorDetailIf, fencedCodeBlockStyleFor } = require("../helpers");

module.exports = {
  "names": [ "MD048", "code-fence-style" ],
  "description": "Code fence style",
  "tags": [ "code" ],
  "function": function MD048(params, onError) {
    const style = String(params.config.style || "consistent");
    let expectedStyle = style;
    const fenceTokens = params.tokens.filter((token) => token.type === "fence");
    for (const fenceToken of fenceTokens) {
      const { lineNumber, markup } = fenceToken;
      if (expectedStyle === "consistent") {
        expectedStyle = fencedCodeBlockStyleFor(markup);
      }
      addErrorDetailIf(
        onError,
        lineNumber,
        expectedStyle,
        fencedCodeBlockStyleFor(markup)
      );
    }
  }
};