Method useStrictBehavior

static/katex/katex.mjs:323–350

* Check whether to apply strict (LaTeX-adhering) behavior for unusual * input (like `\\`). Unlike `nonstrict`, will not throw an error; * instead, "error" translates to a return value of `true`, while "ignore" * translates to a return value of `false`. May still print a warning: * "war

(errorCode, errorMsg, token)

  useStrictBehavior(errorCode, errorMsg, token) {
    let strict = this.strict;

    if (typeof strict === "function") {
      // Allow return value of strict function to be boolean or string
      // (or null/undefined, meaning no further processing).
      // But catch any exceptions thrown by function, treating them
      // like "error".
      try {
        strict = strict(errorCode, errorMsg, token);
      } catch (error) {
        strict = "error";
      }
    }

    if (!strict || strict === "ignore") {
      return false;
    } else if (strict === true || strict === "error") {
      return true;
    } else if (strict === "warn") {
      typeof console !== "undefined" && console.warn("LaTeX-incompatible input and strict mode is set to 'warn': " + `${errorMsg} [${errorCode}]`);
      return false;
    } else {
      // won't happen in type-safe code
      typeof console !== "undefined" && console.warn("LaTeX-incompatible input and strict mode is set to " + `unrecognized '${strict}': ${errorMsg} [${errorCode}]`);
      return false;
    }
  }

}