'use strict';

/**

* tokenAttrReplace(name, value)

*

* Replace all attributes with name `name` with one with the value `attrData`

**/

function attrReplace(token, name, value) {

let found;

let attrs = token.attrs;

if (attrs) {

// modify the existing attr is possible

for (let i = 0; i < attrs.length; i++) {

if (attrs[i][0] === name) {

if (!found) {

attrs[i][1] = value;

found = true;

} else {

// remove extra attrs with same name

attrs.splice(i, 1);

i--;

}

}

}

// add a new attribute with such name if none was found

if (!found) {

attrs.push([name, value]);

}

} else {

token.attrs = [ [name, value] ];

}

}

function addClass(token, value) {

let classAttr = attrGet(token, 'class');

if (classAttr.match(new RegExp(`\b${value}\b`))) return;

if (classAttr) {

classAttr += ' ' + value;

} else {

classAttr = value;

}

attrReplace(token, 'class', classAttr);

}

function attrGet(token, name) {

let idx = token.attrIndex(name);

if (idx == -1) return null;

return token.attrs[idx][1];

}

function attrDel(token, name) {

let idx = token.attrIndex(name);

if (idx == -1) return null;

token.attrs.splice(idx, 1);

}

exports.attrReplace = attrReplace;

exports.attrGet = attrGet;

exports.attrDel = attrDel;

exports.addClass = addClass;