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function replaceElement(source, element, value) {
const firstTag = `<${element}>`;
const firstSpace = element.indexOf(" ");
if (firstSpace !== -1)
element = element.substring(0, firstSpace);
const startTag = `<${element}.*?>`;
const endTag = `</${element}.*?>`;
const span = getTagSpan(source, [startTag, endTag], firstTag);
return source.substring(0, span[0]) +
value +
source.substring(span[1]);
}
function getTagSpan(s, tags=["\\(", "\\)"], customFirstTag=undefined)
{
customFirstTag = new RegExp(customFirstTag || tags[0]);
let i = s.search(customFirstTag);
if (i === -1)
return s;
tags = [
new RegExp("^" + tags[0]),
new RegExp("^" + tags[1])
];
const start = i;
i++;
let depth = 1;
while((depth !== 0) && (i !== s.length))
{
let maybeStartTag = s.substring(i);
let maybeEndTag = s.substring(i);
depth += +tags[0].test(maybeStartTag) + -tags[1].test(maybeEndTag);
i++;
}
i += (s.substring(i - 1).match(tags[1]) || [""])[0] .length - 1;
return [start, i];
}
const countOccurrences = (s, regex) => (s.match(regex) || []).length;
module.exports = {
span: getTagSpan,
replaceElement: replaceElement,
count: countOccurrences
}
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