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diff --git a/build/toc.js b/build/toc.js
new file mode 100644
index 0000000..2c18887
--- /dev/null
+++ b/build/toc.js
@@ -0,0 +1,128 @@
+// Process @[toc](|Title)
+
+'use strict'
+
+module.exports = function (md) {
+ const TOC_REGEXP = /\[toc\](?:\((?:\s+)?([^\)]+)(?:\s+)?\)?)?(?:\s+?)?$/im
+ let gstate
+
+ function toc(state, silent) {
+ while (state.src.indexOf('\n') >= 0 && state.src.indexOf('\n') < state.src.indexOf('[toc]')) {
+ if (state.tokens.slice(-1)[0].type === 'softbreak') {
+ state.src = state.src.split('\n').slice(1).join('\n')
+ state.pos = 0
+ }
+ }
+ let token
+ let match = TOC_REGEXP.exec(state.src)
+ if (!match) {
+ return false
+ }
+ match = match.filter(function (m) {
+ return m
+ })
+ if (match.length < 1) {
+ return false
+ }
+ if (silent) {
+ // don't run any pairs in validation mode
+ return false
+ }
+
+ token = state.push('toc_open', 'toc', 1)
+ token.markup = '[toc]'
+
+ token = state.push('toc_body', '', 0)
+
+ token = state.push('toc_close', 'toc', -1)
+
+ let offset = 0
+ let newline = state.src.indexOf('\n')
+ if (newline !== -1) {
+ offset = state.pos + newline
+ } else {
+ offset = state.pos + state.posMax + 1
+ }
+ state.pos = offset
+
+ return true
+ }
+ const makeSafe = function (label) {
+ return label
+ .replace(/[^\w\s]/gi, '')
+ .split(' ')
+ .join('_')
+ }
+
+ md.renderer.rules.heading_open = function (tokens, index) {
+ const level = tokens[index].tag
+ const label = tokens[index + 1]
+ if (label.type === 'inline') {
+ const anchor = makeSafe(label.content) + '_' + label.map[0]
+ return `<${level}>`
+ } else {
+ return ''
+ }
+ }
+
+ md.renderer.rules.toc_open = function (_tokens, _index) {
+ return ''
+ }
+
+ md.renderer.rules.toc_close = function (_tokens, _index) {
+ return ''
+ }
+
+ md.renderer.rules.toc_body = function (_tokens, _index) {
+ // Wanted to avoid linear search through tokens here,
+ // but this seems the only reliable way to identify headings
+ const headings = []
+ const gtokens = gstate.tokens
+ const size = gtokens.length
+ for (let i = 0; i < size; i++) {
+ if (gtokens[i].type !== 'heading_close') {
+ continue
+ }
+ const token = gtokens[i]
+ const heading = gtokens[i - 1]
+ if (heading.type === 'inline') {
+ headings.push({
+ level: +token.tag.substr(1, 1),
+ anchor: makeSafe(heading.content) + '_' + heading.map[0],
+ content: heading.content
+ })
+ }
+ }
+
+ let indent = 0
+ const list = headings.map(function (heading) {
+ let res = []
+ if (heading.level > indent) {
+ const ldiff = heading.level - indent
+ for (let i = 0; i < ldiff; i++) {
+ res.push('
+
+