Make link/image/reference helpers overridable

lib/index.js

@@ -338,7 +338,7 @@ function MarkdownIt(presetName, options) {
    * Link components parser functions, useful to write plugins. See details
    * [here](https://github.com/markdown-it/markdown-it/blob/master/lib/helpers).
    **/
-  this.helpers = helpers;
+  this.helpers = utils.assign({}, helpers);
 
 
   this.options = {};

lib/rules_block/reference.js

@@ -1,8 +1,6 @@
 'use strict';
 
 
-var parseLinkDestination = require('../helpers/parse_link_destination');
-var parseLinkTitle       = require('../helpers/parse_link_title');
 var normalizeReference   = require('../common/utils').normalizeReference;
 var isSpace              = require('../common/utils').isSpace;
 
@@ -106,7 +104,7 @@ module.exports = function reference(state, startLine, _endLine, silent) {
 
   // [label]:   destination   'title'
   //            ^^^^^^^^^^^ parse this
-  res = parseLinkDestination(str, pos, max);
+  res = state.md.helpers.parseLinkDestination(str, pos, max);
   if (!res.ok) { return false; }
 
   href = state.md.normalizeLink(res.str);
@@ -135,7 +133,7 @@ module.exports = function reference(state, startLine, _endLine, silent) {
 
   // [label]:   destination   'title'
   //                          ^^^^^^^ parse this
-  res = parseLinkTitle(str, pos, max);
+  res = state.md.helpers.parseLinkTitle(str, pos, max);
   if (pos < max && start !== pos && res.ok) {
     title = res.str;
     pos = res.pos;

lib/rules_inline/image.js

@@ -2,9 +2,6 @@
 
 'use strict';
 
-var parseLinkLabel       = require('../helpers/parse_link_label');
-var parseLinkDestination = require('../helpers/parse_link_destination');
-var parseLinkTitle       = require('../helpers/parse_link_title');
 var normalizeReference   = require('../common/utils').normalizeReference;
 var isSpace              = require('../common/utils').isSpace;
 
@@ -31,7 +28,7 @@ module.exports = function image(state, silent) {
   if (state.src.charCodeAt(state.pos + 1) !== 0x5B/* [ */) { return false; }
 
   labelStart = state.pos + 2;
-  labelEnd = parseLinkLabel(state, state.pos + 1, false);
+  labelEnd = state.md.helpers.parseLinkLabel(state, state.pos + 1, false);
 
   // parser failed to find ']', so it's not a valid link
   if (labelEnd < 0) { return false; }
@@ -54,7 +51,7 @@ module.exports = function image(state, silent) {
     // [link](  <href>  "title"  )
     //          ^^^^^^ parsing link destination
     start = pos;
-    res = parseLinkDestination(state.src, pos, state.posMax);
+    res = state.md.helpers.parseLinkDestination(state.src, pos, state.posMax);
     if (res.ok) {
       href = state.md.normalizeLink(res.str);
       if (state.md.validateLink(href)) {
@@ -74,7 +71,7 @@ module.exports = function image(state, silent) {
 
     // [link](  <href>  "title"  )
     //                  ^^^^^^^ parsing link title
-    res = parseLinkTitle(state.src, pos, state.posMax);
+    res = state.md.helpers.parseLinkTitle(state.src, pos, state.posMax);
     if (pos < max && start !== pos && res.ok) {
       title = res.str;
       pos = res.pos;
@@ -102,7 +99,7 @@ module.exports = function image(state, silent) {
 
     if (pos < max && state.src.charCodeAt(pos) === 0x5B/* [ */) {
       start = pos + 1;
-      pos = parseLinkLabel(state, pos);
+      pos = state.md.helpers.parseLinkLabel(state, pos);
       if (pos >= 0) {
         label = state.src.slice(start, pos++);
       } else {

lib/rules_inline/link.js

@@ -2,9 +2,6 @@
 
 'use strict';
 
-var parseLinkLabel       = require('../helpers/parse_link_label');
-var parseLinkDestination = require('../helpers/parse_link_destination');
-var parseLinkTitle       = require('../helpers/parse_link_title');
 var normalizeReference   = require('../common/utils').normalizeReference;
 var isSpace              = require('../common/utils').isSpace;
 
@@ -28,7 +25,7 @@ module.exports = function link(state, silent) {
   if (state.src.charCodeAt(state.pos) !== 0x5B/* [ */) { return false; }
 
   labelStart = state.pos + 1;
-  labelEnd = parseLinkLabel(state, state.pos, true);
+  labelEnd = state.md.helpers.parseLinkLabel(state, state.pos, true);
 
   // parser failed to find ']', so it's not a valid link
   if (labelEnd < 0) { return false; }
@@ -51,7 +48,7 @@ module.exports = function link(state, silent) {
     // [link](  <href>  "title"  )
     //          ^^^^^^ parsing link destination
     start = pos;
-    res = parseLinkDestination(state.src, pos, state.posMax);
+    res = state.md.helpers.parseLinkDestination(state.src, pos, state.posMax);
     if (res.ok) {
       href = state.md.normalizeLink(res.str);
       if (state.md.validateLink(href)) {
@@ -71,7 +68,7 @@ module.exports = function link(state, silent) {
 
     // [link](  <href>  "title"  )
     //                  ^^^^^^^ parsing link title
-    res = parseLinkTitle(state.src, pos, state.posMax);
+    res = state.md.helpers.parseLinkTitle(state.src, pos, state.posMax);
     if (pos < max && start !== pos && res.ok) {
       title = res.str;
       pos = res.pos;
@@ -99,7 +96,7 @@ module.exports = function link(state, silent) {
 
     if (pos < max && state.src.charCodeAt(pos) === 0x5B/* [ */) {
       start = pos + 1;
-      pos = parseLinkLabel(state, pos);
+      pos = state.md.helpers.parseLinkLabel(state, pos);
       if (pos >= 0) {
         label = state.src.slice(start, pos++);
       } else {