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1 files changed, 117 insertions, 0 deletions

diff --git a/node_modules/markdown-it/lib/rules_inline/strikethrough.js b/node_modules/markdown-it/lib/rules_inline/strikethrough.js
new file mode 100644
index 00000000..03472412
--- /dev/null
+++ b/node_modules/markdown-it/lib/rules_inline/strikethrough.js
@@ -0,0 +1,117 @@
+// ~~strike through~~
+//
+'use strict';
+
+
+// Insert each marker as a separate text token, and add it to delimiter list
+//
+module.exports.tokenize = function strikethrough(state, silent) {
+  var i, scanned, token, len, ch,
+      start = state.pos,
+      marker = state.src.charCodeAt(start);
+
+  if (silent) { return false; }
+
+  if (marker !== 0x7E/* ~ */) { return false; }
+
+  scanned = state.scanDelims(state.pos, true);
+  len = scanned.length;
+  ch = String.fromCharCode(marker);
+
+  if (len < 2) { return false; }
+
+  if (len % 2) {
+    token         = state.push('text', '', 0);
+    token.content = ch;
+    len--;
+  }
+
+  for (i = 0; i < len; i += 2) {
+    token         = state.push('text', '', 0);
+    token.content = ch + ch;
+
+    state.delimiters.push({
+      marker: marker,
+      jump:   i,
+      token:  state.tokens.length - 1,
+      level:  state.level,
+      end:    -1,
+      open:   scanned.can_open,
+      close:  scanned.can_close
+    });
+  }
+
+  state.pos += scanned.length;
+
+  return true;
+};
+
+
+// Walk through delimiter list and replace text tokens with tags
+//
+module.exports.postProcess = function strikethrough(state) {
+  var i, j,
+      startDelim,
+      endDelim,
+      token,
+      loneMarkers = [],
+      delimiters = state.delimiters,
+      max = state.delimiters.length;
+
+  for (i = 0; i < max; i++) {
+    startDelim = delimiters[i];
+
+    if (startDelim.marker !== 0x7E/* ~ */) {
+      continue;
+    }
+
+    if (startDelim.end === -1) {
+      continue;
+    }
+
+    endDelim = delimiters[startDelim.end];
+
+    token         = state.tokens[startDelim.token];
+    token.type    = 's_open';
+    token.tag     = 's';
+    token.nesting = 1;
+    token.markup  = '~~';
+    token.content = '';
+
+    token         = state.tokens[endDelim.token];
+    token.type    = 's_close';
+    token.tag     = 's';
+    token.nesting = -1;
+    token.markup  = '~~';
+    token.content = '';
+
+    if (state.tokens[endDelim.token - 1].type === 'text' &&
+        state.tokens[endDelim.token - 1].content === '~') {
+
+      loneMarkers.push(endDelim.token - 1);
+    }
+  }
+
+  // If a marker sequence has an odd number of characters, it's splitted
+  // like this: `~~~~~` -> `~` + `~~` + `~~`, leaving one marker at the
+  // start of the sequence.
+  //
+  // So, we have to move all those markers after subsequent s_close tags.
+  //
+  while (loneMarkers.length) {
+    i = loneMarkers.pop();
+    j = i + 1;
+
+    while (j < state.tokens.length && state.tokens[j].type === 's_close') {
+      j++;
+    }
+
+    j--;
+
+    if (i !== j) {
+      token = state.tokens[j];
+      state.tokens[j] = state.tokens[i];
+      state.tokens[i] = token;
+    }
+  }
+};