--- /dev/null
+'use strict';
+
+var whitespace = require('is-whitespace-character');
+var normalize = require('../util/normalize');
+
+module.exports = footnoteDefinition;
+footnoteDefinition.notInList = true;
+footnoteDefinition.notInBlock = true;
+
+var C_BACKSLASH = '\\';
+var C_NEWLINE = '\n';
+var C_TAB = '\t';
+var C_SPACE = ' ';
+var C_BRACKET_OPEN = '[';
+var C_BRACKET_CLOSE = ']';
+var C_CARET = '^';
+var C_COLON = ':';
+
+var EXPRESSION_INITIAL_TAB = /^( {4}|\t)?/gm;
+
+function footnoteDefinition(eat, value, silent) {
+ var self = this;
+ var offsets = self.offset;
+ var index;
+ var length;
+ var subvalue;
+ var now;
+ var currentLine;
+ var content;
+ var queue;
+ var subqueue;
+ var character;
+ var identifier;
+ var add;
+ var exit;
+
+ if (!self.options.footnotes) {
+ return;
+ }
+
+ index = 0;
+ length = value.length;
+ subvalue = '';
+ now = eat.now();
+ currentLine = now.line;
+
+ while (index < length) {
+ character = value.charAt(index);
+
+ if (!whitespace(character)) {
+ break;
+ }
+
+ subvalue += character;
+ index++;
+ }
+
+ if (
+ value.charAt(index) !== C_BRACKET_OPEN ||
+ value.charAt(index + 1) !== C_CARET
+ ) {
+ return;
+ }
+
+ subvalue += C_BRACKET_OPEN + C_CARET;
+ index = subvalue.length;
+ queue = '';
+
+ while (index < length) {
+ character = value.charAt(index);
+
+ if (character === C_BRACKET_CLOSE) {
+ break;
+ } else if (character === C_BACKSLASH) {
+ queue += character;
+ index++;
+ character = value.charAt(index);
+ }
+
+ queue += character;
+ index++;
+ }
+
+ if (
+ !queue ||
+ value.charAt(index) !== C_BRACKET_CLOSE ||
+ value.charAt(index + 1) !== C_COLON
+ ) {
+ return;
+ }
+
+ if (silent) {
+ return true;
+ }
+
+ identifier = normalize(queue);
+ subvalue += queue + C_BRACKET_CLOSE + C_COLON;
+ index = subvalue.length;
+
+ while (index < length) {
+ character = value.charAt(index);
+
+ if (character !== C_TAB && character !== C_SPACE) {
+ break;
+ }
+
+ subvalue += character;
+ index++;
+ }
+
+ now.column += subvalue.length;
+ now.offset += subvalue.length;
+ queue = '';
+ content = '';
+ subqueue = '';
+
+ while (index < length) {
+ character = value.charAt(index);
+
+ if (character === C_NEWLINE) {
+ subqueue = character;
+ index++;
+
+ while (index < length) {
+ character = value.charAt(index);
+
+ if (character !== C_NEWLINE) {
+ break;
+ }
+
+ subqueue += character;
+ index++;
+ }
+
+ queue += subqueue;
+ subqueue = '';
+
+ while (index < length) {
+ character = value.charAt(index);
+
+ if (character !== C_SPACE) {
+ break;
+ }
+
+ subqueue += character;
+ index++;
+ }
+
+ if (subqueue.length === 0) {
+ break;
+ }
+
+ queue += subqueue;
+ }
+
+ if (queue) {
+ content += queue;
+ queue = '';
+ }
+
+ content += character;
+ index++;
+ }
+
+ subvalue += content;
+
+ content = content.replace(EXPRESSION_INITIAL_TAB, function (line) {
+ offsets[currentLine] = (offsets[currentLine] || 0) + line.length;
+ currentLine++;
+
+ return '';
+ });
+
+ add = eat(subvalue);
+
+ exit = self.enterBlock();
+ content = self.tokenizeBlock(content, now);
+ exit();
+
+ return add({
+ type: 'footnoteDefinition',
+ identifier: identifier,
+ children: content
+ });
+}