diff --git a/index.js b/index.js
index a4fc24b..b53d31f 100644
--- a/index.js
+++ b/index.js
@@ -4,14 +4,63 @@
  * Cached method.
  */
 
-var splice = Array.prototype.splice;
 var has = Object.prototype.hasOwnProperty;
 
 /*
  * Hide process use from browserify.
  */
+
 var proc = typeof global !== 'undefined' && global.process;
 
+/*
+ * Blacklist of SHAs which are also valid words.
+ *
+ * GitHub allows abbreviating SHAs up to 7 characters.
+ * These are ignored in text because they might just be
+ * ment as normal words.  If you’d like these to link to
+ * their SHAs, just use more than 7 characters.
+ *
+ * Generated by:
+ *
+ *     egrep -i "^[a-f0-9]{7,}$" /usr/share/dict/words
+ */
+
+var BLACKLIST = [
+    'deedeed',
+    'fabaceae'
+];
+
+/**
+ * Check if a value is a SHA.
+ *
+ * @param {string} sha
+ * @return {boolean}
+ */
+function isSHA(sha) {
+    return BLACKLIST.indexOf(sha.toLowerCase()) === -1;
+}
+
+/**
+ * Abbreviate a SHA.
+ *
+ * @param {string} sha
+ * @return {string}
+ */
+function abbr(sha) {
+    return sha.slice(0, 7);
+}
+
+/*
+ * Map of overwrites for at-mentions.
+ * GitHub does some fancy stuff with `@mention`, by linking
+ * it to their blog-post introducing the feature.
+ * To my knowledge, there are no other magical usernames.
+ */
+
+var OVERWRITES = {};
+
+OVERWRITES.mentions = OVERWRITES.mention = 'blog/821';
+
 /**
  * Return a URL to GitHub, relative to an optional
  * `repo` object, or `user` and `project`.
@@ -41,48 +90,33 @@ function gh(repo, project) {
  * Username may only contain alphanumeric characters or
  * single hyphens, and cannot begin or end with a hyphen.
  *
- * `PERSON` is either a user or a team, but also matches a team:
- * https://github.com/blog/1121-introducing-team-mentions
+ * `PERSON` is either a user or an organization, but also
+ * matches a team:
+ *
+ *   https://github.com/blog/1121-introducing-team-mentions
  */
 
 var NAME = '(?:[a-z0-9]{1,2}|[a-z0-9][a-z0-9-]{1,37}[a-z0-9])';
 var USER = '(' + NAME + ')';
 var PERSON = '(' + NAME + '(?:\\/' + NAME + ')?)';
-var SHA = '([a-f0-9]{7,40})';
+var HASH = '([a-f0-9]{7,40})';
 var NUMBER = '([0-9]+)';
 var PROJECT = '((?:[a-z0-9-]|\\.git[a-z0-9-]|\\.(?!git))+)';
-var ISSUE = '(?:GH-|#)' + NUMBER;
 var REPO = USER + '\\/' + PROJECT;
 
-var EXPRESSION_SHA = new RegExp(
-    '^' + SHA + '\\b', 'gi'
-);
-
-var EXPRESSION_USER_SHA = new RegExp(
-    '^' + USER + '@' + SHA + '\\b', 'gi'
-);
-
-var EXPRESSION_REPO_SHA = new RegExp(
-    '^' + REPO + '@' + SHA + '\\b', 'gi'
-);
-
-var EXPRESSION_ISSUE = new RegExp(
-    '^' + ISSUE + '\\b', 'gi'
-);
-
-var EXPRESSION_USER_ISSUE = new RegExp(
-    '^' + USER + '#' + NUMBER + '\\b', 'gi'
-);
+var SHA = new RegExp('^' + HASH + '\\b', 'i');
+var USER_SHA = new RegExp('^' + USER + '@' + HASH + '\\b', 'i');
+var REPO_SHA = new RegExp('^' + REPO + '@' + HASH + '\\b', 'i');
+var ISSUE = new RegExp('^(?:GH-|#)' + NUMBER + '\\b', 'i');
+var USER_ISSUE = new RegExp('^' + USER + '#' + NUMBER + '\\b', 'i');
+var REPO_ISSUE = new RegExp('^' + REPO + '#' + NUMBER + '\\b', 'i');
+var MENTION = new RegExp('^@' + PERSON + '\\b(?!-)', 'i');
 
-var EXPRESSION_REPO_ISSUE = new RegExp(
-    '^' + REPO + '#' + NUMBER + '\\b', 'gi'
-);
-
-var EXPRESSION_MENTION = new RegExp(
-    '^@' + PERSON + '\\b(?!-)', 'gi'
-);
+/*
+ * Match a repo from a git / github URL.
+ */
 
-var EXPRESSIONS_REPO = new RegExp(
+var REPOSITORY = new RegExp(
     '(?:^|/(?:repos/)?)' + REPO + '(?=\\.git|[\\/#@]|$)', 'i'
 );
 
@@ -91,238 +125,50 @@ var EXPRESSIONS_REPO = new RegExp(
  * references.
  */
 
-var EXPRESSIONS_NON_REFERENCE_LIKE = /[^/.@#_a-zA-Z0-9-]/;
+var NON_GITHUB = /^[\s\S]+?(?:[^/.@#_a-zA-Z0-9-](?=[@#_a-zA-Z0-9-])|(?=$))/;
 
 /*
  * Expressions to use.
  */
 
 var expressions = {
-    'sha': EXPRESSION_SHA,
-    'userSHA': EXPRESSION_USER_SHA,
-    'repoSHA': EXPRESSION_REPO_SHA,
-    'issue': EXPRESSION_ISSUE,
-    'userIssue': EXPRESSION_USER_ISSUE,
-    'repoIssue': EXPRESSION_REPO_ISSUE,
-    'mention': EXPRESSION_MENTION
+    'ghRepoSHA': REPO_SHA,
+    'ghUserSHA': USER_SHA,
+    'ghSha': SHA,
+    'ghRepoIssue': REPO_ISSUE,
+    'ghUserIssue': USER_ISSUE,
+    'ghIssue': ISSUE,
+    'ghMention': MENTION
 };
 
-var order = [
-    'repoSHA',
-    'userSHA',
-    'sha',
-    'repoIssue',
-    'userIssue',
-    'issue',
-    'mention'
-];
-
 /*
- * Blacklist of SHAs which are also valid words.
- *
- * GitHub allows abbreviating SHAs up to 7 characters.
- *
- * Generated by:
- *
- *     egrep -i "^[a-f0-9]{7,}$" /usr/share/dict/words
+ * Order in which to use expressions.
  */
 
-var BLACKLIST = [
-    'deedeed',
-    'fabaceae'
+var order = [
+    'ghRepoSHA',
+    'ghUserSHA',
+    'ghSha',
+    'ghRepoIssue',
+    'ghUserIssue',
+    'ghIssue',
+    'ghMention'
 ];
 
-/**
- * Check if a value is a SHA.
- *
- * @param {string} sha
- * @return {boolean}
- */
-function isSHA(sha) {
-    return BLACKLIST.indexOf(sha.toLowerCase()) === -1;
-}
-
-/**
- * Abbreviate a SHA.
- *
- * @param {string} sha
- * @return {string}
- */
-function abbr(sha) {
-    return sha.slice(0, 7);
-}
-
-/**
- * Check if a node is a text node.
- *
- * @param {Node} node
- * @return {boolean}
- */
-function isText(node) {
-    return node && node.type === 'text';
-}
-
-/**
- * Render a link node.
- *
- * @param {Object} position
- * @param {string} href
- * @param {Array.<Node>} children
- * @return {Node}
- */
-function link(position, href, children) {
-    return {
-        'type': 'link',
-        'href': href,
-        'title': null,
-        'children': children,
-        'position': position
-    };
-}
-
-/**
- * Render a text node.
- *
- * @param {Object} position
- * @param {string} value
- * @return {Node}
- */
-function text(position, value) {
-    return {
-        'type': 'text',
-        'value': value,
-        'position': position
-    };
-}
-
-/**
- * Find references in a text node, and return a list
- * of replacement nodes.
- *
- * @param {Node} parent
- * @param {Object} repo
- * @return {Array.<Node>}
- */
-function augment(parent, repo) {
-    var value = parent.value;
-    var valueLength = value.length;
-    var nodes = [];
-    var length = order.length;
-    var index = -1;
-    var offset = -1;
-    var node;
-    var name;
-    var match;
-    var subposition;
-    var start = 0;
-    var end = 0;
-    var position = parent.position ? parent.position.start : {};
-    var line = position.line || 1;
-    var column = position.column || 1;
-
-    /**
-     * Get the current position.
-     *
-     * @return {Object}
-     */
-    function now() {
-        return {
-            'line': line,
-            'column': column
-        };
-    }
-
-    /**
-     * Location getter.
-     *
-     * @return {function(): Object}
-     */
-    function location() {
-        var before = now();
-
-        /**
-         * Return a `position`.
-         *
-         * @return {Object}
-         */
-        return function () {
-            return {
-                'start': before,
-                'end': now()
-            };
-        };
-    }
-
-    position = location();
-
-    while (++offset < valueLength) {
-        index = -1;
-
-        if (
-            offset === 0 ||
-            EXPRESSIONS_NON_REFERENCE_LIKE.test(value.charAt(offset - 1))
-        ) {
-            while (++index < length) {
-                name = order[index];
-
-                match = expressions[name].exec(value.slice(offset));
-
-                expressions[name].lastIndex = 0;
-
-                if (match) {
-                    subposition = location();
-
-                    end = offset;
-
-                    offset += match[0].length;
-
-                    node = augment[name].apply(
-                        null, [subposition(), repo].concat(match)
-                    );
-
-                    if (node) {
-                        if (end !== start) {
-                            nodes.push(text(
-                                position(), value.slice(start, end)
-                            ));
-
-                            position = location();
-                        }
-
-                        start = offset;
-                        nodes.push(node);
-                    }
-                }
-            }
-        }
-
-        if (value.charAt(index) === '\n') {
-            line++;
-            column = 0;
-        }
-
-        column++;
-    }
-
-    if (start < valueLength) {
-        nodes.push(text(position(), value.slice(start, offset)));
-    }
-
-    return nodes;
-}
-
 /**
  * Render a SHA relative to a repo.
  *
- * @param {Object} position
- * @param {Object} repo
+ * @property {boolean} notInLink
+ * @this {Parser}
+ * @param {Function} eat
  * @param {string} $0 - Whole content.
  * @param {Object} $1 - Username.
  * @param {Object} $2 - Project.
  * @param {Object} $3 - SHA.
  * @return {Node?}
  */
-augment.repoSHA = function (position, repo, $0, $1, $2, $3) {
+function ghRepoSHA(eat, $0, $1, $2, $3) {
+    var now = eat.now();
     var href;
     var value;
 
@@ -330,186 +176,183 @@ augment.repoSHA = function (position, repo, $0, $1, $2, $3) {
         href = gh($1, $2) + 'commit/' + $3;
         value = $1 + '/' + $2 + '@' + abbr($3);
 
-        return link(position, href, [text(position, value)]);
+        return eat($0)(this.renderLink(true, href, value, null, now, eat));
     }
-};
+}
+
+ghRepoSHA.notInLink = true;
 
 /**
  * Render a SHA relative to a user.
  *
- * @param {Object} position
- * @param {Object} repo
+ * @property {boolean} notInLink
+ * @this {Parser}
+ * @param {Function} eat
  * @param {string} $0 - Whole content.
  * @param {Object} $1 - Username.
  * @param {Object} $2 - SHA.
  * @return {Node?}
  */
-augment.userSHA = function (position, repo, $0, $1, $2) {
+function ghUserSHA(eat, $0, $1, $2) {
+    var now = eat.now();
     var href;
     var value;
 
     if (isSHA($2)) {
-        href = gh($1, repo.project) + 'commit/' + $2;
+        href = gh($1, this.github.project) + 'commit/' + $2;
         value = $1 + '@' + abbr($2);
 
-        return link(position, href, [text(position, value)]);
+        return eat($0)(this.renderLink(true, href, value, null, now, eat));
     }
-};
+}
+
+ghUserSHA.notInLink = true;
 
 /**
  * Render a SHA.
  *
- * @param {Object} position
- * @param {Object} repo
+ * @property {boolean} notInLink
+ * @this {Parser}
+ * @param {Function} eat
  * @param {string} $0 - Whole content.
  * @param {Object} $1 - SHA.
  * @return {Node?}
  */
-augment.sha = function (position, repo, $0, $1) {
+function ghSha(eat, $0, $1) {
+    var now = eat.now();
     var href;
 
     if (isSHA($1)) {
-        href = gh(repo) + 'commit/' + $1;
+        href = gh(this.github) + 'commit/' + $1;
 
-        return link(position, href, [text(position, abbr($0))]);
+        return eat($0)(this.renderLink(true, href, abbr($0), null, now, eat));
     }
-};
+}
+
+ghSha.notInLink = true;
 
 /**
  * Render an issue relative to a repo.
  *
- * @param {Object} position
- * @param {Object} repo
+ * @property {boolean} notInLink
+ * @this {Parser}
+ * @param {Function} eat
  * @param {string} $0 - Whole content.
  * @param {Object} $1 - Username.
  * @param {Object} $2 - Project.
  * @param {Object} $3 - Issue number.
  * @return {Node}
  */
-augment.repoIssue = function (position, repo, $0, $1, $2, $3) {
+function ghRepoIssue(eat, $0, $1, $2, $3) {
+    var now = eat.now();
     var href = gh($1, $2) + 'issues/' + $3;
 
-    return link(position, href, [text(position, $0)]);
-};
+    return eat($0)(this.renderLink(true, href, $0, null, now, eat));
+}
+
+ghRepoIssue.notInLink = true;
 
 /**
  * Render an issue relative to a user.
  *
- * @param {Object} position
- * @param {Object} repo
+ * @property {boolean} notInLink
+ * @this {Parser}
+ * @param {Function} eat
  * @param {string} $0 - Whole content.
  * @param {Object} $1 - Username.
  * @param {Object} $2 - Issue number.
  * @return {Node}
  */
-augment.userIssue = function (position, repo, $0, $1, $2) {
-    var href = gh($1, repo.project) + 'issues/' + $2;
+function ghUserIssue(eat, $0, $1, $2) {
+    var now = eat.now();
+    var href = gh($1, this.github.project) + 'issues/' + $2;
 
-    return link(position, href, [text(position, $0)]);
-};
+    return eat($0)(this.renderLink(true, href, $0, null, now, eat));
+}
+
+ghUserIssue.notInLink = true;
 
 /**
  * Render an issue.
  *
- * @param {Object} position
- * @param {Object} repo
+ * @property {boolean} notInLink
+ * @this {Parser}
+ * @param {Function} eat
  * @param {string} $0 - Whole content.
  * @param {Object} $1 - Issue number.
  * @return {Node}
  */
-augment.issue = function (position, repo, $0, $1) {
-    var href = gh(repo) + 'issues/' + $1;
-
-    return link(position, href, [text(position, $0)]);
-};
+function ghIssue(eat, $0, $1) {
+    var now = eat.now();
+    var href = gh(this.github) + 'issues/' + $1;
 
-var OVERWRITES = {};
+    return eat($0)(this.renderLink(true, href, $0, null, now, eat));
+}
 
-OVERWRITES.mentions = OVERWRITES.mention = 'blog/821';
+ghIssue.notInLink = true;
 
 /**
  * Render a mention.
  *
- * @param {Object} position
- * @param {Object} repo
+ * @param {Function} eat
  * @param {string} $0 - Whole content.
  * @param {Object} $1 - Username.
  * @return {Node}
  */
-augment.mention = function (position, repo, $0, $1) {
+function ghMention(eat, $0, $1) {
+    var now = eat.now();
     var href = gh() + (has.call(OVERWRITES, $1) ? OVERWRITES[$1] : $1);
 
-    return link(position, href, [text(position, $0)]);
-};
+    return eat($0)(this.renderLink(true, href, $0, null, now, eat));
+}
+
+ghMention.notInLink = true;
 
 /**
- * Construct a transformer
+ * Factory to parse plain-text, and look for github
+ * entities.
  *
- * @param {Object} repo
- * @return {function(node)}
+ * @param {Object} repo - User/project object.
+ * @return {Function} - Tokenizer.
  */
-function transformerFactory(repo) {
+function inlineTextFactory(repo) {
     /**
-     * Adds an example section based on a valid example
-     * JavaScript document to a `Usage` section.
+     * Factory to parse plain-text, and look for github
+     * entities.
      *
-     * @param {Node} node
+     * @param {Function} eat
+     * @param {string} $0 - Content.
+     * @return {Array.<Node>}
      */
-    return function (node) {
-        /**
-         * Replace a text node with results from `augment`.
-         *
-         * @param {Node} child
-         * @param {number} position
-         * @param {Array.<Node>} children
-         */
-        function replace(child, position, children) {
-            splice.apply(children, [position, 1].concat(
-                augment(child, repo)
-            ));
-        }
+    function inlineText(eat, $0) {
+        var self = this;
+        var now = eat.now();
 
-        var visit;
-        var visitAll;
-
-        /**
-         * Visit `node`.  Returns zero or more text blocks.
-         *
-         * @param {Node} child
-         */
-        visit = function (child, position, children) {
-            if (isText(child)) {
-                replace(child, position, children);
-            } else if ('children' in child && child.type !== 'link') {
-                visitAll(child.children);
-            }
-        };
+        self.github = repo;
 
-        /**
-         * Visit all `children`.  Returns a single nested
-         * array.
-         *
-         * @param {Array.<Node>} children
-         */
-        visitAll = function (children) {
-            children.map(visit);
-        };
+        return eat($0)(self.augmentGitHub($0, now));
+    }
 
-        visit(node);
-    };
+    return inlineText;
 }
 
 /**
  * Attacher.
  *
- * @param {MDAST} _
- * @param {Object?} options
- * @return {function(node)}
+ * @param {MDAST} mdast
+ * @param {Object?} [options]
  */
-function attacher(_, options) {
+function attacher(mdast, options) {
     var repo = (options || {}).repository;
+    var proto = mdast.Parser.prototype;
+    var scope = proto.inlineTokenizers;
+    var current = scope.inlineText;
     var pack;
 
+    /*
+     * Get the repo from `package.json`.
+     */
+
     if (!repo) {
         try {
             pack = require(require('path').resolve(
@@ -522,18 +365,62 @@ function attacher(_, options) {
         repo = pack.repository ? pack.repository.url || pack.repository : '';
     }
 
-    repo = EXPRESSIONS_REPO.exec(repo);
+    /*
+     * Parse the URL.
+     * See the tests for all possible URL kinds.
+     */
+
+    repo = REPOSITORY.exec(repo);
 
-    EXPRESSIONS_REPO.lastIndex = 0;
+    REPOSITORY.lastIndex = 0;
 
     if (!repo) {
         throw new Error('Missing `repository` field in `options`');
     }
 
-    return transformerFactory({
+    repo = {
         'user': repo[1],
         'project': repo[2]
-    });
+    };
+
+    /*
+     * Add a tokenizer to the `Parser`.
+     */
+
+    proto.augmentGitHub = proto.tokenizeFactory('gh');
+
+    /*
+     * Copy tokenizers, expressions, and methods.
+     */
+
+    proto.ghMethods = order.concat();
+
+    proto.ghTokenizers = {
+        'ghSha': ghSha,
+        'ghUserSHA': ghUserSHA,
+        'ghRepoSHA': ghRepoSHA,
+        'ghRepoIssue': ghRepoIssue,
+        'ghUserIssue': ghUserIssue,
+        'ghIssue': ghIssue,
+        'ghMention': ghMention
+    };
+
+    proto.expressions.gfm.ghSha = expressions.ghSha;
+    proto.expressions.gfm.ghUserSHA = expressions.ghUserSHA;
+    proto.expressions.gfm.ghRepoSHA = expressions.ghRepoSHA;
+    proto.expressions.gfm.ghIssue = expressions.ghIssue;
+    proto.expressions.gfm.ghUserIssue = expressions.ghUserIssue;
+    proto.expressions.gfm.ghRepoIssue = expressions.ghRepoIssue;
+    proto.expressions.gfm.ghMention = expressions.ghMention;
+
+    /*
+     * Overwrite `inlineText`.
+     */
+
+    proto.ghMethods.push('ghText');
+    proto.ghTokenizers.ghText = current;
+    proto.expressions.gfm.ghText = NON_GITHUB;
+    scope.inlineText = inlineTextFactory(repo);
 }
 
 /*
diff --git a/mdast-github.js b/mdast-github.js
index 34b76b8..fdd43bb 100644
--- a/mdast-github.js
+++ b/mdast-github.js
@@ -6,14 +6,63 @@
  * Cached method.
  */
 
-var splice = Array.prototype.splice;
 var has = Object.prototype.hasOwnProperty;
 
 /*
  * Hide process use from browserify.
  */
+
 var proc = typeof global !== 'undefined' && global.process;
 
+/*
+ * Blacklist of SHAs which are also valid words.
+ *
+ * GitHub allows abbreviating SHAs up to 7 characters.
+ * These are ignored in text because they might just be
+ * ment as normal words.  If you’d like these to link to
+ * their SHAs, just use more than 7 characters.
+ *
+ * Generated by:
+ *
+ *     egrep -i "^[a-f0-9]{7,}$" /usr/share/dict/words
+ */
+
+var BLACKLIST = [
+    'deedeed',
+    'fabaceae'
+];
+
+/**
+ * Check if a value is a SHA.
+ *
+ * @param {string} sha
+ * @return {boolean}
+ */
+function isSHA(sha) {
+    return BLACKLIST.indexOf(sha.toLowerCase()) === -1;
+}
+
+/**
+ * Abbreviate a SHA.
+ *
+ * @param {string} sha
+ * @return {string}
+ */
+function abbr(sha) {
+    return sha.slice(0, 7);
+}
+
+/*
+ * Map of overwrites for at-mentions.
+ * GitHub does some fancy stuff with `@mention`, by linking
+ * it to their blog-post introducing the feature.
+ * To my knowledge, there are no other magical usernames.
+ */
+
+var OVERWRITES = {};
+
+OVERWRITES.mentions = OVERWRITES.mention = 'blog/821';
+
 /**
  * Return a URL to GitHub, relative to an optional
  * `repo` object, or `user` and `project`.
@@ -43,48 +92,33 @@ function gh(repo, project) {
  * Username may only contain alphanumeric characters or
  * single hyphens, and cannot begin or end with a hyphen.
  *
- * `PERSON` is either a user or a team, but also matches a team:
- * https://github.com/blog/1121-introducing-team-mentions
+ * `PERSON` is either a user or an organization, but also
+ * matches a team:
+ *
+ *   https://github.com/blog/1121-introducing-team-mentions
  */
 
 var NAME = '(?:[a-z0-9]{1,2}|[a-z0-9][a-z0-9-]{1,37}[a-z0-9])';
 var USER = '(' + NAME + ')';
 var PERSON = '(' + NAME + '(?:\\/' + NAME + ')?)';
-var SHA = '([a-f0-9]{7,40})';
+var HASH = '([a-f0-9]{7,40})';
 var NUMBER = '([0-9]+)';
 var PROJECT = '((?:[a-z0-9-]|\\.git[a-z0-9-]|\\.(?!git))+)';
-var ISSUE = '(?:GH-|#)' + NUMBER;
 var REPO = USER + '\\/' + PROJECT;
 
-var EXPRESSION_SHA = new RegExp(
-    '^' + SHA + '\\b', 'gi'
-);
-
-var EXPRESSION_USER_SHA = new RegExp(
-    '^' + USER + '@' + SHA + '\\b', 'gi'
-);
-
-var EXPRESSION_REPO_SHA = new RegExp(
-    '^' + REPO + '@' + SHA + '\\b', 'gi'
-);
-
-var EXPRESSION_ISSUE = new RegExp(
-    '^' + ISSUE + '\\b', 'gi'
-);
-
-var EXPRESSION_USER_ISSUE = new RegExp(
-    '^' + USER + '#' + NUMBER + '\\b', 'gi'
-);
+var SHA = new RegExp('^' + HASH + '\\b', 'i');
+var USER_SHA = new RegExp('^' + USER + '@' + HASH + '\\b', 'i');
+var REPO_SHA = new RegExp('^' + REPO + '@' + HASH + '\\b', 'i');
+var ISSUE = new RegExp('^(?:GH-|#)' + NUMBER + '\\b', 'i');
+var USER_ISSUE = new RegExp('^' + USER + '#' + NUMBER + '\\b', 'i');
+var REPO_ISSUE = new RegExp('^' + REPO + '#' + NUMBER + '\\b', 'i');
+var MENTION = new RegExp('^@' + PERSON + '\\b(?!-)', 'i');
 
-var EXPRESSION_REPO_ISSUE = new RegExp(
-    '^' + REPO + '#' + NUMBER + '\\b', 'gi'
-);
-
-var EXPRESSION_MENTION = new RegExp(
-    '^@' + PERSON + '\\b(?!-)', 'gi'
-);
+/*
+ * Match a repo from a git / github URL.
+ */
 
-var EXPRESSIONS_REPO = new RegExp(
+var REPOSITORY = new RegExp(
     '(?:^|/(?:repos/)?)' + REPO + '(?=\\.git|[\\/#@]|$)', 'i'
 );
 
@@ -93,238 +127,50 @@ var EXPRESSIONS_REPO = new RegExp(
  * references.
  */
 
-var EXPRESSIONS_NON_REFERENCE_LIKE = /[^/.@#_a-zA-Z0-9-]/;
+var NON_GITHUB = /^[\s\S]+?(?:[^/.@#_a-zA-Z0-9-](?=[@#_a-zA-Z0-9-])|(?=$))/;
 
 /*
  * Expressions to use.
  */
 
 var expressions = {
-    'sha': EXPRESSION_SHA,
-    'userSHA': EXPRESSION_USER_SHA,
-    'repoSHA': EXPRESSION_REPO_SHA,
-    'issue': EXPRESSION_ISSUE,
-    'userIssue': EXPRESSION_USER_ISSUE,
-    'repoIssue': EXPRESSION_REPO_ISSUE,
-    'mention': EXPRESSION_MENTION
+    'ghRepoSHA': REPO_SHA,
+    'ghUserSHA': USER_SHA,
+    'ghSha': SHA,
+    'ghRepoIssue': REPO_ISSUE,
+    'ghUserIssue': USER_ISSUE,
+    'ghIssue': ISSUE,
+    'ghMention': MENTION
 };
 
-var order = [
-    'repoSHA',
-    'userSHA',
-    'sha',
-    'repoIssue',
-    'userIssue',
-    'issue',
-    'mention'
-];
-
 /*
- * Blacklist of SHAs which are also valid words.
- *
- * GitHub allows abbreviating SHAs up to 7 characters.
- *
- * Generated by:
- *
- *     egrep -i "^[a-f0-9]{7,}$" /usr/share/dict/words
+ * Order in which to use expressions.
  */
 
-var BLACKLIST = [
-    'deedeed',
-    'fabaceae'
+var order = [
+    'ghRepoSHA',
+    'ghUserSHA',
+    'ghSha',
+    'ghRepoIssue',
+    'ghUserIssue',
+    'ghIssue',
+    'ghMention'
 ];
 
-/**
- * Check if a value is a SHA.
- *
- * @param {string} sha
- * @return {boolean}
- */
-function isSHA(sha) {
-    return BLACKLIST.indexOf(sha.toLowerCase()) === -1;
-}
-
-/**
- * Abbreviate a SHA.
- *
- * @param {string} sha
- * @return {string}
- */
-function abbr(sha) {
-    return sha.slice(0, 7);
-}
-
-/**
- * Check if a node is a text node.
- *
- * @param {Node} node
- * @return {boolean}
- */
-function isText(node) {
-    return node && node.type === 'text';
-}
-
-/**
- * Render a link node.
- *
- * @param {Object} position
- * @param {string} href
- * @param {Array.<Node>} children
- * @return {Node}
- */
-function link(position, href, children) {
-    return {
-        'type': 'link',
-        'href': href,
-        'title': null,
-        'children': children,
-        'position': position
-    };
-}
-
-/**
- * Render a text node.
- *
- * @param {Object} position
- * @param {string} value
- * @return {Node}
- */
-function text(position, value) {
-    return {
-        'type': 'text',
-        'value': value,
-        'position': position
-    };
-}
-
-/**
- * Find references in a text node, and return a list
- * of replacement nodes.
- *
- * @param {Node} parent
- * @param {Object} repo
- * @return {Array.<Node>}
- */
-function augment(parent, repo) {
-    var value = parent.value;
-    var valueLength = value.length;
-    var nodes = [];
-    var length = order.length;
-    var index = -1;
-    var offset = -1;
-    var node;
-    var name;
-    var match;
-    var subposition;
-    var start = 0;
-    var end = 0;
-    var position = parent.position ? parent.position.start : {};
-    var line = position.line || 1;
-    var column = position.column || 1;
-
-    /**
-     * Get the current position.
-     *
-     * @return {Object}
-     */
-    function now() {
-        return {
-            'line': line,
-            'column': column
-        };
-    }
-
-    /**
-     * Location getter.
-     *
-     * @return {function(): Object}
-     */
-    function location() {
-        var before = now();
-
-        /**
-         * Return a `position`.
-         *
-         * @return {Object}
-         */
-        return function () {
-            return {
-                'start': before,
-                'end': now()
-            };
-        };
-    }
-
-    position = location();
-
-    while (++offset < valueLength) {
-        index = -1;
-
-        if (
-            offset === 0 ||
-            EXPRESSIONS_NON_REFERENCE_LIKE.test(value.charAt(offset - 1))
-        ) {
-            while (++index < length) {
-                name = order[index];
-
-                match = expressions[name].exec(value.slice(offset));
-
-                expressions[name].lastIndex = 0;
-
-                if (match) {
-                    subposition = location();
-
-                    end = offset;
-
-                    offset += match[0].length;
-
-                    node = augment[name].apply(
-                        null, [subposition(), repo].concat(match)
-                    );
-
-                    if (node) {
-                        if (end !== start) {
-                            nodes.push(text(
-                                position(), value.slice(start, end)
-                            ));
-
-                            position = location();
-                        }
-
-                        start = offset;
-                        nodes.push(node);
-                    }
-                }
-            }
-        }
-
-        if (value.charAt(index) === '\n') {
-            line++;
-            column = 0;
-        }
-
-        column++;
-    }
-
-    if (start < valueLength) {
-        nodes.push(text(position(), value.slice(start, offset)));
-    }
-
-    return nodes;
-}
-
 /**
  * Render a SHA relative to a repo.
  *
- * @param {Object} position
- * @param {Object} repo
+ * @property {boolean} notInLink
+ * @this {Parser}
+ * @param {Function} eat
  * @param {string} $0 - Whole content.
  * @param {Object} $1 - Username.
  * @param {Object} $2 - Project.
  * @param {Object} $3 - SHA.
  * @return {Node?}
  */
-augment.repoSHA = function (position, repo, $0, $1, $2, $3) {
+function ghRepoSHA(eat, $0, $1, $2, $3) {
+    var now = eat.now();
     var href;
     var value;
 
@@ -332,186 +178,183 @@ augment.repoSHA = function (position, repo, $0, $1, $2, $3) {
         href = gh($1, $2) + 'commit/' + $3;
         value = $1 + '/' + $2 + '@' + abbr($3);
 
-        return link(position, href, [text(position, value)]);
+        return eat($0)(this.renderLink(true, href, value, null, now, eat));
     }
-};
+}
+
+ghRepoSHA.notInLink = true;
 
 /**
  * Render a SHA relative to a user.
  *
- * @param {Object} position
- * @param {Object} repo
+ * @property {boolean} notInLink
+ * @this {Parser}
+ * @param {Function} eat
  * @param {string} $0 - Whole content.
  * @param {Object} $1 - Username.
  * @param {Object} $2 - SHA.
  * @return {Node?}
  */
-augment.userSHA = function (position, repo, $0, $1, $2) {
+function ghUserSHA(eat, $0, $1, $2) {
+    var now = eat.now();
     var href;
     var value;
 
     if (isSHA($2)) {
-        href = gh($1, repo.project) + 'commit/' + $2;
+        href = gh($1, this.github.project) + 'commit/' + $2;
         value = $1 + '@' + abbr($2);
 
-        return link(position, href, [text(position, value)]);
+        return eat($0)(this.renderLink(true, href, value, null, now, eat));
     }
-};
+}
+
+ghUserSHA.notInLink = true;
 
 /**
  * Render a SHA.
  *
- * @param {Object} position
- * @param {Object} repo
+ * @property {boolean} notInLink
+ * @this {Parser}
+ * @param {Function} eat
  * @param {string} $0 - Whole content.
  * @param {Object} $1 - SHA.
  * @return {Node?}
  */
-augment.sha = function (position, repo, $0, $1) {
+function ghSha(eat, $0, $1) {
+    var now = eat.now();
     var href;
 
     if (isSHA($1)) {
-        href = gh(repo) + 'commit/' + $1;
+        href = gh(this.github) + 'commit/' + $1;
 
-        return link(position, href, [text(position, abbr($0))]);
+        return eat($0)(this.renderLink(true, href, abbr($0), null, now, eat));
     }
-};
+}
+
+ghSha.notInLink = true;
 
 /**
  * Render an issue relative to a repo.
  *
- * @param {Object} position
- * @param {Object} repo
+ * @property {boolean} notInLink
+ * @this {Parser}
+ * @param {Function} eat
  * @param {string} $0 - Whole content.
  * @param {Object} $1 - Username.
  * @param {Object} $2 - Project.
  * @param {Object} $3 - Issue number.
  * @return {Node}
  */
-augment.repoIssue = function (position, repo, $0, $1, $2, $3) {
+function ghRepoIssue(eat, $0, $1, $2, $3) {
+    var now = eat.now();
     var href = gh($1, $2) + 'issues/' + $3;
 
-    return link(position, href, [text(position, $0)]);
-};
+    return eat($0)(this.renderLink(true, href, $0, null, now, eat));
+}
+
+ghRepoIssue.notInLink = true;
 
 /**
  * Render an issue relative to a user.
  *
- * @param {Object} position
- * @param {Object} repo
+ * @property {boolean} notInLink
+ * @this {Parser}
+ * @param {Function} eat
  * @param {string} $0 - Whole content.
  * @param {Object} $1 - Username.
  * @param {Object} $2 - Issue number.
  * @return {Node}
  */
-augment.userIssue = function (position, repo, $0, $1, $2) {
-    var href = gh($1, repo.project) + 'issues/' + $2;
+function ghUserIssue(eat, $0, $1, $2) {
+    var now = eat.now();
+    var href = gh($1, this.github.project) + 'issues/' + $2;
 
-    return link(position, href, [text(position, $0)]);
-};
+    return eat($0)(this.renderLink(true, href, $0, null, now, eat));
+}
+
+ghUserIssue.notInLink = true;
 
 /**
  * Render an issue.
  *
- * @param {Object} position
- * @param {Object} repo
+ * @property {boolean} notInLink
+ * @this {Parser}
+ * @param {Function} eat
  * @param {string} $0 - Whole content.
  * @param {Object} $1 - Issue number.
  * @return {Node}
  */
-augment.issue = function (position, repo, $0, $1) {
-    var href = gh(repo) + 'issues/' + $1;
-
-    return link(position, href, [text(position, $0)]);
-};
+function ghIssue(eat, $0, $1) {
+    var now = eat.now();
+    var href = gh(this.github) + 'issues/' + $1;
 
-var OVERWRITES = {};
+    return eat($0)(this.renderLink(true, href, $0, null, now, eat));
+}
 
-OVERWRITES.mentions = OVERWRITES.mention = 'blog/821';
+ghIssue.notInLink = true;
 
 /**
  * Render a mention.
  *
- * @param {Object} position
- * @param {Object} repo
+ * @param {Function} eat
  * @param {string} $0 - Whole content.
  * @param {Object} $1 - Username.
  * @return {Node}
  */
-augment.mention = function (position, repo, $0, $1) {
+function ghMention(eat, $0, $1) {
+    var now = eat.now();
     var href = gh() + (has.call(OVERWRITES, $1) ? OVERWRITES[$1] : $1);
 
-    return link(position, href, [text(position, $0)]);
-};
+    return eat($0)(this.renderLink(true, href, $0, null, now, eat));
+}
+
+ghMention.notInLink = true;
 
 /**
- * Construct a transformer
+ * Factory to parse plain-text, and look for github
+ * entities.
  *
- * @param {Object} repo
- * @return {function(node)}
+ * @param {Object} repo - User/project object.
+ * @return {Function} - Tokenizer.
  */
-function transformerFactory(repo) {
+function inlineTextFactory(repo) {
     /**
-     * Adds an example section based on a valid example
-     * JavaScript document to a `Usage` section.
+     * Factory to parse plain-text, and look for github
+     * entities.
      *
-     * @param {Node} node
+     * @param {Function} eat
+     * @param {string} $0 - Content.
+     * @return {Array.<Node>}
      */
-    return function (node) {
-        /**
-         * Replace a text node with results from `augment`.
-         *
-         * @param {Node} child
-         * @param {number} position
-         * @param {Array.<Node>} children
-         */
-        function replace(child, position, children) {
-            splice.apply(children, [position, 1].concat(
-                augment(child, repo)
-            ));
-        }
+    function inlineText(eat, $0) {
+        var self = this;
+        var now = eat.now();
 
-        var visit;
-        var visitAll;
-
-        /**
-         * Visit `node`.  Returns zero or more text blocks.
-         *
-         * @param {Node} child
-         */
-        visit = function (child, position, children) {
-            if (isText(child)) {
-                replace(child, position, children);
-            } else if ('children' in child && child.type !== 'link') {
-                visitAll(child.children);
-            }
-        };
+        self.github = repo;
 
-        /**
-         * Visit all `children`.  Returns a single nested
-         * array.
-         *
-         * @param {Array.<Node>} children
-         */
-        visitAll = function (children) {
-            children.map(visit);
-        };
+        return eat($0)(self.augmentGitHub($0, now));
+    }
 
-        visit(node);
-    };
+    return inlineText;
 }
 
 /**
  * Attacher.
  *
- * @param {MDAST} _
- * @param {Object?} options
- * @return {function(node)}
+ * @param {MDAST} mdast
+ * @param {Object?} [options]
  */
-function attacher(_, options) {
+function attacher(mdast, options) {
     var repo = (options || {}).repository;
+    var proto = mdast.Parser.prototype;
+    var scope = proto.inlineTokenizers;
+    var current = scope.inlineText;
     var pack;
 
+    /*
+     * Get the repo from `package.json`.
+     */
+
     if (!repo) {
         try {
             pack = require(require('path').resolve(
@@ -524,18 +367,62 @@ function attacher(_, options) {
         repo = pack.repository ? pack.repository.url || pack.repository : '';
     }
 
-    repo = EXPRESSIONS_REPO.exec(repo);
+    /*
+     * Parse the URL.
+     * See the tests for all possible URL kinds.
+     */
+
+    repo = REPOSITORY.exec(repo);
 
-    EXPRESSIONS_REPO.lastIndex = 0;
+    REPOSITORY.lastIndex = 0;
 
     if (!repo) {
         throw new Error('Missing `repository` field in `options`');
     }
 
-    return transformerFactory({
+    repo = {
         'user': repo[1],
         'project': repo[2]
-    });
+    };
+
+    /*
+     * Add a tokenizer to the `Parser`.
+     */
+
+    proto.augmentGitHub = proto.tokenizeFactory('gh');
+
+    /*
+     * Copy tokenizers, expressions, and methods.
+     */
+
+    proto.ghMethods = order.concat();
+
+    proto.ghTokenizers = {
+        'ghSha': ghSha,
+        'ghUserSHA': ghUserSHA,
+        'ghRepoSHA': ghRepoSHA,
+        'ghRepoIssue': ghRepoIssue,
+        'ghUserIssue': ghUserIssue,
+        'ghIssue': ghIssue,
+        'ghMention': ghMention
+    };
+
+    proto.expressions.gfm.ghSha = expressions.ghSha;
+    proto.expressions.gfm.ghUserSHA = expressions.ghUserSHA;
+    proto.expressions.gfm.ghRepoSHA = expressions.ghRepoSHA;
+    proto.expressions.gfm.ghIssue = expressions.ghIssue;
+    proto.expressions.gfm.ghUserIssue = expressions.ghUserIssue;
+    proto.expressions.gfm.ghRepoIssue = expressions.ghRepoIssue;
+    proto.expressions.gfm.ghMention = expressions.ghMention;
+
+    /*
+     * Overwrite `inlineText`.
+     */
+
+    proto.ghMethods.push('ghText');
+    proto.ghTokenizers.ghText = current;
+    proto.expressions.gfm.ghText = NON_GITHUB;
+    scope.inlineText = inlineTextFactory(repo);
 }
 
 /*
diff --git a/mdast-github.min.js b/mdast-github.min.js
index 4cb9743..4eb3b78 100644
--- a/mdast-github.min.js
+++ b/mdast-github.min.js
@@ -1 +1 @@
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