Refactor to remove regular expressions

...in favour of an algorithmic approach.

New features:

*   Add support for `silent` mode on tokenisers, which will
    detect whether a given value would match that tokeniser,
    but without eating any actual content.
*   Plugging into the parser is singificantly improved;
*   Searching for upcomming inline nodes is improved by allowing
    `locator`s to search for possible places where nodes start.

Fixes:

*   Better handling of mismatched parentheses in links;
*   Continued block-quotes in non-GFM-mode;
*   Block-quotes followed by lazy definitions in commonmark-mode;
*   Malformed HTML block elements are no longer supported;
*   Bug where GFM’s literal URL detection could detect e-mail addresses
    without an at-character;
*   Bug where `mailto:` literal URLs were not properly stripped
    of their protocol.

Todo:

*   A lot of places support escaped (a slash followed by another character),
    instead of allowing any character to be escaped, only certain characters
    should be supported (e.g., all ASCII-character for commonmark-mode, and
    several separate subsets on other flavours).

Closes GH-82.

.eslintignore

@@ -1,7 +1,6 @@
 build/
 components/
 coverage/
-lib/expressions.js
 build.js
 mdast.js
 mdast.min.js

.jscs.json

@@ -4,8 +4,6 @@
     "components/",
     "coverage/",
     "node_modules/",
-    "lib/expressions.js",
-    "script/build-expressions.js",
     "build.js",
     "mdast.js",
     "mdast.min.js"

component.json

@@ -32,9 +32,12 @@
   "scripts": [
     "index.js",
     "lib/defaults.js",
-    "lib/expressions.js",
     "lib/parse.js",
     "lib/stringify.js",
     "lib/utilities.js"
+  ],
+  "json": [
+    "lib/block-elements.json",
+    "lib/escape.json"
   ]
 }

index.js

@@ -18,6 +18,7 @@
 var unified = require('unified');
 var Parser = require('./lib/parse.js');
 var Compiler = require('./lib/stringify.js');
+var escape = require('./lib/escape.json');
 
 /*
  * Exports.
@@ -26,5 +27,8 @@ var Compiler = require('./lib/stringify.js');
 module.exports = unified({
     'name': 'mdast',
     'Parser': Parser,
-    'Compiler': Compiler
+    'Compiler': Compiler,
+    'data': {
+        'escape': escape
+    }
 });

lib/block-elements.json

@@ -0,0 +1,52 @@
+[
+    "article",
+    "header",
+    "aside",
+    "hgroup",
+    "blockquote",
+    "hr",
+    "iframe",
+    "body",
+    "li",
+    "map",
+    "button",
+    "object",
+    "canvas",
+    "ol",
+    "caption",
+    "output",
+    "col",
+    "p",
+    "colgroup",
+    "pre",
+    "dd",
+    "progress",
+    "div",
+    "section",
+    "dl",
+    "table",
+    "td",
+    "dt",
+    "tbody",
+    "embed",
+    "textarea",
+    "fieldset",
+    "tfoot",
+    "figcaption",
+    "th",
+    "figure",
+    "thead",
+    "footer",
+    "tr",
+    "form",
+    "ul",
+    "h1",
+    "h2",
+    "h3",
+    "h4",
+    "h5",
+    "h6",
+    "video",
+    "script",
+    "style"
+]

lib/escape.json

@@ -0,0 +1,75 @@
+{
+  "default": [
+    "\\",
+    "`",
+    "*",
+    "{",
+    "}",
+    "[",
+    "]",
+    "(",
+    ")",
+    "#",
+    "+",
+    "-",
+    ".",
+    "!",
+    "_",
+    ">"
+  ],
+  "gfm": [
+    "\\",
+    "`",
+    "*",
+    "{",
+    "}",
+    "[",
+    "]",
+    "(",
+    ")",
+    "#",
+    "+",
+    "-",
+    ".",
+    "!",
+    "_",
+    ">",
+    "~",
+    "|"
+  ],
+  "commonmark": [
+    "\\",
+    "`",
+    "*",
+    "{",
+    "}",
+    "[",
+    "]",
+    "(",
+    ")",
+    "#",
+    "+",
+    "-",
+    ".",
+    "!",
+    "_",
+    ">",
+    "~",
+    "|",
+    "\n",
+    "\"",
+    "$",
+    "%",
+    "&",
+    "'",
+    ",",
+    "/",
+    ":",
+    ";",
+    "<",
+    "=",
+    "?",
+    "@",
+    "^"
+  ]
+}

lib/inline-text-stop.json

@@ -0,0 +1,22 @@
+{
+  "default": [
+    "\\",
+    "<",
+    "!",
+    "[",
+    "_",
+    "*",
+    "`"
+  ],
+  "gfm": [
+    "~",
+    "http://",
+    "https://",
+    "mailto:"
+  ],
+  "commonmark": [],
+  "pedantic": [],
+  "breaks": [
+    "\n"
+  ]
+}