Added typographer draft

bin/remarkable.js

@@ -63,7 +63,8 @@ readFile(options.file, 'utf8', function (error, input) {
 
   md = new Remarkable({
     html: true,
-    xhtml: true
+    xhtml: true,
+    typographer: true
   });
 
   try {

lib/index.js

@@ -9,6 +9,7 @@ var assign = require('object-assign');
 var Renderer     = require('./renderer');
 var ParserBlock  = require('./parser_block');
 var ParserInline = require('./parser_inline');
+var Typographer  = require('./typographer');
 var defaults     = require('./defaults');
 
 // Main class
@@ -20,10 +21,11 @@ function Remarkable(options) {
   this.inline   = new ParserInline();
   this.block    = new ParserBlock();
   this.renderer = new Renderer();
+  this.typographer = new Typographer();
 
-  // a bunch of cross-references between parsers
-  // used for link reference definitions
+  // Cross-references to simplify code (a bit dirty, but easy).
   this.block.inline = this.inline;
+  this.inline.typographer = this.typographer;
 
   if (options) { this.set(options); }
 }

lib/parser_inline.js

@@ -103,6 +103,7 @@ ParserInline.prototype.tokenize = function (state) {
   return state.tokens;
 };
 
+
 // Parse input string.
 //
 ParserInline.prototype.parse = function (str, options, env) {
@@ -110,6 +111,10 @@ ParserInline.prototype.parse = function (str, options, env) {
 
   this.tokenize(state);
 
+  if (options.typographer && this.typographer) {
+    this.typographer.process(state);
+  }
+
   return state.tokens;
 };
 

lib/typographer.js

@@ -0,0 +1,86 @@
+// Class of typographic replacements rules
+//
+// - single quotes
+// - double quotes
+// - em-dashes
+// - link patterns
+// - email patterns
+//
+'use strict';
+
+// TODO:
+// - fractionals 1/2, 1/4, 3/4 -> ½, ¼, ¾
+// - miltiplication 2 x 4 -> 2 × 4
+
+var Ruler       = require('./ruler');
+
+
+var rules = [];
+
+
+rules.push(function single(t, state) {
+  var i, token, text, tokens = state.tokens,
+      copyright    = t.copyright,
+      trademark    = t.trademark,
+      registered   = t.registered,
+      plusminus    = t.plusminus;
+
+  for (i = state.tokens.length - 1; i >= 0; i--) {
+    if (tokens[i].type === 'text') {
+      token = tokens[i];
+      text = token.content;
+
+      if (copyright && text.indexOf('(') >= 0) {
+        text = text.replace(/\(c\)/gi, '©');
+      }
+      if (trademark && text.indexOf('(') >= 0) {
+        text = text.replace(/\(tm\)/gi, '™');
+      }
+      if (registered && text.indexOf('(') >= 0) {
+        text = text.replace(/\(r\)/gi, '®');
+      }
+      if (plusminus && text.indexOf('+/-') >= 0) {
+        text = text.replace(/\+\/\-/g, '±');
+      }
+
+      token.content = text;
+    }
+  }
+});
+
+
+function Typographer() {
+  this.singleQuotes = '‘’';
+  this.doubleQuotes = '“”'; // «» - russian, „“ - deutch
+  this.copyright    = true;
+  this.trademark    = true;
+  this.registered   = true;
+  this.plusminus    = true;
+
+  this.ruler = new Ruler(this.rulesUpdate.bind(this));
+
+  for (var i = 0; i < rules.length; i++) {
+    this.ruler.after(rules[i]);
+  }
+}
+
+
+Typographer.prototype.rulesUpdate = function () {
+  this._rules = this.ruler.getRules();
+};
+
+
+Typographer.prototype.process = function (state) {
+  var i, l, rules;
+
+  if (!state.options.typographer) { return; }
+
+  rules = this._rules;
+
+  for (i = 0, l = rules.length; i < l; i++) {
+    rules[i](this, state);
+  }
+};
+
+
+module.exports = Typographer;