Use OnigString API to allow caching of RegExp matches

package.json

@@ -22,7 +22,7 @@
     "event-kit": "^2.2.0",
     "fs-plus": "^3.0.0",
     "grim": "^2.0.1",
-    "oniguruma": "^6.1.0",
+    "oniguruma": "6.2.0-0",
     "season": "^6.0.0",
     "underscore-plus": "^1"
   },

spec/grammar-registry-spec.coffee

@@ -1,5 +1,5 @@
 path = require 'path'
-GrammarRegistry = require '../lib/grammar-registry'
+GrammarRegistry = require '../src/grammar-registry'
 
 describe "GrammarRegistry", ->
   registry = null

spec/grammar-spec.coffee

@@ -1,8 +1,8 @@
 path = require 'path'
 _ = require 'underscore-plus'
 fs = require 'fs-plus'
-GrammarRegistry = require '../lib/grammar-registry'
-Grammar = require '../lib/grammar'
+GrammarRegistry = require '../src/grammar-registry'
+Grammar = require '../src/grammar'
 
 describe "Grammar tokenization", ->
   [grammar, registry] = []

src/grammar.coffee

@@ -2,7 +2,7 @@ path = require 'path'
 
 _ = require 'underscore-plus'
 fs = require 'fs-plus'
-{OnigRegExp} = require 'oniguruma'
+{OnigRegExp, OnigString} = require 'oniguruma'
 {Emitter} = require 'event-kit'
 Grim = require 'grim'
 
@@ -108,6 +108,8 @@ class Grammar
     else
       line = inputLine
 
+    string = new OnigString(line + '\n')
+
     if ruleStack?
       ruleStack = ruleStack.slice()
       if compatibilityMode
@@ -137,7 +139,7 @@ class Grammar
         truncatedLine = true
         break
 
-      if match = _.last(ruleStack).rule.getNextTags(ruleStack, line, position, firstLine)
+      if match = _.last(ruleStack).rule.getNextTags(ruleStack, string, position, firstLine)
         {nextTags, tagsStart, tagsEnd} = match
 
         # Unmatched text before next tags

src/pattern.coffee

@@ -83,7 +83,7 @@ class Pattern
     beginCaptures = []
 
     for {start, end} in beginCaptureIndices
-      beginCaptures.push(line[start...end])
+      beginCaptures.push(line.substring(start, end))
 
     resolvedMatch = @match.replace AllDigitsRegex, (match) ->
       index = parseInt(match[1..])

src/rule.coffee

@@ -52,8 +52,7 @@ class Rule
       capture.start = Math.min(capture.start, lineLength)
     return
 
-  findNextMatch: (ruleStack, line, position, firstLine) ->
-    lineWithNewline = "#{line}\n"
+  findNextMatch: (ruleStack, lineWithNewline, position, firstLine) ->
     baseGrammar = ruleStack[0].rule.grammar
     results = []