Add/fix indentation checking in blockquotes

fix #111

lib/rules_block/blockquote.js

@@ -54,6 +54,8 @@ module.exports = function blockquote(state, startLine, endLine, silent) {
   //      - - -
   //     ```
   for (nextLine = startLine + 1; nextLine < endLine; nextLine++) {
+    if (state.tShift[nextLine] < oldIndent) { break; }
+
     pos = state.bMarks[nextLine] + state.tShift[nextLine];
     max = state.eMarks[nextLine];
 
@@ -99,7 +101,7 @@ module.exports = function blockquote(state, startLine, endLine, silent) {
     //
     // Any negative number will do the job here, but it's better for it
     // to be large enough to make any bugs obvious.
-    state.tShift[nextLine] = -1337;
+    state.tShift[nextLine] = -1;
   }
 
   oldParentType = state.parentType;

lib/rules_block/paragraph.js

@@ -15,6 +15,9 @@ module.exports = function paragraph(state, startLine/*, endLine*/) {
     // it's considered a lazy continuation regardless of what's there
     if (state.tShift[nextLine] - state.blkIndent > 3) { continue; }
 
+    // quirk for blockquotes, this line should already be checked by that rule
+    if (state.tShift[nextLine] < 0) { continue; }
+
     // Some tags can terminate paragraph without empty line.
     terminate = false;
     for (i = 0, l = terminatorRules.length; i < l; i++) {

lib/rules_block/reference.js

@@ -50,6 +50,9 @@ module.exports = function reference(state, startLine, _endLine, silent) {
     // it's considered a lazy continuation regardless of what's there
     if (state.tShift[nextLine] - state.blkIndent > 3) { continue; }
 
+    // quirk for blockquotes, this line should already be checked by that rule
+    if (state.tShift[nextLine] < 0) { continue; }
+
     // Some tags can terminate paragraph without empty line.
     terminate = false;
     for (i = 0, l = terminatorRules.length; i < l; i++) {

test/fixtures/markdown-it/commonmark_extras.txt

@@ -69,6 +69,23 @@ _(hai)_.
 <p><em>(hai)</em>.</p>
 .
 
+Those are two separate blockquotes:
+.
+ - > foo
+  > bar
+.
+<ul>
+<li>
+<blockquote>
+<p>foo</p>
+</blockquote>
+</li>
+</ul>
+<blockquote>
+<p>bar</p>
+</blockquote>
+.
+
 
 Coverage. Directive can terminate paragraph.
 .
@@ -199,3 +216,10 @@ test
 test
 ]</p>
 .
+.
+> [foo]: bar
+[foo]
+.
+<blockquote></blockquote>
+<p><a href="bar">foo</a></p>
+.