Handle invalid escaped quotes in tags more gracefully

Don't break the entire parsing of the template afterwards by treating escaped quotes which aren't already in quotes as not being quotes

Author: jasmith-hs

src/main/java/com/hubspot/jinjava/tree/parse/TokenScanner.java

@@ -68,17 +68,15 @@ private Token getNextToken() {
       }
 
       if (inBlock > 0) {
-        if (inQuote != 0) {
+        if (c == '\\') {
+          ++currPost;
+          continue;
+        } else if (inQuote != 0) {
           if (inQuote == c) {
             inQuote = 0;
-            continue;
-          } else if (c == '\\') {
-            ++currPost;
-            continue;
-          } else {
-            continue;
           }
-        } else if (inQuote == 0 && (c == '\'' || c == '"')) {
+          continue;
+        } else if (c == '\'' || c == '"') {
           inQuote = c;
           continue;
         }

src/test/java/com/hubspot/jinjava/tree/parse/TokenScannerTest.java

@@ -305,6 +305,23 @@ public void testLstripBlocks() {
     assertThat(tokens).isNotEmpty();
   }
 
+  @Test
+  public void itTreatsEscapedQuotesSameWhenNotInQuotes() {
+    List<Token> tokens = tokens("tag-with-all-escaped-quotes");
+    assertThat(tokens).hasSize(8);
+    assertThat(tokens.stream().map(Token::getType).collect(Collectors.toList()))
+      .containsExactly(
+        symbols.getNote(),
+        symbols.getFixed(),
+        symbols.getTag(),
+        symbols.getFixed(),
+        symbols.getTag(),
+        symbols.getFixed(),
+        symbols.getTag(),
+        symbols.getFixed()
+      );
+  }
+
   private List<Token> tokens(String fixture) {
     TokenScanner t = fixture(fixture);
     return Lists.newArrayList(t);

src/test/resources/parse/tokenizer/tag-with-all-escaped-quotes.jinja

@@ -0,0 +1,7 @@
+{# This print tag is invalid, but it should not cause the rest of the template to break #}
+{% print \"foo\" %}
+Start
+{% if true %}
+The dog says: "Woof!"
+{% endif %}
+End