From e93b3733744e859e7dc4987d0b117be698246b6d Mon Sep 17 00:00:00 2001
From: "Matt A. Tobin" <email@mattatobin.com>
Date: Wed, 15 Jan 2020 22:07:59 -0500
Subject: Fix an issue with the html5 tokenizer and tree builder (java
 htmlparser)

---
 .../nu/validator/htmlparser/impl/Tokenizer.java    | 32 +++++++++++++++++++---
 .../nu/validator/htmlparser/impl/TreeBuilder.java  | 21 +++++---------
 2 files changed, 35 insertions(+), 18 deletions(-)

(limited to 'parser')

diff --git a/parser/html/java/htmlparser/src/nu/validator/htmlparser/impl/Tokenizer.java b/parser/html/java/htmlparser/src/nu/validator/htmlparser/impl/Tokenizer.java
index 75ba2e1e4..0f8e518ef 100644
--- a/parser/html/java/htmlparser/src/nu/validator/htmlparser/impl/Tokenizer.java
+++ b/parser/html/java/htmlparser/src/nu/validator/htmlparser/impl/Tokenizer.java
@@ -680,6 +680,22 @@ public class Tokenizer implements Locator {
      *
      * @param specialTokenizerState
      *            the tokenizer state to set
+     */
+    public void setState(int specialTokenizerState) {
+        this.stateSave = specialTokenizerState;
+        this.endTagExpectation = null;
+        this.endTagExpectationAsArray = null;
+    }
+
+    // [NOCPP[
+
+    /**
+     * Sets the tokenizer state and the associated element name. This should
+     * only ever used to put the tokenizer into one of the states that have
+     * a special end tag expectation. For use from the tokenizer test harness.
+     *
+     * @param specialTokenizerState
+     *            the tokenizer state to set
      * @param endTagExpectation
      *            the expected end tag for transitioning back to normal
      */
@@ -695,6 +711,8 @@ public class Tokenizer implements Locator {
         endTagExpectationToArray();
     }
 
+    // ]NOCPP]
+
     /**
      * Sets the tokenizer state and the associated element name. This should
      * only ever used to put the tokenizer into one of the states that have
@@ -3749,11 +3767,17 @@ public class Tokenizer implements Locator {
                         c = checkChar(buf, pos);
                         /*
                          * ASSERT! when entering this state, set index to 0 and
-                         * call clearStrBufBeforeUse() assert (contentModelElement !=
-                         * null); Let's implement the above without lookahead.
-                         * strBuf is the 'temporary buffer'.
+                         * call clearStrBufBeforeUse(); Let's implement the above
+                         * without lookahead. strBuf is the 'temporary buffer'.
                          */
-                        if (index < endTagExpectationAsArray.length) {
+                        if (endTagExpectationAsArray == null) {
+                            tokenHandler.characters(Tokenizer.LT_SOLIDUS,
+                                    0, 2);
+                            cstart = pos;
+                            reconsume = true;
+                            state = transition(state, returnState, reconsume, pos);
+                            continue stateloop;
+                        } else if (index < endTagExpectationAsArray.length) {
                             char e = endTagExpectationAsArray[index];
                             char folded = c;
                             if (c >= 'A' && c <= 'Z') {
diff --git a/parser/html/java/htmlparser/src/nu/validator/htmlparser/impl/TreeBuilder.java b/parser/html/java/htmlparser/src/nu/validator/htmlparser/impl/TreeBuilder.java
index c69a66ea3..947657eb1 100644
--- a/parser/html/java/htmlparser/src/nu/validator/htmlparser/impl/TreeBuilder.java
+++ b/parser/html/java/htmlparser/src/nu/validator/htmlparser/impl/TreeBuilder.java
@@ -640,8 +640,7 @@ public abstract class TreeBuilder<T> implements TokenHandler,
                 );
                 currentPtr++;
                 stack[currentPtr] = node;
-                tokenizer.setStateAndEndTagExpectation(Tokenizer.DATA,
-                        contextName);
+                tokenizer.setState(Tokenizer.DATA);
                 // The frameset-ok flag is set even though <frameset> never
                 // ends up being allowed as HTML frameset in the fragment case.
                 mode = FRAMESET_OK;
@@ -671,8 +670,7 @@ public abstract class TreeBuilder<T> implements TokenHandler,
                 );
                 currentPtr++;
                 stack[currentPtr] = node;
-                tokenizer.setStateAndEndTagExpectation(Tokenizer.DATA,
-                        contextName);
+                tokenizer.setState(Tokenizer.DATA);
                 // The frameset-ok flag is set even though <frameset> never
                 // ends up being allowed as HTML frameset in the fragment case.
                 mode = FRAMESET_OK;
@@ -691,23 +689,18 @@ public abstract class TreeBuilder<T> implements TokenHandler,
                 resetTheInsertionMode();
                 formPointer = getFormPointerForContext(contextNode);
                 if ("title" == contextName || "textarea" == contextName) {
-                    tokenizer.setStateAndEndTagExpectation(Tokenizer.RCDATA,
-                            contextName);
+                    tokenizer.setState(Tokenizer.RCDATA);
                 } else if ("style" == contextName || "xmp" == contextName
                         || "iframe" == contextName || "noembed" == contextName
                         || "noframes" == contextName
                         || (scriptingEnabled && "noscript" == contextName)) {
-                    tokenizer.setStateAndEndTagExpectation(Tokenizer.RAWTEXT,
-                            contextName);
+                    tokenizer.setState(Tokenizer.RAWTEXT);
                 } else if ("plaintext" == contextName) {
-                    tokenizer.setStateAndEndTagExpectation(Tokenizer.PLAINTEXT,
-                            contextName);
+                    tokenizer.setState(Tokenizer.PLAINTEXT);
                 } else if ("script" == contextName) {
-                    tokenizer.setStateAndEndTagExpectation(
-                            Tokenizer.SCRIPT_DATA, contextName);
+                    tokenizer.setState(Tokenizer.SCRIPT_DATA);
                 } else {
-                    tokenizer.setStateAndEndTagExpectation(Tokenizer.DATA,
-                            contextName);
+                    tokenizer.setState(Tokenizer.DATA);
                 }
             }
             contextName = null;
-- 
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