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diff --git a/vendor/masterminds/html5/src/HTML5/Parser/InputStream.php b/vendor/masterminds/html5/src/HTML5/Parser/InputStream.php
new file mode 100644
index 000000000..0bdc803b2
--- /dev/null
+++ b/vendor/masterminds/html5/src/HTML5/Parser/InputStream.php
@@ -0,0 +1,87 @@
+<?php
+namespace Masterminds\HTML5\Parser;
+
+/**
+ * Interface for stream readers.
+ *
+ * The parser only reads from streams. Various input sources can write
+ * an adapater to this InputStream.
+ *
+ * Currently provided InputStream implementations include
+ * FileInputStream and StringInputStream.
+ */
+interface InputStream extends \Iterator
+{
+
+    /**
+     * Returns the current line that is being consumed.
+     *
+     * TODO: Move this to the scanner.
+     */
+    public function currentLine();
+
+    /**
+     * Returns the current column of the current line that the tokenizer is at.
+     *
+     * Newlines are column 0. The first char after a newline is column 1.
+     *
+     * @TODO Move this to the scanner.
+     *
+     * @return int The column number.
+     */
+    public function columnOffset();
+
+    /**
+     * Get all characters until EOF.
+     *
+     * This consumes characters until the EOF.
+     */
+    public function remainingChars();
+
+    /**
+     * Read to a particular match (or until $max bytes are consumed).
+     *
+     * This operates on byte sequences, not characters.
+     *
+     * Matches as far as possible until we reach a certain set of bytes
+     * and returns the matched substring.
+     *
+     * @see strcspn
+     * @param string $bytes
+     *            Bytes to match.
+     * @param int $max
+     *            Maximum number of bytes to scan.
+     * @return mixed Index or false if no match is found. You should use strong
+     *         equality when checking the result, since index could be 0.
+     */
+    public function charsUntil($bytes, $max = null);
+
+    /**
+     * Returns the string so long as $bytes matches.
+     *
+     * Matches as far as possible with a certain set of bytes
+     * and returns the matched substring.
+     *
+     * @see strspn
+     * @param string $bytes
+     *            A mask of bytes to match. If ANY byte in this mask matches the
+     *            current char, the pointer advances and the char is part of the
+     *            substring.
+     * @param int $max
+     *            The max number of chars to read.
+     */
+    public function charsWhile($bytes, $max = null);
+
+    /**
+     * Unconsume one character.
+     *
+     * @param int $howMany
+     *            The number of characters to move the pointer back.
+     */
+    public function unconsume($howMany = 1);
+
+    /**
+     * Retrieve the next character without advancing the pointer.
+     */
+    public function peek();
+}