<?php
namespace HTML5\Tests;

use \HTML5\InputStream;

require_once 'TestCase.php';

class InputStreamTest extends TestCase {
  const INVALID = "\xEF\xBF\xBD";

  public function testBOM() {

    // Ignore in-text BOM.
    $stream = new InputStream("a\xEF\xBB\xBF");
    $this->assertEquals("a\xEF\xBB\xBF", $stream->remainingChars(), 'A non-leading U+FEFF (BOM/ZWNBSP) should remain');

    // Strip leading BOM
    $leading = new InputStream("\xEF\xBB\xBFa");
    $this->assertEquals('a', $leading->char(), 'BOM should be stripped');
  }

  public function testCarriageReturn() {

    // Replace NULL with Unicode replacement.
    $stream = new InputStream("\0\0\0");
    $this->assertEquals("\xEF\xBF\xBD\xEF\xBF\xBD\xEF\xBF\xBD", $stream->remainingChars(), 'Null character should be replaced by U+FFFD');
    $this->assertEquals(3, count($stream->errors), 'Null character should set parse error: ' . print_r($stream->errors, TRUE));

    // Remove CR when next to LF.
    $stream = new InputStream("\r\n");
    $this->assertEquals("\n", $stream->remainingChars(), 'CRLF should be replaced by LF');

    // Convert CR to LF when on its own.
    $stream = new InputStream("\r");
    $this->assertEquals("\n", $stream->remainingChars(), 'CR should be replaced by LF');
  }


  public function invalidParseErrorTestHandler($input, $numErrors, $name) {
    $stream = new InputStream($input);
    $this->assertEquals($input, $stream->remainingChars(), $name . ' (stream content)');
    $this->assertEquals($numErrors, count($stream->errors), $name . ' (number of errors)');
  }

  public function testInvalidReplace() {
    $invalidTest = array(

      // Min/max overlong
      "\xC0\x80a" => 'Overlong representation of U+0000',
      "\xE0\x80\x80a" => 'Overlong representation of U+0000',
      "\xF0\x80\x80\x80a" => 'Overlong representation of U+0000',
      "\xF8\x80\x80\x80\x80a" => 'Overlong representation of U+0000',
      "\xFC\x80\x80\x80\x80\x80a" => 'Overlong representation of U+0000',
      "\xC1\xBFa" => 'Overlong representation of U+007F',
      "\xE0\x9F\xBFa" => 'Overlong representation of U+07FF',
      "\xF0\x8F\xBF\xBFa" => 'Overlong representation of U+FFFF',


      "a\xDF" => 'Incomplete two byte sequence (missing final byte)',
      "a\xEF\xBF" => 'Incomplete three byte sequence (missing final byte)',
      "a\xF4\xBF\xBF" => 'Incomplete four byte sequence (missing final byte)',

      // Min/max continuation bytes
      "a\x80" => 'Lone 80 continuation byte',
      "a\xBF" => 'Lone BF continuation byte',

      // Invalid bytes (these can never occur)
      "a\xFE" => 'Invalid FE byte',
      "a\xFF" => 'Invalid FF byte',
    );
    foreach ($invalidTest as $test => $note) {
      $stream = new InputStream($test);
      $this->assertEquals('a', $stream->remainingChars(), $note);
    }

    // MPB:
    // It appears that iconv just leaves these alone. Not sure what to 
    // do.
    /*
    $converted = array(
      "a\xF5\x90\x80\x80" => 'U+110000, off unicode planes.',
    );
    foreach ($converted as $test => $note) {
      $stream = new InputStream($test);
      $this->assertEquals(2, mb_strlen($stream->remainingChars()), $note);
    }
     */
  }

  public function testInvalidParseError() {
    // C0 controls (except U+0000 and U+000D due to different handling)
    $this->invalidParseErrorTestHandler("\x01", 1, 'U+0001 (C0 control)');
    $this->invalidParseErrorTestHandler("\x02", 1, 'U+0002 (C0 control)');
    $this->invalidParseErrorTestHandler("\x03", 1, 'U+0003 (C0 control)');
    $this->invalidParseErrorTestHandler("\x04", 1, 'U+0004 (C0 control)');
    $this->invalidParseErrorTestHandler("\x05", 1, 'U+0005 (C0 control)');
    $this->invalidParseErrorTestHandler("\x06", 1, 'U+0006 (C0 control)');
    $this->invalidParseErrorTestHandler("\x07", 1, 'U+0007 (C0 control)');
    $this->invalidParseErrorTestHandler("\x08", 1, 'U+0008 (C0 control)');
    $this->invalidParseErrorTestHandler("\x09", 0, 'U+0009 (C0 control)');
    $this->invalidParseErrorTestHandler("\x0A", 0, 'U+000A (C0 control)');
    $this->invalidParseErrorTestHandler("\x0B", 1, 'U+000B (C0 control)');
    $this->invalidParseErrorTestHandler("\x0C", 0, 'U+000C (C0 control)');
    $this->invalidParseErrorTestHandler("\x0E", 1, 'U+000E (C0 control)');
    $this->invalidParseErrorTestHandler("\x0F", 1, 'U+000F (C0 control)');
    $this->invalidParseErrorTestHandler("\x10", 1, 'U+0010 (C0 control)');
    $this->invalidParseErrorTestHandler("\x11", 1, 'U+0011 (C0 control)');
    $this->invalidParseErrorTestHandler("\x12", 1, 'U+0012 (C0 control)');
    $this->invalidParseErrorTestHandler("\x13", 1, 'U+0013 (C0 control)');
    $this->invalidParseErrorTestHandler("\x14", 1, 'U+0014 (C0 control)');
    $this->invalidParseErrorTestHandler("\x15", 1, 'U+0015 (C0 control)');
    $this->invalidParseErrorTestHandler("\x16", 1, 'U+0016 (C0 control)');
    $this->invalidParseErrorTestHandler("\x17", 1, 'U+0017 (C0 control)');
    $this->invalidParseErrorTestHandler("\x18", 1, 'U+0018 (C0 control)');
    $this->invalidParseErrorTestHandler("\x19", 1, 'U+0019 (C0 control)');
    $this->invalidParseErrorTestHandler("\x1A", 1, 'U+001A (C0 control)');
    $this->invalidParseErrorTestHandler("\x1B", 1, 'U+001B (C0 control)');
    $this->invalidParseErrorTestHandler("\x1C", 1, 'U+001C (C0 control)');
    $this->invalidParseErrorTestHandler("\x1D", 1, 'U+001D (C0 control)');
    $this->invalidParseErrorTestHandler("\x1E", 1, 'U+001E (C0 control)');
    $this->invalidParseErrorTestHandler("\x1F", 1, 'U+001F (C0 control)');
    
    // DEL (U+007F)
    $this->invalidParseErrorTestHandler("\x7F", 1, 'U+007F');
    
    // C1 Controls
    $this->invalidParseErrorTestHandler("\xC2\x80", 1, 'U+0080 (C1 control)');
    $this->invalidParseErrorTestHandler("\xC2\x9F", 1, 'U+009F (C1 control)');
    $this->invalidParseErrorTestHandler("\xC2\xA0", 0, 'U+00A0 (first codepoint above highest C1 control)');
    
    // Single UTF-16 surrogates
    $this->invalidParseErrorTestHandler("\xED\xA0\x80", 1, 'U+D800 (UTF-16 surrogate character)');
    $this->invalidParseErrorTestHandler("\xED\xAD\xBF", 1, 'U+DB7F (UTF-16 surrogate character)');
    $this->invalidParseErrorTestHandler("\xED\xAE\x80", 1, 'U+DB80 (UTF-16 surrogate character)');
    $this->invalidParseErrorTestHandler("\xED\xAF\xBF", 1, 'U+DBFF (UTF-16 surrogate character)');
    $this->invalidParseErrorTestHandler("\xED\xB0\x80", 1, 'U+DC00 (UTF-16 surrogate character)');
    $this->invalidParseErrorTestHandler("\xED\xBE\x80", 1, 'U+DF80 (UTF-16 surrogate character)');
    $this->invalidParseErrorTestHandler("\xED\xBF\xBF", 1, 'U+DFFF (UTF-16 surrogate character)');
    
    // Paired UTF-16 surrogates
    $this->invalidParseErrorTestHandler("\xED\xA0\x80\xED\xB0\x80", 2, 'U+D800 U+DC00 (paired UTF-16 surrogates)');
    $this->invalidParseErrorTestHandler("\xED\xA0\x80\xED\xBF\xBF", 2, 'U+D800 U+DFFF (paired UTF-16 surrogates)');
    $this->invalidParseErrorTestHandler("\xED\xAD\xBF\xED\xB0\x80", 2, 'U+DB7F U+DC00 (paired UTF-16 surrogates)');
    $this->invalidParseErrorTestHandler("\xED\xAD\xBF\xED\xBF\xBF", 2, 'U+DB7F U+DFFF (paired UTF-16 surrogates)');
    $this->invalidParseErrorTestHandler("\xED\xAE\x80\xED\xB0\x80", 2, 'U+DB80 U+DC00 (paired UTF-16 surrogates)');
    $this->invalidParseErrorTestHandler("\xED\xAE\x80\xED\xBF\xBF", 2, 'U+DB80 U+DFFF (paired UTF-16 surrogates)');
    $this->invalidParseErrorTestHandler("\xED\xAF\xBF\xED\xB0\x80", 2, 'U+DBFF U+DC00 (paired UTF-16 surrogates)');
    $this->invalidParseErrorTestHandler("\xED\xAF\xBF\xED\xBF\xBF", 2, 'U+DBFF U+DFFF (paired UTF-16 surrogates)');
    
    // Charcters surrounding surrogates
    $this->invalidParseErrorTestHandler("\xED\x9F\xBF", 0, 'U+D7FF (one codepoint below lowest surrogate codepoint)');
    $this->invalidParseErrorTestHandler("\xEF\xBF\xBD", 0, 'U+DE00 (one codepoint above highest surrogate codepoint)');
    
    // Permanent noncharacters
    $this->invalidParseErrorTestHandler("\xEF\xB7\x90", 1, 'U+FDD0 (permanent noncharacter)');
    $this->invalidParseErrorTestHandler("\xEF\xB7\xAF", 1, 'U+FDEF (permanent noncharacter)');
    $this->invalidParseErrorTestHandler("\xEF\xBF\xBE", 1, 'U+FFFE (permanent noncharacter)');
    $this->invalidParseErrorTestHandler("\xEF\xBF\xBF", 1, 'U+FFFF (permanent noncharacter)');
    $this->invalidParseErrorTestHandler("\xF0\x9F\xBF\xBE", 1, 'U+1FFFE (permanent noncharacter)');
    $this->invalidParseErrorTestHandler("\xF0\x9F\xBF\xBF", 1, 'U+1FFFF (permanent noncharacter)');
    $this->invalidParseErrorTestHandler("\xF0\xAF\xBF\xBE", 1, 'U+2FFFE (permanent noncharacter)');
    $this->invalidParseErrorTestHandler("\xF0\xAF\xBF\xBF", 1, 'U+2FFFF (permanent noncharacter)');
    $this->invalidParseErrorTestHandler("\xF0\xBF\xBF\xBE", 1, 'U+3FFFE (permanent noncharacter)');
    $this->invalidParseErrorTestHandler("\xF0\xBF\xBF\xBF", 1, 'U+3FFFF (permanent noncharacter)');
    $this->invalidParseErrorTestHandler("\xF1\x8F\xBF\xBE", 1, 'U+4FFFE (permanent noncharacter)');
    $this->invalidParseErrorTestHandler("\xF1\x8F\xBF\xBF", 1, 'U+4FFFF (permanent noncharacter)');
    $this->invalidParseErrorTestHandler("\xF1\x9F\xBF\xBE", 1, 'U+5FFFE (permanent noncharacter)');
    $this->invalidParseErrorTestHandler("\xF1\x9F\xBF\xBF", 1, 'U+5FFFF (permanent noncharacter)');
    $this->invalidParseErrorTestHandler("\xF1\xAF\xBF\xBE", 1, 'U+6FFFE (permanent noncharacter)');
    $this->invalidParseErrorTestHandler("\xF1\xAF\xBF\xBF", 1, 'U+6FFFF (permanent noncharacter)');
    $this->invalidParseErrorTestHandler("\xF1\xBF\xBF\xBE", 1, 'U+7FFFE (permanent noncharacter)');
    $this->invalidParseErrorTestHandler("\xF1\xBF\xBF\xBF", 1, 'U+7FFFF (permanent noncharacter)');
    $this->invalidParseErrorTestHandler("\xF2\x8F\xBF\xBE", 1, 'U+8FFFE (permanent noncharacter)');
    $this->invalidParseErrorTestHandler("\xF2\x8F\xBF\xBF", 1, 'U+8FFFF (permanent noncharacter)');
    $this->invalidParseErrorTestHandler("\xF2\x9F\xBF\xBE", 1, 'U+9FFFE (permanent noncharacter)');
    $this->invalidParseErrorTestHandler("\xF2\x9F\xBF\xBF", 1, 'U+9FFFF (permanent noncharacter)');
    $this->invalidParseErrorTestHandler("\xF2\xAF\xBF\xBE", 1, 'U+AFFFE (permanent noncharacter)');
    $this->invalidParseErrorTestHandler("\xF2\xAF\xBF\xBF", 1, 'U+AFFFF (permanent noncharacter)');
    $this->invalidParseErrorTestHandler("\xF2\xBF\xBF\xBE", 1, 'U+BFFFE (permanent noncharacter)');
    $this->invalidParseErrorTestHandler("\xF2\xBF\xBF\xBF", 1, 'U+BFFFF (permanent noncharacter)');
    $this->invalidParseErrorTestHandler("\xF3\x8F\xBF\xBE", 1, 'U+CFFFE (permanent noncharacter)');
    $this->invalidParseErrorTestHandler("\xF3\x8F\xBF\xBF", 1, 'U+CFFFF (permanent noncharacter)');
    $this->invalidParseErrorTestHandler("\xF3\x9F\xBF\xBE", 1, 'U+DFFFE (permanent noncharacter)');
    $this->invalidParseErrorTestHandler("\xF3\x9F\xBF\xBF", 1, 'U+DFFFF (permanent noncharacter)');
    $this->invalidParseErrorTestHandler("\xF3\xAF\xBF\xBE", 1, 'U+EFFFE (permanent noncharacter)');
    $this->invalidParseErrorTestHandler("\xF3\xAF\xBF\xBF", 1, 'U+EFFFF (permanent noncharacter)');
    $this->invalidParseErrorTestHandler("\xF3\xBF\xBF\xBE", 1, 'U+FFFFE (permanent noncharacter)');
    $this->invalidParseErrorTestHandler("\xF3\xBF\xBF\xBF", 1, 'U+FFFFF (permanent noncharacter)');
    $this->invalidParseErrorTestHandler("\xF4\x8F\xBF\xBE", 1, 'U+10FFFE (permanent noncharacter)');
    $this->invalidParseErrorTestHandler("\xF4\x8F\xBF\xBF", 1, 'U+10FFFF (permanent noncharacter)');
  }
}