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nsParserUtils.cpp

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla Communicator client code.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
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 *
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 * either of the GNU General Public License Version 2 or later (the "GPL"),
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/*
 * Namespace class for some static parsing-related methods.
 */

#include "nsParserUtils.h"
#include "nsIParser.h" // for kQuote et. al.
#include "jsapi.h"
#include "nsReadableUtils.h"
#include "nsCRT.h"
#include "nsContentUtils.h"
#include "nsIParserService.h"

#define SKIP_WHITESPACE(iter, end_iter, end_res)                 \
  while ((iter) != (end_iter) && nsCRT::IsAsciiSpace(*(iter))) { \
    ++(iter);                                                    \
  }                                                              \
  if ((iter) == (end_iter)) {                                    \
    return (end_res);                                            \
  }

#define SKIP_ATTR_NAME(iter, end_iter)                            \
  while ((iter) != (end_iter) && !nsCRT::IsAsciiSpace(*(iter)) && \
         *(iter) != '=') {                                        \
    ++(iter);                                                     \
  }

PRBool
nsParserUtils::GetQuotedAttributeValue(const nsString& aSource, nsIAtom *aName,
                                       nsAString& aValue)
{
  aValue.Truncate();

  const PRUnichar *start = aSource.get();
  const PRUnichar *end = start + aSource.Length();
  const PRUnichar *iter;
  
  while (start != end) {
    SKIP_WHITESPACE(start, end, PR_FALSE)
    iter = start;
    SKIP_ATTR_NAME(iter, end)

    if (start == iter) {
      return PR_FALSE;
    }

    // Remember the attr name.
    const nsDependentSubstring & attrName = Substring(start, iter);

    // Now check whether this is a valid name="value" pair.
    start = iter;
    SKIP_WHITESPACE(start, end, PR_FALSE)
    if (*start != '=') {
      // No '=', so this is not a name="value" pair.  We don't know
      // what it is, and we have no way to handle it.
      return PR_FALSE;
    }
    
    // Have to skip the value.
    ++start;
    SKIP_WHITESPACE(start, end, PR_FALSE)
    PRUnichar q = *start;
    if (q != kQuote && q != kApostrophe) {
      // Not a valid quoted value, so bail.
      return PR_FALSE;
    }
    
    ++start;  // Point to the first char of the value.
    iter = start;

    while (iter != end && *iter != q) {
      ++iter;
    }

    if (iter == end) {
      // Oops, unterminated quoted string.
      return PR_FALSE;
    }

    // At this point attrName holds the name of the "attribute" and
    // the value is between start and iter.
    
    if (aName->Equals(attrName)) {
      nsIParserService* parserService = nsContentUtils::GetParserService();
      NS_ENSURE_TRUE(parserService, PR_FALSE);

      // We'll accumulate as many characters as possible (until we hit either
      // the end of the string or the beginning of an entity). Chunks will be
      // delimited by start and chunkEnd.
      const PRUnichar *chunkEnd = start;
      while (chunkEnd != iter) {
        if (*chunkEnd == kLessThan) {
          aValue.Truncate();

          return PR_FALSE;
        }

        if (*chunkEnd == kAmpersand) {
          aValue.Append(start, chunkEnd - start);

          // Point to first character after the ampersand.
          ++chunkEnd;

          const PRUnichar *afterEntity;
          PRUnichar result[2];
          PRUint32 count =
            parserService->DecodeEntity(chunkEnd, iter, &afterEntity, result);
          if (count == 0) {
            aValue.Truncate();

            return PR_FALSE;
          }

          aValue.Append(result, count);

          // Advance to after the entity and begin a new chunk.
          start = chunkEnd = afterEntity;
        }
        else {
          ++chunkEnd;
        }
      }

      // Append remainder.
      aValue.Append(start, iter - start);

      return PR_TRUE;
    }

    // Resume scanning after the end of the attribute value (past the quote
    // char).
    start = iter + 1;
  }

  return PR_FALSE;
}

PRBool
nsParserUtils::GetQuotedAttrNameAt(const nsString& aSource, PRUint32 aIndex,
                                   nsAString& aName)
{
  aName.Truncate();

  const PRUnichar *start = aSource.get();
  const PRUnichar *end = start + aSource.Length();
  const PRUnichar *iter;
  PRUint32 currIndex = 0;
  
  for (;;) {
    SKIP_WHITESPACE(start, end, PR_TRUE)

    iter = start;
    SKIP_ATTR_NAME(iter, end)

    if (start == iter) {
      return PR_FALSE;
    }

    // Remember the attr name.
    const nsDependentSubstring & attrName = Substring(start, iter);

    // Now check whether this is a valid name="value" pair.
    start = iter;
    SKIP_WHITESPACE(start, end, PR_FALSE);
    if (*start != '=') {
      // No '=', so this is not a name="value" pair.  We don't know
      // what it is, and we have no way to handle it.
      return PR_FALSE;
    }
    
    // Have to skip the value.
    ++start;
    SKIP_WHITESPACE(start, end, PR_FALSE);
    PRUnichar q = *start;
    if (q != kQuote && q != kApostrophe) {
      // Not a valid quoted value, so bail.
      return PR_FALSE;
    }
    
    // Scan to the end of the value.
    do {
      ++start;
    } while (start != end && *start != q);

    if (start == end) {
      // Oops, unterminated quoted string.
      return PR_FALSE;
    }

    // At this point attrName holds the name of the "attribute"
    
    if (aIndex == currIndex) {
      aName = attrName;

      return PR_TRUE;
    }

    // Resume scanning after the end of the attribute value (past the quote
    // char).
    ++start;
    ++currIndex;
  }

  return PR_TRUE;
}

// Returns PR_TRUE if the language name is a version of JavaScript and
// PR_FALSE otherwise
PRBool
nsParserUtils::IsJavaScriptLanguage(const nsString& aName, PRUint32 *aFlags)
{
  JSVersion version = JSVERSION_UNKNOWN;

  if (aName.LowerCaseEqualsLiteral("javascript") ||
      aName.LowerCaseEqualsLiteral("livescript") ||
      aName.LowerCaseEqualsLiteral("mocha")) {
    version = JSVERSION_DEFAULT;
  }
  else if (aName.LowerCaseEqualsLiteral("javascript1.0")) {
    version = JSVERSION_1_0;
  }
  else if (aName.LowerCaseEqualsLiteral("javascript1.1")) {
    version = JSVERSION_1_1;
  }
  else if (aName.LowerCaseEqualsLiteral("javascript1.2")) {
    version = JSVERSION_1_2;
  }
  else if (aName.LowerCaseEqualsLiteral("javascript1.3")) {
    version = JSVERSION_1_3;
  }
  else if (aName.LowerCaseEqualsLiteral("javascript1.4")) {
    version = JSVERSION_1_4;
  }
  else if (aName.LowerCaseEqualsLiteral("javascript1.5")) {
    version = JSVERSION_1_5;
  }
  else if (aName.LowerCaseEqualsLiteral("javascript1.6")) {
    version = JSVERSION_1_6;
  }
  else if (aName.LowerCaseEqualsLiteral("javascript1.7")) {
    version = JSVERSION_1_7;
  }
  else if (aName.LowerCaseEqualsLiteral("javascript1.8")) {
    version = JSVERSION_1_8;
  }
  if (version == JSVERSION_UNKNOWN)
    return PR_FALSE;
  *aFlags = version;
  return PR_TRUE;
}

void
nsParserUtils::SplitMimeType(const nsAString& aValue, nsString& aType,
                             nsString& aParams)
{
  aType.Truncate();
  aParams.Truncate();
  PRInt32 semiIndex = aValue.FindChar(PRUnichar(';'));
  if (-1 != semiIndex) {
    aType = Substring(aValue, 0, semiIndex);
    aParams = Substring(aValue, semiIndex + 1,
                       aValue.Length() - (semiIndex + 1));
    aParams.StripWhitespace();
  }
  else {
    aType = aValue;
  }
  aType.StripWhitespace();
}

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