xercesxpath.cpp

来自「IBM的解析xml的工具Xerces的源代码」· C++ 代码 · 共 1,455 行 · 第 1/4 页

        //
        // [37] NameTest ::= '*' | NCName ':' '*' | QName
        // [34] MultiplyOperator ::= '*'
        //
        case CHARTYPE_STAR:             // '*'
            //
            // 3.7 Lexical Structure
            //
            //  If there is a preceding token and the preceding token is not one of @, ::, (, [, , or
            //  an Operator, then a * must be recognized as a MultiplyOperator.
            //
            // Otherwise, the token must not be recognized as a MultiplyOperator.
            //
            if (starIsMultiplyOperator) {
                addToken(tokens, XercesXPath::EXPRTOKEN_OPERATOR_MULT);
                starIsMultiplyOperator = false;
            } else {
                addToken(tokens, XercesXPath::EXPRTOKEN_NAMETEST_ANY);
                starIsMultiplyOperator = true;
            }

            ++currentOffset;
            break;
        //
        // NCName, QName and non-terminals
        //
        case CHARTYPE_NONASCII: // possibly a valid non-ascii 'Letter' (BaseChar | Ideographic)
        case CHARTYPE_LETTER:
        case CHARTYPE_UNDERSCORE:
            //
            // 3.7 Lexical Structure
            //
            //  If there is a preceding token and the preceding token is not one of @, ::, (, [, , or
            //  an Operator, then an NCName must be recognized as an OperatorName.
            //
            //  If the character following an NCName (possibly after intervening ExprWhitespace) is (,
            //  then the token must be recognized as a NodeType or a FunctionName.
            //
            //  If the two characters following an NCName (possibly after intervening ExprWhitespace)
            //  are ::, then the token must be recognized as an AxisName.
            //
            //  Otherwise, the token must not be recognized as an OperatorName, a NodeType, a
            //  FunctionName, or an AxisName.
            //
            // [33] OperatorName ::= 'and' | 'or' | 'mod' | 'div'
            // [38] NodeType ::= 'comment' | 'text' | 'processing-instruction' | 'node'
            // [35] FunctionName ::= QName - NodeType
            // [6] AxisName ::= (see above)
            //
            // [37] NameTest ::= '*' | NCName ':' '*' | QName
            // [5] NCName ::= (Letter | '_') (NCNameChar)*
            // [?] NCNameChar ::= Letter | Digit | '.' | '-' | '_'  (ascii subset of 'NCNameChar')
            // [?] QName ::= (NCName ':')? NCName
            // [?] Letter ::= [A-Za-z]                              (ascii subset of 'Letter')
            // [?] Digit ::= [0-9]                                  (ascii subset of 'Digit')
            //
            nameOffset = currentOffset;
            currentOffset = scanNCName(data, endOffset, currentOffset);
            if (currentOffset == nameOffset) {
                return false; // REVISIT
			}

            if (currentOffset < endOffset) {
                ch = data[currentOffset];
            }
            else {
                ch = 0;
            }

            dataBuffer.set(data + nameOffset, currentOffset - nameOffset);
            nameHandle = fStringPool->addOrFind(dataBuffer.getRawBuffer());

            bool isNameTestNCName = false;
            bool isAxisName = false;
            prefixHandle = -1;

            if (ch == chColon) {

                if (++currentOffset == endOffset) {
                    return false; // REVISIT
                }

                ch = data[currentOffset];

                if (ch == chAsterisk) {
                    if (++currentOffset < endOffset) {
                        ch = data[currentOffset];
                    }

                    isNameTestNCName = true;
                } else if (ch == chColon) {
                    if (++currentOffset < endOffset) {
                        ch = data[currentOffset];
                    }

                    isAxisName = true;
                } else {
                    prefixHandle = nameHandle;
                    nameOffset = currentOffset;
                    currentOffset = scanNCName(data, endOffset, currentOffset);
                    if (currentOffset == nameOffset) {
                        return false; // REVISIT
                    }
                    if (currentOffset < endOffset) {
                        ch = data[currentOffset];
                    }
                    else {
                        ch = 0;
                    }

                    dataBuffer.set(data + nameOffset, currentOffset - nameOffset);
                    nameHandle = fStringPool->addOrFind(dataBuffer.getRawBuffer());
                }
            }
            //
            // [39] ExprWhitespace ::= S
            //
            while (XMLChar1_0::isWhitespace(ch)) {
                if (++currentOffset == endOffset) {
                    break;
                }
                ch = data[currentOffset];
            }

            //
            //  If there is a preceding token and the preceding token is not one of @, ::, (, [, , or
            //  an Operator, then an NCName must be recognized as an OperatorName.
            //
            if (starIsMultiplyOperator) {
                if (nameHandle == fAndSymbol) {
                    addToken(tokens, XercesXPath::EXPRTOKEN_OPERATOR_AND);
                    starIsMultiplyOperator = false;
                } else if (nameHandle == fOrSymbol) {
                    addToken(tokens, XercesXPath::EXPRTOKEN_OPERATOR_OR);
                    starIsMultiplyOperator = false;
                } else if (nameHandle == fModSymbol) {
                    addToken(tokens, XercesXPath::EXPRTOKEN_OPERATOR_MOD);
                    starIsMultiplyOperator = false;
                } else if (nameHandle == fDivSymbol) {
                    addToken(tokens, XercesXPath::EXPRTOKEN_OPERATOR_DIV);
                    starIsMultiplyOperator = false;
                } else {
                    return false; // REVISIT
                }

                if (isNameTestNCName) {
                    return false; // REVISIT - NCName:* where an OperatorName is required
                } else if (isAxisName) {
                    return false; // REVISIT - AxisName:: where an OperatorName is required
                }
                break;
            }
            //
            //  If the character following an NCName (possibly after intervening ExprWhitespace) is (,
            //  then the token must be recognized as a NodeType or a FunctionName.
            //
            if (ch == chOpenParen && !isNameTestNCName && !isAxisName) {
                if (nameHandle == fCommentSymbol) {
                    addToken(tokens, XercesXPath::EXPRTOKEN_NODETYPE_COMMENT);
                } else if (nameHandle == fTextSymbol) {
                    addToken(tokens, XercesXPath::EXPRTOKEN_NODETYPE_TEXT);
                } else if (nameHandle == fPISymbol) {
                    addToken(tokens, XercesXPath::EXPRTOKEN_NODETYPE_PI);
                } else if (nameHandle == fNodeSymbol) {
                    addToken(tokens, XercesXPath::EXPRTOKEN_NODETYPE_NODE);
                } else {
                    addToken(tokens, XercesXPath::EXPRTOKEN_FUNCTION_NAME);
                    tokens->addElement(prefixHandle);
                    tokens->addElement(nameHandle);
                }
                addToken(tokens, XercesXPath::EXPRTOKEN_OPEN_PAREN);
                starIsMultiplyOperator = false;
                ++currentOffset;
                break;
            }

            //
            //  If the two characters following an NCName (possibly after intervening ExprWhitespace)
            //  are ::, then the token must be recognized as an AxisName.
            //
            if (isAxisName ||
                (ch == chColon && currentOffset + 1 < endOffset &&
                 data[currentOffset + 1] == chColon)) {

                if (nameHandle == fAncestorSymbol) {
                    addToken(tokens, XercesXPath::EXPRTOKEN_AXISNAME_ANCESTOR);
                } else if (nameHandle == fAncestorOrSelfSymbol) {
                    addToken(tokens, XercesXPath::EXPRTOKEN_AXISNAME_ANCESTOR_OR_SELF);
                } else if (nameHandle == fAttributeSymbol) {
                    addToken(tokens, XercesXPath::EXPRTOKEN_AXISNAME_ATTRIBUTE);
                } else if (nameHandle == fChildSymbol) {
                    addToken(tokens, XercesXPath::EXPRTOKEN_AXISNAME_CHILD);
                } else if (nameHandle == fDescendantSymbol) {
                    addToken(tokens, XercesXPath::EXPRTOKEN_AXISNAME_DESCENDANT);
                } else if (nameHandle == fDescendantOrSelfSymbol) {
                    addToken(tokens, XercesXPath::EXPRTOKEN_AXISNAME_DESCENDANT_OR_SELF);
                } else if (nameHandle == fFollowingSymbol) {
                    addToken(tokens, XercesXPath::EXPRTOKEN_AXISNAME_FOLLOWING);
                } else if (nameHandle == fFollowingSiblingSymbol) {
                    addToken(tokens, XercesXPath::EXPRTOKEN_AXISNAME_FOLLOWING_SIBLING);
                } else if (nameHandle == fNamespaceSymbol) {
                    addToken(tokens, XercesXPath::EXPRTOKEN_AXISNAME_NAMESPACE);
                } else if (nameHandle == fParentSymbol) {
                    addToken(tokens, XercesXPath::EXPRTOKEN_AXISNAME_PARENT);
                } else if (nameHandle == fPrecedingSymbol) {
                    addToken(tokens, XercesXPath::EXPRTOKEN_AXISNAME_PRECEDING);
                } else if (nameHandle == fPrecedingSiblingSymbol) {
                    addToken(tokens, XercesXPath::EXPRTOKEN_AXISNAME_PRECEDING_SIBLING);
                } else if (nameHandle == fSelfSymbol) {
                    addToken(tokens, XercesXPath::EXPRTOKEN_AXISNAME_SELF);
                } else {
                    return false; // REVISIT
                }

                if (isNameTestNCName) {
                    return false; // REVISIT - "NCName:* ::" where "AxisName ::" is required
                }

                addToken(tokens, XercesXPath::EXPRTOKEN_DOUBLE_COLON);
                starIsMultiplyOperator = false;
                if (!isAxisName) {
                    currentOffset += 2;
                }
                break;
            }
            //
            //  Otherwise, the token must not be recognized as an OperatorName, a NodeType, a
            //  FunctionName, or an AxisName.
            //
            if (isNameTestNCName) {
                addToken(tokens, XercesXPath::EXPRTOKEN_NAMETEST_NAMESPACE);
                tokens->addElement(nameHandle);
            } else {
                addToken(tokens, XercesXPath::EXPRTOKEN_NAMETEST_QNAME);
                tokens->addElement(prefixHandle);
                tokens->addElement(nameHandle);
            }

            starIsMultiplyOperator = true;
            break;
        }
    }

    return true;
}


int XPathScanner::scanNCName(const XMLCh* const data,
                             const int endOffset,
                             int currentOffset) {

    XMLCh ch = data[currentOffset];

    if (!XMLChar1_0::isXMLLetter(ch) && ch != chUnderscore) {
        return currentOffset;
    }

    while (++currentOffset < endOffset) {

        ch = data[currentOffset];

        if (ch == chColon || !XMLChar1_0::isNameChar(ch)) {
            break;
        }
    }

    return currentOffset;
}


int XPathScanner::scanNumber(const XMLCh* const data,
                             const int endOffset,
                             int currentOffset,
                             ValueVectorOf<int>* const tokens) {

    XMLCh ch = data[currentOffset];
    int   whole = 0;
    int   part = 0;

    while (ch >= chDigit_0 && ch <= chDigit_9) {

        whole = (whole * 10) + (ch - chDigit_0);

        if (++currentOffset == endOffset) {
            break;
        }

        ch = data[currentOffset];
    }

    if (ch == chPeriod) {

        if (++currentOffset < endOffset) {

            ch = data[currentOffset];

            while (ch >= chDigit_0 && ch <= chDigit_9) {

                part = (part * 10) + (ch - chDigit_0);

                if (++currentOffset == endOffset) {
                    break;
                }

                ch = data[currentOffset];
            }

            if (part != 0) {
                ThrowXMLwithMemMgr(RuntimeException, XMLExcepts::XPath_FindSolution, tokens->getMemoryManager());
            }
        }
    }

    tokens->addElement(whole);
    tokens->addElement(part);

    return currentOffset;
}


// ---------------------------------------------------------------------------
//  XPathScannerForSchema: Constructors and Destructor
// ---------------------------------------------------------------------------
XPathScannerForSchema::XPathScannerForSchema(XMLStringPool* const stringPool)
    : XPathScanner(stringPool)
{
}


// ---------------------------------------------------------------------------
//  XPathScannerForSchema: Helper methods
// ---------------------------------------------------------------------------
void XPathScannerForSchema::addToken(ValueVectorOf<int>* const tokens,
                                     const int aToken) {

    if (aToken == XercesXPath::EXPRTOKEN_ATSIGN ||
        aToken == XercesXPath::EXPRTOKEN_AXISNAME_ATTRIBUTE ||
        aToken == XercesXPath::EXPRTOKEN_AXISNAME_CHILD ||
        //token == XercesXPath::EXPRTOKEN_AXISNAME_SELF ||
        aToken == XercesXPath::EXPRTOKEN_DOUBLE_COLON ||
        aToken == XercesXPath::EXPRTOKEN_NAMETEST_QNAME ||
        //token == XercesXPath::EXPRTOKEN_NODETYPE_NODE ||
        aToken == XercesXPath::EXPRTOKEN_OPERATOR_SLASH ||
        aToken == XercesXPath::EXPRTOKEN_PERIOD ||
        aToken == XercesXPath::EXPRTOKEN_NAMETEST_ANY ||
        aToken == XercesXPath::EXPRTOKEN_NAMETEST_NAMESPACE ||
        aToken == XercesXPath::EXPRTOKEN_OPERATOR_DOUBLE_SLASH ||
        aToken == XercesXPath::EXPRTOKEN_OPERATOR_UNION) {

        tokens->addElement(aToken);
        return;
    }

    ThrowXMLwithMemMgr(XPathException, XMLExcepts::XPath_TokenNotSupported, tokens->getMemoryManager());
}

XERCES_CPP_NAMESPACE_END

/**
  * End of file XercesPath.cpp
  */