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|
/*----------------------------------------------------------------------------
| Copyright (c) 1999 Jochen Loewer (loewerj@hotmail.com)
|-----------------------------------------------------------------------------
|
| A (partial) XPath implementation (lexer/parser/evaluator) for tDOM,
| the DOM implementation for Tcl.
| Based on the August 13 working draft of the W3C
| (http://www.w3.org/1999/08/WD-xpath-19990813.html)
|
|
| The contents of this file are subject to the Mozilla Public License
| Version 2.0 (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 tDOM.
|
| The Initial Developer of the Original Code is Jochen Loewer
| Portions created by Jochen Loewer are Copyright (C) 1998, 1999
| Jochen Loewer. All Rights Reserved.
|
| Contributor(s):
|
|
|
| written by Jochen Loewer
| July, 1999
|
\---------------------------------------------------------------------------*/
#ifndef __DOMXPATH_H__
#define __DOMXPATH_H__
#include <float.h>
#include <dom.h>
/*----------------------------------------------------------------------------
| Macros
|
\---------------------------------------------------------------------------*/
#define XPATH_OK 0
#define XPATH_LEX_ERR -1
#define XPATH_SYNTAX_ERR -2
#define XPATH_EVAL_ERR -3
#define XPATH_VAR_NOT_FOUND -4
#define XPATH_I18N_ERR -5
/*
* Macros for testing floating-point values for certain special cases. Test
* for not-a-number by comparing a value against itself; test for infinity
* by comparing against the largest floating-point value.
*/
#define IS_NAN(v) ((v) != (v))
#ifdef DBL_MAX
# define IS_INF(v) ((v) > DBL_MAX ? 1 : ((v) < -DBL_MAX ? -1 : 0))
#else
# define IS_INF(v) 0
#endif
/*----------------------------------------------------------------------------
| Types for abstract syntax trees
|
\---------------------------------------------------------------------------*/
typedef enum {
Int, Real, Mult, Div, Mod, UnaryMinus, IsNSElement,
IsNode, IsComment, IsText, IsPI, IsSpecificPI, IsElement,
IsFQElement, GetVar, GetFQVar, Literal, ExecFunction, Pred,
EvalSteps, SelectRoot, CombineSets, Add, Subtract, Less,
LessOrEq, Greater, GreaterOrEq, Equal, NotEqual, And, Or,
IsNSAttr, IsAttr, AxisAncestor, AxisAncestorOrSelf,
AxisAttribute, AxisChild,
AxisDescendant, AxisDescendantOrSelf, AxisFollowing,
AxisFollowingSibling, AxisNamespace, AxisParent,
AxisPreceding, AxisPrecedingSibling, AxisSelf,
GetContextNode, GetParentNode, AxisDescendantOrSelfLit,
AxisDescendantLit, SlashSlash,
CombinePath, IsRoot, ToParent, ToAncestors, FillNodeList,
FillWithCurrentNode,
ExecIdKey
} astType;
typedef struct astElem {
astType type;
struct astElem *child;
struct astElem *next;
char *strvalue;
long intvalue;
double realvalue;
} astElem;
typedef astElem *ast;
/*----------------------------------------------------------------------------
| Types for XPath result set
|
\---------------------------------------------------------------------------*/
typedef enum {
EmptyResult, BoolResult, IntResult, RealResult, StringResult,
xNodeSetResult, NaNResult, InfResult, NInfResult
} xpathResultType;
typedef struct xpathResultSet {
xpathResultType type;
char *string;
int string_len;
long intvalue;
double realvalue;
domNode **nodes;
int nr_nodes;
int allocated;
} xpathResultSet;
typedef xpathResultSet *xpathResultSets;
typedef int (*xpathFuncCallback)
(void *clientData, char *functionName,
domNode *ctxNode, int position, xpathResultSet *nodeList,
domNode *exprContext, int argc, xpathResultSets *args,
xpathResultSet *result, char **errMsg);
typedef int (*xpathVarCallback)
(void *clientData, char *variableName, char *varURI,
xpathResultSet *result, char **errMsg);
typedef struct xpathCBs { /* all xpath callbacks + clientData */
xpathVarCallback varCB;
void * varClientData;
xpathFuncCallback funcCB;
void * funcClientData;
} xpathCBs;
typedef char * (*xpathParseVarCallback)
(void *clientData, char *strToParse, int *offset, char **errMsg);
typedef struct xpathParseVarCB {
xpathParseVarCallback parseVarCB;
void * parseVarClientData;
} xpathParseVarCB;
/* XPath expr/pattern types */
typedef enum {
XPATH_EXPR, XPATH_FORMAT_PATTERN, XPATH_TEMPMATCH_PATTERN,
XPATH_KEY_USE_EXPR, XPATH_KEY_MATCH_PATTERN
} xpathExprType;
/*----------------------------------------------------------------------------
| Prototypes
|
\---------------------------------------------------------------------------*/
int xpathParse (char *xpath, domNode *exprContext, xpathExprType type,
char **prefixMappings, xpathParseVarCB *varParseCB,
ast *t, char **errMsg);
void xpathFreeAst (ast t);
double xpathGetPrio (ast t);
int xpathEval (domNode *node, domNode *exprContext, char *xpath,
char **prefixMappings, xpathCBs *cbs,
xpathParseVarCB *parseVarCB, Tcl_HashTable *catch,
char **errMsg, xpathResultSet *rs);
int xpathEvalAst (ast t, xpathResultSet *nodeList, domNode *node,
xpathCBs *cbs, xpathResultSet *rs, char **errMsg);
int xpathMatches (ast steps, domNode * exprContext, domNode *nodeToMatch,
xpathCBs *cbs, char **errMsg
);
int xpathEvalSteps (ast steps, xpathResultSet *nodeList,
domNode *currentNode, domNode *exprContext, int currentPos,
int *docOrder,
xpathCBs *cbs,
xpathResultSet *result, char **errMsg);
#define xpathRSInit(x) (x)->type = EmptyResult; \
(x)->intvalue = 0; \
(x)->nr_nodes = 0;
void xpathRSFree (xpathResultSet *rs);
void xpathRSReset (xpathResultSet *rs, domNode *ode);
int xpathFuncBoolean (xpathResultSet *rs);
double xpathFuncNumber (xpathResultSet *rs, int *NaN);
char * xpathFuncString (xpathResultSet *rs);
char * xpathFuncStringForNode (domNode *node);
int xpathRound (double r);
char * xpathGetStringValue (domNode *node, int *strLen);
char * xpathNodeToXPath (domNode *node, int legacy);
void rsSetBool ( xpathResultSet *rs, long i );
void rsSetInt ( xpathResultSet *rs, long i );
void rsSetReal ( xpathResultSet *rs, double d );
void rsSetString ( xpathResultSet *rs, const char *s );
void rsAddNode ( xpathResultSet *rs, domNode *node );
void rsAddNodeFast ( xpathResultSet *rs, domNode *node );
void rsCopy ( xpathResultSet *to, xpathResultSet *from );
/* This function is only used for debugging code */
void rsPrint ( xpathResultSet *rs );
/* This function is used (outside of tcldom.c) only by schema.c. It
* has to have a prototype somewhere. */
int tcldom_xpathFuncCallBack (
void *clientData,
char *functionName,
domNode *ctxNode,
int position,
xpathResultSet *nodeList,
domNode *exprContext,
int argc,
xpathResultSets *args,
xpathResultSet *result,
char **errMsg
);
#endif
|
