sist2/include/mce/helper.h

/*
 Copyright (c) 2010, Florian Reuter
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   may be used to endorse or promote products derived from this 
   software without specific prior written permission.
 
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*/
/** @file mce/helper.h
Helper functions needed by mce/textreader.h and mce/textwriter.h to implement MCE:
- mceQNameLevelAdd(), mceQNameLevelLookup() and mceQNameLevelCleanup() maintain a set of mceQNameLevel_t tuples.
- mceQNameLevelPush() and mceQNameLevelPopIfMatch() maintain a stack of mceQNameLevel_t tuples.
- mceCtxInit(), mceCtxCleanup() and mceCtxUnderstandsNamespace() manage a context which holds all information needed to do MCE proprocessing.
 */
#include <mce/config.h>

#ifndef MCE_HELPER_H
#define MCE_HELPER_H

#ifdef __cplusplus
extern "C" {
#endif

    /**
      Tiple (ns, ln, level).
    */
    typedef struct MCE_QNAME_LEVEL {
        xmlChar *ns;
        xmlChar *ln;
        puint32_t level;
        puint32_t flag; // used by mceTextWriter
    } mceQNameLevel_t;

    /**
     */
    typedef enum MCE_SKIP_STATE_ENUM {
        MCE_SKIP_STATE_IGNORE,
        MCE_SKIP_STATE_ALTERNATE_CONTENT,
        MCE_SKIP_STATE_CHOICE_MATCHED
    } mceSkipState_t;

    /**
     Represents an intervall of levels which are "skipped" i.e. ignored.
     */
    typedef struct MCE_SKIP_ITEM {
        puint32_t level_start;
        puint32_t level_end;
        mceSkipState_t state;
    } mceSkipItem_t;

    /**
      Either represents a set of (ns, ln, level) triples.
    */
    typedef struct MCE_QNAME_LEVEL_SET {
        mceQNameLevel_t *list_array;
        puint32_t list_items;
        puint32_t max_level;
    } mceQNameLevelSet_t;

    /**
     The skip stack.
     */
    typedef struct MCE_SKIP_STACK {
        mceSkipItem_t *stack_array;
        puint32_t stack_items;
    } mceSkipStack_t;


    typedef enum MCE_ERROR_ENUM {
        MCE_ERROR_NONE,
        MCE_ERROR_XML,
        MCE_ERROR_MUST_UNDERSTAND,
        MCE_ERROR_VALIDATION,
        MCE_ERROR_MEMORY
    } mceError_t;

    /**
      Holds all information to do MCE preprocessing.
    */
    typedef struct MCE_CONTEXT {
        mceQNameLevelSet_t ignorable_set;
        mceQNameLevelSet_t understands_set;
        mceQNameLevelSet_t processcontent_set;
        mceQNameLevelSet_t suspended_set;
#if (MCE_NAMESPACE_SUBSUMPTION_ENABLED)
        mceQNameLevelSet_t subsume_namespace_set;
        mceQNameLevelSet_t subsume_exclude_set;
        mceQNameLevelSet_t subsume_prefix_set;
#endif
        mceSkipStack_t skip_stack;
        mceError_t error;
        pbool_t mce_disabled;        
        puint32_t suspended_level;
    } mceCtx_t;

    /**
      Add a new tiple (ns, ln, level) to the triple set \c qname_level_set.
      The \c ns_sub string is optional and will not be touched.
    */
    pbool_t mceQNameLevelAdd(mceQNameLevelSet_t *qname_level_set, const xmlChar *ns, const xmlChar *ln, puint32_t level);

    /**
      Lookup a tiple (ns, ln, level) via \c ns and \c ln. If \c ignore_ln is PTRUE then the first tiple matching \c ns will be returned.
    */
    mceQNameLevel_t* mceQNameLevelLookup(mceQNameLevelSet_t *qname_level_set, const xmlChar *ns, const xmlChar *ln, pbool_t ignore_ln);

    /**
      Remove all triples (ns, ln, level) where the level greater or equal to \c level.
    */
    pbool_t mceQNameLevelCleanup(mceQNameLevelSet_t *qname_level_set, puint32_t level);

    /**
      Push a new skip intervall (level_start, level_end, state) on the stack \c skip_stack.
    */
    pbool_t mceSkipStackPush(mceSkipStack_t *skip_stack, puint32_t level_start, puint32_t level_end, mceSkipState_t state);

    /**
      Pop the intervall (ns, ln, level) from the stack \c qname_level_array.
    */
    void mceSkipStackPop(mceSkipStack_t *skip_stack);

    /**
     Returns top item or NULL.
     */
    mceSkipItem_t *mceSkipStackTop(mceSkipStack_t *skip_stack);

    /**
     Returns TRUE, if the \c level is in the top skip intervall.
     */
    pbool_t mceSkipStackSkip(mceSkipStack_t *skip_stack, puint32_t level);

    /**
      Initialize the mceCtx_t \c ctx.
    */
    pbool_t mceCtxInit(mceCtx_t *ctx);

    /**
      Cleanup, i.e. release all resourced from the mceCtx_t \c ctx.
    */
    pbool_t mceCtxCleanup(mceCtx_t *ctx);

    /**
      Register the namespace \ns in \c ctx.
    */
    pbool_t mceCtxUnderstandsNamespace(mceCtx_t *ctx, const xmlChar *ns);

    /**
     Register the namespace \ns in \c ctx.
     */
    pbool_t mceCtxSuspendProcessing(mceCtx_t *ctx, const xmlChar *ns, const xmlChar *ln);
    


#if (MCE_NAMESPACE_SUBSUMPTION_ENABLED)
    /**
    Subsume namespace \c ns_new with \c ns_old.
     */
    pbool_t mceCtxSubsumeNamespace(mceCtx_t *ctx, const xmlChar *prefix_new, const xmlChar *ns_new, const xmlChar *ns_old);
#endif

#ifdef __cplusplus
} /* extern "C" */
#endif

#endif /* MCE_HELPER_H */