## xmlautomata

xmlautomata - API to build regexp automata

the API to build regexp automata

Author(s): Daniel Veillard

## Synopsis

    typedef struct _xmlAutomata xmlAutomata;
    typedef xmlAutomata * xmlAutomataPtr;
    typedef struct _xmlAutomataState xmlAutomataState;
    typedef xmlAutomataState * xmlAutomataStatePtr;
    xmlRegexpPtr	xmlAutomataCompile	(xmlAutomataPtr am);
    xmlAutomataStatePtr	xmlAutomataGetInitState	(xmlAutomataPtr am);
    int	xmlAutomataIsDeterminist	(xmlAutomataPtr am);
    xmlAutomataStatePtr	xmlAutomataNewAllTrans	(xmlAutomataPtr am,
    						 xmlAutomataStatePtr from,
    						 xmlAutomataStatePtr to,
    						 int lax);
    xmlAutomataStatePtr	xmlAutomataNewCountTrans	(xmlAutomataPtr am,
    							 xmlAutomataStatePtr from,
    							 xmlAutomataStatePtr to,
    							 const xmlChar * token,
    							 int min,
    							 int max,
    							 void * data);
    xmlAutomataStatePtr	xmlAutomataNewCountTrans2	(xmlAutomataPtr am,
    							 xmlAutomataStatePtr from,
    							 xmlAutomataStatePtr to,
    							 const xmlChar * token,
    							 const xmlChar * token2,
    							 int min,
    							 int max,
    							 void * data);
    xmlAutomataStatePtr	xmlAutomataNewCountedTrans	(xmlAutomataPtr am,
    							 xmlAutomataStatePtr from,
    							 xmlAutomataStatePtr to,
    							 int counter);
    int	xmlAutomataNewCounter		(xmlAutomataPtr am,
    					 int min,
    					 int max);
    xmlAutomataStatePtr	xmlAutomataNewCounterTrans	(xmlAutomataPtr am,
    							 xmlAutomataStatePtr from,
    							 xmlAutomataStatePtr to,
    							 int counter);
    xmlAutomataStatePtr	xmlAutomataNewEpsilon	(xmlAutomataPtr am,
    						 xmlAutomataStatePtr from,
    						 xmlAutomataStatePtr to);
    xmlAutomataStatePtr	xmlAutomataNewNegTrans	(xmlAutomataPtr am,
    						 xmlAutomataStatePtr from,
    						 xmlAutomataStatePtr to,
    						 const xmlChar * token,
    						 const xmlChar * token2,
    						 void * data);
    xmlAutomataStatePtr	xmlAutomataNewOnceTrans	(xmlAutomataPtr am,
    						 xmlAutomataStatePtr from,
    						 xmlAutomataStatePtr to,
    						 const xmlChar * token,
    						 int min,
    						 int max,
    						 void * data);
    xmlAutomataStatePtr	xmlAutomataNewOnceTrans2	(xmlAutomataPtr am,
    							 xmlAutomataStatePtr from,
    							 xmlAutomataStatePtr to,
    							 const xmlChar * token,
    							 const xmlChar * token2,
    							 int min,
    							 int max,
    							 void * data);
    xmlAutomataStatePtr	xmlAutomataNewState	(xmlAutomataPtr am);
    xmlAutomataStatePtr	xmlAutomataNewTransition	(xmlAutomataPtr am,
    							 xmlAutomataStatePtr from,
    							 xmlAutomataStatePtr to,
    							 const xmlChar * token,
    							 void * data);
    xmlAutomataStatePtr	xmlAutomataNewTransition2	(xmlAutomataPtr am,
    							 xmlAutomataStatePtr from,
    							 xmlAutomataStatePtr to,
    							 const xmlChar * token,
    							 const xmlChar * token2,
    							 void * data);
    int	xmlAutomataSetFinalState	(xmlAutomataPtr am,
    					 xmlAutomataStatePtr state);
    void	xmlFreeAutomata			(xmlAutomataPtr am);
    xmlAutomataPtr	xmlNewAutomata		(void);

## Description

## Details

### Structure xmlAutomata

    struct _xmlAutomata {
    The content of this structure is not made public by the API.
    } xmlAutomata;

### Typedef xmlAutomataPtr

    xmlAutomata * xmlAutomataPtr;

A libxml automata description, It can be compiled into a regexp

### Structure xmlAutomataState

    struct _xmlAutomataState {
    The content of this structure is not made public by the API.
    } xmlAutomataState;

### Typedef xmlAutomataStatePtr

    xmlAutomataState * xmlAutomataStatePtr;

A state int the automata description,

### xmlAutomataCompile ()

    xmlRegexpPtr	xmlAutomataCompile	(xmlAutomataPtr am)

Compile the automata into a Reg Exp ready for being executed. The automata should be free after this point.

`am`: | an automata
`Returns`: | the compiled regexp or NULL in case of error

### xmlAutomataGetInitState ()

    xmlAutomataStatePtr	xmlAutomataGetInitState	(xmlAutomataPtr am)

Initial state lookup

`am`: | an automata
`Returns`: | the initial state of the automata

### xmlAutomataIsDeterminist ()

    int	xmlAutomataIsDeterminist	(xmlAutomataPtr am)

Checks if an automata is determinist.

`am`: | an automata
`Returns`: | 1 if true, 0 if not, and -1 in case of error

### xmlAutomataNewAllTrans ()

    xmlAutomataStatePtr	xmlAutomataNewAllTrans	(xmlAutomataPtr am,
    						 xmlAutomataStatePtr from,
    						 xmlAutomataStatePtr to,
    						 int lax)

If @to is NULL, this creates first a new target state in the automata and then adds a an ALL transition from the @from state to the target state. That transition is an epsilon transition allowed only when all transitions from the @from node have been activated.

`am`: | an automata
`from`: | the starting point of the transition
`to`: | the target point of the transition or NULL
`lax`: | allow to transition if not all all transitions have been activated
`Returns`: | the target state or NULL in case of error

### xmlAutomataNewCountTrans ()

    xmlAutomataStatePtr	xmlAutomataNewCountTrans	(xmlAutomataPtr am,
    							 xmlAutomataStatePtr from,
    							 xmlAutomataStatePtr to,
    							 const xmlChar * token,
    							 int min,
    							 int max,
    							 void * data)

If @to is NULL, this creates first a new target state in the automata and then adds a transition from the @from state to the target state activated by a succession of input of value @token and whose number is between @min and @max

`am`: | an automata
`from`: | the starting point of the transition
`to`: | the target point of the transition or NULL
`token`: | the input string associated to that transition
`min`: | the minimum successive occurrences of token
`max`: | the maximum successive occurrences of token
`data`: | data associated to the transition
`Returns`: | the target state or NULL in case of error

### xmlAutomataNewCountTrans2 ()

    xmlAutomataStatePtr	xmlAutomataNewCountTrans2	(xmlAutomataPtr am,
    							 xmlAutomataStatePtr from,
    							 xmlAutomataStatePtr to,
    							 const xmlChar * token,
    							 const xmlChar * token2,
    							 int min,
    							 int max,
    							 void * data)

If @to is NULL, this creates first a new target state in the automata and then adds a transition from the @from state to the target state activated by a succession of input of value @token and @token2 and whose number is between @min and @max

`am`: | an automata
`from`: | the starting point of the transition
`to`: | the target point of the transition or NULL
`token`: | the input string associated to that transition
`token2`: | the second input string associated to that transition
`min`: | the minimum successive occurrences of token
`max`: | the maximum successive occurrences of token
`data`: | data associated to the transition
`Returns`: | the target state or NULL in case of error

### xmlAutomataNewCountedTrans ()

    xmlAutomataStatePtr	xmlAutomataNewCountedTrans	(xmlAutomataPtr am,
    							 xmlAutomataStatePtr from,
    							 xmlAutomataStatePtr to,
    							 int counter)

If @to is NULL, this creates first a new target state in the automata and then adds an epsilon transition from the @from state to the target state which will increment the counter provided

`am`: | an automata
`from`: | the starting point of the transition
`to`: | the target point of the transition or NULL
`counter`: | the counter associated to that transition
`Returns`: | the target state or NULL in case of error

### xmlAutomataNewCounter ()

    int	xmlAutomataNewCounter		(xmlAutomataPtr am,
    					 int min,
    					 int max)

Create a new counter

`am`: | an automata
`min`: | the minimal value on the counter
`max`: | the maximal value on the counter
`Returns`: | the counter number or -1 in case of error

### xmlAutomataNewCounterTrans ()

    xmlAutomataStatePtr	xmlAutomataNewCounterTrans	(xmlAutomataPtr am,
    							 xmlAutomataStatePtr from,
    							 xmlAutomataStatePtr to,
    							 int counter)

If @to is NULL, this creates first a new target state in the automata and then adds an epsilon transition from the @from state to the target state which will be allowed only if the counter is within the right range.

`am`: | an automata
`from`: | the starting point of the transition
`to`: | the target point of the transition or NULL
`counter`: | the counter associated to that transition
`Returns`: | the target state or NULL in case of error

### xmlAutomataNewEpsilon ()

    xmlAutomataStatePtr	xmlAutomataNewEpsilon	(xmlAutomataPtr am,
    						 xmlAutomataStatePtr from,
    						 xmlAutomataStatePtr to)

If @to is NULL, this creates first a new target state in the automata and then adds an epsilon transition from the @from state to the target state

`am`: | an automata
`from`: | the starting point of the transition
`to`: | the target point of the transition or NULL
`Returns`: | the target state or NULL in case of error

### xmlAutomataNewNegTrans ()

    xmlAutomataStatePtr	xmlAutomataNewNegTrans	(xmlAutomataPtr am,
    						 xmlAutomataStatePtr from,
    						 xmlAutomataStatePtr to,
    						 const xmlChar * token,
    						 const xmlChar * token2,
    						 void * data)

If @to is NULL, this creates first a new target state in the automata and then adds a transition from the @from state to the target state activated by any value except (@token,@token2) Note that if @token2 is not NULL, then (X, NULL) won't match to follow # the semantic of XSD ##other

`am`: | an automata
`from`: | the starting point of the transition
`to`: | the target point of the transition or NULL
`token`: | the first input string associated to that transition
`token2`: | the second input string associated to that transition
`data`: | data passed to the callback function if the transition is activated
`Returns`: | the target state or NULL in case of error

### xmlAutomataNewOnceTrans ()

    xmlAutomataStatePtr	xmlAutomataNewOnceTrans	(xmlAutomataPtr am,
    						 xmlAutomataStatePtr from,
    						 xmlAutomataStatePtr to,
    						 const xmlChar * token,
    						 int min,
    						 int max,
    						 void * data)

If @to is NULL, this creates first a new target state in the automata and then adds a transition from the @from state to the target state activated by a succession of input of value @token and whose number is between @min and @max, moreover that transition can only be crossed once.

`am`: | an automata
`from`: | the starting point of the transition
`to`: | the target point of the transition or NULL
`token`: | the input string associated to that transition
`min`: | the minimum successive occurrences of token
`max`: | the maximum successive occurrences of token
`data`: | data associated to the transition
`Returns`: | the target state or NULL in case of error

### xmlAutomataNewOnceTrans2 ()

    xmlAutomataStatePtr	xmlAutomataNewOnceTrans2	(xmlAutomataPtr am,
    							 xmlAutomataStatePtr from,
    							 xmlAutomataStatePtr to,
    							 const xmlChar * token,
    							 const xmlChar * token2,
    							 int min,
    							 int max,
    							 void * data)

If @to is NULL, this creates first a new target state in the automata and then adds a transition from the @from state to the target state activated by a succession of input of value @token and @token2 and whose number is between @min and @max, moreover that transition can only be crossed once.

`am`: | an automata
`from`: | the starting point of the transition
`to`: | the target point of the transition or NULL
`token`: | the input string associated to that transition
`token2`: | the second input string associated to that transition
`min`: | the minimum successive occurrences of token
`max`: | the maximum successive occurrences of token
`data`: | data associated to the transition
`Returns`: | the target state or NULL in case of error

### xmlAutomataNewState ()

    xmlAutomataStatePtr	xmlAutomataNewState	(xmlAutomataPtr am)

Create a new disconnected state in the automata

`am`: | an automata
`Returns`: | the new state or NULL in case of error

### xmlAutomataNewTransition ()

    xmlAutomataStatePtr	xmlAutomataNewTransition	(xmlAutomataPtr am,
    							 xmlAutomataStatePtr from,
    							 xmlAutomataStatePtr to,
    							 const xmlChar * token,
    							 void * data)

If @to is NULL, this creates first a new target state in the automata and then adds a transition from the @from state to the target state activated by the value of @token

`am`: | an automata
`from`: | the starting point of the transition
`to`: | the target point of the transition or NULL
`token`: | the input string associated to that transition
`data`: | data passed to the callback function if the transition is activated
`Returns`: | the target state or NULL in case of error

### xmlAutomataNewTransition2 ()

    xmlAutomataStatePtr	xmlAutomataNewTransition2	(xmlAutomataPtr am,
    							 xmlAutomataStatePtr from,
    							 xmlAutomataStatePtr to,
    							 const xmlChar * token,
    							 const xmlChar * token2,
    							 void * data)

If @to is NULL, this creates first a new target state in the automata and then adds a transition from the @from state to the target state activated by the value of @token

`am`: | an automata
`from`: | the starting point of the transition
`to`: | the target point of the transition or NULL
`token`: | the first input string associated to that transition
`token2`: | the second input string associated to that transition
`data`: | data passed to the callback function if the transition is activated
`Returns`: | the target state or NULL in case of error

### xmlAutomataSetFinalState ()

    int	xmlAutomataSetFinalState	(xmlAutomataPtr am,
    					 xmlAutomataStatePtr state)

Makes that state a final state

`am`: | an automata
`state`: | a state in this automata
`Returns`: | 0 or -1 in case of error

### xmlFreeAutomata ()

    void	xmlFreeAutomata			(xmlAutomataPtr am)

Free an automata

`am`: | an automata

### xmlNewAutomata ()

    xmlAutomataPtr	xmlNewAutomata		(void)

Create a new automata

`Returns`: | the new object or NULL in case of failure