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/* SGML parse and stream definition for libwww
SGML AND STRUCTURED STREAMS
The SGML parser is a state machine. It is called for every character
of the input stream. The DTD data structure contains pointers
to functions which are called to implement the actual effect of the
text read. When these functions are called, the attribute structures pointed to by the
DTD are valid, and the function is passed a pointer to the curent tag structure, and an
"element stack" which represents the state of nesting within SGML elements.
The following aspects are from Dan Connolly's suggestions: Binary search, Strcutured
object scheme basically, SGML content enum type.
(c) Copyright CERN 1991 - See Copyright.html
*/
#ifndef SGML_H
#define SGML_H
#ifndef HTUTILS_H
#include "HTUtils.h"
#endif /* HTUTILS_H */
#include "HTStream.h"
#include "HTAnchor.h"
/*
SGML content types
*/
typedef enum _SGMLContent {
SGML_EMPTY, /* No content. */
SGML_LITTERAL, /* Literal character data. Recognize exact close tag only.
Old www server compatibility only! Not SGML */
SGML_CDATA, /* Character data. Recognize </ only. */
SGML_RCDATA, /* Replaceable character data. Recognize </ and &ref; */
SGML_MIXED, /* Elements and parsed character data.
Recognize all markup. */
SGML_ELEMENT, /* Any data found will be returned as an error. */
SGML_PCDATA /* Added by KW. */
} SGMLContent;
typedef struct {
char * name; /* The (constant) name of the attribute */
/* Could put type info in here */
} attr;
typedef enum _TagClass {
/* textflow */
Tgc_FONTlike = 0x00001,/* S,STRIKE,I,B,TT,U,BIG,SMALL,STYLE,BLINK;BR,TAB */
Tgc_EMlike = 0x00002, /* EM,STRONG,DFN,CODE,SAMP,KBD,VAR,CITE,Q,INS,DEL,SPAN,.. */
Tgc_MATHlike = 0x00004, /* SUB,SUP,MATH,COMMENT */
Tgc_Alike = 0x00008, /* A */
Tgc_formula = 0x00010, /* not used until math is supported better... */
/* used for special structures: forms, tables,... */
Tgc_TRlike = 0x00020,/* TR and similar */
Tgc_SELECTlike = 0x00040,/* SELECT,INPUT,TEXTAREA(,...) */
/* structure */
Tgc_FORMlike = 0x00080,/* FORM itself */
Tgc_Plike = 0x00100, /* P,H1..H6,... structures containing text or
insertion but not other structures */
Tgc_DIVlike = 0x00200, /* ADDRESS,FIG,BDO,NOTE,FN,DIV,CENTER;FIG
structures which can contain other structures */
Tgc_LIlike = 0x00400, /* LH,LI,DT,DD;TH,TD structure-like, only valid
within certain other structures */
Tgc_ULlike = 0x00800, /* UL,OL,DL,DIR,MENU;TABLE;XMP,LISTING
special in some way, cannot contain (parsed)
text directly */
/* insertions */
Tgc_BRlike = 0x01000,/* BR,IMG,TAB allowed in any text */
Tgc_APPLETlike = 0x02000, /* APPLET,OBJECT,EMBED,SCRIPT */
Tgc_HRlike = 0x04000, /* HR,MARQUEE can contain all kinds of things
and/or are not allowed (?) in running text */
Tgc_MAPlike = 0x08000, /* MAP,AREA some specials that never contain
(directly or indirectly) other things than
special insertions */
Tgc_outer = 0x10000, /* HTML,FRAMESET,FRAME,PLAINTEXT; */
Tgc_BODYlike = 0x20000, /* BODY,BODYTEXT,NOFRAMES,TEXTFLOW; */
Tgc_HEADstuff = 0x40000, /* HEAD,BASE,STYLE,TITLE; */
/* special relations */
Tgc_same = 0x80000
} TagClass;
/* Some more properties of tags (or rather, elements) and rules how
to deal with them. - kw */
typedef enum _TagFlags {
Tgf_endO = 0x00001, /* end tag can be Omitted */
Tgf_startO = 0x00002, /* start tag can be Omitted */
Tgf_mafse = 0x00004 /* Make Attribute-Free Start-tag End instead
(if found invalid) */
} TagFlags;
/* A tag structure describes an SGML element.
** -----------------------------------------
**
**
** name is the string which comes after the tag opener "<".
**
** attributes points to a zero-terminated array
** of attribute names.
**
** litteral determines how the SGML engine parses the charaters
** within the element. If set, tag openers are ignored
** except for that which opens a matching closing tag.
**
*/
typedef struct _tag HTTag;
struct _tag{
char * name; /* The name of the tag */
attr * attributes; /* The list of acceptable attributes */
int number_of_attributes; /* Number of possible attributes */
SGMLContent contents; /* End only on end tag @@ */
TagClass tagclass,
contains, /* which classes of elements this one can contain directly */
icontains, /* which classes of elements this one can contain indirectly */
contained, /* in which classes can this tag be contained ? */
icontained, /* in which classes can this tag be indirectly contained ? */
canclose; /* which classes of elements can this one close
if something looks wrong ? */
TagFlags flags;
};
/* DTD Information
** ---------------
**
** Not the whole DTD, but all this parser uses of it.
*/
#ifdef EXP_CHARTRANS
typedef struct {
char* name;
long code;
} UC_entity_info;
#endif
typedef struct {
HTTag * tags; /* Must be in strcmp order by name */
int number_of_tags;
CONST char ** entity_names; /* Must be in strcmp order by name */
int number_of_entities;
#ifdef EXP_CHARTRANS
CONST UC_entity_info * extra_entity_info; /* strcmp order by name */
int number_of_extra_entities;
#endif
} SGML_dtd;
/* SGML context passed to parsers
*/
typedef struct _HTSGMLContext *HTSGMLContext; /* Hidden */
/*__________________________________________________________________________
*/
/*
Structured Object definition
A structured object is something which can reasonably be represented
in SGML. I'll rephrase that. A structured object is am ordered
tree-structured arrangement of data which is representable as text.
The SGML parer outputs to a Structured object. A Structured object
can output its contents to another Structured Object. It's a kind of
typed stream. The architecure is largely Dan Conolly's. Elements and
entities are passed to the sob by number, implying a knowledge of the
DTD. Knowledge of the SGML syntax is not here, though.
Superclass: HTStream
The creation methods will vary on the type of Structured Object.
Maybe the callerData is enough info to pass along.
*/
typedef struct _HTStructured HTStructured;
typedef struct _HTStructuredClass{
char* name; /* Just for diagnostics */
void (*_free) PARAMS((
HTStructured* me));
void (*_abort) PARAMS((
HTStructured* me,
HTError e));
void (*put_character) PARAMS((
HTStructured* me,
char ch));
void (*put_string) PARAMS((
HTStructured* me,
CONST char * str));
void (*_write) PARAMS((
HTStructured* me,
CONST char * str,
int len));
void (*start_element) PARAMS((
HTStructured* me,
int element_number,
CONST BOOL* attribute_present,
CONST char** attribute_value,
char ** include));
void (*end_element) PARAMS((
HTStructured* me,
int element_number,
char ** include));
int (*put_entity) PARAMS((
HTStructured* me,
int entity_number));
}HTStructuredClass;
/*
Find a Tag by Name
Returns a pointer to the tag within the DTD.
*/
extern HTTag * SGMLFindTag PARAMS((
CONST SGML_dtd * dtd,
CONST char * string));
/*
Create an SGML parser
*/
/*
** On entry,
** dtd must point to a DTD structure as defined above
** callbacks must point to user routines.
** callData is returned in callbacks transparently.
** On exit,
** The default tag starter has been processed.
*/
extern HTStream * SGML_new PARAMS((
CONST SGML_dtd * dtd,
HTParentAnchor * anchor,
HTStructured * target));
extern CONST HTStreamClass SGMLParser;
#endif /* SGML_H */
/*
*/
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