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/*
** This file contains code used to tokenize SGML.
*/
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <stdlib.h>
#include <assert.h>
#include "sgmlparse.h"
#define stricmp strcasecmp
/* These three pointers define certain special handlers. All whitespace
** is sent to xSpaceHandler. Non-whitespace is given to xWordHandler.
** Any markup that isn't specifically directed elsewhere is given
** to xDefaultMarkupHandlers.
*/
static void (*xSpaceHandler)(const char*,void*);
static void (*xWordHandler)(const char*,void*);
static void (*xCommentHandler)(const char*,void*);
static void (*xDefaultMarkupHandler)(int, const char**, void*);
/* Each handler is stored in a hash table as an instance of the
** following structure.
*/
typedef struct sgHandler Handler;
struct sgHandler {
char *zName; /* Name of markup to handle */
void (*xHandler)(int, const char**, void*); /* Routine to do the work */
Handler *pCollide; /* Next handler with same hash */
};
/* The size of the handler hash table.
** For best results, this should be a prime number which is larger than
** the number of markups in the hash table.
*/
#define SGML_HASH_SIZE 203
/* The handler hash table */
static Handler *apHandler[SGML_HASH_SIZE];
/* Hash a handler name */
static int SgmlHash(const char *zName){
int h = 0;
char c;
while( (c=*zName)!=0 ){
if( isupper(c) ) c = tolower(c);
h = h<<5 ^ h ^ c;
zName++;
}
if( h<0 ) h = -h;
return h % SGML_HASH_SIZE;
}
/* Given a pointer to an input file, read and parse that file
** as if it were SGML.
**
** This is not a true SGML parser because it handles some unusual
** cases differently, and ignores the & operator completely.
*/
void SgmlParse(FILE *in, void *pArg){
int c;
int i, j;
int argc;
Handler *pHandler;
char *argv[100];
char zBuf[10000];
c = getc(in);
while( c!=EOF ){
if( isspace(c) ){
/* Case 1: spaces */
zBuf[0] = c;
i = 1;
while( i<sizeof(zBuf)-2 && (c=getc(in))!=EOF && isspace(c) ){
zBuf[i++] = c;
}
zBuf[i] = 0;
/* Dispose of space */
if( xSpaceHandler ){
(*xSpaceHandler)(zBuf,pArg);
}
}else if( c=='<' ){
int cQuote = 0;
i = 0;
zBuf[i++] = c;
while( (c=getc(in))!=EOF && (cQuote || c!='>') ){
if( i<sizeof(zBuf)-3 ) zBuf[i++] = c;
if( cQuote ){
if( cQuote==c ) cQuote = 0;
}else if( c=='"' || c=='\'' ){
cQuote = c;
}
}
if( c=='>' ) c = getc(in);
zBuf[i] = 0;
if( strncmp(zBuf,"<!--",4)==0 ){
zBuf[i++] = '>';
zBuf[i] = 0;
if( xCommentHandler ){
(*xCommentHandler)(zBuf,pArg);
}
continue;
}
argc = 0;
argv[0] = &zBuf[1];
for(j=1; zBuf[j] && !isspace(zBuf[j]); j++){}
if( zBuf[j] ){
zBuf[j++] = 0;
while( argc<(sizeof(argv)/sizeof(argv[0])) - 4 && zBuf[j] ){
while( isspace(zBuf[j]) ) j++;
argv[++argc] = &zBuf[j];
while( zBuf[j] && !isspace(zBuf[j]) && zBuf[j]!='=' ) j++;
if( zBuf[j]!='=' ){
argv[argc+1] = argv[argc];
argc++;
if( zBuf[j] ) zBuf[j++] = 0;
continue;
}
zBuf[j++] = 0;
if( zBuf[j]=='"' || zBuf[j]=='\'' ){
cQuote = zBuf[j++];
}else{
cQuote = 0;
}
argv[++argc] = &zBuf[j];
if( cQuote ){
while( zBuf[j] && zBuf[j]!=cQuote ) j++;
}else{
while( zBuf[j] && !isspace(zBuf[j]) ) j++;
}
if( zBuf[j] ) zBuf[j++] = 0;
}
}
argv[++argc] = 0;
/* Despose of a markup */
pHandler = apHandler[SgmlHash(argv[0])];
while( pHandler && stricmp(pHandler->zName,argv[0])!=0 ){
pHandler = pHandler->pCollide;
}
if( pHandler ){
if( pHandler->xHandler ){
(*pHandler->xHandler)(argc,(const char**)argv,pArg);
}
}else if( xDefaultMarkupHandler ){
(*xDefaultMarkupHandler)(argc,(const char**)argv,pArg);
}
}else{
zBuf[0] = c;
i = 1;
while( i<sizeof(zBuf)-2 && (c=getc(in))!=EOF && c!='<' && !isspace(c) ){
zBuf[i++] = c;
}
zBuf[i] = 0;
/* Dispose of a word */
if( xWordHandler ){
(*xWordHandler)(zBuf,pArg);
}
}
}
}
/*
** Clear out the handler hash table
*/
void SgmlHandlerReset(void){
Handler *pHandler;
int i;
for(i=0; i<SGML_HASH_SIZE; i++){
Handler *pNext;
for(pHandler=apHandler[i]; pHandler; pHandler=pNext){
pNext = pHandler->pCollide;
free(pHandler);
}
apHandler[i] = 0;
}
}
/* Install a new handler
*/
void SgmlHandler(const char *zName, void (*xFunc)(int,const char**,void*)){
int h = SgmlHash(zName);
extern void *malloc();
Handler *pNew = malloc( sizeof(Handler) + strlen(zName) + 1 );
if( pNew==0 ) return;
pNew->zName = (char*)&pNew[1];
strcpy(pNew->zName,zName);
pNew->pCollide = apHandler[h];
pNew->xHandler = xFunc;
apHandler[h] = pNew;
}
/* Install the default handlers
*/
void SgmlWordHandler(void (*xWord)(const char*,void*)){
xWordHandler = xWord;
}
void SgmlSpaceHandler(void (*xSpace)(const char*,void*)){
xSpaceHandler = xSpace;
}
void SgmlCommentHandler(void (*xComment)(const char*,void*)){
xCommentHandler = xComment;
}
void SgmlDefaultMarkupHandler(void (*xMarkup)(int,const char**,void*)){
xDefaultMarkupHandler = xMarkup;
}
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