page.h

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#pragma once
#ifndef INC_PAGE_H
//
#define INC_PAGE_H
#include "global.h"
#include "lexer.h" // [var] nest; [macro] ignoredepth
 
#define activeheight        activewidth
#define curheight           (activeheight[0])
#define setheightzero(x)    (activeheight[(x)-1] = 0)
// [p361#970]
#define updateheights       90
 
// [p363#974]
#define deplorable          100000L // end group S967x979_P360x365
 
// [p366#980]
#define insertsonly     1
#define boxthere        2
// [p367#981]
#define pageinsnodesize  4
#define inserting        0
#define splitup          1
// [p371#994]
#define contribute      80
 
#define brokenptr(x)    link(x+1)
#define brokenins(x)    info(x+1) /* this insertion might break at |brokenptr|}*/
#define lastinsptr(x)   link(x+2) /* the most recent insertion for this |subtype|}*/
#define bestinsptr(x)   info(x+2) /* the optimum most recent insertion}*/
 
#define setpagesofarzero(x) (pagesofar[(x)] = 0)
 
#define pagegoal    (pagesofar[0])
#define pagetotal   (pagesofar[1])  /*height of the current page*/
#define pageshrink  (pagesofar[6]) /*shrinkability of the current page*/
#define pagedepth   (pagesofar[7])  /*depth of the current page*/
 
#define contribtail (nest[0].tailfield) /*tail of the contribution list*/ // end group S980x1028_P366x382
 
 
extern Pointer pagetail;
extern char pagecontents;
extern Scaled pagesofar[8];
extern Pointer lastglue;
extern Scaled lastkern;
extern Integer lastpenalty;
extern Integer insertpenalties;
extern Boolean outputactive;
 
extern void page_builder_init();
extern void page_builder_init_once();
// lexer
extern void printtotals(void);
extern void boxerror(EightBits n);
extern void buildpage(void);
 
 
extern Scaled bestheightplusdepth;
extern HalfWord prunepagetop(HalfWord p);
extern HalfWord vertbreak(HalfWord p, long h, long d);
extern HalfWord vsplit(EightBits n, long h);
 
#endif /* INC_PAGE_H */