box.h

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#pragma once
#ifndef INC_BOX_H
#define INC_BOX_H
#include "global.h"
    // [type] Integer, Pointer, QuarterWord, Scaled, SmallNumber, HalfWord
#include "mem.h" // [var] mem, hi_mem_min; [macro] link, type, subtype
#include "texmath.h" // [macro] INF_BAD
#include "str.h" // [type] StrNumber
 
#define type(x)         (mem[(x)].hh.UU.U2.b0)
#define subtype(x)      (mem[(x)].hh.UU.U2.b1)
 
#define is_char_node(x)   ((x) >= hi_mem_min)
 
#ifdef BIG_CHARNODE
#define font(x)         link(x + 1)
/* #define font(x)  info(x+1) */
#else
#define font(x)         type(x)
#endif // #ifdef BIG_CHARNODE
 
#define character(x)    subtype(x)
 
#ifdef BIG_CHARNODE
#define CHAR_NODE_SIZE 2
#define font_ligchar(x) type(ligchar(x))
#define character_ligchar(x) subtype(ligchar(x))
#else
#define CHAR_NODE_SIZE 1
#define font_ligchar(x) font(ligchar(x))
#define character_ligchar(x) character(ligchar(x))
#endif // #ifdef BIG_CHARNODE
 
 
enum NodeType {
    HLIST_NODE,  
    VLIST_NODE,  
    RULE_NODE,   
    INS_NODE,    
    MARK_NODE,   
    ADJUST_NODE, 
 
    LIGATURE_NODE, 
    DISC_NODE,     
    WHATSIT_NODE,  
    MATH_NODE,     
    GLUE_NODE, 
 
    KERN_NODE,    
    PENALTY_NODE, 
    UNSET_NODE,   
}; // enum NodeType
 
#define boxnodesize     7
#define widthoffset     1
#define depthoffset     2
#define heightoffset    3
 
#define width(x)        mem[x + widthoffset].sc
#define depth(x)        mem[x + depthoffset].sc
#define height(x)       mem[x + heightoffset].sc
 
#define shiftamount(x)  mem[x + 4].sc
#define listoffset      5
#define listptr(x)      link(x + listoffset)
#define glueorder(x)    subtype(x + listoffset)
#define gluesign(x)     type(x + listoffset)
 
#define NORMAL          0
#define stretching      1
#define shrinking       2
#define glueoffset      6
#define glueset(x)      mem[x + glueoffset].gr
 
#define rulenodesize    4
#define nullflag        (-1073741824L)
#define isrunning(x)    ((x) == nullflag)
 
 
#define insnodesize     5
#define floatcost(x)    mem[x + 1].int_
#define insptr(x)       info(x + 4)
#define splittopptr(x)  link(x + 4)
 
#define smallnodesize   2
#define markptr(x)      mem[x + 1].int_
 
#define adjustptr       markptr
 
#define ligchar(x)      ((x) + 1)
#define ligptr(x)       link(ligchar(x))
 
 
#define replacecount    subtype 
#define prebreak        llink   
#define postbreak       rlink
 
 
#define before          0
#define after           1
 
#define precedesbreak(x)    (type(x) < MATH_NODE)
#define nondiscardable(x)   (type(x) < MATH_NODE)
 
#define condmathglue    98
#define muglue          99
#define aleaders        100
#define cleaders        101
#define xleaders        102
#define glueptr         llink   
#define leaderptr       rlink
 
 
#define gluespecsize    4
#define gluerefcount(x) link(x)
#define stretch(x)      mem[x + 2].sc
#define shrink(x)       mem[x + 3].sc
#define stretchorder(x) type(x)
#define shrinkorder(x)  subtype(x)
enum InfinityOrder {
    FIL = 1, 
    FILL,    
    FILLL    
}; // [#150] enum InfinityOrder
 
 
#define explicit        1
#define acckern         2
 
#define INF_PENALTY     INF_BAD
#define EJECT_PENALTY   (-INF_PENALTY)
#define penalty(x)      mem[x + 1].int_ 
 
 
#define gluestretch(x)  mem[x + glueoffset].sc    
#define glueshrink      shiftamount 
#define spancount       subtype
#define nodelistdisplay(x) (append_char('.'), shownodelist(x), flush_char()) // end group S173x198_P62x68
 
// [#200] reference count preceding a token list
#define tokenrefcount(x) info(x) // end group S199x202_P69x70
 
#define addtokenref(x)  (tokenrefcount(x)++)
#define addglueref(x)   (gluerefcount(x)++) // end group S203x206_P71x72
 
 
// box_display
extern Integer font_in_short_display;
extern Integer depth_threshold;
extern Integer breadth_max;
 
// [box], tex, scan
extern Pointer new_null_box(void);
extern Pointer new_rule(void);
extern Pointer new_ligature(QuarterWord f, QuarterWord c, Pointer q);
extern Pointer new_lig_item(QuarterWord c);
extern Pointer new_disc(void);
extern Pointer new_math(Scaled w, SmallNumber s);
extern Pointer new_spec(Pointer p);
extern Pointer new_param_glue(SmallNumber n);
extern Pointer new_glue(Pointer q);
extern Pointer new_skip_param(SmallNumber n);
extern Pointer new_kern(long w);
extern Pointer new_penalty(long m);
 
// box_display
extern void shortdisplay(Pointer p);
extern void printspec(Integer p, StrNumber s);
extern void shownodelist(Integer p);
extern void showbox(HalfWord p);
 
// box_destroy
extern void delete_token_ref(HalfWord p);
extern void delete_glue_ref(HalfWord p);
extern void flush_node_list(HalfWord p);
 
// box_copy
extern HalfWord copynodelist(HalfWord p);
 
#endif /* INC_BOX_H */