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eqn.h
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eqn.h
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/*
* NEATEQN MAIN HEADER
*
* In Neateqn equations are recursively decomposed into boxes. eqn.c
* reads the input and makes eqn boxes by calling appropriate functions
* from box.c.
*/
/* predefined array sizes */
#define FNLEN 32 /* font name length */
#define SZLEN 32 /* point size length */
#define LNLEN 1000 /* line length */
#define NMLEN 32 /* macro name length */
#define RLEN 8 /* register name length */
#define NPILES 32 /* number of piled items */
#define NSIZES 8 /* number of bracket sizes */
#define GNLEN 32 /* glyph name length */
#define BRLEN 64 /* bracket definition length */
/* registers used by neateqn */
#define EQNSZ ".eqnsz" /* register for surrounding point size */
#define EQNFN ".eqnfn" /* register for surrounding font */
#define EQNS "10" /* eqn-collected line register */
#define EQNMK ".eqnmk" /* eqn horizontal mark */
/* helpers */
#define MIN(a, b) ((a) < (b) ? (a) : (b))
#define MAX(a, b) ((a) < (b) ? (b) : (a))
#define LEN(a) (sizeof(a) / sizeof((a)[0]))
/* token and atom types */
#define T_TOK(t) ((t) & 0x00ff)
#define T_ATOM(t) ((t) & 0x00f0)
#define T_FONT(t) ((t) & T_ITALIC)
#define T_ATOMIDX(t) ((((t) >> 4) & 15) - 1)
#define T_EOF 0x0000 /* parser-specific */
#define T_SPACE 0x0001
#define T_TAB 0x0002
#define T_KEYWORD 0x0003
#define T_ORD 0x0010 /* ordinary */
#define T_LETTER 0x0011
#define T_NUMBER 0x0012
#define T_STRING 0x0013
#define T_GAP 0x0014
#define T_BIGOP 0x0020 /* big operators */
#define T_BINOP 0x0030 /* binary operators */
#define T_RELOP 0x0040 /* relational symbol */
#define T_LEFT 0x0050 /* opening token */
#define T_RIGHT 0x0060 /* closing token */
#define T_PUNC 0x0070 /* punctuation symbol */
#define T_INNER 0x0080 /* like fractions */
#define T_ITALIC 0x0100 /* atom with italic font */
/* spaces in hundredths of em */
#define S_S1 e_thinspace /* thin space */
#define S_S2 e_mediumspace /* medium space */
#define S_S3 e_thickspace /* thick space */
/* small helper functions */
void errdie(char *msg);
/* reading the source */
int src_next(void);
void src_back(int c);
void src_define(char *name, char *def);
int src_expand(char *name, char **args);
int src_macro(char *name);
int src_arg(int i);
int src_top(void);
int src_lineget(void);
void src_lineset(int n);
void src_done(void);
/* tokenizer */
int tok_eqn(void);
void tok_eqnout(char *s);
char *tok_get(void);
char *tok_pop(void);
char *tok_poptext(int sep);
int tok_jmp(char *kwd);
int tok_type(void);
int tok_chops(int soft);
void tok_delim(void);
void tok_macro(void);
int tok_inline(void);
/* default definitions and operators */
int def_type(char *s);
void def_typeput(char *s, int type);
int def_chopped(int c);
void def_choppedset(char *s);
void def_pieces(char *sign, char **top, char **mid, char **bot, char **cen);
void def_sizes(char *sign, char *sizes[]);
int def_brcost(int type);
void def_piecesput(char *sign, char *top, char *mid, char *bot, char *cen);
void def_sizesput(char *sign, char *sizes[]);
void def_brcostput(int type, int cost);
extern char *def_macros[][2];
/* variable length string buffer */
struct sbuf {
char *s; /* allocated buffer */
int sz; /* buffer size */
int n; /* length of the string stored in s */
};
void sbuf_init(struct sbuf *sbuf);
void sbuf_done(struct sbuf *sbuf);
char *sbuf_buf(struct sbuf *sbuf);
void sbuf_add(struct sbuf *sbuf, int c);
void sbuf_append(struct sbuf *sbuf, char *s);
void sbuf_printf(struct sbuf *sbuf, char *s, ...);
void sbuf_cut(struct sbuf *sbuf, int n);
int sbuf_len(struct sbuf *sbuf);
int sbuf_empty(struct sbuf *sbuf);
/* tex styles */
#define TS_D 0x00
#define TS_D0 0x01
#define TS_T 0x02
#define TS_T0 0x03
#define TS_S 0x10
#define TS_S0 0x11
#define TS_SS 0x20
#define TS_SS0 0x21
#define TS_MK(s, p) (((s) << 4) | (p))
#define TS_0(s) ((s) & 0x01) /* primed variant */
#define TS_MK0(s) ((s) | 0x01) /* make style primed */
#define TS_SZ(s) ((s) >> 4) /* character size */
#define TS_DX(s) ((s) == TS_D || (s) == TS_D0)
#define TS_TXT(s) ((s) & 0x02) /* text style */
int ts_sup(int style);
int ts_sub(int style);
int ts_denom(int style);
int ts_num(int style);
/* equations */
struct box {
struct sbuf raw; /* the contents */
int szreg, szown; /* number register holding box size */
int reg; /* register holding the contents */
int atoms; /* the number of atoms inserted */
int tbeg, tcur; /* type of the first and the last atoms */
int style; /* tex style (TS_*) */
char *tomark; /* register for saving box width */
};
struct box *box_alloc(int szreg, int at_pre, int style);
void box_free(struct box *box);
void box_puttext(struct box *box, int type, char *s, ...);
void box_putf(struct box *box, char *s, ...);
int box_size(struct box *box, char *val);
void box_merge(struct box *box, struct box *sub, int breakable);
void box_sub(struct box *box, struct box *sub, struct box *sup);
void box_from(struct box *box, struct box *lim, struct box *llim, struct box *ulim);
void box_over(struct box *box, struct box *num, struct box *denom);
void box_sqrt(struct box *box, struct box *sub);
void box_bar(struct box *box);
void box_under(struct box *box);
void box_accent(struct box *box, char *c);
void box_wrap(struct box *box, struct box *sub, char *left, char *right);
void box_move(struct box *box, int dy, int dx);
void box_gap(struct box *box, int n);
char *box_buf(struct box *box);
char *box_toreg(struct box *box);
void box_vertspace(struct box *box);
int box_empty(struct box *box);
void box_markpos(struct box *box, char *regname);
void box_vcenter(struct box *box, struct box *sub);
void box_pile(struct box *box, struct box **pile, int adj, int rowspace);
void box_matrix(struct box *box, int ncols, struct box *cols[][NPILES],
int *adj, int colspace, int rowspace);
/* managing registers */
char *escarg(char *arg);
int sregmk(void);
void sregrm(int id);
int nregmk(void);
void nregrm(int id);
char *nreg(int id);
char *sreg(int id);
char *nregname(int id);
char *sregname(int id);
void reg_reset(void);
/* eqn global variables */
extern int e_axisheight;
extern int e_minimumsize;
extern int e_overhang;
extern int e_nulldelim;
extern int e_scriptspace;
extern int e_thinspace;
extern int e_mediumspace;
extern int e_thickspace;
extern int e_num1;
extern int e_num2;
extern int e_denom1;
extern int e_denom2;
extern int e_sup1;
extern int e_sup2;
extern int e_sup3;
extern int e_sub1;
extern int e_sub2;
extern int e_supdrop;
extern int e_subdrop;
extern int e_xheight;
extern int e_rulethickness;
extern int e_bigopspacing1;
extern int e_bigopspacing2;
extern int e_bigopspacing3;
extern int e_bigopspacing4;
extern int e_bigopspacing5;
extern int e_columnsep;
extern int e_baselinesep;
extern int e_bodyheight;
extern int e_bodydepth;
void def_set(char *name, int val);