eqn.h

   1 /* predefined array sizes */
   2 #define FNLEN           32      /* font name length */
   3 #define SZLEN           32      /* point size length */
   4 #define LNLEN           1000    /* line length */
   5 #define NMLEN           32      /* macro name length */
   6 #define RLEN            8       /* register name length */
   7 #define NPILES          32      /* number of piled items */
   8 #define NSIZES          8       /* number of bracket sizes */
   9 #define GNLEN           32      /* glyph name length */
  10 #define BRLEN           64      /* bracket definition length */
  11
  12 /* registers used by neateqn */
  13 #define EQNSZ           ".eqnsz"        /* register for surrounding point size */
  14 #define EQNFN           ".eqnfn"        /* register for surrounding font */
  15 #define EQNS            "10"            /* eqn-collected line register */
  16 #define EQNMK           ".eqnmk"        /* eqn horizontal mark */
  17
  18 /* helpers */
  19 #define MIN(a, b)       ((a) < (b) ? (a) : (b))
  20 #define MAX(a, b)       ((a) < (b) ? (b) : (a))
  21 #define LEN(a)          (sizeof(a) / sizeof((a)[0]))
  22
  23 /* token and atom types */
  24 #define T_TOK(t)        ((t) & 0x00ff)
  25 #define T_ATOM(t)       ((t) & 0x00f0)
  26 #define T_FONT(t)       ((t) & T_ITALIC)
  27 #define T_ATOMIDX(t)    ((((t) >> 4) & 15) - 1)
  28
  29 #define T_EOF           0x0000          /* parser-specific */
  30 #define T_SPACE         0x0001
  31 #define T_TAB           0x0002
  32 #define T_KEYWORD       0x0003
  33 #define T_ORD           0x0010          /* ordinary */
  34 #define T_LETTER        0x0011
  35 #define T_NUMBER        0x0012
  36 #define T_STRING        0x0013
  37 #define T_GAP           0x0014
  38 #define T_BIGOP         0x0020          /* big operators */
  39 #define T_BINOP         0x0030          /* binary operators */
  40 #define T_RELOP         0x0040          /* relational symbol */
  41 #define T_LEFT          0x0050          /* opening token */
  42 #define T_RIGHT         0x0060          /* closing token */
  43 #define T_PUNC          0x0070          /* punctuation symbol */
  44 #define T_INNER         0x0080          /* like fractions */
  45
  46 #define T_ITALIC        0x0100          /* atom with italic font */
  47
  48 /* spaces in hundredths of em */
  49 #define S_S1            e_thinspace     /* thin space */
  50 #define S_S2            e_mediumspace   /* medium space */
  51 #define S_S3            e_thickspace    /* thick space */
  52
  53 /* reading input */
  54 int in_next(void);
  55 void in_back(int c);
  56 void in_define(char *name, char *def);
  57 int in_expand(char *name, char **args);
  58 int in_macrocall(char *name);
  59 int in_arg(int i);
  60 int in_top(void);
  61 int in_lineget(void);
  62 void in_lineset(int n);
  63 void in_done(void);
  64
  65 /* tokenizer */
  66 int tok_eqn(void);
  67 void tok_eqnout(char *s);
  68 char *tok_get(void);
  69 char *tok_pop(void);
  70 char *tok_poptext(int sep);
  71 int tok_jmp(char *kwd);
  72 int tok_type(void);
  73 int tok_sep(int soft);
  74 void tok_delim(void);
  75 void tok_macro(void);
  76 int tok_inline(void);
  77
  78 /* default definitions and operators */
  79 int def_type(char *s);
  80 void def_typeput(char *s, int type);
  81 void def_pieces(char *sign, char **top, char **mid, char **bot, char **cen);
  82 void def_sizes(char *sign, char *sizes[]);
  83 int def_brcost(int type);
  84 void def_piecesput(char *sign, char *top, char *mid, char *bot, char *cen);
  85 void def_sizesput(char *sign, char *sizes[]);
  86 void def_brcostput(int type, int cost);
  87 extern char *def_macros[][2];
  88
  89 /* variable length string buffer */
  90 struct sbuf {
  91         char *s;                /* allocated buffer */
  92         int sz;                 /* buffer size */
  93         int n;                  /* length of the string stored in s */
  94 };
  95
  96 void sbuf_init(struct sbuf *sbuf);
  97 void sbuf_done(struct sbuf *sbuf);
  98 char *sbuf_buf(struct sbuf *sbuf);
  99 void sbuf_add(struct sbuf *sbuf, int c);
 100 void sbuf_append(struct sbuf *sbuf, char *s);
 101 void sbuf_printf(struct sbuf *sbuf, char *s, ...);
 102 void sbuf_cut(struct sbuf *sbuf, int n);
 103 int sbuf_len(struct sbuf *sbuf);
 104 int sbuf_empty(struct sbuf *sbuf);
 105
 106 /* tex styles */
 107 #define TS_D            0x00
 108 #define TS_D0           0x01
 109 #define TS_T            0x02
 110 #define TS_T0           0x03
 111 #define TS_S            0x10
 112 #define TS_S0           0x11
 113 #define TS_SS           0x20
 114 #define TS_SS0          0x21
 115
 116 #define TS_MK(s, p)     (((s) << 4) | (p))
 117 #define TS_0(s)         ((s) & 0x01)    /* primed variant */
 118 #define TS_MK0(s)       ((s) | 0x01)    /* make style primed */
 119 #define TS_SZ(s)        ((s) >> 4)      /* character size */
 120 #define TS_DX(s)        ((s) == TS_D || (s) == TS_D0)
 121 #define TS_TXT(s)       ((s) & 0x02)    /* text style */
 122
 123 int ts_sup(int style);
 124 int ts_sub(int style);
 125 int ts_denom(int style);
 126 int ts_num(int style);
 127
 128 /* equations */
 129 struct box {
 130         struct sbuf raw;        /* the contents */
 131         int szreg, szown;       /* number register holding box size */
 132         int reg;                /* register holding the contents */
 133         int atoms;              /* the number of atoms inserted */
 134         int tbeg, tcur;         /* type of the first and the last atoms */
 135         int style;              /* tex style (TS_*) */
 136         char *tomark;           /* register for saving box width */
 137 };
 138
 139 struct box *box_alloc(int szreg, int at_pre, int style);
 140 void box_free(struct box *box);
 141 void box_puttext(struct box *box, int type, char *s, ...);
 142 void box_putf(struct box *box, char *s, ...);
 143 int box_size(struct box *box, char *val);
 144 void box_merge(struct box *box, struct box *sub, int breakable);
 145 void box_sub(struct box *box, struct box *sub, struct box *sup);
 146 void box_from(struct box *box, struct box *lim, struct box *llim, struct box *ulim);
 147 void box_over(struct box *box, struct box *num, struct box *denom);
 148 void box_sqrt(struct box *box, struct box *sub);
 149 void box_bar(struct box *box);
 150 void box_under(struct box *box);
 151 void box_accent(struct box *box, char *c);
 152 void box_wrap(struct box *box, struct box *sub, char *left, char *right);
 153 void box_move(struct box *box, int dy, int dx);
 154 void box_gap(struct box *box, int n);
 155 char *box_buf(struct box *box);
 156 char *box_toreg(struct box *box);
 157 void box_vertspace(struct box *box);
 158 int box_empty(struct box *box);
 159 void box_markpos(struct box *box, char *regname);
 160 void box_vcenter(struct box *box, struct box *sub);
 161 void box_pile(struct box *box, struct box **pile, int adj, int rowspace);
 162 void box_matrix(struct box *box, int ncols, struct box *cols[][NPILES],
 163                 int *adj, int colspace, int rowspace);
 164
 165 /* managing registers */
 166 char *escarg(char *arg);
 167 int sregmk(void);
 168 void sregrm(int id);
 169 int nregmk(void);
 170 void nregrm(int id);
 171 char *nreg(int id);
 172 char *sreg(int id);
 173 char *nregname(int id);
 174 char *sregname(int id);
 175 void reg_reset(void);
 176
 177 /* eqn global variables */
 178 extern int e_axisheight;
 179 extern int e_minimumsize;
 180 extern int e_overhang;
 181 extern int e_nulldelim;
 182 extern int e_scriptspace;
 183 extern int e_thinspace;
 184 extern int e_mediumspace;
 185 extern int e_thickspace;
 186 extern int e_num1;
 187 extern int e_num2;
 188 extern int e_denom1;
 189 extern int e_denom2;
 190 extern int e_sup1;
 191 extern int e_sup2;
 192 extern int e_sup3;
 193 extern int e_sub1;
 194 extern int e_sub2;
 195 extern int e_supdrop;
 196 extern int e_subdrop;
 197 extern int e_xheight;
 198 extern int e_rulethickness;
 199 extern int e_bigopspacing1;
 200 extern int e_bigopspacing2;
 201 extern int e_bigopspacing3;
 202 extern int e_bigopspacing4;
 203 extern int e_bigopspacing5;
 204 extern int e_columnsep;
 205 extern int e_baselinesep;
 206 extern int e_bodyheight;
 207 extern int e_bodydepth;
 208 void def_set(char *name, int val);