/* $Id: out.h,v 1.34 2020/04/03 11:35:01 schwarze Exp $ */
/*
 * Copyright (c) 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
 * Copyright (c) 2014, 2017, 2018 Ingo Schwarze <schwarze@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 * Utilities for use by multiple mandoc(1) formatters.
 */

enum    roffscale {
        SCALE_CM, /* centimeters (c) */
        SCALE_IN, /* inches (i) */
        SCALE_PC, /* pica (P) */
        SCALE_PT, /* points (p) */
        SCALE_EM, /* ems (m) */
        SCALE_MM, /* mini-ems (M) */
        SCALE_EN, /* ens (n) */
        SCALE_BU, /* default horizontal (u) */
        SCALE_VS, /* default vertical (v) */
        SCALE_FS, /* syn. for u (f) */
        SCALE_MAX
};

struct  roffcol {
        size_t           width; /* width of cell */
        size_t           nwidth; /* max. width of number in cell */
        size_t           decimal; /* decimal position in cell */
        size_t           spacing; /* spacing after the column */
        int              flags; /* layout flags, see tbl_cell */
};

struct  roffsu {
        enum roffscale    unit;
        double            scale;
};

typedef size_t  (*tbl_sulen)(const struct roffsu *, void *);
typedef size_t  (*tbl_strlen)(const char *, void *);
typedef size_t  (*tbl_len)(size_t, void *);

struct  rofftbl {
        tbl_sulen        sulen; /* calculate scaling unit length */
        tbl_strlen       slen; /* calculate string length */
        tbl_len          len; /* produce width of empty space */
        struct roffcol  *cols; /* master column specifiers */
        void            *arg; /* passed to sulen, slen, and len */
};

#define SCALE_HS_INIT(p, v) \
        do { (p)->unit = SCALE_EN; \
             (p)->scale = (v); } \
        while (/* CONSTCOND */ 0)


struct  tbl_span;

const char       *a2roffsu(const char *, struct roffsu *, enum roffscale);
void              tblcalc(struct rofftbl *,
                        const struct tbl_span *, size_t, size_t);