xref: /titanic_50/usr/src/cmd/eqn/text.c (revision b5cda42e4451eb63c27c9fb170e50e628aa89257)

/*
 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
/*	  All Rights Reserved  	*/

/*
 * Copyright (c) 1980 Regents of the University of California.
 * All rights reserved. The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 */

#pragma ident	"%Z%%M%	%I%	%E% SMI"

#include "e.h"
#include "e.def"
#include <locale.h>

int	csp;
int	psp;
#define	CSSIZE	400
char	cs[420];

int	lf, rf;	/* temporary spots for left and right fonts */

void name4(int, int);
void roman(int);
void shim(void);
int trans(int, char *);

void
text(int t, char *p1)
{
	int c;
	char *p;
	tbl *tp, *lookup();
	extern tbl *restbl[];

	yyval = oalloc();
	ebase[yyval] = 0;
#ifndef NEQN
	eht[yyval] = VERT(EM(1.0, EFFPS(ps)));	/* ht in machine units */
#else	/* NEQN */
	eht[yyval] = VERT(2);	/* 2 half-spaces */
#endif	/* NEQN */
	lfont[yyval] = rfont[yyval] = ROM;
	if (t == QTEXT)
		p = p1;
	else if (t == SPACE)
		p = "\\ ";
	else if (t == THIN)
		p = "\\|";
	else if (t == TAB)
		p = "\\t";
	else if ((tp = lookup(restbl, p1, NULL)) != NULL)
		p = tp->defn;
	else {
		lf = rf = 0;
		for (csp = psp = 0; (c = p1[psp++]) != '\0'; ) {
			rf = trans(c, p1);
			if (lf == 0)
				lf = rf;	/* save first */
			if (csp > CSSIZE)
				error(FATAL, gettext(
				    "converted token %.25s... too long"), p1);
		}
		cs[csp] = '\0';
		p = cs;
		lfont[yyval] = lf;
		rfont[yyval] = rf;
	}
	if (dbg)
		printf(".\t%dtext: S%d <- %s; b=%d,h=%d,lf=%c,rf=%c\n",
		    t, yyval, p, ebase[yyval], eht[yyval], lfont[yyval],
		    rfont[yyval]);
	printf(".ds %d \"%s\n", yyval, p);
}

int
trans(int c, char *p1)
{
	int f;
	f = ROM;
	switch (c) {
	case '0': case '1': case '2': case '3': case '4':
	case '5': case '6': case '7': case '8': case '9':
	case ':': case ';': case '!': case '%':
	case '(': case '[': case ')': case ']':
	case ',':
		if (rf == ITAL)
			shim();
		roman(c); break;
	case '.':
		if (rf == ROM)
			roman(c);
		else
			cs[csp++] = c;
		f = rf;
		break;
	case '|':
		if (rf == ITAL)
			shim();
		shim(); roman(c); shim(); break;
	case '=':
		if (rf == ITAL)
			shim();
		name4('e', 'q');
		break;
	case '+':
		if (rf == ITAL)
			shim();
		name4('p', 'l');
		break;
	case '>': case '<':
		if (rf == ITAL)
			shim();
		if (p1[psp] == '=') {	/* look ahead for == <= >= */
			name4(c, '=');
			psp++;
		} else {
			cs[csp++] = c;
		}
		break;
	case '-':
		if (rf == ITAL)
			shim();
		if (p1[psp] == '>') {
			name4('-', '>'); psp++;
		} else {
			name4('m', 'i');
		}
		break;
	case '/':
		if (rf == ITAL)
			shim();
		name4('s', 'l');
		break;
	case '~': case ' ':
		shim(); shim(); break;
	case '^':
		shim(); break;
	case '\\':	/* troff - pass 2 or 3 more chars */
		if (rf == ITAL)
			shim();
		cs[csp++] = c; cs[csp++] = c = p1[psp++]; cs[csp++] = p1[psp++];
		if (c == '(') cs[csp++] = p1[psp++];
		if (c == '*' && cs[csp-1] == '(') {
			cs[csp++] = p1[psp++];
			cs[csp++] = p1[psp++];
		}
		break;
	case '\'':
		cs[csp++] = '\\';
		cs[csp++] = 'f';
		cs[csp++] = rf == ITAL ? ITAL : ROM;
		name4('f', 'm');
		cs[csp++] = '\\'; cs[csp++] = 'f'; cs[csp++] = 'P';
		f = rf == ITAL ? ITAL : ROM;
		break;

	case 'f':
		if (ft == ITAL) {
			cs[csp++] = '\\'; cs[csp++] = '^';
			cs[csp++] = 'f';

			/* trying | instead of ^ */
			cs[csp++] = '\\'; cs[csp++] = '|';

			f = ITAL;
		}
		else
			cs[csp++] = 'f';
		break;
	case 'j':
		if (ft == ITAL) {
			cs[csp++] = '\\'; cs[csp++] = '^';
			cs[csp++] = 'j';
			f = ITAL;
		}
		else
			cs[csp++] = 'j';
		break;
	default:
		cs[csp++] = c;
		f = ft == ITAL ? ITAL : ROM;
		break;
	}
	return (f);
}

void
shim(void)
{
	cs[csp++] = '\\'; cs[csp++] = '|';
}

void
roman(int c)
{
	cs[csp++] = '\\'; cs[csp++] = 'f'; cs[csp++] = ROM;
	cs[csp++] = c;
	cs[csp++] = '\\'; cs[csp++] = 'f'; cs[csp++] = 'P';
}

void
name4(int c1, int c2)
{
	cs[csp++] = '\\';
	cs[csp++] = '(';
	cs[csp++] = c1;
	cs[csp++] = c2;
}