From c42a1d3d6168df56f966ea1f3ba3ef39ebbff4e4 Mon Sep 17 00:00:00 2001
From: rsc <devnull@localhost>
Date: Tue, 21 Feb 2006 18:37:05 +0000
Subject: add

---
 src/cmd/htmlroff/roff.c | 750 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 750 insertions(+)
 create mode 100644 src/cmd/htmlroff/roff.c

(limited to 'src/cmd/htmlroff/roff.c')

diff --git a/src/cmd/htmlroff/roff.c b/src/cmd/htmlroff/roff.c
new file mode 100644
index 00000000..6a7cd09e
--- /dev/null
+++ b/src/cmd/htmlroff/roff.c
@@ -0,0 +1,750 @@
+#include "a.h"
+
+enum
+{
+	MAXREQ = 100,
+	MAXRAW = 40,
+	MAXESC = 60,
+	MAXLINE = 1024,
+	MAXIF = 20,
+	MAXARG = 10,
+};
+
+typedef struct Esc Esc;
+typedef struct Req Req;
+typedef struct Raw Raw;
+
+/* escape sequence handler, like for \c */
+struct Esc
+{
+	Rune r;
+	int (*f)(void);
+	int mode;
+};
+
+/* raw request handler, like for .ie */
+struct Raw
+{
+	Rune *name;
+	void (*f)(Rune*);
+};
+
+/* regular request handler, like for .ft */
+struct Req
+{
+	int argc;
+	Rune *name;
+	void (*f)(int, Rune**);
+};
+
+int		dot = '.';
+int		tick = '\'';
+int		backslash = '\\';
+
+int		inputmode;
+Req		req[MAXREQ];
+int		nreq;
+Raw		raw[MAXRAW];
+int		nraw;
+Esc		esc[MAXESC];
+int		nesc;
+int		iftrue[MAXIF];
+int		niftrue;
+
+int isoutput;
+int linepos;
+
+
+void
+addraw(Rune *name, void (*f)(Rune*))
+{
+	Raw *r;
+	
+	if(nraw >= nelem(raw)){
+		fprint(2, "too many raw requets\n");
+		return;
+	}
+	r = &raw[nraw++];
+	r->name = erunestrdup(name);
+	r->f = f;
+}
+
+void
+delraw(Rune *name)
+{
+	int i;
+	
+	for(i=0; i<nraw; i++){
+		if(runestrcmp(raw[i].name, name) == 0){
+			if(i != --nraw){
+				free(raw[i].name);
+				raw[i] = raw[nraw];
+			}
+			return;
+		}
+	}
+}
+
+void
+renraw(Rune *from, Rune *to)
+{
+	int i;
+	
+	delraw(to);
+	for(i=0; i<nraw; i++)
+		if(runestrcmp(raw[i].name, from) == 0){
+			free(raw[i].name);
+			raw[i].name = erunestrdup(to);
+			return;
+		}
+}
+
+
+void
+addreq(Rune *s, void (*f)(int, Rune**), int argc)
+{
+	Req *r;
+
+	if(nreq >= nelem(req)){
+		fprint(2, "too many requests\n");
+		return;
+	}
+	r = &req[nreq++];
+	r->name = erunestrdup(s);
+	r->f = f;
+	r->argc = argc;
+}
+
+void
+delreq(Rune *name)
+{
+	int i;
+
+	for(i=0; i<nreq; i++){
+		if(runestrcmp(req[i].name, name) == 0){
+			if(i != --nreq){
+				free(req[i].name);
+				req[i] = req[nreq];
+			}
+			return;
+		}
+	}
+}
+
+void
+renreq(Rune *from, Rune *to)
+{
+	int i;
+	
+	delreq(to);
+	for(i=0; i<nreq; i++)
+		if(runestrcmp(req[i].name, from) == 0){
+			free(req[i].name);
+			req[i].name = erunestrdup(to);
+			return;
+		}
+}
+
+void
+addesc(Rune r, int (*f)(void), int mode)
+{
+	Esc *e;
+	
+	if(nesc >= nelem(esc)){
+		fprint(2, "too many escapes\n");
+		return;
+	}
+	e = &esc[nesc++];
+	e->r = r;
+	e->f = f;
+	e->mode = mode;
+}
+
+/*
+ * Get the next logical character in the input stream.
+ */
+int
+getnext(void)
+{
+	int i, r;
+
+next:
+	r = getrune();
+	if(r < 0)
+		return -1;
+	if(r == Uformatted){
+		br();
+		assert(!isoutput);
+		while((r = getrune()) >= 0 && r != Uunformatted){
+			if(r == Uformatted)
+				continue;
+			outrune(r);
+		}
+		goto next;
+	}
+	if(r == Uunformatted)
+		goto next;
+	if(r == backslash){
+		r = getrune();
+		if(r < 0)
+			return -1;
+		for(i=0; i<nesc; i++){
+			if(r == esc[i].r && (inputmode&esc[i].mode)==inputmode){
+				if(esc[i].f == e_warn)
+					warn("ignoring %C%C", backslash, r);
+				r = esc[i].f();
+				if(r <= 0)
+					goto next;
+				return r;
+			}
+		}
+		if(inputmode&(ArgMode|CopyMode)){
+			ungetrune(r);
+			r = backslash;
+		}
+	}
+	return r;
+}
+
+void
+ungetnext(Rune r)
+{
+	/*
+	 * really we want to undo the getrunes that led us here,
+	 * since the call after ungetnext might be getrune!
+	 */
+	ungetrune(r);
+}
+
+int
+_readx(Rune *p, int n, int nmode, int line)
+{
+	int c, omode;
+	Rune *e;
+
+	while((c = getrune()) == ' ' || c == '\t')
+		;
+	ungetrune(c);
+	omode = inputmode;
+	inputmode = nmode;
+	e = p+n-1;
+	for(c=getnext(); p<e; c=getnext()){
+		if(c < 0)
+			break;
+		if(!line && (c == ' ' || c == '\t'))
+			break;
+		if(c == '\n'){
+			if(!line)
+				ungetnext(c);
+			break;
+		}
+		*p++ = c;
+	}
+	inputmode = omode;
+	*p = 0;
+	if(c < 0)
+		return -1;
+	return 0;
+}
+
+/*
+ * Get the next argument from the current line.
+ */
+Rune*
+copyarg(void)
+{
+	static Rune buf[MaxLine];
+	int c;
+	Rune *r;
+	
+	if(_readx(buf, sizeof buf, ArgMode, 0) < 0)
+		return nil;
+	r = runestrstr(buf, L("\\\""));
+	if(r){
+		*r = 0;
+		while((c = getrune()) >= 0 && c != '\n')
+			;
+		ungetrune('\n');
+	}
+	r = erunestrdup(buf);	
+	return r;
+}
+
+/*
+ * Read the current line in given mode.  Newline not kept.
+ * Uses different buffer from copyarg!
+ */
+Rune*
+readline(int m)
+{
+	static Rune buf[MaxLine];
+	Rune *r;
+
+	if(_readx(buf, sizeof buf, m, 1) < 0)
+		return nil;
+	r = erunestrdup(buf);
+	return r;
+}
+
+/*
+ * Given the argument line (already read in copy+arg mode),
+ * parse into arguments.  Note that \" has been left in place
+ * during copy+arg mode parsing, so comments still need to be stripped.
+ */
+int
+parseargs(Rune *p, Rune **argv)
+{
+	int argc;
+	Rune *w;
+
+	for(argc=0; argc<MAXARG; argc++){
+		while(*p == ' ' || *p == '\t')
+			p++;
+		if(*p == 0)
+			break;
+		argv[argc] = p;
+		if(*p == '"'){
+			/* quoted argument */
+			if(*(p+1) == '"'){
+				/* empty argument */
+				*p = 0;
+				p += 2;
+			}else{
+				/* parse quoted string */
+				w = p++;
+				for(; *p; p++){
+					if(*p == '"' && *(p+1) == '"')
+						*w++ = '"';
+					else if(*p == '"'){
+						p++;
+						break;
+					}else
+						*w++ = *p;
+				}
+				*w = 0;
+			}	
+		}else{
+			/* unquoted argument - need to watch out for \" comment */
+			for(; *p; p++){
+				if(*p == ' ' || *p == '\t'){
+					*p++ = 0;
+					break;
+				}
+				if(*p == '\\' && *(p+1) == '"'){
+					*p = 0;
+					if(p != argv[argc])
+						argc++;
+					return argc;
+				}
+			}
+		}
+	}
+	return argc;
+}
+
+/*
+ * Process a dot line.  The dot has been read.
+ */
+void
+dotline(int dot)
+{
+	int argc, i;
+	Rune *a, *argv[1+MAXARG];
+
+	/*
+	 * Read request/macro name
+	 */
+	a = copyarg();
+	if(a == nil || a[0] == 0){
+		free(a);
+		getrune();	/* \n */
+		return;
+	}
+	argv[0] = a;
+	/*
+	 * Check for .if, .ie, and others with special parsing.
+	 */
+	for(i=0; i<nraw; i++){
+		if(runestrcmp(raw[i].name, a) == 0){
+			raw[i].f(raw[i].name);
+			free(a);
+			return;
+		}	
+	}
+
+	/*
+	 * Read rest of line in copy mode, invoke regular request.
+	 */
+	a = readline(ArgMode);
+	if(a == nil){
+		free(argv[0]);
+		return;
+	}
+	argc = 1+parseargs(a, argv+1);
+	for(i=0; i<nreq; i++){
+		if(runestrcmp(req[i].name, argv[0]) == 0){
+			if(req[i].argc != -1){
+				if(argc < 1+req[i].argc){
+					warn("not enough arguments for %C%S", dot, req[i].name);
+					free(argv[0]);
+					free(a);
+					return;
+				}
+				if(argc > 1+req[i].argc)
+					warn("too many arguments for %C%S", dot, req[i].name);
+			}
+			req[i].f(argc, argv);
+			free(argv[0]);
+			free(a);
+			return;
+		}
+	}
+
+	/*
+	 * Invoke user-defined macros.
+	 */
+	runmacro(dot, argc, argv);
+	free(argv[0]);
+	free(a);
+}
+
+/*
+ * newlines are magical in various ways.
+ */
+int bol;
+void
+newline(void)
+{
+	int n;
+
+	if(bol)
+		sp(eval(L("1v")));
+	bol = 1;
+	if((n=getnr(L(".ce"))) > 0){
+		nr(L(".ce"), n-1);
+		br();
+	}
+	if(getnr(L(".fi")) == 0)
+		br();
+	outrune('\n');
+}
+
+void
+startoutput(void)
+{
+	char *align;
+	double ps, vs, lm, rm, ti;
+	Rune buf[200];
+
+	if(isoutput)
+		return;
+	isoutput = 1;
+
+	if(getnr(L(".paragraph")) == 0)
+		return;
+
+	nr(L(".ns"), 0);
+	isoutput = 1;
+	ps = getnr(L(".s"));
+	if(ps <= 1)
+		ps = 10;
+	ps /= 72.0;
+	USED(ps);
+
+	vs = getnr(L(".v"))*getnr(L(".ls")) * 1.0/UPI;
+	vs /= (10.0/72.0);	/* ps */
+	if(vs == 0)
+		vs = 1.2;
+
+	lm = (getnr(L(".o"))+getnr(L(".i"))) * 1.0/UPI;
+	ti = getnr(L(".ti")) * 1.0/UPI;
+	nr(L(".ti"), 0);
+
+	rm = 8.0 - getnr(L(".l"))*1.0/UPI - getnr(L(".o"))*1.0/UPI;
+	if(rm < 0)
+		rm = 0;
+	switch(getnr(L(".j"))){
+	default:
+	case 0:
+		align = "left";
+		break;
+	case 1:
+		align = "justify";
+		break;
+	case 3:
+		align = "center";
+		break;
+	case 5:
+		align = "right";
+		break;
+	}
+	if(getnr(L(".ce")))
+		align = "center";
+	if(!getnr(L(".margin")))
+		runesnprint(buf, nelem(buf), "<p style=\"line-height: %.1fem; text-indent: %.2fin; margin-top: 0; margin-bottom: 0; text-align: %s;\">\n",
+			vs, ti, align);
+	else
+		runesnprint(buf, nelem(buf), "<p style=\"line-height: %.1fem; margin-left: %.2fin; text-indent: %.2fin; margin-right: %.2fin; margin-top: 0; margin-bottom: 0; text-align: %s;\">\n",
+			vs, lm, ti, rm, align);
+	outhtml(buf);
+}
+void
+br(void)
+{
+	if(!isoutput)
+		return;
+	isoutput = 0;
+
+	nr(L(".dv"), 0);
+	dv(0);
+	hideihtml();
+	if(getnr(L(".paragraph")))
+		outhtml(L("</p>"));
+}
+
+void
+r_margin(int argc, Rune **argv)
+{
+	USED(argc);
+
+	nr(L(".margin"), eval(argv[1]));
+}
+
+int inrequest;
+void
+runinput(void)
+{
+	int c;
+	
+	bol = 1;
+	for(;;){
+		c = getnext();
+		if(c < 0)
+			break;
+		if((c == dot || c == tick) && bol){
+			inrequest = 1;
+			dotline(c);
+			bol = 1;
+			inrequest = 0;
+		}else if(c == '\n'){
+			newline();
+			itrap();
+			linepos = 0;
+		}else{
+			outtrap();
+			startoutput();
+			showihtml();
+			if(c == '\t'){
+				/* XXX do better */
+				outrune(' ');
+				while(++linepos%4)
+					outrune(' ');
+			}else{
+				outrune(c);
+				linepos++;
+			}
+			bol = 0;
+		}
+	}
+}
+
+void
+run(void)
+{
+	t1init();
+	t2init();
+	t3init();
+	t4init();
+	t5init();
+	t6init();
+	t7init();
+	t8init();
+	/* t9init(); t9.c */
+	t10init();
+	t11init();
+	/* t12init(); t12.c */
+	t13init();
+	t14init();
+	t15init();
+	t16init();
+	t17init();
+	t18init();
+	t19init();
+	t20init();
+	htmlinit();
+	hideihtml();
+	
+	addreq(L("margin"), r_margin, 1);
+	nr(L(".margin"), 1);
+	nr(L(".paragraph"), 1);
+
+	runinput();
+	while(popinput())
+		;
+	dot = '.';
+	if(verbose)
+		fprint(2, "eof\n");
+	runmacro1(L("eof"));
+	closehtml();
+}
+
+void
+out(Rune *s)
+{
+	if(s == nil)
+		return;
+	for(; *s; s++)
+		outrune(*s);
+}
+
+void (*outcb)(Rune);
+
+void
+inroman(Rune r)
+{
+	int f;
+	
+	f = getnr(L(".f"));
+	nr(L(".f"), 1);
+	runmacro1(L("font"));
+	outrune(r);
+	nr(L(".f"), f);
+	runmacro1(L("font"));
+}
+
+void
+Brune(Rune r)
+{
+	if(r == '&')
+		Bprint(&bout, "&amp;");
+	else if(r == '<')
+		Bprint(&bout, "&lt;");
+	else if(r == '>')
+		Bprint(&bout, "&gt;");
+	else if(r < Runeself || utf8)
+		Bprint(&bout, "%C", r);
+	else
+		Bprint(&bout, "%S", rune2html(r));
+}
+
+void
+outhtml(Rune *s)
+{
+	Rune r;
+	
+	for(; *s; s++){
+		switch(r = *s){
+		case '<':
+			r = Ult;
+			break;
+		case '>':
+			r = Ugt;
+			break;
+		case '&':
+			r = Uamp;
+			break;
+		case ' ':
+			r = Uspace;
+			break;
+		}
+		outrune(r);
+	}
+}
+
+void
+outrune(Rune r)
+{
+	switch(r){
+	case ' ':
+		if(getnr(L(".fi")) == 0)
+			r = Unbsp;
+		break;
+	case Uformatted:
+	case Uunformatted:
+		abort();
+	}
+	if(outcb){
+		if(r == ' ')
+			r = Uspace;
+		outcb(r);
+		return;
+	}
+	/* writing to bout */
+	switch(r){
+	case Uempty:
+		return;
+	case Upl:
+		inroman('+');
+		return;
+	case Ueq:
+		inroman('=');
+		return;
+	case Umi:
+		inroman(0x2212);
+		return;
+	case Utick:
+		r = '\'';
+		break;
+	case Ubtick:
+		r = '`';
+		break;
+	case Uminus:
+		r = '-';
+		break;
+	case '\'':
+		Bprint(&bout, "&rsquo;");
+		return;
+	case '`':
+		Bprint(&bout, "&lsquo;");
+		return;
+	case Uamp:
+		Bputrune(&bout, '&');
+		return;
+	case Ult:
+		Bputrune(&bout, '<');
+		return;
+	case Ugt:
+		Bputrune(&bout, '>');
+		return;
+	case Uspace:
+		Bputrune(&bout, ' ');
+		return;
+	case 0x2032:
+		/*
+		 * In Firefox, at least, the prime is not
+		 * a superscript by default.
+		 */
+		Bprint(&bout, "<sup>");
+		Brune(r);
+		Bprint(&bout, "</sup>");
+		return;
+	}
+	Brune(r);
+}
+
+void
+r_nop(int argc, Rune **argv)
+{
+	USED(argc);
+	USED(argv);
+}
+
+void
+r_warn(int argc, Rune **argv)
+{
+	USED(argc);
+	warn("ignoring %C%S", dot, argv[0]);
+}
+
+int
+e_warn(void)
+{
+	/* dispatch loop prints a warning for us */
+	return 0;
+}
+
+int
+e_nop(void)
+{
+	return 0;
+}
-- 
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