From 1ef148f6f3fc515866be7abdbd5a844a45cb4f49 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?John=20Ankarstr=C3=B6m?= <john@ankarstrom.se>
Date: Tue, 20 Jul 2021 01:32:48 +0200
Subject: Add refs.lex

---
 Makefile  |  3 ++
 example.t | 26 +++++++++++++++++
 refs.lex  | 98 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 127 insertions(+)
 create mode 100644 Makefile
 create mode 100644 example.t
 create mode 100644 refs.lex

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..c226ef4
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,3 @@
+refs: refs.lex
+	lex refs.lex
+	cc -O2 -o refs lex.yy.c -lfl
diff --git a/example.t b/example.t
new file mode 100644
index 0000000..de0f5f5
--- /dev/null
+++ b/example.t
@@ -0,0 +1,26 @@
+.SH
+References
+.XP
+%au	В. А. Богородицкий
+%al	Bogorodickij
+%da	1887
+%ti	Курс грамматики русского языка. Часть 1-ая: Фонетика
+%ci	Варшава
+%pu	Типография Михаила Земкевича
+.XP
+%au	J. Baudouin de Courtenay
+%da	1972
+%ti	The Difference between Phonetics and Psychophonetics
+%bo	A Baudouin de Courtenay Anthology
+%ed	T. A. Sebeok et al.
+%tr	Edward Stankiewicz
+%ci	Bloomington
+%pu	Indiana University Press
+.XP
+%au	M. E. Lesk
+%ti	Some Applications of Inverted Indexes on the UNIX System
+%bo	UNIX Programmer's Manual
+%vo	2b
+%pu	Bell Laboratories
+%ci	Murray Hill, NJ
+%da	1978
diff --git a/refs.lex b/refs.lex
new file mode 100644
index 0000000..714a79e
--- /dev/null
+++ b/refs.lex
@@ -0,0 +1,98 @@
+	#include <err.h>
+	#include <stdarg.h>
+
+	#define MAX 255
+	#define ED "red."
+	#define TR "Övers."
+
+	void field(char *);
+	void entry(void);
+	int pf(char *, ...);
+
+	char *name;
+
+	struct entry {
+		char au[MAX]; char al[MAX];
+		char bo[MAX]; char ci[MAX];
+		char da[MAX]; char ed[MAX];
+		char jo[MAX]; char no[MAX];
+		char pg[MAX]; char pu[MAX];
+		char se[MAX]; char ti[MAX];
+		char tr[MAX]; char vo[MAX];
+	} e;
+
+%s ENTRY
+%%
+^%.*\n		field(yytext); BEGIN(ENTRY);
+<ENTRY>^[^%]	entry(); ECHO; BEGIN(0);
+<ENTRY><<EOF>>	entry(); yyterminate();
+%%
+
+void
+main(int argc, char *argv[0])
+{
+	name = argv[0];
+	yylex();
+}
+
+void
+field(char *t)
+{
+
+#define AS(a,b) if(strncmp(t, a, 2) == 0 && (t += 3)){ strcpy(b, t); return; }
+
+	t++;
+	t[strcspn(t, "\n")] = 0;
+
+	AS("au",e.au); AS("al",e.al);
+	AS("bo",e.bo); AS("ci",e.ci);
+	AS("da",e.da); AS("ed",e.ed);
+	AS("jo",e.jo); AS("no",e.no);
+	AS("pg",e.pg); AS("pu",e.pu);
+	AS("se",e.se); AS("ti",e.ti);
+	AS("tr",e.tr); AS("vo",e.vo);
+
+	fprintf(stderr, "%s: unrecognized field %%%.2s\n", name, t);
+	exit(1);
+}
+
+void
+entry()
+{
+	(pf("% (%).\n", e.au, e.da) || pf("%.\n", e.au));
+	(pf("%.\n\\fI%\\fP.\n", e.ti, e.bo ? e.bo : e.jo)
+	|| pf("%.\n", e.ti));
+	(pf("%: %.\n", e.ci, e.pu) || pf("%.\n", e.pu));
+}
+
+int
+pf(char *fmt, ...)
+{
+	char *buf, *p;
+	int n;
+	va_list ap;
+
+	n = 0;
+	for(p = fmt; *p; p++)
+		if(*p == '%')
+			n++;
+
+	if(!(buf = malloc(strlen(fmt)+n*MAX+1)))
+		err(1, "malloc");
+
+	va_start(ap, fmt);
+	for(; *fmt; fmt++)
+		switch(*fmt){
+		case '%':
+			p = va_arg(ap, char *);
+			if(!p || !p[0])
+				return 0;
+			strcat(buf, p);
+			break;
+		default:
+			strncat(buf, fmt, 1);
+		}
+	printf("%s", buf);
+	va_end(ap);
+	return 1;
+}
-- 
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