From 2a20043edb282dff05c9832b1576bf8894dd6473 Mon Sep 17 00:00:00 2001
From: Alessandro Iezzi <aiezzi@alessandroiezzi.it>
Date: Mon, 22 Jul 2024 17:19:33 +0200
Subject: Add a first draft of the parser

---
 .gitignore   |  2 ++
 Makefile     | 11 +++++++++--
 properties.l |  6 +-----
 properties.y | 22 ++++++++++++++++++++++
 4 files changed, 34 insertions(+), 7 deletions(-)
 create mode 100644 properties.y

diff --git a/.gitignore b/.gitignore
index 6be102b..61cf493 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,5 @@ properties
 *.core
 a.out
 *-lexer.c
+y.*
+*-parser.*
\ No newline at end of file
diff --git a/Makefile b/Makefile
index 85e0bb8..de0f79f 100644
--- a/Makefile
+++ b/Makefile
@@ -3,10 +3,10 @@ LEX  = lex
 YACC = yacc
 CC   = cc
 
-OBJ = properties-lexer.o
+OBJ = properties-parser.o properties-lexer.o
 
 CFLAGS = -DVERSION=${VER}
-LFLAGS = -ll
+LFLAGS = -ll -ly
 
 
 all: properties
@@ -17,6 +17,12 @@ properties-lexer.o: properties.l
 	@mv lex.yy.c properties-lexer.c
 	${CC} ${CFLAGS} -c properties-lexer.c
 
+properties-parser.o properties-parser.h: properties.y
+	${YACC} -d properties.y
+	@mv y.tab.c properties-parser.c
+	@mv y.tab.h properties-parser.h
+	${CC} ${CFLAGS} -c properties-parser.c
+
 properties: ${OBJ}
 	${CC} ${OBJ} -o $@ ${LFLAGS}
 
@@ -24,3 +30,4 @@ clean:
 	@rm -f ${OBJ} *.core a.out
 	@rm -f properties-lexer.c lex.*
 	@rm -f properties
+	@rm -f properties-parser.* y.*
diff --git a/properties.l b/properties.l
index 653c358..73803fc 100644
--- a/properties.l
+++ b/properties.l
@@ -1,9 +1,5 @@
 %{
-enum {
-	KEY = 1,
-	DIV,
-	VALUE
-};
+#include "properties-parser.h"
 %}
 
 %%
diff --git a/properties.y b/properties.y
new file mode 100644
index 0000000..69d683d
--- /dev/null
+++ b/properties.y
@@ -0,0 +1,22 @@
+%{
+
+#include <stdio.h>
+#include <stdlib.h>
+
+%}
+
+%token KEY DIV VALUE
+
+%%
+
+value: VALUE
+	| VALUE value
+	;
+
+%%
+
+void
+yyerror(char *s)
+{
+    fprintf(stderr, "%s\n", s);
+}
-- 
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