From 031bb53552b5b2675b1c3afb57a27b28cb5d379e Mon Sep 17 00:00:00 2001
From: Alessandro Iezzi <aiezzi@alessandroiezzi.it>
Date: Wed, 24 Jul 2024 11:19:52 +0200
Subject: Add grammar rules to parse the value of a property

In the lexer, I've done a string duplication, 'cause the value
wasn't transfered to the parser.

The VALUE token keep a single character, so, in the parser I need
to concatenate every single character to a string.
---
 properties.l |  4 ++--
 properties.y | 30 ++++++++++++++++++++++++++++--
 2 files changed, 30 insertions(+), 4 deletions(-)

diff --git a/properties.l b/properties.l
index 67a5c2a..eb6ff81 100644
--- a/properties.l
+++ b/properties.l
@@ -5,8 +5,8 @@
 %%
 
 =|:                    return DIV;
-^[ \t]*[a-zA-Z0-9\.]*  return KEY;
+^[ \t]*[a-zA-Z0-9\.]*  yylval.value = strdup(yytext); return KEY;
 [ \t]*                 ;
-.                      return VALUE;
+.                      yylval.value = strdup(yytext); return VALUE;
 
 %%
diff --git a/properties.y b/properties.y
index 69d683d..a765c8a 100644
--- a/properties.y
+++ b/properties.y
@@ -2,19 +2,45 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 
 %}
 
 %token KEY DIV VALUE
 
+%union
+{
+	char *value;
+}
+
 %%
 
-value: VALUE
-	| VALUE value
+value: VALUE {
+			$$.value = calloc(2, sizeof(char));
+			strcat($$.value, $1.value);
+		}
+	| value VALUE {
+			char *s = strdup($$.value);
+			$$.value = calloc(strlen(s) + strlen($2.value) + 1, sizeof(char));
+			strcat($$.value, s);
+			strcat($$.value, $2.value);
+		}
 	;
 
 %%
 
+extern FILE *yyin;
+
+int
+main(void)
+{
+	do {
+		yyparse();
+	} while(!feof(yyin));
+
+	return EXIT_SUCCESS;
+}
+
 void
 yyerror(char *s)
 {
-- 
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