diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..b0ac6ad
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,12 @@
+default : parser
+
+parser : parser.c
+	gcc -o parser.exe parser.c
+
+
+parser.c : main.py
+	chmod +x main.py
+	python3 main.py > parser.c
+	
+clean : 
+	rm -f parser.c parser.exe
diff --git a/grammar.txt b/grammar.txt
new file mode 100644
index 0000000..8191ca8
--- /dev/null
+++ b/grammar.txt
@@ -0,0 +1,9 @@
+S : a S b
+S : int
+S : " string "
+S : { Assoc }
+Assoc : KeyVal AssocBis
+Assoc : 
+AssocBis : , KeyVal AssocBis
+AssocBis :
+KeyVal : id = S
\ No newline at end of file
diff --git a/main.py b/main.py
old mode 100644
new mode 100755
index 198b495..f15cf93
--- a/main.py
+++ b/main.py
@@ -162,5 +162,5 @@ int parse_{code}(char* word, int pos) {{
 
 
 if __name__ == '__main__':
-    with open("sample.txt", "r") as f:
+    with open("grammar.txt", "r") as f:
         parse(f.readlines())
diff --git a/parser.c b/parser.c
new file mode 100644
index 0000000..41fa6a8
--- /dev/null
+++ b/parser.c
@@ -0,0 +1,474 @@
+#include <stdio.h>
+#include <string.h>
+
+void print_with_indent(int indent, char * string) {
+    printf("%*s%s", indent, "", string);
+}
+
+int parse_S(char* word, int pos);
+int parse_Assoc(char* word, int pos);
+int parse_AssocBis(char* word, int pos);
+int parse_KeyVal(char* word, int pos);
+
+// ---- Functions to parse terminals ----
+int parse_string(char* word, int pos) {
+    // Extract the next 6 chars of the word
+    char substr[7];
+    substr[0] = '\0';
+    strncat(substr, &word[pos], 6);
+    
+    // Compare this extracted string to the terminal, 
+    // and check if the next char is a space or the end of the string
+    if (strcmp(substr, "string") == 0 && (word[pos+6] == ' ' || word[pos+6] == '\0')) {
+        print_with_indent(pos, "string\n");
+        return 7;
+    } else {
+        return -1;
+    }
+}
+
+int parse_a(char* word, int pos) {
+    // Extract the next 1 chars of the word
+    char substr[2];
+    substr[0] = '\0';
+    strncat(substr, &word[pos], 1);
+    
+    // Compare this extracted string to the terminal, 
+    // and check if the next char is a space or the end of the string
+    if (strcmp(substr, "a") == 0 && (word[pos+1] == ' ' || word[pos+1] == '\0')) {
+        print_with_indent(pos, "a\n");
+        return 2;
+    } else {
+        return -1;
+    }
+}
+
+int parse_44(char* word, int pos) {
+    // Extract the next 1 chars of the word
+    char substr[2];
+    substr[0] = '\0';
+    strncat(substr, &word[pos], 1);
+    
+    // Compare this extracted string to the terminal, 
+    // and check if the next char is a space or the end of the string
+    if (strcmp(substr, ",") == 0 && (word[pos+1] == ' ' || word[pos+1] == '\0')) {
+        print_with_indent(pos, ",\n");
+        return 2;
+    } else {
+        return -1;
+    }
+}
+
+int parse_b(char* word, int pos) {
+    // Extract the next 1 chars of the word
+    char substr[2];
+    substr[0] = '\0';
+    strncat(substr, &word[pos], 1);
+    
+    // Compare this extracted string to the terminal, 
+    // and check if the next char is a space or the end of the string
+    if (strcmp(substr, "b") == 0 && (word[pos+1] == ' ' || word[pos+1] == '\0')) {
+        print_with_indent(pos, "b\n");
+        return 2;
+    } else {
+        return -1;
+    }
+}
+
+int parse_125(char* word, int pos) {
+    // Extract the next 1 chars of the word
+    char substr[2];
+    substr[0] = '\0';
+    strncat(substr, &word[pos], 1);
+    
+    // Compare this extracted string to the terminal, 
+    // and check if the next char is a space or the end of the string
+    if (strcmp(substr, "}") == 0 && (word[pos+1] == ' ' || word[pos+1] == '\0')) {
+        print_with_indent(pos, "}\n");
+        return 2;
+    } else {
+        return -1;
+    }
+}
+
+int parse_id(char* word, int pos) {
+    // Extract the next 2 chars of the word
+    char substr[3];
+    substr[0] = '\0';
+    strncat(substr, &word[pos], 2);
+    
+    // Compare this extracted string to the terminal, 
+    // and check if the next char is a space or the end of the string
+    if (strcmp(substr, "id") == 0 && (word[pos+2] == ' ' || word[pos+2] == '\0')) {
+        print_with_indent(pos, "id\n");
+        return 3;
+    } else {
+        return -1;
+    }
+}
+
+int parse_123(char* word, int pos) {
+    // Extract the next 1 chars of the word
+    char substr[2];
+    substr[0] = '\0';
+    strncat(substr, &word[pos], 1);
+    
+    // Compare this extracted string to the terminal, 
+    // and check if the next char is a space or the end of the string
+    if (strcmp(substr, "{") == 0 && (word[pos+1] == ' ' || word[pos+1] == '\0')) {
+        print_with_indent(pos, "{\n");
+        return 2;
+    } else {
+        return -1;
+    }
+}
+
+int parse_34(char* word, int pos) {
+    // Extract the next 1 chars of the word
+    char substr[2];
+    substr[0] = '\0';
+    strncat(substr, &word[pos], 1);
+    
+    // Compare this extracted string to the terminal, 
+    // and check if the next char is a space or the end of the string
+    if (strcmp(substr, "\"") == 0 && (word[pos+1] == ' ' || word[pos+1] == '\0')) {
+        print_with_indent(pos, "\"\n");
+        return 2;
+    } else {
+        return -1;
+    }
+}
+
+int parse_int(char* word, int pos) {
+    // Extract the next 3 chars of the word
+    char substr[4];
+    substr[0] = '\0';
+    strncat(substr, &word[pos], 3);
+    
+    // Compare this extracted string to the terminal, 
+    // and check if the next char is a space or the end of the string
+    if (strcmp(substr, "int") == 0 && (word[pos+3] == ' ' || word[pos+3] == '\0')) {
+        print_with_indent(pos, "int\n");
+        return 4;
+    } else {
+        return -1;
+    }
+}
+
+int parse_61(char* word, int pos) {
+    // Extract the next 1 chars of the word
+    char substr[2];
+    substr[0] = '\0';
+    strncat(substr, &word[pos], 1);
+    
+    // Compare this extracted string to the terminal, 
+    // and check if the next char is a space or the end of the string
+    if (strcmp(substr, "=") == 0 && (word[pos+1] == ' ' || word[pos+1] == '\0')) {
+        print_with_indent(pos, "=\n");
+        return 2;
+    } else {
+        return -1;
+    }
+}
+
+// ---- Functions to parse a non-terminal according to a rule ----
+int parse_S1(char* word, int pos) {
+    int totalCharParsed = 0;
+    int nbCharParsed;
+    printf("Entering S1\n");
+
+    nbCharParsed = parse_a(word, pos + totalCharParsed);
+    if (nbCharParsed == -1) {
+        printf("Fail a in S1\n");
+        return -1;    
+    }
+    totalCharParsed += nbCharParsed;
+
+    nbCharParsed = parse_S(word, pos + totalCharParsed);
+    if (nbCharParsed == -1) {
+        printf("Fail S in S1\n");
+        return -1;    
+    }
+    totalCharParsed += nbCharParsed;
+
+    nbCharParsed = parse_b(word, pos + totalCharParsed);
+    if (nbCharParsed == -1) {
+        printf("Fail b in S1\n");
+        return -1;    
+    }
+    totalCharParsed += nbCharParsed;
+
+    printf("Success S1\n");
+    return totalCharParsed;
+}
+
+int parse_S2(char* word, int pos) {
+    int totalCharParsed = 0;
+    int nbCharParsed;
+    printf("Entering S2\n");
+
+    nbCharParsed = parse_int(word, pos + totalCharParsed);
+    if (nbCharParsed == -1) {
+        printf("Fail int in S2\n");
+        return -1;    
+    }
+    totalCharParsed += nbCharParsed;
+
+    printf("Success S2\n");
+    return totalCharParsed;
+}
+
+int parse_S3(char* word, int pos) {
+    int totalCharParsed = 0;
+    int nbCharParsed;
+    printf("Entering S3\n");
+
+    nbCharParsed = parse_34(word, pos + totalCharParsed);
+    if (nbCharParsed == -1) {
+        printf("Fail 34 in S3\n");
+        return -1;    
+    }
+    totalCharParsed += nbCharParsed;
+
+    nbCharParsed = parse_string(word, pos + totalCharParsed);
+    if (nbCharParsed == -1) {
+        printf("Fail string in S3\n");
+        return -1;    
+    }
+    totalCharParsed += nbCharParsed;
+
+    nbCharParsed = parse_34(word, pos + totalCharParsed);
+    if (nbCharParsed == -1) {
+        printf("Fail 34 in S3\n");
+        return -1;    
+    }
+    totalCharParsed += nbCharParsed;
+
+    printf("Success S3\n");
+    return totalCharParsed;
+}
+
+int parse_S4(char* word, int pos) {
+    int totalCharParsed = 0;
+    int nbCharParsed;
+    printf("Entering S4\n");
+
+    nbCharParsed = parse_123(word, pos + totalCharParsed);
+    if (nbCharParsed == -1) {
+        printf("Fail 123 in S4\n");
+        return -1;    
+    }
+    totalCharParsed += nbCharParsed;
+
+    nbCharParsed = parse_Assoc(word, pos + totalCharParsed);
+    if (nbCharParsed == -1) {
+        printf("Fail Assoc in S4\n");
+        return -1;    
+    }
+    totalCharParsed += nbCharParsed;
+
+    nbCharParsed = parse_125(word, pos + totalCharParsed);
+    if (nbCharParsed == -1) {
+        printf("Fail 125 in S4\n");
+        return -1;    
+    }
+    totalCharParsed += nbCharParsed;
+
+    printf("Success S4\n");
+    return totalCharParsed;
+}
+
+int parse_Assoc1(char* word, int pos) {
+    int totalCharParsed = 0;
+    int nbCharParsed;
+    printf("Entering Assoc1\n");
+
+    nbCharParsed = parse_KeyVal(word, pos + totalCharParsed);
+    if (nbCharParsed == -1) {
+        printf("Fail KeyVal in Assoc1\n");
+        return -1;    
+    }
+    totalCharParsed += nbCharParsed;
+
+    nbCharParsed = parse_AssocBis(word, pos + totalCharParsed);
+    if (nbCharParsed == -1) {
+        printf("Fail AssocBis in Assoc1\n");
+        return -1;    
+    }
+    totalCharParsed += nbCharParsed;
+
+    printf("Success Assoc1\n");
+    return totalCharParsed;
+}
+
+int parse_Assoc2(char* word, int pos) {
+    int totalCharParsed = 0;
+    int nbCharParsed;
+    printf("Entering Assoc2\n");
+
+    printf("Epsilon! -> Success\n");
+
+    printf("Success Assoc2\n");
+    return totalCharParsed;
+}
+
+int parse_AssocBis1(char* word, int pos) {
+    int totalCharParsed = 0;
+    int nbCharParsed;
+    printf("Entering AssocBis1\n");
+
+    nbCharParsed = parse_44(word, pos + totalCharParsed);
+    if (nbCharParsed == -1) {
+        printf("Fail 44 in AssocBis1\n");
+        return -1;    
+    }
+    totalCharParsed += nbCharParsed;
+
+    nbCharParsed = parse_KeyVal(word, pos + totalCharParsed);
+    if (nbCharParsed == -1) {
+        printf("Fail KeyVal in AssocBis1\n");
+        return -1;    
+    }
+    totalCharParsed += nbCharParsed;
+
+    nbCharParsed = parse_AssocBis(word, pos + totalCharParsed);
+    if (nbCharParsed == -1) {
+        printf("Fail AssocBis in AssocBis1\n");
+        return -1;    
+    }
+    totalCharParsed += nbCharParsed;
+
+    printf("Success AssocBis1\n");
+    return totalCharParsed;
+}
+
+int parse_AssocBis2(char* word, int pos) {
+    int totalCharParsed = 0;
+    int nbCharParsed;
+    printf("Entering AssocBis2\n");
+
+    printf("Epsilon! -> Success\n");
+
+    printf("Success AssocBis2\n");
+    return totalCharParsed;
+}
+
+int parse_KeyVal1(char* word, int pos) {
+    int totalCharParsed = 0;
+    int nbCharParsed;
+    printf("Entering KeyVal1\n");
+
+    nbCharParsed = parse_id(word, pos + totalCharParsed);
+    if (nbCharParsed == -1) {
+        printf("Fail id in KeyVal1\n");
+        return -1;    
+    }
+    totalCharParsed += nbCharParsed;
+
+    nbCharParsed = parse_61(word, pos + totalCharParsed);
+    if (nbCharParsed == -1) {
+        printf("Fail 61 in KeyVal1\n");
+        return -1;    
+    }
+    totalCharParsed += nbCharParsed;
+
+    nbCharParsed = parse_S(word, pos + totalCharParsed);
+    if (nbCharParsed == -1) {
+        printf("Fail S in KeyVal1\n");
+        return -1;    
+    }
+    totalCharParsed += nbCharParsed;
+
+    printf("Success KeyVal1\n");
+    return totalCharParsed;
+}
+
+// ---- Functions to parse a non-terminal by testing all rules ----
+int parse_S(char* word, int pos) {
+    int nbCharParsed;
+    printf("Entering S\n");
+
+    nbCharParsed = parse_S1(word, pos);
+    if (nbCharParsed != -1) {
+        return nbCharParsed;    
+    }
+
+    nbCharParsed = parse_S2(word, pos);
+    if (nbCharParsed != -1) {
+        return nbCharParsed;    
+    }
+
+    nbCharParsed = parse_S3(word, pos);
+    if (nbCharParsed != -1) {
+        return nbCharParsed;    
+    }
+
+    nbCharParsed = parse_S4(word, pos);
+    if (nbCharParsed != -1) {
+        return nbCharParsed;    
+    }
+
+    return -1;
+}
+
+int parse_Assoc(char* word, int pos) {
+    int nbCharParsed;
+    printf("Entering Assoc\n");
+
+    nbCharParsed = parse_Assoc1(word, pos);
+    if (nbCharParsed != -1) {
+        return nbCharParsed;    
+    }
+
+    nbCharParsed = parse_Assoc2(word, pos);
+    if (nbCharParsed != -1) {
+        return nbCharParsed;    
+    }
+
+    return -1;
+}
+
+int parse_AssocBis(char* word, int pos) {
+    int nbCharParsed;
+    printf("Entering AssocBis\n");
+
+    nbCharParsed = parse_AssocBis1(word, pos);
+    if (nbCharParsed != -1) {
+        return nbCharParsed;    
+    }
+
+    nbCharParsed = parse_AssocBis2(word, pos);
+    if (nbCharParsed != -1) {
+        return nbCharParsed;    
+    }
+
+    return -1;
+}
+
+int parse_KeyVal(char* word, int pos) {
+    int nbCharParsed;
+    printf("Entering KeyVal\n");
+
+    nbCharParsed = parse_KeyVal1(word, pos);
+    if (nbCharParsed != -1) {
+        return nbCharParsed;    
+    }
+
+    return -1;
+}
+
+int main(int argc, char* argv[]) {
+    char* word;
+    if (argc >= 2)
+        word = argv[1];
+    else
+        word = "";
+    int value = parse_S(word, 0);
+    printf("%d\n", value);
+    if (value == strlen(word) + 1) {
+        printf("OK\n");
+    } else {
+        printf("KO\n");
+    }
+}
+