renaming token types to be consistent

pascal.l

@@ -90,11 +90,11 @@ Z [zZ]
 
 [0-9]+ {
     yylval.literal_integer = new LiteralInteger(Utils::string_to<int>(yytext), line_number);
-    return TOKEN_DIGIT_SEQUENCE;
+    return TOKEN_LITERAL_INTEGER;
 }
 [0-9]+\.[0-9]+ {
     yylval.literal_real = new LiteralReal(Utils::string_to<float>(yytext), line_number);
-    return TOKEN_REAL;
+    return TOKEN_LITERAL_REAL;
 }
 
 "'" {
@@ -111,7 +111,7 @@ Z [zZ]
         }
     }
     yylval.literal_string = new LiteralString(yytext, line_number);
-    return TOKEN_STRING;
+    return TOKEN_LITERAL_STRING;
 }
 
 {T}{R}{U}{E} {

pascal.y

@@ -62,9 +62,9 @@ Program * main_program;
 %token KEYWORD_VAR
 %token KEYWORD_WHILE
 
-%token <literal_integer> TOKEN_DIGIT_SEQUENCE
-%token <literal_real> TOKEN_REAL
-%token <literal_string> TOKEN_STRING
+%token <literal_integer> TOKEN_LITERAL_INTEGER
+%token <literal_real> TOKEN_LITERAL_REAL
+%token <literal_string> TOKEN_LITERAL_STRING
 %token <literal_boolean> TOKEN_LITERAL_BOOLEAN
 %token <identifier> TOKEN_IDENTIFIER
 
@@ -204,7 +204,7 @@ type_denoter : array_type {
     $$ = new TypeDenoter(TypeDenoter::BOOLEAN);
 };
 
-array_type : KEYWORD_ARRAY KEYWORD_LEFT_BRACKET TOKEN_DIGIT_SEQUENCE KEYWORD_DOT_DOT TOKEN_DIGIT_SEQUENCE KEYWORD_RIGHT_BRACKET KEYWORD_OF type_denoter {
+array_type : KEYWORD_ARRAY KEYWORD_LEFT_BRACKET TOKEN_LITERAL_INTEGER KEYWORD_DOT_DOT TOKEN_LITERAL_INTEGER KEYWORD_RIGHT_BRACKET KEYWORD_OF type_denoter {
     $$ = new ArrayType($3, $5, $8);
 };
 
@@ -370,11 +370,11 @@ sign : KEYWORD_PLUS {
     $$ = -1;
 };
 
-primary_expression : TOKEN_DIGIT_SEQUENCE {
+primary_expression : TOKEN_LITERAL_INTEGER {
     $$ = new PrimaryExpression($1);
-} | TOKEN_REAL {
+} | TOKEN_LITERAL_REAL {
     $$ = new PrimaryExpression($1);
-} | TOKEN_STRING {
+} | TOKEN_LITERAL_STRING {
     $$ = new PrimaryExpression($1);
 } | TOKEN_LITERAL_BOOLEAN {
     $$ = new PrimaryExpression($1);