wip parser structure with placeholders

Makefile

@@ -97,7 +97,7 @@ $(NAME): $(OBJS)
 
 run: $(NAME)
 	@echo $(YELLOW)"run"$(RESET)
-	@./$(NAME) "3.4 * x^2 + 1 * x^1 - 2 * x^0 = 5.123 * x^1"
+	@./$(NAME) "3.4 * x^2 + 1 * x^1 - 2.0 * x^0 = 5.123 * x^1"
 
 clean:
 	$(RM_OBJS)

headers/parser.h

@@ -4,22 +4,37 @@
 #include "libft.h"
 #include "lexer.h"
 #include "errors.h"
+#include <stdbool.h>
 
 typedef enum
 {
     TERM_LEFT,  // a in "a = b"
     TERM_RIGHT, // b in "a = b"
-} term_type;
+} term_position;
+
+typedef enum
+{
+    TERM_PLUS,  // +
+    TERM_MINUS, // -
+} term_sign;
+
+typedef enum
+{
+    TYPE_INT,    // "123"
+    TYPE_DOUBLE, // "123.456"
+} coefficient_type;
 
 typedef struct
 {
-    term_type type;
+    term_position position;
+    term_sign sign;
+    coefficient_type coefficient_type;
     union
     {
-        char value_char;
-        int value_int;
-        double value_double;
+        int coefficient_int;
+        double coefficient_double;
     };
+    int exponent;
 } term;
 
 int parse(token *tokens, term *terms);

src/computorv1.c

@@ -97,7 +97,7 @@ int main(int ac, char **av)
         }
         else if (tokens[i].type == TOKEN_NUMBER_DOUBLE)
         {
-            printf("%f\n", tokens[i].value_double);
+            printf("%g\n", tokens[i].value_double);
         }
         else
         {

src/parser.c

@@ -1,10 +1,109 @@
 #include "parser.h"
 
+/**
+    TOKEN_VARIABLE,      // x, y, etc.
+    TOKEN_NUMBER_INT,    // int
+    TOKEN_NUMBER_DOUBLE, // double
+    TOKEN_POWER,         // ^ or **
+    TOKEN_SIGN,          // + or -
+    TOKEN_FACTOR,        // * or /
+    TOKEN_EQUAL,         // =
+    TOKEN_END            // null (end of input)
+
+    1. VARIABLE | NUMBER_INT | NUMBER_DOUBLE | POWER | SIGN | FACTOR | EQUAL | END
+    2. VARIABLE | NUMBER_INT | NUMBER_DOUBLE | POWER | SIGN | FACTOR | EQUAL | END
+    3. VARIABLE | NUMBER_INT | NUMBER_DOUBLE | POWER | SIGN | FACTOR | EQUAL | END
+
+    term_position position;
+    term_sign sign;
+    coefficient_type coefficient_type;
+    union
+    {
+        int coefficient_int;
+        double coefficient_double;
+    };
+    int exponent;
+ */
+
+static term_sign get_sign(token *tokens, int *token_count)
+{
+    if (tokens)           // placeholder
+        *token_count = 1; // placeholder
+    return '+';           // placeholder
+}
+
+static void get_coefficient(token *tokens, int *token_count, coefficient_type *coefficient_type, int *coefficient_int, double *coefficient_double)
+{
+    if (tokens && coefficient_type && coefficient_double && coefficient_int) // placeholder
+        *token_count = 1;                                                    // placeholder
+}
+
+static int get_exponent(token *tokens, int *token_count)
+{
+    if (tokens)           // placeholder
+        *token_count = 1; // placeholder
+    return 1;             // placeholder
+}
+
 int parse(token *tokens, term *terms)
 {
+    /*
     if (tokens)
     {
-        terms[0].type = 0;
+        terms[0].exponent = 0;
     }
     return 1;
+    */
+
+    int i;
+    int term_count;
+    int token_count;
+    int coefficient_int;
+    double coefficient_double;
+    term_position term_position;
+    coefficient_type coefficient_type;
+
+    term_count = 0;
+    token_count = 0;
+    i = 0;
+    term_position = TERM_LEFT;
+    while (tokens[i].type != TOKEN_END)
+    {
+        coefficient_int = 0;
+        coefficient_double = 0.0;
+
+        if (tokens[i].type == TOKEN_EQUAL)
+        {
+            term_position = TERM_RIGHT;
+            i++;
+            break;
+        }
+
+        // position
+        terms[term_count].position = term_position;
+
+        // sign
+        terms[term_count].sign = get_sign(&tokens[i], &token_count);
+        i += token_count;
+
+        // coefficient
+        get_coefficient(&tokens[i], &token_count, &coefficient_type, &coefficient_int, &coefficient_double);
+        if (coefficient_type == TYPE_INT)
+        {
+            terms[term_count].coefficient_int = coefficient_int;
+        }
+        else if (coefficient_type == TYPE_DOUBLE)
+        {
+            terms[term_count].coefficient_double = coefficient_double;
+        }
+        i += token_count;
+
+        // exponent
+        terms[term_count].exponent = get_exponent(&tokens[i], &token_count);
+        i += token_count;
+
+        i++;
+    }
+
+    return term_count;
 }