Changed things.

src/include/lexer.h

@@ -3,9 +3,13 @@
 
 #include <stdlib.h>
 #include <string.h>
+#include <stdio.h>
 
 #include "token.h"
 
+#define TOKENS_MAX 32
+#define ZERO_CHAR 30
+
 // What the lexer is currently looking at.
 typedef enum {
     LEXER_STATE_CONFUSED, // Can't decide what it's looking at (also initial
@@ -30,6 +34,9 @@ Lexer* lexer_init(char* src);
 // Destroy a lexer.
 void lexer_destroy(Lexer* lexer);
 
+// Convert text to tokens.
+void lexer_lex(Lexer* lexer);
+
 // Lex in confused mode.
 void lexer_do_confused(Lexer* lexer);
 
@@ -39,10 +46,15 @@ void lexer_do_number(Lexer* lexer);
 // Lex in call mode.
 void lexer_do_call(Lexer* lexer);
 
-// Convert text to tokens.
-void lexer_lex(Lexer* lexer);
+// Increment the lexer's current character pointer.
+void lexer_inc(Lexer* lexer);
 
 // Add a token to the lexer.
 void lexer_add_token(Lexer* lexer, Token* token);
 
+// Print the contents of a lexer.
+void lexer_print(Lexer* lexer);
+
+static char* lexer_state_str(Lexer* lexer);
+
 #endif

src/include/token.h

@@ -1,6 +1,9 @@
 #ifndef TOKEN_H
 #define TOKEN_H
 
+#include <stdlib.h>
+#include <stdio.h>
+
 typedef enum {
     TOKEN_TYPE_CALL,
     TOKEN_TYPE_NUMBER,
@@ -10,9 +13,13 @@ typedef enum {
 typedef struct {
     TokenType type; // The type of the Token.
     char* val;      // The text of the Token.
+    size_t len;     // Length of the text of the Token.
 } Token;
 
 Token* token_init(TokenType type, char* val);
 void token_destroy(Token* token);
 
+void token_print(Token* token);
+static char* token_type_str(Token* token);
+
 #endif

src/lexer.c

@@ -1,6 +1,9 @@
 #include "include/lexer.h"
 #include "include/token.h"
+#include <assert.h>
 #include <stdlib.h>
+#include <ctype.h>
+#include <string.h>
 
 Lexer* lexer_init(char* src) {
     Lexer* lexer = malloc(sizeof(Lexer));
@@ -9,7 +12,7 @@ Lexer* lexer_init(char* src) {
     lexer->srcl = strlen(src);
     lexer->cchar = lexer->src;
 
-    lexer->tokens = NULL;
+    lexer->tokens = calloc(TOKENS_MAX, sizeof(Token));
     lexer->ntokens = 0;
     lexer->state = LEXER_STATE_CONFUSED;
 
@@ -22,16 +25,6 @@ void lexer_destroy(Lexer* lexer) {
     for (int i = 0; i < lexer->ntokens; token_destroy(lexer->tokens[i++]));
 }
 
-void lexer_do_confused(Lexer* lexer) {
-    int c = atoi(lexer->cchar);
-
-    if (c) lexer_add_token(lexer, token_init(TOKEN_TYPE_NUMBER, lexer->cchar));
-    else lexer_add_token(lexer, token_init(TOKEN_TYPE_CALL, lexer->cchar));
-}
-
-void lexer_do_number(Lexer* lexer) {}
-void lexer_do_call(Lexer* lexer) {}
-
 void lexer_lex(Lexer* lexer) {
     while (*lexer->cchar) {
         switch (lexer->state) {
@@ -43,7 +36,74 @@ void lexer_lex(Lexer* lexer) {
     }
 }
 
-void lexer_add_token(Lexer* lexer, Token* token) {
-    (void)reallocarray(lexer->tokens, lexer->ntokens++, sizeof(Token));
-    lexer->tokens[lexer->ntokens-1] = token;
+void lexer_do_confused(Lexer* lexer) {
+    if (isdigit(*lexer->cchar)) lexer_do_number(lexer);
+    else lexer_do_call(lexer);
+}
+
+void lexer_do_number(Lexer* lexer) {
+    // Size of the number string.
+    size_t numsz;
+
+    // Where the number string starts.
+    char* start = lexer->cchar;
+
+    for (numsz = 0; *lexer->cchar && isdigit(*lexer->cchar); numsz++)
+        lexer_inc(lexer);
+
+    char* num = malloc(numsz + 1);
+    memcpy(num, start, numsz);
+    num[numsz] = '\0';
+
+    lexer_add_token(lexer, token_init(TOKEN_TYPE_NUMBER, num));
+}
+
+void lexer_do_call(Lexer* lexer) {
+    // Size of the call string.
+    size_t callsz;
+
+    // Where the call string starts.
+    char* start = lexer->cchar;
+
+    for(callsz = 0; *lexer->cchar && isalpha(*lexer->cchar); callsz++)
+        lexer_inc(lexer);
+
+    char* call = malloc(callsz + 1);
+    memcpy(call, start, callsz);
+    call[callsz] = '\0';
+}
+
+void lexer_inc(Lexer* lexer) {
+    lexer->cchar += sizeof(char);
+}
+
+void lexer_add_token(Lexer* lexer, Token* token) {
+    assert(lexer->ntokens < TOKENS_MAX);
+
+    if (lexer->ntokens < TOKENS_MAX - 1) {
+        lexer->tokens[lexer->ntokens - 1] = token;
+        lexer->ntokens++;
+    }
+}
+
+void lexer_print(Lexer* lexer) {
+    printf("Lexer @%p:\n", lexer);
+    printf("\tsrc: \"%s\"\n", lexer->src);
+    printf("\tsrcl: \"%ld\"\n", lexer->srcl);
+    printf("\tcchar: \"%s\"\n", lexer->cchar);
+    printf("\tntokens: %ld\n", lexer->ntokens);
+    printf("\ttokens: [START]\n");
+    for (int i = 0; i < lexer->ntokens; i++) token_print(lexer->tokens[i]);
+    printf("[END]\n");
+    printf("\tstate: %s\n", lexer_state_str(lexer));
+
+}
+
+static char* lexer_state_str(Lexer* lexer) {
+    switch (lexer->state) {
+    case LEXER_STATE_NUM:      return "NUM";
+    case LEXER_STATE_CALL:     return "CALL";
+    case LEXER_STATE_CONFUSED: return "CONFUSED";
+    default:                   return "???";
+    }
 }

src/main.c

@@ -1,9 +1,14 @@
 #include <stdio.h>
 
 #include "include/util.h"
+#include "include/lexer.h"
 
 int main(int argc, char** argv) {
-    printf("2 is even: %s\n", is_even(2) ? "true" : "false");
-    printf("5 is even: %s\n", is_even(5) ? "true" : "false");
-    return 0;
+    char* text = malloc(5); 
+    text = "a1b2";
+
+    Lexer* lexer = lexer_init(text);
+    lexer_print(lexer);
+    lexer_lex(lexer);
+    lexer_print(lexer);
 }

src/token.c

@@ -1,5 +1,3 @@
-#include <stdlib.h>
-
 #include "include/token.h"
 
 Token* token_init(TokenType type, char* val) {
@@ -15,3 +13,18 @@ void token_destroy(Token* t) {
     free(t->val);
     free(t);
 }
+
+void token_print(Token* token) {
+    printf("Token @%p:\n", token);
+    printf("\ttype: %s\n", token_type_str(token));
+    printf("\tval: %s\n", token->val);
+    printf("\tlen: %ld\n", token->len);
+}
+
+static char* token_type_str(Token* token) {
+    switch (token->type) {
+    case TOKEN_TYPE_CALL:   return "CALL";
+    case TOKEN_TYPE_NUMBER: return "NUMBER";
+    default:                return "???";
+    }
+}

test/token.c

@@ -19,6 +19,6 @@ int test_token() {
     return UNITY_END();
 }
 
-__attribute__((constructor)) void register_tests_token() {
+__attribute__((constructor)) void register_token() {
     register_test(test_token);
 }