README.md

@@ -1,3 +1,16 @@
 # SCL: Simple Calculator Language
 
-A rewrite of halk.
+Project structure:
+
+```bash
+$ tree -d
+.
+├── build       # Build directory; where binaries (except the main one) go.
+│   ├── obj     # Project objects.
+│   └── test    # Test build directory.
+│       └── obj # Test objects.
+├── src         # Source files (*.c).
+│   └── include # Header files (*.h)
+└── test        # Tests (file names match those in src/*.c).
+    └── unity   # Unity test framework files.
+```

src/include/lexer.h

@@ -8,20 +8,20 @@
 
 // What the lexer is currently looking at.
 typedef enum {
-    LEXER_STATE_CONFUSED, // Can't decide what it's looking at (also initial
-                          // state).
-    LEXER_STATE_NUM,      // Looking at a number.
-    LEXER_STATE_CALL,     // Looking at a call.
+  LEXER_STATE_CONFUSED, // Can't decide what it's looking at (also initial
+                        // state).
+  LEXER_STATE_NUM,      // Looking at a number.
+  LEXER_STATE_CALL,     // Looking at a call.
 } LexerState;
 
 // Lexer: converts text to tokens.
 typedef struct {
-    char* src;        // The source text.
-    size_t srcl;      // The number of source chars.
-    char* cchar;      // The current character.
-    Token** tokens;   // The tokens produced.
-    size_t ntokens;   // The number of tokens.
-    LexerState state; // What the lexer is looking at.
+    char* src;          // The source text.
+    size_t srcl;        // The number of source chars.
+    char* cchar;        // The current character.
+    Token** tokens;     // The tokens produced.
+    size_t ntokens;     // The number of tokens.
+    LexerState state;   // What the lexxer is looking at.
 } Lexer;
 
 // Create a lexer.
@@ -42,7 +42,4 @@ void lexer_do_call(Lexer* lexer);
 // Convert text to tokens.
 void lexer_lex(Lexer* lexer);
 
-// Add a token to the lexer.
-void lexer_add_token(Lexer* lexer, Token* token);
-
 #endif

src/include/parser.h

@@ -10,4 +10,21 @@
 // - Expression 1
 // - Expression 2
 
+typedef enum OpType {
+    OPTYPE_PLUS,
+    OPTYPE_MINUS
+} optype_t;
+
+typedef union Exp {
+    typedef struct Op {
+        optype_t type;
+        Exp* exp1;
+        Exp* exp2;
+    } op_t;
+
+    int n;
+} exp_t;
+
+
+
 #endif

src/include/token.h

@@ -9,7 +9,7 @@ typedef enum {
 // Token.
 typedef struct {
     TokenType type; // The type of the Token.
-    char* val;      // The text of the Token.
+    char* val;      // The text of the Token.        
 } Token;
 
 Token* token_init(TokenType type, char* val);

src/include/util.c

@@ -0,0 +1,12 @@
+#ifndef UTIL_H
+#define UTIL_H
+
+// Utilies.
+
+#include <stdlib.h>
+#include <stdio.h>
+
+// Exit with an error. Returns int for ease of use, but should be treated as void.
+int die(char* msg);
+
+#endif

src/lexer.c

@@ -1,6 +1,4 @@
 #include "include/lexer.h"
-#include "include/token.h"
-#include <stdlib.h>
 
 Lexer* lexer_init(char* src) {
     Lexer* lexer = malloc(sizeof(Lexer));
@@ -22,15 +20,7 @@ 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_do_confused(Lexer* lexer) {}
 
 void lexer_lex(Lexer* lexer) {
     while (*lexer->cchar) {
@@ -42,8 +32,3 @@ 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;
-}

src/util.c

@@ -1,3 +1,6 @@
 #include "include/util.h"
 
-int is_even(int n) { return !(n % 2); }
+int is_even(int n) {
+    return !(n%2);
+}
+

test/main.c

@@ -1,5 +1,5 @@
-#include "registry.h"
 #include "unity/unity.h"
+#include "registry.h"
 
 void (*tests[30])();
 

test/registry.c

@@ -1,5 +1,5 @@
-#include "registry.h"
 #include "unity/unity_internals.h"
+#include "registry.h"
 
 #define TESTS_MAX 128
 
@@ -7,14 +7,13 @@ static Test tests[TESTS_MAX];
 static int test_count = 0;
 
 void register_test(Test t) {
-    if (test_count < TESTS_MAX) {
-        tests[test_count] = t;
-        test_count++;
-    } else printf("Maximum number of tests (%d) exceeded.\n", TESTS_MAX);
+  if (test_count < TESTS_MAX) {
+      tests[test_count] = t;
+      test_count++;
+  } else
+    printf("Maximum number of tests (%d) exceeded.\n", TESTS_MAX);
 }
 
 void run_all_tests() {
-    for (int i = 0; i < test_count; i++) {
-        int res = tests[i]();
-    }
+  for (int i = 0; i < test_count; i++) tests[i]();
 }

test/registry.h

@@ -2,12 +2,12 @@
 #define REGISTRY_H
 
 #include <stdio.h>
-#include "unity/unity.h"
 
-typedef int (*Test)(void);
+// Test functions neither consume nor return anything.
+typedef void (*Test)(void);
 
 // Register a new test function.
-void register_test(Test);
+void register_test(Test t);
 
 // Run all registered tests.
 void run_all_tests();

test/token.c

@@ -1,19 +1,31 @@
-#include "unity/unity.h"
 #include <stdlib.h>
+#include "unity/unity.h"
 
-#include "../src/include/token.h"
 #include "registry.h"
+#include "unity/unity_internals.h"
+#include "../src/include/token.h"
 
-int test_token_init() {
-    UNITY_BEGIN();
+void test_token_init() {
     char* s = malloc(sizeof("Hello, world!"));
     s = "Hello, world!";
     Token* t = token_init(TOKEN_TYPE_CALL, s);
     TEST_ASSERT_EQUAL(TOKEN_TYPE_CALL, t->type);
     TEST_ASSERT_EQUAL_STRING("Hello, world!", t->val);
-    return UNITY_END();
+}
+
+void test_token_destroy() {
+    char* s = malloc(1 * sizeof(char));
+    *s = 'h';
+    Token* t = token_init(TOKEN_TYPE_CALL, s);
+    token_destroy(t);
+}
+
+void token_test() {
+    UNITY_BEGIN();
+    RUN_TEST(test_token_init);
+    UNITY_END();
 }
 
 __attribute__((constructor)) void register_tests_token() {
-    register_test(test_token_init);
+    register_test(token_test);
 }

test/util.c

@@ -1,14 +1,19 @@
-#include "../src/include/util.h"
-#include "registry.h"
 #include "unity/unity.h"
+#include "registry.h"
+#include "unity/unity_internals.h"
+#include "../src/include/util.h"
 
-int test_is_even() {
-    UNITY_BEGIN();
+void test_is_even() {
     TEST_ASSERT_EQUAL(0, is_even(1));
     TEST_ASSERT_EQUAL(1, is_even(2));
-    return UNITY_END();
+}
+
+void util_test() {
+    UNITY_BEGIN();
+    RUN_TEST(test_is_even);
+    UNITY_END();
 }
 
 __attribute__((constructor)) void register_tests_util() {
-    register_test(test_is_even);
+    register_test(util_test);
 }