Fixed many minor things, tested it on main and is amazing, i think i need to start adding fractions next so further testing can be done with more powerful operators

CMakeLists.txt

@@ -19,7 +19,6 @@ include_directories(include)
 add_library(calculator_lib
     src/lexer.c
     src/parser.c
-    src/ast.c
     src/evaluator.c
 )
 

include/evaluator.h

@@ -0,0 +1,9 @@
+#ifndef EVALUATOR_H
+#define EVALUATOR_H
+
+#include "lexer.h"
+#include <stdint.h>
+
+int64_t evaluate(ASTNode *tree);
+
+#endif // !EVALUATOR_H

include/lexer.h

@@ -74,5 +74,6 @@ LexerErr tokenize_number(const char* input, size_t *offset, ASTNode *out);
 LexerErr string_to_integer(const char buf[], int64_t *number);
 bool isoperator(int c);
 Operator char_to_operator(int c);
+char operator_to_char(Operator op);
 
 #endif // !LEXER_H

include/parser.h

@@ -1,14 +1,29 @@
+#ifndef PARSER_H
+#define PARSER_H
+
 #include "lexer.h"
+#include <stdint.h>
 
 typedef struct {
     ASTNode *head;
 } AST;
 
-typedef enum {
-    PARSER_NUD, // Null Denotation
-    PARSER_LED, // Left Denotation
-} ParserState;
+typedef struct {
+    ASTNodeArray *arr;
+    size_t pos;
+} ASTNodeSlice;
 
-size_t node_lbp(Operator op);
-size_t node_rbp(Operator op);
-AST parse(ASTNodeArray arr);
+ASTNode ASTNodeSlice_peek(ASTNodeSlice *slice);
+ASTNode ASTNodeSlice_next(ASTNodeSlice *slice);
+bool ASTNodeSlice_is_valid(ASTNodeSlice *slice);
+
+ASTNode *nud(ASTNodeSlice *slice);
+ASTNode *led(ASTNodeSlice *slice, size_t right_precedence);
+
+uint8_t node_lbp(ASTNode node);
+uint8_t node_rbp(ASTNode node);
+
+AST parse(ASTNodeArray *arr);
+ASTNode *parse_expr(ASTNodeSlice *slice, uint8_t min_bp);
+
+#endif // !PARSER_H

src/evaluator.c

@@ -0,0 +1,22 @@
+#include "evaluator.h"
+#include "lexer.h"
+#include <stdint.h>
+
+int64_t evaluate(ASTNode *tree) {
+    if (tree->type == NODE_BINARY_OP) {
+        switch (tree->data.binary.op) {
+            case OP_ADD:
+                return evaluate(tree->data.binary.left) + evaluate(tree->data.binary.right);
+            case OP_SUB:
+                return evaluate(tree->data.binary.left) - evaluate(tree->data.binary.right);
+            case OP_MUL:
+                return evaluate(tree->data.binary.left) * evaluate(tree->data.binary.right);
+            case OP_DIV:
+                return evaluate(tree->data.binary.left) / evaluate(tree->data.binary.right);
+
+        }
+    } else {
+        return tree->data.integer;
+    }
+}
+

src/lexer.c

@@ -248,3 +248,16 @@ Operator char_to_operator(int c) {
             return -1;
     }
 }
+
+char operator_to_char(Operator op) {
+    switch (op) {
+        case OP_ADD:
+            return '+';
+        case OP_SUB:
+            return '-';
+        case OP_MUL:
+            return '*';
+        case OP_DIV:
+            return '/';
+    }
+}

src/main.c

@@ -1,7 +1,30 @@
+#include "evaluator.h"
+#include "lexer.h"
+#include "parser.h"
+#include <stdint.h>
+#include <inttypes.h>
 #include <stdlib.h>
 #include <stdio.h>
 
-int main(int argc, char *argv[]) {
-    puts("Hello");
+int main(void) {
+    char buf[256];
+    printf("Insert a valid mathematical expression: ");
+    
+    int c;
+    int pos = 0;
+    while ((c = getc(stdin)) != '\n' && c != EOF) {
+        buf[pos] = c;
+        pos++;
+    }
+    buf[pos] = '\0';
+
+    ASTNodeArray context;
+    tokenize(buf, &context);
+
+    AST tree = parse(&context);
+    int64_t result = evaluate(tree.head);
+
+
+    printf("El resultado es: %" PRIi64 "\n", result);
     return EXIT_SUCCESS;
 }

src/parser.c

@@ -1,9 +1,16 @@
 #include "parser.h"
 #include "lexer.h"
+#include <stdbool.h>
+#include <stdint.h>
 #include <stdlib.h>
+#include <stdio.h>
 
-size_t node_lbp(Operator op) {
-    switch (op) {
+uint8_t node_lbp(ASTNode node) {
+    if (node.type == NODE_INTEGER) {
+        return 0;
+    }
+
+    switch (node.data.binary.op) {
         case OP_ADD:
         case OP_SUB:
             return 10;
@@ -11,17 +18,91 @@ size_t node_lbp(Operator op) {
         case OP_DIV:
         case OP_MUL:
             return 20;
+        default:
+            return 0;
     }
 }
 
-size_t node_rbp(Operator op) {
-    switch (op) {
+uint8_t node_rbp(ASTNode node) {
+    if (node.type == NODE_INTEGER) {
+        return 0;
+    }
+
+    switch (node.data.binary.op) {
         case OP_ADD:
         case OP_SUB:
-            return 10;
+            return 11;
             break;
         case OP_DIV:
         case OP_MUL:
-            return 20;
+            return 21;
+        default:
+            return 0;
     }
 }
+
+ASTNode ASTNodeSlice_next(ASTNodeSlice *slice) {
+    return slice->arr->data[slice->pos++];
+}
+
+ASTNode ASTNodeSlice_peek(ASTNodeSlice *slice) {
+    return slice->arr->data[slice->pos];
+}
+
+bool ASTNodeSlice_is_valid(ASTNodeSlice *slice) {
+    if (slice->arr->len < 1) {
+        return false;
+    }
+    if (slice->pos >= slice->arr->len) {
+        return false;
+    }
+
+    return true;
+}
+
+AST parse(ASTNodeArray *arr) {
+    AST tree;
+    ASTNodeSlice context = {
+        .arr = arr,
+        .pos = 0,
+    };
+
+    tree.head = parse_expr(&context, 0);
+    return tree;
+}
+
+ASTNode *parse_expr(ASTNodeSlice *slice, uint8_t min_bp) {
+    ASTNode *left_side = malloc(sizeof(ASTNode));
+    *left_side = ASTNodeSlice_next(slice);
+
+    while (true) {
+        if (!ASTNodeSlice_is_valid(slice)) {
+            break;
+        }
+
+        ASTNode operator = ASTNodeSlice_peek(slice);
+        uint8_t rbp = node_rbp(operator);
+        uint8_t lbp = node_lbp(operator);
+
+        if (lbp < min_bp) {
+            break;
+        }
+
+        ASTNodeSlice_next(slice);
+        ASTNode *right_side = parse_expr(slice, rbp);
+
+        ASTNode *new_node = malloc(sizeof(ASTNode));
+        *new_node = operator;
+
+        new_node->data.binary.left = left_side;
+        new_node->data.binary.right = right_side;
+
+        left_side = new_node;
+    }
+
+
+    return left_side;
+}
+
+
+

test/CMakeLists.txt

@@ -2,6 +2,7 @@ find_package(cmocka REQUIRED)
 
 add_executable(test_nodeArray test_ASTNodeArray.c)
 add_executable(test_lexer test_lexer.c)
+add_executable(test_parser test_parser.c)
 
 target_link_libraries(test_nodeArray
     calculator_lib
@@ -13,5 +14,11 @@ target_link_libraries(test_lexer
     cmocka::cmocka
 )
 
+target_link_libraries(test_parser
+    calculator_lib
+    cmocka::cmocka
+)
+
 add_test(NAME nodeArray_tests COMMAND test_nodeArray)
 add_test(NAME lexer_tests COMMAND test_lexer)
+add_test(NAME parser_tests COMMAND test_parser)

test/test_evaluator.c

@@ -0,0 +1,32 @@
+#include "lexer.h"
+#include "parser.h"
+#include "evaluator.h"
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <setjmp.h>
+#include <cmocka.h>
+#include <stdlib.h>
+
+static void test_basic_evaluation(void** state) {
+    (void) state;
+
+    char expr[256] = "2 + 4 * 40 / 2";
+    ASTNodeArray context;
+
+    tokenize(expr, &context);
+    AST tree = parse(&context);
+    uint64_t value = evaluate(tree.head);
+
+    assert_int_equal(value, 82);
+}
+
+int main(void) {
+    const struct CMUnitTest tests[] = {
+        cmocka_unit_test(test_basic_evaluation),
+    };
+
+    cmocka_run_group_tests(tests, NULL, NULL);
+    return EXIT_SUCCESS;
+}

test/test_parser.c

@@ -1,5 +1,79 @@
-#include <stdlib.h>
+#include "lexer.h"
+#include "parser.h"
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <setjmp.h>
+#include <cmocka.h>
 
-int main() {
-    return EXIT_SUCCESS;
+static void test_parsing_basic_expression(void **state) {
+    (void) state;
+
+    char expr[256] = "2 + 3 / 66 * 789";
+    ASTNodeArray tokens;
+    ASTNode node;
+    
+    assert_int_equal(tokenize(expr, &tokens), LEXER_OK);
+    assert_int_equal(tokens.len, 7);
+
+    AST tree = parse(&tokens);
+    // Assert head is +
+    assert_int_equal(tree.head->type, NODE_BINARY_OP);
+    assert_int_equal(tree.head->data.binary.op, OP_ADD);
+
+    assert_int_equal(tree.head->data.binary.left->type, NODE_INTEGER);
+    assert_int_equal(tree.head->data.binary.left->data.integer, 2);
+
+
+    assert_int_equal(
+            tree.head->data.binary.right->type,
+            NODE_BINARY_OP
+            );
+    assert_int_equal(
+            tree.head->data.binary.right->data.binary.op, 
+            OP_MUL
+            );
+
+    assert_int_equal(
+            tree.head->data.binary.right->data.binary.right->type,
+            NODE_INTEGER);
+    assert_int_equal(
+            tree.head->data.binary.right->data.binary.right->data.integer,
+            789);
+
+    assert_int_equal(
+            tree.head->data.binary.right->data.binary.left->type, 
+            NODE_BINARY_OP
+            );
+    assert_int_equal(
+            tree.head->data.binary.right->data.binary.left->data.binary.op, 
+            OP_DIV
+            );
+
+    assert_int_equal(
+            tree.head->data.binary.right->data.binary.left->data.binary.right->type, 
+            NODE_INTEGER
+            );
+    assert_int_equal(
+            tree.head->data.binary.right->data.binary.left->data.binary.right->data.integer, 
+            66
+            );
+
+    assert_int_equal(
+            tree.head->data.binary.right->data.binary.left->data.binary.left->type, 
+            NODE_INTEGER
+            );
+    assert_int_equal(
+            tree.head->data.binary.right->data.binary.left->data.binary.left->data.integer, 
+            3
+            );
+}
+
+int main(void) {
+    const struct CMUnitTest tests [] = {
+        cmocka_unit_test(test_parsing_basic_expression),
+    };
+
+    return cmocka_run_group_tests(tests, NULL, NULL);
 }