add declaring and assignment with parser LHS support

src/parser/declaration/declaration.c

@@ -0,0 +1,30 @@
+#include "declaration.h"
+#include "../../lexer/token.h"
+#include "../../memory.h"
+#include "../parser.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+ParsedValue *parse_declaration(char *file, DArray *parsed, DArray *tokens,
+                              size_t *index) {
+  (*index)++;
+  error_if_finished(file, tokens, index);
+  Token *token = darray_get(tokens, *index);
+
+  ParsedValue * parsedValue = malloc(sizeof(ParsedValue));
+  ParsedDeclaration * declaration = malloc(sizeof(ParsedDeclaration));
+  parsedValue->data = declaration;
+  parsedValue->type = AST_DECLARATION;
+
+  if (token->type != TOKEN_IDENTIFIER) {
+    fprintf(stderr, "%s:%u:%u error: declaration requires an identifier\n",
+            file, token->line, token->column);
+    exit(EXIT_FAILURE);
+  }
+  declaration->name = strcpy(checked_malloc(sizeof(token->value)), token->value);
+  (*index)++;
+  if ((*index) >= tokens->size) return parsedValue;
+  token = darray_get(tokens, *index);
+  return parsedValue;
+}

src/parser/declaration/declaration.h

@@ -0,0 +1,16 @@
+#ifndef DECLARATION_H
+#define DECLARATION_H
+#include "../parser.h"
+#include "../../lexer/token.h"  // for Token
+
+typedef struct {
+  char * name;
+  bool is_function;
+  DArray args; // string[]
+  ParsedValue * from;
+} ParsedDeclaration;
+
+// Function declaration for parsing an identifier
+ParsedValue *parse_declaration(char *file, DArray *parsed, DArray *tokens, size_t *index);
+
+#endif // DECLARATION_H