From 94abb9e3d43e7559befb0aa02894227ec02eab41 Mon Sep 17 00:00:00 2001
From: Aryadev Chavali <aryadev@aryadevchavali.com>
Date: Wed, 25 Oct 2023 21:43:13 +0100
Subject: Separated lexer from main file in asm

---
 asm/main.c | 157 ++-----------------------------------------------------------
 1 file changed, 3 insertions(+), 154 deletions(-)

(limited to 'asm/main.c')

diff --git a/asm/main.c b/asm/main.c
index 042850a..2415fa1 100644
--- a/asm/main.c
+++ b/asm/main.c
@@ -10,165 +10,14 @@
  * Description: Assembly source code compiler, targeting OVM
  */
 
-#include <ctype.h>
-#include <stdbool.h>
-#include <stdio.h>
-#include <string.h>
-
 #include <lib/darr.h>
 
-typedef enum TokenType
-{
-  TOKEN_BYTE_LITERAL,
-  TOKEN_HWORD_LITERAL,
-  TOKEN_WORD_LITERAL,
-  TOKEN_SYMBOL,
-} token_type_t;
-
-const char *token_type_as_cstr(token_type_t type)
-{
-  switch (type)
-  {
-  case TOKEN_BYTE_LITERAL:
-    return "BYTE_LITERAL";
-  case TOKEN_HWORD_LITERAL:
-    return "HWORD_LITERAL";
-  case TOKEN_WORD_LITERAL:
-    return "WORD_LITERAL";
-  case TOKEN_SYMBOL:
-    return "SYMBOL";
-  }
-  return "";
-}
-
-typedef struct
-{
-  token_type_t type;
-  char *str;
-  size_t str_size;
-} token_t;
-
-// We can use darr_read_file as an in memory buffer of source code
-// Then just create new darr's for tokens, then instructions.  Then
-// emit bytecode in the end.
-typedef darr_t buffer_t;
-
-size_t space_left(buffer_t *buffer)
-{
-  if (buffer->available == buffer->used)
-    return 0;
-  return buffer->available - 1 - buffer->used;
-}
-
-bool is_symbol(char c)
-{
-  return isalpha(c) || c == '-' || c == '_';
-}
-
-token_t tokenise_symbol(buffer_t *buffer)
-{
-  token_t token = {.type = TOKEN_SYMBOL, .str_size = 0};
-  for (; token.str_size < space_left(buffer) &&
-         is_symbol(buffer->data[buffer->used + token.str_size]);
-       ++token.str_size)
-    continue;
-  token.str = calloc(token.str_size + 1, 1);
-  memcpy(token.str, buffer->data + buffer->used, token.str_size);
-  token.str[token.str_size] = '\0';
-  buffer->used += token.str_size;
-  return token;
-}
-
-void tokenise_literal(buffer_t *buffer, token_t *token)
-{
-  token->str_size = 0;
-  for (; token->str_size < space_left(buffer) &&
-         isdigit(buffer->data[buffer->used + token->str_size]);
-       ++token->str_size)
-    continue;
-  token->str = calloc(token->str_size + 1, 1);
-  memcpy(token->str, buffer->data + buffer->used, token->str_size);
-  token->str[token->str_size] = '\0';
-  buffer->used += token->str_size;
-}
-
-token_t tokenise_byte_literal(buffer_t *buffer)
-{
-  token_t token = {.type = TOKEN_BYTE_LITERAL};
-  tokenise_literal(buffer, &token);
-  return token;
-}
-
-token_t tokenise_hword_literal(buffer_t *buffer)
-{
-  token_t token = {.type = TOKEN_HWORD_LITERAL};
-  tokenise_literal(buffer, &token);
-  return token;
-}
-
-token_t tokenise_word_literal(buffer_t *buffer)
-{
-  token_t token = {.type = TOKEN_WORD_LITERAL};
-  tokenise_literal(buffer, &token);
-  return token;
-}
-
-token_t *tokenise_buffer(buffer_t *buffer, size_t *n_tokens)
-{
-  buffer_t tokens = {0};
-  darr_init(&tokens, sizeof(token_t));
-  while (space_left(buffer) != 0)
-  {
-    bool is_token = true;
-    token_t t     = {0};
-    char c        = buffer->data[buffer->used];
-    if (isspace(c) || c == '\0')
-    {
-      // Clean whitespace
-      for (; space_left(buffer) > 0 && (isspace(c) || c == '\0');
-           ++buffer->used, c = buffer->data[buffer->used])
-        continue;
-      is_token = false;
-    }
-    else if (space_left(buffer) > 1 && isdigit(buffer->data[buffer->used + 1]))
-    {
-      // Parsing literals
-
-      switch (c)
-      {
-      case 'b':
-        buffer->used++;
-        t = tokenise_byte_literal(buffer);
-        break;
-      case 'h':
-        buffer->used++;
-        t = tokenise_hword_literal(buffer);
-        break;
-      case 'w':
-        buffer->used++;
-        t = tokenise_word_literal(buffer);
-        break;
-      default:
-        // TODO: Lex Error (INVALID_LITERAL)
-        fprintf(stderr, "[LEX_ERROR]: Invalid literal `%c`\n", c);
-        exit(1);
-      }
-    }
-    else if (is_symbol(c))
-    {
-      t = tokenise_symbol(buffer);
-    }
-    if (is_token)
-      darr_append_bytes(&tokens, (byte *)&t, sizeof(t));
-  }
-  *n_tokens = tokens.used / sizeof(token_t);
-  return (token_t *)tokens.data;
-}
+#include "./lexer.h"
 
 int main(void)
 {
-  FILE *fp        = fopen("main.asm", "rb");
-  buffer_t buffer = darr_read_file(fp);
+  FILE *fp      = fopen("main.asm", "rb");
+  darr_t buffer = darr_read_file(fp);
   fclose(fp);
 
   size_t n        = 0;
-- 
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