From 8f4f87eabec13330a2b3a974975053c1e4632a11 Mon Sep 17 00:00:00 2001
From: scratko <m@scratko.xyz>
Date: Fri, 14 Jun 2024 15:15:41 +0300
Subject: Shell-V release

Added pipeline.
Formatting shell.c (created lexical_analysys.c).
Error codes.
Some functions of queue.c are created by preprocessor.
---
 lexical_analysis.c | 50 ++++++++++++++++++++++++++++++--------------------
 1 file changed, 30 insertions(+), 20 deletions(-)

(limited to 'lexical_analysis.c')

diff --git a/lexical_analysis.c b/lexical_analysis.c
index f931118..4349a69 100644
--- a/lexical_analysis.c
+++ b/lexical_analysis.c
@@ -1,5 +1,6 @@
 #include "lexical_analysis.h"
-MAKE_QUEUE_PUSH(c_queue, cmdline, char**)
+
+#include <stdio.h>
 
 int is_double_quotes_pair(struct param_type params)
 {
@@ -48,18 +49,14 @@ int is_empty_word(int ch, struct param_type params)
 int command_execution_condition(struct param_type *params)
 {
     return
-        (!filename_waiting(params) && !params->pipeline) ||
+        (params->tokens != '<' && params->tokens != '>' &&
+                params->tokens != append && !params->pipeline) ||
         (params->pipeline && params->tokens == '&');
 }
 
-int is_special_token(int ch)
+int is_first_special_token_character(int ch)
 {
-    return ch == and || ch == or || ch == '&' || ch == ';' || ch == '|';
-}
-
-int is_redirect_token(int ch, int next_ch)
-{
-    return ch == '<' || ch == '>' || (ch == '>' && next_ch == '>');
+    return ch == '<' || ch == '>' || ch == '&' || ch == '|' || ch == ';';
 }
 
 int excessive_words(int ch, struct param_type *params)
@@ -72,8 +69,10 @@ int excessive_words(int ch, struct param_type *params)
         while((next_ch = getchar()) != new_line) {
             if(next_ch == ' ')
                 continue;
-            if(!is_special_token(next_ch) && next_ch != '<' && next_ch != '>')
+            if(!is_first_special_token_character(next_ch)) {
+                params->wrong_command = err_extra_chars_after_filename;
                 return 1;
+            }
             else
                 break;
         }
@@ -88,7 +87,7 @@ void add_word_or_filename(struct w_queue *word_chain,
 {
     /* filenames */
     if(filename_waiting(params) && !params->wrong_command)
-            add_filename(tmp_word, params);
+        add_filename(tmp_word, params);
     /* execute command */
     else if(params->is_word)
         add_word(word_chain, tmp_word, params);
@@ -108,6 +107,17 @@ int is_double_token(struct param_type *params)
             params->tokens == append;
 }
 
+int is_special_token(int ch, int next_ch)
+{
+    return (ch == '&' && next_ch == '&') || (ch == '|' && ch == '|') ||
+            ch == '&' || ch == ';' || ch == '|';
+}
+
+int is_redirect_token(int ch, int next_ch)
+{
+    return ch == '<' || ch == '>' || (ch == '>' && next_ch == '>');
+}
+
 /*
  * redirection token verification
  */
@@ -130,14 +140,16 @@ int stream_redirect_tokens(struct w_queue *word_chain,
             if(is_double_token(params))
                 getchar();
             return 1;
-        } else {
-            fprintf(stderr, "syntax error\n");
-            params->wrong_command = 1;
-        }
+        } else
+            params->wrong_command = err_redirect_stream_again;
     }
     return 0;
 }
 
+/*
+ * the first element of the pipeline outputs to a file or
+ * redirects to a file in the middle of the pipeline
+ */
 int wrong_streams_redirection(struct param_type *params)
 {
     return
@@ -156,8 +168,7 @@ int pipeline_token_processing(struct w_queue *word_chain,
     char **cmdline = NULL;
     if(is_stream_redirection_set(params) &&
             wrong_streams_redirection(params)) {
-        /* TODO: add error codes */
-        params->wrong_command = 1;
+        params->wrong_command = err_redirect_stream_in_pipeline;
         return 0;
     }
     params->tokens = '|';
@@ -182,7 +193,7 @@ int special_tokens(struct w_queue *word_chain, struct c_queue *cmdlines,
     next_ch = getchar();
     ungetc(next_ch, stdin);
 
-    if(is_special_token(ch)) {
+    if(is_special_token(ch, next_ch)) {
         add_word_or_filename(word_chain, tmp_word, params);
 
         if(params->wrong_command)
@@ -199,8 +210,7 @@ int special_tokens(struct w_queue *word_chain, struct c_queue *cmdlines,
         else if(ch == '&') {
             while((ch = getchar()) != new_line) {
                 if(ch != whitespace && ch != tab) {
-                    fprintf(stderr, "incorrect command\n");
-                    params->wrong_command = 1;
+                    params->wrong_command = err_bg_process;
                     return 0;
                 }
             }
-- 
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