refactor: removed duplicate code for while/until loops in parser

src/parser/grammar_advanced.c

@@ -9,6 +9,8 @@
 #include "grammar.h"
 #include "grammar_basic.h"
 
+// === Static functions
+
 static enum ast_redir_type redir_tok_to_ast_type(enum token_type tok_type)
 {
     switch (tok_type)
@@ -32,6 +34,71 @@ static enum ast_redir_type redir_tok_to_ast_type(enum token_type tok_type)
     }
 }
 
+/*
+ * @brief parses a while/until loop starting with the condition
+ * (after the while/until keyword)
+ * @arg negate_condition Set to true for until loops, false for while loops
+ */
+static struct ast *parse_loop(struct lexer_context *ctx, bool negate_condition)
+{
+    // condition
+    struct ast *condition = parse_compound_list(ctx);
+    if (condition == NULL)
+        return NULL;
+    if (negate_condition)
+    {
+        condition =
+            ast_create_neg(true, condition); // TODO check result (beware to not
+                                             // exceed the function lines limit)
+    }
+
+    struct token *token = PEEK_TOKEN();
+
+    // 'do'
+    if (token->type != TOKEN_DO)
+    {
+        ast_free(&condition);
+        perror("Syntax error: expected the 'do' keyowrd but got a different "
+               "token");
+        return NULL;
+    }
+    POP_TOKEN();
+    token = PEEK_TOKEN();
+
+    // body
+    struct ast *body = parse_compound_list(ctx);
+    if (body == NULL)
+    {
+        ast_free(&condition);
+        return NULL;
+    }
+    token = PEEK_TOKEN();
+
+    // 'done'
+    if (token->type != TOKEN_DONE)
+    {
+        ast_free(&condition);
+        perror("Syntax error: expected the 'done' keyowrd but got a different "
+               "token");
+        return NULL;
+    }
+    POP_TOKEN();
+
+    struct ast *result = ast_create_loop(condition, body);
+    if (result == NULL)
+    {
+        ast_free(&condition);
+        ast_free(&body);
+        perror("Internal error: could not create ast node (is your memory full "
+               "?)");
+        return NULL;
+    }
+
+    return result;
+}
+
+// === Functions
+
 struct ast *parse_redirection(struct lexer_context *ctx)
 {
     struct token *token = PEEK_TOKEN();
@@ -110,53 +177,7 @@ struct ast *parse_while(struct lexer_context *ctx)
     }
     POP_TOKEN();
 
-    // condition
+    return parse_loop(ctx, true);
-    struct ast *condition = parse_compound_list(ctx);
-    if (condition == NULL)
-        return NULL;
-    token = PEEK_TOKEN();
-
-    // 'do'
-    if (token->type != TOKEN_DO)
-    {
-        ast_free(&condition);
-        perror("Syntax error: expected the 'do' keyowrd but got a different "
-               "token");
-        return NULL;
-    }
-    POP_TOKEN();
-    token = PEEK_TOKEN();
-
-    // body
-    struct ast *body = parse_compound_list(ctx);
-    if (body == NULL)
-    {
-        ast_free(&condition);
-        return NULL;
-    }
-    token = PEEK_TOKEN();
-
-    // 'done'
-    if (token->type != TOKEN_DONE)
-    {
-        ast_free(&condition);
-        perror("Syntax error: expected the 'done' keyowrd but got a different "
-               "token");
-        return NULL;
-    }
-    POP_TOKEN();
-
-    struct ast *result = ast_create_loop(condition, body);
-    if (result == NULL)
-    {
-        ast_free(&condition);
-        ast_free(&body);
-        perror("Internal error: could not create ast node (is your memory full "
-               "?)");
-        return NULL;
-    }
-
-    return result;
 }
 
 struct ast *parse_until(struct lexer_context *ctx)
@@ -172,54 +193,5 @@ struct ast *parse_until(struct lexer_context *ctx)
     }
     POP_TOKEN();
 
-    // condition
+    return parse_loop(ctx, true);
-    struct ast *condition = parse_compound_list(ctx);
-    if (condition == NULL)
-        return NULL;
-    condition =
-        ast_create_neg(true, condition); // TODO check result (beware to not
-                                         // exceed function lines limit)
-    token = PEEK_TOKEN();
-
-    // 'do'
-    if (token->type != TOKEN_DO)
-    {
-        ast_free(&condition);
-        perror("Syntax error: expected the 'do' keyowrd but got a different "
-               "token");
-        return NULL;
-    }
-    POP_TOKEN();
-    token = PEEK_TOKEN();
-
-    // body
-    struct ast *body = parse_compound_list(ctx);
-    if (body == NULL)
-    {
-        ast_free(&condition);
-        return NULL;
-    }
-    token = PEEK_TOKEN();
-
-    // 'done'
-    if (token->type != TOKEN_DONE)
-    {
-        ast_free(&condition);
-        perror("Syntax error: expected the 'done' keyowrd but got a different "
-               "token");
-        return NULL;
-    }
-    POP_TOKEN();
-
-    struct ast *result = ast_create_loop(condition, body);
-    if (result == NULL)
-    {
-        ast_free(&condition);
-        ast_free(&body);
-        perror("Internal error: could not create ast node (is your memory full "
-               "?)");
-        return NULL;
-    }
-
-    return result;
 }

src/parser/grammar_basic.c

@@ -349,7 +349,15 @@ struct ast *parse_shell_command(struct lexer_context *ctx)
     {
         return parse_if_rule(ctx);
     }
-    // TODO loops and case
+    else if (is_first(*token, RULE_WHILE))
+    {
+        return parse_while(ctx);
+    }
+    else if (is_first(*token, RULE_UNTIL))
+    {
+        return parse_until(ctx);
+    }
+    // TODO for and case
     else
     {
         perror("Syntax error: unexpected token in parse_shell_command");