discover/grub2: Implement 'elif'

[petitboot] / discover / grub2 / parser.y

diff --git a/discover/grub2/parser.y b/discover/grub2/parser.y
index 0540ff3c088b768f106d945d8f1e86ee7660d0e3..81856dfcaa5a2002fce07a78460a6e1ddb0015d6 100644 (file)
--- a/discover/grub2/parser.y
+++ b/discover/grub2/parser.y
@@ -47,6 +47,9 @@ static void yyerror(struct grub2_parser *, char const *s);
 
 %type <statement>      statement
 %type <statements>     statements
+%type <statement>      conditional
+%type <statement>      elif
+%type <statements>     elifs
 %type <argv>           words
 %type <word>           word
 
@@ -75,6 +78,22 @@ statements: /* empty */ {
                $$ = $1;
        }
 
+conditional: statement TOKEN_EOL "then" TOKEN_EOL statements {
+               $$ = create_statement_conditional(parser, $1, $5);
+       }
+
+elif: "elif" TOKEN_DELIM conditional {
+               $$ = $3;
+      }
+
+elifs: /* empty */ {
+               $$ = create_statements(parser);
+       }
+       | elifs elif {
+               statement_append($1, $2);
+               $$ = $1;
+       }
+
 statement:
        words {
                   $$ = create_statement_simple(parser, $1);
@@ -82,19 +101,15 @@ statement:
        | '{' statements '}' {
                $$ = create_statement_block(parser, $2);
        }
-       | "if" TOKEN_DELIM statement
-               "then" TOKEN_EOL
-               statements
-               "fi" {
-               $$ = create_statement_if(parser, $3, $6, NULL);
+       | "if" TOKEN_DELIM conditional elifs "fi" {
+               $$ = create_statement_if(parser, $3, $4, NULL);
        }
-       | "if" TOKEN_DELIM statement
-               "then" TOKEN_EOL
-               statements
+       | "if" TOKEN_DELIM conditional
+               elifs
                "else" TOKEN_EOL
                statements
                "fi" {
-               $$ = create_statement_if(parser, $3, $6, $9);
+               $$ = create_statement_if(parser, $3, $4, $7);
        }
        | "function" TOKEN_DELIM word TOKEN_DELIM '{' statements '}' {
                $$ = create_statement_function(parser, $3, $6);
@@ -163,18 +178,33 @@ struct grub2_statement *create_statement_menuentry(struct grub2_parser *parser,
        return &stmt->st;
 }
 
-struct grub2_statement *create_statement_if(struct grub2_parser *parser,
+struct grub2_statement *create_statement_conditional(
+               struct grub2_parser *parser,
                struct grub2_statement *condition,
-               struct grub2_statements *true_case,
-               struct grub2_statements *false_case)
+               struct grub2_statements *statements)
+{
+       struct grub2_statement_conditional *stmt =
+               talloc(parser, struct grub2_statement_conditional);
+       stmt->st.type = STMT_TYPE_CONDITIONAL;
+       stmt->condition = condition;
+       stmt->statements = statements;
+       return &stmt->st;
+}
+
+struct grub2_statement *create_statement_if(struct grub2_parser *parser,
+               struct grub2_statement *conditional,
+               struct grub2_statements *elifs,
+               struct grub2_statements *else_case)
 {
        struct grub2_statement_if *stmt =
                talloc(parser, struct grub2_statement_if);
+
+       list_add(&elifs->list, &conditional->list);
+
        stmt->st.type = STMT_TYPE_IF;
        stmt->st.exec = statement_if_execute;
-       stmt->condition = condition;
-       stmt->true_case = true_case;
-       stmt->false_case = false_case;
+       stmt->conditionals = elifs;
+       stmt->else_case = else_case;
        return &stmt->st;
 }