X-Git-Url: http://git.ozlabs.org/?p=petitboot;a=blobdiff_plain;f=discover%2Fgrub2%2Fparser.y;h=292ce0725b6af6bdffecc8ddad80c9e11f660460;hp=e13cd72a8f72e6358e7dfa7ab7387000b384efc4;hb=1a9af828d9ad0da0efa7af286db78c8904344e6b;hpb=e651a16f85e9df51ed65d96ea32932f69cbf302d

diff --git a/discover/grub2/parser.y b/discover/grub2/parser.y
index e13cd72..292ce07 100644
--- a/discover/grub2/parser.y
+++ b/discover/grub2/parser.y
@@ -2,6 +2,7 @@
 %pure-parser
 %lex-param { yyscan_t scanner }
 %parse-param { struct grub2_parser *parser }
+%error-verbose
 
 %{
 #include <talloc/talloc.h>
@@ -10,7 +11,10 @@
 #include "parser.h"
 #include "lexer.h"
 
+static void print_token(FILE *fp, int type, YYSTYPE value);
+
 #define YYLEX_PARAM parser->scanner
+#define YYPRINT(f, t, v) print_token(f, t, v)
 
 static void yyerror(struct grub2_parser *, char const *s);
 %}
@@ -38,6 +42,7 @@ static void yyerror(struct grub2_parser *, char const *s);
 %token	TOKEN_IN		"in"
 %token	TOKEN_MENUENTRY		"menuentry"
 %token	TOKEN_SELECT		"select"
+%token	TOKEN_SUBMENU		"submenu"
 %token	TOKEN_THEN		"then"
 %token	TOKEN_TIME		"time"
 %token	TOKEN_UTIL		"until"
@@ -45,6 +50,9 @@ 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
 
@@ -52,53 +60,75 @@ static void yyerror(struct grub2_parser *, char const *s);
 %token	TOKEN_EOL
 %token	TOKEN_DELIM
 %token	<word> TOKEN_WORD
+%token	TOKEN_EOF 0
 
 %start	script
 %debug
 
 %%
 
-script: statements {
+script:	statements {
 		parser->script->statements = $1;
 	}
 
-statements: statement {
+eol:	TOKEN_EOL | TOKEN_EOF;
+
+statements: /* empty */ {
 		$$ = create_statements(parser);
-		statement_append($$, $1);
 	}
-	| statements statement {
+	| statements statement eol {
 		statement_append($1, $2);
 		$$ = $1;
 	}
+	| statements TOKEN_EOL {
+		$$ = $1;
+	}
 
-statement: TOKEN_EOL {
-		$$ = NULL;
+conditional: statement TOKEN_EOL "then" TOKEN_EOL statements {
+		$$ = create_statement_conditional(parser, $1, $5);
 	}
-	| words TOKEN_EOL {
+
+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);
 	}
 	| '{' statements '}' {
 		$$ = create_statement_block(parser, $2);
 	}
-	| "if" TOKEN_DELIM statement
-		"then" TOKEN_EOL
-		statements
-		"fi" TOKEN_EOL {
-		$$ = create_statement_if(parser, $3, $6, NULL);
+	| "if" TOKEN_DELIM conditional elifs "fi" {
+		$$ = create_statement_if(parser, $3, $4, NULL);
 	}
-	| "if" TOKEN_DELIM statement
-		"then" TOKEN_EOL
-		statements
+	| "if" TOKEN_DELIM conditional
+		elifs
 		"else" TOKEN_EOL
 		statements
-		"fi" TOKEN_EOL {
-		$$ = create_statement_if(parser, $3, $6, $9);
+		"fi" {
+		$$ = create_statement_if(parser, $3, $4, $7);
+	}
+	| "function" TOKEN_DELIM word TOKEN_DELIM '{' statements '}' {
+		$$ = create_statement_function(parser, $3, $6);
 	}
 	| "menuentry" TOKEN_DELIM words TOKEN_DELIM
-		'{' statements '}'
-		TOKEN_EOL {
+		'{' statements '}' {
 		$$ = create_statement_menuentry(parser, $3, $6);
 	}
+	| "submenu" TOKEN_DELIM words TOKEN_DELIM
+		'{' statements '}' {
+		/* we just flatten everything */
+		$$ = create_statement_block(parser, $6);
+	}
 
 words:	word {
 		$$ = create_argv(parser);
@@ -123,6 +153,13 @@ void yyerror(struct grub2_parser *parser, char const *s)
 			s, yyget_text(parser->scanner));
 }
 
+static void print_token(FILE *fp, int type, YYSTYPE value)
+{
+	if (type != TOKEN_WORD)
+		return;
+	fprintf(fp, "%s", value.word->text);
+}
+
 struct grub2_statements *create_statements(struct grub2_parser *parser)
 {
 	struct grub2_statements *stmts = talloc(parser,
@@ -154,18 +191,33 @@ 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;
 }
 
@@ -180,6 +232,17 @@ struct grub2_statement *create_statement_block(struct grub2_parser *parser,
 	return &stmt->st;
 }
 
+struct grub2_statement *create_statement_function(struct grub2_parser *parser,
+		struct grub2_word *name, struct grub2_statements *body)
+{
+	struct grub2_statement_function *stmt =
+		talloc(parser, struct grub2_statement_function);
+	stmt->st.exec = statement_function_execute;
+	stmt->name = name;
+	stmt->body = body;
+	return &stmt->st;
+}
+
 void statement_append(struct grub2_statements *stmts,
 		struct grub2_statement *stmt)
 {
@@ -244,13 +307,15 @@ struct grub2_parser *grub2_parser_create(struct discover_context *ctx)
 void grub2_parser_parse(struct grub2_parser *parser, char *buf, int len)
 {
 	YY_BUFFER_STATE bufstate;
+	int rc;
 
 	bufstate = yy_scan_bytes(buf, len - 1, parser->scanner);
 
-	yyparse(parser);
+	rc = yyparse(parser);
 
 	yy_delete_buffer(bufstate, parser->scanner);
 
-	script_execute(parser->script);
+	if (!rc)
+		script_execute(parser->script);
 }