X-Git-Url: https://git.ozlabs.org/?p=petitboot;a=blobdiff_plain;f=discover%2Fgrub2%2Fparser.y;h=81856dfcaa5a2002fce07a78460a6e1ddb0015d6;hp=a8c02e284b6d7b4507003839e1d5eb483814617f;hb=d39ae394911f945cd4a7789a8b210a5662852c46;hpb=ce2275ed4fa099035af123c25a1a7657f1ea6e78

diff --git a/discover/grub2/parser.y b/discover/grub2/parser.y
index a8c02e2..81856df 100644
--- a/discover/grub2/parser.y
+++ b/discover/grub2/parser.y
@@ -2,8 +2,11 @@
 %pure-parser
 %lex-param { yyscan_t scanner }
 %parse-param { struct grub2_parser *parser }
+%error-verbose
 
 %{
+#include <talloc/talloc.h>
+
 #include "grub2.h"
 #include "parser.h"
 #include "lexer.h"
@@ -27,6 +30,7 @@ static void yyerror(struct grub2_parser *, char const *s);
 %token	TOKEN_DO		"do"
 %token	TOKEN_DONE		"done"
 %token	TOKEN_ELIF		"elif"
+%token	TOKEN_ELSE		"else"
 %token	TOKEN_ESAC		"esac"
 %token	TOKEN_FI		"fi"
 %token	TOKEN_FOR		"for"
@@ -35,6 +39,7 @@ 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"
@@ -42,6 +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
 
@@ -55,36 +63,66 @@ static void yyerror(struct grub2_parser *, char const *s);
 
 %%
 
-script: statements {
-		parser->statements = $1;
+script:	statements {
+		parser->script->statements = $1;
 	}
 
-statements: statement {
+statements: /* empty */ {
 		$$ = create_statements(parser);
-		statement_append($$, $1);
 	}
-	| statements statement {
+	| statements statement TOKEN_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);
+	}
+
+elif: "elif" TOKEN_DELIM conditional {
+		$$ = $3;
+      }
+
+elifs: /* empty */ {
+		$$ = create_statements(parser);
+	}
+	| elifs elif {
+		statement_append($1, $2);
+		$$ = $1;
 	}
-	| words TOKEN_EOL {
+
+statement:
+	words {
 		   $$ = create_statement_simple(parser, $1);
 	}
-	| '{' statements '}' { $$ = NULL; }
-	| "if" TOKEN_DELIM statement
-		"then" TOKEN_EOL
+	| '{' statements '}' {
+		$$ = create_statement_block(parser, $2);
+	}
+	| "if" TOKEN_DELIM conditional elifs "fi" {
+		$$ = create_statement_if(parser, $3, $4, NULL);
+	}
+	| "if" TOKEN_DELIM conditional
+		elifs
+		"else" TOKEN_EOL
 		statements
-		"fi" TOKEN_EOL {
-		$$ = create_statement_if(parser, $3, $6, NULL);
+		"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);
@@ -108,3 +146,163 @@ void yyerror(struct grub2_parser *parser, char const *s)
 			yyget_lineno(parser->scanner),
 			s, yyget_text(parser->scanner));
 }
+
+struct grub2_statements *create_statements(struct grub2_parser *parser)
+{
+	struct grub2_statements *stmts = talloc(parser,
+			struct grub2_statements);
+	list_init(&stmts->list);
+	return stmts;
+}
+
+struct grub2_statement *create_statement_simple(struct grub2_parser *parser,
+		struct grub2_argv *argv)
+{
+	struct grub2_statement_simple *stmt =
+		talloc(parser, struct grub2_statement_simple);
+	stmt->st.type = STMT_TYPE_SIMPLE;
+	stmt->st.exec = statement_simple_execute;
+	stmt->argv = argv;
+	return &stmt->st;
+}
+
+struct grub2_statement *create_statement_menuentry(struct grub2_parser *parser,
+		struct grub2_argv *argv, struct grub2_statements *stmts)
+{
+	struct grub2_statement_menuentry *stmt =
+		talloc(parser, struct grub2_statement_menuentry);
+	stmt->st.type = STMT_TYPE_MENUENTRY;
+	stmt->st.exec = statement_menuentry_execute;
+	stmt->argv = argv;
+	stmt->statements = stmts;
+	return &stmt->st;
+}
+
+struct grub2_statement *create_statement_conditional(
+		struct grub2_parser *parser,
+		struct grub2_statement *condition,
+		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->conditionals = elifs;
+	stmt->else_case = else_case;
+	return &stmt->st;
+}
+
+struct grub2_statement *create_statement_block(struct grub2_parser *parser,
+		struct grub2_statements *stmts)
+{
+	struct grub2_statement_block *stmt =
+		talloc(parser, struct grub2_statement_block);
+	stmt->st.type = STMT_TYPE_BLOCK;
+	stmt->st.exec = NULL;
+	stmt->statements = stmts;
+	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)
+{
+	if (!stmt)
+		return;
+	list_add_tail(&stmts->list, &stmt->list);
+}
+
+struct grub2_word *create_word_text(struct grub2_parser *parser,
+		const char *text)
+{
+	struct grub2_word *word = talloc(parser, struct grub2_word);
+	word->type = GRUB2_WORD_TEXT;
+	word->split = false;
+	word->text = talloc_strdup(word, text);
+	word->next = NULL;
+	word->last = word;
+	return word;
+}
+
+struct grub2_word *create_word_var(struct grub2_parser *parser,
+		const char *name, bool split)
+{
+	struct grub2_word *word = talloc(parser, struct grub2_word);
+	word->type = GRUB2_WORD_VAR;
+	word->name = talloc_strdup(word, name);
+	word->split = split;
+	word->next = NULL;
+	word->last = word;
+	return word;
+}
+
+struct grub2_argv *create_argv(struct grub2_parser *parser)
+{
+	struct grub2_argv *argv = talloc(parser, struct grub2_argv);
+	list_init(&argv->words);
+	return argv;
+}
+
+void argv_append(struct grub2_argv *argv, struct grub2_word *word)
+{
+	list_add_tail(&argv->words, &word->argv_list);
+}
+
+void word_append(struct grub2_word *w1, struct grub2_word *w2)
+{
+	w1->last->next = w2;
+	w1->last = w2;
+}
+
+struct grub2_parser *grub2_parser_create(struct discover_context *ctx)
+{
+	struct grub2_parser *parser;
+
+	parser = talloc(ctx, struct grub2_parser);
+	yylex_init_extra(parser, &parser->scanner);
+	parser->script = create_script(parser, ctx);
+
+	return parser;
+}
+
+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);
+
+	rc = yyparse(parser);
+
+	yy_delete_buffer(bufstate, parser->scanner);
+
+	if (!rc)
+		script_execute(parser->script);
+}
+