%pure-parser
%lex-param { yyscan_t scanner }
%parse-param { struct grub2_parser *parser }
+%error-verbose
%{
+#include <talloc/talloc.h>
+#include <log/log.h>
+
#include "grub2.h"
#include "parser.h"
#include "lexer.h"
#define YYLEX_PARAM parser->scanner
-static void yyerror(struct grub2_parser *, char const *s);
+void yyerror(struct grub2_parser *parser, const char *fmt, ...);
%}
%union {
%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"
%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"
%type <statement> statement
%type <statements> statements
+%type <statement> conditional
+%type <statement> elif
+%type <statements> elifs
%type <argv> words
%type <word> word
%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;
+ }
+
+sep: TOKEN_DELIM | TOKEN_EOL;
-statement: TOKEN_EOL {
- $$ = NULL;
+conditional: statement TOKEN_EOL "then" sep statements {
+ $$ = create_statement_conditional(parser, $1, $5);
+ }
+
+elif: "elif" TOKEN_DELIM conditional {
+ $$ = $3;
+ }
+
+elifs: /* empty */ {
+ $$ = create_statements(parser);
}
- | words TOKEN_EOL {
+ | elifs elif {
+ statement_append($1, $2);
+ $$ = $1;
+ }
+
+statement:
+ words {
$$ = create_statement_simple(parser, $1);
}
| '{' statements '}' {
$$ = create_statement_block(parser, $2);
}
- | "if" TOKEN_DELIM statement
- "then" TOKEN_EOL
+ | "if" TOKEN_DELIM conditional elifs "fi" {
+ $$ = create_statement_if(parser, $3, $4, NULL);
+ }
+ | "if" TOKEN_DELIM conditional
+ elifs
+ "else" sep
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);
}
%%
-void yyerror(struct grub2_parser *parser, char const *s)
+void yyerror(struct grub2_parser *parser, const char *fmt, ...)
+{
+ const char *str;
+ va_list ap;
+
+ va_start(ap, fmt);
+ str = talloc_vasprintf(parser, fmt, ap);
+ va_end(ap);
+
+ pb_log("parse error: %d('%s'): %s\n", yyget_lineno(parser->scanner),
+ yyget_text(parser->scanner), str);
+}
+
+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 = statement_block_execute;
+ 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)
{
- fprintf(stderr, "%d: error: %s '%s'\n",
- yyget_lineno(parser->scanner),
- s, yyget_text(parser->scanner));
+ YY_BUFFER_STATE bufstate;
+ int rc;
+
+ bufstate = yy_scan_bytes(buf, len - 1, parser->scanner);
+ yyset_lineno(1, parser->scanner);
+
+ rc = yyparse(parser);
+
+ yy_delete_buffer(bufstate, parser->scanner);
+
+ if (!rc)
+ script_execute(parser->script);
}
+
projects / petitboot / blobdiff