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|
%pure-parser
%lex-param { yyscan_t scanner }
%parse-param { struct grub2_parser *parser }
%{
#include <talloc/talloc.h>
#include "grub2.h"
#include "parser.h"
#include "lexer.h"
#define YYLEX_PARAM parser->scanner
static void yyerror(struct grub2_parser *, char const *s);
%}
%union {
struct grub2_word *word;
struct grub2_argv *argv;
struct grub2_statement *statement;
struct grub2_statements *statements;
}
/* reserved words */
%token TOKEN_LDSQBRACKET "[["
%token TOKEN_RDSQBRACKET "]]"
%token TOKEN_CASE "case"
%token TOKEN_DO "do"
%token TOKEN_DONE "done"
%token TOKEN_ELIF "elif"
%token TOKEN_ESAC "esac"
%token TOKEN_FI "fi"
%token TOKEN_FOR "for"
%token TOKEN_FUNCTION "function"
%token TOKEN_IF "if"
%token TOKEN_IN "in"
%token TOKEN_MENUENTRY "menuentry"
%token TOKEN_SELECT "select"
%token TOKEN_THEN "then"
%token TOKEN_TIME "time"
%token TOKEN_UTIL "until"
%token TOKEN_WHILE "while"
%type <statement> statement
%type <statements> statements
%type <argv> words
%type <word> word
/* syntax */
%token TOKEN_EOL
%token TOKEN_DELIM
%token <word> TOKEN_WORD
%start script
%debug
%%
script: statements {
parser->script->statements = $1;
}
statements: statement {
$$ = create_statements(parser);
statement_append($$, $1);
}
| statements statement {
statement_append($1, $2);
$$ = $1;
}
statement: TOKEN_EOL {
$$ = NULL;
}
| words TOKEN_EOL {
$$ = create_statement_simple(parser, $1);
}
| '{' statements '}' {
$$ = create_statement_block(parser, $2);
}
| "if" TOKEN_DELIM statement
"then" TOKEN_EOL
statements
"fi" TOKEN_EOL {
$$ = create_statement_if(parser, $3, $6, NULL);
}
| "menuentry" TOKEN_DELIM words TOKEN_DELIM
'{' statements '}'
TOKEN_EOL {
$$ = create_statement_menuentry(parser, $3, $6);
}
words: word {
$$ = create_argv(parser);
argv_append($$, $1);
}
| words TOKEN_DELIM word {
argv_append($1, $3);
$$ = $1;
}
word: TOKEN_WORD
| word TOKEN_WORD {
word_append($1, $2);
$$ = $1;
}
%%
void yyerror(struct grub2_parser *parser, char const *s)
{
fprintf(stderr, "%d: error: %s '%s'\n",
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_if(struct grub2_parser *parser,
struct grub2_statement *condition,
struct grub2_statements *true_case,
struct grub2_statements *false_case)
{
struct grub2_statement_if *stmt =
talloc(parser, struct grub2_statement_if);
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;
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;
}
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;
}
|
