gfs2-utils: master - gfs2l: Improve grammar layout and path parsing

Gitweb: http://git.fedorahosted.org/git/?p=gfs2-utils.git;a=commitdiff;h=9a61ff60... Commit: 9a61ff6028330e478ca67fbed5f9ef97c31662cc Parent: 1478c07d6490490ddb10be606760208243cb0bbd Author: Andrew Price <anprice(a)redhat.com&gt; AuthorDate: Sat May 18 23:04:34 2013 +0100 Committer: Andrew Price <anprice(a)redhat.com&gt; CommitterDate: Sat May 18 23:04:34 2013 +0100 gfs2l: Improve grammar layout and path parsing This makes a path a lexical entity so we don't have to kludge from a string in the parse stage. It also tidies up the grammar layout and simplifies the indentation to make it easier to maintain. Signed-off-by: Andrew Price <anprice(a)redhat.com&gt; --- gfs2/libgfs2/lexer.l | 5 + gfs2/libgfs2/parser.y | 198 ++++++++++++++++++++++++------------------------ 2 files changed, 104 insertions(+), 99 deletions(-) diff --git a/gfs2/libgfs2/lexer.l b/gfs2/libgfs2/lexer.l index 7fe1aba..04b3883 100644 --- a/gfs2/libgfs2/lexer.l +++ b/gfs2/libgfs2/lexer.l @@ -32,6 +32,7 @@ number ({decnumber}|{hexnumber}) offset \+{number} id {letter}({letter}|{decdigit}|\.)* string \'([^\']|\\\')*\' +path \'\/([^\']|\\\')*\' ccomment \/\/.*\n shcomment \#.*\n comment ({ccomment}|{shcomment}) @@ -69,6 +70,10 @@ get { state { P(STATE, AST_KW_STATE, yytext); } +{path} { + yytext[yyleng-1] = '\0'; + P(PATH, AST_EX_PATH, yytext + 1); + } {string} { yytext[yyleng-1] = '\0'; P(STRING, AST_EX_STRING, yytext + 1); diff --git a/gfs2/libgfs2/parser.y b/gfs2/libgfs2/parser.y index d60c1af..521c5df 100644 --- a/gfs2/libgfs2/parser.y +++ b/gfs2/libgfs2/parser.y @@ -35,106 +35,106 @@ static int yyerror(struct lgfs2_lang_state *state, yyscan_t lexer, const char *e %token TOK_GET %token TOK_STATE %token TOK_STRING +%token TOK_PATH %% -script: statements { - state->ls_ast_root = $1; - state->ls_interp_curr = $1; - } - | statements TOK_SEMI { - state->ls_ast_root = $1; - state->ls_interp_curr = $1; - } -; -statements: statements TOK_SEMI statement { - state->ls_ast_tail->ast_left = $3; - state->ls_ast_tail = $3; - $$ = $1; - } - | statement { - if (state->ls_ast_tail == NULL) - state->ls_ast_tail = $1; - $$ = $1; - } +script: statements { + state->ls_ast_root = $1; + state->ls_interp_curr = $1; + } + | statements TOK_SEMI { + state->ls_ast_root = $1; + state->ls_interp_curr = $1; + } ; - -statement: set_stmt { $$ = $1; } - | get_stmt { $$ = $1; } -; -set_stmt: TOK_SET blockspec structspec { - $1->ast_right = $2; - $2->ast_right = $3; - $$ = $1; - } - | TOK_SET blockspec typespec structspec { - $1->ast_right = $2; - $2->ast_right = $3; - $3->ast_right = $4; - $$ = $1; - } -; -get_stmt: TOK_GET blockspec { $1->ast_right = $2; $$ = $1; } - | TOK_GET blockspec TOK_STATE { - $1->ast_right = $2; - $2->ast_right = $3; - $$ = $1; - } -; -blockspec: offset { $$ = $1; } - | address { $$ = $1; } - | path { $$ = $1; } - | block_literal { $$ = $1; } - | subscript { $$ = $1; } -; -offset: blockspec TOK_OFFSET { - $2->ast_left = $1; - $$ = $2; - } -; -typespec: identifier { - $1->ast_type = AST_EX_TYPESPEC; - $$ = $1; - } -; -block_literal: identifier { $$ = $1; } -; -subscript: block_literal TOK_LBRACKET index TOK_RBRACKET { - $4->ast_left = $1; - $1->ast_left = $3; - $$ = $4; - } -; -index: number { $$ = $1; } - | identifier { $$ = $1; } -; -address: number { $1->ast_type = AST_EX_ADDRESS; $$ = $1; } -; -path: string { - if (*($1->ast_str) != '/') { - fprintf(stderr, "Path doesn't begin with '/': %s\n", $1->ast_str); - YYABORT; - } - $1->ast_type = AST_EX_PATH; - $$ = $1; - } -; -structspec: TOK_LBRACE fieldspecs TOK_RBRACE { $$ = $2; } -structspec: TOK_LBRACE TOK_RBRACE { $$ = NULL; } -; -fieldspecs: fieldspecs TOK_COMMA fieldspec { $1->ast_left = $3; $$ = $1; } - | fieldspec { $$ = $1; } -; -fieldspec: identifier TOK_COLON fieldvalue { - $2->ast_right = $1; - $1->ast_right = $3; - $$ = $2; - } -; -fieldvalue: number { $$ = $1; } - | string { $$ = $1; } -; -number: TOK_NUMBER { $$ = $1; } -string: TOK_STRING { $$ = $1; } -identifier: TOK_ID { $$ = $1; } +statements: statements TOK_SEMI statement { + state->ls_ast_tail->ast_left = $3; + state->ls_ast_tail = $3; + $$ = $1; + } + | statement { + if (state->ls_ast_tail == NULL) + state->ls_ast_tail = $1; + $$ = $1; + } +; +statement: set_stmt { $$ = $1;} + | get_stmt { $$ = $1; } +; +set_stmt: TOK_SET blockspec structspec { + $1->ast_right = $2; + $2->ast_right = $3; + $$ = $1; + } + | TOK_SET blockspec typespec structspec { + $1->ast_right = $2; + $2->ast_right = $3; + $3->ast_right = $4; + $$ = $1; + } +; +get_stmt: TOK_GET blockspec { + $1->ast_right = $2; $$ = $1; + } + | TOK_GET blockspec TOK_STATE { + $1->ast_right = $2; + $2->ast_right = $3; + $$ = $1; + } +; +blockspec: offset { $$ = $1; } + | address { $$ = $1; } + | path { $$ = $1; } + | block_literal { $$ = $1; } + | subscript { $$ = $1; } +; +offset: blockspec TOK_OFFSET { + $2->ast_left = $1; + $$ = $2; + } +; +typespec: identifier { + $1->ast_type = AST_EX_TYPESPEC; + $$ = $1; + } +; +block_literal: identifier { $$ = $1; } +; +subscript: block_literal TOK_LBRACKET index TOK_RBRACKET { + $4->ast_left = $1; + $1->ast_left = $3; + $$ = $4; + } +; +index: number { $$ = $1; } + | identifier { $$ = $1; } +; +address: number { + $1->ast_type = AST_EX_ADDRESS; + $$ = $1; + } +; +structspec: TOK_LBRACE fieldspecs TOK_RBRACE { $$ = $2; } + | TOK_LBRACE TOK_RBRACE { $$ = NULL; } +; +fieldspecs: fieldspecs TOK_COMMA fieldspec { + $1->ast_left = $3; + $$ = $1; + } + | fieldspec { $$ = $1; } +; +fieldspec: identifier TOK_COLON fieldvalue { + $2->ast_right = $1; + $1->ast_right = $3; + $$ = $2; + } +; +fieldvalue: number { $$ = $1; } + | string { $$ = $1; } +; +number: TOK_NUMBER { $$ = $1; } +string: TOK_STRING { $$ = $1; } +identifier: TOK_ID { $$ = $1; } +path: TOK_PATH { $$ = $1; } %% /**