add first version of a new flex/bison based command parser
This commit is contained in:
Michael Stapelberg
274
src/cmdparse.y
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274
src/cmdparse.y
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@ -0,0 +1,274 @@
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%{
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/*
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* vim:ts=4:sw=4:expandtab
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*
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* i3 - an improved dynamic tiling window manager
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* © 2009-2010 Michael Stapelberg and contributors (see also: LICENSE)
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*
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* cmdparse.y: the parser for commands you send to i3 (or bind on keys)
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*
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include "all.h"
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typedef struct yy_buffer_state *YY_BUFFER_STATE;
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extern int cmdyylex(struct context *context);
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extern int cmdyyparse(void);
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extern FILE *cmdyyin;
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YY_BUFFER_STATE cmdyy_scan_string(const char *);
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static struct bindings_head *current_bindings;
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static struct context *context;
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static Match current_match;
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/*
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* Helper data structure for an operation window (window on which the operation
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* will be performed). Used to build the TAILQ owindows.
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*
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*/
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typedef struct owindow {
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Con *con;
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TAILQ_ENTRY(owindow) owindows;
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} owindow;
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static TAILQ_HEAD(owindows_head, owindow) owindows;
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/* We don’t need yydebug for now, as we got decent error messages using
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* yyerror(). Should you ever want to extend the parser, it might be handy
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* to just comment it in again, so it stays here. */
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//int cmdyydebug = 1;
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void cmdyyerror(const char *error_message) {
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ELOG("\n");
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ELOG("CMD: %s\n", error_message);
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ELOG("CMD: in file \"%s\", line %d:\n",
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context->filename, context->line_number);
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ELOG("CMD: %s\n", context->line_copy);
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ELOG("CMD: ");
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for (int c = 1; c <= context->last_column; c++)
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if (c >= context->first_column)
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printf("^");
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else printf(" ");
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printf("\n");
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ELOG("\n");
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}
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int cmdyywrap() {
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return 1;
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}
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void parse_cmd(const char *new) {
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//const char *new = "[level-up workspace] attach $output, focus";
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cmdyy_scan_string(new);
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context = scalloc(sizeof(struct context));
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context->filename = "cmd";
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if (cmdyyparse() != 0) {
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fprintf(stderr, "Could not parse configfile\n");
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exit(1);
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}
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printf("done\n");
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FREE(context->line_copy);
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free(context);
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}
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%}
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%error-verbose
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%lex-param { struct context *context }
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%union {
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char *string;
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}
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%token TOK_ATTACH "attach"
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%token TOK_EXEC "exec"
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%token TOK_EXIT "exit"
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%token TOK_RELOAD "reload"
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%token TOK_RESTART "restart"
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%token TOK_KILL "kill"
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%token TOK_FULLSCREEN "fullscreen"
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%token TOK_GLOBAL "global"
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%token TOK_LAYOUT "layout"
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%token TOK_DEFAULT "default"
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%token TOK_STACKED "stacked"
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%token TOK_TABBED "tabbed"
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%token TOK_BORDER "border"
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%token TOK_NONE "none"
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%token TOK_1PIXEL "1pixel"
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%token TOK_MODE "mode"
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%token TOK_TILING "tiling"
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%token TOK_FLOATING "floating"
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%token TOK_WORKSPACE "workspace"
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%token TOK_FOCUS "focus"
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%token TOK_MOVE "move"
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%token TOK_CLASS "class"
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%token WHITESPACE "<whitespace>"
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%token STR "<string>"
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%%
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commands: /* empty */
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| commands optwhitespace ';' optwhitespace command
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| command
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{
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owindow *current;
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printf("single command completely parsed, dropping state...\n");
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while (!TAILQ_EMPTY(&owindows)) {
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current = TAILQ_FIRST(&owindows);
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TAILQ_REMOVE(&owindows, current, owindows);
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free(current);
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}
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}
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;
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optwhitespace:
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| WHITESPACE
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;
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command:
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match optwhitespace operations
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;
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match:
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| matchstart optwhitespace criteria optwhitespace matchend
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{
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printf("match parsed\n");
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}
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;
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matchstart:
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'['
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{
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printf("start\n");
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memset(¤t_match, '\0', sizeof(Match));
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TAILQ_INIT(&owindows);
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/* copy all_cons */
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Con *con;
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TAILQ_FOREACH(con, &all_cons, all_cons) {
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if (con->window == NULL)
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continue;
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owindow *ow = smalloc(sizeof(owindow));
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ow->con = con;
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TAILQ_INSERT_TAIL(&owindows, ow, owindows);
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}
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}
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;
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matchend:
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']'
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{
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owindow *next, *current;
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printf("match specification finished, matching...\n");
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/* copy the old list head to iterate through it and start with a fresh
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* list which will contain only matching windows */
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struct owindows_head old = owindows;
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TAILQ_INIT(&owindows);
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for (next = TAILQ_FIRST(&old); next != TAILQ_END(&old);) {
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/* make a copy of the next pointer and advance the pointer to the
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* next element as we are going to invalidate the element’s
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* next/prev pointers by calling TAILQ_INSERT_TAIL later */
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current = next;
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next = TAILQ_NEXT(next, owindows);
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printf("checking if con %p / %s matches\n", current->con, current->con->name);
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if (match_matches_window(¤t_match, current->con->window)) {
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printf("matches!\n");
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TAILQ_INSERT_TAIL(&owindows, current, owindows);
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} else {
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printf("doesnt match\n");
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free(current);
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}
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}
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TAILQ_FOREACH(current, &owindows, owindows) {
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printf("matching: %p / %s\n", current->con, current->con->name);
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}
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}
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;
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criteria:
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TOK_CLASS '=' STR
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{
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printf("criteria: class = %s\n", $<string>3);
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current_match.class = $<string>3;
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}
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;
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operations:
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operation
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| operation optwhitespace
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| operations ',' optwhitespace operation
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;
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operation:
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exec
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| exit
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/*| reload
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| restart
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| mark
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| fullscreen
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| layout
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| border
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| mode
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| workspace
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| move*/
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| attach
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| focus
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| kill
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;
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exec:
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TOK_EXEC WHITESPACE STR
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{
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printf("should execute %s\n", $<string>3);
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}
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;
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exit:
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TOK_EXIT
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{
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printf("exit, bye bye\n");
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}
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;
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attach:
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TOK_ATTACH
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{
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printf("should attach\n");
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}
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;
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focus:
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TOK_FOCUS
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{
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printf("should focus\n");
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}
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;
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kill:
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TOK_KILL
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{
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owindow *current;
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printf("killing!\n");
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TAILQ_FOREACH(current, &owindows, owindows) {
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printf("matching: %p / %s\n", current->con, current->con->name);
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tree_close(current->con);
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}
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}
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;
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