From 64cf88403d6dd6e563a85055230d240e32704953 Mon Sep 17 00:00:00 2001 From: Michael Stapelberg Date: Sat, 13 Feb 2010 19:42:54 +0100 Subject: [PATCH] lexer/parser: proper error messages Error messages now look like this: 13.02.2010 19:42:30 - ERROR: 13.02.2010 19:42:30 - ERROR: CONFIG: syntax error, unexpected , expecting default/stacking/tabbed or stack-limit 13.02.2010 19:42:30 - ERROR: CONFIG: in file "inv", line 15: 13.02.2010 19:42:30 - ERROR: CONFIG: new_container foobar 13.02.2010 19:42:30 - ERROR: CONFIG: ^^^^^^ 13.02.2010 19:42:30 - ERROR: --- include/config.h | 17 +++++++++++- src/cfgparse.l | 71 +++++++++++++++++++++++++++++++++++++++++------- src/cfgparse.y | 33 ++++++++++++++++++---- src/mainx.c | 11 +++++++- 4 files changed, 114 insertions(+), 18 deletions(-) diff --git a/include/config.h b/include/config.h index fe5405bc..627fe525 100644 --- a/include/config.h +++ b/include/config.h @@ -3,7 +3,7 @@ * * i3 - an improved dynamic tiling window manager * - * © 2009 Michael Stapelberg and contributors + * © 2009-2010 Michael Stapelberg and contributors * * See file LICENSE for license information. * @@ -25,6 +25,21 @@ typedef struct Config Config; extern Config config; extern SLIST_HEAD(modes_head, Mode) modes; +/** + * Used during the config file lexing/parsing to keep the state of the lexer + * in order to provide useful error messages in yyerror(). + * + */ +struct context { + int line_number; + char *line_copy; + const char *filename; + + /* These are the same as in YYLTYPE */ + int first_column; + int last_column; +}; + /** * Part of the struct Config. It makes sense to group colors for background, * border and text as every element in i3 has them (window decorations, bar). diff --git a/src/cfgparse.l b/src/cfgparse.l index ce912549..1982452d 100644 --- a/src/cfgparse.l +++ b/src/cfgparse.l @@ -1,5 +1,7 @@ %option nounput %option noinput +%option noyy_top_state +%option stack %{ /* @@ -13,19 +15,57 @@ #include "data.h" #include "config.h" +#include "log.h" +#include "util.h" + +int yycolumn = 1; + +#define YY_DECL int yylex (struct context *context) + +#define YY_USER_ACTION { \ + context->first_column = yycolumn; \ + context->last_column = yycolumn+yyleng-1; \ + yycolumn += yyleng; \ +} + %} -%Start BIND_COND -%Start BINDSYM_COND -%Start BIND_AWS_COND -%Start BINDSYM_AWS_COND -%Start BIND_A2WS_COND -%Start ASSIGN_COND -%Start COLOR_COND -%Start SCREEN_COND -%Start SCREEN_AWS_COND +EOL (\r?\n) + +%s BIND_COND +%s BINDSYM_COND +%s BIND_AWS_COND +%s BINDSYM_AWS_COND +%s BIND_A2WS_COND +%s ASSIGN_COND +%s COLOR_COND +%s SCREEN_COND +%s SCREEN_AWS_COND +%x BUFFER_LINE %% + + { + /* This is called when a new line is lexed. We only want the + * first line to match to go into state BUFFER_LINE */ + if (context->line_number == 0) { + context->line_number = 1; + BEGIN(INITIAL); + yy_push_state(BUFFER_LINE); + } + } + +^[^\r\n]*/{EOL}? { + /* save whole line */ + context->line_copy = strdup(yytext); + + yyless(0); + yy_pop_state(); + yy_set_bol(true); + yycolumn = 1; +} + + [^\n]+ { BEGIN(INITIAL); yylval.string = strdup(yytext); return STR; } ^[ \t]*#[^\n]* { return TOKCOMMENT; } [0-9a-fA-F]+ { yylval.string = strdup(yytext); return HEX; } @@ -69,7 +109,11 @@ control { return TOKCONTROL; } ctrl { return TOKCONTROL; } shift { return TOKSHIFT; } → { return TOKARROW; } -\n /* ignore end of line */; +{EOL} { + FREE(context->line_copy); + context->line_number++; + yy_push_state(BUFFER_LINE); + } x { return (int)yytext[0]; } [ \t]+ { BEGIN(BIND_AWS_COND); return WHITESPACE; } [ \t]+ { BEGIN(BINDSYM_AWS_COND); return WHITESPACE; } @@ -91,4 +135,11 @@ shift { return TOKSHIFT; } [a-zA-Z0-9_]+ { yylval.string = strdup(yytext); return WORD; } [a-zA-Z]+ { yylval.string = strdup(yytext); return WORD; } . { return (int)yytext[0]; } + +<> { + while (yy_start_stack_ptr > 0) + yy_pop_state(); + yyterminate(); +} + %% diff --git a/src/cfgparse.y b/src/cfgparse.y index 1ce75724..3879cf97 100644 --- a/src/cfgparse.y +++ b/src/cfgparse.y @@ -24,17 +24,32 @@ #include "log.h" typedef struct yy_buffer_state *YY_BUFFER_STATE; -extern int yylex(void); +extern int yylex(struct context *context); extern int yyparse(void); extern FILE *yyin; YY_BUFFER_STATE yy_scan_string(const char *); static struct bindings_head *current_bindings; - -int yydebug = 1; - -void yyerror(const char *str) { - fprintf(stderr,"error: %s\n",str); +static struct context *context; + +/* We don’t need yydebug for now, as we got decent error messages using + * yyerror(). Should you ever want to extend the parser, it might be handy + * to just comment it in again, so it stays here. */ +//int yydebug = 1; + +void yyerror(const char *error_message) { + ELOG("\n"); + ELOG("CONFIG: %s\n", error_message); + ELOG("CONFIG: in file \"%s\", line %d:\n", + context->filename, context->line_number); + ELOG("CONFIG: %s\n", context->line_copy); + ELOG("CONFIG: "); + for (int c = 1; c <= context->last_column; c++) + if (c >= context->first_column) + printf("^"); + else printf(" "); + printf("\n"); + ELOG("\n"); } int yywrap() { @@ -149,11 +164,16 @@ void parse_file(const char *f) { yy_scan_string(new); + context = scalloc(sizeof(struct context)); + context->filename = f; + if (yyparse() != 0) { fprintf(stderr, "Could not parse configfile\n"); exit(1); } + FREE(context->line_copy); + free(context); free(new); free(buf); } @@ -162,6 +182,7 @@ void parse_file(const char *f) { %expect 1 %error-verbose +%lex-param { struct context *context } %union { int number; diff --git a/src/mainx.c b/src/mainx.c index 389fc76c..6dd72a17 100644 --- a/src/mainx.c +++ b/src/mainx.c @@ -150,6 +150,7 @@ int main(int argc, char *argv[], char *env[]) { int i, screens, opt; char *override_configpath = NULL; bool autostart = true; + bool only_check_config = false; xcb_connection_t *conn; xcb_property_handlers_t prophs; xcb_intern_atom_cookie_t atom_cookies[NUM_ATOMS]; @@ -170,7 +171,7 @@ int main(int argc, char *argv[], char *env[]) { start_argv = argv; - while ((opt = getopt_long(argc, argv, "c:vahld:V", long_options, &option_index)) != -1) { + while ((opt = getopt_long(argc, argv, "c:Cvahld:V", long_options, &option_index)) != -1) { switch (opt) { case 'a': LOG("Autostart disabled using -a\n"); @@ -179,6 +180,10 @@ int main(int argc, char *argv[], char *env[]) { case 'c': override_configpath = sstrdup(optarg); break; + case 'C': + LOG("Checking configuration file only (-C)\n"); + only_check_config = true; + break; case 'v': printf("i3 version " I3_VERSION " © 2009 Michael Stapelberg and contributors\n"); exit(EXIT_SUCCESS); @@ -218,6 +223,10 @@ int main(int argc, char *argv[], char *env[]) { die("Cannot open display\n"); load_configuration(conn, override_configpath, false); + if (only_check_config) { + LOG("Done checking configuration file. Exiting.\n"); + exit(0); + } /* Create the initial container on the first workspace. This used to * be part of init_table, but since it possibly requires an X -- 2.39.5