/* Bison Grammar Scanner -*- C -*- Copyright (C) 2002 Free Software Foundation, Inc. This file is part of Bison, the GNU Compiler Compiler. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ %option debug nodefault noyywrap nounput never-interactive stack %option prefix="gram_" outfile="lex.yy.c" %{ #include "system.h" #include "complain.h" #include "quote.h" #include "getargs.h" #include "gram.h" #include "reader.h" /* Each time we match a string, move the end cursor to its end. */ #define YY_USER_INIT \ do { \ LOCATION_RESET (*yylloc); \ yylloc->file = infile; \ /* This is only to avoid GCC warnings. */ \ if (yycontrol) {;}; \ } while (0) #define YY_USER_ACTION LOCATION_COLUMNS (*yylloc, yyleng); #define YY_LINES LOCATION_LINES (*yylloc, yyleng); #define YY_STEP LOCATION_STEP (*yylloc); /* STRING_OBSTACK -- Used to store all the characters that we need to keep (to construct ID, STRINGS etc.). Use the following macros to use it. Use YY_OBS_GROW to append what has just been matched, and YY_OBS_FINISH to end the string (it puts the ending 0). YY_OBS_FINISH also stores this string in LAST_STRING, which can be used, and which is used by YY_OBS_FREE to free the last string. */ static struct obstack string_obstack; char *last_string; #define YY_OBS_GROW \ obstack_grow (&string_obstack, yytext, yyleng) #define YY_OBS_FINISH \ do { \ obstack_1grow (&string_obstack, '\0'); \ last_string = obstack_finish (&string_obstack); \ } while (0) #define YY_OBS_FREE \ do { \ obstack_free (&string_obstack, last_string); \ } while (0) void scanner_last_string_free (void) { YY_OBS_FREE; } static int braces_level = 0; static int percent_percent_count = 0; /* Within well-formed rules, RULE_LENGTH is the number of values in the current rule so far, which says where to find `$0' with respect to the top of the stack. It is not the same as the rule->length in the case of mid rule actions. Outside of well-formed rules, RULE_LENGTH has an undefined value. */ static int rule_length; static void handle_dollar (braced_code_t code_kind, char *cp, location_t location); static void handle_at (braced_code_t code_kind, char *cp, location_t location); %} %x SC_COMMENT %x SC_STRING SC_CHARACTER %x SC_ESCAPED_STRING SC_ESCAPED_CHARACTER %x SC_BRACED_CODE SC_PROLOGUE SC_EPILOGUE id [.a-zA-Z_][.a-zA-Z_0-9]* int [0-9]+ eols (\n|\r|\n\r|\r\n)+ blanks [ \t\f]+ %% %{ /* At each yylex invocation, mark the current position as the start of the next token. */ YY_STEP; %} /*----------------------------. | Scanning Bison directives. | `----------------------------*/ { "%binary" return PERCENT_NONASSOC; "%debug" return PERCENT_DEBUG; "%define" return PERCENT_DEFINE; "%defines" return PERCENT_DEFINES; "%destructor" return PERCENT_DESTRUCTOR; "%dprec" return PERCENT_DPREC; "%error"[-_]"verbose" return PERCENT_ERROR_VERBOSE; "%expect" return PERCENT_EXPECT; "%file-prefix" return PERCENT_FILE_PREFIX; "%fixed"[-_]"output"[-_]"files" return PERCENT_YACC; "%glr-parser" return PERCENT_GLR_PARSER; "%left" return PERCENT_LEFT; "%locations" return PERCENT_LOCATIONS; "%merge" return PERCENT_MERGE; "%name"[-_]"prefix" return PERCENT_NAME_PREFIX; "%no"[-_]"lines" return PERCENT_NO_LINES; "%nonassoc" return PERCENT_NONASSOC; "%nterm" return PERCENT_NTERM; "%output" return PERCENT_OUTPUT; "%parse-param" return PERCENT_PARSE_PARAM; "%prec" { rule_length--; return PERCENT_PREC; } "%printer" return PERCENT_PRINTER; "%pure"[-_]"parser" return PERCENT_PURE_PARSER; "%right" return PERCENT_RIGHT; "%lex-param" return PERCENT_LEX_PARAM; "%skeleton" return PERCENT_SKELETON; "%start" return PERCENT_START; "%term" return PERCENT_TOKEN; "%token" return PERCENT_TOKEN; "%token"[-_]"table" return PERCENT_TOKEN_TABLE; "%type" return PERCENT_TYPE; "%union" return PERCENT_UNION; "%verbose" return PERCENT_VERBOSE; "%yacc" return PERCENT_YACC; "=" return EQUAL; ":" { rule_length = 0; return COLON; } "|" { rule_length = 0; return PIPE; } "," return COMMA; ";" return SEMICOLON; {eols} YY_LINES; YY_STEP; {blanks} YY_STEP; {id} { yylval->symbol = symbol_get (yytext, *yylloc); rule_length++; return ID; } {int} yylval->integer = strtol (yytext, 0, 10); return INT; /* Characters. We don't check there is only one. */ "'" YY_OBS_GROW; yy_push_state (SC_ESCAPED_CHARACTER); /* Strings. */ "\"" YY_OBS_GROW; yy_push_state (SC_ESCAPED_STRING); /* Comments. */ "/*" yy_push_state (SC_COMMENT); "//".* YY_STEP; /* Prologue. */ "%{" yy_push_state (SC_PROLOGUE); /* Code in between braces. */ "{" YY_OBS_GROW; ++braces_level; yy_push_state (SC_BRACED_CODE); /* A type. */ "<"[^>]+">" { obstack_grow (&string_obstack, yytext + 1, yyleng - 2); YY_OBS_FINISH; yylval->string = last_string; return TYPE; } "%%" { if (++percent_percent_count == 2) yy_push_state (SC_EPILOGUE); return PERCENT_PERCENT; } . { LOCATION_PRINT (stderr, *yylloc); fprintf (stderr, _(": invalid character: `%c'\n"), *yytext); YY_STEP; } } /*------------------------------------------------------------. | Whatever the start condition (but those which correspond to | | entity `swallowed' by Bison: SC_ESCAPED_STRING and | | SC_ESCAPED_CHARACTER), no M4 character must escape as is. | `------------------------------------------------------------*/ { \[ if (YY_START != SC_COMMENT) obstack_sgrow (&string_obstack, "@<:@"); \] if (YY_START != SC_COMMENT) obstack_sgrow (&string_obstack, "@:>@"); } /*-----------------------------------------------------------. | Scanning a C comment. The initial `/ *' is already eaten. | `-----------------------------------------------------------*/ { "*/" { /* End of the comment. */ if (yy_top_state () == INITIAL) { YY_STEP; } else { YY_OBS_GROW; } yy_pop_state (); } [^\[\]*\n\r]+ if (yy_top_state () != INITIAL) YY_OBS_GROW; {eols} if (yy_top_state () != INITIAL) YY_OBS_GROW; YY_LINES; . /* Stray `*'. */if (yy_top_state () != INITIAL) YY_OBS_GROW; <> { LOCATION_PRINT (stderr, *yylloc); fprintf (stderr, _(": unexpected end of file in a comment\n")); yy_pop_state (); } } /*----------------------------------------------------------------. | Scanning a C string, including its escapes. The initial `"' is | | already eaten. | `----------------------------------------------------------------*/ { "\"" { assert (yy_top_state () == INITIAL); YY_OBS_GROW; YY_OBS_FINISH; yylval->string = last_string; yy_pop_state (); rule_length++; return STRING; } [^\"\n\r\\]+ YY_OBS_GROW; {eols} obstack_1grow (&string_obstack, '\n'); YY_LINES; <> { LOCATION_PRINT (stderr, *yylloc); fprintf (stderr, _(": unexpected end of file in a string\n")); assert (yy_top_state () == INITIAL); YY_OBS_FINISH; yylval->string = last_string; yy_pop_state (); return STRING; } } /*---------------------------------------------------------------. | Scanning a C character, decoding its escapes. The initial "'" | | is already eaten. | `---------------------------------------------------------------*/ { "'" { YY_OBS_GROW; assert (yy_top_state () == INITIAL); { YY_OBS_FINISH; yylval->symbol = symbol_get (last_string, *yylloc); symbol_class_set (yylval->symbol, token_sym, *yylloc); symbol_user_token_number_set (yylval->symbol, (unsigned char) last_string[1], *yylloc); YY_OBS_FREE; yy_pop_state (); rule_length++; return ID; } } [^\n\r\\] YY_OBS_GROW; {eols} obstack_1grow (&string_obstack, '\n'); YY_LINES; <> { LOCATION_PRINT (stderr, *yylloc); fprintf (stderr, _(": unexpected end of file in a character\n")); assert (yy_top_state () == INITIAL); YY_OBS_FINISH; yylval->string = last_string; yy_pop_state (); return CHARACTER; } } /*----------------------------. | Decode escaped characters. | `----------------------------*/ { \\[0-7]{3} { long c = strtol (yytext + 1, 0, 8); if (c > 255) { LOCATION_PRINT (stderr, *yylloc); fprintf (stderr, _(": invalid escape: %s\n"), quote (yytext)); YY_STEP; } else obstack_1grow (&string_obstack, c); } \\x[0-9a-fA-F]{2} { obstack_1grow (&string_obstack, strtol (yytext + 2, 0, 16)); } \\a obstack_1grow (&string_obstack, '\a'); \\b obstack_1grow (&string_obstack, '\b'); \\f obstack_1grow (&string_obstack, '\f'); \\n obstack_1grow (&string_obstack, '\n'); \\r obstack_1grow (&string_obstack, '\r'); \\t obstack_1grow (&string_obstack, '\t'); \\v obstack_1grow (&string_obstack, '\v'); \\[\\""''] obstack_1grow (&string_obstack, yytext[1]); \\(.|\n) { LOCATION_PRINT (stderr, *yylloc); fprintf (stderr, _(": unrecognized escape: %s\n"), quote (yytext)); YY_OBS_GROW; } /* FLex wants this rule, in case of a `\<>'. */ \\ YY_OBS_GROW; } /*----------------------------------------------------------. | Scanning a C character without decoding its escapes. The | | initial "'" is already eaten. | `----------------------------------------------------------*/ { "'" { YY_OBS_GROW; assert (yy_top_state () != INITIAL); yy_pop_state (); } [^\[\]\'\n\r\\]+ YY_OBS_GROW; \\(.|\n) YY_OBS_GROW; /* FLex wants this rule, in case of a `\<>'. */ \\ YY_OBS_GROW; {eols} YY_OBS_GROW; YY_LINES; <> { LOCATION_PRINT (stderr, *yylloc); fprintf (stderr, _(": unexpected end of file in a character\n")); assert (yy_top_state () != INITIAL); yy_pop_state (); } } /*----------------------------------------------------------------. | Scanning a C string, without decoding its escapes. The initial | | `"' is already eaten. | `----------------------------------------------------------------*/ { "\"" { assert (yy_top_state () != INITIAL); YY_OBS_GROW; yy_pop_state (); } [^\[\]\"\n\r\\]+ YY_OBS_GROW; \\(.|\n) YY_OBS_GROW; /* FLex wants this rule, in case of a `\<>'. */ \\ YY_OBS_GROW; {eols} YY_OBS_GROW; YY_LINES; <> { LOCATION_PRINT (stderr, *yylloc); fprintf (stderr, _(": unexpected end of file in a string\n")); assert (yy_top_state () != INITIAL); yy_pop_state (); } } /*---------------------------------------------------. | Strings, comments etc. can be found in user code. | `---------------------------------------------------*/ { /* Characters. We don't check there is only one. */ "'" YY_OBS_GROW; yy_push_state (SC_CHARACTER); /* Strings. */ "\"" YY_OBS_GROW; yy_push_state (SC_STRING); /* Comments. */ "/*" YY_OBS_GROW; yy_push_state (SC_COMMENT); "//".* YY_OBS_GROW; /* Not comments. */ "/" YY_OBS_GROW; } /*---------------------------------------------------------------. | Scanning some code in braces (%union and actions). The initial | | "{" is already eaten. | `---------------------------------------------------------------*/ { "}" { YY_OBS_GROW; if (--braces_level == 0) { yy_pop_state (); YY_OBS_FINISH; yylval->string = last_string; rule_length++; return BRACED_CODE; } } "{" YY_OBS_GROW; braces_level++; "$"("<"[^>]+">")?(-?[0-9]+|"$") { handle_dollar (current_braced_code, yytext, *yylloc); } "@"(-?[0-9]+|"$") { handle_at (current_braced_code, yytext, *yylloc); } [^$@\[\]/\'\"\{\}\n\r]+ YY_OBS_GROW; {eols} YY_OBS_GROW; YY_LINES; /* A lose $, or /, or etc. */ . YY_OBS_GROW; <> { LOCATION_PRINT (stderr, *yylloc); fprintf (stderr, _(": unexpected end of file in a braced code\n")); yy_pop_state (); YY_OBS_FINISH; yylval->string = last_string; return BRACED_CODE; } } /*--------------------------------------------------------------. | Scanning some prologue: from "%{" (already scanned) to "%}". | `--------------------------------------------------------------*/ { "%}" { yy_pop_state (); YY_OBS_FINISH; yylval->string = last_string; return PROLOGUE; } [^%\[\]/\'\"\n\r]+ YY_OBS_GROW; "%" YY_OBS_GROW; {eols} YY_OBS_GROW; YY_LINES; <> { LOCATION_PRINT (stderr, *yylloc); fprintf (stderr, _(": unexpected end of file in a prologue\n")); yy_pop_state (); YY_OBS_FINISH; yylval->string = last_string; return PROLOGUE; } } /*---------------------------------------------------------------. | Scanning the epilogue (everything after the second "%%", which | | has already been eaten. | `---------------------------------------------------------------*/ { ([^\[\]]|{eols})+ YY_OBS_GROW; <> { yy_pop_state (); YY_OBS_FINISH; yylval->string = last_string; return EPILOGUE; } } %% /*------------------------------------------------------------------. | TEXT is pointing to a wannabee semantic value (i.e., a `$'). | | | | Possible inputs: $[]($|integer) | | | | Output to the STRING_OBSTACK a reference to this semantic value. | `------------------------------------------------------------------*/ static inline void handle_action_dollar (char *text, location_t location) { const char *type_name = NULL; char *cp = text + 1; /* Get the type name if explicit. */ if (*cp == '<') { type_name = ++cp; while (*cp != '>') ++cp; *cp = '\0'; ++cp; } if (*cp == '$') { if (!type_name) type_name = symbol_list_n_type_name_get (current_rule, location, 0); if (!type_name && typed) complain_at (location, _("$$ of `%s' has no declared type"), current_rule->sym->tag); if (!type_name) type_name = ""; obstack_fgrow1 (&string_obstack, "]b4_lhs_value([%s])[", type_name); } else if (('0' <= *cp && *cp <= '9') || *cp == '-') { int n = strtol (cp, &cp, 10); if (n > rule_length) complain_at (location, _("invalid value: %s%d"), "$", n); else { if (!type_name && n > 0) type_name = symbol_list_n_type_name_get (current_rule, location, n); if (!type_name && typed) complain_at (location, _("$%d of `%s' has no declared type"), n, current_rule->sym->tag); if (!type_name) type_name = ""; obstack_fgrow3 (&string_obstack, "]b4_rhs_value([%d], [%d], [%s])[", rule_length, n, type_name); } } else { complain_at (location, _("%s is invalid"), quote (text)); } } /*---------------------------------------------------------------. | TEXT is expexted tp be $$ in some code associated to a symbol: | | destructor or printer. | `---------------------------------------------------------------*/ static inline void handle_symbol_code_dollar (char *text, location_t location) { char *cp = text + 1; if (*cp == '$') obstack_sgrow (&string_obstack, "]b4_dollar_dollar["); else complain_at (location, _("%s is invalid"), quote (text)); } /*-----------------------------------------------------------------. | Dispatch onto handle_action_dollar, or handle_destructor_dollar, | | depending upon CODE_KIND. | `-----------------------------------------------------------------*/ static void handle_dollar (braced_code_t braced_code_kind, char *text, location_t location) { switch (braced_code_kind) { case action_braced_code: handle_action_dollar (text, location); break; case destructor_braced_code: case printer_braced_code: handle_symbol_code_dollar (text, location); break; } } /*------------------------------------------------------. | TEXT is a location token (i.e., a `@...'). Output to | | STRING_OBSTACK a reference to this location. | `------------------------------------------------------*/ static inline void handle_action_at (char *text, location_t location) { char *cp = text + 1; locations_flag = 1; if (*cp == '$') { obstack_sgrow (&string_obstack, "]b4_lhs_location["); } else if (('0' <= *cp && *cp <= '9') || *cp == '-') { int n = strtol (cp, &cp, 10); if (n > rule_length) complain_at (location, _("invalid value: %s%d"), "@", n); else obstack_fgrow2 (&string_obstack, "]b4_rhs_location([%d], [%d])[", rule_length, n); } else { complain_at (location, _("%s is invalid"), quote (text)); } } /*---------------------------------------------------------------. | TEXT is expexted tp be @$ in some code associated to a symbol: | | destructor or printer. | `---------------------------------------------------------------*/ static inline void handle_symbol_code_at (char *text, location_t location) { char *cp = text + 1; if (*cp == '$') obstack_sgrow (&string_obstack, "]b4_at_dollar["); else complain_at (location, _("%s is invalid"), quote (text)); } /*-------------------------------------------------------------------. | Dispatch onto handle_action_at, or handle_destructor_at, depending | | upon CODE_KIND. | `-------------------------------------------------------------------*/ static void handle_at (braced_code_t braced_code_kind, char *text, location_t location) { switch (braced_code_kind) { case action_braced_code: handle_action_at (text, location); break; case destructor_braced_code: case printer_braced_code: handle_symbol_code_at (text, location); break; } } /*-------------------------. | Initialize the scanner. | `-------------------------*/ void scanner_initialize (void) { obstack_init (&string_obstack); } /*-----------------------------------------------. | Free all the memory allocated to the scanner. | `-----------------------------------------------*/ void scanner_free (void) { obstack_free (&string_obstack, 0); /* Reclaim Flex's buffers. */ yy_delete_buffer (YY_CURRENT_BUFFER); }