#line 1 "lex.yy.c" #line 3 "lex.yy.c" #define YY_INT_ALIGNED short int /* A lexical scanner generated by flex */ #define FLEX_SCANNER #define YY_FLEX_MAJOR_VERSION 2 #define YY_FLEX_MINOR_VERSION 6 #define YY_FLEX_SUBMINOR_VERSION 4 #if YY_FLEX_SUBMINOR_VERSION > 0 #define FLEX_BETA #endif /* First, we deal with platform-specific or compiler-specific issues. */ /* begin standard C headers. */ #include #include #include #include /* end standard C headers. */ /* flex integer type definitions */ #ifndef FLEXINT_H #define FLEXINT_H /* C99 systems have . Non-C99 systems may or may not. */ #if defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L /* C99 says to define __STDC_LIMIT_MACROS before including stdint.h, * if you want the limit (max/min) macros for int types. */ #ifndef __STDC_LIMIT_MACROS #define __STDC_LIMIT_MACROS 1 #endif #include typedef int8_t flex_int8_t; typedef uint8_t flex_uint8_t; typedef int16_t flex_int16_t; typedef uint16_t flex_uint16_t; typedef int32_t flex_int32_t; typedef uint32_t flex_uint32_t; #else typedef signed char flex_int8_t; typedef short int flex_int16_t; typedef int flex_int32_t; typedef unsigned char flex_uint8_t; typedef unsigned short int flex_uint16_t; typedef unsigned int flex_uint32_t; /* Limits of integral types. */ #ifndef INT8_MIN #define INT8_MIN (-128) #endif #ifndef INT16_MIN #define INT16_MIN (-32767-1) #endif #ifndef INT32_MIN #define INT32_MIN (-2147483647-1) #endif #ifndef INT8_MAX #define INT8_MAX (127) #endif #ifndef INT16_MAX #define INT16_MAX (32767) #endif #ifndef INT32_MAX #define INT32_MAX (2147483647) #endif #ifndef UINT8_MAX #define UINT8_MAX (255U) #endif #ifndef UINT16_MAX #define UINT16_MAX (65535U) #endif #ifndef UINT32_MAX #define UINT32_MAX (4294967295U) #endif #ifndef SIZE_MAX #define SIZE_MAX (~(size_t)0) #endif #endif /* ! C99 */ #endif /* ! FLEXINT_H */ /* begin standard C++ headers. */ /* TODO: this is always defined, so inline it */ #define yyconst const #if defined(__GNUC__) && __GNUC__ >= 3 #define yynoreturn __attribute__((__noreturn__)) #else #define yynoreturn #endif /* Returned upon end-of-file. */ #define YY_NULL 0 /* Promotes a possibly negative, possibly signed char to an * integer in range [0..255] for use as an array index. */ #define YY_SC_TO_UI(c) ((YY_CHAR) (c)) /* Enter a start condition. This macro really ought to take a parameter, * but we do it the disgusting crufty way forced on us by the ()-less * definition of BEGIN. */ #define BEGIN (yy_start) = 1 + 2 * /* Translate the current start state into a value that can be later handed * to BEGIN to return to the state. The YYSTATE alias is for lex * compatibility. */ #define YY_START (((yy_start) - 1) / 2) #define YYSTATE YY_START /* Action number for EOF rule of a given start state. */ #define YY_STATE_EOF(state) (YY_END_OF_BUFFER + state + 1) /* Special action meaning "start processing a new file". */ #define YY_NEW_FILE yyrestart( yyin ) #define YY_END_OF_BUFFER_CHAR 0 /* Size of default input buffer. */ #ifndef YY_BUF_SIZE #ifdef __ia64__ /* On IA-64, the buffer size is 16k, not 8k. * Moreover, YY_BUF_SIZE is 2*YY_READ_BUF_SIZE in the general case. * Ditto for the __ia64__ case accordingly. */ #define YY_BUF_SIZE 32768 #else #define YY_BUF_SIZE 16384 #endif /* __ia64__ */ #endif /* The state buf must be large enough to hold one state per character in the main buffer. */ #define YY_STATE_BUF_SIZE ((YY_BUF_SIZE + 2) * sizeof(yy_state_type)) #ifndef YY_TYPEDEF_YY_BUFFER_STATE #define YY_TYPEDEF_YY_BUFFER_STATE typedef struct yy_buffer_state *YY_BUFFER_STATE; #endif #ifndef YY_TYPEDEF_YY_SIZE_T #define YY_TYPEDEF_YY_SIZE_T typedef size_t yy_size_t; #endif extern int yyleng; extern FILE *yyin, *yyout; #define EOB_ACT_CONTINUE_SCAN 0 #define EOB_ACT_END_OF_FILE 1 #define EOB_ACT_LAST_MATCH 2 #define YY_LESS_LINENO(n) #define YY_LINENO_REWIND_TO(ptr) /* Return all but the first "n" matched characters back to the input stream. */ #define yyless(n) \ do \ { \ /* Undo effects of setting up yytext. */ \ int yyless_macro_arg = (n); \ YY_LESS_LINENO(yyless_macro_arg);\ *yy_cp = (yy_hold_char); \ YY_RESTORE_YY_MORE_OFFSET \ (yy_c_buf_p) = yy_cp = yy_bp + yyless_macro_arg - YY_MORE_ADJ; \ YY_DO_BEFORE_ACTION; /* set up yytext again */ \ } \ while ( 0 ) #define unput(c) yyunput( c, (yytext_ptr) ) #ifndef YY_STRUCT_YY_BUFFER_STATE #define YY_STRUCT_YY_BUFFER_STATE struct yy_buffer_state { FILE *yy_input_file; char *yy_ch_buf; /* input buffer */ char *yy_buf_pos; /* current position in input buffer */ /* Size of input buffer in bytes, not including room for EOB * characters. */ int yy_buf_size; /* Number of characters read into yy_ch_buf, not including EOB * characters. */ int yy_n_chars; /* Whether we "own" the buffer - i.e., we know we created it, * and can realloc() it to grow it, and should free() it to * delete it. */ int yy_is_our_buffer; /* Whether this is an "interactive" input source; if so, and * if we're using stdio for input, then we want to use getc() * instead of fread(), to make sure we stop fetching input after * each newline. */ int yy_is_interactive; /* Whether we're considered to be at the beginning of a line. * If so, '^' rules will be active on the next match, otherwise * not. */ int yy_at_bol; int yy_bs_lineno; /**< The line count. */ int yy_bs_column; /**< The column count. */ /* Whether to try to fill the input buffer when we reach the * end of it. */ int yy_fill_buffer; int yy_buffer_status; #define YY_BUFFER_NEW 0 #define YY_BUFFER_NORMAL 1 /* When an EOF's been seen but there's still some text to process * then we mark the buffer as YY_EOF_PENDING, to indicate that we * shouldn't try reading from the input source any more. We might * still have a bunch of tokens to match, though, because of * possible backing-up. * * When we actually see the EOF, we change the status to "new" * (via yyrestart()), so that the user can continue scanning by * just pointing yyin at a new input file. */ #define YY_BUFFER_EOF_PENDING 2 }; #endif /* !YY_STRUCT_YY_BUFFER_STATE */ /* Stack of input buffers. */ static size_t yy_buffer_stack_top = 0; /**< index of top of stack. */ static size_t yy_buffer_stack_max = 0; /**< capacity of stack. */ static YY_BUFFER_STATE * yy_buffer_stack = NULL; /**< Stack as an array. */ /* We provide macros for accessing buffer states in case in the * future we want to put the buffer states in a more general * "scanner state". * * Returns the top of the stack, or NULL. */ #define YY_CURRENT_BUFFER ( (yy_buffer_stack) \ ? (yy_buffer_stack)[(yy_buffer_stack_top)] \ : NULL) /* Same as previous macro, but useful when we know that the buffer stack is not * NULL or when we need an lvalue. For internal use only. */ #define YY_CURRENT_BUFFER_LVALUE (yy_buffer_stack)[(yy_buffer_stack_top)] /* yy_hold_char holds the character lost when yytext is formed. */ static char yy_hold_char; static int yy_n_chars; /* number of characters read into yy_ch_buf */ int yyleng; /* Points to current character in buffer. */ static char *yy_c_buf_p = NULL; static int yy_init = 0; /* whether we need to initialize */ static int yy_start = 0; /* start state number */ /* Flag which is used to allow yywrap()'s to do buffer switches * instead of setting up a fresh yyin. A bit of a hack ... */ static int yy_did_buffer_switch_on_eof; void yyrestart ( FILE *input_file ); void yy_switch_to_buffer ( YY_BUFFER_STATE new_buffer ); YY_BUFFER_STATE yy_create_buffer ( FILE *file, int size ); void yy_delete_buffer ( YY_BUFFER_STATE b ); void yy_flush_buffer ( YY_BUFFER_STATE b ); void yypush_buffer_state ( YY_BUFFER_STATE new_buffer ); void yypop_buffer_state ( void ); static void yyensure_buffer_stack ( void ); static void yy_load_buffer_state ( void ); static void yy_init_buffer ( YY_BUFFER_STATE b, FILE *file ); #define YY_FLUSH_BUFFER yy_flush_buffer( YY_CURRENT_BUFFER ) YY_BUFFER_STATE yy_scan_buffer ( char *base, yy_size_t size ); YY_BUFFER_STATE yy_scan_string ( const char *yy_str ); YY_BUFFER_STATE yy_scan_bytes ( const char *bytes, int len ); void *yyalloc ( yy_size_t ); void *yyrealloc ( void *, yy_size_t ); void yyfree ( void * ); #define yy_new_buffer yy_create_buffer #define yy_set_interactive(is_interactive) \ { \ if ( ! YY_CURRENT_BUFFER ){ \ yyensure_buffer_stack (); \ YY_CURRENT_BUFFER_LVALUE = \ yy_create_buffer( yyin, YY_BUF_SIZE ); \ } \ YY_CURRENT_BUFFER_LVALUE->yy_is_interactive = is_interactive; \ } #define yy_set_bol(at_bol) \ { \ if ( ! YY_CURRENT_BUFFER ){\ yyensure_buffer_stack (); \ YY_CURRENT_BUFFER_LVALUE = \ yy_create_buffer( yyin, YY_BUF_SIZE ); \ } \ YY_CURRENT_BUFFER_LVALUE->yy_at_bol = at_bol; \ } #define YY_AT_BOL() (YY_CURRENT_BUFFER_LVALUE->yy_at_bol) /* Begin user sect3 */ #define yywrap() (/*CONSTCOND*/1) #define YY_SKIP_YYWRAP typedef flex_uint8_t YY_CHAR; FILE *yyin = NULL, *yyout = NULL; typedef int yy_state_type; extern int yylineno; int yylineno = 1; extern char *yytext; #ifdef yytext_ptr #undef yytext_ptr #endif #define yytext_ptr yytext static yy_state_type yy_get_previous_state ( void ); static yy_state_type yy_try_NUL_trans ( yy_state_type current_state ); static int yy_get_next_buffer ( void ); static void yynoreturn yy_fatal_error ( const char* msg ); /* Done after the current pattern has been matched and before the * corresponding action - sets up yytext. */ #define YY_DO_BEFORE_ACTION \ (yytext_ptr) = yy_bp; \ yyleng = (int) (yy_cp - yy_bp); \ (yy_hold_char) = *yy_cp; \ *yy_cp = '\0'; \ (yy_c_buf_p) = yy_cp; #define YY_NUM_RULES 50 #define YY_END_OF_BUFFER 51 /* This struct is not used in this scanner, but its presence is necessary. */ struct yy_trans_info { flex_int32_t yy_verify; flex_int32_t yy_nxt; }; static const flex_int16_t yy_accept[139] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 51, 49, 2, 2, 35, 43, 44, 41, 39, 45, 40, 47, 42, 29, 48, 46, 37, 36, 38, 28, 31, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 8, 49, 49, 49, 49, 6, 7, 10, 9, 13, 14, 2, 11, 4, 3, 29, 30, 0, 0, 0, 32, 33, 34, 28, 31, 0, 0, 0, 28, 28, 28, 25, 28, 21, 28, 28, 28, 28, 28, 28, 28, 31, 0, 0, 0, 6, 5, 10, 13, 12, 3, 30, 0, 0, 0, 30, 0, 0, 31, 0, 0, 28, 28, 28, 19, 20, 28, 28, 28, 16, 28, 28, 1, 0, 30, 0, 0, 0, 0, 28, 23, 28, 28, 26, 22, 28, 28, 0, 18, 15, 28, 24, 27, 28, 28, 28, 17, 0 } ; static const YY_CHAR yy_ec[256] = { 0, 1, 1, 1, 1, 1, 1, 1, 1, 2, 3, 2, 2, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 5, 1, 1, 1, 1, 6, 7, 8, 9, 10, 11, 12, 13, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 15, 16, 17, 18, 19, 1, 1, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 1, 1, 1, 1, 21, 1, 22, 23, 24, 25, 26, 27, 28, 29, 30, 20, 20, 31, 20, 32, 33, 34, 20, 35, 36, 37, 38, 39, 40, 20, 20, 20, 41, 1, 42, 1, 1, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 44, 43, 43, 43, 45, 1, 1, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 47, 47, 47, 47, 47, 47, 47, 47, 47, 47, 47, 47, 47, 47, 47, 48, 49, 49, 49, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 } ; static const YY_CHAR yy_meta[50] = { 0, 1, 1, 2, 2, 1, 1, 1, 3, 1, 1, 1, 1, 1, 4, 1, 1, 1, 1, 1, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 5, 1, 1, 1, 4, 4, 4, 4 } ; static const flex_int16_t yy_base[150] = { 0, 0, 0, 321, 320, 285, 284, 317, 316, 323, 330, 48, 51, 330, 314, 330, 330, 330, 330, 330, 330, 48, 43, 303, 330, 302, 330, 301, 37, 16, 47, 44, 34, 43, 45, 53, 62, 292, 72, 54, 73, 330, 60, 66, 69, 72, 0, 304, 0, 330, 0, 309, 116, 330, 330, 0, 86, 75, 82, 85, 93, 330, 330, 330, 289, 93, 100, 103, 106, 126, 56, 127, 288, 81, 287, 130, 48, 135, 286, 132, 134, 136, 122, 129, 132, 135, 0, 330, 0, 0, 330, 0, 135, 142, 145, 148, 148, 155, 158, 158, 165, 168, 188, 189, 190, 285, 284, 139, 196, 191, 283, 193, 199, 181, 188, 191, 198, 201, 204, 207, 227, 282, 228, 281, 280, 279, 275, 271, 212, 262, 242, 209, 241, 240, 232, 234, 238, 237, 330, 270, 275, 280, 258, 257, 127, 285, 290, 294, 299, 55 } ; static const flex_int16_t yy_def[150] = { 0, 138, 1, 139, 139, 140, 140, 141, 141, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 142, 138, 138, 138, 138, 138, 143, 144, 143, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 138, 138, 138, 138, 138, 145, 138, 146, 138, 147, 138, 138, 138, 138, 148, 142, 149, 138, 138, 138, 138, 138, 138, 30, 144, 138, 138, 138, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 144, 138, 138, 138, 145, 138, 146, 147, 138, 148, 149, 138, 138, 138, 149, 138, 138, 144, 138, 138, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 144, 138, 149, 138, 138, 138, 138, 30, 30, 30, 30, 30, 30, 30, 30, 138, 30, 30, 30, 30, 30, 30, 30, 30, 30, 0, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138 } ; static const flex_int16_t yy_nxt[380] = { 0, 10, 11, 12, 11, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 28, 30, 31, 32, 33, 28, 28, 28, 34, 28, 28, 35, 36, 37, 28, 38, 28, 39, 40, 41, 10, 10, 10, 10, 42, 43, 44, 45, 52, 52, 52, 52, 52, 52, 54, 56, 65, 92, 64, 55, 66, 67, 67, 68, 70, 72, 65, 64, 64, 64, 74, 69, 64, 73, 79, 71, 75, 64, 64, 107, 64, 66, 67, 67, 68, 103, 64, 58, 59, 59, 60, 66, 67, 67, 68, 76, 64, 64, 56, 78, 80, 82, 82, 82, 105, 64, 81, 83, 83, 83, 83, 84, 83, 85, 85, 85, 52, 52, 52, 93, 94, 94, 95, 96, 96, 96, 97, 97, 97, 65, 58, 59, 59, 60, 98, 98, 98, 66, 67, 67, 68, 99, 99, 99, 100, 100, 100, 101, 101, 101, 64, 64, 102, 106, 64, 108, 64, 104, 64, 64, 64, 123, 111, 64, 112, 110, 66, 67, 67, 68, 82, 82, 82, 82, 82, 113, 114, 114, 114, 93, 94, 94, 95, 115, 115, 115, 116, 116, 116, 117, 117, 117, 93, 94, 94, 95, 96, 96, 96, 118, 118, 118, 66, 67, 67, 68, 99, 99, 99, 119, 119, 119, 64, 64, 64, 64, 120, 64, 121, 124, 64, 125, 126, 64, 122, 66, 67, 67, 68, 82, 82, 82, 134, 64, 127, 93, 94, 94, 95, 115, 115, 115, 128, 128, 128, 96, 96, 96, 99, 99, 99, 64, 64, 115, 115, 115, 64, 129, 64, 64, 57, 64, 137, 130, 64, 64, 64, 136, 135, 46, 46, 46, 46, 46, 48, 48, 48, 48, 48, 50, 50, 50, 50, 50, 86, 86, 64, 86, 86, 88, 88, 88, 88, 89, 89, 133, 89, 89, 91, 132, 91, 91, 91, 64, 64, 131, 64, 64, 64, 64, 109, 64, 64, 64, 90, 87, 77, 63, 62, 61, 53, 138, 51, 51, 49, 49, 47, 47, 9, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138 } ; static const flex_int16_t yy_chk[380] = { 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 11, 11, 11, 12, 12, 12, 21, 22, 28, 149, 32, 21, 29, 29, 29, 29, 31, 32, 30, 33, 31, 34, 34, 30, 76, 33, 39, 31, 35, 35, 39, 76, 70, 28, 28, 28, 28, 70, 36, 22, 22, 22, 22, 30, 30, 30, 30, 36, 38, 40, 56, 38, 40, 42, 42, 42, 73, 73, 40, 43, 43, 43, 44, 44, 44, 45, 45, 45, 52, 52, 52, 57, 57, 57, 57, 58, 58, 58, 59, 59, 59, 144, 56, 56, 56, 56, 60, 60, 60, 65, 65, 65, 65, 66, 66, 66, 67, 67, 67, 68, 68, 68, 69, 71, 69, 75, 75, 77, 79, 71, 80, 77, 81, 107, 80, 107, 81, 79, 82, 82, 82, 82, 83, 83, 83, 84, 84, 84, 85, 85, 85, 92, 92, 92, 92, 93, 93, 93, 94, 94, 94, 95, 95, 95, 96, 96, 96, 96, 97, 97, 97, 98, 98, 98, 99, 99, 99, 99, 100, 100, 100, 101, 101, 101, 102, 103, 104, 109, 102, 111, 103, 108, 108, 109, 111, 112, 104, 113, 113, 113, 113, 114, 114, 114, 131, 131, 112, 115, 115, 115, 115, 116, 116, 116, 117, 117, 117, 118, 118, 118, 119, 119, 119, 120, 122, 128, 128, 128, 134, 120, 135, 143, 142, 137, 136, 122, 133, 132, 130, 135, 134, 139, 139, 139, 139, 139, 140, 140, 140, 140, 140, 141, 141, 141, 141, 141, 145, 145, 129, 145, 145, 146, 146, 146, 146, 147, 147, 127, 147, 147, 148, 126, 148, 148, 148, 125, 124, 123, 121, 110, 106, 105, 78, 74, 72, 64, 51, 47, 37, 27, 25, 23, 14, 9, 8, 7, 6, 5, 4, 3, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138 } ; static yy_state_type yy_last_accepting_state; static char *yy_last_accepting_cpos; extern int yy_flex_debug; int yy_flex_debug = 0; /* The intent behind this definition is that it'll catch * any uses of REJECT which flex missed. */ #define REJECT reject_used_but_not_detected #define yymore() yymore_used_but_not_detected #define YY_MORE_ADJ 0 #define YY_RESTORE_YY_MORE_OFFSET char *yytext; #line 1 "pl0.l" #define YY_NO_INPUT 1 #line 4 "pl0.l" #include #include #include #include #ifdef _WIN32 #include #include #endif typedef struct { size_t start, end; int line, column; } Span; typedef struct { const char *type; int code; Span span; } Token; typedef struct { const char *message; Span span; } Diagnostic; typedef struct { const char *rule, *kind, *before, *after; int rule_line; Span span; long token, error; } Event; enum { T_CONST = 1, T_VAR, T_PROCEDURE, T_BEGIN, T_END, T_ODD, T_IF, T_THEN, T_CALL, T_WHILE, T_DO, T_READ, T_WRITE, T_IDENT = 20, T_NUMBER, T_ASSIGN = 30, T_LE, T_GE, T_NE, T_EQ, T_LT, T_GT, T_PLUS, T_MINUS, T_MULTIPLY, T_DIVIDE, T_LPAREN = 50, T_RPAREN, T_COMMA, T_SEMICOLON, T_DOT }; static char *source; static size_t source_length, offset; static int source_line = 1, source_column = 1, previous_cr; static Span match_span, comment_open; static Token *tokens; static Diagnostic *errors; static Event *events; static size_t token_count, token_capacity, error_count, error_capacity; static size_t event_count, event_capacity; static void fatal(const char *message); static void locate_match(const char *text, size_t length); static const char *state_name(int state); static void event(const char *rule, int rule_line, const char *kind, const char *before, const char *after, Span span, long token, long error); static void token(const char *type, int code, const char *rule, int rule_line); static void error(const char *message, const char *rule, int rule_line, const char *state, Span span); static void finish_comment(const char *message, const char *state, int rule_line); #define YY_USER_ACTION locate_match(yytext, (size_t)yyleng); #define TOKEN(type, code, rule) token(type, code, rule, __LINE__) #define SKIP(rule) event(rule, __LINE__, "skip", state_name(YY_START), state_name(YY_START), match_span, -1, -1) #define OPEN(rule, next) do { comment_open = match_span; event(rule, __LINE__, "state", "INITIAL", #next, match_span, -1, -1); BEGIN(next); } while (0) #define CLOSE(rule) do { event(rule, __LINE__, "state", state_name(YY_START), "INITIAL", match_span, -1, -1); BEGIN(INITIAL); } while (0) #line 642 "lex.yy.c" #line 643 "lex.yy.c" #define INITIAL 0 #define BLOCK_COMMENT 1 #define BRACE_COMMENT 2 #define PAREN_COMMENT 3 #ifndef YY_NO_UNISTD_H /* Special case for "unistd.h", since it is non-ANSI. We include it way * down here because we want the user's section 1 to have been scanned first. * The user has a chance to override it with an option. */ #include #endif #ifndef YY_EXTRA_TYPE #define YY_EXTRA_TYPE void * #endif static int yy_init_globals ( void ); /* Accessor methods to globals. These are made visible to non-reentrant scanners for convenience. */ int yylex_destroy ( void ); int yyget_debug ( void ); void yyset_debug ( int debug_flag ); YY_EXTRA_TYPE yyget_extra ( void ); void yyset_extra ( YY_EXTRA_TYPE user_defined ); FILE *yyget_in ( void ); void yyset_in ( FILE * _in_str ); FILE *yyget_out ( void ); void yyset_out ( FILE * _out_str ); int yyget_leng ( void ); char *yyget_text ( void ); int yyget_lineno ( void ); void yyset_lineno ( int _line_number ); /* Macros after this point can all be overridden by user definitions in * section 1. */ #ifndef YY_SKIP_YYWRAP #ifdef __cplusplus extern "C" int yywrap ( void ); #else extern int yywrap ( void ); #endif #endif #ifndef YY_NO_UNPUT #endif #ifndef yytext_ptr static void yy_flex_strncpy ( char *, const char *, int ); #endif #ifdef YY_NEED_STRLEN static int yy_flex_strlen ( const char * ); #endif #ifndef YY_NO_INPUT #ifdef __cplusplus static int yyinput ( void ); #else static int input ( void ); #endif #endif /* Amount of stuff to slurp up with each read. */ #ifndef YY_READ_BUF_SIZE #ifdef __ia64__ /* On IA-64, the buffer size is 16k, not 8k */ #define YY_READ_BUF_SIZE 16384 #else #define YY_READ_BUF_SIZE 8192 #endif /* __ia64__ */ #endif /* Copy whatever the last rule matched to the standard output. */ #ifndef ECHO /* This used to be an fputs(), but since the string might contain NUL's, * we now use fwrite(). */ #define ECHO do { if (fwrite( yytext, (size_t) yyleng, 1, yyout )) {} } while (0) #endif /* Gets input and stuffs it into "buf". number of characters read, or YY_NULL, * is returned in "result". */ #ifndef YY_INPUT #define YY_INPUT(buf,result,max_size) \ if ( YY_CURRENT_BUFFER_LVALUE->yy_is_interactive ) \ { \ int c = '*'; \ int n; \ for ( n = 0; n < max_size && \ (c = getc( yyin )) != EOF && c != '\n'; ++n ) \ buf[n] = (char) c; \ if ( c == '\n' ) \ buf[n++] = (char) c; \ if ( c == EOF && ferror( yyin ) ) \ YY_FATAL_ERROR( "input in flex scanner failed" ); \ result = n; \ } \ else \ { \ errno=0; \ while ( (result = (int) fread(buf, 1, (yy_size_t) max_size, yyin)) == 0 && ferror(yyin)) \ { \ if( errno != EINTR) \ { \ YY_FATAL_ERROR( "input in flex scanner failed" ); \ break; \ } \ errno=0; \ clearerr(yyin); \ } \ }\ \ #endif /* No semi-colon after return; correct usage is to write "yyterminate();" - * we don't want an extra ';' after the "return" because that will cause * some compilers to complain about unreachable statements. */ #ifndef yyterminate #define yyterminate() return YY_NULL #endif /* Number of entries by which start-condition stack grows. */ #ifndef YY_START_STACK_INCR #define YY_START_STACK_INCR 25 #endif /* Report a fatal error. */ #ifndef YY_FATAL_ERROR #define YY_FATAL_ERROR(msg) yy_fatal_error( msg ) #endif /* end tables serialization structures and prototypes */ /* Default declaration of generated scanner - a define so the user can * easily add parameters. */ #ifndef YY_DECL #define YY_DECL_IS_OURS 1 extern int yylex (void); #define YY_DECL int yylex (void) #endif /* !YY_DECL */ /* Code executed at the beginning of each rule, after yytext and yyleng * have been set up. */ #ifndef YY_USER_ACTION #define YY_USER_ACTION #endif /* Code executed at the end of each rule. */ #ifndef YY_BREAK #define YY_BREAK /*LINTED*/break; #endif #define YY_RULE_SETUP \ YY_USER_ACTION /** The main scanner function which does all the work. */ YY_DECL { yy_state_type yy_current_state; char *yy_cp, *yy_bp; int yy_act; if ( !(yy_init) ) { (yy_init) = 1; #ifdef YY_USER_INIT YY_USER_INIT; #endif if ( ! (yy_start) ) (yy_start) = 1; /* first start state */ if ( ! yyin ) yyin = stdin; if ( ! yyout ) yyout = stdout; if ( ! YY_CURRENT_BUFFER ) { yyensure_buffer_stack (); YY_CURRENT_BUFFER_LVALUE = yy_create_buffer( yyin, YY_BUF_SIZE ); } yy_load_buffer_state( ); } { #line 79 "pl0.l" #line 864 "lex.yy.c" while ( /*CONSTCOND*/1 ) /* loops until end-of-file is reached */ { yy_cp = (yy_c_buf_p); /* Support of yytext. */ *yy_cp = (yy_hold_char); /* yy_bp points to the position in yy_ch_buf of the start of * the current run. */ yy_bp = yy_cp; yy_current_state = (yy_start); yy_match: do { YY_CHAR yy_c = yy_ec[YY_SC_TO_UI(*yy_cp)] ; if ( yy_accept[yy_current_state] ) { (yy_last_accepting_state) = yy_current_state; (yy_last_accepting_cpos) = yy_cp; } while ( yy_chk[yy_base[yy_current_state] + yy_c] != yy_current_state ) { yy_current_state = (int) yy_def[yy_current_state]; if ( yy_current_state >= 139 ) yy_c = yy_meta[yy_c]; } yy_current_state = yy_nxt[yy_base[yy_current_state] + yy_c]; ++yy_cp; } while ( yy_current_state != 138 ); yy_cp = (yy_last_accepting_cpos); yy_current_state = (yy_last_accepting_state); yy_find_action: yy_act = yy_accept[yy_current_state]; YY_DO_BEFORE_ACTION; do_action: /* This label is used only to access EOF actions. */ switch ( yy_act ) { /* beginning of action switch */ case 0: /* must back up */ /* undo the effects of YY_DO_BEFORE_ACTION */ *yy_cp = (yy_hold_char); yy_cp = (yy_last_accepting_cpos); yy_current_state = (yy_last_accepting_state); goto yy_find_action; case 1: YY_RULE_SETUP #line 81 "pl0.l" { if (match_span.start == 0) { source_column = 1; SKIP("bom"); } else error("Unexpected UTF-8 BOM", "invalid", __LINE__, "INITIAL", match_span); } YY_BREAK case 2: /* rule 2 can match eol */ YY_RULE_SETUP #line 82 "pl0.l" { SKIP("whitespace"); } YY_BREAK case 3: YY_RULE_SETUP #line 83 "pl0.l" { SKIP("line-comment"); } YY_BREAK case 4: YY_RULE_SETUP #line 84 "pl0.l" { OPEN("comment-open", BLOCK_COMMENT); } YY_BREAK case 5: YY_RULE_SETUP #line 85 "pl0.l" { CLOSE("comment-close"); } YY_BREAK case 6: /* rule 6 can match eol */ YY_RULE_SETUP #line 86 "pl0.l" { SKIP("comment-body"); } YY_BREAK case 7: YY_RULE_SETUP #line 87 "pl0.l" { SKIP("comment-star"); } YY_BREAK case YY_STATE_EOF(BLOCK_COMMENT): #line 88 "pl0.l" { finish_comment("Unterminated comment: expected */", "BLOCK_COMMENT", __LINE__); BEGIN(INITIAL); yyterminate(); } YY_BREAK case 8: YY_RULE_SETUP #line 89 "pl0.l" { OPEN("brace-open", BRACE_COMMENT); } YY_BREAK case 9: YY_RULE_SETUP #line 90 "pl0.l" { CLOSE("brace-close"); } YY_BREAK case 10: /* rule 10 can match eol */ YY_RULE_SETUP #line 91 "pl0.l" { SKIP("brace-body"); } YY_BREAK case YY_STATE_EOF(BRACE_COMMENT): #line 92 "pl0.l" { finish_comment("Unterminated comment: expected }", "BRACE_COMMENT", __LINE__); BEGIN(INITIAL); yyterminate(); } YY_BREAK case 11: YY_RULE_SETUP #line 93 "pl0.l" { OPEN("paren-open", PAREN_COMMENT); } YY_BREAK case 12: YY_RULE_SETUP #line 94 "pl0.l" { CLOSE("paren-close"); } YY_BREAK case 13: /* rule 13 can match eol */ YY_RULE_SETUP #line 95 "pl0.l" { SKIP("paren-body"); } YY_BREAK case 14: YY_RULE_SETUP #line 96 "pl0.l" { SKIP("paren-star"); } YY_BREAK case YY_STATE_EOF(PAREN_COMMENT): #line 97 "pl0.l" { finish_comment("Unterminated comment: expected *)", "PAREN_COMMENT", __LINE__); BEGIN(INITIAL); yyterminate(); } YY_BREAK case 15: YY_RULE_SETUP #line 99 "pl0.l" { TOKEN("CONST", T_CONST, "kw-const"); } YY_BREAK case 16: YY_RULE_SETUP #line 100 "pl0.l" { TOKEN("VAR", T_VAR, "kw-var"); } YY_BREAK case 17: YY_RULE_SETUP #line 101 "pl0.l" { TOKEN("PROCEDURE", T_PROCEDURE, "kw-procedure"); } YY_BREAK case 18: YY_RULE_SETUP #line 102 "pl0.l" { TOKEN("BEGIN", T_BEGIN, "kw-begin"); } YY_BREAK case 19: YY_RULE_SETUP #line 103 "pl0.l" { TOKEN("END", T_END, "kw-end"); } YY_BREAK case 20: YY_RULE_SETUP #line 104 "pl0.l" { TOKEN("ODD", T_ODD, "kw-odd"); } YY_BREAK case 21: YY_RULE_SETUP #line 105 "pl0.l" { TOKEN("IF", T_IF, "kw-if"); } YY_BREAK case 22: YY_RULE_SETUP #line 106 "pl0.l" { TOKEN("THEN", T_THEN, "kw-then"); } YY_BREAK case 23: YY_RULE_SETUP #line 107 "pl0.l" { TOKEN("CALL", T_CALL, "kw-call"); } YY_BREAK case 24: YY_RULE_SETUP #line 108 "pl0.l" { TOKEN("WHILE", T_WHILE, "kw-while"); } YY_BREAK case 25: YY_RULE_SETUP #line 109 "pl0.l" { TOKEN("DO", T_DO, "kw-do"); } YY_BREAK case 26: YY_RULE_SETUP #line 110 "pl0.l" { TOKEN("READ", T_READ, "kw-read"); } YY_BREAK case 27: YY_RULE_SETUP #line 111 "pl0.l" { TOKEN("WRITE", T_WRITE, "kw-write"); } YY_BREAK case 28: YY_RULE_SETUP #line 112 "pl0.l" { TOKEN("IDENT", T_IDENT, "identifier"); } YY_BREAK case 29: YY_RULE_SETUP #line 113 "pl0.l" { TOKEN("NUMBER", T_NUMBER, "number"); } YY_BREAK case 30: YY_RULE_SETUP #line 114 "pl0.l" { error("Invalid number or identifier: starts with a digit", "invalid-number", __LINE__, "INITIAL", match_span); } YY_BREAK case 31: YY_RULE_SETUP #line 115 "pl0.l" { error("Invalid identifier: expected [A-Za-z][A-Za-z0-9]*", "invalid-identifier", __LINE__, "INITIAL", match_span); } YY_BREAK case 32: YY_RULE_SETUP #line 117 "pl0.l" { TOKEN(":=", T_ASSIGN, "assign"); } YY_BREAK case 33: YY_RULE_SETUP #line 118 "pl0.l" { TOKEN("<=", T_LE, "less-equal"); } YY_BREAK case 34: YY_RULE_SETUP #line 119 "pl0.l" { TOKEN(">=", T_GE, "greater-equal"); } YY_BREAK case 35: YY_RULE_SETUP #line 120 "pl0.l" { TOKEN("#", T_NE, "not-equal"); } YY_BREAK case 36: YY_RULE_SETUP #line 121 "pl0.l" { TOKEN("=", T_EQ, "equal"); } YY_BREAK case 37: YY_RULE_SETUP #line 122 "pl0.l" { TOKEN("<", T_LT, "less"); } YY_BREAK case 38: YY_RULE_SETUP #line 123 "pl0.l" { TOKEN(">", T_GT, "greater"); } YY_BREAK case 39: YY_RULE_SETUP #line 124 "pl0.l" { TOKEN("+", T_PLUS, "plus"); } YY_BREAK case 40: YY_RULE_SETUP #line 125 "pl0.l" { TOKEN("-", T_MINUS, "minus"); } YY_BREAK case 41: YY_RULE_SETUP #line 126 "pl0.l" { TOKEN("*", T_MULTIPLY, "multiply"); } YY_BREAK case 42: YY_RULE_SETUP #line 127 "pl0.l" { TOKEN("/", T_DIVIDE, "divide"); } YY_BREAK case 43: YY_RULE_SETUP #line 128 "pl0.l" { TOKEN("(", T_LPAREN, "left-paren"); } YY_BREAK case 44: YY_RULE_SETUP #line 129 "pl0.l" { TOKEN(")", T_RPAREN, "right-paren"); } YY_BREAK case 45: YY_RULE_SETUP #line 130 "pl0.l" { TOKEN(",", T_COMMA, "comma"); } YY_BREAK case 46: YY_RULE_SETUP #line 131 "pl0.l" { TOKEN(";", T_SEMICOLON, "semicolon"); } YY_BREAK case 47: YY_RULE_SETUP #line 132 "pl0.l" { TOKEN(".", T_DOT, "dot"); } YY_BREAK case 48: YY_RULE_SETUP #line 133 "pl0.l" { error("Unknown symbol ':': assignment requires ':='", "invalid-colon", __LINE__, "INITIAL", match_span); } YY_BREAK case 49: YY_RULE_SETUP #line 134 "pl0.l" { error("Illegal character", "invalid", __LINE__, "INITIAL", match_span); } YY_BREAK case YY_STATE_EOF(INITIAL): #line 135 "pl0.l" { Span end = {offset, offset, source_line, source_column}; event("eof", __LINE__, "eof", "INITIAL", "INITIAL", end, -1, -1); yyterminate(); } YY_BREAK case 50: YY_RULE_SETUP #line 137 "pl0.l" YY_FATAL_ERROR( "flex scanner jammed" ); YY_BREAK #line 1187 "lex.yy.c" case YY_END_OF_BUFFER: { /* Amount of text matched not including the EOB char. */ int yy_amount_of_matched_text = (int) (yy_cp - (yytext_ptr)) - 1; /* Undo the effects of YY_DO_BEFORE_ACTION. */ *yy_cp = (yy_hold_char); YY_RESTORE_YY_MORE_OFFSET if ( YY_CURRENT_BUFFER_LVALUE->yy_buffer_status == YY_BUFFER_NEW ) { /* We're scanning a new file or input source. It's * possible that this happened because the user * just pointed yyin at a new source and called * yylex(). If so, then we have to assure * consistency between YY_CURRENT_BUFFER and our * globals. Here is the right place to do so, because * this is the first action (other than possibly a * back-up) that will match for the new input source. */ (yy_n_chars) = YY_CURRENT_BUFFER_LVALUE->yy_n_chars; YY_CURRENT_BUFFER_LVALUE->yy_input_file = yyin; YY_CURRENT_BUFFER_LVALUE->yy_buffer_status = YY_BUFFER_NORMAL; } /* Note that here we test for yy_c_buf_p "<=" to the position * of the first EOB in the buffer, since yy_c_buf_p will * already have been incremented past the NUL character * (since all states make transitions on EOB to the * end-of-buffer state). Contrast this with the test * in input(). */ if ( (yy_c_buf_p) <= &YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[(yy_n_chars)] ) { /* This was really a NUL. */ yy_state_type yy_next_state; (yy_c_buf_p) = (yytext_ptr) + yy_amount_of_matched_text; yy_current_state = yy_get_previous_state( ); /* Okay, we're now positioned to make the NUL * transition. We couldn't have * yy_get_previous_state() go ahead and do it * for us because it doesn't know how to deal * with the possibility of jamming (and we don't * want to build jamming into it because then it * will run more slowly). */ yy_next_state = yy_try_NUL_trans( yy_current_state ); yy_bp = (yytext_ptr) + YY_MORE_ADJ; if ( yy_next_state ) { /* Consume the NUL. */ yy_cp = ++(yy_c_buf_p); yy_current_state = yy_next_state; goto yy_match; } else { yy_cp = (yy_last_accepting_cpos); yy_current_state = (yy_last_accepting_state); goto yy_find_action; } } else switch ( yy_get_next_buffer( ) ) { case EOB_ACT_END_OF_FILE: { (yy_did_buffer_switch_on_eof) = 0; if ( yywrap( ) ) { /* Note: because we've taken care in * yy_get_next_buffer() to have set up * yytext, we can now set up * yy_c_buf_p so that if some total * hoser (like flex itself) wants to * call the scanner after we return the * YY_NULL, it'll still work - another * YY_NULL will get returned. */ (yy_c_buf_p) = (yytext_ptr) + YY_MORE_ADJ; yy_act = YY_STATE_EOF(YY_START); goto do_action; } else { if ( ! (yy_did_buffer_switch_on_eof) ) YY_NEW_FILE; } break; } case EOB_ACT_CONTINUE_SCAN: (yy_c_buf_p) = (yytext_ptr) + yy_amount_of_matched_text; yy_current_state = yy_get_previous_state( ); yy_cp = (yy_c_buf_p); yy_bp = (yytext_ptr) + YY_MORE_ADJ; goto yy_match; case EOB_ACT_LAST_MATCH: (yy_c_buf_p) = &YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[(yy_n_chars)]; yy_current_state = yy_get_previous_state( ); yy_cp = (yy_c_buf_p); yy_bp = (yytext_ptr) + YY_MORE_ADJ; goto yy_find_action; } break; } default: YY_FATAL_ERROR( "fatal flex scanner internal error--no action found" ); } /* end of action switch */ } /* end of scanning one token */ } /* end of user's declarations */ } /* end of yylex */ /* yy_get_next_buffer - try to read in a new buffer * * Returns a code representing an action: * EOB_ACT_LAST_MATCH - * EOB_ACT_CONTINUE_SCAN - continue scanning from current position * EOB_ACT_END_OF_FILE - end of file */ static int yy_get_next_buffer (void) { char *dest = YY_CURRENT_BUFFER_LVALUE->yy_ch_buf; char *source = (yytext_ptr); int number_to_move, i; int ret_val; if ( (yy_c_buf_p) > &YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[(yy_n_chars) + 1] ) YY_FATAL_ERROR( "fatal flex scanner internal error--end of buffer missed" ); if ( YY_CURRENT_BUFFER_LVALUE->yy_fill_buffer == 0 ) { /* Don't try to fill the buffer, so this is an EOF. */ if ( (yy_c_buf_p) - (yytext_ptr) - YY_MORE_ADJ == 1 ) { /* We matched a single character, the EOB, so * treat this as a final EOF. */ return EOB_ACT_END_OF_FILE; } else { /* We matched some text prior to the EOB, first * process it. */ return EOB_ACT_LAST_MATCH; } } /* Try to read more data. */ /* First move last chars to start of buffer. */ number_to_move = (int) ((yy_c_buf_p) - (yytext_ptr) - 1); for ( i = 0; i < number_to_move; ++i ) *(dest++) = *(source++); if ( YY_CURRENT_BUFFER_LVALUE->yy_buffer_status == YY_BUFFER_EOF_PENDING ) /* don't do the read, it's not guaranteed to return an EOF, * just force an EOF */ YY_CURRENT_BUFFER_LVALUE->yy_n_chars = (yy_n_chars) = 0; else { int num_to_read = YY_CURRENT_BUFFER_LVALUE->yy_buf_size - number_to_move - 1; while ( num_to_read <= 0 ) { /* Not enough room in the buffer - grow it. */ /* just a shorter name for the current buffer */ YY_BUFFER_STATE b = YY_CURRENT_BUFFER_LVALUE; int yy_c_buf_p_offset = (int) ((yy_c_buf_p) - b->yy_ch_buf); if ( b->yy_is_our_buffer ) { int new_size = b->yy_buf_size * 2; if ( new_size <= 0 ) b->yy_buf_size += b->yy_buf_size / 8; else b->yy_buf_size *= 2; b->yy_ch_buf = (char *) /* Include room in for 2 EOB chars. */ yyrealloc( (void *) b->yy_ch_buf, (yy_size_t) (b->yy_buf_size + 2) ); } else /* Can't grow it, we don't own it. */ b->yy_ch_buf = NULL; if ( ! b->yy_ch_buf ) YY_FATAL_ERROR( "fatal error - scanner input buffer overflow" ); (yy_c_buf_p) = &b->yy_ch_buf[yy_c_buf_p_offset]; num_to_read = YY_CURRENT_BUFFER_LVALUE->yy_buf_size - number_to_move - 1; } if ( num_to_read > YY_READ_BUF_SIZE ) num_to_read = YY_READ_BUF_SIZE; /* Read in more data. */ YY_INPUT( (&YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[number_to_move]), (yy_n_chars), num_to_read ); YY_CURRENT_BUFFER_LVALUE->yy_n_chars = (yy_n_chars); } if ( (yy_n_chars) == 0 ) { if ( number_to_move == YY_MORE_ADJ ) { ret_val = EOB_ACT_END_OF_FILE; yyrestart( yyin ); } else { ret_val = EOB_ACT_LAST_MATCH; YY_CURRENT_BUFFER_LVALUE->yy_buffer_status = YY_BUFFER_EOF_PENDING; } } else ret_val = EOB_ACT_CONTINUE_SCAN; if (((yy_n_chars) + number_to_move) > YY_CURRENT_BUFFER_LVALUE->yy_buf_size) { /* Extend the array by 50%, plus the number we really need. */ int new_size = (yy_n_chars) + number_to_move + ((yy_n_chars) >> 1); YY_CURRENT_BUFFER_LVALUE->yy_ch_buf = (char *) yyrealloc( (void *) YY_CURRENT_BUFFER_LVALUE->yy_ch_buf, (yy_size_t) new_size ); if ( ! YY_CURRENT_BUFFER_LVALUE->yy_ch_buf ) YY_FATAL_ERROR( "out of dynamic memory in yy_get_next_buffer()" ); /* "- 2" to take care of EOB's */ YY_CURRENT_BUFFER_LVALUE->yy_buf_size = (int) (new_size - 2); } (yy_n_chars) += number_to_move; YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[(yy_n_chars)] = YY_END_OF_BUFFER_CHAR; YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[(yy_n_chars) + 1] = YY_END_OF_BUFFER_CHAR; (yytext_ptr) = &YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[0]; return ret_val; } /* yy_get_previous_state - get the state just before the EOB char was reached */ static yy_state_type yy_get_previous_state (void) { yy_state_type yy_current_state; char *yy_cp; yy_current_state = (yy_start); for ( yy_cp = (yytext_ptr) + YY_MORE_ADJ; yy_cp < (yy_c_buf_p); ++yy_cp ) { YY_CHAR yy_c = (*yy_cp ? yy_ec[YY_SC_TO_UI(*yy_cp)] : 1); if ( yy_accept[yy_current_state] ) { (yy_last_accepting_state) = yy_current_state; (yy_last_accepting_cpos) = yy_cp; } while ( yy_chk[yy_base[yy_current_state] + yy_c] != yy_current_state ) { yy_current_state = (int) yy_def[yy_current_state]; if ( yy_current_state >= 139 ) yy_c = yy_meta[yy_c]; } yy_current_state = yy_nxt[yy_base[yy_current_state] + yy_c]; } return yy_current_state; } /* yy_try_NUL_trans - try to make a transition on the NUL character * * synopsis * next_state = yy_try_NUL_trans( current_state ); */ static yy_state_type yy_try_NUL_trans (yy_state_type yy_current_state ) { int yy_is_jam; char *yy_cp = (yy_c_buf_p); YY_CHAR yy_c = 1; if ( yy_accept[yy_current_state] ) { (yy_last_accepting_state) = yy_current_state; (yy_last_accepting_cpos) = yy_cp; } while ( yy_chk[yy_base[yy_current_state] + yy_c] != yy_current_state ) { yy_current_state = (int) yy_def[yy_current_state]; if ( yy_current_state >= 139 ) yy_c = yy_meta[yy_c]; } yy_current_state = yy_nxt[yy_base[yy_current_state] + yy_c]; yy_is_jam = (yy_current_state == 138); return yy_is_jam ? 0 : yy_current_state; } #ifndef YY_NO_UNPUT #endif #ifndef YY_NO_INPUT #ifdef __cplusplus static int yyinput (void) #else static int input (void) #endif { int c; *(yy_c_buf_p) = (yy_hold_char); if ( *(yy_c_buf_p) == YY_END_OF_BUFFER_CHAR ) { /* yy_c_buf_p now points to the character we want to return. * If this occurs *before* the EOB characters, then it's a * valid NUL; if not, then we've hit the end of the buffer. */ if ( (yy_c_buf_p) < &YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[(yy_n_chars)] ) /* This was really a NUL. */ *(yy_c_buf_p) = '\0'; else { /* need more input */ int offset = (int) ((yy_c_buf_p) - (yytext_ptr)); ++(yy_c_buf_p); switch ( yy_get_next_buffer( ) ) { case EOB_ACT_LAST_MATCH: /* This happens because yy_g_n_b() * sees that we've accumulated a * token and flags that we need to * try matching the token before * proceeding. But for input(), * there's no matching to consider. * So convert the EOB_ACT_LAST_MATCH * to EOB_ACT_END_OF_FILE. */ /* Reset buffer status. */ yyrestart( yyin ); /*FALLTHROUGH*/ case EOB_ACT_END_OF_FILE: { if ( yywrap( ) ) return 0; if ( ! (yy_did_buffer_switch_on_eof) ) YY_NEW_FILE; #ifdef __cplusplus return yyinput(); #else return input(); #endif } case EOB_ACT_CONTINUE_SCAN: (yy_c_buf_p) = (yytext_ptr) + offset; break; } } } c = *(unsigned char *) (yy_c_buf_p); /* cast for 8-bit char's */ *(yy_c_buf_p) = '\0'; /* preserve yytext */ (yy_hold_char) = *++(yy_c_buf_p); return c; } #endif /* ifndef YY_NO_INPUT */ /** Immediately switch to a different input stream. * @param input_file A readable stream. * * @note This function does not reset the start condition to @c INITIAL . */ void yyrestart (FILE * input_file ) { if ( ! YY_CURRENT_BUFFER ){ yyensure_buffer_stack (); YY_CURRENT_BUFFER_LVALUE = yy_create_buffer( yyin, YY_BUF_SIZE ); } yy_init_buffer( YY_CURRENT_BUFFER, input_file ); yy_load_buffer_state( ); } /** Switch to a different input buffer. * @param new_buffer The new input buffer. * */ void yy_switch_to_buffer (YY_BUFFER_STATE new_buffer ) { /* TODO. We should be able to replace this entire function body * with * yypop_buffer_state(); * yypush_buffer_state(new_buffer); */ yyensure_buffer_stack (); if ( YY_CURRENT_BUFFER == new_buffer ) return; if ( YY_CURRENT_BUFFER ) { /* Flush out information for old buffer. */ *(yy_c_buf_p) = (yy_hold_char); YY_CURRENT_BUFFER_LVALUE->yy_buf_pos = (yy_c_buf_p); YY_CURRENT_BUFFER_LVALUE->yy_n_chars = (yy_n_chars); } YY_CURRENT_BUFFER_LVALUE = new_buffer; yy_load_buffer_state( ); /* We don't actually know whether we did this switch during * EOF (yywrap()) processing, but the only time this flag * is looked at is after yywrap() is called, so it's safe * to go ahead and always set it. */ (yy_did_buffer_switch_on_eof) = 1; } static void yy_load_buffer_state (void) { (yy_n_chars) = YY_CURRENT_BUFFER_LVALUE->yy_n_chars; (yytext_ptr) = (yy_c_buf_p) = YY_CURRENT_BUFFER_LVALUE->yy_buf_pos; yyin = YY_CURRENT_BUFFER_LVALUE->yy_input_file; (yy_hold_char) = *(yy_c_buf_p); } /** Allocate and initialize an input buffer state. * @param file A readable stream. * @param size The character buffer size in bytes. When in doubt, use @c YY_BUF_SIZE. * * @return the allocated buffer state. */ YY_BUFFER_STATE yy_create_buffer (FILE * file, int size ) { YY_BUFFER_STATE b; b = (YY_BUFFER_STATE) yyalloc( sizeof( struct yy_buffer_state ) ); if ( ! b ) YY_FATAL_ERROR( "out of dynamic memory in yy_create_buffer()" ); b->yy_buf_size = size; /* yy_ch_buf has to be 2 characters longer than the size given because * we need to put in 2 end-of-buffer characters. */ b->yy_ch_buf = (char *) yyalloc( (yy_size_t) (b->yy_buf_size + 2) ); if ( ! b->yy_ch_buf ) YY_FATAL_ERROR( "out of dynamic memory in yy_create_buffer()" ); b->yy_is_our_buffer = 1; yy_init_buffer( b, file ); return b; } /** Destroy the buffer. * @param b a buffer created with yy_create_buffer() * */ void yy_delete_buffer (YY_BUFFER_STATE b ) { if ( ! b ) return; if ( b == YY_CURRENT_BUFFER ) /* Not sure if we should pop here. */ YY_CURRENT_BUFFER_LVALUE = (YY_BUFFER_STATE) 0; if ( b->yy_is_our_buffer ) yyfree( (void *) b->yy_ch_buf ); yyfree( (void *) b ); } /* Initializes or reinitializes a buffer. * This function is sometimes called more than once on the same buffer, * such as during a yyrestart() or at EOF. */ static void yy_init_buffer (YY_BUFFER_STATE b, FILE * file ) { int oerrno = errno; yy_flush_buffer( b ); b->yy_input_file = file; b->yy_fill_buffer = 1; /* If b is the current buffer, then yy_init_buffer was _probably_ * called from yyrestart() or through yy_get_next_buffer. * In that case, we don't want to reset the lineno or column. */ if (b != YY_CURRENT_BUFFER){ b->yy_bs_lineno = 1; b->yy_bs_column = 0; } b->yy_is_interactive = 0; errno = oerrno; } /** Discard all buffered characters. On the next scan, YY_INPUT will be called. * @param b the buffer state to be flushed, usually @c YY_CURRENT_BUFFER. * */ void yy_flush_buffer (YY_BUFFER_STATE b ) { if ( ! b ) return; b->yy_n_chars = 0; /* We always need two end-of-buffer characters. The first causes * a transition to the end-of-buffer state. The second causes * a jam in that state. */ b->yy_ch_buf[0] = YY_END_OF_BUFFER_CHAR; b->yy_ch_buf[1] = YY_END_OF_BUFFER_CHAR; b->yy_buf_pos = &b->yy_ch_buf[0]; b->yy_at_bol = 1; b->yy_buffer_status = YY_BUFFER_NEW; if ( b == YY_CURRENT_BUFFER ) yy_load_buffer_state( ); } /** Pushes the new state onto the stack. The new state becomes * the current state. This function will allocate the stack * if necessary. * @param new_buffer The new state. * */ void yypush_buffer_state (YY_BUFFER_STATE new_buffer ) { if (new_buffer == NULL) return; yyensure_buffer_stack(); /* This block is copied from yy_switch_to_buffer. */ if ( YY_CURRENT_BUFFER ) { /* Flush out information for old buffer. */ *(yy_c_buf_p) = (yy_hold_char); YY_CURRENT_BUFFER_LVALUE->yy_buf_pos = (yy_c_buf_p); YY_CURRENT_BUFFER_LVALUE->yy_n_chars = (yy_n_chars); } /* Only push if top exists. Otherwise, replace top. */ if (YY_CURRENT_BUFFER) (yy_buffer_stack_top)++; YY_CURRENT_BUFFER_LVALUE = new_buffer; /* copied from yy_switch_to_buffer. */ yy_load_buffer_state( ); (yy_did_buffer_switch_on_eof) = 1; } /** Removes and deletes the top of the stack, if present. * The next element becomes the new top. * */ void yypop_buffer_state (void) { if (!YY_CURRENT_BUFFER) return; yy_delete_buffer(YY_CURRENT_BUFFER ); YY_CURRENT_BUFFER_LVALUE = NULL; if ((yy_buffer_stack_top) > 0) --(yy_buffer_stack_top); if (YY_CURRENT_BUFFER) { yy_load_buffer_state( ); (yy_did_buffer_switch_on_eof) = 1; } } /* Allocates the stack if it does not exist. * Guarantees space for at least one push. */ static void yyensure_buffer_stack (void) { yy_size_t num_to_alloc; if (!(yy_buffer_stack)) { /* First allocation is just for 2 elements, since we don't know if this * scanner will even need a stack. We use 2 instead of 1 to avoid an * immediate realloc on the next call. */ num_to_alloc = 1; /* After all that talk, this was set to 1 anyways... */ (yy_buffer_stack) = (struct yy_buffer_state**)yyalloc (num_to_alloc * sizeof(struct yy_buffer_state*) ); if ( ! (yy_buffer_stack) ) YY_FATAL_ERROR( "out of dynamic memory in yyensure_buffer_stack()" ); memset((yy_buffer_stack), 0, num_to_alloc * sizeof(struct yy_buffer_state*)); (yy_buffer_stack_max) = num_to_alloc; (yy_buffer_stack_top) = 0; return; } if ((yy_buffer_stack_top) >= ((yy_buffer_stack_max)) - 1){ /* Increase the buffer to prepare for a possible push. */ yy_size_t grow_size = 8 /* arbitrary grow size */; num_to_alloc = (yy_buffer_stack_max) + grow_size; (yy_buffer_stack) = (struct yy_buffer_state**)yyrealloc ((yy_buffer_stack), num_to_alloc * sizeof(struct yy_buffer_state*) ); if ( ! (yy_buffer_stack) ) YY_FATAL_ERROR( "out of dynamic memory in yyensure_buffer_stack()" ); /* zero only the new slots.*/ memset((yy_buffer_stack) + (yy_buffer_stack_max), 0, grow_size * sizeof(struct yy_buffer_state*)); (yy_buffer_stack_max) = num_to_alloc; } } /** Setup the input buffer state to scan directly from a user-specified character buffer. * @param base the character buffer * @param size the size in bytes of the character buffer * * @return the newly allocated buffer state object. */ YY_BUFFER_STATE yy_scan_buffer (char * base, yy_size_t size ) { YY_BUFFER_STATE b; if ( size < 2 || base[size-2] != YY_END_OF_BUFFER_CHAR || base[size-1] != YY_END_OF_BUFFER_CHAR ) /* They forgot to leave room for the EOB's. */ return NULL; b = (YY_BUFFER_STATE) yyalloc( sizeof( struct yy_buffer_state ) ); if ( ! b ) YY_FATAL_ERROR( "out of dynamic memory in yy_scan_buffer()" ); b->yy_buf_size = (int) (size - 2); /* "- 2" to take care of EOB's */ b->yy_buf_pos = b->yy_ch_buf = base; b->yy_is_our_buffer = 0; b->yy_input_file = NULL; b->yy_n_chars = b->yy_buf_size; b->yy_is_interactive = 0; b->yy_at_bol = 1; b->yy_fill_buffer = 0; b->yy_buffer_status = YY_BUFFER_NEW; yy_switch_to_buffer( b ); return b; } /** Setup the input buffer state to scan a string. The next call to yylex() will * scan from a @e copy of @a str. * @param yystr a NUL-terminated string to scan * * @return the newly allocated buffer state object. * @note If you want to scan bytes that may contain NUL values, then use * yy_scan_bytes() instead. */ YY_BUFFER_STATE yy_scan_string (const char * yystr ) { return yy_scan_bytes( yystr, (int) strlen(yystr) ); } /** Setup the input buffer state to scan the given bytes. The next call to yylex() will * scan from a @e copy of @a bytes. * @param yybytes the byte buffer to scan * @param _yybytes_len the number of bytes in the buffer pointed to by @a bytes. * * @return the newly allocated buffer state object. */ YY_BUFFER_STATE yy_scan_bytes (const char * yybytes, int _yybytes_len ) { YY_BUFFER_STATE b; char *buf; yy_size_t n; int i; /* Get memory for full buffer, including space for trailing EOB's. */ n = (yy_size_t) (_yybytes_len + 2); buf = (char *) yyalloc( n ); if ( ! buf ) YY_FATAL_ERROR( "out of dynamic memory in yy_scan_bytes()" ); for ( i = 0; i < _yybytes_len; ++i ) buf[i] = yybytes[i]; buf[_yybytes_len] = buf[_yybytes_len+1] = YY_END_OF_BUFFER_CHAR; b = yy_scan_buffer( buf, n ); if ( ! b ) YY_FATAL_ERROR( "bad buffer in yy_scan_bytes()" ); /* It's okay to grow etc. this buffer, and we should throw it * away when we're done. */ b->yy_is_our_buffer = 1; return b; } #ifndef YY_EXIT_FAILURE #define YY_EXIT_FAILURE 2 #endif static void yynoreturn yy_fatal_error (const char* msg ) { fprintf( stderr, "%s\n", msg ); exit( YY_EXIT_FAILURE ); } /* Redefine yyless() so it works in section 3 code. */ #undef yyless #define yyless(n) \ do \ { \ /* Undo effects of setting up yytext. */ \ int yyless_macro_arg = (n); \ YY_LESS_LINENO(yyless_macro_arg);\ yytext[yyleng] = (yy_hold_char); \ (yy_c_buf_p) = yytext + yyless_macro_arg; \ (yy_hold_char) = *(yy_c_buf_p); \ *(yy_c_buf_p) = '\0'; \ yyleng = yyless_macro_arg; \ } \ while ( 0 ) /* Accessor methods (get/set functions) to struct members. */ /** Get the current line number. * */ int yyget_lineno (void) { return yylineno; } /** Get the input stream. * */ FILE *yyget_in (void) { return yyin; } /** Get the output stream. * */ FILE *yyget_out (void) { return yyout; } /** Get the length of the current token. * */ int yyget_leng (void) { return yyleng; } /** Get the current token. * */ char *yyget_text (void) { return yytext; } /** Set the current line number. * @param _line_number line number * */ void yyset_lineno (int _line_number ) { yylineno = _line_number; } /** Set the input stream. This does not discard the current * input buffer. * @param _in_str A readable stream. * * @see yy_switch_to_buffer */ void yyset_in (FILE * _in_str ) { yyin = _in_str ; } void yyset_out (FILE * _out_str ) { yyout = _out_str ; } int yyget_debug (void) { return yy_flex_debug; } void yyset_debug (int _bdebug ) { yy_flex_debug = _bdebug ; } static int yy_init_globals (void) { /* Initialization is the same as for the non-reentrant scanner. * This function is called from yylex_destroy(), so don't allocate here. */ (yy_buffer_stack) = NULL; (yy_buffer_stack_top) = 0; (yy_buffer_stack_max) = 0; (yy_c_buf_p) = NULL; (yy_init) = 0; (yy_start) = 0; /* Defined in main.c */ #ifdef YY_STDINIT yyin = stdin; yyout = stdout; #else yyin = NULL; yyout = NULL; #endif /* For future reference: Set errno on error, since we are called by * yylex_init() */ return 0; } /* yylex_destroy is for both reentrant and non-reentrant scanners. */ int yylex_destroy (void) { /* Pop the buffer stack, destroying each element. */ while(YY_CURRENT_BUFFER){ yy_delete_buffer( YY_CURRENT_BUFFER ); YY_CURRENT_BUFFER_LVALUE = NULL; yypop_buffer_state(); } /* Destroy the stack itself. */ yyfree((yy_buffer_stack) ); (yy_buffer_stack) = NULL; /* Reset the globals. This is important in a non-reentrant scanner so the next time * yylex() is called, initialization will occur. */ yy_init_globals( ); return 0; } /* * Internal utility routines. */ #ifndef yytext_ptr static void yy_flex_strncpy (char* s1, const char * s2, int n ) { int i; for ( i = 0; i < n; ++i ) s1[i] = s2[i]; } #endif #ifdef YY_NEED_STRLEN static int yy_flex_strlen (const char * s ) { int n; for ( n = 0; s[n]; ++n ) ; return n; } #endif void *yyalloc (yy_size_t size ) { return malloc(size); } void *yyrealloc (void * ptr, yy_size_t size ) { /* The cast to (char *) in the following accommodates both * implementations that use char* generic pointers, and those * that use void* generic pointers. It works with the latter * because both ANSI C and C++ allow castless assignment from * any pointer type to void*, and deal with argument conversions * as though doing an assignment. */ return realloc(ptr, size); } void yyfree (void * ptr ) { free( (char *) ptr ); /* see yyrealloc() for (char *) cast */ } #define YYTABLES_NAME "yytables" #line 137 "pl0.l" static void fatal(const char *message) { fprintf(stderr, "pl0lex: %s\n", message); exit(2); } static void *grow(void *data, size_t *capacity, size_t count, size_t item_size) { if (count < *capacity) return data; size_t next = *capacity ? *capacity * 2 : 64; if (next < *capacity || next > (size_t)-1 / item_size) fatal("Input is too large"); void *result = realloc(data, next * item_size); if (!result) fatal("Out of memory"); *capacity = next; return result; } static void locate_match(const char *text, size_t length) { match_span = (Span){offset, offset + length, source_line, source_column}; for (size_t i = 0; i < length; ++i) { unsigned char ch = (unsigned char)text[i]; if (ch == '\r') { ++source_line; source_column = 1; } else if (ch == '\n') { if (!previous_cr) ++source_line; source_column = 1; } else if ((ch & 0xc0) != 0x80) { ++source_column; } previous_cr = ch == '\r'; } offset += length; } static const char *state_name(int state) { switch (state) { case BLOCK_COMMENT: return "BLOCK_COMMENT"; case BRACE_COMMENT: return "BRACE_COMMENT"; case PAREN_COMMENT: return "PAREN_COMMENT"; default: return "INITIAL"; } } static void event(const char *rule, int rule_line, const char *kind, const char *before, const char *after, Span span, long token_index, long error_index) { events = grow(events, &event_capacity, event_count, sizeof(*events)); events[event_count++] = (Event){rule, kind, before, after, rule_line, span, token_index, error_index}; } static void token(const char *type, int code, const char *rule, int rule_line) { tokens = grow(tokens, &token_capacity, token_count, sizeof(*tokens)); tokens[token_count] = (Token){type, code, match_span}; event(rule, rule_line, "token", "INITIAL", "INITIAL", match_span, (long)token_count, -1); ++token_count; } static void error(const char *message, const char *rule, int rule_line, const char *state, Span span) { errors = grow(errors, &error_capacity, error_count, sizeof(*errors)); errors[error_count] = (Diagnostic){message, span}; event(rule, rule_line, "error", state, state, span, -1, (long)error_count); ++error_count; } static void finish_comment(const char *message, const char *state, int rule_line) { error(message, "unterminated-comment", rule_line, state, comment_open); Span end = {offset, offset, source_line, source_column}; event("eof", rule_line, "eof", state, "INITIAL", end, -1, -1); } static void quoted(const char *text, size_t length) { putchar('"'); for (size_t i = 0; i < length; ++i) { unsigned char ch = (unsigned char)text[i]; switch (ch) { case '"': fputs("\\\"", stdout); break; case '\\': fputs("\\\\", stdout); break; case '\n': fputs("\\n", stdout); break; case '\r': fputs("\\r", stdout); break; case '\t': fputs("\\t", stdout); break; default: if (ch < 0x20) printf("\\u%04x", ch); else putchar(ch); } } putchar('"'); } static void string(const char *text) { quoted(text, strlen(text)); } static void span_json(Span span) { fputs("\"lexeme\":", stdout); quoted(source + span.start, span.end - span.start); printf(",\"line\":%d,\"column\":%d,\"start\":%zu,\"end\":%zu", span.line, span.column, span.start, span.end); } static void print_json(void) { fputs("{\"offsetEncoding\":\"utf8-bytes\",\"source\":", stdout); quoted(source, source_length); fputs(",\"tokens\":[", stdout); for (size_t i = 0; i < token_count; ++i) { if (i) putchar(','); fputs("{\"type\":", stdout); string(tokens[i].type); printf(",\"code\":%d,", tokens[i].code); span_json(tokens[i].span); putchar('}'); } fputs("],\"errors\":[", stdout); for (size_t i = 0; i < error_count; ++i) { if (i) putchar(','); fputs("{\"message\":", stdout); string(errors[i].message); putchar(','); span_json(errors[i].span); putchar('}'); } fputs("],\"trace\":[", stdout); for (size_t i = 0; i < event_count; ++i) { Event *step = &events[i]; if (i) putchar(','); fputs("{\"rule\":", stdout); string(step->rule); printf(",\"ruleLine\":%d,\"kind\":", step->rule_line); string(step->kind); fputs(",\"stateBefore\":", stdout); string(step->before); fputs(",\"stateAfter\":", stdout); string(step->after); putchar(','); span_json(step->span); if (step->token >= 0) printf(",\"token\":%ld", step->token); if (step->error >= 0) printf(",\"error\":%ld", step->error); putchar('}'); } printf("],\"summary\":{\"tokens\":%zu,\"errors\":%zu}}\n", token_count, error_count); } static void print_terminal(const char *filename) { printf("PL/0 lexical analysis (Flex)\nInput: %s\n\n", filename); fputs("SOURCE\n------\n", stdout); fwrite(source, 1, source_length, stdout); if (!source_length || source[source_length - 1] != '\n') putchar('\n'); fputs("\nTOKENS\n------\n No. Line:Col Code Type Lexeme\n", stdout); for (size_t i = 0; i < token_count; ++i) { Token *item = &tokens[i]; printf("%5zu %4d:%-3d %4d %-12s ", i + 1, item->span.line, item->span.column, item->code, item->type); quoted(source + item->span.start, item->span.end - item->span.start); putchar('\n'); } fputs("\nDIAGNOSTICS\n-----------\n", stdout); if (!error_count) fputs("None.\n", stdout); for (size_t i = 0; i < error_count; ++i) { Diagnostic *item = &errors[i]; printf("%d:%d %s ", item->span.line, item->span.column, item->message); quoted(source + item->span.start, item->span.end - item->span.start); putchar('\n'); } printf("\nSummary: %zu tokens, %zu errors.\n", token_count, error_count); } static void read_source(FILE *file) { size_t capacity = 8192; source = malloc(capacity); if (!source) fatal("Out of memory"); for (;;) { size_t count = fread(source + source_length, 1, capacity - source_length, file); source_length += count; if (ferror(file)) fatal("Cannot read input"); if (feof(file)) break; if (source_length >= (size_t)INT_MAX) fatal("Input exceeds the Flex buffer limit"); if (source_length == capacity) { size_t next = capacity * 2; char *buffer = realloc(source, next); if (!buffer) fatal("Out of memory"); source = buffer; capacity = next; } } if (source_length > (size_t)INT_MAX) fatal("Input exceeds the Flex buffer limit"); } static void validate_utf8(void) { for (size_t i = 0; i < source_length;) { unsigned char first = (unsigned char)source[i++]; if (first < 0x80) continue; size_t continuation; unsigned char low = 0x80, high = 0xbf; if (first >= 0xc2 && first <= 0xdf) continuation = 1; else if (first >= 0xe0 && first <= 0xef) { continuation = 2; if (first == 0xe0) low = 0xa0; if (first == 0xed) high = 0x9f; } else if (first >= 0xf0 && first <= 0xf4) { continuation = 3; if (first == 0xf0) low = 0x90; if (first == 0xf4) high = 0x8f; } else fatal("Input is not valid UTF-8"); if (source_length - i < continuation) fatal("Input is not valid UTF-8"); unsigned char next = (unsigned char)source[i]; if (next < low || next > high) fatal("Input is not valid UTF-8"); for (size_t j = 0; j < continuation; ++j) { next = (unsigned char)source[i++]; if (next < 0x80 || next > 0xbf) fatal("Input is not valid UTF-8"); } } } int main(int argc, char **argv) { int json = 0; const char *filename = NULL; for (int i = 1; i < argc; ++i) { if (strcmp(argv[i], "--json") == 0) json = 1; else if (strcmp(argv[i], "--help") == 0 || strcmp(argv[i], "-h") == 0) { puts("Usage: pl0lex [--json] [file|-]\nRead a UTF-8 PL/0 file, or standard input.\nExit: 0 success, 1 lexical errors, 2 usage or I/O failure."); return 0; } else if (!filename && (argv[i][0] != '-' || strcmp(argv[i], "-") == 0)) filename = argv[i]; else fatal("Usage: pl0lex [--json] [file|-]"); } FILE *file = stdin; #ifdef _WIN32 if (_setmode(_fileno(stdin), _O_BINARY) == -1) fatal("Cannot set binary input mode"); #endif if (filename && strcmp(filename, "-") != 0) { file = fopen(filename, "rb"); if (!file) fatal("Cannot open input file"); } read_source(file); if (file != stdin) fclose(file); validate_utf8(); if (source_length >= 3 && memcmp(source, "\xef\xbb\xbf", 3) == 0) { locate_match(source, 3); source_column = 1; event("bom", __LINE__, "skip", "INITIAL", "INITIAL", match_span, -1, -1); } YY_BUFFER_STATE buffer = yy_scan_bytes(source + offset, (int)(source_length - offset)); if (!buffer) fatal("Cannot allocate scanner buffer"); yylex(); if (json) print_json(); else print_terminal(filename ? filename : ""); if (fflush(stdout) == EOF || ferror(stdout)) fatal("Cannot write output"); int status = error_count ? 1 : 0; yy_delete_buffer(buffer); yylex_destroy(); free(source); free(tokens); free(errors); free(events); return status; }