Fix transition table. Need to fix string literal read
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0b5fb5befa
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1
buffer.h
1
buffer.h
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@ -91,6 +91,5 @@ char b_rflag(Buffer* const);
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short b_retract(Buffer* const);
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short b_retract_to_mark(Buffer* const);
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short b_getcoffset(Buffer* const);
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char* b_cbhead(Buffer* const);
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#endif
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@ -9,12 +9,18 @@ Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "scanner", "scanner\scanner.
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EndProject
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Global
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GlobalSection(SolutionConfigurationPlatforms) = preSolution
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COMPILERS|x64 = COMPILERS|x64
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COMPILERS|x86 = COMPILERS|x86
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Debug|x64 = Debug|x64
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Debug|x86 = Debug|x86
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Release|x64 = Release|x64
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Release|x86 = Release|x86
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EndGlobalSection
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GlobalSection(ProjectConfigurationPlatforms) = postSolution
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{034E0E4B-DAFA-45D4-882B-1815AC73DA9E}.COMPILERS|x64.ActiveCfg = COMPILERS|x64
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{034E0E4B-DAFA-45D4-882B-1815AC73DA9E}.COMPILERS|x64.Build.0 = COMPILERS|x64
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{034E0E4B-DAFA-45D4-882B-1815AC73DA9E}.COMPILERS|x86.ActiveCfg = COMPILERS|Win32
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{034E0E4B-DAFA-45D4-882B-1815AC73DA9E}.COMPILERS|x86.Build.0 = COMPILERS|Win32
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{034E0E4B-DAFA-45D4-882B-1815AC73DA9E}.Debug|x64.ActiveCfg = Debug|x64
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{034E0E4B-DAFA-45D4-882B-1815AC73DA9E}.Debug|x64.Build.0 = Debug|x64
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{034E0E4B-DAFA-45D4-882B-1815AC73DA9E}.Debug|x86.ActiveCfg = Debug|Win32
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@ -23,6 +29,10 @@ Global
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{034E0E4B-DAFA-45D4-882B-1815AC73DA9E}.Release|x64.Build.0 = Release|x64
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{034E0E4B-DAFA-45D4-882B-1815AC73DA9E}.Release|x86.ActiveCfg = Release|Win32
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{034E0E4B-DAFA-45D4-882B-1815AC73DA9E}.Release|x86.Build.0 = Release|Win32
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{C53261F2-8A2D-4F75-8E54-DBFD16A621BB}.COMPILERS|x64.ActiveCfg = COMPILERS|x64
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{C53261F2-8A2D-4F75-8E54-DBFD16A621BB}.COMPILERS|x64.Build.0 = COMPILERS|x64
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{C53261F2-8A2D-4F75-8E54-DBFD16A621BB}.COMPILERS|x86.ActiveCfg = COMPILERS|Win32
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{C53261F2-8A2D-4F75-8E54-DBFD16A621BB}.COMPILERS|x86.Build.0 = COMPILERS|Win32
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{C53261F2-8A2D-4F75-8E54-DBFD16A621BB}.Debug|x64.ActiveCfg = Debug|x64
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{C53261F2-8A2D-4F75-8E54-DBFD16A621BB}.Debug|x64.Build.0 = Debug|x64
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{C53261F2-8A2D-4F75-8E54-DBFD16A621BB}.Debug|x86.ActiveCfg = Debug|Win32
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640
scanner.c
640
scanner.c
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@ -10,11 +10,11 @@
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* Date: 30 January 2017
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*/
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/* The #define _CRT_SECURE_NO_WARNINGS should be used in MS Visual Studio projects
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* to suppress the warnings about using "unsafe" functions like fopen()
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* and standard sting library functions defined in string.h.
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* The define does not have any effect in Borland compiler projects.
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*/
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/* The #define _CRT_SECURE_NO_WARNINGS should be used in MS Visual Studio projects
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* to suppress the warnings about using "unsafe" functions like fopen()
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* and standard sting library functions defined in string.h.
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* The define does not have any effect in Borland compiler projects.
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*/
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#define _CRT_SECURE_NO_WARNINGS
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#include <stdio.h> /* standard input / output */
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@ -24,7 +24,7 @@
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#include <limits.h> /* integer types constants */
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#include <float.h> /* floating-point types constants */
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/*#define NDEBUG to suppress assert() call */
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/*#define NDEBUG to suppress assert() call */
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#include <assert.h> /* assert() prototype */
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/* project header files */
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@ -33,7 +33,7 @@
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#include "table.h"
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#define DEBUG /* for conditional processing */
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#undef DEBUG
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/*#undef DEBUG*/
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@ -49,14 +49,14 @@ static Buffer *lex_buf;/*pointer to temporary lexeme buffer*/
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/* No other global variable declarations/definitiond are allowed */
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/* scanner.c static(local) function prototypes */
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/* scanner.c static(local) function prototypes */
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static int char_class(char c); /* character class function */
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static int get_next_state(int, char, int *); /* state machine function */
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static int iskeyword(char * kw_lexeme); /*keywords lookup functuion */
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static long atool(char * lexeme); /* converts octal string to decimal value */
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int scanner_init(Buffer * sc_buf) {
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if(b_isempty(sc_buf)) return EXIT_FAILURE;/*1*/
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if (b_isempty(sc_buf)) return EXIT_FAILURE;/*1*/
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/* in case the buffer has been read previously */
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b_setmark(sc_buf, 0);
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b_retract_to_mark(sc_buf);
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@ -68,272 +68,301 @@ int scanner_init(Buffer * sc_buf) {
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Token malar_next_token(Buffer * sc_buf)
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{
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Token t; /* token to return after recognition */
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unsigned char c; /* input symbol */
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int state = 0; /* initial state of the FSM */
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short lexstart; /*start offset of a lexeme in the input buffer */
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short lexend; /*end offset of a lexeme in the input buffer */
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int accept = NOAS; /* type of state - initially not accepting */
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/*
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lexstart is the offset from the beginning of the char buffer of the
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input buffer (sc_buf) to the first character of the current lexeme,
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which is being processed by the scanner.
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lexend is the offset from the beginning of the char buffer of the
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input buffer (sc_buf) to the last character of the current lexeme,
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which is being processed by the scanner.
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Token t; /* token to return after recognition */
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unsigned char c; /* input symbol */
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int state = 0; /* initial state of the FSM */
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short lexstart; /*start offset of a lexeme in the input buffer */
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short lexend; /*end offset of a lexeme in the input buffer */
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int accept = NOAS; /* type of state - initially not accepting */
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/*
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lexstart is the offset from the beginning of the char buffer of the
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input buffer (sc_buf) to the first character of the current lexeme,
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which is being processed by the scanner.
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lexend is the offset from the beginning of the char buffer of the
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input buffer (sc_buf) to the last character of the current lexeme,
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which is being processed by the scanner.
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*/
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//DECLARE YOUR VARIABLES HERE IF NEEDED
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int i; /* Counter for loop in string error case */
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static int str_offset = 0;
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if (sc_buf == NULL) {
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return aa_func12("RUN TIME ERROR"); /* WHOOPS */
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}
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while (1){ /* endless loop broken by token returns it will generate a warning */
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//GET THE NEXT SYMBOL FROM THE INPUT BUFFER
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*/
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//DECLARE YOUR VARIABLES HERE IF NEEDED
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int i; /* Counter for loop in string error case */
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static int str_offset = 0;
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if (sc_buf == NULL) {
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scerrnum = 1;
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return aa_table[ES]("RUN TIME ERROR"); /* WHOOPS */
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}
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while (1) { /* endless loop broken by token returns it will generate a warning */
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/* GET THE NEXT SYMBOL FROM THE INPUT BUFFER */
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c = b_getc(sc_buf);
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switch (c) {
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case 255: t.code = SEOF_T; return t; /* EOF */
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case '\0': t.code = SEOF_T; return t; /* Source EOF */
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case '\n': line++; continue; /* Ignore new line, increment line count */
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case '\r': line++; continue; /* CR, increment line count*/
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case ' ': continue; /* Ignore white space */
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case '\t': continue; /* Ignore tabs */
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case ';': t.code = EOS_T; return t; /* End of statement */
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case ',': t.code = COM_T; return t; /* Comma */
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case '{': t.code = LBR_T; return t; /* Left brace */
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case '}': t.code = RBR_T; return t; /* Right brace */
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case '(': t.code = LPR_T; return t; /* Left parenthesis */
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case ')': t.code = RPR_T; return t; /* Right parenthesis */
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case '+': t.code = ART_OP_T; t.attribute.arr_op = PLUS; return t; /* Addition operator */
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case '-': t.code = ART_OP_T; t.attribute.arr_op = MINUS; return t; /* Substraction operator */
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case '*': t.code = ART_OP_T; t.attribute.arr_op = MULT; return t; /* Multiplication operator */
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case '/': t.code = ART_OP_T; t.attribute.arr_op = DIV; return t; /* Devision operator */
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case '>': t.code = REL_OP_T; t.attribute.rel_op = GT; return t; /* Greater-than relational operator */
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case '<':
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c = b_getc(sc_buf);
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switch (c) {
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case 255: t.code = SEOF_T; return t; /* EOF */
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case '\0': t.code = SEOF_T; return t; /* Source EOF */
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case '\n': line++; continue; /* Ignore new line, increment line count */
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case '\r': line++; continue; /* CR, increment line count*/
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case ' ': continue; /* Ignore white space */
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case ';': t.code = EOS_T; return t; /* End of statement */
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case ',': t.code = COM_T; return t; /* Comma */
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case '{': t.code = RBR_T; return t; /* Right brace */
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case '}': t.code = LBR_T; return t; /* Left brace */
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case '(': t.code = RPR_T; return t; /* Right parenthesis */
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case ')': t.code = LPR_T; return t; /* Left parenthesis */
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case '+': t.code = ART_OP_T; t.attribute.arr_op = PLUS; return t; /* Addition operator */
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case '-': t.code = ART_OP_T; t.attribute.arr_op = MINUS; return t; /* Substraction operator */
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case '*': t.code = ART_OP_T; t.attribute.arr_op = MULT; return t; /* Multiplication operator */
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case '/': t.code = ART_OP_T; t.attribute.arr_op = DIV; return t; /* Devision operator */
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case '>': t.code = REL_OP_T; t.attribute.rel_op = GT; return t; /* Greater-than relational operator */
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case '<':
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/* MSVC will complain about this assignment inside a conditional expression*/
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if (c = b_getc(sc_buf) == '>') {
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t.code = REL_OP_T;
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t.attribute.rel_op = NE; /* Negation operator */
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return t;
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}
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else if (c == '<') {
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t.code = SCC_OP_T; /* String concatenation operator */
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}
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else {
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t.code = REL_OP_T;
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t.attribute.rel_op = LT; /* Less-than operator */
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}
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if (c == '>') {
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t.code = REL_OP_T;
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t.attribute.rel_op = NE; /* Negation operator */
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return t;
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}
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else if (c == '<') {
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t.code = SCC_OP_T; /* String concatenation operator */
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}
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else {
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t.code = REL_OP_T;
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t.attribute.rel_op = LT; /* Less-than operator */
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}
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b_retract(sc_buf);
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/*c = b_getc(sc_buf);*/
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return t;
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case '.':
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b_setmark(sc_buf, b_getcoffset(sc_buf)); /* Set mark before continuing (AND|OR case) */
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c = b_getc(sc_buf);
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if (c == 'A' && b_getc(sc_buf) == 'N' && b_getc(sc_buf) == 'D' && b_getc(sc_buf) == '.') {
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t.code = LOG_OP_T;
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t.attribute.log_op = AND;
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return t;
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}
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else if (c == 'O' && b_getc(sc_buf) == 'R' && b_getc(sc_buf) == '.') {
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t.code = LOG_OP_T;
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t.attribute.log_op = OR;
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return t;
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}
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t.code = ERR_T; /* "That character's not supposed to be here" case */
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t.attribute.err_lex[0] = '.';
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t.attribute.err_lex[1] = '\0';
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b_retract_to_mark(sc_buf);
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return t;
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case '!':
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c = b_getc(sc_buf);
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if (c == '<') { /* It's a comment line */
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for (; c != '\0' && c != '\r' && c != '\n' && c != 255; c = b_getc(sc_buf)); /* Consume chars until line ends */
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line++;
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continue;
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}
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else { /* Bad character, pump out an error token */
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b_retract(sc_buf);
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b_retract(sc_buf);
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t = aa_table[ES](" ");
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t.attribute.err_lex[0] = c = b_getc(sc_buf);
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t.attribute.err_lex[1] = c = b_getc(sc_buf);
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b_retract(sc_buf);
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c = b_getc(sc_buf);
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return t;
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case '.':
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b_setmark(sc_buf, b_getcoffset(sc_buf)); /* Set mark before continuing (AND|OR case) */
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if (c == 'A' && b_getc(sc_buf) == 'N' && b_getc(sc_buf) == 'D' && b_getc(sc_buf) == '.') {
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t.code = LOG_OP_T;
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t.attribute.log_op = AND;
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return t;
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}
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else if (c == 'O' && b_getc(sc_buf) == 'R' && b_getc(sc_buf) == '.') {
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t.code = LOG_OP_T;
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t.attribute.log_op = OR;
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}
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t.code = ERR_T; /* "That character's not supposed to be here" case */
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t.attribute.err_lex[0] = '.';
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t.attribute.err_lex[1] = '\0';
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b_retract_to_mark(sc_buf);
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}
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case '=':
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c = b_getc(sc_buf);
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if (c == '=') { /* Relational equals-to operator */
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t.code = REL_OP_T;
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t.attribute.rel_op = EQ;
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return t;
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case '!':
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c = b_getc(sc_buf);
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if (c == '<') { /* It's a comment line */
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for (; c != '\0' && c != '\r' && c != '\n' && c != 255; c = b_getc(sc_buf)); /* Consume chars until line ends */
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}
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b_retract(sc_buf);
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t.code = ASS_OP_T; /* Assignment operator */
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return t;
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case '\"': /* Don't quote me on this */
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c = b_getc(sc_buf);
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t.code = STR_T; /* String literal */
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b_setmark(sc_buf, b_getcoffset(sc_buf));
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lexstart = (short)str_offset;
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lexend = lexstart;
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for (; c != '\"'; c = b_getc(sc_buf)) {
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b_addc(str_LTBL, c);
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if (b_isfull(str_LTBL)) {
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t = aa_table[ES]("\"There is always ..."); /* String too big :( */
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}
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if (c == '\n' || c == '\r') {
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line++;
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continue;
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}
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else { /* Bad character, pump out an error token */
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t = aa_table[ES](" ");
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t.attribute.err_lex[0] = c;
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if (c == 255 || c == '\0') {
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b_retract_to_mark(sc_buf);
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t.code = ERR_T; /* Illegal string, make it an error token */
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for (i = 0; i < ERR_LEN; i++) {
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t.attribute.err_lex[i] = b_getc(sc_buf);
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}
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t.attribute.err_lex[i] = '\0';
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return t;
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}
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case '=':
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c = b_getc(sc_buf);
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if (c == '=') { /* Relational equals-to operator */
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t.code = REL_OP_T;
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t.attribute.rel_op = EQ;
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}
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b_retract(sc_buf);
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t.code = ASS_OP_T; /* Assignment operator */
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return t;
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case '\"': /* Don't quote me on this */
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c = b_getc(sc_buf);
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b_setmark(sc_buf, b_getcoffset(sc_buf));
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lexstart = (short)str_offset;
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lexend = lexstart;
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for (; c != '\"'; c = b_getc(sc_buf)) {
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b_addc(str_LTBL, c);
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if (b_isfull(str_LTBL)) {
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return aa_table[ES]("\"Imagine all the .."); /* String too big :( */
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}
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if (c == '\n' || c == '\r') {
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line++;
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}
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if (c == 255 || c == '\0') {
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b_retract_to_mark(sc_buf);
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for (i = 0; i < ERR_LEN; i++) {
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t.attribute.err_lex[i] = b_getc(sc_buf);
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}
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}
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lexend++;
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str_offset++;
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} /*end for loop, string finished*/
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lexend++;
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str_offset++;
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b_addc(str_LTBL, '\0');
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t.code = STR_T;
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t.attribute.str_offset = lexstart;
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return t; /* String literal */
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default:
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if (isalnum(c) || isalpha(c)) {
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lexend = 0;
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state = 0;
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lex_buf = b_create(1, 1, 'a');
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} /*end for loop, string finished*/
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while (accept == NOAS) {
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b_addc(lex_buf, c);
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state = get_next_state(state, c, &accept);
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b_addc(str_LTBL, '\0');
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t.attribute.str_offset = lexstart;
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return t;
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default:
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if (isalpha(c) || isalnum(c)) {
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if (accept != NOAS)
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break;
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c = b_getc(sc_buf);
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lexend++;
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}
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/* Entering Accepting State */
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b_addc(lex_buf, '\0');
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/*Set mark to beginning of lexeme*/
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b_setmark(sc_buf, b_getcoffset(sc_buf) - 1);
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lexstart = 0;
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lexend = 0;
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state = 0;
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if (as_table[state] == ASWR)
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b_retract(sc_buf);
|
||||
if ((t.attribute.kwt_idx = iskeyword(b_setmark(lex_buf, 0))) != -1) {
|
||||
t.code = KW_T;
|
||||
b_free(lex_buf);
|
||||
return t;
|
||||
}
|
||||
while (accept == NOAS) {
|
||||
state = get_next_state(state, c, &accept);
|
||||
|
||||
if (aa_table[state] != NULL) {
|
||||
t = aa_table[state](b_setmark(lex_buf, 0));
|
||||
}
|
||||
else {
|
||||
t = aa_table[ES]("RUN TIME ERROR");
|
||||
}
|
||||
if (accept != NOAS) { break; }
|
||||
|
||||
c = b_getc(sc_buf);
|
||||
}
|
||||
|
||||
/*
|
||||
* Entering Accepting State
|
||||
*/
|
||||
|
||||
if (as_table[state] == ASWR)
|
||||
b_retract(sc_buf);
|
||||
|
||||
/* Get start/end of lexeme */
|
||||
lexstart = b_mark(sc_buf);
|
||||
lexend = b_getcoffset(sc_buf);
|
||||
lex_buf = b_create(1, 1, 'a');
|
||||
|
||||
b_retract_to_mark(sc_buf);
|
||||
for (; lexstart < lexend; lexstart++) {
|
||||
b_addc(lex_buf, b_getc(sc_buf));
|
||||
}
|
||||
b_addc(lex_buf, '\0');
|
||||
/*if ((t.attribute.kwt_idx = iskeyword(b_setmark(lex_buf, 0))) != -1) {
|
||||
t.code = KW_T;
|
||||
b_free(lex_buf);
|
||||
}
|
||||
return t;
|
||||
}*/
|
||||
|
||||
else {
|
||||
t = aa_table[ES](" ");
|
||||
t.attribute.err_lex[0] = c;
|
||||
if (aa_table[state] != NULL) {
|
||||
t = aa_table[state](b_setmark(lex_buf, 0));
|
||||
}
|
||||
else {
|
||||
scerrnum = 1;
|
||||
t = aa_table[ES]("RUN TIME ERROR");
|
||||
}
|
||||
b_free(lex_buf);
|
||||
}
|
||||
|
||||
|
||||
///* special cases or token driven processing */
|
||||
//
|
||||
//WRITE YOUR CODE FOR PROCESSING THE SPECIAL CASES HERE.
|
||||
//COMMENTS AND STRING LITERALS ARE ALSO PROCESSED HERE.
|
||||
//
|
||||
//WHAT FOLLOWS IS A PSEUDO CODE. YOU CAN USE switch STATEMENT
|
||||
//INSTEAD OF if-else TO PROCESS THE SPECIAL CASES
|
||||
//DO NOT FORGET TO COUNT THE PROGRAM LINES
|
||||
//
|
||||
//
|
||||
// IF (c == SOME CHARACTER)
|
||||
// ...
|
||||
// SKIP CHARACTER (FOR EXAMPLE SPACE)
|
||||
// continue;
|
||||
// OR SET TOKEN (SET TOKEN CODE AND TOKEN ATTRIBUTE(IF AVAILABLE))
|
||||
// return t;
|
||||
// EXAMPLE:
|
||||
// if (c == ' ') continue;
|
||||
// if (c == '{'){ t.code = RBR_T; /*no attribute */ return t;
|
||||
// if (c == '+'){ t.code = ART_OP_T; t.attribute.arr_op = PLUS */ return t;
|
||||
// ...
|
||||
//
|
||||
// IF (c == '.') TRY TO PROCESS .AND. or .OR.
|
||||
// IF SOMETHING ELSE FOLLOWS . OR THE LAST . IS MISSING
|
||||
// RETURN AN ERROR TOKEN
|
||||
// IF (c == '!') TRY TO PROCESS COMMENT
|
||||
// IF THE FOLLOWING IS NOT CHAR IS NOT < REPORT AN ERROR
|
||||
// ELSE IN A LOOP SKIP CHARACTERS UNTIL line terminator is found THEN continue;
|
||||
// ...
|
||||
// IF STRING (FOR EXAMPLE, "text") IS FOUND
|
||||
// SET MARK TO MARK THE BEGINNING OF THE STRING
|
||||
// IF THE STRING IS LEGAL
|
||||
// USING b_addc(..)COPY THE text FROM INPUT BUFFER INTO str_LTBL
|
||||
// ADD '\0' at the end make the string C-type string
|
||||
// SET STRING TOKEN
|
||||
// (the attribute of the string token is the offset from
|
||||
// the beginning of the str_LTBL char buffer to the beginning
|
||||
// of the string (TEXT in the example))
|
||||
//
|
||||
// return t;
|
||||
// ELSE
|
||||
// THE STRING LITERAL IS ILLEGAL
|
||||
// SET ERROR TOKEN FOR ILLEGAL STRING (see assignment)
|
||||
// DO NOT STORE THE ILLEGAL STRINg IN THE str_LTBL
|
||||
//
|
||||
// return t;
|
||||
//
|
||||
// IF(c == ANOTHER CHARACTER)
|
||||
// SET TOKEN
|
||||
// return t;
|
||||
/* Process state transition table */
|
||||
|
||||
//IF (c is a digit OR c is a letter){
|
||||
//
|
||||
//SET THE MARK AT THE BEGINING OF THE LEXEME
|
||||
//b_setmark(sc_buf,forward);
|
||||
// ....
|
||||
//CODE YOUR FINATE STATE MACHINE HERE (FSM or DFA)
|
||||
//IT IMPLEMENTS THE FOLLOWING ALGORITHM:
|
||||
//
|
||||
//FSM0. Begin with state = 0 and the input character c
|
||||
//FSM1. Get the next state from the transition table calling
|
||||
// state = get_next_state(state, c, &accept);
|
||||
//FSM2. Get the next character
|
||||
//FSM3. If the state is not accepting (accept == NOAS), go to step FSM1
|
||||
// If the step is accepting, token is found, leave the machine and
|
||||
// call an accepting function as described below.
|
||||
//
|
||||
//
|
||||
//RETRACT getc_offset IF THE FINAL STATE IS A RETRACTING FINAL STATE
|
||||
//GET THE BEGINNING AND THE END OF THE LEXEME
|
||||
//lexstart = b_getmark(sc_buf);
|
||||
//SET lexend TO getc_offset USING AN APPROPRIATE BUFFER FUNCTION
|
||||
//CREATE A TEMPORRARY LEXEME BUFFER HERE;
|
||||
//lex_buf = b_create(...);
|
||||
// . RETRACT getc_offset to the MARK SET PREVIOUSLY AT THE BEGINNING OF THE LEXEME AND
|
||||
// . USING b_getc() COPY THE LEXEME BETWEEN lexstart AND lexend FROM THE INPUT BUFFER INTO lex_buf USING b_addc(...),
|
||||
// . WHEN VID (KEYWORDS INCLUDED), FPL OR IL IS RECOGNIZED
|
||||
// . YOU MUST CALL THE ACCEPTING FUNCTION USING THE ARRAY aa_table ,WHICH
|
||||
// . CONTAINS POINTERS TO FUNCTIONS. THE ARRAY INDEX OF THE FUNCTION TO BE
|
||||
// . CALLED IS STORED IN THE VARIABLE state.
|
||||
// . YOU ARE NOT ALLOWED TO CALL ANY OF THE ACCEPTING FUNCTIONS BY NAME.
|
||||
// . THE ARGUMENT TO THE FUNCTION IS THE STRING STORED IN lex_buf.
|
||||
// ....
|
||||
// b_free(lex_buf);
|
||||
// return t;
|
||||
//
|
||||
// CHECK OTHER CHARS HERE if NEEDED, SET A TOKEN AND RETURN IT.
|
||||
// FOR ILLEGAL CHARACTERS SET ERROR TOKEN.
|
||||
// THE ILLEGAL CHAR IS THE ATTRIBUTE OF THE ERROR TOKEN
|
||||
// IN A CASE OF RUNTIME ERROR, THE FUNCTION MUST STORE
|
||||
// A NON-NEGATIVE NUMBER INTO THE GLOBAL VARIABLE scerrnum
|
||||
// AND RETURN AN ERROR TOKEN. THE ERROR TOKEN ATTRIBUTE MUST
|
||||
// BE THE STRING "RUN TIME ERROR: "
|
||||
}//end while(1)
|
||||
else {
|
||||
t = aa_table[ES](" ");
|
||||
t.attribute.err_lex[0] = c;
|
||||
}
|
||||
return t;
|
||||
}
|
||||
|
||||
|
||||
/* special cases or token driven processing */
|
||||
//
|
||||
//WRITE YOUR CODE FOR PROCESSING THE SPECIAL CASES HERE.
|
||||
//COMMENTS AND STRING LITERALS ARE ALSO PROCESSED HERE.
|
||||
//
|
||||
//WHAT FOLLOWS IS A PSEUDO CODE. YOU CAN USE switch STATEMENT
|
||||
//INSTEAD OF if-else TO PROCESS THE SPECIAL CASES
|
||||
//DO NOT FORGET TO COUNT THE PROGRAM LINES
|
||||
//
|
||||
//
|
||||
// IF (c == SOME CHARACTER)
|
||||
// ...
|
||||
// SKIP CHARACTER (FOR EXAMPLE SPACE)
|
||||
// continue;
|
||||
// OR SET TOKEN (SET TOKEN CODE AND TOKEN ATTRIBUTE(IF AVAILABLE))
|
||||
// return t;
|
||||
// EXAMPLE:
|
||||
// if (c == ' ') continue;
|
||||
// if (c == '{'){ t.code = RBR_T; /*no attribute */ return t;
|
||||
// if (c == '+'){ t.code = ART_OP_T; t.attribute.arr_op = PLUS */ return t;
|
||||
// ...
|
||||
//
|
||||
// IF (c == '.') TRY TO PROCESS .AND. or .OR.
|
||||
// IF SOMETHING ELSE FOLLOWS . OR THE LAST . IS MISSING
|
||||
// RETURN AN ERROR TOKEN
|
||||
// IF (c == '!') TRY TO PROCESS COMMENT
|
||||
// IF THE FOLLOWING IS NOT CHAR IS NOT < REPORT AN ERROR
|
||||
// ELSE IN A LOOP SKIP CHARACTERS UNTIL line terminator is found THEN continue;
|
||||
// ...
|
||||
// IF STRING (FOR EXAMPLE, "text") IS FOUND
|
||||
// SET MARK TO MARK THE BEGINNING OF THE STRING
|
||||
// IF THE STRING IS LEGAL
|
||||
// USING b_addc(..)COPY THE text FROM INPUT BUFFER INTO str_LTBL
|
||||
// ADD '\0' at the end make the string C-type string
|
||||
// SET STRING TOKEN
|
||||
// (the attribute of the string token is the offset from
|
||||
// the beginning of the str_LTBL char buffer to the beginning
|
||||
// of the string (TEXT in the example))
|
||||
//
|
||||
// return t;
|
||||
// ELSE
|
||||
// THE STRING LITERAL IS ILLEGAL
|
||||
// SET ERROR TOKEN FOR ILLEGAL STRING (see assignment)
|
||||
// DO NOT STORE THE ILLEGAL STRINg IN THE str_LTBL
|
||||
//
|
||||
// return t;
|
||||
//
|
||||
// IF(c == ANOTHER CHARACTER)
|
||||
// SET TOKEN
|
||||
// return t;
|
||||
/* Process state transition table */
|
||||
|
||||
//IF (c is a digit OR c is a letter){
|
||||
//
|
||||
//SET THE MARK AT THE BEGINING OF THE LEXEME
|
||||
//b_setmark(sc_buf,forward);
|
||||
// ....
|
||||
//CODE YOUR FINATE STATE MACHINE HERE (FSM or DFA)
|
||||
//IT IMPLEMENTS THE FOLLOWING ALGORITHM:
|
||||
//
|
||||
//FSM0. Begin with state = 0 and the input character c
|
||||
//FSM1. Get the next state from the transition table calling
|
||||
// state = get_next_state(state, c, &accept);
|
||||
//FSM2. Get the next character
|
||||
//FSM3. If the state is not accepting (accept == NOAS), go to step FSM1
|
||||
// If the step is accepting, token is found, leave the machine and
|
||||
// call an accepting function as described below.
|
||||
//
|
||||
//
|
||||
//RETRACT getc_offset IF THE FINAL STATE IS A RETRACTING FINAL STATE
|
||||
//GET THE BEGINNING AND THE END OF THE LEXEME
|
||||
//lexstart = b_getmark(sc_buf);
|
||||
//SET lexend TO getc_offset USING AN APPROPRIATE BUFFER FUNCTION
|
||||
//CREATE A TEMPORRARY LEXEME BUFFER HERE;
|
||||
//lex_buf = b_create(...);
|
||||
// . RETRACT getc_offset to the MARK SET PREVIOUSLY AT THE BEGINNING OF THE LEXEME AND
|
||||
// . USING b_getc() COPY THE LEXEME BETWEEN lexstart AND lexend FROM THE INPUT BUFFER INTO lex_buf USING b_addc(...),
|
||||
// . WHEN VID (KEYWORDS INCLUDED), FPL OR IL IS RECOGNIZED
|
||||
// . YOU MUST CALL THE ACCEPTING FUNCTION USING THE ARRAY aa_table ,WHICH
|
||||
// . CONTAINS POINTERS TO FUNCTIONS. THE ARRAY INDEX OF THE FUNCTION TO BE
|
||||
// . CALLED IS STORED IN THE VARIABLE state.
|
||||
// . YOU ARE NOT ALLOWED TO CALL ANY OF THE ACCEPTING FUNCTIONS BY NAME.
|
||||
// . THE ARGUMENT TO THE FUNCTION IS THE STRING STORED IN lex_buf.
|
||||
// ....
|
||||
// b_free(lex_buf);
|
||||
// return t;
|
||||
//
|
||||
// CHECK OTHER CHARS HERE if NEEDED, SET A TOKEN AND RETURN IT.
|
||||
// FOR ILLEGAL CHARACTERS SET ERROR TOKEN.
|
||||
// THE ILLEGAL CHAR IS THE ATTRIBUTE OF THE ERROR TOKEN
|
||||
// IN A CASE OF RUNTIME ERROR, THE FUNCTION MUST STORE
|
||||
// A NON-NEGATIVE NUMBER INTO THE GLOBAL VARIABLE scerrnum
|
||||
// AND RETURN AN ERROR TOKEN. THE ERROR TOKEN ATTRIBUTE MUST
|
||||
// BE THE STRING "RUN TIME ERROR: "
|
||||
}//end while(1)
|
||||
}
|
||||
|
||||
|
||||
|
|
@ -347,37 +376,37 @@ int get_next_state(int state, char c, int *accept)
|
|||
col = char_class(c);
|
||||
next = st_table[state][col];
|
||||
#ifdef DEBUG
|
||||
printf("Input symbol: %c Row: %d Column: %d Next: %d \n",c,state,col,next);
|
||||
printf("Input symbol: %c Row: %d Column: %d Next: %d \n", c, state, col, next);
|
||||
#endif
|
||||
/*
|
||||
The assert(int test) macro can be used to add run-time diagnostic to programs
|
||||
and to "defend" from producing unexpected results.
|
||||
assert() is a macro that expands to an if statement;
|
||||
if test evaluates to false (zero) , assert aborts the program
|
||||
(by calling abort()) and sends the following message on stderr:
|
||||
/*
|
||||
The assert(int test) macro can be used to add run-time diagnostic to programs
|
||||
and to "defend" from producing unexpected results.
|
||||
assert() is a macro that expands to an if statement;
|
||||
if test evaluates to false (zero) , assert aborts the program
|
||||
(by calling abort()) and sends the following message on stderr:
|
||||
|
||||
Assertion failed: test, file filename, line linenum
|
||||
Assertion failed: test, file filename, line linenum
|
||||
|
||||
The filename and linenum listed in the message are the source file name
|
||||
and line number where the assert macro appears.
|
||||
If you place the #define NDEBUG directive ("no debugging")
|
||||
in the source code before the #include <assert.h> directive,
|
||||
the effect is to comment out the assert statement.
|
||||
*/
|
||||
assert(next != IS);
|
||||
The filename and linenum listed in the message are the source file name
|
||||
and line number where the assert macro appears.
|
||||
If you place the #define NDEBUG directive ("no debugging")
|
||||
in the source code before the #include <assert.h> directive,
|
||||
the effect is to comment out the assert statement.
|
||||
*/
|
||||
assert(next != IS);
|
||||
|
||||
/*
|
||||
The other way to include diagnostics in a program is to use
|
||||
conditional preprocessing as shown bellow. It allows the programmer
|
||||
to send more details describing the run-time problem.
|
||||
Once the program is tested thoroughly #define DEBUG is commented out
|
||||
or #undef DEBUF is used - see the top of the file.
|
||||
*/
|
||||
/*
|
||||
The other way to include diagnostics in a program is to use
|
||||
conditional preprocessing as shown bellow. It allows the programmer
|
||||
to send more details describing the run-time problem.
|
||||
Once the program is tested thoroughly #define DEBUG is commented out
|
||||
or #undef DEBUF is used - see the top of the file.
|
||||
*/
|
||||
#ifdef DEBUG
|
||||
if(next == IS){
|
||||
printf("Scanner Error: Illegal state:\n");
|
||||
printf("Input symbol: %c Row: %d Column: %d\n",c,state,col);
|
||||
exit(1);
|
||||
if (next == IS) {
|
||||
printf("Scanner Error: Illegal state:\n");
|
||||
printf("Input symbol: %c Row: %d Column: %d\n", c, state, col);
|
||||
exit(1);
|
||||
}
|
||||
#endif
|
||||
*accept = as_table[next];
|
||||
|
|
@ -387,6 +416,7 @@ or #undef DEBUF is used - see the top of the file.
|
|||
int char_class(char c)
|
||||
{
|
||||
int val;
|
||||
|
||||
if (isalpha(c))
|
||||
val = 0;
|
||||
else if (c == '0')
|
||||
|
|
@ -415,22 +445,32 @@ REPLACE XX WITH THE CORRESPONDING ACCEPTING STATE NUMBER
|
|||
*/
|
||||
|
||||
Token aa_func02(char lexeme[]) {
|
||||
unsigned int kw_i; /* Variable to contain keyword table index */
|
||||
unsigned int i, kw_idx; /* Variable to contain keyword table index */
|
||||
Token t;
|
||||
char* temp_str;
|
||||
|
||||
if ((kw_i = iskeyword(lexeme)) > -1) { /* Keyword check */
|
||||
#ifdef DEBUG
|
||||
printf("Lexeme: '%s'\n size of: %lu\n", lexeme, sizeof(lexeme));
|
||||
#endif
|
||||
|
||||
kw_idx = iskeyword(lexeme);
|
||||
if (kw_idx != -1) { /* Keyword check */
|
||||
t.code = KW_T;
|
||||
t.attribute.kwt_idx = kw_i;
|
||||
t.attribute.kwt_idx = kw_idx;
|
||||
return t;
|
||||
}
|
||||
/* Not a keyword? Must be AVID*/
|
||||
if ((temp_str = (char*)calloc(VID_LEN + 1, sizeof(char))) == NULL) {
|
||||
return aa_table[ES]("RUN TIME ERROR");
|
||||
}
|
||||
strncpy(temp_str, lexeme, VID_LEN);
|
||||
|
||||
for (i = 0; i < (VID_LEN) && i < strlen(lexeme); i++) {
|
||||
temp_str[i] = lexeme[i];
|
||||
}/*
|
||||
temp_str[strlen(temp_str)] = '\0';*/
|
||||
|
||||
strncpy(t.attribute.vid_lex, temp_str, VID_LEN);
|
||||
t.attribute.vid_lex[strlen(temp_str)] = '\0';
|
||||
free(temp_str);
|
||||
|
||||
switch (lexeme[0]) { /* Read first character of lexeme for implicit type (not used yet?)*/
|
||||
|
|
@ -444,7 +484,7 @@ Token aa_func02(char lexeme[]) {
|
|||
/* Floating point*/
|
||||
break;
|
||||
}
|
||||
|
||||
t.code = AVID_T;
|
||||
return t;
|
||||
|
||||
/*
|
||||
|
|
@ -468,15 +508,21 @@ REPLACE XX WITH THE CORRESPONDING ACCEPTING STATE NUMBER
|
|||
*/
|
||||
Token aa_func03(char lexeme[]) {
|
||||
Token t;
|
||||
unsigned int i;
|
||||
char* temp_str;
|
||||
if ((temp_str = (char*)calloc(VID_LEN + 2, sizeof(char))) == NULL) {
|
||||
return aa_table[ES]("RUN TIME ERROR");
|
||||
}
|
||||
|
||||
strncpy(temp_str, lexeme, VID_LEN);
|
||||
temp_str[strlen(temp_str)] = '#'; /* Add# to end of the SVID */
|
||||
for (i = 0; i < (VID_LEN) && i < strlen(lexeme); i++) {
|
||||
temp_str[i] = lexeme[i];
|
||||
}
|
||||
|
||||
temp_str[strlen(temp_str) - 1] = '#'; /* Add# to end of the SVID */
|
||||
temp_str[strlen(temp_str)] = '\0';
|
||||
|
||||
strncpy(t.attribute.vid_lex, temp_str, VID_LEN);
|
||||
t.attribute.vid_lex[strlen(temp_str)] = '\0';
|
||||
free(temp_str);
|
||||
|
||||
t.code = SVID_T;
|
||||
|
|
@ -506,7 +552,6 @@ Token aa_func05(char lexeme[]) {
|
|||
}
|
||||
t.code = INL_T;
|
||||
t.attribute.int_value = temp_num;
|
||||
|
||||
return t;
|
||||
/*
|
||||
THE FUNCTION MUST CONVERT THE LEXEME REPRESENTING A DECIMAL CONSTANT
|
||||
|
|
@ -532,12 +577,13 @@ Token aa_func08(char lexeme[]) {
|
|||
}
|
||||
|
||||
temp_dbl = atof(lexeme);
|
||||
|
||||
#ifdef DEBUG
|
||||
printf("Lexeme: '%s' | FLT value: %f \n", lexeme, temp_dbl);
|
||||
#endif
|
||||
if ((temp_dbl > FLT_MAX) || (temp_dbl < 0)) {
|
||||
t = aa_table[ES](lexeme);
|
||||
}
|
||||
t.attribute.flt_value = (float)temp_dbl;
|
||||
|
||||
return t;
|
||||
/*
|
||||
THE FUNCTION MUST CONVERT THE LEXEME TO A FLOATING POINT VALUE,
|
||||
|
|
@ -592,16 +638,12 @@ err_lex C-type string.
|
|||
|
||||
/*ACCEPTING FUNCTION FOR THE ERROR TOKEN */
|
||||
|
||||
Token aa_func12(char lexeme[]) {
|
||||
Token aa_func13(char lexeme[]) {
|
||||
Token t;
|
||||
unsigned int i;
|
||||
|
||||
t.code = ERR_T;
|
||||
|
||||
for (i = 0; i < (ERR_LEN - 1) && i < strlen(lexeme); i++) {
|
||||
for (i = 0; i < (ERR_LEN - 1) && i < strlen(lexeme); i++)
|
||||
t.attribute.err_lex[i] = lexeme[i];
|
||||
}
|
||||
|
||||
t.attribute.err_lex[i] = '\0';
|
||||
|
||||
return t;
|
||||
|
|
@ -641,7 +683,7 @@ int iskeyword(char * kw_lexeme) {
|
|||
if (kw_lexeme == NULL) return -1;
|
||||
|
||||
for (i = 0; i < KWT_SIZE; i++) {
|
||||
if (strcmp(kw_table[i], kw_lexeme) == 0) return i;
|
||||
if (strcmp(kw_table[i], kw_lexeme) == 0) { return i; }
|
||||
}
|
||||
return -1;
|
||||
}
|
||||
45
table.h
45
table.h
|
|
@ -34,21 +34,17 @@
|
|||
* .AND., .OR. , SEOF, 'wrong symbol',
|
||||
*/
|
||||
|
||||
|
||||
//REPLACE *ESN* WITH YOUR ERROR STATE NUMBER
|
||||
#define ES 12 /* Error state */
|
||||
#define ES 13 /* Error state */
|
||||
#define IS -1 /* Invalid state */
|
||||
|
||||
/* State transition table definition */
|
||||
|
||||
//REPLACE *CN* WITH YOUR COLUMN NUMBER
|
||||
|
||||
#define TABLE_COLUMNS 7
|
||||
/*transition table - type of states defined in separate table */
|
||||
int st_table[][TABLE_COLUMNS] = {
|
||||
/* INPUT COLUMNS:
|
||||
COLUMN # | 0 | 1 | 2 | 3 | 4 | 5 | 6 |
|
||||
[a-zA-Z]| 0 |[1-7]|[8-9]| . | # | other
|
||||
COLUMN # | 0 | 1 | 2 | 3 | 4 | 5 | 6 |
|
||||
|[a-zA-Z]| 0 |[1-7]|[8-9]| . | # | other|
|
||||
*/
|
||||
/* State 0 */ {1, 6 , 4 , 4 , IS , IS , IS},
|
||||
/* State 1 */ {1, 1 , 1 , 1 , ES , 3 , 2},
|
||||
|
|
@ -57,22 +53,18 @@ int st_table[][TABLE_COLUMNS] = {
|
|||
/* State 4 */ {ES, 4 , 4 , 4 , 7 , 5 , 5},
|
||||
/* State 5 */ {IS, IS , IS, IS, IS , IS , IS},
|
||||
/* State 6 */ {ES, 9 , 9, ES, 7 , ES , 5},
|
||||
/* State 7 */ {ES, 7 , 7, 7, ES , 8 , 8},
|
||||
/* State 7 */ {ES, 7 , 7, 7, 8 , 8 , 8},
|
||||
/* State 8 */ {IS, IS , IS, IS, IS , IS , IS},
|
||||
/* State 9 */ {ES, 9 , 9, ES, ES , ES , 10},
|
||||
/* State 10 */ {IS, IS , IS, IS, IS , IS , IS},
|
||||
/* State 11 */ {IS, IS , IS, IS, IS , IS , IS},
|
||||
/* State 12 */ {IS, IS , IS, IS, IS , IS , IS},
|
||||
/* State 13 */ {IS, IS , IS, IS, IS , IS , IS}
|
||||
//
|
||||
//. YOUR TABLE INITIALIZATION HERE
|
||||
//.
|
||||
///* State N */ {YOUR INITIALIZATION},
|
||||
|
||||
};
|
||||
/* Accepting state table definition */
|
||||
//REPLACE *N1*, *N2*, and *N3* WITH YOUR NUMBERS
|
||||
#define ASWR 2 /* accepting state with retract */
|
||||
#define ASNR 3 /* accepting state with no retract */
|
||||
#define ASWR 1 /* accepting state with retract */
|
||||
#define ASNR 2 /* accepting state with no retract */
|
||||
#define NOAS 0 /* not accepting state */
|
||||
|
||||
int as_table[] = {
|
||||
|
|
@ -96,19 +88,12 @@ int as_table[] = {
|
|||
|
||||
/* Accepting action function declarations */
|
||||
|
||||
//FOR EACH OF YOUR ACCEPTING STATES YOU MUST PROVIDE
|
||||
//ONE FUNCTION PROTOTYPE. THEY ALL RETURN Token AND TAKE
|
||||
//ONE ARGUMENT: A string REPRESENTING A TOKEN LEXEME.
|
||||
|
||||
// Example: Token aa_funcXX(char *lexeme);
|
||||
|
||||
Token aa_func02(char* lexeme); // VID AVID/KW
|
||||
Token aa_func03(char *lexeme); // VID SVID
|
||||
Token aa_func05(char *lexeme); // DIL
|
||||
Token aa_func08(char *lexeme); // FPL
|
||||
Token aa_func10(char *lexeme); // OIL
|
||||
Token aa_func12(char *lexeme); // ES
|
||||
//Replace XX with the number of the accepting state: 02, 03 and so on.
|
||||
Token aa_func02(char* lexeme); /* AVID/KW */
|
||||
Token aa_func03(char* lexeme); /* SVID */
|
||||
Token aa_func05(char* lexeme); /* DIL */
|
||||
Token aa_func08(char* lexeme); /* FPL */
|
||||
Token aa_func10(char* lexeme); /* OIL */
|
||||
Token aa_func13(char* lexeme); /* ES */
|
||||
|
||||
/* defining a new type: pointer to function (of one char * argument)
|
||||
returning Token
|
||||
|
|
@ -136,8 +121,8 @@ PTR_AAF aa_table[] = {
|
|||
/* State 9 */ NULL,
|
||||
/* State 10 */ aa_func10,
|
||||
/* State 11 */ NULL,
|
||||
/* State 12 */ aa_func12,
|
||||
/* State 13 */ NULL
|
||||
/* State 12 */ NULL,
|
||||
/* State 13 */ aa_func13
|
||||
|
||||
//HERE YOU MUST PROVIDE AN INITIALIZATION FOR AN ARRAY OF POINTERS
|
||||
//TO ACCEPTING FUNCTIONS. THE ARRAY HAS THE SAME SIZE AS as_table[ ].
|
||||
|
|
|
|||
Loading…
Reference in New Issue