lex yacc tutorial by Tom Niemann

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KTU Compiler Lab CSL411 - Dr Binu V P

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Preamble:  This course aims to offer students hands-on experience on compiler design concepts.Students will be able to familiarize with tools such as LEX and YACC and automate different phases of a compiler. This course helps the learners to enhance the capability to design and implement a compiler. Prerequisite: A sound knowledge in C programming, Data Structures, Formal languages and Automata Theory and Compiler design. About Me Syllabus and practise questions Lex yacc tutorial by Tom Neimann How to Install  flex and Bison Introduction to lex/flex Format of lex input files Lex Regular Expressions Input Matching in Lex Actions in Lex File Start Conditions in Lex Values available to the user in action section Reading and writing files Lex/Flex  Programs     Simple lexical analyser in C     count number of lines ,words and characters     check for valid identifiers     count the identifiers     converting the substring "abc...
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lexical analyzer for a c program

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 This program identifies tokens in a C program ignoring white spaces and comments.The input C program is given as argument ******************************* %{ #include <stdio.h> %} %option noyywrap /* Define regular expressions for different token types */ DIGIT      [0-9] LETTER     [a-zA-Z] IDENTIFIER {LETTER}({LETTER}|{DIGIT})* NUMBER     {DIGIT}+ WHITESPACE [ \t\n]+ COMMENT1    "//".* COMMENT2  "/*"([^*]|\*+[^/*])*\*+"/" %% {WHITESPACE}        { /* Ignore whitespace */ } {COMMENT1}           { /* Ignore comments */ } {COMMENT2}           { /* Ignore comments */ } "int"               { printf("TOKEN_INT\n"); } "return"            { printf("TOKEN_RETURN\n"); } "if"                { printf("TOKEN_IF\n"); } "else"    ...
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Simple Lexical Analyser in C

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#include <stdio.h> #include <ctype.h> #include <string.h> #include <stdlib.h> #define MAX_TOKEN_LENGTH 100 // Token types typedef enum {     TOKEN_KEYWORD,     TOKEN_IDENTIFIER,     TOKEN_NUMBER,     TOKEN_STRING_LITERAL,     TOKEN_CHAR_LITERAL,     TOKEN_OPERATOR,     TOKEN_PUNCTUATION,     TOKEN_UNKNOWN,     TOKEN_END } TokenType; // Token structure typedef struct {     TokenType type;     char value[MAX_TOKEN_LENGTH]; } Token; // Keywords in C const char *keywords[] = {     "auto", "break", "case", "char", "const", "continue", "default",     "do", "double", "else", "enum", "extern", "float", "for", "goto",     "if", "int", "long", "register", "return", "short", "signed",     "sizeof", "static", "struct", "swi...
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