parser/c_compiler/lexer.l
author Markus Bröker <mbroeker@largo.dyndns.tv>
Fri, 19 Nov 2010 00:11:16 +0100
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permissions -rw-r--r--
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%{
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    #include <prototypes.h>
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    #include "parser.h"
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    int column = 0;
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    int c;
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%}
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D                        [0-9]
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L                        [a-zA-Z_]
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H                        [a-fA-F0-9]
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E                        [Ee][+-]?{D}+
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FS                       (f|F|l|L)
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IS                       (u|U|l|L)*
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%%
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"/*"                     { comment(); }
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"#include <"             { c = input(); while ( c != '>') c = input();  }
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"#include \""            { c = input(); while ( c != '\"') c = input(); }
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"auto"                   { count(); return(AUTO); }
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"break"                  { count(); return(BREAK); }
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"case"                   { count(); return(CASE); }
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"char"                   { count(); return(CHAR); }
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"const"                  { count(); return(CONST); }
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"continue"               { count(); return(CONTINUE); }
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"default"                { count(); return(DEFAULT); }
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"do"                     { count(); return(DO); }
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"double"                 { count(); return(DOUBLE); }
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"else"                   { count(); return(ELSE); }
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"enum"                   { count(); return(ENUM); }
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"extern"                 { count(); return(EXTERN); }
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"float"                  { count(); return(FLOAT); }
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"for"                    { count(); return(FOR); }
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"goto"                   { count(); return(GOTO); }
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"if"                     { count(); return(IF); }
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"int"                    { count(); return(INT); }
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"long"                   { count(); return(LONG); }
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"register"               { count(); return(REGISTER); }
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"return"                 { count(); return(RETURN); }
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"short"                  { count(); return(SHORT); }
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"signed"                 { count(); return(SIGNED); }
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"sizeof"                 { count(); return(SIZEOF); }
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"static"                 { count(); return(STATIC); }
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"struct"                 { count(); return(STRUCT); }
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"switch"                 { count(); return(SWITCH); }
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"typedef"                { count(); return(TYPEDEF); }
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"union"                  { count(); return(UNION); }
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"unsigned"               { count(); return(UNSIGNED); }
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"void"                   { count(); return(VOID); }
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"volatile"               { count(); return(VOLATILE); }
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"while"                  { count(); return(WHILE); }
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{L}({L}|{D})*            { count(); return(check_type()); }
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0[xX]{H}+{IS}?           { count(); return(CONSTANT); }
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0{D}+{IS}?               { count(); return(CONSTANT); }
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{D}+{IS}?                { count(); return(CONSTANT); }
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'(\\.|[^\\'])+'          { count(); return(CONSTANT); }
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{D}+{E}{FS}?             { count(); return(CONSTANT); }
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{D}*"."{D}+({E})?{FS}?   { count(); return(CONSTANT); }
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{D}+"."{D}*({E})?{FS}?   { count(); return(CONSTANT); }
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\"(\\.|[^\\"])*\"        { count(); return(STRING_LITERAL); }
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">>="                    { count(); return(RIGHT_ASSIGN); }
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"<<="                    { count(); return(LEFT_ASSIGN); }
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"+="                     { count(); return(ADD_ASSIGN); }
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"-="                     { count(); return(SUB_ASSIGN); }
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"*="                     { count(); return(MUL_ASSIGN); }
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"/="                     { count(); return(DIV_ASSIGN); }
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"%="                     { count(); return(MOD_ASSIGN); }
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"&="                     { count(); return(AND_ASSIGN); }
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"^="                     { count(); return(XOR_ASSIGN); }
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"|="                     { count(); return(OR_ASSIGN); }
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">>"                     { count(); return(RIGHT_OP); }
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"<<"                     { count(); return(LEFT_OP); }
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"++"                     { count(); return(INC_OP); }
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"--"                     { count(); return(DEC_OP); }
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"->"                     { count(); return(PTR_OP); }
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"&&"                     { count(); return(AND_OP); }
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"||"                     { count(); return(OR_OP); }
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"<="                     { count(); return(LE_OP); }
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">="                     { count(); return(GE_OP); }
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"=="                     { count(); return(EQ_OP); }
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"!="                     { count(); return(NE_OP); }
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";"                      { count(); return(';'); }
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"{"                      { count(); return('{'); }
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"}"                      { count(); return('}'); }
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","                      { count(); return(','); }
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":"                      { count(); return(':'); }
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"="                      { count(); return('='); }
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"("                      { count(); return('('); }
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")"                      { count(); return(')'); }
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"["                      { count(); return('['); }
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"]"                      { count(); return(']'); }
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"."                      { count(); return('.'); }
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"&"                      { count(); return('&'); }
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"!"                      { count(); return('!'); }
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"~"                      { count(); return('~'); }
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"-"                      { count(); return('-'); }
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"+"                      { count(); return('+'); }
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"*"                      { count(); return('*'); }
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"/"                      { count(); return('/'); }
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"%"                      { count(); return('%'); }
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"<"                      { count(); return('<'); }
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">"                      { count(); return('>'); }
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"^"                      { count(); return('^'); }
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"|"                      { count(); return('|'); }
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"?"                      { count(); return('?'); }
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[ \t\v\n\f]              { count(); }
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.                        { printf ("Unknown Token: %s\n", yytext); }
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%%
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int yywrap()
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{
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    /* stop after eof */
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    return 1;
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}
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int count()
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{
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    int i;
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    for (i = 0; yytext[i] != '\0'; i++)
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        if (yytext[i] == '\n')
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            column = 0;
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        else if (yytext[i] == '\t')
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            column += 4 - (column % 4);
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        else
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            column++;
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    return column;
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}
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int check_type()
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{
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    return IDENTIFIER;
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}
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void comment()
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{
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    int c;
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    c = input();
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    do {
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        while ( c != '*')
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            c = input();
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        c=input();
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    } while(c != '/');
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}