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going to do a little "real" token manipulation.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,130 @@ | ||
| D [0-9] | ||
| L [a-zA-Z_] | ||
| H [a-fA-F0-9] | ||
| E [Ee][+-]?{D}+ | ||
| FS (f|F|l|L) | ||
| IS (u|U|l|L)* | ||
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| %option noyywrap | ||
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| %{ | ||
| #include <stdio.h> | ||
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| void doit (void); | ||
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| %} | ||
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| %% | ||
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| "auto" { doit(); } | ||
| "break" { doit(); } | ||
| "case" { doit(); } | ||
| "char" { doit(); } | ||
| "const" { doit(); } | ||
| "continue" { doit(); } | ||
| "default" { doit(); } | ||
| "do" { doit(); } | ||
| "double" { doit(); } | ||
| "else" { doit(); } | ||
| "enum" { doit(); } | ||
| "extern" { doit(); } | ||
| "float" { doit(); } | ||
| "for" { doit(); } | ||
| "goto" { doit(); } | ||
| "if" { doit(); } | ||
| "int" { doit(); } | ||
| "long" { doit(); } | ||
| "register" { doit(); } | ||
| "return" { doit(); } | ||
| "short" { doit(); } | ||
| "signed" { doit(); } | ||
| "sizeof" { doit(); } | ||
| "static" { doit(); } | ||
| "struct" { doit(); } | ||
| "switch" { doit(); } | ||
| "typedef" { doit(); } | ||
| "union" { doit(); } | ||
| "unsigned" { doit(); } | ||
| "void" { doit(); } | ||
| "volatile" { doit(); } | ||
| "while" { doit(); } | ||
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| {L}({L}|{D})* { doit(); } | ||
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| 0[xX]{H}+{IS}? { doit(); } | ||
| 0{D}+{IS}? { doit(); } | ||
| {D}+{IS}? { doit(); } | ||
| L?'(\\.|[^\\'])+' { doit(); } | ||
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| {D}+{E}{FS}? { doit(); } | ||
| {D}*"."{D}+({E})?{FS}? { doit(); } | ||
| {D}+"."{D}*({E})?{FS}? { doit(); } | ||
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| L?\"(\\.|[^\\"])*\" { doit(); } | ||
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| "..." { doit(); } | ||
| ">>=" { doit(); } | ||
| "<<=" { doit(); } | ||
| "+=" { doit(); } | ||
| "-=" { doit(); } | ||
| "*=" { doit(); } | ||
| "/=" { doit(); } | ||
| "%=" { doit(); } | ||
| "&=" { doit(); } | ||
| "^=" { doit(); } | ||
| "|=" { doit(); } | ||
| ">>" { doit(); } | ||
| "<<" { doit(); } | ||
| "++" { doit(); } | ||
| "--" { doit(); } | ||
| "->" { doit(); } | ||
| "&&" { doit(); } | ||
| "||" { doit(); } | ||
| "<=" { doit(); } | ||
| ">=" { doit(); } | ||
| "==" { doit(); } | ||
| "!=" { doit(); } | ||
| ";" { doit(); } | ||
| ("{"|"<%") { doit(); } | ||
| ("}"|"%>") { doit(); } | ||
| "," { doit(); } | ||
| ":" { doit(); } | ||
| "=" { doit(); } | ||
| "(" { doit(); } | ||
| ")" { doit(); } | ||
| ("["|"<:") { doit(); } | ||
| ("]"|":>") { doit(); } | ||
| "." { doit(); } | ||
| "&" { doit(); } | ||
| "!" { doit(); } | ||
| "~" { doit(); } | ||
| "-" { doit(); } | ||
| "+" { doit(); } | ||
| "*" { doit(); } | ||
| "/" { doit(); } | ||
| "%" { doit(); } | ||
| "<" { doit(); } | ||
| ">" { doit(); } | ||
| "^" { doit(); } | ||
| "|" { doit(); } | ||
| "?" { doit(); } | ||
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| [ \t\v\n\f] { } | ||
| . { exit (-2); } | ||
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| %% | ||
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| int count = 0; | ||
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| void doit (void) | ||
| { | ||
| // printf ("%s ", yytext); | ||
| count++; | ||
| } | ||
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| int main (int argc, char *argv[]) { | ||
| yyin = stdin; | ||
| yylex(); | ||
| printf ("%d\n", count); | ||
| return 0; | ||
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,2 @@ | ||
| flex c.lex | ||
| gcc -O2 lex.yy.c -o clex |