《Flex&Bison》例2-2代码

该示例统计一个或多个输入文件中的行数、单词数及字符数。最后汇总的所有文件的行数、单词数及字符数。

如果没有提供输入文件,则从标准输入获取输入。

 

CMakeLists.txt

CMAKE_MINIMUM_REQUIRED(VERSION 2.6)
SET(PROJ_NAME fb2-2)
PROJECT(${PROJ_NAME})
find_package(Flex)
FLEX_TARGET(MyScanner ${PROJ_NAME}.txt ${CMAKE_CURRENT_BINARY_DIR}/lexer.c)
ADD_EXECUTABLE(${PROJ_NAME} ${FLEX_MyScanner_OUTPUTS})


fb2-2.txt

%option noyywrap
%{
int chars = 0;
int words = 0;
int lines = 0;

int totchars = 0;
int totwords = 0;
int totlines = 0;
%}
%%

[a-zA-Z]+ { ++words; chars += yyleng; }
\n { ++lines; ++chars; }
. { ++chars; }

%%

int main(int argc, char ** argv)
{
    int i;
    if (argc<2)
    {
        yylex();
	printf("%8d%8d%8d\n", lines, words, chars);
	return 0;
    }

    for (i=1; i<argc; ++i)
    {
        FILE * f = fopen(argv[i], "r");
	if (!f)
	{
	    perror(argv[i]);
	    return 1;
	}
	yyrestart(f);
	yylex();
	fclose(f);
	printf("%8d%8d%8d %s\n", lines, words, chars, argv[i]);
	totchars += chars; chars = 0;
	totwords += words; words = 0;
	totlines += lines; lines = 0;
    }

    if (argc>1)
    {
	printf("%8d%8d%8d total\n", totlines, totwords, totchars);
    }
    return 0;
}


 

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