【文件属性】：
文件名称：JSMin（javaScript文件压缩）
文件大小：11KB
文件格式：ZIP
更新时间：2014-05-14 10:24:08
javaScritpt筛选程序 JSmin
由Douglas Crockford创建的JSMin是一个筛选程序，用于JavaScript文件中删除注释和不必要的空格。这个程序通常能够使文件大小减半，从而节省下载时间。
压缩包里包含了用C写的源码，及可执行程序
由于看到三条评论说没有用，在里我必须说明一下，下面那三个白痴肯定没学过c语言，更没用过c编译好的.exe文件。
以下是c里的源码大家可以先看觉得可用再下
#include
#include
static int theA;
static int theB;
static int theLookahead = EOF;
/* isAlphanum -- return true if the character is a letter, digit, underscore,
dollar sign, or non-ASCII character.
*/
static int
isAlphanum(int c)
{
return ((c >= 'a' && c <= 'z') || (c >= '0' && c <= '9') ||
(c >= 'A' && c <= 'Z') || c == '_' || c == '$' || c == '\\' ||
c > 126);
}
/* get -- return the next character from stdin. Watch out for lookahead. If
the character is a control character, translate it to a space or
linefeed.
*/
static int
get()
{
int c = theLookahead;
theLookahead = EOF;
if (c == EOF) {
c = getc(stdin);
}
if (c >= ' ' || c == '\n' || c == EOF) {
return c;
}
if (c == '\r') {
return '\n';
}
return ' ';
}
/* peek -- get the next character without getting it.
*/
static int
peek()
{
theLookahead = get();
return theLookahead;
}
/* next -- get the next character, excluding comments. peek() is used to see
if a '/' is followed by a '/' or '*'.
*/
static int
next()
{
int c = get();
if (c == '/') {
switch (peek()) {
case '/':
for (;;) {
c = get();
if (c <= '\n') {
return c;
}
}
case '*':
get();
for (;;) {
switch (get()) {
case '*':
if (peek() == '/') {
get();
return ' ';
}
break;
case EOF:
fprintf(stderr, "Error: JSMIN Unterminated comment.\n");
exit(1);
}
}
default:
return c;
}
}
return c;
}
/* action -- do something! What you do is determined by the argument:
1 Output A. Copy B to A. Get the next B.
2 Copy B to A. Get the next B. (Delete A).
3 Get the next B. (Delete B).
action treats a string as a single character. Wow!
action recognizes a regular expression if it is preceded by ( or , or =.
*/
static void
action(int d)
{
switch (d) {
case 1:
putc(theA, stdout);
case 2:
theA = theB;
if (theA == '\'' || theA == '"') {
for (;;) {
putc(theA, stdout);
theA = get();
if (theA == theB) {
break;
}
if (theA == '\\') {
putc(theA, stdout);
theA = get();
}
if (theA == EOF) {
fprintf(stderr, "Error: JSMIN unterminated string literal.");
exit(1);
}
}
}
case 3:
theB = next();
if (theB == '/' && (theA == '(' || theA == ',' || theA == '=' ||
theA == ':' || theA == '[' || theA == '!' ||
theA == '&' || theA == '|' || theA == '?' ||
theA == '{' || theA == '}' || theA == ';' ||
theA == '\n')) {
putc(theA, stdout);
putc(theB, stdout);
for (;;) {
theA = get();
if (theA == '[') {
for (;;) {
putc(theA, stdout);
theA = get();
if (theA == ']') {
break;
}
if (theA == '\\') {
putc(theA, stdout);
theA = get();
}
if (theA == EOF) {
fprintf(stderr,
"Error: JSMIN unterminated set in Regular Expression literal.\n");
exit(1);
}
}
} else if (theA == '/') {
break;
} else if (theA =='\\') {
putc(theA, stdout);
theA = get();
}
if (theA == EOF) {
fprintf(stderr,
"Error: JSMIN unterminated Regular Expression literal.\n");
exit(1);
}
putc(theA, stdout);
}
theB = next();
}
}
}
/* jsmin -- Copy the input to the output, deleting the characters which are
insignificant to JavaScript. Comments will be removed. Tabs will be
replaced with spaces. Carriage returns will be replaced with linefeeds.
Most spaces and linefeeds will be removed.
*/
static void
jsmin()
{
theA = '\n';
action(3);
while (theA != EOF) {
switch (theA) {
case ' ':
if (isAlphanum(theB)) {
action(1);
} else {
action(2);
}
break;
case '\n':
switch (theB) {
case '{':
case '[':
case '(':
case '+':
case '-':
action(1);
break;
case ' ':
action(3);
break;
default:
if (isAlphanum(theB)) {
action(1);
} else {
action(2);
}
}
break;
default:
switch (theB) {
case ' ':
if (isAlphanum(theA)) {
action(1);
break;
}
action(3);
break;
case '\n':
switch (theA) {
case '}':
case ']':
case ')':
case '+':
case '-':
case '"':
case '\'':
action(1);
break;
default:
if (isAlphanum(theA)) {
action(1);
} else {
action(3);
}
}
break;
default:
action(1);
break;
}
}
}
}
/* main -- Output any command line arguments as comments
and then minify the input.
*/
extern int
main(int argc, char* argv[])
{
int i;
for (i = 1; i < argc; i += 1) {
fprintf(stdout, "// %s\n", argv[i]);
}
jsmin();
return 0;
}
