279 lines
7.2 KiB
C
279 lines
7.2 KiB
C
/* jsmin.c
|
|
2007-12-04
|
|
|
|
Copyright (c) 2002 Douglas Crockford (www.crockford.com)
|
|
|
|
Permission is hereby granted, free of charge, to any person obtaining a copy of
|
|
this software and associated documentation files (the "Software"), to deal in
|
|
the Software without restriction, including without limitation the rights to
|
|
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
|
|
of the Software, and to permit persons to whom the Software is furnished to do
|
|
so, subject to the following conditions:
|
|
|
|
The above copyright notice and this permission notice shall be included in all
|
|
copies or substantial portions of the Software.
|
|
|
|
The Software shall be used for Good, not Evil.
|
|
|
|
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
SOFTWARE.
|
|
*/
|
|
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
|
|
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 <= '\n') {
|
|
fprintf(stderr,
|
|
"Error: JSMIN unterminated string literal: %c\n", theA);
|
|
exit(1);
|
|
}
|
|
if (theA == '\\') {
|
|
putc(theA, stdout);
|
|
theA = get();
|
|
if (theA <= '\n') {
|
|
fprintf(stderr,
|
|
"Error: JSMIN unterminated string literal: %c\n", '\\');
|
|
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 == '/') {
|
|
break;
|
|
} else if (theA =='\\') {
|
|
putc(theA, stdout);
|
|
theA = get();
|
|
} else if (theA <= '\n') {
|
|
fprintf(stderr,
|
|
"Error: JSMIN unterminated Regular Expression literal.\n", theA);
|
|
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;
|
|
}
|