319 lines
8.7 KiB
C
319 lines
8.7 KiB
C
/* jsmin.c
|
|
2019-10-30
|
|
|
|
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 the_a;
|
|
static int the_b;
|
|
static int look_ahead = EOF;
|
|
static int the_x = EOF;
|
|
static int the_y = EOF;
|
|
|
|
|
|
static void error(char* string) {
|
|
fputs("JSMIN Error: ", stderr);
|
|
fputs(string, stderr);
|
|
fputc('\n', stderr);
|
|
exit(1);
|
|
}
|
|
|
|
/* is_alphanum -- return true if the character is a letter, digit, underscore,
|
|
dollar sign, or non-ASCII character.
|
|
*/
|
|
|
|
static int is_alphanum(int codeunit) {
|
|
return (
|
|
(codeunit >= 'a' && codeunit <= 'z')
|
|
|| (codeunit >= '0' && codeunit <= '9')
|
|
|| (codeunit >= 'A' && codeunit <= 'Z')
|
|
|| codeunit == '_'
|
|
|| codeunit == '$'
|
|
|| codeunit == '\\'
|
|
|| codeunit > 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 codeunit = look_ahead;
|
|
look_ahead = EOF;
|
|
if (codeunit == EOF) {
|
|
codeunit = getc(stdin);
|
|
}
|
|
if (codeunit >= ' ' || codeunit == '\n' || codeunit == EOF) {
|
|
return codeunit;
|
|
}
|
|
if (codeunit == '\r') {
|
|
return '\n';
|
|
}
|
|
return ' ';
|
|
}
|
|
|
|
|
|
/* peek -- get the next character without advancing.
|
|
*/
|
|
|
|
static int peek() {
|
|
look_ahead = get();
|
|
return look_ahead;
|
|
}
|
|
|
|
|
|
/* next -- get the next character, excluding comments. peek() is used to see
|
|
if a '/' is followed by a '/' or '*'.
|
|
*/
|
|
|
|
static int next() {
|
|
int codeunit = get();
|
|
if (codeunit == '/') {
|
|
switch (peek()) {
|
|
case '/':
|
|
for (;;) {
|
|
codeunit = get();
|
|
if (codeunit <= '\n') {
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
case '*':
|
|
get();
|
|
while (codeunit != ' ') {
|
|
switch (get()) {
|
|
case '*':
|
|
if (peek() == '/') {
|
|
get();
|
|
codeunit = ' ';
|
|
}
|
|
break;
|
|
case EOF:
|
|
error("Unterminated comment.");
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
the_y = the_x;
|
|
the_x = codeunit;
|
|
return codeunit;
|
|
}
|
|
|
|
|
|
/* 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.
|
|
action recognizes a regular expression if it is preceded by the likes of
|
|
'(' or ',' or '='.
|
|
*/
|
|
|
|
static void action(int determined) {
|
|
switch (determined) {
|
|
case 1:
|
|
putc(the_a, stdout);
|
|
if (
|
|
(the_y == '\n' || the_y == ' ')
|
|
&& (the_a == '+' || the_a == '-' || the_a == '*' || the_a == '/')
|
|
&& (the_b == '+' || the_b == '-' || the_b == '*' || the_b == '/')
|
|
) {
|
|
putc(the_y, stdout);
|
|
}
|
|
case 2:
|
|
the_a = the_b;
|
|
if (the_a == '\'' || the_a == '"' || the_a == '`') {
|
|
for (;;) {
|
|
putc(the_a, stdout);
|
|
the_a = get();
|
|
if (the_a == the_b) {
|
|
break;
|
|
}
|
|
if (the_a == '\\') {
|
|
putc(the_a, stdout);
|
|
the_a = get();
|
|
}
|
|
if (the_a == EOF) {
|
|
error("Unterminated string literal.");
|
|
}
|
|
}
|
|
}
|
|
case 3:
|
|
the_b = next();
|
|
if (the_b == '/' && (
|
|
the_a == '(' || the_a == ',' || the_a == '=' || the_a == ':'
|
|
|| the_a == '[' || the_a == '!' || the_a == '&' || the_a == '|'
|
|
|| the_a == '?' || the_a == '+' || the_a == '-' || the_a == '~'
|
|
|| the_a == '*' || the_a == '/' || the_a == '{' || the_a == '}'
|
|
|| the_a == ';'
|
|
)) {
|
|
putc(the_a, stdout);
|
|
if (the_a == '/' || the_a == '*') {
|
|
putc(' ', stdout);
|
|
}
|
|
putc(the_b, stdout);
|
|
for (;;) {
|
|
the_a = get();
|
|
if (the_a == '[') {
|
|
for (;;) {
|
|
putc(the_a, stdout);
|
|
the_a = get();
|
|
if (the_a == ']') {
|
|
break;
|
|
}
|
|
if (the_a == '\\') {
|
|
putc(the_a, stdout);
|
|
the_a = get();
|
|
}
|
|
if (the_a == EOF) {
|
|
error(
|
|
"Unterminated set in Regular Expression literal."
|
|
);
|
|
}
|
|
}
|
|
} else if (the_a == '/') {
|
|
switch (peek()) {
|
|
case '/':
|
|
case '*':
|
|
error(
|
|
"Unterminated set in Regular Expression literal."
|
|
);
|
|
}
|
|
break;
|
|
} else if (the_a =='\\') {
|
|
putc(the_a, stdout);
|
|
the_a = get();
|
|
}
|
|
if (the_a == EOF) {
|
|
error("Unterminated Regular Expression literal.");
|
|
}
|
|
putc(the_a, stdout);
|
|
}
|
|
the_b = 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() {
|
|
if (peek() == 0xEF) {
|
|
get();
|
|
get();
|
|
get();
|
|
}
|
|
the_a = '\n';
|
|
action(3);
|
|
while (the_a != EOF) {
|
|
switch (the_a) {
|
|
case ' ':
|
|
action(
|
|
is_alphanum(the_b)
|
|
? 1
|
|
: 2
|
|
);
|
|
break;
|
|
case '\n':
|
|
switch (the_b) {
|
|
case '{':
|
|
case '[':
|
|
case '(':
|
|
case '+':
|
|
case '-':
|
|
case '!':
|
|
case '~':
|
|
action(1);
|
|
break;
|
|
case ' ':
|
|
action(3);
|
|
break;
|
|
default:
|
|
action(
|
|
is_alphanum(the_b)
|
|
? 1
|
|
: 2
|
|
);
|
|
}
|
|
break;
|
|
default:
|
|
switch (the_b) {
|
|
case ' ':
|
|
action(
|
|
is_alphanum(the_a)
|
|
? 1
|
|
: 3
|
|
);
|
|
break;
|
|
case '\n':
|
|
switch (the_a) {
|
|
case '}':
|
|
case ']':
|
|
case ')':
|
|
case '+':
|
|
case '-':
|
|
case '"':
|
|
case '\'':
|
|
case '`':
|
|
action(1);
|
|
break;
|
|
default:
|
|
action(
|
|
is_alphanum(the_a)
|
|
? 1
|
|
: 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;
|
|
}
|