/* jsmin.c
- 2011-09-30
+ 2019-10-30
-Copyright (c) 2002 Douglas Crockford (www.crockford.com)
+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
#include <stdlib.h>
#include <stdio.h>
-static int theA;
-static int theB;
-static int theLookahead = EOF;
+static int the_a;
+static int the_b;
+static int look_ahead = EOF;
+static int the_x = EOF;
+static int the_y = EOF;
-/* isAlphanum -- return true if the character is a letter, digit, underscore,
+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
-isAlphanum(int c)
-{
- return ((c >= 'a' && c <= 'z') || (c >= '0' && c <= '9') ||
- (c >= 'A' && c <= 'Z') || c == '_' || c == '$' || c == '\\' ||
- c > 126);
+static int is_alphanum(int codeunit) {
+ return (
+ (codeunit >= 'a' && codeunit <= 'z')
+ || (codeunit >= '0' && codeunit <= '9')
+ || (codeunit >= 'A' && codeunit <= 'Z')
+ || codeunit == '_'
+ || codeunit == '$'
+ || codeunit == '\\'
+ || codeunit > 126
+ );
}
linefeed.
*/
-static int
-get()
-{
- int c = theLookahead;
- theLookahead = EOF;
- if (c == EOF) {
- c = getc(stdin);
+static int get() {
+ int codeunit = look_ahead;
+ look_ahead = EOF;
+ if (codeunit == EOF) {
+ codeunit = getc(stdin);
}
- if (c >= ' ' || c == '\n' || c == EOF) {
- return c;
+ if (codeunit >= ' ' || codeunit == '\n' || codeunit == EOF) {
+ return codeunit;
}
- if (c == '\r') {
+ if (codeunit == '\r') {
return '\n';
}
return ' ';
}
-/* peek -- get the next character without getting it.
+/* peek -- get the next character without advancing.
*/
-static int
-peek()
-{
- theLookahead = get();
- return theLookahead;
+static int peek() {
+ look_ahead = get();
+ return look_ahead;
}
if a '/' is followed by a '/' or '*'.
*/
-static int
-next()
-{
- int c = get();
- if (c == '/') {
+static int next() {
+ int codeunit = get();
+ if (codeunit == '/') {
switch (peek()) {
case '/':
for (;;) {
- c = get();
- if (c <= '\n') {
- return c;
+ codeunit = get();
+ if (codeunit <= '\n') {
+ break;
}
}
+ break;
case '*':
get();
- for (;;) {
+ while (codeunit != ' ') {
switch (get()) {
case '*':
if (peek() == '/') {
get();
- return ' ';
+ codeunit = ' ';
}
break;
case EOF:
- fprintf(stderr, "Error: JSMIN Unterminated comment.\n");
- exit(1);
+ error("Unterminated comment.");
}
}
- default:
- return c;
+ break;
}
}
- return c;
+ the_y = the_x;
+ the_x = codeunit;
+ return codeunit;
}
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 =.
+ 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 d)
-{
- switch (d) {
+static void action(int determined) {
+ switch (determined) {
case 1:
- putc(theA, stdout);
+ 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:
- theA = theB;
- if (theA == '\'' || theA == '"' || theA == '`') {
+ the_a = the_b;
+ if (the_a == '\'' || the_a == '"' || the_a == '`') {
for (;;) {
- putc(theA, stdout);
- theA = get();
- if (theA == theB) {
+ putc(the_a, stdout);
+ the_a = get();
+ if (the_a == the_b) {
break;
}
- if (theA == '\\') {
- putc(theA, stdout);
- theA = get();
+ if (the_a == '\\') {
+ putc(the_a, stdout);
+ the_a = get();
}
- if (theA == EOF) {
- fprintf(stderr, "Error: JSMIN unterminated string literal.");
- exit(1);
+ if (the_a == EOF) {
+ error("Unterminated string literal.");
}
}
}
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);
+ 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 (;;) {
- theA = get();
- if (theA == '[') {
+ the_a = get();
+ if (the_a == '[') {
for (;;) {
- putc(theA, stdout);
- theA = get();
- if (theA == ']') {
+ putc(the_a, stdout);
+ the_a = get();
+ if (the_a == ']') {
break;
}
- if (theA == '\\') {
- putc(theA, stdout);
- theA = get();
+ if (the_a == '\\') {
+ putc(the_a, stdout);
+ the_a = get();
}
- if (theA == EOF) {
- fprintf(stderr,
- "Error: JSMIN unterminated set in Regular Expression literal.\n");
- exit(1);
+ if (the_a == EOF) {
+ error(
+ "Unterminated set in Regular Expression literal."
+ );
}
}
- } else if (theA == '/') {
+ } else if (the_a == '/') {
+ switch (peek()) {
+ case '/':
+ case '*':
+ error(
+ "Unterminated set in Regular Expression literal."
+ );
+ }
break;
- } else if (theA =='\\') {
- putc(theA, stdout);
- theA = get();
+ } else if (the_a =='\\') {
+ putc(the_a, stdout);
+ the_a = get();
}
- if (theA == EOF) {
- fprintf(stderr,
- "Error: JSMIN unterminated Regular Expression literal.\n");
- exit(1);
+ if (the_a == EOF) {
+ error("Unterminated Regular Expression literal.");
}
- putc(theA, stdout);
+ putc(the_a, stdout);
}
- theB = next();
+ the_b = next();
}
}
}
Most spaces and linefeeds will be removed.
*/
-static void
-jsmin()
-{
- theA = '\n';
+static void jsmin() {
+ if (peek() == 0xEF) {
+ get();
+ get();
+ get();
+ }
+ the_a = '\n';
action(3);
- while (theA != EOF) {
- switch (theA) {
+ while (the_a != EOF) {
+ switch (the_a) {
case ' ':
- if (isAlphanum(theB)) {
- action(1);
- } else {
- action(2);
- }
+ action(
+ is_alphanum(the_b)
+ ? 1
+ : 2
+ );
break;
case '\n':
- switch (theB) {
+ switch (the_b) {
case '{':
case '[':
case '(':
case '+':
case '-':
+ case '!':
+ case '~':
action(1);
break;
case ' ':
action(3);
break;
default:
- if (isAlphanum(theB)) {
- action(1);
- } else {
- action(2);
- }
+ action(
+ is_alphanum(the_b)
+ ? 1
+ : 2
+ );
}
break;
default:
- switch (theB) {
+ switch (the_b) {
case ' ':
- if (isAlphanum(theA)) {
- action(1);
- break;
- }
- action(3);
+ action(
+ is_alphanum(the_a)
+ ? 1
+ : 3
+ );
break;
case '\n':
- switch (theA) {
+ switch (the_a) {
case '}':
case ']':
case ')':
action(1);
break;
default:
- if (isAlphanum(theA)) {
- action(1);
- } else {
- action(3);
- }
+ action(
+ is_alphanum(the_a)
+ ? 1
+ : 3
+ );
}
break;
default:
/* main -- Output any command line arguments as comments
and then minify the input.
*/
-extern int
-main(int argc, char* argv[])
-{
+
+extern int main(int argc, char* argv[]) {
int i;
for (i = 1; i < argc; i += 1) {
fprintf(stdout, "// %s\n", argv[i]);
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