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+/* jsmin.c
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+ 2011-09-30
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+
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+Copyright (c) 2002 Douglas Crockford (www.crockford.com)
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+
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+Permission is hereby granted, free of charge, to any person obtaining a copy of
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+this software and associated documentation files (the "Software"), to deal in
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+the Software without restriction, including without limitation the rights to
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+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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+of the Software, and to permit persons to whom the Software is furnished to do
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+so, subject to the following conditions:
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+
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+The above copyright notice and this permission notice shall be included in all
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+copies or substantial portions of the Software.
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+
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+The Software shall be used for Good, not Evil.
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+
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+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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+SOFTWARE.
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+*/
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+
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+#include <stdlib.h>
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+#include <stdio.h>
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+
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+static int theA;
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+static int theB;
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+static int theLookahead = EOF;
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+
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+
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+/* isAlphanum -- return true if the character is a letter, digit, underscore,
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+ dollar sign, or non-ASCII character.
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+*/
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+
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+static int
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+isAlphanum(int c)
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+{
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+ return ((c >= 'a' && c <= 'z') || (c >= '0' && c <= '9') ||
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+ (c >= 'A' && c <= 'Z') || c == '_' || c == '$' || c == '\\' ||
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+ c > 126);
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+}
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+
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+
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+/* get -- return the next character from stdin. Watch out for lookahead. If
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+ the character is a control character, translate it to a space or
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+ linefeed.
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+*/
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+
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+static int
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+get()
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+{
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+ int c = theLookahead;
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+ theLookahead = EOF;
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+ if (c == EOF) {
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+ c = getc(stdin);
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+ }
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+ if (c >= ' ' || c == '\n' || c == EOF) {
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+ return c;
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+ }
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+ if (c == '\r') {
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+ return '\n';
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+ }
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+ return ' ';
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+}
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+
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+
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+/* peek -- get the next character without getting it.
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+*/
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+
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+static int
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+peek()
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+{
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+ theLookahead = get();
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+ return theLookahead;
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+}
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+
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+
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+/* next -- get the next character, excluding comments. peek() is used to see
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+ if a '/' is followed by a '/' or '*'.
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+*/
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+
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+static int
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+next()
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+{
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+ int c = get();
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+ if (c == '/') {
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+ switch (peek()) {
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+ case '/':
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+ for (;;) {
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+ c = get();
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+ if (c <= '\n') {
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+ return c;
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+ }
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+ }
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+ case '*':
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+ get();
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+ for (;;) {
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+ switch (get()) {
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+ case '*':
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+ if (peek() == '/') {
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+ get();
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+ return ' ';
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+ }
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+ break;
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+ case EOF:
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+ fprintf(stderr, "Error: JSMIN Unterminated comment.\n");
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+ exit(1);
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+ }
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+ }
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+ default:
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+ return c;
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+ }
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+ }
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+ return c;
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+}
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+
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+
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+/* action -- do something! What you do is determined by the argument:
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+ 1 Output A. Copy B to A. Get the next B.
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+ 2 Copy B to A. Get the next B. (Delete A).
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+ 3 Get the next B. (Delete B).
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+ action treats a string as a single character. Wow!
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+ action recognizes a regular expression if it is preceded by ( or , or =.
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+*/
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+
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+static void
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+action(int d)
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+{
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+ switch (d) {
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+ case 1:
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+ putc(theA, stdout);
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+ case 2:
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+ theA = theB;
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+ if (theA == '\'' || theA == '"' || theA == '`') {
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+ for (;;) {
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+ putc(theA, stdout);
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+ theA = get();
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+ if (theA == theB) {
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+ break;
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+ }
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+ if (theA == '\\') {
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+ putc(theA, stdout);
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+ theA = get();
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+ }
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+ if (theA == EOF) {
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+ fprintf(stderr, "Error: JSMIN unterminated string literal.");
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+ exit(1);
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+ }
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+ }
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+ }
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+ case 3:
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+ theB = next();
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+ if (theB == '/' && (theA == '(' || theA == ',' || theA == '=' ||
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+ theA == ':' || theA == '[' || theA == '!' ||
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+ theA == '&' || theA == '|' || theA == '?' ||
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+ theA == '{' || theA == '}' || theA == ';' ||
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+ theA == '\n')) {
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+ putc(theA, stdout);
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+ putc(theB, stdout);
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+ for (;;) {
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+ theA = get();
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+ if (theA == '[') {
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+ for (;;) {
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+ putc(theA, stdout);
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+ theA = get();
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+ if (theA == ']') {
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+ break;
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+ }
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+ if (theA == '\\') {
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+ putc(theA, stdout);
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+ theA = get();
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+ }
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+ if (theA == EOF) {
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+ fprintf(stderr,
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+ "Error: JSMIN unterminated set in Regular Expression literal.\n");
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+ exit(1);
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+ }
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+ }
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+ } else if (theA == '/') {
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+ break;
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+ } else if (theA =='\\') {
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+ putc(theA, stdout);
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+ theA = get();
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+ }
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+ if (theA == EOF) {
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+ fprintf(stderr,
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+ "Error: JSMIN unterminated Regular Expression literal.\n");
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+ exit(1);
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+ }
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+ putc(theA, stdout);
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+ }
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+ theB = next();
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+ }
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+ }
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+}
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+
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+
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+/* jsmin -- Copy the input to the output, deleting the characters which are
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+ insignificant to JavaScript. Comments will be removed. Tabs will be
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+ replaced with spaces. Carriage returns will be replaced with linefeeds.
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+ Most spaces and linefeeds will be removed.
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+*/
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+
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+static void
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+jsmin()
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+{
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+ theA = '\n';
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+ action(3);
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+ while (theA != EOF) {
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+ switch (theA) {
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+ case ' ':
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+ if (isAlphanum(theB)) {
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+ action(1);
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+ } else {
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+ action(2);
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+ }
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+ break;
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+ case '\n':
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+ switch (theB) {
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+ case '{':
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+ case '[':
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+ case '(':
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+ case '+':
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+ case '-':
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+ action(1);
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+ break;
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+ case ' ':
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+ action(3);
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+ break;
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+ default:
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+ if (isAlphanum(theB)) {
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+ action(1);
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+ } else {
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+ action(2);
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+ }
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+ }
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+ break;
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+ default:
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+ switch (theB) {
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+ case ' ':
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+ if (isAlphanum(theA)) {
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+ action(1);
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+ break;
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+ }
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+ action(3);
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+ break;
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+ case '\n':
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+ switch (theA) {
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+ case '}':
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+ case ']':
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+ case ')':
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+ case '+':
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+ case '-':
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+ case '"':
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+ case '\'':
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+ case '`':
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+ action(1);
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+ break;
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+ default:
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+ if (isAlphanum(theA)) {
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+ action(1);
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+ } else {
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+ action(3);
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+ }
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+ }
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+ break;
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+ default:
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+ action(1);
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+ break;
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+ }
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+ }
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+ }
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+}
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+
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+
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+/* main -- Output any command line arguments as comments
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+ and then minify the input.
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+*/
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+extern int
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+main(int argc, char* argv[])
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+{
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+ int i;
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+ for (i = 1; i < argc; i += 1) {
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+ fprintf(stdout, "// %s\n", argv[i]);
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+ }
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+ jsmin();
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+ return 0;
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+}
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