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/* jsmin.c
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2006-05-04
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Copyright (c) 2002 Douglas Crockford (www.crockford.com)
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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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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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The Software shall be used for Good, not Evil.
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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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#include <stdlib.h>
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#include <stdio.h>
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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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/* 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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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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/* 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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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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/* peek -- get the next character without getting it.
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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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/* 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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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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/* 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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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 == '"') {
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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 <= '\n') {
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fprintf(stderr,
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"Error: JSMIN unterminated string literal: %c\n", theA);
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exit(1);
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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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}
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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 == '!' || theA == '&' ||
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theA == '|')) {
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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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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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} else if (theA <= '\n') {
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fprintf(stderr,
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"Error: JSMIN unterminated Regular Expression literal.\n", theA);
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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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/* 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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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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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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/* 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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