/* jsmin.c 2008-08-03Copyright (c) 2002 Douglas Crockford (www.crockford.com)Permission is hereby granted, free of charge, to any person obtaining a copy ofthis software and associated documentation files (the "Software"), to deal inthe Software without restriction, including without limitation the rights touse, copy, modify, merge, publish, distribute, sublicense, and/or sell copiesof the Software, and to permit persons to whom the Software is furnished to doso, subject to the following conditions:The above copyright notice and this permission notice shall be included in allcopies 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 ORIMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THEAUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHERLIABILITY, 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 THESOFTWARE.*/#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 intisAlphanum(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 intget(){ 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 intpeek(){ theLookahead = get(); return theLookahead;}/* next -- get the next character, excluding comments. peek() is used to see if a '/' is followed by a '/' or '*'.*/static intnext(){ 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 voidaction(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 == '\\') { putc(theA, stdout); theA = get(); } if (theA == EOF) { fprintf(stderr, "Error: JSMIN unterminated string literal."); 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; } if (theA =='\\') { putc(theA, stdout); theA = get(); } if (theA == EOF) { fprintf(stderr,"Error: JSMIN unterminated Regular Expression literal.\n"); 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 voidjsmin(){ 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 intmain(int argc, char* argv[]){ int i; for (i = 1; i < argc; i += 1) { fprintf(stdout, "// %s\n", argv[i]); } jsmin(); return 0;}