| /* jsmin.c | |
| 2006-05-04 | |
| 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 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 int | |
| isAlphanum(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 int | |
| get() | |
| { | |
| 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 int | |
| peek() | |
| { | |
| theLookahead = get(); | |
| return theLookahead; | |
| } | |
| /* next -- get the next character, excluding comments. peek() is used to see | |
| if a '/' is followed by a '/' or '*'. | |
| */ | |
| static int | |
| next() | |
| { | |
| 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 void | |
| action(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 <= '\n') { | |
| fprintf(stderr, | |
| "Error: JSMIN unterminated string literal: %c\n", theA); | |
| exit(1); | |
| } | |
| if (theA == '\\') { | |
| putc(theA, stdout); | |
| theA = get(); | |
| } | |
| } | |
| } | |
| case 3: | |
| theB = next(); | |
| if (theB == '/' && (theA == '(' || theA == ',' || theA == '=' || | |
| theA == ':' || theA == '[' || theA == '!' || theA == '&' || | |
| theA == '|')) { | |
| putc(theA, stdout); | |
| putc(theB, stdout); | |
| for (;;) { | |
| theA = get(); | |
| if (theA == '/') { | |
| break; | |
| } else if (theA =='\\') { | |
| putc(theA, stdout); | |
| theA = get(); | |
| } else if (theA <= '\n') { | |
| fprintf(stderr, | |
| "Error: JSMIN unterminated Regular Expression literal.\n", theA); | |
| 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 void | |
| jsmin() | |
| { | |
| 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 int | |
| main(int argc, char* argv[]) | |
| { | |
| int i; | |
| for (i = 1; i < argc; i += 1) { | |
| fprintf(stdout, "// %s\n", argv[i]); | |
| } | |
| jsmin(); | |
| return 0; | |
| } | |