| /* jsmin.c |
| 2011-01-22 |
| |
| 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 == '\\') { |
| 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 == '[') { |
| for (;;) { |
| putc(theA, stdout); |
| theA = get(); |
| if (theA == ']') { |
| break; |
| } |
| if (theA == '\\') { |
| putc(theA, stdout); |
| theA = get(); |
| } |
| if (theA == EOF) { |
| fprintf(stderr, |
| "Error: JSMIN unterminated set in Regular Expression literal.\n"); |
| exit(1); |
| } |
| } |
| } else if (theA == '/') { |
| break; |
| } else 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 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; |
| } |