1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 | /* 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; } |