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+/* jsmin.c
+ 2019-10-30
+
+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.
+*/
+
+/*
+This file was modified by Anton Šijanec in 2020 in order to allow it being
+used as a library for minifying JS inside other programs. All I've added
+is the option to read from a source file and output to the minified file.
+*/
+
+#include <stdlib.h>
+#include <stdio.h>
+
+static int the_a;
+static int the_b;
+static int look_ahead = EOF;
+static int the_x = EOF;
+static int the_y = EOF;
+FILE * source_js_file;
+FILE * minified_js_file;
+
+static void error(char* string) {
+ fputs("JSMIN Error: ", stderr);
+ fputs(string, stderr);
+ fputc('\n', stderr);
+ exit(1);
+}
+
+/* is_alphanum -- return true if the character is a letter, digit, underscore,
+ dollar sign, or non-ASCII character.
+*/
+
+static int is_alphanum(int codeunit) {
+ return (
+ (codeunit >= 'a' && codeunit <= 'z')
+ || (codeunit >= '0' && codeunit <= '9')
+ || (codeunit >= 'A' && codeunit <= 'Z')
+ || codeunit == '_'
+ || codeunit == '$'
+ || codeunit == '\\'
+ || codeunit > 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 codeunit = look_ahead;
+ look_ahead = EOF;
+ if (codeunit == EOF) {
+ codeunit = getc(source_js_file);
+ }
+ if (codeunit >= ' ' || codeunit == '\n' || codeunit == EOF) {
+ return codeunit;
+ }
+ if (codeunit == '\r') {
+ return '\n';
+ }
+ return ' ';
+}
+
+
+/* peek -- get the next character without advancing.
+*/
+
+static int peek() {
+ look_ahead = get();
+ return look_ahead;
+}
+
+
+/* next -- get the next character, excluding comments. peek() is used to see
+ if a '/' is followed by a '/' or '*'.
+*/
+
+static int next() {
+ int codeunit = get();
+ if (codeunit == '/') {
+ switch (peek()) {
+ case '/':
+ for (;;) {
+ codeunit = get();
+ if (codeunit <= '\n') {
+ break;
+ }
+ }
+ break;
+ case '*':
+ get();
+ while (codeunit != ' ') {
+ switch (get()) {
+ case '*':
+ if (peek() == '/') {
+ get();
+ codeunit = ' ';
+ }
+ break;
+ case EOF:
+ error("Unterminated comment.");
+ }
+ }
+ break;
+ }
+ }
+ the_y = the_x;
+ the_x = codeunit;
+ return codeunit;
+}
+
+
+/* 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.
+ action recognizes a regular expression if it is preceded by the likes of
+ '(' or ',' or '='.
+*/
+
+static void action(int determined) {
+ switch (determined) {
+ case 1:
+ putc(the_a, minified_js_file);
+ if (
+ (the_y == '\n' || the_y == ' ')
+ && (the_a == '+' || the_a == '-' || the_a == '*' || the_a == '/')
+ && (the_b == '+' || the_b == '-' || the_b == '*' || the_b == '/')
+ ) {
+ putc(the_y, minified_js_file);
+ }
+ case 2:
+ the_a = the_b;
+ if (the_a == '\'' || the_a == '"' || the_a == '`') {
+ for (;;) {
+ putc(the_a, minified_js_file);
+ the_a = get();
+ if (the_a == the_b) {
+ break;
+ }
+ if (the_a == '\\') {
+ putc(the_a, minified_js_file);
+ the_a = get();
+ }
+ if (the_a == EOF) {
+ error("Unterminated string literal.");
+ }
+ }
+ }
+ case 3:
+ the_b = next();
+ if (the_b == '/' && (
+ the_a == '(' || the_a == ',' || the_a == '=' || the_a == ':'
+ || the_a == '[' || the_a == '!' || the_a == '&' || the_a == '|'
+ || the_a == '?' || the_a == '+' || the_a == '-' || the_a == '~'
+ || the_a == '*' || the_a == '/' || the_a == '{' || the_a == '}'
+ || the_a == ';'
+ )) {
+ putc(the_a, minified_js_file);
+ if (the_a == '/' || the_a == '*') {
+ putc(' ', minified_js_file);
+ }
+ putc(the_b, minified_js_file);
+ for (;;) {
+ the_a = get();
+ if (the_a == '[') {
+ for (;;) {
+ putc(the_a, minified_js_file);
+ the_a = get();
+ if (the_a == ']') {
+ break;
+ }
+ if (the_a == '\\') {
+ putc(the_a, minified_js_file);
+ the_a = get();
+ }
+ if (the_a == EOF) {
+ error(
+ "Unterminated set in Regular Expression literal."
+ );
+ }
+ }
+ } else if (the_a == '/') {
+ switch (peek()) {
+ case '/':
+ case '*':
+ error(
+ "Unterminated set in Regular Expression literal."
+ );
+ }
+ break;
+ } else if (the_a =='\\') {
+ putc(the_a, minified_js_file);
+ the_a = get();
+ }
+ if (the_a == EOF) {
+ error("Unterminated Regular Expression literal.");
+ }
+ putc(the_a, minified_js_file);
+ }
+ the_b = 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() {
+ if (peek() == 0xEF) {
+ get();
+ get();
+ get();
+ }
+ the_a = '\n';
+ action(3);
+ while (the_a != EOF) {
+ switch (the_a) {
+ case ' ':
+ action(
+ is_alphanum(the_b)
+ ? 1
+ : 2
+ );
+ break;
+ case '\n':
+ switch (the_b) {
+ case '{':
+ case '[':
+ case '(':
+ case '+':
+ case '-':
+ case '!':
+ case '~':
+ action(1);
+ break;
+ case ' ':
+ action(3);
+ break;
+ default:
+ action(
+ is_alphanum(the_b)
+ ? 1
+ : 2
+ );
+ }
+ break;
+ default:
+ switch (the_b) {
+ case ' ':
+ action(
+ is_alphanum(the_a)
+ ? 1
+ : 3
+ );
+ break;
+ case '\n':
+ switch (the_a) {
+ case '}':
+ case ']':
+ case ')':
+ case '+':
+ case '-':
+ case '"':
+ case '\'':
+ case '`':
+ action(1);
+ break;
+ default:
+ action(
+ is_alphanum(the_a)
+ ? 1
+ : 3
+ );
+ }
+ break;
+ default:
+ action(1);
+ break;
+ }
+ }
+ }
+}
+
+
+/* minify_js -- input filename, output filename
+*/
+
+int minify_js(const char* source_js_filename, const char* minified_js_filename) {
+ minified_js_file = fopen(minified_js_filename, "w");
+ source_js_file = fopen(source_js_filename, "r");
+ jsmin();
+ return 0;
+}
+
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