1 files changed, 324 insertions, 0 deletions

diff --git a/lib/jsmin.c b/lib/jsmin.c
new file mode 100644
index 0000000..f63e68f
--- /dev/null
+++ b/lib/jsmin.c
@@ -0,0 +1,324 @@
+/* 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;
+}
+