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Complete rewrite without RegExp #72

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Complete rewrite without RegExp #72

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419e88c
Complete rewrite without RegExp
Virtual-X May 12, 2022
e7a1efa
Fix for jsons terminating with /
Virtual-X May 12, 2022
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119 changes: 72 additions & 47 deletions minify.json.js
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Original file line number Diff line number Diff line change
Expand Up @@ -10,64 +10,89 @@

global.JSON.minify = function JSON_minify(json) {

var tokenizer = /"|(\/\*)|(\*\/)|(\/\/)|\n|\r/g,
in_string = false,
var in_string = false,
in_multiline_comment = false,
in_singleline_comment = false,
tmp, tmp2, new_str = [], ns = 0, from = 0, lc, rc,
prevFrom
;
backslash = false,
len = json.length,
i = 0,
c,
new_str = [],
from = 0,
new_chars = 0,
add_chars = 0;

tokenizer.lastIndex = 0;

while (tmp = tokenizer.exec(json)) {
lc = RegExp.leftContext;
rc = RegExp.rightContext;
if (!in_multiline_comment && !in_singleline_comment) {
tmp2 = lc.substring(from);
if (!in_string) {
tmp2 = tmp2.replace(/(\n|\r|\s)+/g,"");
while (i < len) {
backslash = !backslash && c == "\\"
c = json[i++];
if (in_singleline_comment) {
if (c == "\r" || c == "\n") {
in_singleline_comment = false;
}
new_str[ns++] = tmp2;
}
prevFrom = from;
from = tokenizer.lastIndex;

// found a " character, and we're not currently in
// a comment? check for previous `\` escaping immediately
// leftward adjacent to this match
if (tmp[0] == "\"" && !in_multiline_comment && !in_singleline_comment) {
// perform look-behind escaping match, but
// limit left-context matching to only go back
// to the position of the last token match
//
// see: https://github.com/getify/JSON.minify/issues/64
tmp2 = lc.substring(prevFrom).match(/\\+$/);

// start of string with ", or unescaped " character found to end string?
if (!in_string || !tmp2 || (tmp2[0].length % 2) == 0) {
in_string = !in_string;
else if (in_multiline_comment) {
if (c == "*") {
if (i >= len) {
break;
}
c = json[i++];
if (c == "/") {
in_multiline_comment = false;
}
}
from--; // include " character in next catch
rc = json.substring(from);
}
else if (tmp[0] == "/*" && !in_string && !in_multiline_comment && !in_singleline_comment) {
in_multiline_comment = true;
}
else if (tmp[0] == "*/" && !in_string && in_multiline_comment && !in_singleline_comment) {
in_multiline_comment = false;
}
else if (tmp[0] == "//" && !in_string && !in_multiline_comment && !in_singleline_comment) {
in_singleline_comment = true;
else {
if (c == "\"" && !backslash) {
in_string = !in_string;
add_chars = 1;
}
else if (in_string) {
if (c != "\n" && c != "\r") {
add_chars = 1;
}
}
else {
if (c == "/") {
if (i >= len) {
add_chars = 1;
if (new_chars == 0) {
from = i - add_chars;
}
new_chars += add_chars;
break;
}
backslash = !backslash && c == "\\"
c = json[i++];
if (c == "/") {
in_singleline_comment = true;
}
else if (c == "*") {
in_multiline_comment = true;
}
else {
add_chars = 2;
}
}
else if (c !== " " && c !== "\t" && c !== "\n" && c !== "\r") {
add_chars = 1;
}
}
}
else if ((tmp[0] == "\n" || tmp[0] == "\r") && !in_string && !in_multiline_comment && in_singleline_comment) {
in_singleline_comment = false;
if (add_chars > 0) {
if (new_chars == 0) {
from = i - add_chars;
}
new_chars += add_chars;
add_chars = 0;
}
else if (!in_multiline_comment && !in_singleline_comment && !(/\n|\r|\s/.test(tmp[0]))) {
new_str[ns++] = tmp[0];
else if (new_chars > 0) {
new_str.push(json.substring(from, from + new_chars));
new_chars = 0;
}
}
new_str[ns++] = rc;
if (new_chars > 0) {
new_str.push(json.substring(from, from + new_chars));
}
return new_str.join("");
};
})(
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