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regex-colorizer.js
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class RegexColorizer {
static coloringAll (class_name = "regex") {
for (let node of document.getElementsByClassName(class_name)) {
var regex = node.innerText;
var output = "";
var in_set = false;
var in_group = 0;
var has_group = 0;
for (let i = 0; i < regex.length; i++) {
var i_content = "";
var i_type = "";
var i_prefix = null;
var i_suffix = null;
var i_content = regex[i];
switch (regex[i]) {
case "^":
case "$":
i_type = "reg-anchor";
break;
case "?":
case "+":
case "*":
i_type = "reg-quantifier";
break;
case "\\":
i++; i_content += regex[i];
if ("dDsSvwW".includes(regex[i])) {
i_type = "reg-cclass";
} else if ("bB".includes(regex[i])) {
i_type = "reg-anchor";
} else if (regex[i] == "u") {
if (
"0123456789abcdef".includes(regex[i+1]) &&
"0123456789abcdef".includes(regex[i+2]) &&
"0123456789abcdef".includes(regex[i+3]) &&
"0123456789abcdef".includes(regex[i+4])
) {
i_content += regex[i+1] + regex[i+2] + regex[i+3] + regex[i+4];
i+=4;
}
i_type = "reg-cescape";
} else if (regex[i] == "x") {
if ("0123456789abcdef".includes(regex[i+1])) {
i++; i_content += regex[i];
if ("0123456789abcdef".includes(regex[i+1])) {
i++; i_content += regex[i];
}
}
i_type = "reg-cescape";
} else if ("0123456789".includes(regex[i])) {
if (
"01234567".includes(regex[i]) &&
"01234567".includes(regex[i+1]) &&
"01234567".includes(regex[i+2])
) {
i_content += regex[i+1] + regex[i+2];
i+=2;
i_type = "reg-cescape";
} else {
var ref = regex[i];
if ("0123456789".includes(regex[i+1])) {
i++;
ref += regex[i];
i_content += regex[i];
}
if (ref <= has_group) {
i_type = "reg-ref";
} else if (ref.length == 1 || (
"01234567".includes(ref[0]) &&
"01234567".includes(ref[1])
)) {
i_type = "reg-cescape";
} else {
i_type = "reg-ref reg-error";
}
}
} else {
i_type = "reg-cescape";
}
break;
case "(":
i_type = "reg-group-tag";
i_prefix = "reg-group";
if (regex[i+1] == "?") {
if (":=!".includes(regex[i+2])) {
i_content += regex[i+1];
i_content += regex[i+2];
i+=2;
} else if ("<"==regex[i+2] && "=!".includes(regex[i+3])) {
i_content += regex[i+1];
i_content += regex[i+2];
i_content += regex[i+3];
i+=3;
}
} else {
has_group++;
}
in_group++;
break;
case ")":
if (in_group > 0) {
i_type = "reg-group-tag";
i_suffix = "reg-group";
in_group--;
} else {
i_type = "reg-char reg-error";
}
break;
case "[":
if (in_set) {
i_type = "reg-char";
} else {
i_type = "reg-set-tag";
i_prefix = "reg-set";
if (regex[i+1] == "^") {
i_content = regex[i+1];
i++;
}
in_set = true;
}
break;
case "]":
if (in_set) {
i_type = "reg-set-tag";
i_suffix = "reg-set";
} else {
i_type = "reg-char";
}
break;
case "-":
if (in_set && !(regex[i+1]=="]")) {
i_type = "reg-set-tag";
} else {
i_type = "reg-char";
}
break;
case "{":
var vaild = true;
var closed = false;
var has_sepetar = false;
var this_counter = regex[i];
var c = 0;
for (c=1; !closed && vaild && i+c < regex.length; c++) {
this_counter += regex[i+c];
if ("0123456789".includes(regex[i+c])) {
} else if (regex[i+c] == ",") {
if (c == 1 || has_sepetar) vaild = false;
has_sepetar = true;
} else if (regex[i+c] == "}") {
if (c == 1) vaild = false;
closed = true;
} else {
vaild = false;
}
}
if (vaild) {
i_content = this_counter;
i_type = "reg-quantifier";
i += c-1;
} else {
i_type = "reg-char";
}
break;
default:
i_type = "reg-char";
}
if (i_prefix != null) output += `<span class='${i_prefix}'>`;
output += `<span class='${i_type}'>${i_content}</span>`;
if (i_suffix != null) output += `</span>`;
}
node.innerHTML = output;
}
}
}