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precomputed codes, fastpath for no-lf/no-escape strings

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This commit is contained in:
Yanis Benson 2019-03-27 08:24:03 +03:00
parent fb5da89bcb
commit 200373790f
1 changed files with 29 additions and 19 deletions
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48
index.js
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@ -30,12 +30,7 @@ const stringReplaceAll = (str, substr, replacer) => {
return res;
};
const stringEncaseCRLF = (str, prefix, postfix) => {
let idx = str.indexOf('\n');
if (idx === -1) {
return str;
}
const stringEncaseCRLFWithFirstIndex = (str, prefix, postfix, idx) => {
let end = 0;
let res = '';
do {
@ -163,9 +158,21 @@ const proto = Object.defineProperties(() => {}, {
});
const createStyler = (open, close, parent) => {
let openAll;
let closeAll;
if (parent === undefined) {
openAll = open;
closeAll = close;
} else {
openAll = parent.openAll + open;
closeAll = close + parent.closeAll;
}
return {
open,
close,
openAll,
closeAll,
parent
};
};
@ -194,29 +201,32 @@ const applyStyle = (self, string) => {
let styler = self._styler;
if (styler !== undefined) {
let closeAll = '';
let openAll = '';
if (styler === undefined) {
return string;
}
const {openAll, closeAll} = styler;
if (string.indexOf('\u001B') !== -1) {
while (styler !== undefined) {
// Replace any instances already present with a re-opening code
// otherwise only the part of the string until said closing code
// will be colored, and the rest will simply be 'plain'.
string = stringReplaceAll(string, styler.close, styler.open);
openAll = styler.open + openAll;
closeAll += styler.close;
styler = styler.parent;
}
// We can move both next actions out of loop, because remaining actions in loop won't have any/visible effect on parts we add here
// Close the styling before a linebreak and reopen
// after next line to fix a bleed issue on macOS
// https://github.com/chalk/chalk/pull/92
string = stringEncaseCRLF(string, closeAll, openAll);
string = openAll + string + closeAll;
}
return string;
// We can move both next actions out of loop, because remaining actions in loop won't have any/visible effect on parts we add here
// Close the styling before a linebreak and reopen
// after next line to fix a bleed issue on macOS
// https://github.com/chalk/chalk/pull/92
const lfIdx = string.indexOf('\n');
if (lfIdx !== -1) {
string = stringEncaseCRLFWithFirstIndex(string, closeAll, openAll, lfIdx);
}
return openAll + string + closeAll;
};
const chalkTag = (chalk, ...strings) => {