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Copy pathtext.js
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114 lines (106 loc) · 3.1 KB
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/**
* @fileoverview Text utility.
* @license Apache-2.0
*/
import * as Diff from "diff";
import { stdoutColors } from "./terminal.js";
export function utf8Length(string) {
var len = 0;
for (var i = 0, k = string.length; i < k; ++i) {
let c = string.charCodeAt(i);
if (c < 128) {
len += 1;
} else if (c < 2048) {
len += 2;
} else if ((c & 0xFC00) === 0xD800 && i + 1 < k && (string.charCodeAt(i + 1) & 0xFC00) === 0xDC00) {
++i;
len += 4;
} else {
len += 3;
}
}
return len;
}
export function utf8Read(buffer, start, end) {
var len = end - start;
if (len < 1) return "";
var parts = null,
chunk = [],
i = 0, // char offset
t; // temporary
while (start < end) {
t = buffer[start++];
if (t < 128) {
chunk[i++] = t;
} else if (t > 191 && t < 224) {
chunk[i++] = (t & 31) << 6 | buffer[start++] & 63;
} else if (t > 239 && t < 365) {
t = ((t & 7) << 18 | (buffer[start++] & 63) << 12 | (buffer[start++] & 63) << 6 | buffer[start++] & 63) - 0x10000;
chunk[i++] = 0xD800 + (t >> 10);
chunk[i++] = 0xDC00 + (t & 1023);
} else {
chunk[i++] = (t & 15) << 12 | (buffer[start++] & 63) << 6 | buffer[start++] & 63;
}
if (i >= 8192) {
(parts || (parts = [])).push(String.fromCharCode(...chunk));
i = 0;
}
}
if (parts) {
if (i) parts.push(String.fromCharCode(...chunk.slice(0, i)));
return parts.join("");
}
return String.fromCharCode(...chunk.slice(0, i));
}
export function utf8Write(string, buffer, offset) {
var start = offset;
for (var i = 0, k = string.length; i < k; ++i) {
let c1 = string.charCodeAt(i), c2;
if (c1 < 128) {
buffer[offset++] = c1;
} else if (c1 < 2048) {
buffer[offset++] = c1 >> 6 | 192;
buffer[offset++] = c1 & 63 | 128;
} else if ((c1 & 0xFC00) === 0xD800 && i + 1 < k && ((c2 = string.charCodeAt(i + 1)) & 0xFC00) === 0xDC00) {
c1 = 0x10000 + ((c1 & 0x03FF) << 10) + (c2 & 0x03FF);
++i;
buffer[offset++] = c1 >> 18 | 240;
buffer[offset++] = c1 >> 12 & 63 | 128;
buffer[offset++] = c1 >> 6 & 63 | 128;
buffer[offset++] = c1 & 63 | 128;
} else {
buffer[offset++] = c1 >> 12 | 224;
buffer[offset++] = c1 >> 6 & 63 | 128;
buffer[offset++] = c1 & 63 | 128;
}
}
return offset - start;
}
export const utf8 = {
length: utf8Length,
read: utf8Read,
write: utf8Write
};
export function diff(filename, expected, actual) {
const diff = Diff.structuredPatch(filename, filename, expected, actual, "expected", "actual", { context: 5 });
if (!diff.hunks.length) return null;
const out = [
'--- ' + diff.oldHeader,
'+++ ' + diff.newHeader
];
for (const hunk of diff.hunks) {
out.push(
'@@ -' + hunk.oldStart + ',' + hunk.oldLines
+ ' +' + hunk.newStart + ',' + hunk.newLines
+ ' @@'
);
out.push(...hunk.lines.map(line =>
line.charAt(0) === "+"
? stdoutColors.green(line)
: line.charAt(0) === "-"
? line = stdoutColors.red(line)
: line
));
}
return out.join('\n') + '\n';
}