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denoland-deno/std/path/posix.ts
2020-10-19 14:36:53 +02:00

455 lines
13 KiB
TypeScript

// Copyright the Browserify authors. MIT License.
// Ported from https://github.com/browserify/path-browserify/
/** This module is browser compatible. */
import type { FormatInputPathObject, ParsedPath } from "./_interface.ts";
import { CHAR_DOT, CHAR_FORWARD_SLASH } from "./_constants.ts";
import {
_format,
assertPath,
isPosixPathSeparator,
normalizeString,
} from "./_util.ts";
export const sep = "/";
export const delimiter = ":";
// path.resolve([from ...], to)
export function resolve(...pathSegments: string[]): string {
let resolvedPath = "";
let resolvedAbsolute = false;
for (let i = pathSegments.length - 1; i >= -1 && !resolvedAbsolute; i--) {
let path: string;
if (i >= 0) path = pathSegments[i];
else {
if (globalThis.Deno == null) {
throw new TypeError("Resolved a relative path without a CWD.");
}
path = Deno.cwd();
}
assertPath(path);
// Skip empty entries
if (path.length === 0) {
continue;
}
resolvedPath = `${path}/${resolvedPath}`;
resolvedAbsolute = path.charCodeAt(0) === CHAR_FORWARD_SLASH;
}
// At this point the path should be resolved to a full absolute path, but
// handle relative paths to be safe (might happen when process.cwd() fails)
// Normalize the path
resolvedPath = normalizeString(
resolvedPath,
!resolvedAbsolute,
"/",
isPosixPathSeparator,
);
if (resolvedAbsolute) {
if (resolvedPath.length > 0) return `/${resolvedPath}`;
else return "/";
} else if (resolvedPath.length > 0) return resolvedPath;
else return ".";
}
export function normalize(path: string): string {
assertPath(path);
if (path.length === 0) return ".";
const isAbsolute = path.charCodeAt(0) === CHAR_FORWARD_SLASH;
const trailingSeparator =
path.charCodeAt(path.length - 1) === CHAR_FORWARD_SLASH;
// Normalize the path
path = normalizeString(path, !isAbsolute, "/", isPosixPathSeparator);
if (path.length === 0 && !isAbsolute) path = ".";
if (path.length > 0 && trailingSeparator) path += "/";
if (isAbsolute) return `/${path}`;
return path;
}
export function isAbsolute(path: string): boolean {
assertPath(path);
return path.length > 0 && path.charCodeAt(0) === CHAR_FORWARD_SLASH;
}
export function join(...paths: string[]): string {
if (paths.length === 0) return ".";
let joined: string | undefined;
for (let i = 0, len = paths.length; i < len; ++i) {
const path = paths[i];
assertPath(path);
if (path.length > 0) {
if (!joined) joined = path;
else joined += `/${path}`;
}
}
if (!joined) return ".";
return normalize(joined);
}
export function relative(from: string, to: string): string {
assertPath(from);
assertPath(to);
if (from === to) return "";
from = resolve(from);
to = resolve(to);
if (from === to) return "";
// Trim any leading backslashes
let fromStart = 1;
const fromEnd = from.length;
for (; fromStart < fromEnd; ++fromStart) {
if (from.charCodeAt(fromStart) !== CHAR_FORWARD_SLASH) break;
}
const fromLen = fromEnd - fromStart;
// Trim any leading backslashes
let toStart = 1;
const toEnd = to.length;
for (; toStart < toEnd; ++toStart) {
if (to.charCodeAt(toStart) !== CHAR_FORWARD_SLASH) break;
}
const toLen = toEnd - toStart;
// Compare paths to find the longest common path from root
const length = fromLen < toLen ? fromLen : toLen;
let lastCommonSep = -1;
let i = 0;
for (; i <= length; ++i) {
if (i === length) {
if (toLen > length) {
if (to.charCodeAt(toStart + i) === CHAR_FORWARD_SLASH) {
// We get here if `from` is the exact base path for `to`.
// For example: from='/foo/bar'; to='/foo/bar/baz'
return to.slice(toStart + i + 1);
} else if (i === 0) {
// We get here if `from` is the root
// For example: from='/'; to='/foo'
return to.slice(toStart + i);
}
} else if (fromLen > length) {
if (from.charCodeAt(fromStart + i) === CHAR_FORWARD_SLASH) {
// We get here if `to` is the exact base path for `from`.
// For example: from='/foo/bar/baz'; to='/foo/bar'
lastCommonSep = i;
} else if (i === 0) {
// We get here if `to` is the root.
// For example: from='/foo'; to='/'
lastCommonSep = 0;
}
}
break;
}
const fromCode = from.charCodeAt(fromStart + i);
const toCode = to.charCodeAt(toStart + i);
if (fromCode !== toCode) break;
else if (fromCode === CHAR_FORWARD_SLASH) lastCommonSep = i;
}
let out = "";
// Generate the relative path based on the path difference between `to`
// and `from`
for (i = fromStart + lastCommonSep + 1; i <= fromEnd; ++i) {
if (i === fromEnd || from.charCodeAt(i) === CHAR_FORWARD_SLASH) {
if (out.length === 0) out += "..";
else out += "/..";
}
}
// Lastly, append the rest of the destination (`to`) path that comes after
// the common path parts
if (out.length > 0) return out + to.slice(toStart + lastCommonSep);
else {
toStart += lastCommonSep;
if (to.charCodeAt(toStart) === CHAR_FORWARD_SLASH) ++toStart;
return to.slice(toStart);
}
}
export function toNamespacedPath(path: string): string {
// Non-op on posix systems
return path;
}
export function dirname(path: string): string {
assertPath(path);
if (path.length === 0) return ".";
const hasRoot = path.charCodeAt(0) === CHAR_FORWARD_SLASH;
let end = -1;
let matchedSlash = true;
for (let i = path.length - 1; i >= 1; --i) {
if (path.charCodeAt(i) === CHAR_FORWARD_SLASH) {
if (!matchedSlash) {
end = i;
break;
}
} else {
// We saw the first non-path separator
matchedSlash = false;
}
}
if (end === -1) return hasRoot ? "/" : ".";
if (hasRoot && end === 1) return "//";
return path.slice(0, end);
}
export function basename(path: string, ext = ""): string {
if (ext !== undefined && typeof ext !== "string") {
throw new TypeError('"ext" argument must be a string');
}
assertPath(path);
let start = 0;
let end = -1;
let matchedSlash = true;
let i: number;
if (ext !== undefined && ext.length > 0 && ext.length <= path.length) {
if (ext.length === path.length && ext === path) return "";
let extIdx = ext.length - 1;
let firstNonSlashEnd = -1;
for (i = path.length - 1; i >= 0; --i) {
const code = path.charCodeAt(i);
if (code === CHAR_FORWARD_SLASH) {
// If we reached a path separator that was not part of a set of path
// separators at the end of the string, stop now
if (!matchedSlash) {
start = i + 1;
break;
}
} else {
if (firstNonSlashEnd === -1) {
// We saw the first non-path separator, remember this index in case
// we need it if the extension ends up not matching
matchedSlash = false;
firstNonSlashEnd = i + 1;
}
if (extIdx >= 0) {
// Try to match the explicit extension
if (code === ext.charCodeAt(extIdx)) {
if (--extIdx === -1) {
// We matched the extension, so mark this as the end of our path
// component
end = i;
}
} else {
// Extension does not match, so our result is the entire path
// component
extIdx = -1;
end = firstNonSlashEnd;
}
}
}
}
if (start === end) end = firstNonSlashEnd;
else if (end === -1) end = path.length;
return path.slice(start, end);
} else {
for (i = path.length - 1; i >= 0; --i) {
if (path.charCodeAt(i) === CHAR_FORWARD_SLASH) {
// If we reached a path separator that was not part of a set of path
// separators at the end of the string, stop now
if (!matchedSlash) {
start = i + 1;
break;
}
} else if (end === -1) {
// We saw the first non-path separator, mark this as the end of our
// path component
matchedSlash = false;
end = i + 1;
}
}
if (end === -1) return "";
return path.slice(start, end);
}
}
export function extname(path: string): string {
assertPath(path);
let startDot = -1;
let startPart = 0;
let end = -1;
let matchedSlash = true;
// Track the state of characters (if any) we see before our first dot and
// after any path separator we find
let preDotState = 0;
for (let i = path.length - 1; i >= 0; --i) {
const code = path.charCodeAt(i);
if (code === CHAR_FORWARD_SLASH) {
// If we reached a path separator that was not part of a set of path
// separators at the end of the string, stop now
if (!matchedSlash) {
startPart = i + 1;
break;
}
continue;
}
if (end === -1) {
// We saw the first non-path separator, mark this as the end of our
// extension
matchedSlash = false;
end = i + 1;
}
if (code === CHAR_DOT) {
// If this is our first dot, mark it as the start of our extension
if (startDot === -1) startDot = i;
else if (preDotState !== 1) preDotState = 1;
} else if (startDot !== -1) {
// We saw a non-dot and non-path separator before our dot, so we should
// have a good chance at having a non-empty extension
preDotState = -1;
}
}
if (
startDot === -1 ||
end === -1 ||
// We saw a non-dot character immediately before the dot
preDotState === 0 ||
// The (right-most) trimmed path component is exactly '..'
(preDotState === 1 && startDot === end - 1 && startDot === startPart + 1)
) {
return "";
}
return path.slice(startDot, end);
}
export function format(pathObject: FormatInputPathObject): string {
/* eslint-disable max-len */
if (pathObject === null || typeof pathObject !== "object") {
throw new TypeError(
`The "pathObject" argument must be of type Object. Received type ${typeof pathObject}`,
);
}
return _format("/", pathObject);
}
export function parse(path: string): ParsedPath {
assertPath(path);
const ret: ParsedPath = { root: "", dir: "", base: "", ext: "", name: "" };
if (path.length === 0) return ret;
const isAbsolute = path.charCodeAt(0) === CHAR_FORWARD_SLASH;
let start: number;
if (isAbsolute) {
ret.root = "/";
start = 1;
} else {
start = 0;
}
let startDot = -1;
let startPart = 0;
let end = -1;
let matchedSlash = true;
let i = path.length - 1;
// Track the state of characters (if any) we see before our first dot and
// after any path separator we find
let preDotState = 0;
// Get non-dir info
for (; i >= start; --i) {
const code = path.charCodeAt(i);
if (code === CHAR_FORWARD_SLASH) {
// If we reached a path separator that was not part of a set of path
// separators at the end of the string, stop now
if (!matchedSlash) {
startPart = i + 1;
break;
}
continue;
}
if (end === -1) {
// We saw the first non-path separator, mark this as the end of our
// extension
matchedSlash = false;
end = i + 1;
}
if (code === CHAR_DOT) {
// If this is our first dot, mark it as the start of our extension
if (startDot === -1) startDot = i;
else if (preDotState !== 1) preDotState = 1;
} else if (startDot !== -1) {
// We saw a non-dot and non-path separator before our dot, so we should
// have a good chance at having a non-empty extension
preDotState = -1;
}
}
if (
startDot === -1 ||
end === -1 ||
// We saw a non-dot character immediately before the dot
preDotState === 0 ||
// The (right-most) trimmed path component is exactly '..'
(preDotState === 1 && startDot === end - 1 && startDot === startPart + 1)
) {
if (end !== -1) {
if (startPart === 0 && isAbsolute) {
ret.base = ret.name = path.slice(1, end);
} else {
ret.base = ret.name = path.slice(startPart, end);
}
}
} else {
if (startPart === 0 && isAbsolute) {
ret.name = path.slice(1, startDot);
ret.base = path.slice(1, end);
} else {
ret.name = path.slice(startPart, startDot);
ret.base = path.slice(startPart, end);
}
ret.ext = path.slice(startDot, end);
}
if (startPart > 0) ret.dir = path.slice(0, startPart - 1);
else if (isAbsolute) ret.dir = "/";
return ret;
}
/** Converts a file URL to a path string.
*
* fromFileUrl("file:///home/foo"); // "/home/foo"
*/
export function fromFileUrl(url: string | URL): string {
url = url instanceof URL ? url : new URL(url);
if (url.protocol != "file:") {
throw new TypeError("Must be a file URL.");
}
return decodeURIComponent(
url.pathname.replace(/%(?![0-9A-Fa-f]{2})/g, "%25"),
);
}
/** Converts a path string to a file URL.
*
* toFileUrl("/home/foo"); // new URL("file:///home/foo")
*/
export function toFileUrl(path: string): URL {
if (!isAbsolute(path)) {
throw new TypeError("Must be an absolute path.");
}
const url = new URL("file:///");
url.pathname = path.replace(/%/g, "%25").replace(/\\/g, "%5C");
return url;
}