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var url = require('url');
var path = require('path');
// Is the url an external url
function isExternal(href) {
try {
return Boolean(url.parse(href).protocol) && !isDataURI(href);
} catch(err) {
return false;
}
}
// Is the url an iniline data-uri
function isDataURI(href) {
try {
return Boolean(url.parse(href).protocol) && (url.parse(href).protocol === 'data:');
} catch(err) {
return false;
}
}
// Inverse of isExternal
function isRelative(href) {
return !isExternal(href);
}
// Return true if the link is an achor
function isAnchor(href) {
try {
var parsed = url.parse(href);
return !!(!parsed.protocol && !parsed.path && parsed.hash);
} catch(err) {
return false;
}
}
// Normalize a path to be a link
function normalize(s) {
return path.normalize(s).replace(/\\/g, '/');
}
/**
* Flatten a path, it removes the leading "/"
*
* @param {String} href
* @return {String}
*/
function flatten(href) {
href = normalize(href);
if (href[0] == '/') {
href = normalize(href.slice(1));
}
return href;
}
/**
* Convert a relative path to absolute
*
* @param {String} href
* @param {String} dir: directory parent of the file currently in rendering process
* @param {String} outdir: directory parent from the html output
* @return {String}
*/
function toAbsolute(_href, dir, outdir) {
if (isExternal(_href) || isDataURI(_href)) {
return _href;
}
outdir = outdir == undefined? dir : outdir;
_href = normalize(_href);
dir = normalize(dir);
outdir = normalize(outdir);
// Path "_href" inside the base folder
var hrefInRoot = normalize(path.join(dir, _href));
if (_href[0] == '/') {
hrefInRoot = normalize(_href.slice(1));
}
// Make it relative to output
_href = path.relative(outdir, hrefInRoot);
// Normalize windows paths
_href = normalize(_href);
return _href;
}
/**
* Convert an absolute path to a relative path for a specific folder (dir)
* ('test/', 'hello.md') -> '../hello.md'
*
* @param {String} dir: current directory
* @param {String} file: absolute path of file
* @return {String}
*/
function relative(dir, file) {
var isDirectory = file.slice(-1) === '/';
return normalize(path.relative(dir, file)) + (isDirectory? '/': '');
}
/**
* Convert an absolute path to a relative path for a specific folder (dir)
* ('test/test.md', 'hello.md') -> '../hello.md'
*
* @param {String} baseFile: current file
* @param {String} file: absolute path of file
* @return {String}
*/
function relativeForFile(baseFile, file) {
return relative(path.dirname(baseFile), file);
}
/**
* Compare two paths, return true if they are identical
* ('README.md', './README.md') -> true
*
* @param {String} p1: first path
* @param {String} p2: second path
* @return {Boolean}
*/
function areIdenticalPaths(p1, p2) {
return normalize(p1) === normalize(p2);
}
module.exports = {
areIdenticalPaths: areIdenticalPaths,
isDataURI: isDataURI,
isExternal: isExternal,
isRelative: isRelative,
isAnchor: isAnchor,
normalize: normalize,
toAbsolute: toAbsolute,
relative: relative,
relativeForFile: relativeForFile,
flatten: flatten
};
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