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463 lines
11 KiB
463 lines
11 KiB
// A simple implementation of make-array
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function make_array (subject) {
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return Array.isArray(subject)
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? subject
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: [subject]
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}
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const REGEX_BLANK_LINE = /^\s+$/
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const REGEX_LEADING_EXCAPED_EXCLAMATION = /^\\!/
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const REGEX_LEADING_EXCAPED_HASH = /^\\#/
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const SLASH = '/'
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const KEY_IGNORE = typeof Symbol !== 'undefined'
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? Symbol.for('node-ignore')
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/* istanbul ignore next */
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: 'node-ignore'
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const define = (object, key, value) =>
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Object.defineProperty(object, key, {value})
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const REGEX_REGEXP_RANGE = /([0-z])-([0-z])/g
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// Sanitize the range of a regular expression
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// The cases are complicated, see test cases for details
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const sanitizeRange = range => range.replace(
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REGEX_REGEXP_RANGE,
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(match, from, to) => from.charCodeAt(0) <= to.charCodeAt(0)
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? match
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// Invalid range (out of order) which is ok for gitignore rules but
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// fatal for JavaScript regular expression, so eliminate it.
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: ''
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)
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// > If the pattern ends with a slash,
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// > it is removed for the purpose of the following description,
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// > but it would only find a match with a directory.
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// > In other words, foo/ will match a directory foo and paths underneath it,
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// > but will not match a regular file or a symbolic link foo
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// > (this is consistent with the way how pathspec works in general in Git).
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// '`foo/`' will not match regular file '`foo`' or symbolic link '`foo`'
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// -> ignore-rules will not deal with it, because it costs extra `fs.stat` call
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// you could use option `mark: true` with `glob`
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// '`foo/`' should not continue with the '`..`'
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const DEFAULT_REPLACER_PREFIX = [
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// > Trailing spaces are ignored unless they are quoted with backslash ("\")
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[
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// (a\ ) -> (a )
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// (a ) -> (a)
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// (a \ ) -> (a )
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/\\?\s+$/,
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match => match.indexOf('\\') === 0
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? ' '
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: ''
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],
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// replace (\ ) with ' '
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[
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/\\\s/g,
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() => ' '
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],
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// Escape metacharacters
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// which is written down by users but means special for regular expressions.
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// > There are 12 characters with special meanings:
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// > - the backslash \,
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// > - the caret ^,
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// > - the dollar sign $,
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// > - the period or dot .,
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// > - the vertical bar or pipe symbol |,
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// > - the question mark ?,
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// > - the asterisk or star *,
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// > - the plus sign +,
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// > - the opening parenthesis (,
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// > - the closing parenthesis ),
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// > - and the opening square bracket [,
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// > - the opening curly brace {,
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// > These special characters are often called "metacharacters".
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[
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/[\\^$.|*+(){]/g,
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match => `\\${match}`
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],
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[
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// > [abc] matches any character inside the brackets
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// > (in this case a, b, or c);
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/\[([^\]/]*)($|\])/g,
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(match, p1, p2) => p2 === ']'
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? `[${sanitizeRange(p1)}]`
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: `\\${match}`
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],
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[
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// > a question mark (?) matches a single character
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/(?!\\)\?/g,
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() => '[^/]'
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],
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// leading slash
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[
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// > A leading slash matches the beginning of the pathname.
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// > For example, "/*.c" matches "cat-file.c" but not "mozilla-sha1/sha1.c".
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// A leading slash matches the beginning of the pathname
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/^\//,
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() => '^'
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],
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// replace special metacharacter slash after the leading slash
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[
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/\//g,
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() => '\\/'
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],
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[
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// > A leading "**" followed by a slash means match in all directories.
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// > For example, "**/foo" matches file or directory "foo" anywhere,
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// > the same as pattern "foo".
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// > "**/foo/bar" matches file or directory "bar" anywhere that is directly
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// > under directory "foo".
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// Notice that the '*'s have been replaced as '\\*'
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/^\^*\\\*\\\*\\\//,
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// '**/foo' <-> 'foo'
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() => '^(?:.*\\/)?'
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]
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]
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const DEFAULT_REPLACER_SUFFIX = [
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// starting
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[
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// there will be no leading '/'
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// (which has been replaced by section "leading slash")
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// If starts with '**', adding a '^' to the regular expression also works
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/^(?=[^^])/,
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function startingReplacer () {
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return !/\/(?!$)/.test(this)
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// > If the pattern does not contain a slash /,
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// > Git treats it as a shell glob pattern
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// Actually, if there is only a trailing slash,
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// git also treats it as a shell glob pattern
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? '(?:^|\\/)'
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// > Otherwise, Git treats the pattern as a shell glob suitable for
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// > consumption by fnmatch(3)
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: '^'
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}
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],
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// two globstars
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[
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// Use lookahead assertions so that we could match more than one `'/**'`
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/\\\/\\\*\\\*(?=\\\/|$)/g,
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// Zero, one or several directories
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// should not use '*', or it will be replaced by the next replacer
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// Check if it is not the last `'/**'`
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(match, index, str) => index + 6 < str.length
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// case: /**/
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// > A slash followed by two consecutive asterisks then a slash matches
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// > zero or more directories.
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// > For example, "a/**/b" matches "a/b", "a/x/b", "a/x/y/b" and so on.
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// '/**/'
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? '(?:\\/[^\\/]+)*'
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// case: /**
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// > A trailing `"/**"` matches everything inside.
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// #21: everything inside but it should not include the current folder
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: '\\/.+'
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],
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// intermediate wildcards
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[
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// Never replace escaped '*'
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// ignore rule '\*' will match the path '*'
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// 'abc.*/' -> go
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// 'abc.*' -> skip this rule
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/(^|[^\\]+)\\\*(?=.+)/g,
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// '*.js' matches '.js'
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// '*.js' doesn't match 'abc'
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(match, p1) => `${p1}[^\\/]*`
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],
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// trailing wildcard
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[
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/(\^|\\\/)?\\\*$/,
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(match, p1) => {
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const prefix = p1
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// '\^':
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// '/*' does not match ''
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// '/*' does not match everything
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// '\\\/':
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// 'abc/*' does not match 'abc/'
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? `${p1}[^/]+`
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// 'a*' matches 'a'
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// 'a*' matches 'aa'
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: '[^/]*'
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return `${prefix}(?=$|\\/$)`
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}
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],
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[
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// unescape
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/\\\\\\/g,
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() => '\\'
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]
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]
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const POSITIVE_REPLACERS = [
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...DEFAULT_REPLACER_PREFIX,
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// 'f'
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// matches
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// - /f(end)
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// - /f/
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// - (start)f(end)
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// - (start)f/
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// doesn't match
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// - oof
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// - foo
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// pseudo:
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// -> (^|/)f(/|$)
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// ending
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[
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// 'js' will not match 'js.'
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// 'ab' will not match 'abc'
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/(?:[^*/])$/,
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// 'js*' will not match 'a.js'
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// 'js/' will not match 'a.js'
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// 'js' will match 'a.js' and 'a.js/'
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match => `${match}(?=$|\\/)`
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],
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...DEFAULT_REPLACER_SUFFIX
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]
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const NEGATIVE_REPLACERS = [
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...DEFAULT_REPLACER_PREFIX,
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// #24, #38
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// The MISSING rule of [gitignore docs](https://git-scm.com/docs/gitignore)
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// A negative pattern without a trailing wildcard should not
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// re-include the things inside that directory.
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// eg:
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// ['node_modules/*', '!node_modules']
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// should ignore `node_modules/a.js`
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[
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/(?:[^*])$/,
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match => `${match}(?=$|\\/$)`
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],
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...DEFAULT_REPLACER_SUFFIX
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]
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// A simple cache, because an ignore rule only has only one certain meaning
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const cache = Object.create(null)
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// @param {pattern}
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const make_regex = (pattern, negative, ignorecase) => {
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const r = cache[pattern]
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if (r) {
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return r
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}
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const replacers = negative
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? NEGATIVE_REPLACERS
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: POSITIVE_REPLACERS
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const source = replacers.reduce(
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(prev, current) => prev.replace(current[0], current[1].bind(pattern)),
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pattern
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)
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return cache[pattern] = ignorecase
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? new RegExp(source, 'i')
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: new RegExp(source)
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}
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// > A blank line matches no files, so it can serve as a separator for readability.
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const checkPattern = pattern => pattern
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&& typeof pattern === 'string'
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&& !REGEX_BLANK_LINE.test(pattern)
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// > A line starting with # serves as a comment.
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&& pattern.indexOf('#') !== 0
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const createRule = (pattern, ignorecase) => {
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const origin = pattern
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let negative = false
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// > An optional prefix "!" which negates the pattern;
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if (pattern.indexOf('!') === 0) {
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negative = true
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pattern = pattern.substr(1)
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}
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pattern = pattern
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// > Put a backslash ("\") in front of the first "!" for patterns that
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// > begin with a literal "!", for example, `"\!important!.txt"`.
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.replace(REGEX_LEADING_EXCAPED_EXCLAMATION, '!')
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// > Put a backslash ("\") in front of the first hash for patterns that
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// > begin with a hash.
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.replace(REGEX_LEADING_EXCAPED_HASH, '#')
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const regex = make_regex(pattern, negative, ignorecase)
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return {
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origin,
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pattern,
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negative,
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regex
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}
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}
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class IgnoreBase {
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constructor ({
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ignorecase = true
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} = {}) {
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this._rules = []
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this._ignorecase = ignorecase
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define(this, KEY_IGNORE, true)
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this._initCache()
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}
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_initCache () {
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this._cache = Object.create(null)
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}
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// @param {Array.<string>|string|Ignore} pattern
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add (pattern) {
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this._added = false
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if (typeof pattern === 'string') {
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pattern = pattern.split(/\r?\n/g)
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}
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make_array(pattern).forEach(this._addPattern, this)
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// Some rules have just added to the ignore,
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// making the behavior changed.
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if (this._added) {
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this._initCache()
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}
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return this
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}
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// legacy
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addPattern (pattern) {
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return this.add(pattern)
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}
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_addPattern (pattern) {
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// #32
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if (pattern && pattern[KEY_IGNORE]) {
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this._rules = this._rules.concat(pattern._rules)
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this._added = true
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return
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}
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if (checkPattern(pattern)) {
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const rule = createRule(pattern, this._ignorecase)
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this._added = true
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this._rules.push(rule)
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}
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}
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filter (paths) {
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return make_array(paths).filter(path => this._filter(path))
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}
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createFilter () {
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return path => this._filter(path)
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}
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ignores (path) {
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return !this._filter(path)
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}
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// @returns `Boolean` true if the `path` is NOT ignored
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_filter (path, slices) {
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if (!path) {
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return false
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}
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if (path in this._cache) {
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return this._cache[path]
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}
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if (!slices) {
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// path/to/a.js
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// ['path', 'to', 'a.js']
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slices = path.split(SLASH)
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}
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slices.pop()
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return this._cache[path] = slices.length
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// > It is not possible to re-include a file if a parent directory of
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// > that file is excluded.
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// If the path contains a parent directory, check the parent first
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? this._filter(slices.join(SLASH) + SLASH, slices)
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&& this._test(path)
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// Or only test the path
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: this._test(path)
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}
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// @returns {Boolean} true if a file is NOT ignored
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_test (path) {
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// Explicitly define variable type by setting matched to `0`
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let matched = 0
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this._rules.forEach(rule => {
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// if matched = true, then we only test negative rules
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// if matched = false, then we test non-negative rules
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if (!(matched ^ rule.negative)) {
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matched = rule.negative ^ rule.regex.test(path)
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}
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})
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return !matched
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}
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}
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// Windows
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// --------------------------------------------------------------
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/* istanbul ignore if */
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if (
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// Detect `process` so that it can run in browsers.
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typeof process !== 'undefined'
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&& (
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process.env && process.env.IGNORE_TEST_WIN32
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|| process.platform === 'win32'
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)
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) {
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const filter = IgnoreBase.prototype._filter
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/* eslint no-control-regex: "off" */
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const make_posix = str => /^\\\\\?\\/.test(str)
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|| /[^\x00-\x80]+/.test(str)
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? str
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: str.replace(/\\/g, '/')
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IgnoreBase.prototype._filter = function filterWin32 (path, slices) {
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path = make_posix(path)
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return filter.call(this, path, slices)
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}
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}
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module.exports = options => new IgnoreBase(options)
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