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Class JS

JavaScript minifier.

Please report bugs on https://github.com/matthiasmullie/minify/issues

MatthiasMullie\Minify\Minify
Extended by MatthiasMullie\Minify\JS
Namespace: MatthiasMullie\Minify
Copyright: Copyright (c) 2012, Matthias Mullie. All rights reserved
License: License
Author: Matthias Mullie minify@mullie.eu
Author: Tijs Verkoyen minify@verkoyen.eu
Located at Sources/minify/src/JS.php
Methods summary
public
# __construct( )

Init the minify class - optionally, code may be passed along already.

Init the minify class - optionally, code may be passed along already.

Overrides

MatthiasMullie\Minify\Minify::__construct()
public string
# execute( string[optional] $path = null )

Minify the data. Perform JS optimizations.

Minify the data. Perform JS optimizations.

Parameters

$path
Path to write the data to

Returns

string
The minified data
protected
# stripComments( )

Strip comments from source code.

Strip comments from source code.
protected
# extractRegex( )

JS can have /-delimited regular expressions, like: /ab+c/.match(string).

JS can have /-delimited regular expressions, like: /ab+c/.match(string).

The content inside the regex can contain characters that may be confused for JS code: e.g. it could contain whitespace it needs to match & we don't want to strip whitespace in there.

The regex can be pretty simple: we don't have to care about comments, (which also use slashes) because stripComments() will have stripped those already.

This method will replace all string content with simple REGEX# placeholder text, so we've rid all regular expressions from characters that may be misinterpreted. Original regex content will be saved in $this->extracted and after doing all other minifying, we can restore the original content via restoreRegex()
protected string
# stripWhitespace( string $content )

Strip whitespace.

Strip whitespace.

We won't strip all whitespace, but as much as possible. The thing that we'll preserve are newlines we're unsure about. JavaScript doesn't require statements to be terminated with a semicolon. It will automatically fix missing semicolons with ASI (automatic semi- colon insertion) at the end of line causing errors (without semicolon.)

Because it's sometimes hard to tell if a newline is part of a statement that should be terminated or not, we'll just leave some of them alone.

Parameters

$content
The content to strip the whitespace for

Returns

string
protected string[]
# getOperatorsForRegex( array $operators, string $delimiter = '/' )

We'll strip whitespace around certain operators with regular expressions. This will prepare the given array by escaping all characters.

We'll strip whitespace around certain operators with regular expressions. This will prepare the given array by escaping all characters.

Parameters

$operators
$delimiter

Returns

string[]
protected string[]
# getKeywordsForRegex( array $keywords, string $delimiter = '/' )

We'll strip whitespace around certain keywords with regular expressions. This will prepare the given array by escaping all characters.

We'll strip whitespace around certain keywords with regular expressions. This will prepare the given array by escaping all characters.

Parameters

$keywords
$delimiter

Returns

string[]
protected string
# propertyNotation( string $content )

Replaces all occurrences of array['key'] by array.key.

Replaces all occurrences of array['key'] by array.key.

Parameters

$content

Returns

string
protected string
# shortenBools( string $content )

Replaces true & false by !0 and !1.

Replaces true & false by !0 and !1.

Parameters

$content

Returns

string
Methods inherited from MatthiasMullie\Minify\Minify
add(), cache(), canImportFile(), extractStrings(), gzip(), load(), minify(), openFileForWriting(), registerPattern(), replace(), replacePattern(), restoreExtractedData(), save(), writeToFile()
Constants summary
string REGEX_VARIABLE

Var-matching regex based on https://stackoverflow.com/a/9337047/802993.

Var-matching regex based on https://stackoverflow.com/a/9337047/802993.

Note that regular expressions using that bit must have the PCRE_UTF8 pattern modifier (/u) set.
# 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Properties summary
protected string[] $keywordsReserved

Full list of JavaScript reserved words. Will be loaded from /data/js/keywords_reserved.txt.

Full list of JavaScript reserved words. Will be loaded from /data/js/keywords_reserved.txt.

See

https://mathiasbynens.be/notes/reserved-keywords
# array()
protected string[] $keywordsBefore

List of JavaScript reserved words that accept a <variable, value, ...> after them. Some end of lines are not the end of a statement, like with these keywords.

List of JavaScript reserved words that accept a <variable, value, ...> after them. Some end of lines are not the end of a statement, like with these keywords.

E.g.: we shouldn't insert a ; after this else else console.log('this is quite fine')

Will be loaded from /data/js/keywords_before.txt
# array()
protected string[] $keywordsAfter

List of JavaScript reserved words that accept a <variable, value, ...> before them. Some end of lines are not the end of a statement, like when continued by one of these keywords on the newline.

List of JavaScript reserved words that accept a <variable, value, ...> before them. Some end of lines are not the end of a statement, like when continued by one of these keywords on the newline.

E.g.: we shouldn't insert a ; before this instanceof variable instanceof String

Will be loaded from /data/js/keywords_after.txt
# array()
protected string[] $operators

List of all JavaScript operators.

List of all JavaScript operators.

Will be loaded from /data/js/operators.txt

See

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators
# array()
protected string[] $operatorsBefore

List of JavaScript operators that accept a <variable, value, ...> after them. Some end of lines are not the end of a statement, like with these operators.

List of JavaScript operators that accept a <variable, value, ...> after them. Some end of lines are not the end of a statement, like with these operators.

Note: Most operators are fine, we've only removed !, ++ and --. There can't be a newline separating ! and whatever it is negating. ++ & -- have to be joined with the value they're in-/decrementing.

Will be loaded from /data/js/operators_before.txt

See

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators
# array()
protected string[] $operatorsAfter

List of JavaScript operators that accept a <variable, value, ...> before them. Some end of lines are not the end of a statement, like when continued by one of these operators on the newline.

List of JavaScript operators that accept a <variable, value, ...> before them. Some end of lines are not the end of a statement, like when continued by one of these operators on the newline.

Note: Most operators are fine, we've only removed ), ], ++ and --. ++ & -- have to be joined with the value they're in-/decrementing. ) & ] are "special" in that they have lots or usecases. () for example is used for function calls, for grouping, in if () and for (), ...

Will be loaded from /data/js/operators_after.txt

See

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators
# array()
Properties inherited from MatthiasMullie\Minify\Minify
$data, $extracted, $patterns
API documentation generated by ApiGen