JavaScriptMinifierTest.php

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<?php
 
class JavaScriptMinifierTest extends PHPUnit\Framework\TestCase {
 
    use MediaWikiCoversValidator;
 
    public static function provideCases() {
        return [
 
            // Basic whitespace and comments that should be stripped entirely
            [ "\r\t\f \v\n\r", "" ],
            [ "/* Foo *\n*bar\n*/", "" ],
 
            [
                "/**\n * Foo\n * {\n * 'bar' : {\n * "
                    . "//Multiple rules with configurable operators\n * 'baz' : false\n * }\n */",
                "" ],
 
            [
                "'  Foo  \\'  bar  \\\n  baz  \\'  quox  '  .length",
                "'  Foo  \\'  bar  \\\n  baz  \\'  quox  '.length"
            ],
            [
                "\"  Foo  \\\"  bar  \\\n  baz  \\\"  quox  \"  .length",
                "\"  Foo  \\\"  bar  \\\n  baz  \\\"  quox  \".length"
            ],
            [ "// Foo b/ar baz", "" ],
            [
                "/  Foo  \\/  bar  [  /  \\]  /  ]  baz  /  .length",
                "/  Foo  \\/  bar  [  /  \\]  /  ]  baz  /.length"
            ],
 
            // HTML comments
            [ "<!-- Foo bar", "" ],
            [ "<!-- Foo --> bar", "" ],
            [ "--> Foo", "" ],
            [ "x --> y", "x-->y" ],
 
            // Semicolon insertion
            [ "(function(){return\nx;})", "(function(){return\nx;})" ],
            [ "throw\nx;", "throw\nx;" ],
            [ "while(p){continue\nx;}", "while(p){continue\nx;}" ],
            [ "while(p){break\nx;}", "while(p){break\nx;}" ],
            [ "var\nx;", "var x;" ],
            [ "x\ny;", "x\ny;" ],
            [ "x\n++y;", "x\n++y;" ],
            [ "x\n!y;", "x\n!y;" ],
            [ "x\n{y}", "x\n{y}" ],
            [ "x\n+y;", "x+y;" ],
            [ "x\n(y);", "x(y);" ],
            [ "5.\nx;", "5.\nx;" ],
            [ "0xFF.\nx;", "0xFF.x;" ],
            [ "5.3.\nx;", "5.3.x;" ],
 
            // Cover failure case for incomplete hex literal
            [ "0x;", false, false ],
 
            // Cover failure case for number with no digits after E
            [ "1.4E", false, false ],
 
            // Cover failure case for number with several E
            [ "1.4EE2", false, false ],
            [ "1.4EE", false, false ],
 
            // Cover failure case for number with several E (nonconsecutive)
            // FIXME: This is invalid, but currently tolerated
            [ "1.4E2E3", "1.4E2 E3", false ],
 
            // Semicolon insertion between an expression having an inline
            // comment after it, and a statement on the next line (T29046).
            [
                "var a = this //foo bar \n for ( b = 0; c < d; b++ ) {}",
                "var a=this\nfor(b=0;c<d;b++){}"
            ],
 
            // Cover failure case of incomplete regexp at end of file (T75556)
            // FIXME: This is invalid, but currently tolerated
            [ "*/", "*/", false ],
 
            // Cover failure case of incomplete char class in regexp (T75556)
            // FIXME: This is invalid, but currently tolerated
            [ "/a[b/.test", "/a[b/.test", false ],
 
            // Cover failure case of incomplete string at end of file (T75556)
            // FIXME: This is invalid, but currently tolerated
            [ "'a", "'a", false ],
 
            // Token separation
            [ "x  in  y", "x in y" ],
            [ "/x/g  in  y", "/x/g in y" ],
            [ "x  in  30", "x in 30" ],
            [ "x  +  ++  y", "x+ ++y" ],
            [ "x ++  +  y", "x++ +y" ],
            [ "x  /  /y/.exec(z)", "x/ /y/.exec(z)" ],
 
            // State machine
            [ "/  x/g", "/  x/g" ],
            [ "(function(){return/  x/g})", "(function(){return/  x/g})" ],
            [ "+/  x/g", "+/  x/g" ],
            [ "++/  x/g", "++/  x/g" ],
            [ "x/  x/g", "x/x/g" ],
            [ "(/  x/g)", "(/  x/g)" ],
            [ "if(/  x/g);", "if(/  x/g);" ],
            [ "(x/  x/g)", "(x/x/g)" ],
            [ "([/  x/g])", "([/  x/g])" ],
            [ "+x/  x/g", "+x/x/g" ],
            [ "{}/  x/g", "{}/  x/g" ],
            [ "+{}/  x/g", "+{}/x/g" ],
            [ "(x)/  x/g", "(x)/x/g" ],
            [ "if(x)/  x/g", "if(x)/  x/g" ],
            [ "for(x;x;{}/  x/g);", "for(x;x;{}/x/g);" ],
            [ "x;x;{}/  x/g", "x;x;{}/  x/g" ],
            [ "x:{}/  x/g", "x:{}/  x/g" ],
            [ "switch(x){case y?z:{}/  x/g:{}/  x/g;}", "switch(x){case y?z:{}/x/g:{}/  x/g;}" ],
            [ "function x(){}/  x/g", "function x(){}/  x/g" ],
            [ "+function x(){}/  x/g", "+function x(){}/x/g" ],
 
            // Multiline quoted string
            [ "var foo=\"\\\nblah\\\n\";", "var foo=\"\\\nblah\\\n\";" ],
 
            // Multiline quoted string followed by string with spaces
            [
                "var foo=\"\\\nblah\\\n\";\nvar baz = \" foo \";\n",
                "var foo=\"\\\nblah\\\n\";var baz=\" foo \";"
            ],
 
            // URL in quoted string ( // is not a comment)
            [
                "aNode.setAttribute('href','http://foo.bar.org/baz');",
                "aNode.setAttribute('href','http://foo.bar.org/baz');"
            ],
 
            // URL in quoted string after multiline quoted string
            [
                "var foo=\"\\\nblah\\\n\";\naNode.setAttribute('href','http://foo.bar.org/baz');",
                "var foo=\"\\\nblah\\\n\";aNode.setAttribute('href','http://foo.bar.org/baz');"
            ],
 
            // Division vs. regex nastiness
            [
                "alert( (10+10) / '/'.charCodeAt( 0 ) + '//' );",
                "alert((10+10)/'/'.charCodeAt(0)+'//');"
            ],
            [ "if(1)/a /g.exec('Pa ss');", "if(1)/a /g.exec('Pa ss');" ],
 
            // newline insertion after 1000 chars: break after the "++", not before
            [ str_repeat( ';', 996 ) . "if(x++);", str_repeat( ';', 996 ) . "if(x++\n);" ],
 
            // Unicode letter characters should pass through ok in identifiers (T33187)
            [ "var KaŝSkatolVal = {}", 'var KaŝSkatolVal={}' ],
 
            // Per spec unicode char escape values should work in identifiers,
            // as long as it's a valid char. In future it might get normalized.
            [ "var Ka\\u015dSkatolVal = {}", 'var Ka\\u015dSkatolVal={}' ],
 
            // Some structures that might look invalid at first sight
            [ "var a = 5.;", "var a=5.;" ],
            [ "5.0.toString();", "5.0.toString();" ],
            [ "5..toString();", "5..toString();" ],
            // Cover failure case for too many decimal points
            [ "5...toString();", false ],
            [ "5.\n.toString();", '5..toString();' ],
 
            // Boolean minification (!0 / !1)
            [ "var a = { b: true };", "var a={b:!0};" ],
            [ "var a = { true: 12 };", "var a={true:12};", false ],
            [ "a.true = 12;", "a.true=12;", false ],
            [ "a.foo = true;", "a.foo=!0;" ],
            [ "a.foo = false;", "a.foo=!1;" ],
        ];
    }
 
    public function testMinifyOutput( $code, $expectedOutput, $expectedValid = true ) {
        $minified = JavaScriptMinifier::minify( $code );
 
        // JSMin+'s parser will throw an exception if output is not valid JS.
        // suppression of warnings needed for stupid crap
        if ( $expectedValid ) {
            Wikimedia\suppressWarnings();
            $parser = new JSParser();
            Wikimedia\restoreWarnings();
            $parser->parse( $minified, 'minify-test.js', 1 );
        }
 
        $this->assertEquals(
            $expectedOutput,
            $minified,
            "Minified output should be in the form expected."
        );
    }
 
    public static function provideExponentLineBreaking() {
        return [
            [
                // This one gets interpreted all together by the prior code;
                // no break at the 'E' happens.
                '1.23456789E55',
            ],
            [
                // This one breaks under the bad code; splits between 'E' and '+'
                '1.23456789E+5',
            ],
            [
                // This one breaks under the bad code; splits between 'E' and '-'
                '1.23456789E-5',
            ],
        ];
    }
 
    public function testExponentLineBreaking( $num ) {
        // Long line breaking was being incorrectly done between the base and
        // exponent part of a number, causing a syntax error. The line should
        // instead break at the start of the number. (T34548)
        $prefix = 'var longVarName' . str_repeat( '_', 973 ) . '=';
        $suffix = ',shortVarName=0;';
 
        $input = $prefix . $num . $suffix;
        $expected = $prefix . "\n" . $num . $suffix;
 
        $minified = JavaScriptMinifier::minify( $input );
 
        $this->assertEquals( $expected, $minified, "Line breaks must not occur in middle of exponent" );
    }
}