diff options
author | Frédéric Guillot <fred@miniflux.net> | 2017-11-19 21:10:04 -0800 |
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committer | Frédéric Guillot <fred@miniflux.net> | 2017-11-19 22:01:46 -0800 |
commit | 8ffb773f43c8dc54801ca1d111854e7e881c93c9 (patch) | |
tree | 38133a2fc612597a75fed1d13e5b4042f58a2b7e /vendor/github.com/tdewolff/minify/js/js.go |
First commit
Diffstat (limited to 'vendor/github.com/tdewolff/minify/js/js.go')
-rw-r--r-- | vendor/github.com/tdewolff/minify/js/js.go | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/vendor/github.com/tdewolff/minify/js/js.go b/vendor/github.com/tdewolff/minify/js/js.go new file mode 100644 index 0000000..1f6c0b8 --- /dev/null +++ b/vendor/github.com/tdewolff/minify/js/js.go @@ -0,0 +1,88 @@ +// Package js minifies ECMAScript5.1 following the specifications at http://www.ecma-international.org/ecma-262/5.1/. +package js // import "github.com/tdewolff/minify/js" + +import ( + "io" + + "github.com/tdewolff/minify" + "github.com/tdewolff/parse" + "github.com/tdewolff/parse/js" +) + +var ( + spaceBytes = []byte(" ") + newlineBytes = []byte("\n") +) + +//////////////////////////////////////////////////////////////// + +// DefaultMinifier is the default minifier. +var DefaultMinifier = &Minifier{} + +// Minifier is a JS minifier. +type Minifier struct{} + +// Minify minifies JS data, it reads from r and writes to w. +func Minify(m *minify.M, w io.Writer, r io.Reader, params map[string]string) error { + return DefaultMinifier.Minify(m, w, r, params) +} + +// Minify minifies JS data, it reads from r and writes to w. +func (o *Minifier) Minify(_ *minify.M, w io.Writer, r io.Reader, _ map[string]string) error { + prev := js.LineTerminatorToken + prevLast := byte(' ') + lineTerminatorQueued := false + whitespaceQueued := false + + l := js.NewLexer(r) + defer l.Restore() + + for { + tt, data := l.Next() + if tt == js.ErrorToken { + if l.Err() != io.EOF { + return l.Err() + } + return nil + } else if tt == js.LineTerminatorToken { + lineTerminatorQueued = true + } else if tt == js.WhitespaceToken { + whitespaceQueued = true + } else if tt == js.CommentToken { + if len(data) > 5 && data[1] == '*' && data[2] == '!' { + if _, err := w.Write(data[:3]); err != nil { + return err + } + comment := parse.TrimWhitespace(parse.ReplaceMultipleWhitespace(data[3 : len(data)-2])) + if _, err := w.Write(comment); err != nil { + return err + } + if _, err := w.Write(data[len(data)-2:]); err != nil { + return err + } + } + } else { + first := data[0] + if (prev == js.IdentifierToken || prev == js.NumericToken || prev == js.PunctuatorToken || prev == js.StringToken || prev == js.RegexpToken) && + (tt == js.IdentifierToken || tt == js.NumericToken || tt == js.StringToken || tt == js.PunctuatorToken || tt == js.RegexpToken) { + if lineTerminatorQueued && (prev != js.PunctuatorToken || prevLast == '}' || prevLast == ']' || prevLast == ')' || prevLast == '+' || prevLast == '-' || prevLast == '"' || prevLast == '\'') && + (tt != js.PunctuatorToken || first == '{' || first == '[' || first == '(' || first == '+' || first == '-' || first == '!' || first == '~') { + if _, err := w.Write(newlineBytes); err != nil { + return err + } + } else if whitespaceQueued && (prev != js.StringToken && prev != js.PunctuatorToken && tt != js.PunctuatorToken || (prevLast == '+' || prevLast == '-') && first == prevLast) { + if _, err := w.Write(spaceBytes); err != nil { + return err + } + } + } + if _, err := w.Write(data); err != nil { + return err + } + prev = tt + prevLast = data[len(data)-1] + lineTerminatorQueued = false + whitespaceQueued = false + } + } +} |