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Copy pathcss.go
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673 lines (652 loc) · 20.5 KB
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package css // import "github.com/tdewolff/minify/css"
/*
Uses http://www.w3.org/TR/2010/PR-css3-color-20101028/ for colors
*/
import (
"bytes"
"encoding/base64"
"encoding/hex"
"errors"
"io"
"math"
"net/url"
"strconv"
"github.com/tdewolff/minify"
"github.com/tdewolff/parse"
"github.com/tdewolff/parse/css"
)
var epsilon = 0.00001
var shortenColorHex = map[string][]byte{
"#000080": []byte("navy"),
"#008000": []byte("green"),
"#008080": []byte("teal"),
"#4b0082": []byte("indigo"),
"#800000": []byte("maroon"),
"#800080": []byte("purple"),
"#808000": []byte("olive"),
"#808080": []byte("gray"),
"#a0522d": []byte("sienna"),
"#a52a2a": []byte("brown"),
"#c0c0c0": []byte("silver"),
"#cd853f": []byte("peru"),
"#d2b48c": []byte("tan"),
"#da70d6": []byte("orchid"),
"#dda0dd": []byte("plum"),
"#ee82ee": []byte("violet"),
"#f0e68c": []byte("khaki"),
"#f0ffff": []byte("azure"),
"#f5deb3": []byte("wheat"),
"#f5f5dc": []byte("beige"),
"#fa8072": []byte("salmon"),
"#faf0e6": []byte("linen"),
"#ff6347": []byte("tomato"),
"#ff7f50": []byte("coral"),
"#ffa500": []byte("orange"),
"#ffc0cb": []byte("pink"),
"#ffd700": []byte("gold"),
"#ffe4c4": []byte("bisque"),
"#fffafa": []byte("snow"),
"#fffff0": []byte("ivory"),
"#ff0000": []byte("red"),
"#f00": []byte("red"),
}
var shortenColorName = map[css.Hash][]byte{
css.Black: []byte("#000"),
css.Darkblue: []byte("#00008b"),
css.Mediumblue: []byte("#0000cd"),
css.Darkgreen: []byte("#006400"),
css.Darkcyan: []byte("#008b8b"),
css.Deepskyblue: []byte("#00bfff"),
css.Darkturquoise: []byte("#00ced1"),
css.Mediumspringgreen: []byte("#00fa9a"),
css.Springgreen: []byte("#00ff7f"),
css.Midnightblue: []byte("#191970"),
css.Dodgerblue: []byte("#1e90ff"),
css.Lightseagreen: []byte("#20b2aa"),
css.Forestgreen: []byte("#228b22"),
css.Seagreen: []byte("#2e8b57"),
css.Darkslategray: []byte("#2f4f4f"),
css.Limegreen: []byte("#32cd32"),
css.Mediumseagreen: []byte("#3cb371"),
css.Turquoise: []byte("#40e0d0"),
css.Royalblue: []byte("#4169e1"),
css.Steelblue: []byte("#4682b4"),
css.Darkslateblue: []byte("#483d8b"),
css.Mediumturquoise: []byte("#48d1cc"),
css.Darkolivegreen: []byte("#556b2f"),
css.Cadetblue: []byte("#5f9ea0"),
css.Cornflowerblue: []byte("#6495ed"),
css.Mediumaquamarine: []byte("#66cdaa"),
css.Slateblue: []byte("#6a5acd"),
css.Olivedrab: []byte("#6b8e23"),
css.Slategray: []byte("#708090"),
css.Lightslateblue: []byte("#789"),
css.Mediumslateblue: []byte("#7b68ee"),
css.Lawngreen: []byte("#7cfc00"),
css.Chartreuse: []byte("#7fff00"),
css.Aquamarine: []byte("#7fffd4"),
css.Lightskyblue: []byte("#87cefa"),
css.Blueviolet: []byte("#8a2be2"),
css.Darkmagenta: []byte("#8b008b"),
css.Saddlebrown: []byte("#8b4513"),
css.Darkseagreen: []byte("#8fbc8f"),
css.Lightgreen: []byte("#90ee90"),
css.Mediumpurple: []byte("#9370db"),
css.Darkviolet: []byte("#9400d3"),
css.Palegreen: []byte("#98fb98"),
css.Darkorchid: []byte("#9932cc"),
css.Yellowgreen: []byte("#9acd32"),
css.Darkgray: []byte("#a9a9a9"),
css.Lightblue: []byte("#add8e6"),
css.Greenyellow: []byte("#adff2f"),
css.Paleturquoise: []byte("#afeeee"),
css.Lightsteelblue: []byte("#b0c4de"),
css.Powderblue: []byte("#b0e0e6"),
css.Firebrick: []byte("#b22222"),
css.Darkgoldenrod: []byte("#b8860b"),
css.Mediumorchid: []byte("#ba55d3"),
css.Rosybrown: []byte("#bc8f8f"),
css.Darkkhaki: []byte("#bdb76b"),
css.Mediumvioletred: []byte("#c71585"),
css.Indianred: []byte("#cd5c5c"),
css.Chocolate: []byte("#d2691e"),
css.Lightgray: []byte("#d3d3d3"),
css.Goldenrod: []byte("#daa520"),
css.Palevioletred: []byte("#db7093"),
css.Gainsboro: []byte("#dcdcdc"),
css.Burlywood: []byte("#deb887"),
css.Lightcyan: []byte("#e0ffff"),
css.Lavender: []byte("#e6e6fa"),
css.Darksalmon: []byte("#e9967a"),
css.Palegoldenrod: []byte("#eee8aa"),
css.Lightcoral: []byte("#f08080"),
css.Aliceblue: []byte("#f0f8ff"),
css.Honeydew: []byte("#f0fff0"),
css.Sandybrown: []byte("#f4a460"),
css.Whitesmoke: []byte("#f5f5f5"),
css.Mintcream: []byte("#f5fffa"),
css.Ghostwhite: []byte("#f8f8ff"),
css.Antiquewhite: []byte("#faebd7"),
css.Lightgoldenrodyellow: []byte("#fafad2"),
css.Fuchsia: []byte("#f0f"),
css.Magenta: []byte("#f0f"),
css.Deeppink: []byte("#ff1493"),
css.Orangered: []byte("#ff4500"),
css.Darkorange: []byte("#ff8c00"),
css.Lightsalmon: []byte("#ffa07a"),
css.Lightpink: []byte("#ffb6c1"),
css.Peachpuff: []byte("#ffdab9"),
css.Navajowhite: []byte("#ffdead"),
css.Moccasin: []byte("#ffe4b5"),
css.Mistyrose: []byte("#ffe4e1"),
css.Blanchedalmond: []byte("#ffebcd"),
css.Papayawhip: []byte("#ffefd5"),
css.Lavenderblush: []byte("#fff0f5"),
css.Seashell: []byte("#fff5ee"),
css.Cornsilk: []byte("#fff8dc"),
css.Lemonchiffon: []byte("#fffacd"),
css.Floralwhite: []byte("#fffaf0"),
css.Yellow: []byte("#ff0"),
css.Lightyellow: []byte("#ffffe0"),
css.White: []byte("#fff"),
}
////////////////////////////////////////////////////////////////
type cssMinifier struct {
m minify.Minifier
w io.Writer
p *css.Parser
semicolonQueued bool
}
// Minify minifies CSS files, it reads from r and writes to w.
func Minify(m minify.Minifier, _ string, w io.Writer, r io.Reader) error {
c := &cssMinifier{
m,
w,
css.NewParser(r),
false,
}
var err error
for {
gt, node := c.p.Next()
if gt == css.ErrorGrammar {
err = c.p.Err()
break
} else if err = c.minifyRecursively(gt, node); err != nil {
break
}
}
if err != io.EOF {
return err
}
return nil
}
func (c *cssMinifier) minifyRecursively(rootGt css.GrammarType, rootNode css.Node) error {
if rootGt != css.ErrorGrammar && rootGt != css.TokenGrammar && c.semicolonQueued { // it is only TokenGrammar for CDO and CDC
if _, err := c.w.Write([]byte(";")); err != nil {
return err
}
c.semicolonQueued = false
}
if rootGt == css.AtRuleGrammar {
atRule := rootNode.(*css.AtRuleNode)
if _, err := c.w.Write(atRule.Name.Data); err != nil {
return err
}
if err := c.minifyAtRuleNodes(atRule.Nodes); err != nil {
return err
}
hasRules := false
for {
gt, node := c.p.Next()
if gt == css.ErrorGrammar {
return c.p.Err()
} else if gt == css.EndAtRuleGrammar {
break
} else if !hasRules {
if _, err := c.w.Write([]byte("{")); err != nil {
return err
}
hasRules = true
}
if err := c.minifyRecursively(gt, node); err != nil {
return err
}
}
if hasRules {
if _, err := c.w.Write([]byte("}")); err != nil {
return err
}
c.semicolonQueued = false
} else {
c.semicolonQueued = true
}
} else if rootGt == css.RulesetGrammar {
ruleset := rootNode.(*css.RulesetNode)
if err := c.minifySelectors(ruleset.Selectors); err != nil {
return err
}
if _, err := c.w.Write([]byte("{")); err != nil {
return err
}
for {
gt, node := c.p.Next()
if gt == css.ErrorGrammar {
return c.p.Err()
} else if gt == css.EndRulesetGrammar {
break
}
if err := c.minifyRecursively(gt, node); err != nil {
return err
}
}
if _, err := c.w.Write([]byte("}")); err != nil {
return err
}
c.semicolonQueued = false
} else if rootGt == css.DeclarationGrammar {
if err := c.minifyDeclaration(rootNode.(*css.DeclarationNode)); err != nil {
return err
}
} else if rootGt == css.TokenGrammar {
if _, err := c.w.Write(rootNode.(*css.TokenNode).Data); err != nil {
return err
}
}
return nil
}
func (c *cssMinifier) minifyAtRuleNodes(nodes []css.Node) error {
for i, node := range nodes {
if i != 0 {
var t *css.TokenNode
if k, ok := nodes[i-1].(*css.TokenNode); ok && len(k.Data) == 1 {
t = k
} else if k, ok := nodes[i].(*css.TokenNode); ok && len(k.Data) == 1 {
t = k
}
if t == nil || t.Data[0] != ',' {
if _, err := c.w.Write([]byte(" ")); err != nil {
return err
}
}
} else {
if _, err := c.w.Write([]byte(" ")); err != nil {
return err
}
}
if _, err := node.WriteTo(c.w); err != nil {
return err
}
}
return nil
}
func (c *cssMinifier) minifySelectors(selectors []*css.SelectorNode) error {
for i, sel := range selectors {
if i != 0 {
if _, err := c.w.Write([]byte(",")); err != nil {
return err
}
}
inAttr := false
isClass := false
for _, elem := range sel.Elems {
if !inAttr && elem.TokenType == css.LeftBracketToken {
inAttr = true
} else if inAttr && elem.TokenType == css.RightBracketToken {
inAttr = false
} else if inAttr && elem.TokenType == css.StringToken {
s := elem.Data[1 : len(elem.Data)-1]
if css.IsIdent([]byte(s)) {
if _, err := c.w.Write(s); err != nil {
return err
}
continue
}
} else if !inAttr && elem.TokenType == css.DelimToken && elem.Data[0] == '.' {
isClass = true
} else if !inAttr && elem.TokenType == css.IdentToken {
if !isClass {
parse.ToLower(elem.Data)
}
isClass = false
}
if _, err := c.w.Write(elem.Data); err != nil {
return err
}
}
}
return nil
}
func (c *cssMinifier) minifyDeclaration(decl *css.DeclarationNode) error {
if _, err := c.w.Write(append(decl.Prop.Data, ':')); err != nil {
return err
}
// shorten values
progid := false
for i, val := range decl.Vals {
switch node := val.(type) {
case *css.TokenNode:
if !progid {
if i == 0 && css.ToHash(node.Data) == css.Progid {
progid = true
continue
}
c.shortenToken(node)
}
case *css.FunctionNode:
if !progid {
parse.ToLower(node.Name.Data)
}
decl.Vals[i] = c.shortenFunction(node)
}
}
prop := css.ToHash(decl.Prop.Data)
if prop == css.Margin || prop == css.Padding || prop == css.Border_Width {
tokens := make([]*css.TokenNode, 0, 4)
for _, val := range decl.Vals {
if t, ok := val.(*css.TokenNode); ok {
tokens = append(tokens, t)
} else {
tokens = []*css.TokenNode{}
break
}
}
if len(tokens) == 2 {
if bytes.Equal(tokens[0].Data, tokens[1].Data) {
decl.Vals = []css.Node{decl.Vals[0]}
}
} else if len(tokens) == 3 {
if bytes.Equal(tokens[0].Data, tokens[1].Data) && bytes.Equal(tokens[0].Data, tokens[2].Data) {
decl.Vals = []css.Node{decl.Vals[0]}
} else if bytes.Equal(tokens[0].Data, tokens[2].Data) {
decl.Vals = []css.Node{decl.Vals[0], decl.Vals[1]}
}
} else if len(tokens) == 4 {
if bytes.Equal(tokens[0].Data, tokens[1].Data) && bytes.Equal(tokens[0].Data, tokens[2].Data) && bytes.Equal(tokens[0].Data, tokens[3].Data) {
decl.Vals = []css.Node{decl.Vals[0]}
} else if bytes.Equal(tokens[0].Data, tokens[2].Data) && bytes.Equal(tokens[1].Data, tokens[3].Data) {
decl.Vals = []css.Node{decl.Vals[0], decl.Vals[1]}
} else if bytes.Equal(tokens[1].Data, tokens[3].Data) {
decl.Vals = []css.Node{decl.Vals[0], decl.Vals[1], decl.Vals[2]}
}
}
} else if prop == css.Font || prop == css.Font_Family || prop == css.Font_Weight {
for _, val := range decl.Vals {
if t, ok := val.(*css.TokenNode); ok {
if t.TokenType == css.IdentToken && (prop == css.Font || prop == css.Font_Weight) {
val := css.ToHash(t.Data)
if val == css.Normal && prop == css.Font_Weight {
// normal could also be specified for font-variant, not just font-weight
t.TokenType = css.NumberToken
t.Data = []byte("400")
} else if val == css.Bold {
t.TokenType = css.NumberToken
t.Data = []byte("700")
}
} else if t.TokenType == css.StringToken && (prop == css.Font || prop == css.Font_Family) {
parse.ToLower(t.Data)
s := t.Data[1 : len(t.Data)-1]
unquote := true
for _, split := range bytes.Split(s, []byte(" ")) {
val := css.ToHash(split)
// if len is zero, it contains two consecutive spaces
if val == css.Inherit || val == css.Serif || val == css.Sans_Serif || val == css.Monospace || val == css.Fantasy || val == css.Cursive || val == css.Initial || val == css.Default ||
len(split) == 0 || !css.IsIdent(split) {
unquote = false
break
}
}
if unquote {
t.Data = s
}
}
}
}
} else if (prop == css.Outline || prop == css.Background || prop == css.Border || prop == css.Border_Bottom || prop == css.Border_Left || prop == css.Border_Right || prop == css.Border_Top) && len(decl.Vals) == 1 {
if t, ok := decl.Vals[0].(*css.TokenNode); ok && css.ToHash(t.Data) == css.None {
t.TokenType = css.NumberToken
t.Data = []byte("0")
}
} else if prop == css.Filter && len(decl.Vals) == 7 {
if fun, ok := decl.Vals[6].(*css.FunctionNode); ok && bytes.Equal(fun.Name.Data, []byte("Alpha")) {
tokens := []byte{}
for _, val := range decl.Vals[:len(decl.Vals)-1] {
if t, ok := val.(*css.TokenNode); ok {
tokens = append(tokens, t.Data...)
} else {
tokens = []byte{}
break
}
}
if bytes.Equal(tokens, []byte("progid:DXImageTransform.Microsoft.")) && len(fun.Args) == 1 && len(fun.Args[0].Vals) == 3 {
if opacity, ok := fun.Args[0].Vals[0].(*css.TokenNode); ok {
parse.ToLower(opacity.Data)
if is, ok := fun.Args[0].Vals[1].(*css.TokenNode); ok && is.Data[0] == '=' && bytes.Equal(opacity.Data, []byte("opacity")) {
fun.Name.TokenType = css.FunctionToken
fun.Name.Data = []byte("alpha")
decl.Vals = []css.Node{fun}
}
}
}
}
} else if len(decl.Vals) == 1 && bytes.Equal(decl.Prop.Data, []byte("-ms-filter")) {
if t, ok := decl.Vals[0].(*css.TokenNode); ok {
alpha := []byte("progid:DXImageTransform.Microsoft.Alpha(Opacity=")
if t.TokenType == css.StringToken && bytes.HasPrefix(t.Data[1:len(t.Data)-1], alpha) {
t.Data = append(append([]byte{t.Data[0]}, []byte("alpha(opacity=")...), t.Data[1+len(alpha):]...)
}
}
}
for i, val := range decl.Vals {
if i != 0 {
var t *css.TokenNode
if k, ok := decl.Vals[i-1].(*css.TokenNode); ok && len(k.Data) == 1 && k.TokenType != css.IdentToken {
t = k
} else if k, ok := decl.Vals[i].(*css.TokenNode); ok && len(k.Data) == 1 && k.TokenType != css.IdentToken {
t = k
}
if t == nil || (t.Data[0] != ',' && t.Data[0] != '/' && t.Data[0] != ':' && t.Data[0] != '.' && t.Data[0] != '!') {
if _, err := c.w.Write([]byte(" ")); err != nil {
return err
}
}
}
if _, err := val.WriteTo(c.w); err != nil {
return err
}
}
c.semicolonQueued = true
return nil
}
func (c *cssMinifier) shortenFunction(fun *css.FunctionNode) css.Node {
simpleFunction := true
for _, arg := range fun.Args {
for j, val := range arg.Vals {
if t, ok := val.(*css.TokenNode); ok {
c.shortenToken(t)
if j > 1 {
simpleFunction = false
}
} else {
simpleFunction = false
}
}
}
var node css.Node = fun
if simpleFunction {
name := css.ToHash(fun.Name.Data)
if name == css.Rgba && len(fun.Args) == 4 {
d, _ := strconv.ParseFloat(string(fun.Args[3].Vals[0].(*css.TokenNode).Data), 32)
if math.Abs(d-1.0) < epsilon {
fun.Name.Data = []byte("rgb")
fun.Args = fun.Args[:len(fun.Args)-1]
name = css.Rgb
}
}
if name == css.Rgb && len(fun.Args) == 3 {
var err error
rgb := make([]byte, 3)
for j := 0; j < 3; j++ {
val := fun.Args[j].Vals[0].(*css.TokenNode)
if val.TokenType == css.NumberToken {
var d int64
d, err = strconv.ParseInt(string(val.Data), 10, 32)
if d < 0 {
d = 0
} else if d > 255 {
d = 255
}
rgb[j] = byte(d)
} else if val.TokenType == css.PercentageToken {
var d float64
d, err = strconv.ParseFloat(string(val.Data[:len(val.Data)-1]), 32)
if d < 0.0 {
d = 0.0
} else if d > 100.0 {
d = 100.0
}
rgb[j] = byte((d / 100.0 * 255.0) + 0.5)
} else {
err = errors.New("")
break
}
}
if err == nil {
valHex := make([]byte, 6)
hex.Encode(valHex, rgb)
parse.ToLower(valHex)
val := append([]byte("#"), valHex...)
if s, ok := shortenColorHex[string(val)]; ok {
node = &css.TokenNode{css.IdentToken, s}
} else if len(val) == 7 && val[1] == val[2] && val[3] == val[4] && val[5] == val[6] {
node = &css.TokenNode{css.HashToken, append([]byte("#"), val[1], val[3], val[5])}
} else {
node = &css.TokenNode{css.HashToken, val}
}
}
}
}
return node
}
func (c *cssMinifier) shortenToken(t *css.TokenNode) {
if t.TokenType == css.NumberToken || t.TokenType == css.DimensionToken || t.TokenType == css.PercentageToken {
if len(t.Data) > 0 && t.Data[0] == '+' {
t.Data = t.Data[1:]
}
num, dim := css.SplitNumberToken(t.Data)
f, err := strconv.ParseFloat(string(num), 64)
if err != nil {
return
}
if math.Abs(f) < epsilon {
t.Data = []byte("0")
} else if len(num) > 0 {
if num[0] == '-' {
num = num[1:]
// trim 0 left
for len(num) > 0 && num[0] == '0' {
num = num[1:]
}
num = append([]byte{'-'}, num...)
} else {
// trim 0 left
for len(num) > 0 && num[0] == '0' {
num = num[1:]
}
}
// trim 0 right
for i, digit := range num {
if digit == '.' {
j := len(num) - 1
for ; j > i; j-- {
if num[j] == '0' {
num = num[:len(num)-1]
} else {
break
}
}
if j == i {
num = num[:len(num)-1] // remove .
}
break
}
}
if len(dim) > 1 { // only percentage is length 1
parse.ToLower(dim)
}
t.Data = append(num, dim...)
}
} else if t.TokenType == css.IdentToken {
parse.ToLower(t.Data)
if hash, ok := shortenColorName[css.ToHash(t.Data)]; ok {
t.TokenType = css.HashToken
t.Data = hash
}
} else if t.TokenType == css.HashToken {
parse.ToLower(t.Data)
if ident, ok := shortenColorHex[string(t.Data)]; ok {
t.TokenType = css.IdentToken
t.Data = ident
} else if len(t.Data) == 7 && t.Data[1] == t.Data[2] && t.Data[3] == t.Data[4] && t.Data[5] == t.Data[6] {
t.TokenType = css.HashToken
t.Data = append([]byte("#"), append([]byte{t.Data[1]}, t.Data[3], t.Data[5])...)
}
} else if t.TokenType == css.StringToken {
// remove any \\\r\n \\\r \\\n
for i := 1; i < len(t.Data)-2; i++ {
if t.Data[i] == '\\' && (t.Data[i+1] == '\n' || t.Data[i+1] == '\r') {
// encountered first replacee, now start to move bytes to the front
j := i + 2
if t.Data[i+1] == '\r' && len(t.Data) > i+2 && t.Data[i+2] == '\n' {
j++
}
for ; j < len(t.Data); j++ {
if t.Data[j] == '\\' && len(t.Data) > j+1 && (t.Data[j+1] == '\n' || t.Data[j+1] == '\r') {
if t.Data[j+1] == '\r' && len(t.Data) > j+2 && t.Data[j+2] == '\n' {
j++
}
j++
} else {
t.Data[i] = t.Data[j]
i++
}
}
t.Data = t.Data[:i]
break
}
}
} else if t.TokenType == css.URLToken {
t.Data = append([]byte("url"), t.Data[3:]...)
if mediatype, originalData, ok := css.SplitDataURI(t.Data); ok {
data, _ := minify.Bytes(c.m, string(mediatype), originalData)
base64Len := len(";base64") + base64.StdEncoding.EncodedLen(len(data))
asciiLen := len(data)
for _, c := range data {
if 'A' <= c && c <= 'Z' || 'a' <= c && c <= 'z' || '0' <= c && c <= '9' || c == '-' || c == '_' || c == '.' || c == '~' || c == ' ' {
asciiLen++
} else {
asciiLen += 2
}
if asciiLen > base64Len {
break
}
}
if asciiLen > base64Len {
encoded := make([]byte, base64Len-len(";base64"))
base64.StdEncoding.Encode(encoded, data)
data = encoded
mediatype = append(mediatype, []byte(";base64")...)
} else {
data = []byte(url.QueryEscape(string(data)))
data = bytes.Replace(data, []byte("\""), []byte("\\\""), -1)
}
if len(mediatype) >= len("text/plain") && bytes.HasPrefix(mediatype, []byte("text/plain")) {
mediatype = mediatype[len("text/plain"):]
}
t.Data = append(append(append(append([]byte("url(\"data:"), mediatype...), ','), data...), []byte("\")")...)
}
s := t.Data[4 : len(t.Data)-1]
if len(s) > 2 && (s[0] == '"' || s[0] == '\'') && css.IsUrlUnquoted([]byte(s[1:len(s)-1])) {
t.Data = append(append([]byte("url("), s[1:len(s)-1]...), ')')
}
}
}