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831 lines (821 loc) · 14.3 KB
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package css
import (
"bytes"
"errors"
"fmt"
"reflect"
"strings"
"testing"
"github.com/google/go-cmp/cmp"
"golang.org/x/net/html"
)
func (s *Selector) String() string {
var b strings.Builder
formatValue(reflect.ValueOf(s), &b, "")
return b.String()
}
func formatValue(v reflect.Value, b *strings.Builder, ident string) {
switch v.Kind() {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
fmt.Fprintf(b, "%d", v.Int())
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
fmt.Fprintf(b, "%d", v.Uint())
case reflect.Float32, reflect.Float64:
fmt.Fprintf(b, "%f", v.Float())
case reflect.Bool:
fmt.Fprintf(b, "%t", v.Bool())
case reflect.Array, reflect.Slice:
if v.IsNil() {
b.WriteString("[]")
return
}
fmt.Fprintf(b, "[\n")
for i := 0; i < v.Len(); i++ {
b.WriteString(ident)
b.WriteString("\t")
formatValue(v.Index(i), b, ident+"\t")
fmt.Fprintf(b, ",\n")
}
b.WriteString(ident)
b.WriteString("]")
case reflect.Func:
if v.IsNil() {
b.WriteString("<nil>")
return
}
fmt.Fprintf(b, "<func()>")
case reflect.Interface:
if v.IsNil() {
b.WriteString("<nil>")
return
}
formatValue(v.Elem(), b, ident)
case reflect.Map:
if v.IsNil() {
b.WriteString("<nil>")
return
}
iter := v.MapRange()
fmt.Fprintf(b, "{\n")
for iter.Next() {
b.WriteString(ident)
formatValue(iter.Key(), b, ident+"\n")
fmt.Fprintf(b, ", ")
formatValue(iter.Value(), b, ident)
}
fmt.Fprintf(b, "}")
case reflect.Ptr:
if v.IsNil() {
b.WriteString("<nil>")
return
}
fmt.Fprintf(b, "*")
formatValue(reflect.Indirect(v), b, ident)
case reflect.String:
fmt.Fprintf(b, "%q", v.String())
case reflect.Struct:
t := v.Type()
fmt.Fprintf(b, "%s{\n", t.Name())
for i := 0; i < v.NumField(); i++ {
b.WriteString(ident + "\t")
b.WriteString(t.Field(i).Name)
b.WriteString(": ")
formatValue(v.Field(i), b, ident+"\t")
b.WriteString(",\n")
}
b.WriteString(ident)
b.WriteString("}")
}
}
type selectorTest struct {
sel string
in string
want []string
}
var selectorTests = []selectorTest{
{
"a",
`<h1><a></a></h1>`,
[]string{`<a></a>`},
},
{
"body",
`<h1><a></a></h1>`,
[]string{`<body><h1><a></a></h1></body>`},
},
{
"body *",
`<h1><a></a></h1>`,
[]string{`<h1><a></a></h1>`, `<a></a>`},
},
{
"body > *",
`<h1><a></a></h1>`,
[]string{`<h1><a></a></h1>`},
},
{
"div",
`<h1><div><div></div></div></h1>`,
[]string{
`<div><div></div></div>`,
`<div></div>`,
},
},
{
"div",
`<h1><div></div><div></div></h1>`,
[]string{`<div></div>`, `<div></div>`},
},
{
".foo",
`<h1><h2 class="foo"></h2><div class="foo"></div><div id="foo"></div></h1>`,
[]string{
`<h2 class="foo"></h2>`,
`<div class="foo"></div>`,
},
},
{
".foo",
`<h1><h2 class="foo bar"></h2><div class="bar foo"></div><div id="foo"></div></h1>`,
[]string{
`<h2 class="foo bar"></h2>`,
`<div class="bar foo"></div>`,
},
},
{
"div.foo",
`<h1><h2 class="foo"></h2><div class="foo"></div><div id="foo"></div></h1>`,
[]string{`<div class="foo"></div>`},
},
{
"#foo",
`<h1><h2 class="foo"></h2><div class="foo"></div><div id="foo"></div></h1>`,
[]string{`<div id="foo"></div>`},
},
{
"div#foo",
`<h1><h2 class="foo"></h2><div class="foo"></div><div id="foo"></div></h1>`,
[]string{`<div id="foo"></div>`},
},
{
"a",
`<div><svg xmlns="http://www.w3.org/2000/svg"><a class="foo"></a></svg></div>`,
[]string{`<a class="foo"></a>`},
},
{
"*|a",
`<div><svg xmlns="http://www.w3.org/2000/svg"><a class="foo"></a></svg></div>`,
[]string{`<a class="foo"></a>`},
},
{
"svg|a",
`<div><svg xmlns="http://www.w3.org/2000/svg"><a class="foo"></a></svg></div>`,
[]string{`<a class="foo"></a>`},
},
{
"|a",
`<div><svg xmlns="http://www.w3.org/2000/svg"><a class="foo"></a></svg></div>`,
[]string{},
},
{
"other|a",
`<div><svg xmlns="http://www.w3.org/2000/svg"><a class="foo"></a></svg></div>`,
[]string{},
},
{
"svg|*",
`<div><svg xmlns="http://www.w3.org/2000/svg"><a class="foo"></a></svg></div>`,
[]string{
`<svg xmlns="http://www.w3.org/2000/svg"><a class="foo"></a></svg>`,
`<a class="foo"></a>`,
},
},
{
"div[class=foo]",
`<h1><h2 class="foo"></h2><div class="foo"></div><div id="foo"></div></h1>`,
[]string{
`<div class="foo"></div>`,
},
},
{
"div[class*=o]",
`<h1><h2 class="foo"></h2><div class="foo"></div><div id="foo"></div></h1>`,
[]string{
`<div class="foo"></div>`,
},
},
{
"div[class~=foo]",
`<h1><h2 class="foo"></h2><div class="bar foo"></div><div id="foo"></div></h1>`,
[]string{
`<div class="bar foo"></div>`,
},
},
{
"div[class|=foo]",
`<h1><div class="foo bar"></div><div class="foo"></div><div class="foo-bar"></div></h1>`,
[]string{
`<div class="foo"></div>`,
`<div class="foo-bar"></div>`,
},
},
{
"div[class^=foo]",
`<h1><div class="bar foo"></div><div class="foo"></div><div class="foo-bar"></div></h1>`,
[]string{
`<div class="foo"></div>`,
`<div class="foo-bar"></div>`,
},
},
{
"div[class$=foo]",
`<h1><div class="bar foo"></div><div class="foo"></div><div class="foo-bar"></div></h1>`,
[]string{
`<div class="bar foo"></div>`,
`<div class="foo"></div>`,
},
},
{
"div[class]",
`<h1><div class="bar foo"></div><div class="foo"></div><div class="foo-bar"></div></h1>`,
[]string{
`<div class="bar foo"></div>`,
`<div class="foo"></div>`,
`<div class="foo-bar"></div>`,
},
},
{
"div[class^=foO i]",
`<h1><div class="bar foo"></div><div class="fOo"></div><div class="Foo-bar"></div></h1>`,
[]string{
`<div class="fOo"></div>`,
`<div class="Foo-bar"></div>`,
},
},
{
"div a",
`
<h1>
<div>
<a href="http://bar"></a>
</div>
<div>
<div>
<a href="http://foo"></a>
</div>
</div>
<a href="http://spam"></a>
</h1>
`,
[]string{
`<a href="http://bar"></a>`,
`<a href="http://foo"></a>`,
`<a href="http://foo"></a>`,
},
},
{
"div > a",
`
<h1>
<div>
<a href="http://bar"></a>
</div>
<div>
<div>
<a href="http://foo"></a>
</div>
</div>
<a href="http://spam"></a>
</h1>
`,
[]string{
`<a href="http://bar"></a>`,
`<a href="http://foo"></a>`,
},
},
{
"div + a",
`
<h1>
<div>
<a href="http://bar"></a>
</div>
<a href="http://spam"></a>
<p></p>
<a href="http://foo"></a>
</h1>
`,
[]string{
`<a href="http://spam"></a>`,
},
},
{
"div ~ a",
`
<h1>
<div>
<a href="http://bar"></a>
</div>
<a href="http://spam"></a>
<p></p>
<a href="http://foo"></a>
</h1>
`,
[]string{
`<a href="http://spam"></a>`,
`<a href="http://foo"></a>`,
},
},
{
"body p em", // https://github.com/ericchiang/css/issues/7
`
<html>
<body>
<p>
<em></em>
</p>
</body>
</html>
`,
[]string{"<em></em>"},
},
{
"div:empty",
`
<div class="foo"><p></p></div>
<div class="bar"> </div>
`,
[]string{`<div class="bar"> </div>`},
},
{
":root",
`<html><head></head><body></body></html>`,
[]string{`<html><head></head><body></body></html>`},
},
{
"div:first-child",
`
<p></p>
<div>
<div class="foo"><p></p></div>
<div class="bar"><div class="spam"></div></div>
</div>
<p></p>
`,
[]string{
`<div class="foo"><p></p></div>`,
`<div class="spam"></div>`,
},
},
{
"div:last-child",
`
<p></p>
<div>
<div class="foo"><p></p></div>
<div class="bar"><div class="spam"></div></div>
</div>
<p></p>
`,
[]string{
`<div class="bar"><div class="spam"></div></div>`,
`<div class="spam"></div>`,
},
},
{
"div:only-child",
`
<p></p>
<div>
<div class="foo"><p></p></div>
<div class="bar"><div class="spam"></div></div>
</div>
<p></p>
`,
[]string{
`<div class="spam"></div>`,
},
},
{
".test:first-of-type",
`
<p></p>
<div>
<p class="test" id="foo"></p>
<div class="test" id="foo"></div>
<div class="test" id="bar"></div>
<p class="test" id="bar"></p>
<h1 class="test" id="bar"></h1>
</div>
<p></p>
`,
[]string{
`<p class="test" id="foo"></p>`,
`<div class="test" id="foo"></div>`,
`<h1 class="test" id="bar"></h1>`,
},
},
{
".test:last-of-type",
`
<p></p>
<div>
<p class="test" id="foo"></p>
<div class="test" id="foo"></div>
<div class="test" id="bar"></div>
<p class="test" id="bar"></p>
<h1 class="test" id="bar"></h1>
</div>
<p></p>
`,
[]string{
`<div class="test" id="bar"></div>`,
`<p class="test" id="bar"></p>`,
`<h1 class="test" id="bar"></h1>`,
},
},
{
".test:only-of-type",
`
<p></p>
<div>
<p class="test" id="foo"></p>
<div class="test" id="foo"></div>
<div class="test" id="bar"></div>
<p class="test" id="bar"></p>
<h1 class="test" id="bar"></h1>
</div>
<p></p>
`,
[]string{
`<h1 class="test" id="bar"></h1>`,
},
},
{
"li:nth-child(2)",
`
<ul>
<li>1</li>
<li>2</li>
<li>3</li>
<li>4</li>
<li>5</li>
<li>6</li>
<li>7</li>
<li>8</li>
</ul>
`,
[]string{
`<li>2</li>`,
},
},
{
"li:nth-child(1n+2)",
`
<ul>
<li>1</li>
<li>2</li>
<li>3</li>
<li>4</li>
<li>5</li>
<li>6</li>
<li>7</li>
<li>8</li>
</ul>
`,
[]string{
`<li>2</li>`,
`<li>3</li>`,
`<li>4</li>`,
`<li>5</li>`,
`<li>6</li>`,
`<li>7</li>`,
`<li>8</li>`,
},
},
{
"li:nth-child(3n)",
`
<ul>
<li>1</li>
<li>2</li>
<li>3</li>
<li>4</li>
<li>5</li>
<li>6</li>
<li>7</li>
<li>8</li>
</ul>
`,
[]string{
`<li>3</li>`,
`<li>6</li>`,
},
},
{
"li:nth-child(3n+2)",
`
<ul>
<li>1</li>
<li>2</li>
<li>3</li>
<li>4</li>
<li>5</li>
<li>6</li>
<li>7</li>
<li>8</li>
</ul>
`,
[]string{
`<li>2</li>`,
`<li>5</li>`,
`<li>8</li>`,
},
},
{
"li:nth-child(3n+ 2)",
`
<ul>
<li>1</li>
<li>2</li>
<li>3</li>
<li>4</li>
<li>5</li>
<li>6</li>
<li>7</li>
<li>8</li>
</ul>
`,
[]string{
`<li>2</li>`,
`<li>5</li>`,
`<li>8</li>`,
},
},
{
"li:nth-child(3n - 2)",
`
<ul>
<li>1</li>
<li>2</li>
<li>3</li>
<li>4</li>
<li>5</li>
<li>6</li>
<li>7</li>
<li>8</li>
</ul>
`,
[]string{
`<li>1</li>`,
`<li>4</li>`,
`<li>7</li>`,
},
},
{
"li:nth-child(even)",
`
<ul>
<li>1</li>
<li>2</li>
<li>3</li>
<li>4</li>
<li>5</li>
<li>6</li>
<li>7</li>
<li>8</li>
</ul>
`,
[]string{
`<li>2</li>`,
`<li>4</li>`,
`<li>6</li>`,
`<li>8</li>`,
},
},
{
"li:nth-child(odd)",
`
<ul>
<li>1</li>
<li>2</li>
<li>3</li>
<li>4</li>
<li>5</li>
<li>6</li>
<li>7</li>
<li>8</li>
</ul>
`,
[]string{
`<li>1</li>`,
`<li>3</li>`,
`<li>5</li>`,
`<li>7</li>`,
},
},
{
"li:nth-last-child(2)",
`
<ul>
<li>1</li>
<li>2</li>
<li>3</li>
<li>4</li>
<li>5</li>
<li>6</li>
<li>7</li>
<li>8</li>
</ul>
`,
[]string{
`<li>7</li>`,
},
},
{
"li:nth-last-child(1n+2)",
`
<ul>
<li>1</li>
<li>2</li>
<li>3</li>
<li>4</li>
<li>5</li>
<li>6</li>
<li>7</li>
<li>8</li>
</ul>
`,
[]string{
`<li>1</li>`,
`<li>2</li>`,
`<li>3</li>`,
`<li>4</li>`,
`<li>5</li>`,
`<li>6</li>`,
`<li>7</li>`,
},
},
{
"li:nth-last-child(3n)",
`
<ul>
<li>1</li>
<li>2</li>
<li>3</li>
<li>4</li>
<li>5</li>
<li>6</li>
<li>7</li>
<li>8</li>
</ul>
`,
[]string{
`<li>3</li>`,
`<li>6</li>`,
},
},
{
"li:nth-last-child(3n+2)",
`
<ul>
<li>1</li>
<li>2</li>
<li>3</li>
<li>4</li>
<li>5</li>
<li>6</li>
<li>7</li>
<li>8</li>
</ul>
`,
[]string{
`<li>1</li>`,
`<li>4</li>`,
`<li>7</li>`,
},
},
{
"li:nth-last-child(3n+2)",
`
<ul>
<li>1</li>
<li>2</li>
<li>3</li>
<li>4</li>
<li>5</li>
<li>6</li>
<li>7</li>
<li>8</li>
</ul>
`,
[]string{
`<li>1</li>`,
`<li>4</li>`,
`<li>7</li>`,
},
},
{
"ul :nth-of-type(3n+2)",
`
<ul>
<p></p>
<li>1</li>
<p></p>
<li>2</li>
<li>3</li>
<li>4</li>
<li>5</li>
<li>6</li>
<li>7</li>
<li>8</li>
</ul>
`,
[]string{
`<p></p>`,
`<li>2</li>`,
`<li>5</li>`,
`<li>8</li>`,
},
},
{
"ul :nth-last-of-type(3n+2)",
`
<ul>
<p></p>
<li>1</li>
<p></p>
<li>2</li>
<li>3</li>
<li>4</li>
<li>5</li>
<li>6</li>
<li>7</li>
<li>8</li>
</ul>
`,
[]string{
`<p></p>`,
`<li>1</li>`,
`<li>4</li>`,
`<li>7</li>`,
},
},
}
func TestSelector(t *testing.T) {
for _, test := range selectorTests {
s, err := Parse(test.sel)
if err != nil {
t.Errorf("Parse(%q) failed %v", test.sel, err)
continue
}
root, err := html.Parse(strings.NewReader(test.in))
if err != nil {
t.Errorf("html.Parse(%q) failed %v", test.in, err)
continue
}
// Re-render test case in case the parser is interpeting it differently than
// we expect.
b := &bytes.Buffer{}
if err := html.Render(b, root); err != nil {
t.Errorf("Re-rendering input %s: %v", test.in, err)
continue
}
in := b.String()
got := []string{}
for _, n := range s.Select(root) {
b := &bytes.Buffer{}
if err := html.Render(b, n); err != nil {
t.Errorf("Failed to render result of selecting %q from %s: %v", test.sel, in, err)
continue
}
got = append(got, b.String())
}
if diff := cmp.Diff(test.want, got); diff != "" {
t.Errorf("Selecting %q (%s) from %s returned diff (-want, +got): %s", test.sel, s, in, diff)
}
}
}
func TestBadSelector(t *testing.T) {
tests := []struct {
sel string
pos int
}{
{":nth-child(3+4n)", 0},
}
for _, test := range tests {
_, err := Parse(test.sel)
if err == nil {
t.Errorf("Expected parsing %s to return error", test.sel)
continue
}
var perr *ParseError
if !errors.As(err, &perr) {
t.Errorf("Expected parsing %s to return error of type *ParseError, got %T: %v", test.sel, err, err)
continue
}
if test.pos != perr.Pos {
t.Errorf("Parsing %s returned unexpected position, got=%d, want=%d", test.sel, perr.Pos, test.pos)
}
}
}