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authorDomino Goupil <[email protected]>2023-10-18 17:46:36 -0400
committerBjørn Erik Pedersen <[email protected]>2023-10-29 18:37:05 +0100
commit9dc608084b73f04c146351cbe8d1b2f41058e8ba (patch)
tree0095f40af206f5bb3dbf26226f6b6a41f2085bb8 /transform
parenta349aafb7fa2e013926b75154b48dec79416eef7 (diff)
downloadhugo-9dc608084b73f04c146351cbe8d1b2f41058e8ba.tar.gz
hugo-9dc608084b73f04c146351cbe8d1b2f41058e8ba.zip
livereloadinject: Use more robust injection method
Diffstat (limited to 'transform')
-rw-r--r--transform/livereloadinject/livereloadinject.go65
-rw-r--r--transform/livereloadinject/livereloadinject_test.go76
2 files changed, 80 insertions, 61 deletions
diff --git a/transform/livereloadinject/livereloadinject.go b/transform/livereloadinject/livereloadinject.go
index a29a64ebb..43c03348d 100644
--- a/transform/livereloadinject/livereloadinject.go
+++ b/transform/livereloadinject/livereloadinject.go
@@ -14,10 +14,10 @@
package livereloadinject
import (
- "bytes"
"fmt"
"html"
"net/url"
+ "regexp"
"strings"
"github.com/gohugoio/hugo/common/loggers"
@@ -25,42 +25,27 @@ import (
"github.com/gohugoio/hugo/transform"
)
-const warnMessage = `"head" or "body" tag is required in html to append livereload script. ` +
- "As a fallback, Hugo injects it somewhere but it might not work properly."
-
-var warnScript = fmt.Sprintf(`<script data-no-instant defer>console.warn('%s');</script>`, warnMessage)
-
-type tag struct {
- markup []byte
- appendScript bool
- warnRequired bool
-}
-
-var tags = []tag{
- {markup: []byte("<head"), appendScript: true},
- {markup: []byte("<HEAD"), appendScript: true},
- {markup: []byte("</body>")},
- {markup: []byte("</BODY>")},
- {markup: []byte("<html"), appendScript: true, warnRequired: true},
- {markup: []byte("<HTML"), appendScript: true, warnRequired: true},
+var ignoredSyntax = regexp.MustCompile(`(?s)^(?:\s+|<!--.*?-->|<\?.*?\?>)*`)
+var tagsBeforeHead = []*regexp.Regexp{
+ regexp.MustCompile(`(?is)^<!doctype\s[^>]*>`),
+ regexp.MustCompile(`(?is)^<html(?:\s[^>]*)?>`),
+ regexp.MustCompile(`(?is)^<head(?:\s[^>]*)?>`),
}
-// New creates a function that can be used
-// to inject a script tag for the livereload JavaScript in a HTML document.
+// New creates a function that can be used to inject a script tag for
+// the livereload JavaScript at the start of an HTML document's head.
func New(baseURL url.URL) transform.Transformer {
return func(ft transform.FromTo) error {
b := ft.From().Bytes()
- idx := -1
- var match tag
- // We used to insert the livereload script right before the closing body.
- // This does not work when combined with tools such as Turbolinks.
- // So we try to inject the script as early as possible.
- for _, t := range tags {
- idx = bytes.Index(b, t.markup)
- if idx != -1 {
- match = t
- break
- }
+
+ // We find the start of the head by reading past (in order)
+ // the doctype declaration, HTML start tag and head start tag,
+ // all of which are optional, and any whitespace, comments, or
+ // XML instructions in-between.
+ idx := 0
+ for _, tag := range tagsBeforeHead {
+ idx += len(ignoredSyntax.Find(b[idx:]))
+ idx += len(tag.Find(b[idx:]))
}
path := strings.TrimSuffix(baseURL.Path, "/")
@@ -72,23 +57,9 @@ func New(baseURL url.URL) transform.Transformer {
c := make([]byte, len(b))
copy(c, b)
- if idx == -1 {
- idx = len(b)
- match = tag{warnRequired: true}
- }
-
script := []byte(fmt.Sprintf(`<script src="%s" data-no-instant defer></script>`, html.EscapeString(src)))
- i := idx
- if match.appendScript {
- i += bytes.Index(b[i:], []byte(">")) + 1
- }
-
- if match.warnRequired {
- script = append(script, []byte(warnScript)...)
- }
-
- c = append(c[:i], append(script, c[i:]...)...)
+ c = append(c[:idx], append(script, c[idx:]...)...)
if _, err := ft.To().Write(c); err != nil {
loggers.Log().Warnf("Failed to inject LiveReload script:", err)
diff --git a/transform/livereloadinject/livereloadinject_test.go b/transform/livereloadinject/livereloadinject_test.go
index cba2d3834..dc8740208 100644
--- a/transform/livereloadinject/livereloadinject_test.go
+++ b/transform/livereloadinject/livereloadinject_test.go
@@ -43,32 +43,80 @@ func TestLiveReloadInject(t *testing.T) {
return out.String()
}
- c.Run("Head lower", func(c *qt.C) {
- c.Assert(apply("<html><head>foo"), qt.Equals, "<html><head>"+expectBase+"foo")
+ c.Run("Inject after head tag", func(c *qt.C) {
+ c.Assert(apply("<!doctype html><html><head>after"), qt.Equals, "<!doctype html><html><head>"+expectBase+"after")
})
- c.Run("Head upper", func(c *qt.C) {
- c.Assert(apply("<html><HEAD>foo"), qt.Equals, "<html><HEAD>"+expectBase+"foo")
+ c.Run("Inject after head tag when doctype and html omitted", func(c *qt.C) {
+ c.Assert(apply("<head>after"), qt.Equals, "<head>"+expectBase+"after")
})
- c.Run("Body lower", func(c *qt.C) {
- c.Assert(apply("foo</body>"), qt.Equals, "foo"+expectBase+"</body>")
+ c.Run("Inject after html when head omitted", func(c *qt.C) {
+ c.Assert(apply("<html>after"), qt.Equals, "<html>"+expectBase+"after")
})
- c.Run("Body upper", func(c *qt.C) {
- c.Assert(apply("foo</BODY>"), qt.Equals, "foo"+expectBase+"</BODY>")
+ c.Run("Inject after doctype when head and html omitted", func(c *qt.C) {
+ c.Assert(apply("<!doctype html>after"), qt.Equals, "<!doctype html>"+expectBase+"after")
})
- c.Run("Html upper", func(c *qt.C) {
- c.Assert(apply("<html>foo"), qt.Equals, "<html>"+expectBase+warnScript+"foo")
+ c.Run("Inject before other elements if all else omitted", func(c *qt.C) {
+ c.Assert(apply("<title>after</title>"), qt.Equals, expectBase+"<title>after</title>")
})
- c.Run("Html upper with attr", func(c *qt.C) {
- c.Assert(apply(`<html lang="en">foo`), qt.Equals, `<html lang="en">`+expectBase+warnScript+"foo")
+ c.Run("Inject before text content if all else omitted", func(c *qt.C) {
+ c.Assert(apply("after"), qt.Equals, expectBase+"after")
})
- c.Run("No match", func(c *qt.C) {
- c.Assert(apply("<h1>No match</h1>"), qt.Equals, "<h1>No match</h1>"+expectBase+warnScript)
+ c.Run("Inject after HeAd tag MiXed CaSe", func(c *qt.C) {
+ c.Assert(apply("<HeAd>AfTer"), qt.Equals, "<HeAd>"+expectBase+"AfTer")
+ })
+
+ c.Run("Inject after HtMl tag MiXed CaSe", func(c *qt.C) {
+ c.Assert(apply("<HtMl>AfTer"), qt.Equals, "<HtMl>"+expectBase+"AfTer")
+ })
+
+ c.Run("Inject after doctype mixed case", func(c *qt.C) {
+ c.Assert(apply("<!DocType HtMl>AfTer"), qt.Equals, "<!DocType HtMl>"+expectBase+"AfTer")
+ })
+
+ c.Run("Inject after html tag with attributes", func(c *qt.C) {
+ c.Assert(apply(`<html lang="en">after`), qt.Equals, `<html lang="en">`+expectBase+"after")
+ })
+
+ c.Run("Inject after html tag with newline", func(c *qt.C) {
+ c.Assert(apply("<html\n>after"), qt.Equals, "<html\n>"+expectBase+"after")
+ })
+
+ c.Run("Skip comments and whitespace", func(c *qt.C) {
+ c.Assert(
+ apply(" <!--x--> <!doctype html>\n<?xml instruction ?> <head>after"),
+ qt.Equals,
+ " <!--x--> <!doctype html>\n<?xml instruction ?> <head>"+expectBase+"after",
+ )
+ })
+
+ c.Run("Do not search inside comment", func(c *qt.C) {
+ c.Assert(apply("<html><!--<head>-->"), qt.Equals, "<html><!--<head>-->"+expectBase)
+ })
+
+ c.Run("Do not search inside scripts", func(c *qt.C) {
+ c.Assert(apply("<html><script>`<head>`</script>"), qt.Equals, "<html>"+expectBase+"<script>`<head>`</script>")
+ })
+
+ c.Run("Do not search inside templates", func(c *qt.C) {
+ c.Assert(apply("<html><template><head></template>"), qt.Not(qt.Equals), "<html><template><head>"+expectBase+"</template>")
+ })
+
+ c.Run("Search from the start of the input", func(c *qt.C) {
+ c.Assert(apply("<head>after<head>"), qt.Equals, "<head>"+expectBase+"after<head>")
+ })
+
+ c.Run("Do not mistake header for head", func(c *qt.C) {
+ c.Assert(apply("<html><header>"), qt.Equals, "<html>"+expectBase+"<header>")
+ })
+
+ c.Run("Do not mistake custom elements for head", func(c *qt.C) {
+ c.Assert(apply("<html><head-custom>"), qt.Equals, "<html>"+expectBase+"<head-custom>")
})
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-26 03:00:27 +0000