update chroma to v0.8.0 (#12337)

16 files changed, 464 insertions, 93 deletions

diff --git a/vendor/github.com/alecthomas/chroma/.golangci.yml b/vendor/github.com/alecthomas/chroma/.golangci.yml
index b1e51f3939..9a735377a2 100644
--- a/vendor/github.com/alecthomas/chroma/.golangci.yml
+++ b/vendor/github.com/alecthomas/chroma/.golangci.yml
@@ -20,6 +20,11 @@ linters:
     - wsl
     - gomnd
     - gocognit
+    - goerr113
+    - nolintlint
+    - testpackage
+    - godot
+    - nestif
 
 linters-settings:
   govet:
diff --git a/vendor/github.com/alecthomas/chroma/.travis.yml b/vendor/github.com/alecthomas/chroma/.travis.yml
index 9216ec9743..4850b0c804 100644
--- a/vendor/github.com/alecthomas/chroma/.travis.yml
+++ b/vendor/github.com/alecthomas/chroma/.travis.yml
@@ -4,7 +4,7 @@ go:
   - "1.13.x"
 script:
   - go test -v ./...
-  - curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | bash -s v1.22.2
+  - curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | bash -s v1.26.0
   - ./bin/golangci-lint run
   - git clean -fdx .
 after_success:
diff --git a/vendor/github.com/alecthomas/chroma/lexers/b/bash.go b/vendor/github.com/alecthomas/chroma/lexers/b/bash.go
index 38b3f22491..33f6cd8b8d 100644
--- a/vendor/github.com/alecthomas/chroma/lexers/b/bash.go
+++ b/vendor/github.com/alecthomas/chroma/lexers/b/bash.go
@@ -36,7 +36,7 @@ var Bash = internal.Register(MustNewLexer(
 			{`\b(if|fi|else|while|do|done|for|then|return|function|case|select|continue|until|esac|elif)(\s*)\b`, ByGroups(Keyword, Text), nil},
 			{"\\b(alias|bg|bind|break|builtin|caller|cd|command|compgen|complete|declare|dirs|disown|echo|enable|eval|exec|exit|export|false|fc|fg|getopts|hash|help|history|jobs|kill|let|local|logout|popd|printf|pushd|pwd|read|readonly|set|shift|shopt|source|suspend|test|time|times|trap|true|type|typeset|ulimit|umask|unalias|unset|wait)(?=[\\s)`])", NameBuiltin, nil},
 			{`\A#!.+\n`, CommentPreproc, nil},
-			{`#.*\S`, CommentSingle, nil},
+			{`#.*(\S|$)`, CommentSingle, nil},
 			{`\\[\w\W]`, LiteralStringEscape, nil},
 			{`(\b\w+)(\s*)(\+?=)`, ByGroups(NameVariable, Text, Operator), nil},
 			{`[\[\]{}()=]`, Operator, nil},
diff --git a/vendor/github.com/alecthomas/chroma/lexers/c/caddyfile.go b/vendor/github.com/alecthomas/chroma/lexers/c/caddyfile.go
new file mode 100644
index 0000000000..219c90fcac
--- /dev/null
+++ b/vendor/github.com/alecthomas/chroma/lexers/c/caddyfile.go
@@ -0,0 +1,206 @@
+package c
+
+import (
+	. "github.com/alecthomas/chroma" // nolint
+	"github.com/alecthomas/chroma/lexers/internal"
+)
+
+// caddyfileCommon are the rules common to both of the lexer variants
+var caddyfileCommon = Rules{
+	"site_block_common": {
+		// Import keyword
+		{`(import)(\s+)([^\s]+)`, ByGroups(Keyword, Text, NameVariableMagic), nil},
+		// Matcher definition
+		{`@[^\s]+(?=\s)`, NameDecorator, Push("matcher")},
+		// Matcher token stub for docs
+		{`\[\<matcher\>\]`, NameDecorator, Push("matcher")},
+		// These cannot have matchers but may have things that look like
+		// matchers in their arguments, so we just parse as a subdirective.
+		{`try_files`, Keyword, Push("subdirective")},
+		// These are special, they can nest more directives
+		{`handle_errors|handle|route|handle_path|not`, Keyword, Push("nested_directive")},
+		// Any other directive
+		{`[^\s#]+`, Keyword, Push("directive")},
+		Include("base"),
+	},
+	"matcher": {
+		{`\{`, Punctuation, Push("block")},
+		// Not can be one-liner
+		{`not`, Keyword, Push("deep_not_matcher")},
+		// Any other same-line matcher
+		{`[^\s#]+`, Keyword, Push("arguments")},
+		// Terminators
+		{`\n`, Text, Pop(1)},
+		{`\}`, Punctuation, Pop(1)},
+		Include("base"),
+	},
+	"block": {
+		{`\}`, Punctuation, Pop(2)},
+		// Not can be one-liner
+		{`not`, Keyword, Push("not_matcher")},
+		// Any other subdirective
+		{`[^\s#]+`, Keyword, Push("subdirective")},
+		Include("base"),
+	},
+	"nested_block": {
+		{`\}`, Punctuation, Pop(2)},
+		// Matcher definition
+		{`@[^\s]+(?=\s)`, NameDecorator, Push("matcher")},
+		// Something that starts with literally < is probably a docs stub
+		{`\<[^#]+\>`, Keyword, Push("nested_directive")},
+		// Any other directive
+		{`[^\s#]+`, Keyword, Push("nested_directive")},
+		Include("base"),
+	},
+	"not_matcher": {
+		{`\}`, Punctuation, Pop(2)},
+		{`\{(?=\s)`, Punctuation, Push("block")},
+		{`[^\s#]+`, Keyword, Push("arguments")},
+		{`\s+`, Text, nil},
+	},
+	"deep_not_matcher": {
+		{`\}`, Punctuation, Pop(2)},
+		{`\{(?=\s)`, Punctuation, Push("block")},
+		{`[^\s#]+`, Keyword, Push("deep_subdirective")},
+		{`\s+`, Text, nil},
+	},
+	"directive": {
+		{`\{(?=\s)`, Punctuation, Push("block")},
+		Include("matcher_token"),
+		Include("comments_pop_1"),
+		{`\n`, Text, Pop(1)},
+		Include("base"),
+	},
+	"nested_directive": {
+		{`\{(?=\s)`, Punctuation, Push("nested_block")},
+		Include("matcher_token"),
+		Include("comments_pop_1"),
+		{`\n`, Text, Pop(1)},
+		Include("base"),
+	},
+	"subdirective": {
+		{`\{(?=\s)`, Punctuation, Push("block")},
+		Include("comments_pop_1"),
+		{`\n`, Text, Pop(1)},
+		Include("base"),
+	},
+	"arguments": {
+		{`\{(?=\s)`, Punctuation, Push("block")},
+		Include("comments_pop_2"),
+		{`\\\n`, Text, nil}, // Skip escaped newlines
+		{`\n`, Text, Pop(2)},
+		Include("base"),
+	},
+	"deep_subdirective": {
+		{`\{(?=\s)`, Punctuation, Push("block")},
+		Include("comments_pop_3"),
+		{`\n`, Text, Pop(3)},
+		Include("base"),
+	},
+	"matcher_token": {
+		{`@[^\s]+`, NameDecorator, Push("arguments")},         // Named matcher
+		{`/[^\s]+`, NameDecorator, Push("arguments")},         // Path matcher
+		{`\*`, NameDecorator, Push("arguments")},              // Wildcard path matcher
+		{`\[\<matcher\>\]`, NameDecorator, Push("arguments")}, // Matcher token stub for docs
+	},
+	"comments": {
+		{`^#.*\n`, CommentSingle, nil},   // Comment at start of line
+		{`\s+#.*\n`, CommentSingle, nil}, // Comment preceded by whitespace
+	},
+	"comments_pop_1": {
+		{`^#.*\n`, CommentSingle, Pop(1)},   // Comment at start of line
+		{`\s+#.*\n`, CommentSingle, Pop(1)}, // Comment preceded by whitespace
+	},
+	"comments_pop_2": {
+		{`^#.*\n`, CommentSingle, Pop(2)},   // Comment at start of line
+		{`\s+#.*\n`, CommentSingle, Pop(2)}, // Comment preceded by whitespace
+	},
+	"comments_pop_3": {
+		{`^#.*\n`, CommentSingle, Pop(3)},   // Comment at start of line
+		{`\s+#.*\n`, CommentSingle, Pop(3)}, // Comment preceded by whitespace
+	},
+	"base": {
+		Include("comments"),
+		{`(on|off|first|last|before|after|internal|strip_prefix|strip_suffix|replace)\b`, NameConstant, nil},
+		{`(https?://)?([a-z0-9.-]+)(:)([0-9]+)`, ByGroups(Name, Name, Punctuation, LiteralNumberInteger), nil},
+		{`[a-z-]+/[a-z-+]+`, LiteralString, nil},
+		{`[0-9]+[km]?\b`, LiteralNumberInteger, nil},
+		{`\{[\w+.\$-]+\}`, LiteralStringEscape, nil}, // Placeholder
+		{`\[(?=[^#{}$]+\])`, Punctuation, nil},
+		{`\]|\|`, Punctuation, nil},
+		{`[^\s#{}$\]]+`, LiteralString, nil},
+		{`/[^\s#]*`, Name, nil},
+		{`\s+`, Text, nil},
+	},
+}
+
+// Caddyfile lexer.
+var Caddyfile = internal.Register(MustNewLexer(
+	&Config{
+		Name:      "Caddyfile",
+		Aliases:   []string{"caddyfile", "caddy"},
+		Filenames: []string{"Caddyfile*"},
+		MimeTypes: []string{},
+	},
+	Rules{
+		"root": {
+			Include("comments"),
+			// Global options block
+			{`^\s*(\{)\s*$`, ByGroups(Punctuation), Push("globals")},
+			// Snippets
+			{`(\([^\s#]+\))(\s*)(\{)`, ByGroups(NameVariableAnonymous, Text, Punctuation), Push("snippet")},
+			// Site label
+			{`[^#{(\s,]+`, GenericHeading, Push("label")},
+			// Site label with placeholder
+			{`\{[\w+.\$-]+\}`, LiteralStringEscape, Push("label")},
+			{`\s+`, Text, nil},
+		},
+		"globals": {
+			{`\}`, Punctuation, Pop(1)},
+			{`[^\s#]+`, Keyword, Push("directive")},
+			Include("base"),
+		},
+		"snippet": {
+			{`\}`, Punctuation, Pop(1)},
+			// Matcher definition
+			{`@[^\s]+(?=\s)`, NameDecorator, Push("matcher")},
+			// Any directive
+			{`[^\s#]+`, Keyword, Push("directive")},
+			Include("base"),
+		},
+		"label": {
+			// Allow multiple labels, comma separated, newlines after
+			// a comma means another label is coming
+			{`,\s*\n?`, Text, nil},
+			{` `, Text, nil},
+			// Site label with placeholder
+			{`\{[\w+.\$-]+\}`, LiteralStringEscape, nil},
+			// Site label
+			{`[^#{(\s,]+`, GenericHeading, nil},
+			// Comment after non-block label (hack because comments end in \n)
+			{`#.*\n`, CommentSingle, Push("site_block")},
+			// Note: if \n, we'll never pop out of the site_block, it's valid
+			{`\{(?=\s)|\n`, Punctuation, Push("site_block")},
+		},
+		"site_block": {
+			{`\}`, Punctuation, Pop(2)},
+			Include("site_block_common"),
+		},
+	}.Merge(caddyfileCommon),
+))
+
+// Caddyfile directive-only lexer.
+var CaddyfileDirectives = internal.Register(MustNewLexer(
+	&Config{
+		Name:      "Caddyfile Directives",
+		Aliases:   []string{"caddyfile-directives", "caddyfile-d", "caddy-d"},
+		Filenames: []string{},
+		MimeTypes: []string{},
+	},
+	Rules{
+		// Same as "site_block" in Caddyfile
+		"root": {
+			Include("site_block_common"),
+		},
+	}.Merge(caddyfileCommon),
+))
diff --git a/vendor/github.com/alecthomas/chroma/lexers/circular/php.go b/vendor/github.com/alecthomas/chroma/lexers/circular/php.go
index d7f89404bf..2107cb7a6d 100644
--- a/vendor/github.com/alecthomas/chroma/lexers/circular/php.go
+++ b/vendor/github.com/alecthomas/chroma/lexers/circular/php.go
@@ -1,15 +1,12 @@
 package circular
 
 import (
-	"strings"
-
 	. "github.com/alecthomas/chroma" // nolint
-	"github.com/alecthomas/chroma/lexers/h"
 	"github.com/alecthomas/chroma/lexers/internal"
 )
 
-// PHP lexer.
-var PHP = internal.Register(DelegatingLexer(h.HTML, MustNewLexer(
+// PHP lexer for pure PHP code (not embedded in HTML).
+var PHP = internal.Register(MustNewLexer(
 	&Config{
 		Name:            "PHP",
 		Aliases:         []string{"php", "php3", "php4", "php5"},
@@ -19,73 +16,65 @@ var PHP = internal.Register(DelegatingLexer(h.HTML, MustNewLexer(
 		CaseInsensitive: true,
 		EnsureNL:        true,
 	},
-	Rules{
-		"root": {
-			{`<\?(php)?`, CommentPreproc, Push("php")},
-			{`[^<]+`, Other, nil},
-			{`<`, Other, nil},
-		},
-		"php": {
-			{`\?>`, CommentPreproc, Pop(1)},
-			{`(<<<)([\'"]?)((?:[\\_a-z]|[^\x00-\x7f])(?:[\\\w]|[^\x00-\x7f])*)(\2\n.*?\n\s*)(\3)(;?)(\n)`, ByGroups(LiteralString, LiteralString, LiteralStringDelimiter, LiteralString, LiteralStringDelimiter, Punctuation, Text), nil},
-			{`\s+`, Text, nil},
-			{`#.*?\n`, CommentSingle, nil},
-			{`//.*?\n`, CommentSingle, nil},
-			{`/\*\*/`, CommentMultiline, nil},
-			{`/\*\*.*?\*/`, LiteralStringDoc, nil},
-			{`/\*.*?\*/`, CommentMultiline, nil},
-			{`(->|::)(\s*)((?:[\\_a-z]|[^\x00-\x7f])(?:[\\\w]|[^\x00-\x7f])*)`, ByGroups(Operator, Text, NameAttribute), nil},
-			{`[~!%^&*+=|:.<>/@-]+`, Operator, nil},
-			{`\?`, Operator, nil},
-			{`[\[\]{}();,]+`, Punctuation, nil},
-			{`(class)(\s+)`, ByGroups(Keyword, Text), Push("classname")},
-			{`(function)(\s*)(?=\()`, ByGroups(Keyword, Text), nil},
-			{`(function)(\s+)(&?)(\s*)`, ByGroups(Keyword, Text, Operator, Text), Push("functionname")},
-			{`(const)(\s+)((?:[\\_a-z]|[^\x00-\x7f])(?:[\\\w]|[^\x00-\x7f])*)`, ByGroups(Keyword, Text, NameConstant), nil},
-			{`(and|E_PARSE|old_function|E_ERROR|or|as|E_WARNING|parent|eval|PHP_OS|break|exit|case|extends|PHP_VERSION|cfunction|FALSE|print|for|require|continue|foreach|require_once|declare|return|default|static|do|switch|die|stdClass|echo|else|TRUE|elseif|var|empty|if|xor|enddeclare|include|virtual|endfor|include_once|while|endforeach|global|endif|list|endswitch|new|endwhile|not|array|E_ALL|NULL|final|php_user_filter|interface|implements|public|private|protected|abstract|clone|try|catch|throw|this|use|namespace|trait|yield|finally)\b`, Keyword, nil},
-			{`(true|false|null)\b`, KeywordConstant, nil},
-			Include("magicconstants"),
-			{`\$\{\$+(?:[\\_a-z]|[^\x00-\x7f])(?:[\\\w]|[^\x00-\x7f])*\}`, NameVariable, nil},
-			{`\$+(?:[\\_a-z]|[^\x00-\x7f])(?:[\\\w]|[^\x00-\x7f])*`, NameVariable, nil},
-			{`(?:[\\_a-z]|[^\x00-\x7f])(?:[\\\w]|[^\x00-\x7f])*`, NameOther, nil},
-			{`(\d+\.\d*|\d*\.\d+)(e[+-]?[0-9]+)?`, LiteralNumberFloat, nil},
-			{`\d+e[+-]?[0-9]+`, LiteralNumberFloat, nil},
-			{`0[0-7]+`, LiteralNumberOct, nil},
-			{`0x[a-f0-9]+`, LiteralNumberHex, nil},
-			{`\d+`, LiteralNumberInteger, nil},
-			{`0b[01]+`, LiteralNumberBin, nil},
-			{`'([^'\\]*(?:\\.[^'\\]*)*)'`, LiteralStringSingle, nil},
-			{"`([^`\\\\]*(?:\\\\.[^`\\\\]*)*)`", LiteralStringBacktick, nil},
-			{`"`, LiteralStringDouble, Push("string")},
-		},
-		"magicfuncs": {
-			{Words(``, `\b`, `__construct`, `__destruct`, `__call`, `__callStatic`, `__get`, `__set`, `__isset`, `__unset`, `__sleep`, `__wakeup`, `__toString`, `__invoke`, `__set_state`, `__clone`, `__debugInfo`), NameFunctionMagic, nil},
-		},
-		"magicconstants": {
-			{Words(``, `\b`, `__LINE__`, `__FILE__`, `__DIR__`, `__FUNCTION__`, `__CLASS__`, `__TRAIT__`, `__METHOD__`, `__NAMESPACE__`), NameConstant, nil},
-		},
-		"classname": {
-			{`(?:[\\_a-z]|[^\x00-\x7f])(?:[\\\w]|[^\x00-\x7f])*`, NameClass, Pop(1)},
-		},
-		"functionname": {
-			Include("magicfuncs"),
-			{`(?:[\\_a-z]|[^\x00-\x7f])(?:[\\\w]|[^\x00-\x7f])*`, NameFunction, Pop(1)},
-			Default(Pop(1)),
-		},
-		"string": {
-			{`"`, LiteralStringDouble, Pop(1)},
-			{`[^{$"\\]+`, LiteralStringDouble, nil},
-			{`\\([nrt"$\\]|[0-7]{1,3}|x[0-9a-f]{1,2})`, LiteralStringEscape, nil},
-			{`\$(?:[\\_a-z]|[^\x00-\x7f])(?:[\\\w]|[^\x00-\x7f])*(\[\S+?\]|->(?:[\\_a-z]|[^\x00-\x7f])(?:[\\\w]|[^\x00-\x7f])*)?`, LiteralStringInterpol, nil},
-			{`(\{\$\{)(.*?)(\}\})`, ByGroups(LiteralStringInterpol, UsingSelf("root"), LiteralStringInterpol), nil},
-			{`(\{)(\$.*?)(\})`, ByGroups(LiteralStringInterpol, UsingSelf("root"), LiteralStringInterpol), nil},
-			{`(\$\{)(\S+)(\})`, ByGroups(LiteralStringInterpol, NameVariable, LiteralStringInterpol), nil},
-			{`[${\\]`, LiteralStringDouble, nil},
-		},
+	phpCommonRules.Rename("php", "root"),
+))
+
+var phpCommonRules = Rules{
+	"php": {
+		{`\?>`, CommentPreproc, Pop(1)},
+		{`(<<<)([\'"]?)((?:[\\_a-z]|[^\x00-\x7f])(?:[\\\w]|[^\x00-\x7f])*)(\2\n.*?\n\s*)(\3)(;?)(\n)`, ByGroups(LiteralString, LiteralString, LiteralStringDelimiter, LiteralString, LiteralStringDelimiter, Punctuation, Text), nil},
+		{`\s+`, Text, nil},
+		{`#.*?\n`, CommentSingle, nil},
+		{`//.*?\n`, CommentSingle, nil},
+		{`/\*\*/`, CommentMultiline, nil},
+		{`/\*\*.*?\*/`, LiteralStringDoc, nil},
+		{`/\*.*?\*/`, CommentMultiline, nil},
+		{`(->|::)(\s*)((?:[\\_a-z]|[^\x00-\x7f])(?:[\\\w]|[^\x00-\x7f])*)`, ByGroups(Operator, Text, NameAttribute), nil},
+		{`[~!%^&*+=|:.<>/@-]+`, Operator, nil},
+		{`\?`, Operator, nil},
+		{`[\[\]{}();,]+`, Punctuation, nil},
+		{`(class)(\s+)`, ByGroups(Keyword, Text), Push("classname")},
+		{`(function)(\s*)(?=\()`, ByGroups(Keyword, Text), nil},
+		{`(function)(\s+)(&?)(\s*)`, ByGroups(Keyword, Text, Operator, Text), Push("functionname")},
+		{`(const)(\s+)((?:[\\_a-z]|[^\x00-\x7f])(?:[\\\w]|[^\x00-\x7f])*)`, ByGroups(Keyword, Text, NameConstant), nil},
+		{`(and|E_PARSE|old_function|E_ERROR|or|as|E_WARNING|parent|eval|PHP_OS|break|exit|case|extends|PHP_VERSION|cfunction|FALSE|print|for|require|continue|foreach|require_once|declare|return|default|static|do|switch|die|stdClass|echo|else|TRUE|elseif|var|empty|if|xor|enddeclare|include|virtual|endfor|include_once|while|endforeach|global|endif|list|endswitch|new|endwhile|not|array|E_ALL|NULL|final|php_user_filter|interface|implements|public|private|protected|abstract|clone|try|catch|throw|this|use|namespace|trait|yield|finally)\b`, Keyword, nil},
+		{`(true|false|null)\b`, KeywordConstant, nil},
+		Include("magicconstants"),
+		{`\$\{\$+(?:[\\_a-z]|[^\x00-\x7f])(?:[\\\w]|[^\x00-\x7f])*\}`, NameVariable, nil},
+		{`\$+(?:[\\_a-z]|[^\x00-\x7f])(?:[\\\w]|[^\x00-\x7f])*`, NameVariable, nil},
+		{`(?:[\\_a-z]|[^\x00-\x7f])(?:[\\\w]|[^\x00-\x7f])*`, NameOther, nil},
+		{`(\d+\.\d*|\d*\.\d+)(e[+-]?[0-9]+)?`, LiteralNumberFloat, nil},
+		{`\d+e[+-]?[0-9]+`, LiteralNumberFloat, nil},
+		{`0[0-7]+`, LiteralNumberOct, nil},
+		{`0x[a-f0-9]+`, LiteralNumberHex, nil},
+		{`\d+`, LiteralNumberInteger, nil},
+		{`0b[01]+`, LiteralNumberBin, nil},
+		{`'([^'\\]*(?:\\.[^'\\]*)*)'`, LiteralStringSingle, nil},
+		{"`([^`\\\\]*(?:\\\\.[^`\\\\]*)*)`", LiteralStringBacktick, nil},
+		{`"`, LiteralStringDouble, Push("string")},
+	},
+	"magicfuncs": {
+		{Words(``, `\b`, `__construct`, `__destruct`, `__call`, `__callStatic`, `__get`, `__set`, `__isset`, `__unset`, `__sleep`, `__wakeup`, `__toString`, `__invoke`, `__set_state`, `__clone`, `__debugInfo`), NameFunctionMagic, nil},
+	},
+	"magicconstants": {
+		{Words(``, `\b`, `__LINE__`, `__FILE__`, `__DIR__`, `__FUNCTION__`, `__CLASS__`, `__TRAIT__`, `__METHOD__`, `__NAMESPACE__`), NameConstant, nil},
+	},
+	"classname": {
+		{`(?:[\\_a-z]|[^\x00-\x7f])(?:[\\\w]|[^\x00-\x7f])*`, NameClass, Pop(1)},
+	},
+	"functionname": {
+		Include("magicfuncs"),
+		{`(?:[\\_a-z]|[^\x00-\x7f])(?:[\\\w]|[^\x00-\x7f])*`, NameFunction, Pop(1)},
+		Default(Pop(1)),
+	},
+	"string": {
+		{`"`, LiteralStringDouble, Pop(1)},
+		{`[^{$"\\]+`, LiteralStringDouble, nil},
+		{`\\([nrt"$\\]|[0-7]{1,3}|x[0-9a-f]{1,2})`, LiteralStringEscape, nil},
+		{`\$(?:[\\_a-z]|[^\x00-\x7f])(?:[\\\w]|[^\x00-\x7f])*(\[\S+?\]|->(?:[\\_a-z]|[^\x00-\x7f])(?:[\\\w]|[^\x00-\x7f])*)?`, LiteralStringInterpol, nil},
+		{`(\{\$\{)(.*?)(\}\})`, ByGroups(LiteralStringInterpol, UsingSelf("root"), LiteralStringInterpol), nil},
+		{`(\{)(\$.*?)(\})`, ByGroups(LiteralStringInterpol, UsingSelf("root"), LiteralStringInterpol), nil},
+		{`(\$\{)(\S+)(\})`, ByGroups(LiteralStringInterpol, NameVariable, LiteralStringInterpol), nil},
+		{`[${\\]`, LiteralStringDouble, nil},
 	},
-).SetAnalyser(func(text string) float32 {
-	if strings.Contains(text, "<?php") {
-		return 0.5
-	}
-	return 0.0
-})))
+}
diff --git a/vendor/github.com/alecthomas/chroma/lexers/circular/phtml.go b/vendor/github.com/alecthomas/chroma/lexers/circular/phtml.go
new file mode 100644
index 0000000000..b9bffd3541
--- /dev/null
+++ b/vendor/github.com/alecthomas/chroma/lexers/circular/phtml.go
@@ -0,0 +1,34 @@
+package circular
+
+import (
+	"strings"
+
+	. "github.com/alecthomas/chroma" // nolint
+	"github.com/alecthomas/chroma/lexers/h"
+	"github.com/alecthomas/chroma/lexers/internal"
+)
+
+// PHTML lexer is PHP in HTML.
+var PHTML = internal.Register(DelegatingLexer(h.HTML, MustNewLexer(
+	&Config{
+		Name:            "PHTML",
+		Aliases:         []string{"phtml"},
+		Filenames:       []string{"*.phtml"},
+		MimeTypes:       []string{"application/x-php", "application/x-httpd-php", "application/x-httpd-php3", "application/x-httpd-php4", "application/x-httpd-php5"},
+		DotAll:          true,
+		CaseInsensitive: true,
+		EnsureNL:        true,
+	},
+	Rules{
+		"root": {
+			{`<\?(php)?`, CommentPreproc, Push("php")},
+			{`[^<]+`, Other, nil},
+			{`<`, Other, nil},
+		},
+	}.Merge(phpCommonRules),
+).SetAnalyser(func(text string) float32 {
+	if strings.Contains(text, "<?php") {
+		return 0.5
+	}
+	return 0.0
+})))
diff --git a/vendor/github.com/alecthomas/chroma/lexers/g/go.go b/vendor/github.com/alecthomas/chroma/lexers/g/go.go
index a93fa8bbb0..33077e0e3c 100644
--- a/vendor/github.com/alecthomas/chroma/lexers/g/go.go
+++ b/vendor/github.com/alecthomas/chroma/lexers/g/go.go
@@ -15,6 +15,7 @@ var Go = internal.Register(MustNewLexer(
 		Aliases:   []string{"go", "golang"},
 		Filenames: []string{"*.go"},
 		MimeTypes: []string{"text/x-gosrc"},
+		EnsureNL:  true,
 	},
 	Rules{
 		"root": {
diff --git a/vendor/github.com/alecthomas/chroma/lexers/h/http.go b/vendor/github.com/alecthomas/chroma/lexers/h/http.go
index 0a1264cf08..135ec73fda 100644
--- a/vendor/github.com/alecthomas/chroma/lexers/h/http.go
+++ b/vendor/github.com/alecthomas/chroma/lexers/h/http.go
@@ -19,8 +19,8 @@ var HTTP = internal.Register(httpBodyContentTypeLexer(MustNewLexer(
 	},
 	Rules{
 		"root": {
-			{`(GET|POST|PUT|DELETE|HEAD|OPTIONS|TRACE|PATCH|CONNECT)( +)([^ ]+)( +)(HTTP)(/)(1\.[01])(\r?\n|\Z)`, ByGroups(NameFunction, Text, NameNamespace, Text, KeywordReserved, Operator, LiteralNumber, Text), Push("headers")},
-			{`(HTTP)(/)(1\.[01])( +)(\d{3})( +)([^\r\n]+)(\r?\n|\Z)`, ByGroups(KeywordReserved, Operator, LiteralNumber, Text, LiteralNumber, Text, NameException, Text), Push("headers")},
+			{`(GET|POST|PUT|DELETE|HEAD|OPTIONS|TRACE|PATCH|CONNECT)( +)([^ ]+)( +)(HTTP)(/)([12]\.[01])(\r?\n|\Z)`, ByGroups(NameFunction, Text, NameNamespace, Text, KeywordReserved, Operator, LiteralNumber, Text), Push("headers")},
+			{`(HTTP)(/)([12]\.[01])( +)(\d{3})( +)([^\r\n]+)(\r?\n|\Z)`, ByGroups(KeywordReserved, Operator, LiteralNumber, Text, LiteralNumber, Text, NameException, Text), Push("headers")},
 		},
 		"headers": {
 			{`([^\s:]+)( *)(:)( *)([^\r\n]+)(\r?\n|\Z)`, EmitterFunc(httpHeaderBlock), nil},
diff --git a/vendor/github.com/alecthomas/chroma/lexers/i/ini.go b/vendor/github.com/alecthomas/chroma/lexers/i/ini.go
index 39b5edd2e6..e57f865055 100644
--- a/vendor/github.com/alecthomas/chroma/lexers/i/ini.go
+++ b/vendor/github.com/alecthomas/chroma/lexers/i/ini.go
@@ -10,7 +10,7 @@ var Ini = internal.Register(MustNewLexer(
 	&Config{
 		Name:      "INI",
 		Aliases:   []string{"ini", "cfg", "dosini"},
-		Filenames: []string{"*.ini", "*.cfg", "*.inf", ".gitconfig"},
+		Filenames: []string{"*.ini", "*.cfg", "*.inf", ".gitconfig", ".editorconfig"},
 		MimeTypes: []string{"text/x-ini", "text/inf"},
 	},
 	Rules{
diff --git a/vendor/github.com/alecthomas/chroma/lexers/lexers.go b/vendor/github.com/alecthomas/chroma/lexers/lexers.go
index 2897299c8f..de2d7ce3f8 100644
--- a/vendor/github.com/alecthomas/chroma/lexers/lexers.go
+++ b/vendor/github.com/alecthomas/chroma/lexers/lexers.go
@@ -32,6 +32,7 @@ import (
 	_ "github.com/alecthomas/chroma/lexers/w"
 	_ "github.com/alecthomas/chroma/lexers/x"
 	_ "github.com/alecthomas/chroma/lexers/y"
+	_ "github.com/alecthomas/chroma/lexers/z"
 )
 
 // Registry of Lexers.
diff --git a/vendor/github.com/alecthomas/chroma/lexers/p/pony.go b/vendor/github.com/alecthomas/chroma/lexers/p/pony.go
new file mode 100644
index 0000000000..9696b2079b
--- /dev/null
+++ b/vendor/github.com/alecthomas/chroma/lexers/p/pony.go
@@ -0,0 +1,59 @@
+package p
+
+import (
+	. "github.com/alecthomas/chroma" // nolint
+	"github.com/alecthomas/chroma/lexers/internal"
+)
+
+// Pony lexer.
+var Pony = internal.Register(MustNewLexer(
+	&Config{
+		Name:      "Pony",
+		Aliases:   []string{"pony"},
+		Filenames: []string{"*.pony"},
+		MimeTypes: []string{},
+	},
+	Rules{
+		"root": {
+			{`\n`, Text, nil},
+			{`[^\S\n]+`, Text, nil},
+			{`//.*\n`, CommentSingle, nil},
+			{`/\*`, CommentMultiline, Push("nested_comment")},
+			{`"""(?:.|\n)*?"""`, LiteralStringDoc, nil},
+			{`"`, LiteralString, Push("string")},
+			{`\'.*\'`, LiteralStringChar, nil},
+			{`=>|[]{}:().~;,|&!^?[]`, Punctuation, nil},
+			{Words(``, `\b`, `addressof`, `and`, `as`, `consume`, `digestof`, `is`, `isnt`, `not`, `or`), OperatorWord, nil},
+			{`!=|==|<<|>>|[-+/*%=<>]`, Operator, nil},
+			{Words(``, `\b`, `box`, `break`, `compile_error`, `compile_intrinsic`, `continue`, `do`, `else`, `elseif`, `embed`, `end`, `error`, `for`, `if`, `ifdef`, `in`, `iso`, `lambda`, `let`, `match`, `object`, `recover`, `ref`, `repeat`, `return`, `tag`, `then`, `this`, `trn`, `try`, `until`, `use`, `var`, `val`, `where`, `while`, `with`, `#any`, `#read`, `#send`, `#share`), Keyword, nil},
+			{`(actor|class|struct|primitive|interface|trait|type)((?:\s)+)`, ByGroups(Keyword, Text), Push("typename")},
+			{`(new|fun|be)((?:\s)+)`, ByGroups(Keyword, Text), Push("methodname")},
+			{Words(``, `\b`, `U8`, `U16`, `U32`, `U64`, `ULong`, `USize`, `U128`, `Unsigned`, `Stringable`, `String`, `StringBytes`, `StringRunes`, `InputNotify`, `InputStream`, `Stdin`, `ByteSeq`, `ByteSeqIter`, `OutStream`, `StdStream`, `SourceLoc`, `I8`, `I16`, `I32`, `I64`, `ILong`, `ISize`, `I128`, `Signed`, `Seq`, `RuntimeOptions`, `Real`, `Integer`, `SignedInteger`, `UnsignedInteger`, `FloatingPoint`, `Number`, `Int`, `ReadSeq`, `ReadElement`, `Pointer`, `Platform`, `NullablePointer`, `None`, `Iterator`, `F32`, `F64`, `Float`, `Env`, `DoNotOptimise`, `DisposableActor`, `Less`, `Equal`, `Greater`, `Compare`, `HasEq`, `Equatable`, `Comparable`, `Bool`, `AsioEventID`, `AsioEventNotify`, `AsioEvent`, `Array`, `ArrayKeys`, `ArrayValues`, `ArrayPairs`, `Any`, `AmbientAuth`), KeywordType, nil},
+			{`_?[A-Z]\w*`, NameClass, nil},
+			{`string\(\)`, NameOther, nil},
+			{`(\d+\.\d*|\.\d+|\d+)[eE][+-]?\d+`, LiteralNumberFloat, nil},
+			{`0x[0-9a-fA-F]+`, LiteralNumberHex, nil},
+			{`\d+`, LiteralNumberInteger, nil},
+			{`(true|false)\b`, Keyword, nil},
+			{`_\d*`, Name, nil},
+			{`_?[a-z][\w\'_]*`, Name, nil},
+		},
+		"typename": {
+			{`(iso|trn|ref|val|box|tag)?((?:\s)*)(_?[A-Z]\w*)`, ByGroups(Keyword, Text, NameClass), Pop(1)},
+		},
+		"methodname": {
+			{`(iso|trn|ref|val|box|tag)?((?:\s)*)(_?[a-z]\w*)`, ByGroups(Keyword, Text, NameFunction), Pop(1)},
+		},
+		"nested_comment": {
+			{`[^*/]+`, CommentMultiline, nil},
+			{`/\*`, CommentMultiline, Push()},
+			{`\*/`, CommentMultiline, Pop(1)},
+			{`[*/]`, CommentMultiline, nil},
+		},
+		"string": {
+			{`"`, LiteralString, Pop(1)},
+			{`\\"`, LiteralString, nil},
+			{`[^\\"]+`, LiteralString, nil},
+		},
+	},
+))
diff --git a/vendor/github.com/alecthomas/chroma/lexers/t/toml.go b/vendor/github.com/alecthomas/chroma/lexers/t/toml.go
index 68bfc90532..cc0a38e42b 100644
--- a/vendor/github.com/alecthomas/chroma/lexers/t/toml.go
+++ b/vendor/github.com/alecthomas/chroma/lexers/t/toml.go
@@ -22,7 +22,7 @@ var TOML = internal.Register(MustNewLexer(
 			{`[+-]?[0-9](_?\d)*`, LiteralNumberInteger, nil},
 			{`"(\\\\|\\"|[^"])*"`, StringDouble, nil},
 			{`'(\\\\|\\'|[^'])*'`, StringSingle, nil},
-			{`[.,=\[\]]`, Punctuation, nil},
+			{`[.,=\[\]{}]`, Punctuation, nil},
 			{`[^\W\d]\w*`, NameOther, nil},
 		},
 	},
diff --git a/vendor/github.com/alecthomas/chroma/lexers/t/typescript.go b/vendor/github.com/alecthomas/chroma/lexers/t/typescript.go
index 3b425ed0bc..5205e01105 100644
--- a/vendor/github.com/alecthomas/chroma/lexers/t/typescript.go
+++ b/vendor/github.com/alecthomas/chroma/lexers/t/typescript.go
@@ -38,14 +38,14 @@ var TypeScript = internal.Register(MustNewLexer(
 			{`\+\+|--|~|&&|\?|:|\|\||\\(?=\n)|(<<|>>>?|==?|!=?|[-<>+*%&|^/])=?`, Operator, Push("slashstartsregex")},
 			{`[{(\[;,]`, Punctuation, Push("slashstartsregex")},
 			{`[})\].]`, Punctuation, nil},
-			{`(for|in|while|do|break|return|continue|switch|case|default|if|else|throw|try|catch|finally|new|delete|typeof|instanceof|void|this)\b`, Keyword, Push("slashstartsregex")},
+			{`(for|in|of|while|do|break|return|yield|continue|switch|case|default|if|else|throw|try|catch|finally|new|delete|typeof|instanceof|keyof|asserts|is|infer|await|void|this)\b`, Keyword, Push("slashstartsregex")},
 			{`(var|let|with|function)\b`, KeywordDeclaration, Push("slashstartsregex")},
-			{`(abstract|boolean|byte|char|class|const|debugger|double|enum|export|extends|final|float|goto|implements|import|int|interface|long|native|package|private|protected|public|short|static|super|synchronized|throws|transient|volatile)\b`, KeywordReserved, nil},
+			{`(abstract|async|boolean|class|const|debugger|enum|export|extends|from|get|global|goto|implements|import|interface|namespace|package|private|protected|public|readonly|require|set|static|super|type)\b`, KeywordReserved, nil},
 			{`(true|false|null|NaN|Infinity|undefined)\b`, KeywordConstant, nil},
-			{`(Array|Boolean|Date|Error|Function|Math|netscape|Number|Object|Packages|RegExp|String|sun|decodeURI|decodeURIComponent|encodeURI|encodeURIComponent|Error|eval|isFinite|isNaN|parseFloat|parseInt|document|this|window)\b`, NameBuiltin, nil},
+			{`(Array|Boolean|Date|Error|Function|Math|Number|Object|Packages|RegExp|String|decodeURI|decodeURIComponent|encodeURI|encodeURIComponent|eval|isFinite|isNaN|parseFloat|parseInt|document|this|window)\b`, NameBuiltin, nil},
 			{`\b(module)(\s*)(\s*[\w?.$][\w?.$]*)(\s*)`, ByGroups(KeywordReserved, Text, NameOther, Text), Push("slashstartsregex")},
-			{`\b(string|bool|number)\b`, KeywordType, nil},
-			{`\b(constructor|declare|interface|as|AS)\b`, KeywordReserved, nil},
+			{`\b(string|bool|number|any|never|object|symbol|unique|unknown|bigint)\b`, KeywordType, nil},
+			{`\b(constructor|declare|interface|as)\b`, KeywordReserved, nil},
 			{`(super)(\s*)(\([\w,?.$\s]+\s*\))`, ByGroups(KeywordReserved, Text), Push("slashstartsregex")},
 			{`([a-zA-Z_?.$][\w?.$]*)\(\) \{`, NameOther, Push("slashstartsregex")},
 			{`([\w?.$][\w?.$]*)(\s*:\s*)([\w?.$][\w?.$]*)`, ByGroups(NameOther, Text, KeywordType), nil},
diff --git a/vendor/github.com/alecthomas/chroma/lexers/y/yaml.go b/vendor/github.com/alecthomas/chroma/lexers/y/yaml.go
index 82fed0c0f4..8eb0d45155 100644
--- a/vendor/github.com/alecthomas/chroma/lexers/y/yaml.go
+++ b/vendor/github.com/alecthomas/chroma/lexers/y/yaml.go
@@ -15,32 +15,35 @@ var YAML = internal.Register(MustNewLexer(
 	Rules{
 		"root": {
 			Include("whitespace"),
-			{`^---`, Text, nil},
+			{`^---`, NameNamespace, nil},
+			{`^\.\.\.`, NameNamespace, nil},
 			{`[\n?]?\s*- `, Text, nil},
 			{`#.*$`, Comment, nil},
 			{`!![^\s]+`, CommentPreproc, nil},
 			{`&[^\s]+`, CommentPreproc, nil},
 			{`\*[^\s]+`, CommentPreproc, nil},
 			{`^%include\s+[^\n\r]+`, CommentPreproc, nil},
-			{`([>|+-]\s+)(\s+)((?:(?:.*?$)(?:[\n\r]*?)?)*)`, ByGroups(StringDoc, StringDoc, StringDoc), nil},
+			{`[>|](?:[+-])?\s(?:^(?:[ \n]{1})+.*\n?)*$`, StringDoc, nil},
 			Include("key"),
 			Include("value"),
 			{`[?:,\[\]]`, Punctuation, nil},
 			{`.`, Text, nil},
 		},
 		"value": {
-			{Words(``, `\b`, "true", "false", "null"), KeywordConstant, nil},
+			{Words(``, `\b`, "true", "True", "TRUE", "false", "False", "FALSE", "null",
+				"y", "Y", "yes", "Yes", "YES", "n", "N", "no", "No", "NO",
+				"on", "On", "ON", "off", "Off", "OFF"), KeywordConstant, nil},
 			{`"(?:\\.|[^"])*"`, StringDouble, nil},
 			{`'(?:\\.|[^'])*'`, StringSingle, nil},
 			{`\d\d\d\d-\d\d-\d\d([T ]\d\d:\d\d:\d\d(\.\d+)?(Z|\s+[-+]\d+)?)?`, LiteralDate, nil},
 			{`\b[+\-]?(0x[\da-f]+|0o[0-7]+|(\d+\.?\d*|\.?\d+)(e[\+\-]?\d+)?|\.inf|\.nan)\b`, Number, nil},
-			{`\b[\w]+\b`, Text, nil},
+			{`[^\{\}\[\]\?,\:\!\-\*&\@].*`, Literal, nil},
 		},
 		"key": {
-			{`"[^"\n].*": `, Keyword, nil},
-			{`(-)( )([^"\n{]*)(:)( )`, ByGroups(Punctuation, Whitespace, Keyword, Punctuation, Whitespace), nil},
-			{`([^"\n{]*)(:)( )`, ByGroups(Keyword, Punctuation, Whitespace), nil},
-			{`([^"\n{]*)(:)(\n)`, ByGroups(Keyword, Punctuation, Whitespace), nil},
+			{`"[^"\n].*": `, NameTag, nil},
+			{`(-)( )([^"\n{]*)(:)( )`, ByGroups(Punctuation, Whitespace, NameTag, Punctuation, Whitespace), nil},
+			{`([^"\n{]*)(:)( )`, ByGroups(NameTag, Punctuation, Whitespace), nil},
+			{`([^"\n{]*)(:)(\n)`, ByGroups(NameTag, Punctuation, Whitespace), nil},
 		},
 		"whitespace": {
 			{`\s+`, Whitespace, nil},
diff --git a/vendor/github.com/alecthomas/chroma/lexers/z/zig.go b/vendor/github.com/alecthomas/chroma/lexers/z/zig.go
new file mode 100644
index 0000000000..6c6c8f91e9
--- /dev/null
+++ b/vendor/github.com/alecthomas/chroma/lexers/z/zig.go
@@ -0,0 +1,54 @@
+package z
+
+import (
+	. "github.com/alecthomas/chroma" // nolint
+	"github.com/alecthomas/chroma/lexers/internal"
+)
+
+// Zig lexer.
+var Zig = internal.Register(MustNewLexer(
+	&Config{
+		Name:      "Zig",
+		Aliases:   []string{"zig"},
+		Filenames: []string{"*.zig"},
+		MimeTypes: []string{"text/zig"},
+	},
+	Rules{
+		"root": {
+			{`\n`, TextWhitespace, nil},
+			{`\s+`, TextWhitespace, nil},
+			{`//.*?\n`, CommentSingle, nil},
+			{Words(``, `\b`, `break`, `return`, `continue`, `asm`, `defer`, `errdefer`, `unreachable`, `try`, `catch`, `async`, `await`, `suspend`, `resume`, `cancel`), Keyword, nil},
+			{Words(``, `\b`, `const`, `var`, `extern`, `packed`, `export`, `pub`, `noalias`, `inline`, `comptime`, `nakedcc`, `stdcallcc`, `volatile`, `allowzero`, `align`, `linksection`, `threadlocal`), KeywordReserved, nil},
+			{Words(``, `\b`, `struct`, `enum`, `union`, `error`), Keyword, nil},
+			{Words(``, `\b`, `while`, `for`), Keyword, nil},
+			{Words(``, `\b`, `bool`, `f16`, `f32`, `f64`, `f128`, `void`, `noreturn`, `type`, `anyerror`, `promise`, `i0`, `u0`, `isize`, `usize`, `comptime_int`, `comptime_float`, `c_short`, `c_ushort`, `c_int`, `c_uint`, `c_long`, `c_ulong`, `c_longlong`, `c_ulonglong`, `c_longdouble`, `c_voidi8`, `u8`, `i16`, `u16`, `i32`, `u32`, `i64`, `u64`, `i128`, `u128`), KeywordType, nil},
+			{Words(``, `\b`, `true`, `false`, `null`, `undefined`), KeywordConstant, nil},
+			{Words(``, `\b`, `if`, `else`, `switch`, `and`, `or`, `orelse`), Keyword, nil},
+			{Words(``, `\b`, `fn`, `usingnamespace`, `test`), Keyword, nil},
+			{`0x[0-9a-fA-F]+\.[0-9a-fA-F]+([pP][\-+]?[0-9a-fA-F]+)?`, LiteralNumberFloat, nil},
+			{`0x[0-9a-fA-F]+\.?[pP][\-+]?[0-9a-fA-F]+`, LiteralNumberFloat, nil},
+			{`[0-9]+\.[0-9]+([eE][-+]?[0-9]+)?`, LiteralNumberFloat, nil},
+			{`[0-9]+\.?[eE][-+]?[0-9]+`, LiteralNumberFloat, nil},
+			{`0b[01]+`, LiteralNumberBin, nil},
+			{`0o[0-7]+`, LiteralNumberOct, nil},
+			{`0x[0-9a-fA-F]+`, LiteralNumberHex, nil},
+			{`[0-9]+`, LiteralNumberInteger, nil},
+			{`@[a-zA-Z_]\w*`, NameBuiltin, nil},
+			{`[a-zA-Z_]\w*`, Name, nil},
+			{`\'\\\'\'`, LiteralStringEscape, nil},
+			{`\'\\(|x[a-fA-F0-9]{2}|u[a-fA-F0-9]{4}|U[a-fA-F0-9]{6}|[nr\\t\'"])\'`, LiteralStringEscape, nil},
+			{`\'[^\\\']\'`, LiteralString, nil},
+			{`\\\\[^\n]*`, LiteralStringHeredoc, nil},
+			{`c\\\\[^\n]*`, LiteralStringHeredoc, nil},
+			{`c?"`, LiteralString, Push("string")},
+			{`[+%=><|^!?/\-*&~:]`, Operator, nil},
+			{`[{}()\[\],.;]`, Punctuation, nil},
+		},
+		"string": {
+			{`\\(x[a-fA-F0-9]{2}|u[a-fA-F0-9]{4}|U[a-fA-F0-9]{6}|[nr\\t\'"])`, LiteralStringEscape, nil},
+			{`[^\\"\n]+`, LiteralString, nil},
+			{`"`, LiteralString, Pop(1)},
+		},
+	},
+))
diff --git a/vendor/github.com/alecthomas/chroma/regexp.go b/vendor/github.com/alecthomas/chroma/regexp.go
index d13d58d69f..a3f4eb139f 100644
--- a/vendor/github.com/alecthomas/chroma/regexp.go
+++ b/vendor/github.com/alecthomas/chroma/regexp.go
@@ -6,6 +6,7 @@ import (
 	"regexp"
 	"strings"
 	"sync"
+	"time"
 	"unicode/utf8"
 
 	"github.com/dlclark/regexp2"
@@ -160,6 +161,14 @@ func Tokenise(lexer Lexer, options *TokeniseOptions, text string) ([]Token, erro
 // Rules maps from state to a sequence of Rules.
 type Rules map[string][]Rule
 
+// Rename clones rules then a rule.
+func (r Rules) Rename(old, new string) Rules {
+	r = r.Clone()
+	r[new] = r[old]
+	delete(r, old)
+	return r
+}
+
 // Clone returns a clone of the Rules.
 func (r Rules) Clone() Rules {
 	out := map[string][]Rule{}
@@ -170,6 +179,15 @@ func (r Rules) Clone() Rules {
 	return out
 }
 
+// Merge creates a clone of "r" then merges "rules" into the clone.
+func (r Rules) Merge(rules Rules) Rules {
+	out := r.Clone()
+	for k, v := range rules.Clone() {
+		out[k] = v
+	}
+	return out
+}
+
 // MustNewLexer creates a new Lexer or panics.
 func MustNewLexer(config *Config, rules Rules) *RegexLexer {
 	lexer, err := NewLexer(config, rules)
@@ -376,6 +394,7 @@ func (r *RegexLexer) maybeCompile() (err error) {
 				if err != nil {
 					return fmt.Errorf("failed to compile rule %s.%d: %s", state, i, err)
 				}
+				rule.Regexp.MatchTimeout = time.Millisecond * 250
 			}
 		}
 	}