Fix: Syntax highlighting for various issues (#2810)

* highlighter: Fix region & pattern detection

* syntax/sh: Highlight upper case options too

* syntax/c(pp): Try to synchronize the rules to lower the maintenance effort

* syntax/ruby: Fix explicit filename detection in directories

* highlighter: Respect skip rules in regions

* syntax/sh: Fix parameter expansion, cond. flags and generalize filename via ""

* syntax/php|vi: Correct strings in comments to comments only

Additionally improve vimscript comment handling.

* highlighter: Remove problematic start|end check in find(all)Index()

...and additionally remove recursive region end detection

pkg/highlight/highlighter.go

@@ -96,19 +96,7 @@ func NewHighlighter(def *Def) *Highlighter {
 // color's group (represented as one byte)
 type LineMatch map[int]Group
 
-func findIndex(regex *regexp.Regexp, skip *regexp.Regexp, str []byte, canMatchStart, canMatchEnd bool) []int {
-	regexStr := regex.String()
-	if strings.Contains(regexStr, "^") {
-		if !canMatchStart {
-			return nil
-		}
-	}
-	if strings.Contains(regexStr, "$") {
-		if !canMatchEnd {
-			return nil
-		}
-	}
-
+func findIndex(regex *regexp.Regexp, skip *regexp.Regexp, str []byte) []int {
 	var strbytes []byte
 	if skip != nil {
 		strbytes = skip.ReplaceAllFunc(str, func(match []byte) []byte {
@@ -127,18 +115,7 @@ func findIndex(regex *regexp.Regexp, skip *regexp.Regexp, str []byte, canMatchSt
 	return []int{runePos(match[0], str), runePos(match[1], str)}
 }
 
-func findAllIndex(regex *regexp.Regexp, str []byte, canMatchStart, canMatchEnd bool) [][]int {
-	regexStr := regex.String()
-	if strings.Contains(regexStr, "^") {
-		if !canMatchStart {
-			return nil
-		}
-	}
-	if strings.Contains(regexStr, "$") {
-		if !canMatchEnd {
-			return nil
-		}
-	}
+func findAllIndex(regex *regexp.Regexp, str []byte) [][]int {
 	matches := regex.FindAllIndex(str, -1)
 	for i, m := range matches {
 		matches[i][0] = runePos(m[0], str)
@@ -157,7 +134,7 @@ func (h *Highlighter) highlightRegion(highlights LineMatch, start int, canMatchE
 		}
 	}
 
-	loc := findIndex(curRegion.end, curRegion.skip, line, start == 0, canMatchEnd)
+	loc := findIndex(curRegion.end, curRegion.skip, line)
 	if loc != nil {
 		if !statesOnly {
 			highlights[start+loc[0]] = curRegion.limitGroup
@@ -165,7 +142,6 @@ func (h *Highlighter) highlightRegion(highlights LineMatch, start int, canMatchE
 		if curRegion.parent == nil {
 			if !statesOnly {
 				highlights[start+loc[1]] = 0
-				h.highlightRegion(highlights, start, false, lineNum, sliceEnd(line, loc[0]), curRegion, statesOnly)
 			}
 			h.highlightEmptyRegion(highlights, start+loc[1], canMatchEnd, lineNum, sliceStart(line, loc[1]), statesOnly)
 			return highlights
@@ -190,7 +166,7 @@ func (h *Highlighter) highlightRegion(highlights LineMatch, start int, canMatchE
 
 	var firstRegion *region
 	for _, r := range curRegion.rules.regions {
-		loc := findIndex(r.start, nil, line, start == 0, canMatchEnd)
+		loc := findIndex(r.start, r.skip, line)
 		if loc != nil {
 			if loc[0] < firstLoc[0] {
 				firstLoc = loc
@@ -214,7 +190,7 @@ func (h *Highlighter) highlightRegion(highlights LineMatch, start int, canMatchE
 		}
 
 		for _, p := range curRegion.rules.patterns {
-			matches := findAllIndex(p.regex, line, start == 0, canMatchEnd)
+			matches := findAllIndex(p.regex, line)
 			for _, m := range matches {
 				for i := m[0]; i < m[1]; i++ {
 					fullHighlights[i] = p.group
@@ -247,7 +223,7 @@ func (h *Highlighter) highlightEmptyRegion(highlights LineMatch, start int, canM
 	firstLoc := []int{lineLen, 0}
 	var firstRegion *region
 	for _, r := range h.Def.rules.regions {
-		loc := findIndex(r.start, nil, line, start == 0, canMatchEnd)
+		loc := findIndex(r.start, r.skip, line)
 		if loc != nil {
 			if loc[0] < firstLoc[0] {
 				firstLoc = loc
@@ -274,7 +250,7 @@ func (h *Highlighter) highlightEmptyRegion(highlights LineMatch, start int, canM
 
 	fullHighlights := make([]Group, len(line))
 	for _, p := range h.Def.rules.patterns {
-		matches := findAllIndex(p.regex, line, start == 0, canMatchEnd)
+		matches := findAllIndex(p.regex, line)
 		for _, m := range matches {
 			for i := m[0]; i < m[1]; i++ {
 				fullHighlights[i] = p.group

runtime/syntax/c.yaml

@@ -5,11 +5,10 @@ detect:
 
 rules:
     - identifier: "\\b[A-Z_][0-9A-Z_]+\\b"
-    - type: "\\b(auto|float|double|char|int|short|long|sizeof|enum|void|static|const|struct|union|typedef|extern|(un)?signed|inline)\\b"
+    - type: "\\b(float|double|bool|char|int|short|long|enum|void|struct|union|typedef|(un)?signed|inline)\\b"
     - type: "\\b((s?size)|((u_?)?int(8|16|32|64|ptr)))_t\\b"
     - type: "\\b[a-z_][0-9a-z_]+(_t|_T)\\b"
-    - type.extended: "\\b(bool)\\b"
-    - statement: "\\b(volatile|register|restrict)\\b"
+    - statement: "\\b(auto|volatile|register|restrict|static|const|extern)\\b"
     - statement: "\\b(for|if|while|do|else|case|default|switch)\\b"
     - statement: "\\b(goto|continue|break|return)\\b"
     - preproc: "^[[:space:]]*#[[:space:]]*(define|pragma|include|(un|ifn?)def|endif|el(if|se)|if|warning|error)"
@@ -17,7 +16,7 @@ rules:
     - statement: "__attribute__[[:space:]]*\\(\\([^)]*\\)\\)"
     - statement: "__(aligned|asm|builtin|hidden|inline|packed|restrict|section|typeof|weak)__"
       # Operator Color
-    - symbol.operator: "([.:;,+*|=!\\%]|<|>|/|-|&)"
+    - symbol.operator: "[-+*/%=<>.:;,~&|^!?]|\\b(sizeof)\\b"
     - symbol.brackets: "[(){}]|\\[|\\]"
       # Integer Constants
     - constant.number: "(\\b([1-9][0-9]*|0[0-7]*|0[Xx][0-9A-Fa-f]+|0[Bb][01]+)([Uu][Ll]?[Ll]?|[Ll][Ll]?[Uu]?)?\\b)"
@@ -25,7 +24,7 @@ rules:
     - constant.number: "(\\b(([0-9]*[.][0-9]+|[0-9]+[.][0-9]*)([Ee][+-]?[0-9]+)?|[0-9]+[Ee][+-]?[0-9]+)[FfLl]?\\b)"
       # Hexadecimal Floating Constants
     - constant.number: "(\\b0[Xx]([0-9A-Za-z]*[.][0-9A-Za-z]+|[0-9A-Za-z]+[.][0-9A-Za-z]*)[Pp][+-]?[0-9]+[FfLl]?\\b)"
-    - constant.number: "NULL"
+    - constant.bool: "(\\b(true|false|NULL|nullptr|TRUE|FALSE)\\b)"
 
     - constant.string:
         start: "\""
@@ -53,3 +52,4 @@ rules:
         end: "\\*/"
         rules:
             - todo: "(TODO|XXX|FIXME):?"
+

runtime/syntax/cpp.yaml

@@ -9,7 +9,7 @@ rules:
     - type: "\\b(((s?size)|((u_?)?int(8|16|32|64|ptr))|char(8|16|32))_t|wchar_t)\\b"
     - type: "\\b[a-z_][0-9a-z_]+(_t|_T)\\b"
     - type: "\\b(final|override)\\b"
-    - type.keyword: "\\b(auto|volatile|const(expr|eval|init)?|mutable|register|thread_local|static|extern|decltype|explicit|virtual)\\b"
+    - statement: "\\b(auto|volatile|const(expr|eval|init)?|mutable|register|thread_local|static|extern|decltype|explicit|virtual)\\b"
     - statement: "\\b(class|namespace|template|typename|this|friend|using|public|protected|private|noexcept)\\b"
     - statement: "\\b(concept|requires)\\b"
     - statement: "\\b(import|export|module)\\b"
@@ -34,7 +34,7 @@ rules:
     - constant.number: "(\\b(([0-9']*[.][0-9']+|[0-9']+[.][0-9']*)([Ee][+-]?[0-9']+)?|[0-9']+[Ee][+-]?[0-9']+)[FfLl]?\\b)"
       # Hexadecimal Floating-point Literals
     - constant.number: "(\\b0[Xx]([0-9a-zA-Z']*[.][0-9a-zA-Z']+|[0-9a-zA-Z']+[.][0-9a-zA-Z']*)[Pp][+-]?[0-9']+[FfLl]?\\b)"
-    - constant.bool: "(\\b(true|false|NULL|nullptr)\\b)"
+    - constant.bool: "(\\b(true|false|NULL|nullptr|TRUE|FALSE)\\b)"
 
     - constant.string:
         start: "\""

runtime/syntax/javascript.yaml

@@ -10,12 +10,7 @@ rules:
     - constant.number: "\\b[-+]?([0-9]+[EePp][+-]?[0-9]+)[fFlL]?"
     #- identifier: "[A-Za-z_][A-Za-z0-9_]*[[:space:]]*[(]"
     # ^ this is not correct usage of the identifier color
-    - symbol.brackets: "(\\{|\\})"
-    - symbol.brackets: "(\\(|\\))"
-    - symbol.brackets: "(\\[|\\])"
-    - symbol.brackets: "(\\{|\\})"
-    - symbol.brackets: "(\\(|\\))"
-    - symbol.brackets: "(\\[|\\])"
+    - symbol.brackets: "[(){}]|\\[|\\]"
     - symbol.operator: "([-+/*=<>!~%?:&|]|[.]{3})"
     - statement: "\\b(async|await|break|case|catch|const|continue|debugger|default)\\b"
     - statement: "\\b(delete|do|else|export|finally|for|function\\*?|class|extends)\\b"
@@ -73,7 +68,9 @@ rules:
     - comment:
         start: "/\\*"
         end: "\\*/"
+        skip: "\\\\."
         rules:
+            - constant.specialChar: "\\\\."
             # function documentation
             - identifier: "\\s\\*\\s.*"
             - todo: "(TODO|XXX|FIXME)"

runtime/syntax/justfile.yaml

@@ -2,7 +2,7 @@
 filetype: 'justfile'
 
 detect:
-    filename: '(^\\.?[Jj]ustfile|\\.just)$'
+    filename: "(^\\.?[Jj]ustfile|\\.just)$"
     header: "^#!.*/(env +)?[bg]?just --justfile"
 
 rules:

runtime/syntax/php.yaml

@@ -9,6 +9,9 @@ rules:
     - symbol.tag: "(?i)<[/]?(a(bbr|cronym|ddress|pplet|rea|rticle|side|udio)?|b(ase(font)?|d(i|o)|ig|lockquote|r)?|ca(nvas|ption)|center|cite|co(de|l|lgroup)|d(ata(list)?|d|el|etails|fn|ialog|ir|l|t)|em(bed)?|fieldset|fig(caption|ure)|font|form|(i)?frame|frameset|h[1-6]|hr|i|img|in(put|s)|kbd|keygen|label|legend|li(nk)?|ma(in|p|rk)|menu(item)?|met(a|er)|nav|no(frames|script)|o(l|pt(group|ion)|utput)|p(aram|icture|re|rogress)?|q|r(p|t|uby)|s(trike)?|samp|se(ction|lect)|small|source|span|strong|su(b|p|mmary)|textarea|time|track|u(l)?|var|video|wbr)( .*|>)*?>"
     - symbol.tag.extended: "(?i)<[/]?(body|div|html|head(er)?|footer|title|table|t(body|d|h(ead)?|r|foot))( .*|>)*?>"
     - preproc: "(?i)<[/]?(script|style)( .*|>)*?>"
+    - preproc: "<\\?(php|=)?"
+    - preproc: "\\?>"
+    - preproc: "<!DOCTYPE.+?>"
     - special: "&[^;[[:space:]]]*;"
     - symbol: "[:=]"
     - identifier: "(alt|bgcolor|height|href|label|longdesc|name|onclick|onfocus|onload|onmouseover|size|span|src|style|target|type|value|width)="
@@ -32,6 +35,17 @@ rules:
     - symbol.operator: "(=>|===|!==|==|!=|&&|\\|\\||::|=|->|\\!)"
     - identifier.var: "(\\$[a-zA-Z0-9\\-_]+)"
     - symbol.operator: "[\\(|\\)|/|+|\\-|\\*|\\[|.|,|;]"
+    - symbol.brackets: "(\\[|\\]|\\{|\\}|[()])"
+
+    - comment:
+        start: "(^|[[:space:]])*(//|#)"
+        end: "$"
+        rules: []
+    - comment:
+        start: "/\\*"
+        end: "\\*/"
+        rules: []
+
     - constant.string:
         start: "\""
         end: "\""
@@ -44,14 +58,3 @@ rules:
         skip: "\\\\."
         rules:
             - constant.specialChar: "\\\\[abfnrtv'\\\"\\\\]"
-    - symbol.brackets: "(\\[|\\]|\\{|\\}|[()])"
-    - comment: "(^|[[:space:]])//.*"
-    - comment: "(^|[[:space:]])#.*"
-    - comment:
-        start: "/\\*"
-        end: "\\*/"
-        rules: []
-
-    - preproc: "<\\?(php|=)?"
-    - preproc: "\\?>"
-    - preproc: "<!DOCTYPE.+?>"

runtime/syntax/ruby.yaml

@@ -1,7 +1,7 @@
 filetype: ruby
 
 detect: 
-    filename: "\\.(rb|rake|gemspec)$|^(Gemfile|config.ru|Rakefile|Capfile|Vagrantfile|Guardfile|Appfile|Fastfile|Pluginfile|Podfile|\\.?[Bb]rewfile)$"
+    filename: "\\.(rb|rake|gemspec)$|^(.*[\\/])?(Gemfile|config.ru|Rakefile|Capfile|Vagrantfile|Guardfile|Appfile|Fastfile|Pluginfile|Podfile|\\.?[Bb]rewfile)$"
     header: "^#!.*/(env +)?ruby( |$)"
 
 rules:

runtime/syntax/sh.yaml

@@ -23,7 +23,7 @@ filetype: shell
 # Fix command (fc) files:
 # * bash-fc. (followed by a random string)
 detect:
-    filename: '(\.(sh|bash|ash|ebuild)$|(\.bash(rc|_aliases|_functions|_profile)|\.?profile|Pkgfile|pkgmk\.conf|rc\.conf|PKGBUILD|APKBUILD)$|bash-fc\.)'
+    filename: "(\\.(sh|bash|ash|ebuild)$|(\\.bash(rc|_aliases|_functions|_profile)|\\.?profile|Pkgfile|pkgmk\\.conf|rc\\.conf|PKGBUILD|APKBUILD)$|bash-fc\\.)"
     header: "^#!.*/(env +)?(ba)?(a)?(mk)?sh( |$)"
 
 rules:
@@ -31,7 +31,7 @@ rules:
     - constant.number: "\\b[0-9]+\\b"
       # Conditionals and control flow
     - statement: "\\b(case|do|done|elif|else|esac|exit|fi|for|function|if|in|local|read|return|select|shift|then|time|until|while)\\b"
-    - special: "(\\{|\\}|\\(|\\)|\\;|\\]|\\[|`|\\\\|\\$|<|>|!|=|&|\\|)"
+    - special: "[`$<>!=&~^\\{\\}\\(\\)\\;\\]\\[]+"
       # Shell commands
     - type: "\\b(cd|echo|export|let|set|umask|unset)\\b"
       # Common linux commands
@@ -39,11 +39,10 @@ rules:
       # Coreutils commands
     - type: "\\b(base64|basename|cat|chcon|chgrp|chmod|chown|chroot|cksum|comm|cp|csplit|cut|date|dd|df|dir|dircolors|dirname|du|env|expand|expr|factor|false|fmt|fold|head|hostid|id|install|join|link|ln|logname|ls|md5sum|mkdir|mkfifo|mknod|mktemp|mv|nice|nl|nohup|nproc|numfmt|od|paste|pathchk|pinky|pr|printenv|printf|ptx|pwd|readlink|realpath|rm|rmdir|runcon|seq|(sha1|sha224|sha256|sha384|sha512)sum|shred|shuf|sleep|sort|split|stat|stdbuf|stty|sum|sync|tac|tail|tee|test|time|timeout|touch|tr|true|truncate|tsort|tty|uname|unexpand|uniq|unlink|users|vdir|wc|who|whoami|yes)\\b"
       # Conditional flags
-    - statement: "--[a-z-]+"
-    - statement: "\\ -[a-z]+"
+    - statement: " (-[A-Za-z]+|--[a-z]+)"
 
-    - identifier: "\\$\\{?[0-9A-Za-z_!@#$*?-]+\\}?"
-    - identifier: "\\$\\{?[0-9A-Za-z_!@#$*?-]+\\}?"
+    - identifier: "\\$\\{[0-9A-Za-z_:!%&=+#~@*^$?, .\\-\\/\\[\\]]+\\}"
+    - identifier: "\\$[0-9A-Za-z_:!%&=+#~@*^$?,\\-\\/\\[\\]]+"
 
     - constant.string:
         start: "\""
@@ -62,4 +61,3 @@ rules:
         end: "$"
         rules:
             - todo: "(TODO|XXX|FIXME):?"
-

runtime/syntax/vi.yaml

@@ -4,12 +4,18 @@ detect:
     filename: "(^|/|\\.)(ex|vim)rc$|\\.vim"
 
 rules:
-    - identifier: "[A-Za-z_][A-Za-z0-9_]*[[:space:]]*[()]"
+    - identifier: "[A-Za-z_][A-Za-z0-9_]*[(]+[A-Za-z0-9_:.,\\s]*[)]+"
+    - special: "[()]+"
     - statement: "\\b([nvxsoilc]?(nore|un)?map|[nvlx]n|[ico]?no|[cilovx][um]|s?unm)\\b"
-    - statement: "\\b(snor|nun|nm|set|if|endif|let|unlet)\\b"
-    - statement: "[!&=]"
+    - statement: "\\b(snor|nun|nm|set|if|endif|let|unlet|source)\\b"
+    - statement: "[!&=?]"
     - constant.number: "\\b[0-9]+\\b"
 
+    - comment:
+        start: "(^\"|[ \t]+\" |[ \t]+\"$)"
+        end: "$"
+        rules: []
+
     - constant.string:
         start: "\""
         end: "\""
@@ -23,10 +29,3 @@ rules:
         skip: "\\\\."
         rules:
             - constant.specialChar: "\\\\."
-
-    - comment:
-        start: "\""
-        end: "$"
-        rules: []
-        
-