## D syntax highlighting for GNU nano
##
## Author: Andrei Vinokurov
## Based on D lexer specification (http://dlang.org/lex)
## Updated by Dejan Lekic - note: it is optimised for black background!

syntax "d" "\.(d(i|d)?)$"

## Operators and punctuation
color green "(\*|/|%|\+|-|>>|<<|>>>|&|\^(\^)?|\||~)?="
color green "\.\.(\.)?|!|\*|&|~|\(|\)|\[|\]|\\|/|\+|-|%|<|>|\?|:|;"

## Octal integer literals are deprecated
color ,red "(0[0-7_]*)(L[uU]?|[uU]L?)?"

## Decimal integer literals
color brightyellow "([0-9]|[1-9][0-9_]*)(L[uU]?|[uU]L?)?"

## Binary integer literals
color brightgreen "(0[bB][01_]*)(L[uU]?|[uU]L?)?"

## Decimal float literals
color brightblue "[0-9][0-9_]*\.([0-9][0-9_]*)([eE][+-]?([0-9][0-9_]*))?[fFL]?i?"
color brightblue "[0-9][0-9_]*([eE][+-]?([0-9][0-9_]*))[fFL]?i?"
color brightblue "[^.]\.([0-9][0-9_]*)([eE][+-]?([0-9][0-9_]*))?[fFL]?i?"
color brightblue "[0-9][0-9_]*([fFL]?i|[fF])"

## Identifiers
color white "\<[[:alpha:]_][[:alnum:]_]*\>"

## Hexadecimal integer literals
color brightcyan "(0[xX]([0-9a-fA-F][0-9a-fA-F_]*|[0-9a-fA-F_]*[0-9a-fA-F]))(L[uU]?|[uU]L?)?"

## Hexadecimal float literals
color blue "0[xX]([0-9a-fA-F][0-9a-fA-F_]*|[0-9a-fA-F_]*[0-9a-fA-F])(\.[0-9a-fA-F][0-9a-fA-F_]*|[0-9a-fA-F_]*[0-9a-fA-F])?[pP][+-]?([0-9][0-9_]*)[fFL]?i?"
color blue "0[xX]\.([0-9a-fA-F][0-9a-fA-F_]*|[0-9a-fA-F_]*[0-9a-fA-F])[pP][+-]?([0-9][0-9_]*)[fFL]?i?"


## Character literals
color brightmagenta "'([^\']|\\(['"?\abfnrtv]|x[[:xdigit:]]{2}|[0-7]{1,3}|u[[:xdigit:]]{4}|U[[:xdigit:]]{8}|&.*;))'"

## Keywords
## a-e
color brightwhite "\<(abstract|alias|align|asm|assert|body|break|case|cast|catch|class|const|continue|debug|default|delegate|do|else|enum|export|extern)\>"
## f-l
color brightwhite "\<(false|final|finally|for|foreach|foreach_reverse|function|goto|if|import|in|inout|interface|invariant|is|lazy)\>"
## m-r
color brightwhite "\<(macro|mixin|module|new|nothrow|null|out|override|package|pragma|private|protected|public|pure|ref|return)\>"
## s-w
color brightwhite "\<(scope|shared|static|struct|super|switch|synchronized|template|this|throw|true|try|union|unittest|version|while|with)\>"
## __
color brightwhite "\<(__FILE__|__MODULE__|__LINE__|__FUNCTION__|__PRETTY_FUNCTION__|__gshared|__traits|__vector|__parameters)\>"

## Deprecated keywords
color ,green "\<(delete|deprecated|typedef|volatile)\>"

## Primitive types
color brightgreen "\<(bool|byte|cdouble|cent|cfloat|char|creal|dchar|double|float|idouble|ifloat|int|ireal|long|real|short|ubyte|ucent|uint|ulong|ushort|void|wchar)\>"

## Type-related symbols
color brightgreen "\<(auto|immutable|typeid|typeof)\>"

## Globally defined symbols
color brightgreen "\<(string|wstring|dstring|size_t|ptrdiff_t)\>"

## Special tokens
color ,blue "\<(__DATE__|__EOF__|__TIME__|__TIMESTAMP__|__VENDOR__|__VERSION__)\>"


## Special directives, etc.
color magenta "\\s *#\\s *"

## String literals
## TODO: multiline backtick and doublequote string. (Unlikely possible at all with nano.)
### DoubleQuotedString
color yellow ""([^"\]|\\(['"?\abfnrtv]|x[[:xdigit:]]{2}|[0-7]{1,3}|u[[:xdigit:]]{4}|U[[:xdigit:]]{8}|&.*;)))*""
 
### WysiwygString
color yellow start="r"" end="""
color yellow "`[^`]*`"

### HexString
color ,yellow "x"([[:space:]]*[[:xdigit:]][[:space:]]*[[:xdigit:]])*[[:space:]]*""

### DelimitedString
color yellow "q"\(.*\)""
color yellow "q"\{.*\}""
color yellow "q"\[.*\]""
color yellow "q"<.*>""
color yellow start="q"[^({[<"][^"]*$" end="^[^"]+""
color yellow "q"([^({[<"]).*\1""

### TokenString
### True token strings require nesting, so, again, they can't be implemented accurately here.
### At the same time, the intended purpose of token strings makes it questionable to highlight them as strings at all.
## color ,magenta start="q\{" end="\}"

## Comments
## NB: true nested comments are impossible to implement with plain regex
color normal "//.*"
color normal start="/\*" end="\*/"
color normal start="/\+" end="\+/"

## Trailing whitespace
color ,green "[[:space:]]+$"