## D syntax highlighting for GNU nano
##
## Author: Andrei Vinokurov
## Based on D lexer specification (http://dlang.org/lex)

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

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

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

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

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

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

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

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

## Deprecated keywords
color error "\b(delete|deprecated|typedef|volatile)\b"

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

## Globally defined symbols
color type "\b(string|wstring|dstring|size_t|ptrdiff_t)\b"

## Special tokens
color constant "\b(__DATE__|__EOF__|__TIME__|__TIMESTAMP__|__VENDOR__|__VERSION__)\b"

## String literals
## TODO: multiline backtick and doublequote string. (Unlikely possible at all with nano.)
### DoubleQuotedString
color constant ""(\\.|[^"])*""
 
### WysiwygString
color constant (s) "r".*?""
color constant "`[^`]*`"

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

### DelimitedString
color constant "q"\(.*\)""
color constant "q"\{.*\}""
color constant "q"\[.*\]""
color constant "q"<.*>""
color constant (s) "q"[^({[<"][^"]*$.*?^[^"]+""
color constant "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 (s) "q\{.*?\}"

## Comments
## NB: true nested brightblacks are impossible to implement with plain regex
color comment "//.*"
color comment (s) "/\*.*?\*/"
color comment (s) "/\+.*?\+/"