lark.vim

if exists("b:current_syntax")
  finish
endif

"To do : 
"- disable higlight on pattern_group for ()[]{} if there are preseded by \

syn match regex_symbols /\(\(\\\)\@<=\(\\\\\)*\)\@<!\(+\|(\|)\|{\|}\|\[\|\]\|+\|\*\|?\|\.\|\^\|\$\||\)/
syn keyword pattern_agroup /
syn match statement +^\s*%\(ignore\|import\|declare\|override\|extend\)+
syn match rule			"^\s*\(!\?\)\([_?]\)\?\l\(\l\|[_0-9]\)*" 
syn match token  "^\s*\(_\?\)\u\(_\|\u\|\d\)*"
syn match inner_token "\(\l\|\u\|_\)\@<!\(_\?\)\u\(_\|\u\|\d\)\+"
syn match separators +|\|:\|\(->\)+
syn match agroup     +"\|(\|)\|{\|}\|\[\|\]+
syn match template_symbols +\,+
syn region template start="{" end="}" contains=template_symbols
"The pattern \(\\\)\@<!\(\\\\\)*\\/ match a odd count
"of '\'  non preceded by '\'
"syn region pattern matchgroup=pattern_agroup  start="/\(/\)\@!" end="/\|\n" skip="\(\\\)\@<!\(\\\\\)*\\/" contains=agroup
"syn region string matchgroup=agroup  start='"' end='"\|\n' skip='\(\\\)\@<!\(\\\\\)*\\"'
syn region pattern matchgroup=pattern_agroup start="/" end="/" skip="\\." contains=regex_symbols
syn region string matchgroup=agroup  start='"' end='"\|\n' skip='\\.'

"Comment needs to be matched **after** REGEX Patterns otherwise comments are
"highlighted as an empty regex pattern followed by tokens
syn region comment start="//\|#" end="$"


let b:current_syntax = "lark"

hi def link statement   Statement
hi def link rule				Identifier
hi def link token				Type
hi def link inner_token        Type
hi def link separators  Operator 
hi def link agroup			Operator
hi def link regex_symbols			Operator
hi def link pattern_agroup Operator
hi def link comment     Comment
hi def link pattern			String 
hi def link string      String
hi def link template_symbols Operator
hi def link template    Delimiter