vim: import peg.vim from https://github.com/gf3/peg.vim

Signed-off-by: Alejandro Mery <amery@hanoverdisplays.com>

files/.vim/ftdetect/peg.vim

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+au BufRead,BufNewFile *.peg set ft=peg

files/.vim/syntax/peg.vim

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+" Vim syntax file
+" Language: Parser Expression Grammars (PEG)
+" Maintainer: Gianni Chiappetta
+" Latest Revision: 2011-02-08
+
+if exists("b:current_syntax")
+  finish
+endif
+
+syn match   pegRuleIdentifier   /^\a\+/ skipwhite nextgroup=pegSeperator
+
+syn match   pegSeperator        "<-" skipwhite contained nextgroup=pegExpression
+syn match   pegSeperator        "←" skipwhite contained nextgroup=pegExpression
+
+syn match   pegExpression       /.*/ contained skipwhite contains=pegDelimiter,pegGrouping,pegSpecial,pegRange,pegTerminal,pegOrderedChoice,pegNonTerminal,pegQuantifier
+syn match   pegDelimiter        /[§]/ contained display
+syn region  pegGrouping         matchgroup=pegDelimiter start=/(/ end=/)/ contained skipwhite keepend contains=pegExpression display
+syn match   pegSpecial          /[!&ϵ^]/ contained display
+syn match   pegOrderedChoice    /\// contained display
+syn region  pegRange            matchgroup=pegDelimiter start=/\[^/ start=/\[/ end=/\]/ contained skipwhite contains=pegRangeValue,pegUnicode display
+syn match   pegRangeValue       /\d\+-\d\+/ contained display
+syn match   pegRangeValue       /\a\+-\a\+/ contained display
+syn region  pegTerminal         matchgroup=pegDelimiter start=/"/ end=/"/ contained display
+syn region  pegTerminal         matchgroup=pegDelimiter start=/'/ end=/'/ contained display
+syn match   pegUnicode          /U+[A-F0-9]\{4,6}/ contained display
+syn match   pegNonTerminal      /\a+/ contained display
+syn match   pegQuantifier       /[+\*?]/ contained display
+syn match   pegQuantifier       /{\d\+,\d\+}/ contained display
+syn match   pegQuantifier       /{\d\+}/ contained display
+
+syn match   pegComment          /;.*$/ contains=pegTodo
+syn keyword pegTodo             TODO FIXME XXX NOTE contained
+
+hi link pegRuleIdentifier Identifier
+hi link pegSeperator      Conditional
+hi link pegDelimiter      Delimiter
+hi link pegSpecial        Special
+hi link pegOrderedChoice  Conditional
+hi link pegComment        Comment
+hi link pegRangeValue     Constant
+hi link pegTerminal       String
+hi link pegUnicode        Constant
+hi link pegQuantifier     Function
+hi link pegTodo           Todo
+
+let b:current_syntax = "peg"
+