Initial implementation

ftdetect/reflow.vim

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+au BufRead,BufNewFile *.rf set filetype=reflow

syntax/reflow.vim

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+" Vim syntax file
+" Language: Reflow
+" Maintainer: [email protected]
+" Latest Revision: 24 July 2020
+" Reference: https://sg.eng.grail.com/grail/grail/-/blob/go/src/github.com/grailbio/reflow/LANGUAGE.md
+
+
+" Language
+syntax keyword reflowKeyword Main val image mem cpu param intern extern
+syntax keyword reflowStatement exec func make reduce panic
+syntax keyword reflowStructure switch case
+syntax match reflowPreprocessor "@\w*"                  " matches the word after '@', like '@requires'
+syntax match reflowPreprocessor "{{.*}}"                " matches these things: '{{out}}'
+
+syntax match swiftOperator "\v\~\>"
+syntax match reflowOperator "\v\s+!"
+syntax match reflowOperator "\v\%"
+syntax match reflowOperator "\v\&"
+syntax match reflowOperator "\v\*"
+syntax match reflowOperator "\v-"
+syntax match reflowOperator "\v\+"
+syntax match reflowOperator "\v\="
+syntax match reflowOperator "\v\|"
+syntax match reflowOperator "\v\/"
+syntax match reflowOperator "\v\<"
+syntax match reflowOperator "\v\>"
+
+" Types
+syntax region reflowString start=/"/ skip=/\\"/ end=/"/ oneline
+syntax match reflowNumber "\v<\d+>"                     " matches whole numbers like 10
+syntax match reflowNumber "\v<\d+\.\d+>"                " matches decimal numbers like 3.14
+syntax match reflowNumber "\v<\d*\.?\d+([Ee]-?)?\d+>"   " matches notation like 3e10, 0.5E-8
+syntax keyword reflowBoolean true false
+syntax keyword reflowConstant KiB MiB GiB TiB
+
+" Comments
+syntax keyword reflowTodo contained TODO todo NOTE note
+syntax match reflowComment "//.*$" contains=reflowTodo
+
+
+
+" Highlighting
+highlight default link reflowKeyword Keyword
+highlight default link reflowStatement Statement
+highlight default link reflowStructure Structure
+highlight default link reflowAttribute PreProc
+highlight default link reflowOperator Operator
+highlight default link reflowImport Include
+highlight default link reflowType Type
+highlight default link reflowPreprocessor PreProc
+
+highlight default link reflowString String
+highlight default link reflowNumber Number
+highlight default link reflowBoolean Boolean
+highlight default link reflowConstant Constant
+
+highlight default link reflowTodo Todo
+highlight default link reflowComment Comment
+
+