" Vim syntax file
" Language:	Io
" Filenames:	*.io
" Maintainers:	Eric Radman <ericshane@eradman.com>
" URL:		http://static.eradman.com/code/io.vim
" Last Change:	2011 Nov 25 - Initial code

" Arguments and grouping
syn match Function "("
syn match Function ")"

" Strings
syn region String start=/"/ skip=/\\./ end=/"/
syn region String start=/"""/ skip=/\\./ end=/"""/

" Assignment, including some possible user-defined operators that end with `=`
" Io supports unicode identifiers, but \w is locale-specific
" \h identifiers may not start with a digit
syn match Define "\h\w* ="me=e-1
syn match Define "\h\w* .="me=e-2
syn match Define "\h\w* ..="me=e-3

" Interacitve mode
syn match Comment "^Io [0-9]\{8\}$"
syn match Comment "^Io> "
syn match Comment "^... "
syn region Comment start="^==> .*" end="^Io> "

" Statement Separation
syn match Delimiter ";"

" Comments
syn region Comment start='#' end='$' keepend
syn region Comment start=/\/\*/ end=/\*\//
syn region Comment start=/\/\// end=/$/ keepend

" Line continuation (adapted from tcl.vim)
syn match Special '\\$'

" Integer number, or floating point number without a dot (adapted from tcl.vim)
syn case ignore
syn match  Number  "\<\d\+\(u\=l\=\|lu\|f\)\>"
"floating point number, with dot, optional exponent
syn match  Number  "\<\d\+\.\d*\(e[-+]\=\d\+\)\=[fl]\=\>"
"floating point number, starting with a dot, optional exponent
syn match  Number  "\.\d\+\(e[-+]\=\d\+\)\=\>"
"floating point number, without dot, with exponent
syn match  Number  "\<\d\+e[-+]\=\d\+[fl]\=\>"
"hex number
syn match  Number  "0x[0-9a-f]\+\(u\=l\=\|lu\)\>"
syn case match


let b:current_syntax = "io"

" vim: ts=8 noet