73 lines
1.7 KiB
Factor
73 lines
1.7 KiB
Factor
! Copyright (C) 2008 Slava Pestov.
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! See http://factorcode.org/license.txt for BSD license.
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USING: kernel assocs namespaces make splitting sequences
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strings math.parser lexer accessors ;
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IN: strings.parser
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ERROR: bad-escape ;
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: escape ( escape -- ch )
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H{
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{ CHAR: a CHAR: \a }
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{ CHAR: e CHAR: \e }
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{ CHAR: n CHAR: \n }
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{ CHAR: r CHAR: \r }
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{ CHAR: t CHAR: \t }
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{ CHAR: s CHAR: \s }
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{ CHAR: \s CHAR: \s }
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{ CHAR: 0 CHAR: \0 }
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{ CHAR: \\ CHAR: \\ }
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{ CHAR: \" CHAR: \" }
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} at [ bad-escape ] unless* ;
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SYMBOL: name>char-hook
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name>char-hook global [
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[ "Unicode support not available" throw ] or
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] change-at
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: unicode-escape ( str -- ch str' )
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"{" ?head-slice [
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CHAR: } over index cut-slice
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[ >string name>char-hook get call ] dip
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rest-slice
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] [
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6 cut-slice [ hex> ] dip
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] if ;
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: next-escape ( str -- ch str' )
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"u" ?head-slice [
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unicode-escape
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] [
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unclip-slice escape swap
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] if ;
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: (parse-string) ( str -- m )
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dup [ "\"\\" member? ] find dup [
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[ cut-slice [ % ] dip rest-slice ] dip
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dup CHAR: " = [
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drop from>>
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] [
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drop next-escape [ , ] dip (parse-string)
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] if
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] [
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"Unterminated string" throw
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] if ;
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: parse-string ( -- str )
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lexer get [
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[ swap tail-slice (parse-string) ] "" make swap
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] change-lexer-column ;
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: (unescape-string) ( str -- str' )
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dup [ CHAR: \\ = ] find [
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cut-slice [ % ] dip rest-slice
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next-escape [ , ] dip
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(unescape-string)
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] [
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drop %
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] if ;
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: unescape-string ( str -- str' )
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[ (unescape-string) ] "" make ;
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