141 lines
4.0 KiB
Factor
141 lines
4.0 KiB
Factor
! Copyright (C) 2005, 2006 Daniel Ehrenberg
|
|
! See http://factorcode.org/license.txt for BSD license.
|
|
USING: io io.streams.string kernel math namespaces sequences
|
|
strings circular prettyprint debugger ascii ;
|
|
IN: state-parser
|
|
|
|
! * Basic underlying words
|
|
! Code stored in stdio
|
|
! Spot is composite so it won't be lost in sub-scopes
|
|
TUPLE: spot char line column next ;
|
|
|
|
C: <spot> spot
|
|
|
|
: get-char ( -- char ) spot get spot-char ;
|
|
: set-char ( char -- ) spot get set-spot-char ;
|
|
: get-line ( -- line ) spot get spot-line ;
|
|
: set-line ( line -- ) spot get set-spot-line ;
|
|
: get-column ( -- column ) spot get spot-column ;
|
|
: set-column ( column -- ) spot get set-spot-column ;
|
|
: get-next ( -- char ) spot get spot-next ;
|
|
: set-next ( char -- ) spot get set-spot-next ;
|
|
|
|
! * Errors
|
|
TUPLE: parsing-error line column ;
|
|
: <parsing-error> ( -- parsing-error )
|
|
get-line get-column parsing-error construct-boa ;
|
|
|
|
: construct-parsing-error ( ... slots class -- error )
|
|
construct <parsing-error> over set-delegate ; inline
|
|
|
|
: parsing-error. ( parsing-error -- )
|
|
"Parsing error" print
|
|
"Line: " write dup parsing-error-line .
|
|
"Column: " write parsing-error-column . ;
|
|
|
|
TUPLE: expected should-be was ;
|
|
: <expected> ( should-be was -- error )
|
|
{ set-expected-should-be set-expected-was }
|
|
expected construct-parsing-error ;
|
|
M: expected error.
|
|
dup parsing-error.
|
|
"Token expected: " write dup expected-should-be print
|
|
"Token present: " write expected-was print ;
|
|
|
|
TUPLE: unexpected-end ;
|
|
: <unexpected-end> ( -- unexpected-end )
|
|
{ } unexpected-end construct-parsing-error ;
|
|
M: unexpected-end error.
|
|
parsing-error.
|
|
"File unexpectedly ended." print ;
|
|
|
|
TUPLE: missing-close ;
|
|
: <missing-close> ( -- missing-close )
|
|
{ } missing-close construct-parsing-error ;
|
|
M: missing-close error.
|
|
parsing-error.
|
|
"Missing closing token." print ;
|
|
|
|
SYMBOL: prolog-data
|
|
|
|
! * Basic utility words
|
|
|
|
: record ( char -- )
|
|
CHAR: \n =
|
|
[ 0 get-line 1+ set-line ] [ get-column 1+ ] if
|
|
set-column ;
|
|
|
|
: (next) ( -- char ) ! this normalizes \r\n and \r
|
|
get-next read1
|
|
2dup swap CHAR: \r = [
|
|
CHAR: \n =
|
|
[ nip read1 ] [ nip CHAR: \n swap ] if
|
|
] [ drop ] if
|
|
set-next dup set-char ;
|
|
|
|
: next ( -- )
|
|
#! Increment spot.
|
|
get-char [
|
|
<unexpected-end> throw
|
|
] unless
|
|
(next) record ;
|
|
|
|
: next* ( -- )
|
|
get-char [ (next) record ] when ;
|
|
|
|
: skip-until ( quot -- )
|
|
#! quot: ( -- ? )
|
|
get-char [
|
|
[ call ] keep swap [ drop ] [
|
|
next skip-until
|
|
] if
|
|
] [ drop ] if ; inline
|
|
|
|
: take-until ( quot -- string )
|
|
#! Take the substring of a string starting at spot
|
|
#! from code until the quotation given is true and
|
|
#! advance spot to after the substring.
|
|
[ [
|
|
dup slip swap dup [ get-char , ] unless
|
|
] skip-until ] "" make nip ;
|
|
|
|
: rest ( -- string )
|
|
[ f ] take-until ;
|
|
|
|
: take-char ( ch -- string )
|
|
[ dup get-char = ] take-until nip ;
|
|
|
|
: pass-blank ( -- )
|
|
#! Advance code past any whitespace, including newlines
|
|
[ get-char blank? not ] skip-until ;
|
|
|
|
: string-matches? ( string circular -- ? )
|
|
get-char over push-circular
|
|
sequence= ;
|
|
|
|
: take-string ( match -- string )
|
|
dup length <circular-string>
|
|
[ 2dup string-matches? ] take-until nip
|
|
dup length rot length 1- - head
|
|
get-char [ <missing-close> throw ] unless next ;
|
|
|
|
: expect ( ch -- )
|
|
get-char 2dup = [ 2drop ] [
|
|
>r 1string r> 1string <expected> throw
|
|
] if next ;
|
|
|
|
: expect-string ( string -- )
|
|
dup [ drop get-char next ] map 2dup =
|
|
[ 2drop ] [ <expected> throw ] if ;
|
|
|
|
: init-parser ( -- )
|
|
0 1 0 f <spot> spot set
|
|
read1 set-next next ;
|
|
|
|
: state-parse ( stream quot -- )
|
|
! with-stream implicitly creates a new scope which we use
|
|
swap [ init-parser call ] with-stream ; inline
|
|
|
|
: string-parse ( input quot -- )
|
|
>r <string-reader> r> state-parse ; inline
|