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modern: use lexer instead of `n string`.

locals-and-roots
Doug Coleman 2016-06-19 11:47:06 -07:00
parent 721434cb44
commit dda8add101
2 changed files with 97 additions and 73 deletions
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23
core/modern/lexer/lexer.factor
View File

@ -1,7 +1,7 @@
! Copyright (C) 2016 Doug Coleman.
! See http://factorcode.org/license.txt for BSD license.
USING: accessors constructors kernel math sequences
sequences.extras slots.syntax ;
sequences.extras slots.syntax unicode ;
in: modern.lexer
TUPLE: modern-lexer n string stack ;
@ -11,6 +11,16 @@ CONSTRUCTOR: <modern-lexer> modern-lexer ( string -- obj )
: >lexer< ( lexer -- n string ) slots[ n string ] ;
: ?lexer-nth ( lexer -- obj )
>lexer< over [ ?nth ] [ 2drop f ] if ;
ERROR: unexpected-end n string ;
: nth-check-eof ( n string -- nth )
2dup ?nth [ 2nip ] [ unexpected-end ] if* ; inline
: lexer-nth-check-eof ( lexer -- nth )
>lexer< nth-check-eof ;
:: slice-til-either ( n string tokens -- n'/f string slice/f ch/f )
n [
n string '[ tokens member? ] find-from
@ -115,3 +125,14 @@ ERROR: subseq-expected-but-got-eof n string expected ;
lexer
n' >>n drop
n' string' payload closing ;
: find-from* ( ... n seq quot: ( ... elt -- ... ? ) -- ... i elt ? )
[ find-from ] keep
pick [ drop t ] [ length -rot nip f ] if ; inline
: skip-blank-from ( n string -- n' string )
[ [ blank? not ] find-from* 2drop ] keep ; inline
: skip-blanks ( lexer -- lexer )
dup >lexer< skip-blank-from drop >>n ; inline

147
core/modern/modern.factor
View File

@ -4,7 +4,7 @@ USING: accessors arrays assocs assocs.extras combinators
combinators.short-circuit constructors continuations fry
io.encodings.utf8 io.files kernel locals macros make math
math.order modern.paths modern.slices multiline namespaces
quotations sequences sequences.extras splitting
quotations sequences sequences.extras splitting modern.lexer
splitting.monotonic strings unicode generalizations ;
in: modern
@ -203,39 +203,37 @@ ERROR: mismatched-closing opening closing ;
delimiter 1array >>seq
delimiter >>underlying ; inline
ERROR: long-opening-mismatch tag open n string ch ;
ERROR: long-opening-mismatch tag open lexer ch ;
! (( )) [[ ]] {{ }}
MACRO:: read-double-matched ( open-ch -- quot: ( n string tag ch -- n' string seq ) )
MACRO:: read-double-matched ( open-ch -- quot: ( lexer tag ch -- seq ) )
open-ch dup matching-delimiter {
[ drop 2 swap <string> ]
[ drop 1string ]
[ nip 2 swap <string> ]
} 2cleave :> ( openstr2 openstr1 closestr2 )
|[ n string tag! ch |
|[ lexer tag! ch |
ch {
{ char: = [
n string openstr1 slice-til-separator-inclusive [ -1 modify-from ] dip :> ( n' string' opening ch )
ch open-ch = [ tag openstr2 n string ch long-opening-mismatch ] unless
lexer openstr1 lex-til-separator-inclusive [ -1 modify-from ] dip :> ( n' string' opening ch )
ch open-ch = [ tag openstr2 lexer ch long-opening-mismatch ] unless
opening matching-delimiter-string :> needle
n' string' needle slice-til-string :> ( n'' string'' payload closing )
n'' string
lexer needle lex-til-string :> ( n'' string'' payload closing )
payload closing tag opening double-matched-literal make-matched-literal
] }
{ open-ch [
tag 1 cut-slice* swap tag! 1 modify-to :> opening
n 1 + string closestr2 slice-til-string :> ( n' string' payload closing )
n' string
lexer [ 1 + ] change-n closestr2 lex-til-string :> ( n' string' payload closing )
payload closing tag opening double-matched-literal make-matched-literal
] }
[ [ tag openstr2 n string ] dip long-opening-mismatch ]
[ [ tag openstr2 lexer ] dip long-opening-mismatch ]
} case
] ;
: read-double-matched-paren ( n string tag ch -- n' string seq ) char: \( read-double-matched ;
: read-double-matched-bracket ( n string tag ch -- n' string seq ) char: \[ read-double-matched ;
: read-double-matched-brace ( n string tag ch -- n' string seq ) char: \{ read-double-matched ;
: read-double-matched-paren ( lexer tag ch -- seq ) char: \( read-double-matched ;
: read-double-matched-bracket ( lexer tag ch -- seq ) char: \[ read-double-matched ;
: read-double-matched-brace ( lexer tag ch -- seq ) char: \{ read-double-matched ;
defer: lex
defer: lex-factor
@ -249,11 +247,11 @@ ERROR: lex-expected-but-got-eof n string quot ;
ERROR: unnestable-form n string obj ;
! For implementing [ { (
: lex-until ( n string tags -- n' string payload closing )
: lex-until ( lexer tags -- payload closing )
! 3 npick [ lex-expected-but-got-eof ] unless
'[
[
lex-factor [
_ lex-factor [
! [ _ _ _ lex-expected-but-got-eof ] unless*
dup tag-literal? [
dup ,
@ -266,38 +264,41 @@ ERROR: unnestable-form n string obj ;
] loop
] { } make unclip-last ; inline
MACRO:: read-matched ( ch -- quot: ( n string tag -- n' string slice' ) )
MACRO:: read-matched ( ch -- quot: ( lexer tag -- slice' ) )
ch dup matching-delimiter {
[ drop "=" swap prefix ]
[ nip 1string ]
} 2cleave :> ( openstreq closestr1 ) ! [= ]
|[ n string tag |
n string tag
2over nth-check-eof {
{ [ dup openstreq member? ] [ ch read-double-matched ] } ! (=( or ((
{ [ dup blank? ] [ drop dup '[ _ matching-delimiter-string closestr1 2array lex-until ] dip 1 cut-slice* single-matched-literal make-matched-literal ] } ! ( foo )
[ drop [ slice-til-whitespace drop ] dip span-slices make-tag-literal ] ! (foo)
|[ lexer tag |
lexer tag
over lexer-nth-check-eof {
{ [ dup openstreq member? ] [ ch read-double-matched ] } ! (=( or ((
{ [ dup blank? ] [ drop dup '[ _ matching-delimiter-string closestr1 2array lex-until ] dip 1 cut-slice* single-matched-literal make-matched-literal ] } ! ( foo )
[ drop [ lex-til-whitespace drop 2nip ] dip span-slices make-tag-literal ] ! (foo)
} cond
] ;
: read-bracket ( n string slice -- n' string slice' ) char: \[ read-matched ;
: read-brace ( n string slice -- n' string slice' ) char: \{ read-matched ;
: read-paren ( n string slice -- n' string slice' ) char: \( read-matched ;
: read-bracket ( lexer slice -- slice' ) char: \[ read-matched ;
: read-brace ( lexer slice -- slice' ) char: \{ read-matched ;
: read-paren ( lexer slice -- slice' ) char: \( read-matched ;
: read-string-payload ( n string -- n' string )
over [
{ char: \\ char: \" } slice-til-separator-inclusive {
{ f [ drop ] }
{ char: \" [ drop ] }
{ char: \\ [ drop next-char-from drop read-string-payload ] }
:: read-string-payload ( lexer -- n' string slice )
lexer dup ?lexer-nth [
{ char: \\ char: \" } lex-til-separator-inclusive :> ( n' string' slice ch )
ch {
{ f [ n' string' slice ] }
{ char: \" [ n' string' slice ] }
{ char: \\ [ lexer [ 1 + ] change-n read-string-payload ] }
} case
] [
string-expected-got-eof
lexer >lexer< f string-expected-got-eof
] if ;
:: read-string ( n string tag -- n' string seq )
n string read-string-payload drop :> n'
n' string
:: read-string ( lexer tag -- seq )
lexer n>> :> n
lexer read-string-payload :> ( n' string slice )
! n' string
n' [ n string string-expected-got-eof ] unless
n n' 1 - string <slice>
n' 1 - n' string <slice>
@ -306,78 +307,79 @@ MACRO:: read-matched ( ch -- quot: ( n string tag -- n' string slice' ) )
ERROR: cannot-nest-upper-colon n string string' ;
: read-upper-colon ( n string string' -- n' string obj )
: read-upper-colon ( lexer string' -- obj )
! 4 npick 0 > [ cannot-nest-upper-colon ] when
dup [ scoped-colon-name [ but-last ";" append ";" 2array ] [ ";" 1array ] if* lex-until ] dip
1 cut-slice* uppercase-colon-literal make-matched-literal ;
: read-lower-colon ( n string string' -- n' string obj )
: read-lower-colon ( lexer string' -- obj )
[ lex-factor dup ] dip 1 cut-slice*
lowercase-colon-literal make-delimited-literal ;
! : foo: :foo foo:bar foo:BAR: foo:bar: :foo:
: read-colon ( n string slice -- n' string colon )
merge-slice-til-whitespace {
: read-colon ( lexer slice -- colon )
dupd merge-lex-til-whitespace {
{ [ dup length 1 = ] [ read-upper-colon ] }
{ [ dup [ char: \: = ] all? ] [ read-upper-colon ] }
{ [ dup { [ ":" head? ] [ ":" tail? ] } 1&& ] [ make-tag-literal ] }
{ [ dup { [ ":" head? ] [ ":" tail? ] } 1&& ] [ nip make-tag-literal ] }
{ [ dup ":" tail? ] [ dup scoped-upper? [ read-upper-colon ] [ read-lower-colon ] if ] }
{ [ dup ":" head? ] [ make-tag-literal ] } ! :foo( ... )
[ make-tag-literal ]
{ [ dup ":" head? ] [ nip make-tag-literal ] } ! :foo( ... )
[ nip make-tag-literal ]
} cond ;
: read-upper-less-than ( n string slice -- n' string less-than )
: read-upper-less-than ( lexer slice -- less-than )
dup [ scoped-less-than-name [ but-last ">" append 1array ] [ ">" 1array ] if* lex-until ] dip
1 cut-slice* less-than-literal make-matched-literal ;
: read-less-than ( n string slice -- n' string less-than )
merge-slice-til-whitespace {
{ [ dup length 1 = ] [ make-tag-literal ] } ! "<"
{ [ dup "<" tail? ] [ dup scoped-upper? [ read-upper-less-than ] [ make-tag-literal ] if ] } ! FOO< or foo<
[ make-tag-literal ]
: read-less-than ( lexer slice -- less-than )
dupd merge-lex-til-whitespace {
{ [ dup length 1 = ] [ nip make-tag-literal ] } ! "<"
{ [ dup "<" tail? ] [ dup scoped-upper? [ read-upper-less-than ] [ nip make-tag-literal ] if ] } ! FOO< or foo<
[ nip make-tag-literal ]
} cond ;
: take-comment ( n string slice -- n' string comment )
2over ?nth char: \[ = [
[ 1 + ] 2dip 2over ?nth read-double-matched-bracket
: take-comment ( lexer slice -- comment )
over ?lexer-nth char: \[ = [
[ [ 1 + ] change-n ] dip over ?lexer-nth read-double-matched-bracket
] [
[ slice-til-eol drop dup ] dip 1 cut-slice* line-comment-literal make-delimited-literal
[ lex-til-eol drop 2nip dup ] dip 1 cut-slice* line-comment-literal make-delimited-literal
] if ;
! Words like append! and suffix! are allowed for now.
: read-exclamation ( n string slice -- n' string obj )
: read-exclamation ( lexer slice -- obj )
dup { [ "!" sequence= ] [ "#!" sequence= ] } 1||
[ take-comment ] [ merge-slice-til-whitespace make-tag-literal ] if ;
[ take-comment ] [ merge-lex-til-whitespace make-tag-literal ] if ;
: read-backtick ( n string opening -- n' string obj )
: read-backtick ( lexer opening -- obj )
[
slice-til-whitespace drop
lex-til-whitespace drop 2nip
dup
] dip 1 cut-slice* backtick-literal make-delimited-literal ;
ERROR: backslash-expects-whitespace slice ;
: read-backslash ( n string slice -- n' string obj )
2over peek-from blank? [
: read-backslash ( lexer slice -- obj )
over ?lexer-nth blank? [
! \ foo, M\ foo
[ skip-blank-from slice-til-whitespace drop dup ] dip 1 cut-slice* backslash-literal make-delimited-literal
[ skip-blanks lex-til-whitespace drop 2nip dup ] dip 1 cut-slice* backslash-literal make-delimited-literal
] [
! M\N
merge-slice-til-whitespace make-tag-literal
merge-lex-til-whitespace make-tag-literal
] if ;
! If the slice is 0 width, we stopped on whitespace.
! Advance the index and read again!
: read-token-or-whitespace ( n string slice -- n' string slice )
[ [ 1 + ] dip lex-factor ]
[ make-tag-literal ] if-empty ;
: read-token-or-whitespace ( lexer slice -- slice )
[ [ 1 + ] change-n lex-factor ]
[ nip make-tag-literal ] if-empty ;
ERROR: mismatched-terminator n string slice ;
: read-terminator ( n string slice -- n' string slice )
: read-terminator ( lexer slice -- slice )
nip
terminator-literal make-tag-class-literal ;
: ?blank? ( ch/f -- blank/f )
@ -386,7 +388,7 @@ ERROR: mismatched-terminator n string slice ;
PRIVATE<
! work on underlying, index is on the @
! @foo
: left-decorator? ( obj -- ? )
: left-decorator? ( slice -- ? )
{
[ char-before-slice ?blank? ]
[ next-char-from-slice ?blank? not ]
@ -401,7 +403,8 @@ PRIVATE<
PRIVATE>
: read-decorator ( n string slice -- n' string obj )
: read-decorator ( lexer slice -- obj )
nip
{
{ [ dup left-decorator? ] [ t make-decorator-sentinel ] }
! { [ dup right-decorator? ] [
@ -423,13 +426,13 @@ COMPILE<
COMPILE>
! 0 "HI: ;" slice-til-either -> 3 "HI: ;" "HI:" CHAR: \:
MACRO: rules>call-lexer ( seq -- quot: ( n/f string -- n'/f string literal ) )
MACRO: rules>call-lexer ( seq -- quot: ( lexer string -- literal ) )
[ lexer-rules>delimiters ]
[
lexer-rules>assoc
{ f [ f like dup [ make-tag-literal ] when ] } suffix
{ f [ nip f like dup [ make-tag-literal ] when ] } suffix
] bi
'[ _ slice-til-either _ case ] ;
'[ dup _ lex-til-either [ 2drop ] 2dip _ case ] ;
CONSTANT: factor-lexing-rules {
T{ line-comment-lexer { generator read-exclamation } { delimiter char: \! } }
@ -454,11 +457,11 @@ CONSTANT: factor-lexing-rules {
T{ whitespace-lexer { generator read-token-or-whitespace } { delimiter char: \n } }
} ;
: lex-factor ( n/f string -- n'/f string literal )
: lex-factor ( lexer -- literal )
factor-lexing-rules rules>call-lexer ;
: string>literals ( string -- sequence )
[ 0 ] dip [ lex-factor ] loop>array 2nip postprocess-lexed ;
<modern-lexer> '[ _ lex-factor ] loop>array postprocess-lexed ;
: path>literals ( path -- sequence )
utf8 file-contents string>literals ;