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Merge pull request #27 from nineties/escaped-char

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Support escaped character in s"
This commit is contained in:
Koichi NAKAMURA 2021-12-09 08:49:31 +09:00 committed by GitHub
commit 18d4bad843
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 36 additions and 3 deletions
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36
bootstrap.fs
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@ -576,7 +576,16 @@ allot-cell : &find! [ ' L , , ] ; \ ( c-addr -- nt ) Throw exception at error
: 3 [ key 3 key 0 - ] literal ;
: 4 [ key 4 key 0 - ] literal ;
: 5 [ key 5 key 0 - ] literal ;
: 6 [ key 6 key 0 - ] literal ;
: 7 [ key 7 key 0 - ] literal ;
: 8 [ key 8 key 0 - ] literal ;
: 9 [ key 9 key 0 - ] literal ;
: 10 [ key : key 0 - ] literal ;
: 11 [ key ; key 0 - ] literal ;
: 12 [ key < key 0 - ] literal ;
: 13 [ key = key 0 - ] literal ;
: 14 [ key > key 0 - ] literal ;
: 15 [ key ? key 0 - ] literal ;
: 16 [ key @ key 0 - ] literal ;
: -1 [ key 0 key 1 - ] literal ;
@ -1045,6 +1054,14 @@ decimal \ set default to decimal
: '%' [char] % ;
: '$' [char] $ ;
: '\'' [char] ' ;
: '\\' [char] \ ;
: 'a' [char] a ;
: 'b' [char] b ;
: 't' [char] t ;
: 'n' [char] n ;
: 'v' [char] v ;
: 'f' [char] f ;
: 'r' [char] r ;
\ Display unsigned integer u2 with number base u1.
: print-uint ( u1 u2 -- )
@ -1298,6 +1315,22 @@ create s-buffer s-buffer-size allot
\ because we can't write string literal yet.
char 0 char B - constant STRING-OVERFLOW-ERROR \ -18
\ Return ascii-code of corresponding escaped char
\ e.g '\n' escaped-char -> 10
: escaped-char ( n -- n )
case
'0' of 0 endof
'a' of 7 endof
'b' of 8 endof
't' of 9 endof
'n' of 10 endof
'v' of 11 endof
'f' of 12 endof
'r' of 13 endof
drop -1
endcase
;
\ Parse string delimited by "
\ compile mode: the string is stored as operand of 'string' operator.
\ immediate mode: the string is stored to temporary buffer.
@ -1307,6 +1340,7 @@ char 0 char B - constant STRING-OVERFLOW-ERROR \ -18
here 0 , \ save location of length and fill dummy
0 \ length of the string + 1 (\0)
begin key! dup '"' <> while
dup '\\' = if drop key! escaped-char then
c, \ store character
1+ \ increment length
repeat drop
@ -1317,7 +1351,7 @@ char 0 char B - constant STRING-OVERFLOW-ERROR \ -18
else
s-buffer dup \ save start address
begin key! dup '"' <> while
( buf pos c pos-buf )
dup '\\' = if drop key! escaped-char then
over 3 pick - s-buffer-size 1- >= if
STRING-OVERFLOW-ERROR throw
then

3
test/fileio.fs
View file

@ -9,7 +9,6 @@ T{
}T
T{ 32 allocate throw constant BUF -> }T
T{ BUF 32 FILE0 read-file throw -> 27 }T
T{ s" ABCDEFGHIJKLMNOPQRSTUVWXYZ
" BUF 27 strneq -> true }T
T{ s" ABCDEFGHIJKLMNOPQRSTUVWXYZ\n" BUF 27 strneq -> true }T
T{ FILE0 close-file throw -> }T
T{ BUF free -> }T