1 constant NUM_TYPE_SINGLE
2 constant NUM_TYPE_DOUBLE
+\ Like >number, but temporarily switch BASE.
+: (>number-with-base) ( ud c-addr u base -- ud' c-addr' u' )
+ base @ >r base ! >number r> base !
+;
+
\ This is similar to the F83 NUMBER? except that it returns a number type
\ and then either a single or double precision number.
: ((NUMBER?)) ( c-addr u -- 0 | n 1 | d 2 , convert string to number )
dup 0= IF 2drop NUM_TYPE_BAD exit THEN \ any chars?
-\ prepare for >number
- 0 0 2swap ( 0 0 c-addr cnt )
+ base @ -rot ( base c-addr u )
+
+ \ Regonize prefixes and change base if needed
+ over c@ >r ( base c-addr u ) ( r: char )
+ r@ [char] # = if rot drop 10 -rot 1 /string then
+ r@ [char] $ = if rot drop 16 -rot 1 /string then
+ r@ [char] % = if rot drop 2 -rot 1 /string then
+ r@ [char] ' = if
+ \ Recognize '<char>'
+ dup 3 = if
+ over 2 chars + c@ [char] ' = if
+ drop nip rdrop
+ char+ c@ NUM_TYPE_SINGLE exit
+ then
+ then
+ then
+ r> drop
\ check for '-' at beginning, skip if present
over c@ ascii - = \ is it a '-'
dup >r \ save flag
- IF 1- >r 1+ r> ( -- 0 0 c-addr+1 cnt-1 , skip past minus sign )
+ IF 1 /string ( -- base c-addr+1 cnt-1 , skip past minus sign )
THEN
-\
- >number dup 0= \ convert as much as we can
+
+ ( base c-addr cnt ) ( r: minus-flag )
+ rot >r 0 0 2swap r>
+ (>number-with-base) dup 0= \ convert as much as we can
IF
2drop \ drop addr cnt
drop \ drop hi part of num