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|
.help lexnum 2 "string utilities"
.ih _________________________________________________________________________
NAME
lexnum -- Determine if string is a number
.ih
USAGE
token_type = lexnum (str, ip, nchars)
.ih
PARAMETERS
.ls str
String to be scanned.
.le
.ls ip
Index within the string as which scanning is to start. Not modified.
.le
.ls nchars
On output, the number of characters in the number, not including any
leading whitespace.
.le
.ih
DESCRIPTION
The character string is scanned to determine if the next token is a
legal number, and if so, the type of number. The function value identifies
the type of number. The possible return values, defined in <lexnum.h>,
as as follows:
.nf
LEX_OCTAL (+|-)?[0-7]+[bB]
LEX_DECIMAL (+|-)?[0-9]+
LEX_HEX (+|-)?[0-9a-fA-F]+[xX]
LEX_REAL floating, exponential [eEdD], sexagesimal
LEX_NONNUM not a number
.fi
.ih
IMPLEMENTATION
Numtype is implemented as a finite state automaton. Additional documentation
is provided with the source code.
.ih
SEE ALSO
gctod(2), ctotok(2).
.endhelp ___________________________________________________________________
.help states 2 "States of the LEXNUM Finite State Automaton"
.fi
.ks
.nf
start: (1)
+- shift unop_or_number
0-7 shift odhr
8-9 shift dhr
acf reduce not_a_number
ed reduce not_a_number
: shift maybe_real_number
. shift maybe_real_fraction
x reduce not_a_number
b reduce not_a_number
other reduce not_a_number
.fi
.ke
.ks
.nf
unop_or_number: (+|-) (2)
+- revert
0-7 shift odhr
8-9 shift dhr
acf revert
ed revert
: revert
. shift maybe_real_fraction
x revert
b revert
other revert
.fi
.ke
.ks
.nf
odhr: (+|-)?[0-7] (3)
+- reduce decimal_number
0-7 accept
8-9 shift dhr
acf shift h
ed shift maybe_hex_or_rexp
: shift maybe_real_number
. shift real_fraction
x reduce hex_number
b shift octal_or_hex_number
other reduce decimal_number
.fi
.ke
.ks
.nf
dhr: (+|-)?[0-9]+ (4)
+- reduce decimal_number
0-7 accept
8-9 accept
acf shift h
ed shift maybe_hex_or_rexp
: shift maybe_real_number
. shift real_fraction
x reduce hex_number
b shift h
other reduce decimal_number
.fi
.ke
.ks
.nf
maybe_real_fraction: (+|-)?"." (5)
+- revert
0-7 shift real_fraction
8-9 shift real_fraction
acf revert
ed revert
: revert
. revert
x revert
b revert
other revert
.fi
.ke
.ks
.nf
h: (+|-)?[0-9]*[a-f] (6)
+- revert
0-7 accept
8-9 accept
acf accept
ed accept
: revert
. revert
x reduce hex_number
b accept
other revert
.fi
.ke
.ks
.nf
maybe_hex_or_rexp: (+|-)?[0-9]+[ed] (7)
+- shift maybe_rexp
0-7 shift hex_or_rexp
8-9 shift hex_or_rexp
acf shift h
ed shift h
: revert
. revert
x reduce hex_number
b shift h
other revert
.fi
.ke
.ks
.nf
maybe_real_number: (+|-)?[0-9]*":" (8)
+- revert
0-7 shift r
8-9 shift r
acf revert
ed revert
: accept
. revert
x revert
b revert
other revert
.fi
.ke
.ks
.nf
octal_or_hex_number: (+|-)?[0-7]"b" (9)
+- reduce octal_number
0-7 shift h
8-9 shift h
acf shift h
ed shift h
: reduce octal_number
. reduce octal_number
x reduce hex_number
b shift h
other reduce octal_number
.fi
.ke
.ks
.nf
real_fraction: (+|-)?"."[0-9] (10)
+- reduce real_number
0-7 accept
8-9 accept
acf reduce real_number
ed shift rfr_or_rexp
: reduce real_number
. reduce real_number
x reduce real_number
b reduce real_number
other reduce real_number
.fi
.ke
.ks
.nf
rfr_or_rexp: (+|-)?"."[0-9]+[ed] (11)
+- shift maybe_rexp
0-7 shift rexp
8-9 shift rexp
acf revert
ed revert
: revert
. revert
x revert
b revert
other revert
.fi
.ke
.ks
.nf
maybe_rexp: (+|-)?[0-9]+[ed](+|-) (12)
+- revert
0-7 shift rexp
8-9 shift rexp
acf revert
ed revert
: revert
. revert
x revert
b revert
other revert
.fi
.ke
.ks
.nf
hex_or_rexp: (+|-)?[0-9]+[ed][0-9] (13)
+- reduce real_number
0-7 accept
8-9 accept
acf shift h
ed shift h
: reduce real_number
. reduce real_number
x reduce hex_number
b reduce real_number
other reduce real_number
.fi
.ke
.ks
.nf
r: (+|-)?[0-9]*":"[0-9] (14)
+- reduce real_number
0-7 accept
8-9 accept
acf reduce real_number
ed shift maybe_rexp
: accept
. shift maybe_real_fraction
x reduce real_number
b reduce real_number
other reduce real_number
.fi
.ke
.ks
.nf
rexp: (+|-)?[0-9]+[ed](+|-)[0-9] (15)
+- reduce real_number
0-7 accept
8-9 accept
acf reduce real_number
ed reduce real_number
: reduce real_number
. reduce real_number
x reduce real_number
b reduce real_number
other reduce real_number
.fi
.ke
|
