exptokΒΆ
exptok splits a simple arithmetic expression into tokens.
-
ssToks = exptok(ssExpression)
Return Value
ssToks is a string of tokens. In case of an error ssToks is a number
containing the position of the error in ssExpression.The tokens are separated
by the character \2
. A token consists of a type and the token string. The
type and the token string are separated by the character \1
.
The following token types exist:
Type Value | Meaning |
---|---|
F$n | Value is a function call. n is the number of parameters. |
V | Variable name. |
O | Operator + - \ * / ^ . |
S | String |
N | Number |
C | Parenthesis ( or ) or Comma , . |
Parameters
-
ssExpression
ssExpression is an arithmetic expression. The following elements are allowed in the expression: Operators:
+,-,*,/,^
Parenthesis:(
und)
Function names, variable names, string contants enclosed in"
-characters, also Strings and numbers of the form 1, 1.2, 1.2e3, -1.2e-3 Functions can have an empty parameter list as inprint()
or a list of parameters separated by a comma (,
).
Example
toks = exptok("3 * sin(2.3) + abc / 1");
* toks
N3O*F$1sinC(N2.3C)O+VabcO/N1
* toks = strtok(toks, "\1\2");
* toks'
N
3
O
*
F$1
sin
C
(
N
2.3
C
)
O
+
V
abc
O
/
N
1
See also
id-285600