Foundation.String.Read

Read an Integer from a String

Consume an optional minus sign and many digits until end of string.

Read a Natural from a String

Consume many digits until end of string.

Try to read a Double

Try to read a floating number as a Rational

Note that for safety reason, only exponent between -10000 and 10000 is allowed as otherwise DoS/OOM is very likely. if you don't want this behavior, switching to a scientific type (not provided yet) that represent the exponent separately is the advised solution.

Read an Floating like number of the form:

-

numbers

[

.

numbers

] [ (

e

|

E

) [

-

]

number

]

Call a function with:

• A boolean representing if the number is negative

• The digits part represented as a single natural number (123.456 is represented as 123456)

• The number of digits in the fractional part (e.g. 123.456 => 3)

• The exponent if any

The code is structured as a simple state machine that:

• Optionally Consume a - sign

• Consume number for the integral part

• Optionally

• Consume .

• Consume remaining digits if not already end of string

• Optionally Consume a e or E follow by an optional - and a number