Detailed highlighting for numbers
Numbers are highlighted as composed of a sequence of optional components:
- An optional number sign (only for strings which are numbers).
- An integer part
- A decimal point
- A fractional part
- An exponent mark ("E" or "e")
- An exponent sign
- An exponent
Both the integer part and the fractional part are optional, but they cannot both be absent; the last three components form the exponent, which is itself optional; the exponent sign is also optional.
Say 12 + 12.34 - 12e34 * 12e-34 / 12.34e-56
The Parser returns the numbers as single elements, with categories of
.EL.DECIMAL_NUMBER, .EL.INTEGER_NUMBER and
.EL.EXPONENTIAL_NUMBER, and the Highlighter adds details to
these elements, by subdividing the elements into its constituent parts
and assigning or more of the new categories
.EL.NUMBER_SIGN, .EL.INTEGER_PART,
.EL.DECIMAL_POINT, .EL.FRACTIONAL_PART,
.EL.EXPONENT_MARK, .EL.EXPONENT_SIGN and
.EL.EXPONENT, which can be styled individually.
Strings containing numbers (i.e., strings such that
DATATYPE returns "NUM") are highlighted as
numbers. In this case, the number may have an optional sign, which does
not need to be adjacent to the number, and the number may be surrounded
by optional whitespace.
Say - " + 12.34e-56 " -- A string containing a number
This page contains more examples of number and string highlighting.