The Text Expression Language

This is a crate contains a parser, execution engine and specification for a super simple language to write readable and memorizable text processing expressions.

This document should be used as specification for language to clarify the development of this package.

Data Types

This Language holds only two data types; strings and integers. Both are used as literals in arguments of attribute statements.

str

A str must use double quotes. So "foo" and "!=$)(j0j0802" are both valid strings. If a double quote occurs inside the string, it can be escaped using \. So strings with escaped double quotes look like this: "\"Quoted Text\"". This is actually all there is to strings. They cant contain any other escaped chars (such as new lines etc.)

int

An ìnt is either a single 0 or 1-9 followed by 0-9 as often as wanted. There are no signed integers.

Queries

Queries indicate the format of a string which gets tested against it. Currently there are 9 Attributes which are specified:

Logical Operators

Currently there are only two binary logical operations: and and or

Examples

1 or 2 parses as (1 or 2)

1 and 2 parses as (1 and 2)

1 and 2 or 3 parses as ((1 and 2) or 3)

1 or 2 and 3 parses as (1 or (2 and 3))

1 and 2 and 3 parses as (1 and (2 and 3))

1 or 2 or 3 parses as (1 or (2 or 3))

1 or 2 or 3 and 4 or 5 parses as (1 or (2 or ((3 and 4) or 5)))))

Groups

Currently not implemented. May come in future versions to enable more complex text processing;