Command-Line Manipulator of 𝜑-Calculus Expressions

This is a command-line normalizer, rewriter, and dataizer of 𝜑-calculus expressions.

First, you write a simple 𝜑-calculus program in the hello.phi file:

Φ ↦ ⟦ φ ↦ ⟦ Δ ⤍ 68-65-6C-6C-6F ⟧, t ↦ ξ.k, k ↦ ⟦⟧ ⟧

Installation

Then you can install phino in two ways:

Install Cabal first and then:

cabal update
cabal install --overwrite-policy=always phino-0.0.0.40
phino --version

Or download binary from the internet using curl or wget:

sudo curl -o /usr/local/bin/phino http://phino.objectionary.com/releases/macos-15/phino-latest
sudo chmod +x /usr/local/bin/phino
phino --version

Download paths are:

• Ubuntu: http://phino.objectionary.com/releases/ubuntu-24.04/phino-latest
• MacOS: http://phino.objectionary.com/releases/macos-15/phino-latest

Dataize

Then, you dataize the program:

$ phino dataize hello.phi
68-65-6C-6C-6F

Rewrite

You can rewrite this expression with the help of rules defined in the my-rule.yml YAML file (here, the !d is a capturing group, similar to regular expressions):

name: My custom rule
pattern: Δ ⤍ !d
result: Δ ⤍ 62-79-65

Then, rewrite:

$ phino rewrite --rule=my-rule.yml hello.phi
Φ ↦ ⟦ φ ↦ ⟦ Δ ⤍ 62-79-65 ⟧, t ↦ ξ.k, k ↦ ⟦⟧ ⟧

If you want to use many rules, just use --rule as many times as you need:

phino rewrite --rule=rule1.yaml --rule=rule2.yaml ...

If no input file is provided, the 𝜑-expression is taken from stdin:

$ echo 'Φ ↦ ⟦ φ ↦ ⟦ Δ ⤍ 68-65-6C-6C-6F ⟧ ⟧' | phino rewrite --rule=my-rule.yml
Φ ↦ ⟦ φ ↦ ⟦ Δ ⤍ 62-79-65 ⟧ ⟧

You can also use built-in rules, which are designed to normalize expressions:

phino rewrite --normalize hello.phi

Also phino supports 𝜑-expressions in ASCII format and with syntax sugar. The rewrite command also allows you to desugar the expression and print it in canonical syntax:

$ echo 'Q -> [[ @ -> QQ.io.stdout("hello") ]]' | phino rewrite --nothing
Φ ↦ ⟦
  φ ↦ Φ.org.eolang.io.stdout(
    α0 ↦ Φ.org.eolang.string(
      α0 ↦ Φ.org.eolang.bytes(
        α0 ↦ ⟦ Δ ⤍ 68-65-6C-6C-6F ⟧
      )
    )
  )
⟧

For more details, use --help option.

Rule structure

This is BNF-like yaml rule structure. Here types ended with apostrophe, like Attribute' are built types from 𝜑-program AST

Rule:
  name: String?
  pattern: String
  result: String
  when: Condition?       # predicate, works with substitutions before extension
  where: [Extension]?    # substitution extensions
  having: Condition?     # predicate, works with substitutions after extension

Condition:
  = and: [Condition]     # logical AND
  | or:  [Condition]     # logical OR
  | not: Condition       # logical NOT
  | alpha: Attribute'    # check if given attribute is alpha
  | eq:                  # compare two comparable objects
      - Comparable
      - Comparable
  | in:                  # check if attributes exist in bindings
      - Attribute'
      - Binding'
  | nf: Expression'      # returns True if given expression in normal form
                         # which means that no more other normalization rules
                         # can be applied
  | xi: Expression'      # special condition for Rcopy normalization rule to 
                         # avoid infinite recursion while the condition checking
                         # returns True if there's no ξ outside of the formation
                         # in given expression.
  | matches:             # returns True if given expression after dataization
      - String           # matches to given regex
      - Expression
  | part-of:             # returns True if given expression is attached to any
      - Expression'      # attribute in ginve bindings
      - BiMeta'

Comparable:              # comparable object that may be used in 'eq' condition
  = Attribute'
  | Number
  | Expression'

Number:                  # comparable number
  = Integer              # just regular integer
  | ordinal: Attribute'  # calculate index of alpha attribute
  | length: BiMeta'      # calculate length of bindings by given meta binding

Extension:               # substitutions extension used to introduce new meta variables
  meta: [ExtArgument]    # new introduced meta variable
  function: String       # name of the function
  args: [ExtArgument]    # arguments of the function

ExtArgument
  = Bytes'               # !d
  | Binding'             # !B
  | Expression'          # !e
  | Attribute'           # !a

Here's list of functions that are supported for extensions:

• contextualize - function of two arguments, that rewrites given expression depending on provided context according to the contextualization rules
• scope - resolves the scope for given expression. Works only with meta expressions denotes as 𝑒 or !e. The scope is nearest outer formation, if it's present. In all other cases the default scope is used, which is anonymous formation ⟦ ρ ↦ ∅ ⟧.
• random-tau - creates attribute with random unique name. Accepts bindings, and attributes. Ensures that created attribute is not present in list of provided attributes and does not exist as attribute in provided bindings.
• dataize - dataizes given expression and returns bytes.
• concat - accepts bytes or dataizable expressions as arguments, concatenates them into single sequence and convert it to expression that can be pretty printed as human readable string: Φ.org.eolang.string(Φ.org.eolang.bytes⟦ Δ ⤍ !d ⟧).
• sed - pattern replacer, works like unix sed function. Accepts two arguments: target expression and pattern. Pattern must start with s/, consists of three parts separated by /, for example, this pattern s/\\s+//g replaces all the spaces with empty string. To escape braces and slashes in pattern and replacement parts - use them with \\, e.g. s/\\(.+\\)//g.
• random-string - accepts dataizable expression or bytes as pattern. Replaces %x and %d formatters with random hex numbers and decimals accordingly. Uniqueness is guaranteed during one execution of phino.
• size - accepts exactly one meta binding and returns size of it and Φ̇.number.
• tau - accepts Φ̇.string, dataizes it and converts it to attribute. If dataized string can't be converted to attribute - an error is thrown.
• string - accepts Φ̇.string or Φ̇.number or attribute and converts it to Φ̇.string.

Meta variables

The phino supports meta variables to write 𝜑-expression patterns for capturing attributes, bindings, etc.

This is the list of supported meta variables:

• !a || 𝜏 - attribute
• !e || 𝑒 - any expression
• !B || 𝐵 - list of bindings
• !d || δ - bytes in meta delta binding
• !t - tail after expression, sequence of applications and/or dispatches, must start only with dispatch
• !F - function name in meta lambda binding

Every meta variable may also be used with an integer index, like !B1 or 𝜏0.

Incorrect usage of meta variables in 𝜑-expression patterns leads to parsing errors.

How to Contribute

Fork repository, make changes, then send us a pull request. We will review your changes and apply them to the master branch shortly, provided they don't violate our quality standards. To avoid frustration, before sending us your pull request please make sure all your tests pass:

cabal build all
make

To generate a local coverage report for development, run:

cabal test --enable-coverage

You will need GHC and Cabal ≥3.0 or Stack ≥ 3.0 installed.