···
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maintainer: "Enrico Tassi <enrico.tassi@inria.fr>"
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authors: [ "Claudio Sacerdoti Coen" "Enrico Tassi" ]
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license: "LGPL-2.1-or-later"
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homepage: "https://github.com/LPCIC/elpi"
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doc: "https://LPCIC.github.io/elpi/"
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dev-repo: "git+https://github.com/LPCIC/elpi.git"
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bug-reports: "https://github.com/LPCIC/elpi/issues"
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["dune" "subst"] {dev}
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[make "build" "DUNE_OPTS=-p %{name}% -j %{jobs}%"]
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[make "tests" "DUNE_OPTS=-p %{name}%" "SKIP=performance_HO" "SKIP+=performance_FO"] {with-test & os != "macos" & os-distribution != "alpine" & os-distribution != "freebsd"}
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"ocaml" {>= "4.07.0" }
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"ppxlib" {>= "0.12.0" }
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"menhir" {>= "20211230" }
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"ppx_deriving" {>= "4.2"}
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"ANSITerminal" {with-test}
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"cmdliner" {with-test}
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"conf-time" {with-test}
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synopsis: "ELPI - Embeddable λProlog Interpreter"
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ELPI implements a variant of λProlog enriched with Constraint Handling Rules,
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a programming language well suited to manipulate syntax trees with binders.
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ELPI is designed to be embedded into larger applications written in OCaml as
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an extension language. It comes with an API to drive the interpreter and
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with an FFI for defining built-in predicates and data types, as well as
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quotations and similar goodies that are handy to adapt the language to the host
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This package provides both a command line interpreter (elpi) and a library to
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be linked in other applications (eg by passing -package elpi to ocamlfind).
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The ELPI programming language has the following features:
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- Native support for variable binding and substitution, via an Higher Order
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Abstract Syntax (HOAS) embedding of the object language. The programmer
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does not need to care about technical devices to handle bound variables,
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like De Bruijn indices.
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- Native support for hypothetical context. When moving under a binder one can
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attach to the bound variable extra information that is collected when the
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variable gets out of scope. For example when writing a type-checker the
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programmer needs not to care about managing the typing context.
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- Native support for higher order unification variables, again via HOAS.
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Unification variables of the meta-language (λProlog) can be reused to
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represent the unification variables of the object language. The programmer
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does not need to care about the unification-variable assignment map and
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cannot assign to a unification variable a term containing variables out of
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scope, or build a circular assignment.
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- Native support for syntactic constraints and their meta-level handling rules.
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The generative semantics of Prolog can be disabled by turning a goal into a
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syntactic constraint (suspended goal). A syntactic constraint is resumed as
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soon as relevant variables gets assigned. Syntactic constraints can be
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manipulated by constraint handling rules (CHR).
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- Native support for backtracking. To ease implementation of search.
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- The constraint store is extensible. The host application can declare
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non-syntactic constraints and use custom constraint solvers to check their
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- Clauses are graftable. The user is free to extend an existing program by
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inserting/removing clauses, both at runtime (using implication) and at
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"compilation" time by accumulating files.
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ELPI is free software released under the terms of LGPL 2.1 or above."""
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"https://github.com/LPCIC/elpi/releases/download/v1.15.0/elpi-1.15.0.tbz"
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"sha256=be94336e40ea24f0a66819977019f3956192edd8d6f705aff31b2590895780fd"
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"sha512=8f6877f14570eb0ff73b40a41682d39eaaec643251e06a6201e084940707eb812ebe68f115a93b6fd3c0378b272d3164b64c55cf6735d5761876a77ca0e16020"
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x-commit-hash: "0f01538839a6aee7f7d075c8a302e9267d9cc5c3"
anil.recoil.org