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anil.recoil.org
1opam-version: "2.0"
2maintainer: "Enrico Tassi <enrico.tassi@inria.fr>"
3authors: [ "Claudio Sacerdoti Coen" "Enrico Tassi" ]
4license: "LGPL-2.1-or-later"
5homepage: "https://github.com/LPCIC/elpi"
6doc: "https://LPCIC.github.io/elpi/"
7dev-repo: "git+https://github.com/LPCIC/elpi.git"
8bug-reports: "https://github.com/LPCIC/elpi/issues"
9
10build: [
11 ["dune" "subst"] {dev}
12 ["dune" "build" "-p" name "-j" jobs]
13 [make "tests" "DUNE_OPTS=-p %{name}%" "SKIP=performance_HO" "SKIP+=performance_FO" "SKIP+=elpi_api_performance"] {with-test & os != "macos" & os-distribution != "alpine" & os-distribution != "freebsd"}
14]
15
16depends: [
17 "ocaml" {>= "4.13.0" }
18 "stdlib-shims"
19 "ppxlib" {>= "0.12.0" & < "0.36.0"}
20 "menhir" {>= "20211230" }
21 "re" {>= "1.7.2"}
22 "ppx_deriving" {>= "4.3"}
23 "ANSITerminal" {with-test}
24 "cmdliner" {with-test}
25 "fileutils" {with-test}
26 "dune" {>= "2.8.0"}
27 "conf-time" {with-test}
28 "atdgen" {>= "2.10.0" & < "2.16.0"}
29 "atdts" {>= "2.10.0"}
30 "odoc" {with-doc}
31]
32synopsis: "ELPI - Embeddable λProlog Interpreter"
33description: """
34ELPI implements a variant of λProlog enriched with Constraint Handling Rules,
35a programming language well suited to manipulate syntax trees with binders.
36
37ELPI is designed to be embedded into larger applications written in OCaml as
38an extension language. It comes with an API to drive the interpreter and
39with an FFI for defining built-in predicates and data types, as well as
40quotations and similar goodies that are handy to adapt the language to the host
41application.
42
43This package provides both a command line interpreter (elpi) and a library to
44be linked in other applications (eg by passing -package elpi to ocamlfind).
45
46The ELPI programming language has the following features:
47
48- Native support for variable binding and substitution, via an Higher Order
49 Abstract Syntax (HOAS) embedding of the object language. The programmer
50 does not need to care about technical devices to handle bound variables,
51 like De Bruijn indices.
52
53- Native support for hypothetical context. When moving under a binder one can
54 attach to the bound variable extra information that is collected when the
55 variable gets out of scope. For example when writing a type-checker the
56 programmer needs not to care about managing the typing context.
57
58- Native support for higher order unification variables, again via HOAS.
59 Unification variables of the meta-language (λProlog) can be reused to
60 represent the unification variables of the object language. The programmer
61 does not need to care about the unification-variable assignment map and
62 cannot assign to a unification variable a term containing variables out of
63 scope, or build a circular assignment.
64
65- Native support for syntactic constraints and their meta-level handling rules.
66 The generative semantics of Prolog can be disabled by turning a goal into a
67 syntactic constraint (suspended goal). A syntactic constraint is resumed as
68 soon as relevant variables gets assigned. Syntactic constraints can be
69 manipulated by constraint handling rules (CHR).
70
71- Native support for backtracking. To ease implementation of search.
72
73- The constraint store is extensible. The host application can declare
74 non-syntactic constraints and use custom constraint solvers to check their
75 consistency.
76
77- Clauses are graftable. The user is free to extend an existing program by
78 inserting/removing clauses, both at runtime (using implication) and at
79 "compilation" time by accumulating files.
80
81ELPI is free software released under the terms of LGPL 2.1 or above."""
82url {
83 src:
84 "https://github.com/LPCIC/elpi/releases/download/v2.0.4/elpi-2.0.4.tbz"
85 checksum: [
86 "sha256=670dd926a7d5c8b5eb0456801759feffc2d16b50a5a8a62c4e5898369544b2a8"
87 "sha512=b3d8836c4368c2bc64f2128ed89fa6ddf4d690dec5cf2e4c356bbe46689a81815ca2426e32dcf17ba7d7a4a91cfd18d6a3bd711a668eace671f50fdfd4e8615a"
88 ]
89}
90x-commit-hash: "bcaf0987daeea8ba565412f850aece650c929cc8"