package coq

  1. Overview
  2. Docs
package coq
Legend:
Library
Module
Module type
Parameter
Class
Class type

The parser of Coq

include Gramlib.Grammar.S with type te = Tok.t and type 'a pattern = 'a Tok.p
type te = Tok.t
type 'a pattern = 'a Tok.p
type ty_pattern =
  1. | TPattern : 'a pattern -> ty_pattern
module Parsable : sig ... end
module Entry : sig ... end
module Symbol : sig ... end
module Rule : sig ... end
module Rules : sig ... end
module Production : sig ... end
type 'a single_extend_statement = string option * Gramlib.Gramext.g_assoc option * 'a Production.t list
type 'a extend_statement =
  1. | Reuse of string option * 'a Production.t list
    (*

    Extend an existing level by its optional given name. If None, picks the topmost level.

    *)
  2. | Fresh of Gramlib.Gramext.position * 'a single_extend_statement list
    (*

    Create a level at the given position.

    *)
val generalize_symbol : ('a, 'tr, 'c) Symbol.t -> ('a, Gramlib.Grammar.norec, 'c) Symbol.t option
val level_of_nonterm : ('a, Gramlib.Grammar.norec, 'c) Symbol.t -> string option
module Lookahead : sig ... end

The parser of Coq is built from three kinds of rule declarations:

  • dynamic rules declared at the evaluation of Coq files (using e.g. Notation, Infix, or Tactic Notation)
  • static rules explicitly defined in files g_*.mlg
  • static rules macro-generated by ARGUMENT EXTEND, TACTIC EXTEND and VERNAC EXTEND (see e.g. file extratactics.mlg)

Note that parsing a Coq document is in essence stateful: the parser needs to recognize commands that start proofs and use a different parsing entry point for them.

We thus provide two different interfaces: the "raw" parsing interface, in the style of camlp5, which provides more flexibility, and a more specialize "parse_vernac" one, which will indeed adjust the state as needed.

Dynamic extension of rules

For constr notations, dynamic addition of new rules is done in several steps:

  • "x + y" (user gives a notation string of type Topconstr.notation) | (together with a constr entry level, e.g. 50, and indications of) | (subentries, e.g. x in constr next level and y constr same level) | | splitting into tokens by Metasyntax.split_notation_string V String "x"; String "+"; String "y" : symbol_token list | | interpreted as a mixed parsing/printing production | by Metasyntax.analyse_notation_tokens V NonTerminal "x"; Terminal "+"; NonTerminal "y" : symbol list | | translated to a parsing production by Metasyntax.make_production V GramConstrNonTerminal (ETConstr (NextLevel,(BorderProd Left,LeftA)), Some "x"); GramConstrTerminal ("","+"); GramConstrNonTerminal (ETConstr (NextLevel,(BorderProd Right,LeftA)), Some "y") : grammar_constr_prod_item list | | Egrammar.make_constr_prod_item V Gramext.g_symbol list which is sent to camlp5

For user level tactic notations, dynamic addition of new rules is also done in several steps:

  • "f" constr(x) (user gives a Tactic Notation command) | | parsing V TacTerm "f"; TacNonTerm ("constr", Some "x") : grammar_tactic_prod_item_expr list | | Metasyntax.interp_prod_item V GramTerminal "f"; GramNonTerminal (ConstrArgType, Aentry ("constr","constr"), Some "x") : grammar_prod_item list | | Egrammar.make_prod_item V Gramext.g_symbol list

For TACTIC/VERNAC/ARGUMENT EXTEND, addition of new rules is done as follows:

  • "f" constr(x) (developer gives an EXTEND rule) | | macro-generation in tacextend.mlg/vernacextend.mlg/argextend.mlg V GramTerminal "f"; GramNonTerminal (ConstrArgType, Aentry ("constr","constr"), Some "x") | | Egrammar.make_prod_item V Gramext.g_symbol list

Parse a string

val parse_string : 'a Entry.t -> ?loc:Loc.t -> string -> 'a
val eoi_entry : 'a Entry.t -> 'a Entry.t
val create_generic_entry2 : string -> ('a, Genarg.rlevel) Genarg.abstract_argument_type -> 'a Entry.t
val register_grammar : ('raw, 'glb, 'top) Genarg.genarg_type -> 'raw Entry.t -> unit
val genarg_grammar : ('raw, 'glb, 'top) Genarg.genarg_type -> 'raw Entry.t
module Prim : sig ... end
module Constr : sig ... end
module Module : sig ... end
Type-safe grammar extension
val epsilon_value : ('a -> 'self) -> ('self, _, 'a) Symbol.t -> 'self option
Extending the parser without synchronization
val grammar_extend : 'a Entry.t -> 'a extend_statement -> unit

Extend the grammar of Coq, without synchronizing it with the backtracking mechanism. This means that grammar extensions defined this way will survive an undo.

Extending the parser with summary-synchronized commands

Auxiliary state of the grammar. Any added data must be marshallable.

Extension with parsing rules
type 'a grammar_command

Type of synchronized parsing extensions. The 'a type should be marshallable.

Type of reinitialization data

type extend_rule =
  1. | ExtendRule : 'a Entry.t * 'a extend_statement -> extend_rule
  2. | ExtendRuleReinit : 'a Entry.t * gram_reinit * 'a extend_statement -> extend_rule
type 'a grammar_extension = 'a -> GramState.t -> extend_rule list * GramState.t

Grammar extension entry point. Given some 'a and a current grammar state, such a function must produce the list of grammar extensions that will be applied in the same order and kept synchronized w.r.t. the summary, together with a new state. It should be pure.

val create_grammar_command : string -> 'a grammar_extension -> 'a grammar_command

Create a new grammar-modifying command with the given name. The extension function is called to generate the rules for a given data.

val extend_grammar_command : 'a grammar_command -> 'a -> unit

Extend the grammar of Coq with the given data.

Extension with parsing entries
type ('a, 'b) entry_command

Type of synchronized entry creation. The 'a type should be marshallable.

type ('a, 'b) entry_extension = 'a -> GramState.t -> string list * GramState.t

Entry extension entry point. Given some 'a and a current grammar state, such a function must produce the list of entry extensions that will be created and kept synchronized w.r.t. the summary, together with a new state. It should be pure.

val create_entry_command : string -> ('a, 'b) entry_extension -> ('a, 'b) entry_command

Create a new entry-creating command with the given name. The extension function is called to generate the new entries for a given data.

val extend_entry_command : ('a, 'b) entry_command -> 'a -> 'b Entry.t list

Create new synchronized entries using the provided data.

val find_custom_entry : ('a, 'b) entry_command -> string -> 'b Entry.t

Find an entry generated by the synchronized system in the current state.

  • raises Not_found

    if non-existent.

Protection w.r.t. backtrack
val with_grammar_rule_protection : ('a -> 'b) -> 'a -> 'b
type frozen_t
val parser_summary_tag : frozen_t Summary.Dyn.tag

Registering grammars by name

type any_entry =
  1. | AnyEntry : 'a Entry.t -> any_entry
val register_grammars_by_name : string -> any_entry list -> unit
val find_grammars_by_name : string -> any_entry list
val freeze : marshallable:bool -> frozen_t

Parsing state handling

val unfreeze : frozen_t -> unit
OCaml

Innovation. Community. Security.

GitHub Discord Twitter Peertube RSS
About
Changelog Releases Industrial Users Academic Users Why OCaml
Ecosystem
Packages Community Events OCaml Planet Jobs
Resources
Install OCaml Get Started Platform Tools Language Manual Standard Library API Books Exercises Papers OCaml Playground Logo
Policies
Carbon Footprint Governance Privacy Code of Conduct