module Fl_metascanner:Parses META filessig..end
typeformal_pred =[ `NegPred of string | `Pred of string ]
typeflavour =[ `Appendix | `BaseDef ]
`BaseDef refers to META definitions using the "=" operator,
and `Appendix refers to definitions using the "+=" operator.type
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def_var : |
(* | The name of the defined variable | *) |
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def_flav : |
(* | The flavour of the definition | *) |
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def_preds : |
(* | The formal predicates of the def | *) |
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def_value : |
(* | The value assigned to the variable | *) |
pkg_definition is expressed by the syntax
var(p1,p2,...) = "value" var(p1,p2,...) += "value" type
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pkg_defs : |
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pkg_children : |
pkg_expr denotes the contents of a META file.
The component pkg_defs are the variable definitions.
The component pkg_children contains
the definitions of the subpackages.val parse : Pervasives.in_channel -> pkg_exprparse ch:
scans and parses the file connected with channel ch. The file must
have a syntax compatible with the META format. The return value
contains the found definitions for the package and all subpackages.
exception Stream.Error of string: is
raised on syntax errors. The string explains the error.
val print : Pervasives.out_channel -> pkg_expr -> unitprint ch expr:
Outputs the package expression to a channel.val lookup : string -> string list -> pkg_definition list -> stringlookup variable_name predicate_list def:
Returns the value of variable_name in def under the assumption
that the predicates in predicate_list hold, but no other predicates.
The rules are as follows: In the step (A), only the `BaseDef
definitions are considered. The first base definition is determined where
all predicates are satisfied and that has the longest predicate list.
In the step (B) only the `Appendix definitions are considered.
All definitions are determined where all predicates are satisfied.
The final result is the concatenation of the single result of (A)
and all results of (B) (in the order they are defined). A space
character is inserted between two concatenated strings.
When step (A) does not find any matching definition, the exception
Not_found is raised.
val predicate_exists : string -> pkg_definition list -> boolpredicate_exists variable_name def:
Whether variable_name is explicitly mentioned in def.
