559 lines
15 KiB
Clojure
559 lines
15 KiB
Clojure
(ns ^{:doc "Application Description Language support library - utility functions."
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:author "Simon Brooke"}
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adl-support.utils
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(:require [clojure.math.numeric-tower :refer [expt]]
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[clojure.pprint :as p]
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[clojure.string :as s]))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;;
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;;;; adl-support.utils: utility functions.
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;;;;
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;;;; This program is free software; you can redistribute it and/or
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;;;; modify it under the terms of the MIT-style licence provided; see LICENSE.
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;;;;
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;;;; This program is distributed in the hope that it will be useful,
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;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;;; License for more details.
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;;;;
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;;;; Copyright (C) 2018 Simon Brooke
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;;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; TODO: this really ought to be split into several namespaces
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(def ^:dynamic *locale*
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"The locale for which files will be generated."
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"en_GB.UTF-8")
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(def ^:dynamic *output-path*
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"The path to which generated files will be written."
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"generated/")
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(def ^:dynamic *verbosity*
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"The verbosity of output from the generator."
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0)
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(defn element?
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"True if `o` is a Clojure representation of an XML element."
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[o]
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(and (map? o) (:tag o) (:attrs o)))
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(defn wrap-lines
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"Wrap lines in this `text` to this `width`; return a list of lines."
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;; Shamelessly adapted from https://www.rosettacode.org/wiki/Word_wrap#Clojure
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([width text]
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(s/split-lines
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(p/cl-format
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nil
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(str "~{~<~%~1," width ":;~A~> ~}")
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(clojure.string/split text #" "))))
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([text]
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(wrap-lines 76 text)))
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(defn emit-header
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"Emit this `content` as a sequence of wrapped lines each prefixed with
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`prefix`, and the whole delimited by rules."
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[prefix & content]
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(let [comment-rule (apply str (repeat 70 (last prefix)))
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p (str "\n" prefix "\t") ]
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(str
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prefix
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comment-rule
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p
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(s/join
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p
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(flatten
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(interpose
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""
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(map
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#(wrap-lines 70 (str %))
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(flatten content)))))
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"\n"
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prefix
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comment-rule)))
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(defn sort-by-name
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[elements]
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(sort #(compare (:name (:attrs %1)) (:name (:attrs %2))) elements))
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(defn link-table-name
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"Canonical name of a link table between entity `e1` and entity `e2`. However, there
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may be different links between the same two tables with different semantics; if
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`property` is specified, and if more than one property in `e1` links to `e2`, generate
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a more specific link name."
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([e1 e2]
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(s/join
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"_"
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(cons
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"ln"
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(sort
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(list
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(:name (:attrs e1)) (:name (:attrs e2)))))))
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([property e1 e2]
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(if (count
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(descendants
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e1
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#(and
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(= (-> % :attrs :type) "link")
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(=
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(-> % :attrs :entity)
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(-> property :attrs :entity)))))
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(s/join
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"_" (cons "ln" (map #(:name (:attrs %)) (list property e1 e2))))
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(link-table-name e1 e2))))
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(defn children
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"Return the children of this `element`; if `predicate` is passed, return only those
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children satisfying the predicate."
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([element]
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(if
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(keyword? (:tag element)) ;; it has a tag; it seems to be an XML element
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(:content element)))
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([element predicate]
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(filter
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predicate
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(children element))))
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(defn child
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"Return the first child of this `element` satisfying this `predicate`."
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[element predicate]
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(first (children element predicate)))
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(defn attributes
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"Return the attributes of this `element`; if `predicate` is passed, return only those
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attributes satisfying the predicate."
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([element]
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(if
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(keyword? (:tag element)) ;; it has a tag; it seems to be an XML element
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(:attrs element)))
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([element predicate]
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(filter
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predicate
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(attributes element))))
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(defn children-with-tag
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"Return all children of this `element` which have this `tag`;
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if `element` is `nil`, return `nil`. If `predicate` is supplied,
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return only those children with the specified `tag` which satisfy
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the `predicate`."
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([element tag]
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(if
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element
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(children element #(= (:tag %) tag))))
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([element tag predicate]
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(filter
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predicate
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(children-with-tag element tag))))
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(defn child-with-tag
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"Return the first child of this `element` which has this `tag`;
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if `element` is `nil`, return `nil`. If `predicate` is supplied,
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return only the first child with the specified `tag` which satisfies
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the `predicate`."
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([element tag]
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(first (children-with-tag element tag)))
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([element tag predicate]
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(first (children-with-tag element tag predicate))))
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(defn typedef
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"If this `property` is of type `defined`, return its type definition from
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this `application`, else nil."
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[property application]
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(if
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(= (:type (:attrs property)) "defined")
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(child
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application
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#(and
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(= (:tag %) :typedef)
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(= (:name (:attrs %)) (:typedef (:attrs property)))))))
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(defn permission-groups
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"Return a list of names of groups to which this `predicate` is true of
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some permission taken from these `permissions`, else nil."
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[permissions predicate]
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(let [groups (remove
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nil?
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(map
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#(if
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(apply predicate (list %))
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(:group (:attrs %)))
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permissions))]
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(if groups groups)))
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(defn formal-primary-key?
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"Does this `prop-or-name` appear to be a property (or the name of a property)
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which is a formal primary key of this entity?"
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[prop-or-name entity]
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(if
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(map? prop-or-name)
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(formal-primary-key? (:name (:attrs prop-or-name)) entity)
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(let [primary-key (first (children entity #(= (:tag %) :key)))
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property (first
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(children
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primary-key
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#(and
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(= (:tag %) :property)
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(= (:name (:attrs %)) prop-or-name))))]
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(= (:distinct (:attrs property)) "system"))))
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(defn entity?
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"Return true if `x` is an ADL entity."
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[x]
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(= (:tag x) :entity))
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(defn property?
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"True if `o` is a property."
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[o]
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(= (:tag o) :property))
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(defn entity-for-property
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"If this `property` references an entity, return that entity from this `application`"
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[property application]
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(if
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(and (property? property) (:entity (:attrs property)))
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(child
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application
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#(and
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(entity? %)
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(= (:name (:attrs %))(:entity (:attrs property)))))))
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(defn visible-to
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"Return a list of names of groups to which are granted read access,
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given these `permissions`, else nil."
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[permissions]
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(permission-groups permissions #(#{"read" "insert" "noedit" "edit" "all"} (:permission (:attrs %)))))
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(defn writeable-by
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"Return a list of names of groups to which are granted write access,
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given these `permissions`, else nil.
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TODO: TOTHINKABOUT: properties are also writeable by `insert` and `noedit`, but only if the
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current value is nil."
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([permissions]
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(writeable-by permissions true))
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([permissions has-value?]
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(let
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[privileges (if has-value? #{"edit" "all"} #{"edit" "all" "insert" "noedit"})]
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(permission-groups permissions #(privileges (:permission (:attrs %)))))))
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(defn singularise
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"Attempt to construct an idiomatic English-language singular of this string."
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[string]
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(cond
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(.endsWith string "ss") string
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(.endsWith string "ise") string
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true
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(s/replace
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(s/replace
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(s/replace
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(s/replace string #"_" "-")
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#"s$" "")
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#"se$" "s")
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#"ie$" "y")))
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(defn capitalise
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"Return a string like `s` but with each token capitalised."
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[s]
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(if
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(string? s)
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(s/join
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" "
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(map
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#(apply str (cons (Character/toUpperCase (first %)) (rest %)))
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(s/split s #"[ \t\r\n]+")))
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s))
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(defn pretty-name
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[entity]
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(capitalise (singularise (:name (:attrs entity)))))
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(defn safe-name
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"Return a safe name for the object `o`, given the specified `convention`.
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`o` is expected to be either a string or an element."
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([o]
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(if
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(element? o)
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(safe-name (:name (:attrs o)))
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(s/replace (str o) #"[^a-zA-Z0-9-]" "")))
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([o convention]
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(if
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(element? o)
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(safe-name (:name (:attrs o)) convention)
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(let [string (str o)]
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(case convention
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(:sql :c) (s/replace string #"[^a-zA-Z0-9_]" "_")
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:c-sharp (s/replace (capitalise string) #"[^a-zA-Z0-9]" "")
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:java (let
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[camel (s/replace (capitalise string) #"[^a-zA-Z0-9]" "")]
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(apply str (cons (Character/toLowerCase (first camel)) (rest camel))))
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(safe-name string))))))
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(defn property-for-field
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"Return the property within this `entity` which matches this `field`."
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[field entity]
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(child-with-tag
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entity
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:property
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#(=
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(-> field :attrs :property)
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(-> % :attrs :name))))
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(defn prompt
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"Return an appropriate prompt for the given `field-or-property` taken from this
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`form` of this `entity` of this `application`, in the context of the current
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binding of `*locale*`. TODO: something more sophisticated about i18n"
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[field-or-property form entity application]
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(let [property (case (:tag field-or-property)
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:property field-or-property
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:field (property-for-field field-or-property entity)
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nil)]
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(capitalise
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(or
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(:prompt
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(:attrs
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(child-with-tag
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field-or-property
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:prompt
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#(= (:locale (:attrs %)) *locale*))))
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(:prompt
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(:attrs
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(child-with-tag
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property
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:prompt
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#(= (:locale (:attrs %)) *locale*))))
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(:name (:attrs property))
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(:property (:attrs field-or-property))
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"Missing prompt"))))
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(defmacro properties
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"Return all the properties of this `entity`."
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[entity]
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`(children-with-tag ~entity :property))
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(defn descendants-with-tag
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"Return all descendants of this `element`, recursively, which have this `tag`.
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If `predicate` is specified, return only those also satisfying this `predicate`."
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([element tag]
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(flatten
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(remove
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empty?
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(cons
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(children element #(= (:tag %) tag))
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(map
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#(descendants-with-tag % tag)
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(children element))))))
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([element tag predicate]
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(filter
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predicate
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(descendants-with-tag element tag))))
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(defn descendant-with-tag
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"Return the first descendant of this `element`, recursively, which has this `tag`.
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If `predicate` is specified, return the first also satisfying this `predicate`."
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([element tag]
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(first (descendants-with-tag element tag)))
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([element tag predicate]
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(first (descendants-with-tag element tag predicate))))
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(defn find-permissions
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"Return appropriate the permissions of the first of these `elements` which
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has permissions."
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[& elements]
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(first
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(remove
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empty?
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(map
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#(children-with-tag % :permission)
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elements))))
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(defn insertable?
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"Return `true` it the value of this `property` may be set from user-supplied data."
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[property]
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(and
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(= (:tag property) :property)
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(not (#{"link"} (:type (:attrs property))))
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(not (= (:distinct (:attrs property)) "system"))))
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(defmacro all-properties
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"Return all properties of this `entity` (including key properties)."
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[entity]
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`(descendants-with-tag ~entity :property))
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(defn user-distinct-properties
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"Return the properties of this `entity` which are user distinct"
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[entity]
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(filter #(#{"user" "all"} (:distinct (:attrs %))) (all-properties entity)))
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(defn user-distinct-property-names
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"Return, as a set, the names of properties which are user distinct"
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[entity]
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(set
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(map
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(fn [x] (-> x :attrs :name))
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(user-distinct-properties entity))))
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(defmacro insertable-properties
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"Return all the properties of this `entity` (including key properties) into
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which user-supplied data can be inserted"
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[entity]
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`(filter
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insertable?
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(all-properties ~entity)))
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(defmacro key-properties
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[entity]
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`(children-with-tag (first (children-with-tag ~entity :key)) :property))
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(defmacro insertable-key-properties
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[entity]
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`(filter insertable? (key-properties entity)))
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(defn link-table?
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"Return true if this `entity` represents a link table."
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[entity]
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(let [properties (all-properties entity)
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links (filter #(-> % :attrs :entity) properties)]
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(= (count properties) (count links))))
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(defn key-names
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([entity]
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(set
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(remove
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nil?
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(map
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#(:name (:attrs %))
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(key-properties entity)))))
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([entity as-keywords?]
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(let [names (key-names entity)]
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(if
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as-keywords?
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(set (map keyword names))
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names))))
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(defn base-type
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[property application]
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(cond
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(:typedef (:attrs property))
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(:type
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(:attrs
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(child
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application
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#(and
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(= (:tag %) :typedef)
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(= (:name (:attrs %)) (:typedef (:attrs property)))))))
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(:entity (:attrs property))
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(:type
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(:attrs
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(first
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(key-properties
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(child
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application
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#(and
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(= (:tag %) :entity)
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(= (:name (:attrs %)) (:entity (:attrs property)))))))))
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true
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(:type (:attrs property))))
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(defn is-quotable-type?
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"True if the value for this field should be quoted."
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[property application]
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(#{"date" "image" "string" "text" "time" "timestamp" "uploadable"} (base-type property application)))
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(defn has-primary-key? [entity]
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(> (count (key-names entity)) 0))
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(defn has-non-key-properties? [entity]
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(>
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(count (all-properties entity))
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(count (key-properties entity))))
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(defn distinct-properties
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[entity]
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(filter
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#(#{"system" "all"} (:distinct (:attrs %)))
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(properties entity)))
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(defn path-part
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"Return the URL path part for this `form` of this `entity` within this `application`.
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Note that `form` may be a Clojure XML representation of a `form`, `list` or `page`
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ADL element, or may be one of the keywords `:form`, `:list`, `:page` in which case the
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first child of the `entity` of the specified type will be used."
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[form entity application]
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(cond
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(and (map? form) (#{:list :form :page} (:tag form)))
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(s/join
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"-"
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(flatten
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(list
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(name (:tag form)) (:name (:attrs entity)) (s/split (:name (:attrs form)) #"[ \n\r\t]+"))))
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(keyword? form)
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(path-part (first (children-with-tag entity form)) entity application)))
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(defn editor-name
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"Return the path-part of the editor form for this `entity`. Note:
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assumes the editor form is the first form listed for the entity."
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[entity application]
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(path-part :form entity application))
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(defn type-for-defined
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[property application]
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(:type (:attrs (typedef property application))))
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(defn volatility
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"Return the cache ttl in seconds for records of this `entity`."
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[entity]
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(try
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(let
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[v (read-string (:volatility (:attrs entity)))]
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(if
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(zero? v)
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0
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(expt 10 v)))
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(catch Exception _ 0)))
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