fun parse_group(mgroup: MGroup): Array[MModule]
do
var res = new Array[MModule]
- visit_group(mgroup)
+ scan_group(mgroup)
for mg in mgroup.in_nesting.smallers do
for mp in mg.module_paths do
var nmodule = self.load_module(mp.filepath)
# special case for not a nit file
if path.file_extension != "nit" then
# search dirless files in known -I paths
- if path.dirname == "" then
+ if not path.chars.has('/') then
var res = search_module_in_paths(null, path, self.paths)
if res != null then return res
end
return mdoc
end
- # Force the identification of all ModulePath of the group and sub-groups.
- fun visit_group(mgroup: MGroup) do
+ # Force the identification of all ModulePath of the group and sub-groups in the file system.
+ #
+ # When a group is scanned, its sub-groups hierarchy is filled (see `MGroup::in_nesting`)
+ # and the potential modules (and nested modules) are identified (see `MGroup::module_paths`).
+ #
+ # Basically, this recursively call `get_mgroup` and `identify_file` on each directory entry.
+ fun scan_group(mgroup: MGroup) do
var p = mgroup.filepath
for f in p.files do
var fp = p/f
var g = get_mgroup(fp)
- if g != null then visit_group(g)
+ if g != null then scan_group(g)
identify_file(fp)
end
end
return mmodule
end
+ # Resolve the module identification for a given `AModuleName`.
+ #
+ # This method handles qualified names as used in `AModuleName`.
+ fun seach_module_by_amodule_name(n_name: AModuleName, mgroup: nullable MGroup): nullable ModulePath
+ do
+ if n_name.n_quad != null then mgroup = null # Start from top level
+ for grp in n_name.n_path do
+ var path = search_mmodule_by_name(grp, mgroup, grp.text)
+ if path == null then return null # Forward error
+ mgroup = path.mgroup
+ end
+ var mod_name = n_name.n_id.text
+ return search_mmodule_by_name(n_name, mgroup, mod_name)
+ end
+
# Analyze the module importation and fill the module_importation_hierarchy
#
# Unless you used `load_module`, the importation is already done and this method does a no-op.
var stdimport = true
var imported_modules = new Array[MModule]
for aimport in nmodule.n_imports do
+ # Do not imports conditional
+ var atconditionals = aimport.get_annotations("conditional")
+ if atconditionals.not_empty then continue
+
stdimport = false
if not aimport isa AStdImport then
continue
end
- var mgroup = mmodule.mgroup
- if aimport.n_name.n_quad != null then mgroup = null # Start from top level
- for grp in aimport.n_name.n_path do
- var path = search_mmodule_by_name(grp, mgroup, grp.text)
- if path == null then
- nmodule.mmodule = null # invalidate the module
- return # Skip error
- end
- mgroup = path.mgroup
+
+ # Load the imported module
+ var suppath = seach_module_by_amodule_name(aimport.n_name, mmodule.mgroup)
+ if suppath == null then
+ nmodule.mmodule = null # invalidate the module
+ continue # Skip error
end
- var mod_name = aimport.n_name.n_id.text
- var sup = self.get_mmodule_by_name(aimport.n_name, mgroup, mod_name)
+ var sup = load_module_path(suppath)
if sup == null then
nmodule.mmodule = null # invalidate the module
continue # Skip error
end
+
aimport.mmodule = sup
imported_modules.add(sup)
var mvisibility = aimport.n_visibility.mvisibility
mmodule.set_visibility_for(sup, public_visibility)
end
end
- self.toolcontext.info("{mmodule} imports {imported_modules.join(", ")}", 3)
+
+ # Declare conditional importation
+ for aimport in nmodule.n_imports do
+ if not aimport isa AStdImport then continue
+ var atconditionals = aimport.get_annotations("conditional")
+ if atconditionals.is_empty then continue
+
+ var suppath = seach_module_by_amodule_name(aimport.n_name, mmodule.mgroup)
+ if suppath == null then continue # skip error
+
+ for atconditional in atconditionals do
+ var nargs = atconditional.n_args
+ if nargs.is_empty then
+ error(atconditional, "Syntax Error: `conditional` expects module identifiers as arguments.")
+ continue
+ end
+
+ # The rule
+ var rule = new Array[Object]
+
+ # First element is the goal, thus
+ rule.add suppath
+
+ # Second element is the first condition, that is to be a client of the current module
+ rule.add mmodule
+
+ # Other condition are to be also a client of each modules indicated as arguments of the annotation
+ for narg in nargs do
+ var id = narg.as_id
+ if id == null then
+ error(narg, "Syntax Error: `conditional` expects module identifier as arguments.")
+ continue
+ end
+
+ var mp = search_mmodule_by_name(narg, mmodule.mgroup, id)
+ if mp == null then continue
+
+ rule.add mp
+ end
+
+ conditional_importations.add rule
+ end
+ end
+
mmodule.set_imported_mmodules(imported_modules)
+ apply_conditional_importations(mmodule)
+
+ self.toolcontext.info("{mmodule} imports {mmodule.in_importation.direct_greaters.join(", ")}", 3)
+
# Force standard to be public if imported
for sup in mmodule.in_importation.greaters do
if sup.name == "standard" then
end
end
+ # Global list of conditional importation rules.
+ #
+ # Each rule is a "Horn clause"-like sequence of modules.
+ # It means that the first module is the module to automatically import.
+ # The remaining modules are the conditions of the rule.
+ #
+ # Each module is either represented by a MModule (if the module is already loaded)
+ # or by a ModulePath (if the module is not yet loaded).
+ #
+ # Rules are declared by `build_module_importation` and are applied by `apply_conditional_importations`
+ # (and `build_module_importation` that calls it).
+ #
+ # TODO (when the loader will be rewritten): use a better representation and move up rules in the model.
+ private var conditional_importations = new Array[SequenceRead[Object]]
+
+ # Extends the current importations according to imported rules about conditional importation
+ fun apply_conditional_importations(mmodule: MModule)
+ do
+ # Because a conditional importation may cause additional conditional importation, use a fixed point
+ # The rules are checked naively because we assume that it does not worth to be optimized
+ var check_conditional_importations = true
+ while check_conditional_importations do
+ check_conditional_importations = false
+
+ for ci in conditional_importations do
+ # Check conditions
+ for i in [1..ci.length[ do
+ var rule_element = ci[i]
+ # An element of a rule is either a MModule or a ModulePath
+ # We need the mmodule to resonate on the importation
+ var m
+ if rule_element isa MModule then
+ m = rule_element
+ else if rule_element isa ModulePath then
+ m = rule_element.mmodule
+ # Is loaded?
+ if m == null then continue label
+ else
+ abort
+ end
+ # Is imported?
+ if not mmodule.in_importation.greaters.has(m) then continue label
+ end
+ # Still here? It means that all conditions modules are loaded and imported
+
+ # Identify the module to automatically import
+ var suppath = ci.first.as(ModulePath)
+ var sup = load_module_path(suppath)
+ if sup == null then continue
+
+ # Do nothing if already imported
+ if mmodule.in_importation.greaters.has(sup) then continue label
+
+ # Import it
+ self.toolcontext.info("{mmodule} conditionally imports {sup}", 3)
+ # TODO visibility rules (currently always public)
+ mmodule.set_visibility_for(sup, public_visibility)
+ # TODO linearization rules (currently added at the end in the order of the rules)
+ mmodule.set_imported_mmodules([sup])
+
+ # Prepare to reapply the rules
+ check_conditional_importations = true
+ end label
+ end
+ end
+
# All the loaded modules
var nmodules = new Array[AModule]
nitlanguage / nit.git / blobdiff