1 # This file is part of NIT ( http://www.nitlanguage.org ).
3 # Copyright 2012 Jean Privat <jean@pryen.org>
5 # Licensed under the Apache License, Version 2.0 (the "License");
6 # you may not use this file except in compliance with the License.
7 # You may obtain a copy of the License at
9 # http://www.apache.org/licenses/LICENSE-2.0
11 # Unless required by applicable law or agreed to in writing, software
12 # distributed under the License is distributed on an "AS IS" BASIS,
13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 # See the License for the specific language governing permissions and
15 # limitations under the License.
17 # Load nit source files and build the associated model
21 # FIXME split this module into submodules
22 # FIXME add missing error checks
32 private import more_collections
36 redef class ToolContext
38 var opt_path
: OptionArray = new OptionArray("Set include path for loaders (may be used more than once)", "-I", "--path")
40 # Option --only-metamodel
41 var opt_only_metamodel
: OptionBool = new OptionBool("Stop after meta-model processing", "--only-metamodel")
44 var opt_only_parse
: OptionBool = new OptionBool("Only proceed to parse step of loaders", "--only-parse")
46 # Option --ignore-visibility
47 var opt_ignore_visibility
: OptionBool = new OptionBool("Do not check, and produce errors, on visibility issues.", "--ignore-visibility")
52 option_context
.add_option
(opt_path
, opt_only_parse
, opt_only_metamodel
, opt_ignore_visibility
)
55 fun modelbuilder
: ModelBuilder do return modelbuilder_real
.as(not null)
56 private var modelbuilder_real
: nullable ModelBuilder = null
58 # Run `process_mainmodule` on all phases
59 fun run_global_phases
(mmodules
: Array[MModule])
61 assert not mmodules
.is_empty
63 if mmodules
.length
== 1 then
64 mainmodule
= mmodules
.first
66 # We need a main module, so we build it by importing all modules
67 mainmodule
= new MModule(modelbuilder
.model
, null, "<main>", new Location(null, 0, 0, 0, 0))
68 mainmodule
.set_imported_mmodules
(mmodules
)
70 for phase
in phases_list
do
71 if phase
.disabled
then continue
72 phase
.process_mainmodule
(mainmodule
, mmodules
)
78 # Specific action to execute on the whole program.
79 # Called by the `ToolContext::run_global_phases`.
81 # `mainmodule` is the main module of the program.
82 # It could be an implicit module (called "<main>").
84 # `given_modules` is the list of explicitely requested modules.
85 # from the command-line for instance.
87 # REQUIRE: `not given_modules.is_empty`
88 # REQUIRE: `(given_modules.length == 1) == (mainmodule == given_modules.first)`
91 fun process_mainmodule
(mainmodule
: MModule, given_mmodules
: SequenceRead[MModule]) do end
95 # A model builder knows how to load nit source files and build the associated model
97 # The model where new modules, classes and properties are added
100 # The toolcontext used to control the interaction with the user (getting options and displaying messages)
101 var toolcontext
: ToolContext
103 # Run phases on all loaded modules
106 var mmodules
= model
.mmodules
.to_a
107 model
.mmodule_importation_hierarchy
.sort
(mmodules
)
108 var nmodules
= new Array[AModule]
109 for mm
in mmodules
do
110 nmodules
.add
(mmodule2nmodule
[mm
])
112 toolcontext
.run_phases
(nmodules
)
114 if toolcontext
.opt_only_metamodel
.value
then
115 self.toolcontext
.info
("*** ONLY METAMODEL", 1)
120 # Instantiate a modelbuilder for a model and a toolcontext
121 # Important, the options of the toolcontext must be correctly set (parse_option already called)
122 init(model
: Model, toolcontext
: ToolContext)
125 self.toolcontext
= toolcontext
126 assert toolcontext
.modelbuilder_real
== null
127 toolcontext
.modelbuilder_real
= self
129 # Setup the paths value
130 paths
.append
(toolcontext
.opt_path
.value
)
132 var path_env
= "NIT_PATH".environ
133 if not path_env
.is_empty
then
134 paths
.append
(path_env
.split_with
(':'))
137 path_env
= "NIT_DIR".environ
138 if not path_env
.is_empty
then
139 var libname
= "{path_env}/lib"
140 if libname
.file_exists
then paths
.add
(libname
)
143 var libname
= "{sys.program_name.dirname}/../lib"
144 if libname
.file_exists
then paths
.add
(libname
.simplify_path
)
147 # Load a bunch of modules.
148 # `modules` can contains filenames or module names.
149 # Imported modules are automatically loaded and modelized.
150 # The result is the corresponding model elements.
151 # Errors and warnings are printed with the toolcontext.
153 # Note: class and property model element are not analysed.
154 fun parse
(modules
: Sequence[String]): Array[MModule]
157 # Parse and recursively load
158 self.toolcontext
.info
("*** PARSE ***", 1)
159 var mmodules
= new ArraySet[MModule]
161 var nmodule
= self.load_module
(a
)
162 if nmodule
== null then continue # Skip error
163 mmodules
.add
(nmodule
.mmodule
.as(not null))
166 self.toolcontext
.info
("*** END PARSE: {time1-time0} ***", 2)
168 self.toolcontext
.check_errors
170 if toolcontext
.opt_only_parse
.value
then
171 self.toolcontext
.info
("*** ONLY PARSE...", 1)
178 # Return a class named `name` visible by the module `mmodule`.
179 # Visibility in modules is correctly handled.
180 # If no such a class exists, then null is returned.
181 # If more than one class exists, then an error on `anode` is displayed and null is returned.
182 # FIXME: add a way to handle class name conflict
183 fun try_get_mclass_by_name
(anode
: ANode, mmodule
: MModule, name
: String): nullable MClass
185 var classes
= model
.get_mclasses_by_name
(name
)
186 if classes
== null then
190 var res
: nullable MClass = null
191 for mclass
in classes
do
192 if not mmodule
.in_importation
<= mclass
.intro_mmodule
then continue
193 if not mmodule
.is_visible
(mclass
.intro_mmodule
, mclass
.visibility
) then continue
197 error
(anode
, "Ambigous class name '{name}'; conflict between {mclass.full_name} and {res.full_name}")
204 # Return a property named `name` on the type `mtype` visible in the module `mmodule`.
205 # Visibility in modules is correctly handled.
206 # Protected properties are returned (it is up to the caller to check and reject protected properties).
207 # If no such a property exists, then null is returned.
208 # If more than one property exists, then an error on `anode` is displayed and null is returned.
209 # FIXME: add a way to handle property name conflict
210 fun try_get_mproperty_by_name2
(anode
: ANode, mmodule
: MModule, mtype
: MType, name
: String): nullable MProperty
212 var props
= self.model
.get_mproperties_by_name
(name
)
213 if props
== null then
217 var cache
= self.try_get_mproperty_by_name2_cache
[mmodule
, mtype
, name
]
218 if cache
!= null then return cache
220 var res
: nullable MProperty = null
221 var ress
: nullable Array[MProperty] = null
222 for mprop
in props
do
223 if not mtype
.has_mproperty
(mmodule
, mprop
) then continue
224 if not mmodule
.is_visible
(mprop
.intro_mclassdef
.mmodule
, mprop
.visibility
) then continue
230 # Two global properties?
231 # First, special case for init, keep the most specific ones
232 if res
isa MMethod and mprop
isa MMethod and res
.is_init
and mprop
.is_init
then
233 var restype
= res
.intro_mclassdef
.bound_mtype
234 var mproptype
= mprop
.intro_mclassdef
.bound_mtype
235 if mproptype
.is_subtype
(mmodule
, null, restype
) then
236 # found a most specific constructor, so keep it
242 # Ok, just keep all prop in the ress table
244 ress
= new Array[MProperty]
251 if ress
!= null and res
isa MMethod and res
.is_init
then
252 # special case forinit again
253 var restype
= res
.intro_mclassdef
.bound_mtype
254 var ress2
= new Array[MProperty]
256 var mproptype
= mprop
.intro_mclassdef
.bound_mtype
257 if not restype
.is_subtype
(mmodule
, null, mproptype
) then
259 else if not mprop
isa MMethod or not mprop
.is_init
then
263 if ress2
.is_empty
then
272 assert ress
.length
> 1
273 var s
= new Array[String]
274 for mprop
in ress
do s
.add mprop
.full_name
275 self.error
(anode
, "Ambigous property name '{name}' for {mtype}; conflict between {s.join(" and ")}")
278 self.try_get_mproperty_by_name2_cache
[mmodule
, mtype
, name
] = res
282 private var try_get_mproperty_by_name2_cache
: HashMap3[MModule, MType, String, nullable MProperty] = new HashMap3[MModule, MType, String, nullable MProperty]
285 # Alias for try_get_mproperty_by_name2(anode, mclassdef.mmodule, mclassdef.mtype, name)
286 fun try_get_mproperty_by_name
(anode
: ANode, mclassdef
: MClassDef, name
: String): nullable MProperty
288 return try_get_mproperty_by_name2
(anode
, mclassdef
.mmodule
, mclassdef
.bound_mtype
, name
)
291 # The list of directories to search for top level modules
292 # The list is initially set with :
293 # * the toolcontext --path option
294 # * the NIT_PATH environment variable
295 # * some heuristics including the NIT_DIR environment variable and the progname of the process
296 # Path can be added (or removed) by the client
297 var paths
: Array[String] = new Array[String]
299 # Like (an used by) `get_mmodule_by_name` but just return the ModulePath
300 private fun search_mmodule_by_name
(anode
: ANode, mgroup
: nullable MGroup, name
: String): nullable ModulePath
302 # First, look in groups
305 var dirname
= c
.filepath
306 if dirname
== null then break # virtual group
307 if dirname
.has_suffix
(".nit") then break # singleton project
309 # Second, try the directory to find a file
310 var try_file
= dirname
+ "/" + name
+ ".nit"
311 if try_file
.file_exists
then
312 var res
= self.identify_file
(try_file
.simplify_path
)
317 # Third, try if the requested module is itself a group
318 try_file
= dirname
+ "/" + name
+ "/" + name
+ ".nit"
319 if try_file
.file_exists
then
320 var res
= self.identify_file
(try_file
.simplify_path
)
328 # Look at some known directories
329 var lookpaths
= self.paths
331 # Look in the directory of the group project also (even if not explicitely in the path)
332 if mgroup
!= null then
333 # path of the root group
334 var dirname
= mgroup
.mproject
.root
.filepath
335 if dirname
!= null then
336 dirname
= dirname
.join_path
("..").simplify_path
337 if not lookpaths
.has
(dirname
) and dirname
.file_exists
then
338 lookpaths
= lookpaths
.to_a
339 lookpaths
.add
(dirname
)
344 var candidate
= search_module_in_paths
(anode
.hot_location
, name
, lookpaths
)
346 if candidate
== null then
347 if mgroup
!= null then
348 error
(anode
, "Error: cannot find module {name} from {mgroup.name}. tried {lookpaths.join(", ")}")
350 error
(anode
, "Error: cannot find module {name}. tried {lookpaths.join(", ")}")
357 # Get a module by its short name; if required, the module is loaded, parsed and its hierarchies computed.
358 # If `mgroup` is set, then the module search starts from it up to the top level (see `paths`);
359 # if `mgroup` is null then the module is searched in the top level only.
360 # If no module exists or there is a name conflict, then an error on `anode` is displayed and null is returned.
361 fun get_mmodule_by_name
(anode
: ANode, mgroup
: nullable MGroup, name
: String): nullable MModule
363 var path
= search_mmodule_by_name
(anode
, mgroup
, name
)
364 if path
== null then return null # Forward error
365 var res
= self.load_module
(path
.filepath
)
366 if res
== null then return null # Forward error
367 return res
.mmodule
.as(not null)
370 # Search a module `name` from path `lookpaths`.
371 # If found, the path of the file is returned
372 private fun search_module_in_paths
(location
: nullable Location, name
: String, lookpaths
: Collection[String]): nullable ModulePath
374 var candidate
: nullable String = null
375 for dirname
in lookpaths
do
376 var try_file
= (dirname
+ "/" + name
+ ".nit").simplify_path
377 if try_file
.file_exists
then
378 if candidate
== null then
380 else if candidate
!= try_file
then
381 # try to disambiguate conflicting modules
382 var abs_candidate
= module_absolute_path
(candidate
)
383 var abs_try_file
= module_absolute_path
(try_file
)
384 if abs_candidate
!= abs_try_file
then
385 toolcontext
.error
(location
, "Error: conflicting module file for {name}: {candidate} {try_file}")
389 try_file
= (dirname
+ "/" + name
+ "/" + name
+ ".nit").simplify_path
390 if try_file
.file_exists
then
391 if candidate
== null then
393 else if candidate
!= try_file
then
394 # try to disambiguate conflicting modules
395 var abs_candidate
= module_absolute_path
(candidate
)
396 var abs_try_file
= module_absolute_path
(try_file
)
397 if abs_candidate
!= abs_try_file
then
398 toolcontext
.error
(location
, "Error: conflicting module file for {name}: {candidate} {try_file}")
403 if candidate
== null then return null
404 return identify_file
(candidate
)
407 # cache for `identify_file` by realpath
408 private var identified_files
= new HashMap[String, nullable ModulePath]
410 # Identify a source file
411 # Load the associated project and groups if required
412 private fun identify_file
(path
: String): nullable ModulePath
414 # special case for not a nit file
415 if path
.file_extension
!= "nit" then
416 # search in known -I paths
417 var res
= search_module_in_paths
(null, path
, self.paths
)
418 if res
!= null then return res
420 # Found nothins? maybe it is a group...
422 if path
.file_exists
then
423 var mgroup
= get_mgroup
(path
)
424 if mgroup
!= null then
425 var owner_path
= mgroup
.filepath
.join_path
(mgroup
.name
+ ".nit")
426 if owner_path
.file_exists
then candidate
= owner_path
430 if candidate
== null then
431 toolcontext
.error
(null, "Error: cannot find module `{path}`.")
437 # Fast track, the path is already known
438 var pn
= path
.basename
(".nit")
439 var rp
= module_absolute_path
(path
)
440 if identified_files
.has_key
(rp
) then return identified_files
[rp
]
443 var mgrouppath
= path
.join_path
("..").simplify_path
444 var mgroup
= get_mgroup
(mgrouppath
)
446 if mgroup
== null then
448 var mproject
= new MProject(pn
, model
)
449 mgroup
= new MGroup(pn
, mproject
, null) # same name for the root group
450 mgroup
.filepath
= path
451 mproject
.root
= mgroup
452 toolcontext
.info
("found project `{pn}` at {path}", 2)
455 var res
= new ModulePath(pn
, path
, mgroup
)
456 mgroup
.module_paths
.add
(res
)
458 identified_files
[rp
] = res
463 private var mgroups
= new HashMap[String, nullable MGroup]
465 # return the mgroup associated to a directory path
466 # if the directory is not a group null is returned
467 private fun get_mgroup
(dirpath
: String): nullable MGroup
469 var rdp
= module_absolute_path
(dirpath
)
470 if mgroups
.has_key
(rdp
) then
474 # Hack, a dir is determined by the presence of a honomymous nit file
475 var pn
= rdp
.basename
(".nit")
476 var mp
= dirpath
.join_path
(pn
+ ".nit").simplify_path
478 if not mp
.file_exists
then return null
480 # check parent directory
481 var parentpath
= dirpath
.join_path
("..").simplify_path
482 var parent
= get_mgroup
(parentpath
)
485 if parent
== null then
486 # no parent, thus new project
487 var mproject
= new MProject(pn
, model
)
488 mgroup
= new MGroup(pn
, mproject
, null) # same name for the root group
489 mproject
.root
= mgroup
490 toolcontext
.info
("found project `{mproject}` at {dirpath}", 2)
492 mgroup
= new MGroup(pn
, parent
.mproject
, parent
)
493 toolcontext
.info
("found sub group `{mgroup.full_name}` at {dirpath}", 2)
495 mgroup
.filepath
= dirpath
496 mgroups
[rdp
] = mgroup
500 # Transform relative paths (starting with '../') into absolute paths
501 private fun module_absolute_path
(path
: String): String do
502 return getcwd
.join_path
(path
).simplify_path
505 # Try to load a module AST using a path.
506 # Display an error if there is a problem (IO / lexer / parser) and return null
507 fun load_module_ast
(filename
: String): nullable AModule
509 if filename
.file_extension
!= "nit" then
510 self.toolcontext
.error
(null, "Error: file {filename} is not a valid nit module.")
513 if not filename
.file_exists
then
514 self.toolcontext
.error
(null, "Error: file {filename} not found.")
518 self.toolcontext
.info
("load module {filename}", 2)
521 var file
= new IFStream.open
(filename
)
522 var lexer
= new Lexer(new SourceFile(filename
, file
))
523 var parser
= new Parser(lexer
)
524 var tree
= parser
.parse
526 var mod_name
= filename
.basename
(".nit")
528 # Handle lexer and parser error
529 var nmodule
= tree
.n_base
530 if nmodule
== null then
531 var neof
= tree
.n_eof
532 assert neof
isa AError
533 error
(neof
, neof
.message
)
540 # Try to load a module and its imported modules using a path.
541 # Display an error if there is a problem (IO / lexer / parser / importation) and return null
542 # Note: usually, you do not need this method, use `get_mmodule_by_name` instead.
543 fun load_module
(filename
: String): nullable AModule
545 # Look for the module
546 var file
= identify_file
(filename
)
547 if file
== null then return null # forward error
549 # Already known and loaded? then return it
550 var mmodule
= file
.mmodule
551 if mmodule
!= null then
552 return mmodule2nmodule
[mmodule
]
556 var nmodule
= load_module_ast
(file
.filepath
)
557 if nmodule
== null then return null # forward error
559 # build the mmodule and load imported modules
560 mmodule
= build_a_mmodule
(file
.mgroup
, file
.name
, nmodule
)
562 if mmodule
== null then return null # forward error
564 # Update the file information
565 file
.mmodule
= mmodule
567 # Load imported module
568 build_module_importation
(nmodule
)
573 fun load_rt_module
(parent
: MModule, nmodule
: AModule, mod_name
: String): nullable AModule
576 var mmodule
= new MModule(model
, parent
.mgroup
, mod_name
, nmodule
.location
)
577 nmodule
.mmodule
= mmodule
578 nmodules
.add
(nmodule
)
579 self.mmodule2nmodule
[mmodule
] = nmodule
581 var imported_modules
= new Array[MModule]
583 imported_modules
.add
(parent
)
584 mmodule
.set_visibility_for
(parent
, intrude_visibility
)
586 mmodule
.set_imported_mmodules
(imported_modules
)
591 # Visit the AST and create the `MModule` object
592 private fun build_a_mmodule
(mgroup
: nullable MGroup, mod_name
: String, nmodule
: AModule): nullable MModule
594 # Check the module name
595 var decl
= nmodule
.n_moduledecl
597 #warning(nmodule, "Warning: Missing 'module' keyword") #FIXME: NOT YET FOR COMPATIBILITY
599 var decl_name
= decl
.n_name
.n_id
.text
600 if decl_name
!= mod_name
then
601 error
(decl
.n_name
, "Error: module name missmatch; declared {decl_name} file named {mod_name}")
606 var mmodule
= new MModule(model
, mgroup
, mod_name
, nmodule
.location
)
607 nmodule
.mmodule
= mmodule
608 nmodules
.add
(nmodule
)
609 self.mmodule2nmodule
[mmodule
] = nmodule
612 var ndoc
= decl
.n_doc
613 if ndoc
!= null then mmodule
.mdoc
= ndoc
.to_mdoc
619 # Analysis the module importation and fill the module_importation_hierarchy
620 private fun build_module_importation
(nmodule
: AModule)
622 if nmodule
.is_importation_done
then return
623 nmodule
.is_importation_done
= true
624 var mmodule
= nmodule
.mmodule
.as(not null)
626 var imported_modules
= new Array[MModule]
627 for aimport
in nmodule
.n_imports
do
629 if not aimport
isa AStdImport then
632 var mgroup
= mmodule
.mgroup
633 if aimport
.n_name
.n_quad
!= null then mgroup
= null # Start from top level
634 for grp
in aimport
.n_name
.n_path
do
635 var path
= search_mmodule_by_name
(grp
, mgroup
, grp
.text
)
636 if path
== null then return # Skip error
639 var mod_name
= aimport
.n_name
.n_id
.text
640 var sup
= self.get_mmodule_by_name
(aimport
.n_name
, mgroup
, mod_name
)
641 if sup
== null then continue # Skip error
642 aimport
.mmodule
= sup
643 imported_modules
.add
(sup
)
644 var mvisibility
= aimport
.n_visibility
.mvisibility
645 if mvisibility
== protected_visibility
then
646 error
(aimport
.n_visibility
, "Error: only properties can be protected.")
649 if sup
== mmodule
then
650 error
(aimport
.n_name
, "Error: Dependency loop in module {mmodule}.")
652 if sup
.in_importation
< mmodule
then
653 error
(aimport
.n_name
, "Error: Dependency loop between modules {mmodule} and {sup}.")
656 mmodule
.set_visibility_for
(sup
, mvisibility
)
659 var mod_name
= "standard"
660 var sup
= self.get_mmodule_by_name
(nmodule
, null, mod_name
)
661 if sup
!= null then # Skip error
662 imported_modules
.add
(sup
)
663 mmodule
.set_visibility_for
(sup
, public_visibility
)
666 self.toolcontext
.info
("{mmodule} imports {imported_modules.join(", ")}", 3)
667 mmodule
.set_imported_mmodules
(imported_modules
)
670 # All the loaded modules
671 var nmodules
: Array[AModule] = new Array[AModule]
673 # Register the nmodule associated to each mmodule
674 # FIXME: why not refine the `MModule` class with a nullable attribute?
675 var mmodule2nmodule
: HashMap[MModule, AModule] = new HashMap[MModule, AModule]
677 # Helper function to display an error on a node.
678 # Alias for `self.toolcontext.error(n.hot_location, text)`
679 fun error
(n
: ANode, text
: String)
681 self.toolcontext
.error
(n
.hot_location
, text
)
684 # Helper function to display a warning on a node.
685 # Alias for: `self.toolcontext.warning(n.hot_location, text)`
686 fun warning
(n
: ANode, text
: String)
688 self.toolcontext
.warning
(n
.hot_location
, text
)
691 # Force to get the primitive method named `name` on the type `recv` or do a fatal error on `n`
692 fun force_get_primitive_method
(n
: ANode, name
: String, recv
: MClass, mmodule
: MModule): MMethod
694 var res
= mmodule
.try_get_primitive_method
(name
, recv
)
696 self.toolcontext
.fatal_error
(n
.hot_location
, "Fatal Error: {recv} must have a property named {name}.")
703 # placeholder to a module file identified but not always loaded in a project
704 private class ModulePath
705 # The name of the module
706 # (it's the basename of the filepath)
709 # The human path of the module
712 # The group (and the project) of the possible module
715 # The loaded module (if any)
716 var mmodule
: nullable MModule = null
718 redef fun to_s
do return filepath
722 # modules paths associated with the group
723 private var module_paths
= new Array[ModulePath]
726 redef class AStdImport
727 # The imported module once determined
728 var mmodule
: nullable MModule = null
732 # The associated MModule once build by a `ModelBuilder`
733 var mmodule
: nullable MModule
734 # Flag that indicate if the importation is already completed
735 var is_importation_done
: Bool = false
738 redef class AVisibility
739 # The visibility level associated with the AST node class
740 fun mvisibility
: MVisibility is abstract
742 redef class AIntrudeVisibility
743 redef fun mvisibility
do return intrude_visibility
745 redef class APublicVisibility
746 redef fun mvisibility
do return public_visibility
748 redef class AProtectedVisibility
749 redef fun mvisibility
do return protected_visibility
751 redef class APrivateVisibility
752 redef fun mvisibility
do return private_visibility
756 private var mdoc_cache
: nullable MDoc
760 if res
!= null then return res
762 for c
in n_comment
do
764 if text
.length
< 2 then
768 assert text
.chars
[0] == '#'
769 if text
.chars
[1] == ' ' then
770 text
= text
.substring_from
(2) # eat starting `#` and space
772 text
= text
.substring_from
(1) # eat atarting `#` only
774 if text
.chars
.last
== '\n' then text
= text
.substring
(0, text
.length-1
) # drop \n
775 res
.content
.add
(text
)