# This file is part of NIT (http://www.nitlanguage.org).
#
# Copyright 2014 Frédéric Vachon <fredvac@gmail.com>
+# Copyright 2015 Alexis Laferrière <alexis.laf@xymus.net>
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
class CodeGenerator
- var with_attributes: Bool
- var comment_unknown_types: Bool
- var file_out: FileWriter
- var java_class: JavaClass
- var nb_params: Int
- var module_name: nullable String = null
+ # Path to the output file
+ var file_name: String
- init (file_name: String, jclass: JavaClass, with_attributes, comment: Bool)
- do
- file_out = new FileWriter.open(file_name)
+ # Model of Java class being wrapped
+ var model: JavaModel
- var nit_ext = ".nit"
- if file_name.has_suffix(nit_ext) then
- # Output file ends with .nit, we expect it to be a valid name
- module_name = file_name.strip_extension(nit_ext)
+ # Comment out methods with unknown (unwrapped) types
+ var comment_unknown_types: Bool
- # Otherwise, it may be anything so do not declare a module
- end
+ # Generate stub classes for unknown types used in the generated module
+ var stub_for_unknown_types: Bool
+
+ # Output file
+ var file_out: Writer = new FileWriter.open(file_name) is lazy, writable
- self.java_class = jclass
- self.with_attributes = with_attributes
- self.comment_unknown_types = comment
+ # Name of the Nit module to generate
+ var module_name: nullable String is lazy do
+ if file_name.file_extension == "nit" then
+ # Output file ends with .nit, we expect it to be a valid name
+ return file_name.basename(".nit")
+ else return null
end
+ # Generate the Nit module into `file_out`
fun generate
do
- var jclass = self.java_class
+ # License
+ file_out.write license
- var class_content = new Array[String]
- class_content.add(gen_class_header(jclass.class_type))
+ # Module declaration
+ var module_name = module_name
+ if module_name != null then file_out.write "module {module_name}\n"
+ file_out.write "\n"
- if with_attributes then
- for id, jtype in jclass.attributes do class_content.add(gen_attribute(id, jtype))
+ # All importations
+ var imports = new HashSet[String]
+ imports.add "import java\n"
+ for key, jclass in model.classes do
+ for import_ in jclass.imports do imports.add "import android::{import_}\n"
end
+ file_out.write imports.join("\n")
+ file_out.write "\n"
+
+ for key, jclass in model.classes do
+
+ generate_class_header(jclass.class_type)
- for id, methods_info in jclass.methods do
- for method_info in methods_info do
- var nid = id
- if methods_info.length > 1 then nid += "{methods_info.index_of(method_info)}"
- class_content.add gen_method(id, nid, method_info.return_type, method_info.params)
+ for id, signatures in jclass.methods do
+ for signature in signatures do
+ generate_method(jclass, id, id, signature.return_type, signature.params)
+ file_out.write "\n"
+ end
end
- end
- class_content.add("\nend\n")
- var wrappers = new Array[String]
- for jtype in jclass.unknown_types do
- if jtype == jclass.class_type then continue
- wrappers.add("\n")
- wrappers.add(gen_unknown_class_header(jtype))
- end
+ # Constructors
+ for constructor in jclass.constructors do
+ var complex = jclass.constructors.length != 1 and constructor.params.not_empty
+ var base_name = if complex then "from" else ""
+ var name = jclass.nit_name_for(base_name, constructor.params, complex)
- var imports = new Array[String]
- imports.add("import mnit_android\n")
- for import_ in jclass.imports do
- imports.add("import android::{import_}\n")
- end
+ generate_constructor(jclass, constructor, name)
+ end
- file_out.write(gen_licence)
+ # Attributes
+ for id, java_type in jclass.attributes do
+ generate_getter_setter(jclass, id, java_type)
+ end
- var module_name = module_name
- if module_name != null then file_out.write "module {module_name}\n"
+ file_out.write "end\n\n"
+ end
- file_out.write("\n")
- file_out.write(imports.join(""))
- file_out.write("\n")
- file_out.write(class_content.join(""))
- file_out.write(wrappers.join(""))
+ if stub_for_unknown_types then
+ for jtype, nit_type in model.unknown_types do
+ generate_unknown_class_header(jtype)
+ file_out.write "\n"
+ end
+ end
end
- fun gen_licence: String
- do
- return """
+ # License for the header of the generated Nit module
+ var license = """
# This file is part of NIT (http://www.nitlanguage.org).
#
# Licensed under the Apache License, Version 2.0 (the "License");
# limitations under the License.
# This code has been generated using `jwrapper`
-"""
- end
+""" is writable
- fun gen_class_header(jtype: JavaType): String
+ private fun generate_class_header(jtype: JavaType)
do
- var temp = new Array[String]
- temp.add("extern class Native{jtype.id} in \"Java\" `\{ {jtype} `\}\n")
- temp.add("\tsuper JavaObject\n\n")
-
- return temp.join("")
+ var nit_type = model.java_to_nit_type(jtype)
+ file_out.write "# Java class: {jtype.to_package_name}\n"
+ file_out.write "extern class {nit_type} in \"Java\" `\{ {jtype.to_package_name} `\}\n"
+ file_out.write "\tsuper JavaObject\n\n"
end
- fun gen_unknown_class_header(jtype: JavaType): String
+ private fun generate_unknown_class_header(jtype: JavaType)
do
- var nit_type: NitType
- if jtype.extern_name.has_generic_params then
- nit_type = jtype.extern_name.generic_params.first
- else
- nit_type = jtype.extern_name
- end
-
- var temp = new Array[String]
- temp.add("extern class {nit_type} in \"Java\" `\{ {jtype.to_package_name} `\}\n")
- temp.add("\tsuper JavaObject\n\nend\n")
-
- return temp.join("")
- end
+ var nit_type = jtype.extern_name
- fun gen_attribute(jid: String, jtype: JavaType): String
- do
- return "\tvar {jid.to_nit_method_name}: {jtype.to_nit_type}\n"
+ file_out.write "extern class {nit_type} in \"Java\" `\{ {jtype.to_package_name} `\}\n"
+ file_out.write "\tsuper JavaObject\n\nend\n"
end
- fun gen_method(jmethod_id: String, nmethod_id: String, jreturn_type: JavaType, jparam_list: Array[JavaType]): String
+ private fun generate_method(java_class: JavaClass, jmethod_id, method_id: String,
+ jreturn_type: JavaType, jparam_list: Array[JavaType])
do
var java_params = ""
var nit_params = ""
# Parameters
for i in [0..jparam_list.length[ do
var jparam = jparam_list[i]
- var nit_type = jparam.to_nit_type
-
- if not nit_type.is_complete then
- if jparam.is_wrapped then
- java_class.imports.add nit_type.mod.as(not null)
- else
- if comment_unknown_types then
- comment = "#"
- else
- nit_type = jparam.extern_name
- java_class.unknown_types.add(jparam)
- end
- end
- end
+ var nit_type = model.java_to_nit_type(jparam)
- var cast = ""
+ if not nit_type.is_known then comment = "#"
+ if jparam.is_primitive_array then comment = "#"
- if not jparam.is_collection then cast = jparam.param_cast
+ var cast = jparam.param_cast
nit_types.add(nit_type)
- nit_type.arg_id = "{nit_id}{nit_id_no}"
if i == jparam_list.length - 1 then
java_params += "{cast}{nit_id}{nit_id_no}"
nit_id_no += 1
end
+ # Method documentation
+ var doc = "\t# Java implementation: {java_class}.{jmethod_id}\n"
+
# Method identifier
- var method_id = nmethod_id.to_nit_method_name
+ method_id = method_id.to_nit_method_name
+ method_id = java_class.nit_name_for(method_id, jparam_list, java_class.methods[jmethod_id].length > 1)
var nit_signature = new Array[String]
nit_signature.add "\tfun {method_id}"
end
var return_type = null
-
if not jreturn_type.is_void then
- return_type = jreturn_type.to_nit_type
-
- if not return_type.is_complete then
- if jreturn_type.is_wrapped then
- java_class.imports.add return_type.mod.as(not null)
- else
- if comment_unknown_types then
- comment = "#"
- else
- return_type = jreturn_type.extern_name
- java_class.unknown_types.add(jreturn_type)
- end
- end
- end
+ return_type = model.java_to_nit_type(jreturn_type)
+
+ if not return_type.is_known then comment = "#"
+ if jreturn_type.is_primitive_array then comment = "#"
nit_signature.add ": {return_type} "
end
- var temp = new Array[String]
+ file_out.write doc
+ file_out.write comment + nit_signature.join
- temp.add(comment + nit_signature.join(""))
-
- # FIXME : This huge `if` block is only necessary to copy primitive arrays as long as there's no better way to do it
if comment == "#" then
- temp.add(" in \"Java\" `\{\n{comment}\t\trecv.{jmethod_id}({java_params});\n{comment}\t`\}\n")
+ file_out.write " in \"Java\" `\{\n{comment}\t\tself.{jmethod_id}({java_params});\n{comment}\t`\}\n"
# Methods with return type
else if return_type != null then
- temp.add(" in \"Java\" `\{\n{comment}\t\treturn {jreturn_type.return_cast}recv.{jmethod_id}({java_params});\n{comment}\t`\}\n")
+ file_out.write " in \"Java\" `\{\n{comment}\t\treturn {jreturn_type.return_cast}self.{jmethod_id}({java_params});\n{comment}\t`\}\n"
# Methods without return type
else if jreturn_type.is_void then
- temp.add(" in \"Java\" `\{\n{comment}\t\trecv.{jmethod_id}({java_params});\n{comment}\t`\}\n")
+ file_out.write " in \"Java\" `\{\n{comment}\t\tself.{jmethod_id}({java_params});\n{comment}\t`\}\n"
# No copy
else
- temp.add(" in \"Java\" `\{\n{comment}\t\trecv.{jmethod_id}({java_params});\n{comment}\t`\}\n")
+ file_out.write " in \"Java\" `\{\n{comment}\t\tself.{jmethod_id}({java_params});\n{comment}\t`\}\n"
end
+ end
- return temp.join("")
+ # Generate getter and setter to access an attribute, of field
+ private fun generate_getter_setter(java_class: JavaClass, java_id: String, java_type: JavaType)
+ do
+ var nit_type = model.java_to_nit_type(java_type)
+ var nit_id = java_id.to_nit_method_name
+ nit_id = java_class.nit_name_for(nit_id, [java_type], false)
+
+ var c = ""
+ if not nit_type.is_known then c = "#"
+ if java_type.is_primitive_array then c = "#"
+
+ file_out.write """
+ # Java getter: {{{java_class}}}.{{{java_id}}}
+{{{c}}} fun {{{nit_id}}}: {{{nit_type}}} in "Java" `{
+{{{c}}} return self.{{{java_id}}};
+{{{c}}} `}
+
+ # Java setter: {{{java_class}}}.{{{java_id}}}
+{{{c}}} fun {{{nit_id}}}=(value: {{{nit_type}}}) in "Java" `{
+{{{c}}} self.{{{java_id}}} = value;
+{{{c}}} `}
+
+"""
+ end
+
+ # Generate getter and setter to access an attribute, of field
+ private fun generate_constructor(java_class: JavaClass, constructor: JavaConstructor, name: String)
+ do
+ var c = ""
+ var nit_params_s = ""
+ var java_params_s = ""
+
+ if constructor.params.not_empty then
+ var nit_params = new Array[String]
+ var java_params = new Array[String]
+ var param_id = 'a'
+ for java_type in constructor.params do
+
+ java_params.add "{java_type.param_cast}{param_id}"
+
+ var nit_type = model.java_to_nit_type(java_type)
+ nit_params.add "{param_id}: {nit_type}"
+ param_id = param_id.successor(1)
+
+ if not nit_type.is_known then c = "#"
+ if java_type.is_primitive_array then c = "#"
+ end
+
+ nit_params_s = "(" + nit_params.join(", ") + ")"
+ java_params_s = java_params.join(", ")
+ end
+
+ file_out.write """
+ # Java constructor: {{{java_class}}}
+{{{c}}} new {{{name}}}{{{nit_params_s}}} in "Java" `{
+{{{c}}} return new {{{java_class}}}({{{java_params_s}}});
+{{{c}}} `}
+
+"""
end
end
+redef class Sys
+ # List of Nit keywords
+ #
+ # These may also be keywords in Java, but there they would be used capitalized.
+ private var nit_keywords = new HashSet[String].from(["abort", "abstract", "and", "assert",
+ "break", "class", "continue", "do", "else", "end", "enum", "extern", "false", "implies",
+ "import", "init", "interface", "intrude", "if", "in", "is", "isa", "isset", "for", "label",
+ "loop", "module", "new", "not", "null", "nullable", "or", "package", "private",
+ "protected", "public", "return", "self", "super", "then", "true", "type", "var", "while",
+
+ # Top-level methods
+ "class_name", "get_time", "hash", "is_same_type", "is_same_instance", "output",
+
+ # Pointer or JavaObject methods
+ "free"])
+end
+
redef class String
+
# Convert the Java method name `self` to the Nit style
#
# * Converts to snake case
if name.has_prefix("get_") then
name = name.substring_from(4)
else if name.has_prefix("set_") then
- name = name.substring_from(4) + "="
+ name = name.substring_from(4)
+ if nit_keywords.has(name) then name += "_"
+ name += "="
+ end
+
+ # Strip the '_' prefix
+ while name.has_prefix("_") do name = name.substring(1, name.length-1)
+
+ # Escape Nit keywords
+ if nit_keywords.has(name) then name += "_"
+
+ # If the name starts by something other than a letter, prefix with `java_`
+ if not name.chars.first.is_letter then name = "java_" + name
+
+ name = name.replace("$", "_")
+
+ return name
+ end
+end
+
+redef class JavaClass
+ # Property names used in this class
+ private var used_name = new HashSet[String]
+
+ # Get an available property name for the Java property with `name` and parameters
+ #
+ # If `use_parameters_name` then expect that there will be conflicts,
+ # so use the types of `parameters` to build the name.
+ private fun nit_name_for(name: String, parameters: Array[JavaType], use_parameters_name: Bool): String
+ do
+ # Append the name of each parameter
+ if use_parameters_name then
+ for param in parameters do
+ name += "_" + param.id
+ end
+ end
+
+ # As a last resort, append numbers to the name
+ var base_name = name
+ var count = 1
+ while used_name.has(name) do
+ name = base_name + count.to_s
+ count += 1
end
+ used_name.add name
return name
end
end
nitlanguage / nit.git / blobdiff