mirror of https://github.com/japl-lang/japl.git
94 lines
2.9 KiB
Nim
94 lines
2.9 KiB
Nim
# Copyright 2020 Mattia Giambirtone
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import baseObject
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import ../meta/opcode
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import japlString
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import arrayList
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type
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FunctionType* {.pure.} = enum
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## All code in JAPL is compiled
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## as if it was inside some sort
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## of function. To differentiate
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## between actual functions and
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## the top-level code, this tiny
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## enum is used to tell the two
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## contexts apart when compiling
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Func, Script, Lambda
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Function* = object of Obj
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## A function object
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name*: ptr String
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arity*: int # The number of required parameters
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optionals*: int # The number of optional parameters
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defaults*: ptr ArrayList[ptr String]
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chunk*: Chunk # The function's body
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proc newFunction*(name: string = "", chunk: Chunk, arity: int = 0): ptr Function =
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## Allocates a new function object with the given
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## bytecode chunk and arity. If the name is an empty string
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## (the default), the function will be an
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## anonymous code object
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# TODO: Add support for optional parameters
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result = allocateObj(Function, ObjectType.Function)
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if name.len >= 1:
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result.name = name.asStr()
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else:
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result.name = nil
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result.arity = arity
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result.chunk = chunk
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result.optionals = 0 # TODO
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result.defaults = newArrayList[ptr String]()
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proc newLambda*(chunk: Chunk, arity: int = 0): ptr Function =
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## Allocates a new lambda object (anonymous function) with the given
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## bytecode chunk and arity
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# TODO: Add support for optional parameters
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result = allocateObj(Function, ObjectType.Function)
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result.name = "<lambda function>".asStr()
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result.arity = arity
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result.chunk = chunk
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result.optionals = 0
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proc typeName*(self: ptr Function): string =
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result = "function"
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proc stringify*(self: ptr Function): string =
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if self.name != nil:
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if self.name.toStr() == "<lambda function>":
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result = self.name.toStr()
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else:
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result = "<function '" & self.name.toStr() & "'>"
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else:
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result = "<code object>"
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proc isFalsey*(self: ptr Function): bool =
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result = false
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proc hash*(self: ptr Function): uint64 =
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# TODO: Hashable?
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raise newException(NotImplementedError, "unhashable type 'function'")
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proc eq*(self, other: ptr Function): bool =
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result = self == other # Pointer equality
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