Re-tabbed to 2 spaces to follow convention.
This commit is contained in:
Joey Payne
parent
52730a6564
commit
957d8dbd66
1 changed files with 288 additions and 288 deletions
574
oop_macro.nim
574
oop_macro.nim
|
|
@ -4,327 +4,327 @@ import strutils
|
||||||
{.hint[XDeclaredButNotUsed]: off.}
|
{.hint[XDeclaredButNotUsed]: off.}
|
||||||
|
|
||||||
macro new*(obj: untyped): untyped {.immediate.}=
|
macro new*(obj: untyped): untyped {.immediate.}=
|
||||||
if obj.kind == nnkObjConstr or obj.kind == nnkCall:
|
if obj.kind == nnkObjConstr or obj.kind == nnkCall:
|
||||||
var args: seq[NimNode] = @[]
|
var args: seq[NimNode] = @[]
|
||||||
var new_obj = copyNimTree(obj)
|
var new_obj = copyNimTree(obj)
|
||||||
|
|
||||||
# delete the parameters from the object
|
# delete the parameters from the object
|
||||||
# since we are going to use init() instead
|
# since we are going to use init() instead
|
||||||
new_obj.del(1, len(new_obj)-1)
|
new_obj.del(1, len(new_obj)-1)
|
||||||
|
|
||||||
# create a symbol that we can use
|
# create a symbol that we can use
|
||||||
var sym = genSym(nskVar, "init_obj")
|
var sym = genSym(nskVar, "init_obj")
|
||||||
|
|
||||||
# self = init_obj
|
# self = init_obj
|
||||||
var self_eq = newNimNode(nnkExprEqExpr).add(ident"self", sym)
|
var self_eq = newNimNode(nnkExprEqExpr).add(ident"self", sym)
|
||||||
|
|
||||||
args.add(self_eq)
|
args.add(self_eq)
|
||||||
|
|
||||||
for ch in obj.children:
|
for ch in obj.children:
|
||||||
if ch.kind == nnkExprColonExpr:
|
if ch.kind == nnkExprColonExpr:
|
||||||
# some_arg = some_val
|
# some_arg = some_val
|
||||||
args.add(newNimNode(nnkExprEqExpr).add(ch[0], ch[1]))
|
args.add(newNimNode(nnkExprEqExpr).add(ch[0], ch[1]))
|
||||||
|
|
||||||
# init(self=init_obj, some_arg=someval, ...)
|
# init(self=init_obj, some_arg=someval, ...)
|
||||||
var init_call = newCall(ident"init", args)
|
var init_call = newCall(ident"init", args)
|
||||||
|
|
||||||
template new_object(symbol, obj_node, init_func)=
|
template new_object(symbol, obj_node, init_func)=
|
||||||
var symbol = obj_node
|
var symbol = obj_node
|
||||||
when compiles(init_func):
|
when compiles(init_func):
|
||||||
init_func
|
init_func
|
||||||
symbol
|
symbol
|
||||||
|
|
||||||
result = getAst(new_object(sym, new_obj, init_call))
|
result = getAst(new_object(sym, new_obj, init_call))
|
||||||
else:
|
else:
|
||||||
# otherwise, just call system.new on the object
|
# otherwise, just call system.new on the object
|
||||||
# since we don't care about it
|
# since we don't care about it
|
||||||
template new_object(obj)=
|
template new_object(obj)=
|
||||||
var init_obj = obj
|
var init_obj = obj
|
||||||
system.new(init_obj)
|
system.new(init_obj)
|
||||||
result = getAst(new_object(obj))
|
result = getAst(new_object(obj))
|
||||||
|
|
||||||
|
|
||||||
macro class*(head: untyped, body: untyped): untyped =
|
macro class*(head: untyped, body: untyped): untyped =
|
||||||
|
|
||||||
# object reference name inside methods.
|
# object reference name inside methods.
|
||||||
# ie: self, self
|
# ie: self, self
|
||||||
let obj_reference = "self"
|
let obj_reference = "self"
|
||||||
var export_class: bool = false
|
var export_class: bool = false
|
||||||
|
|
||||||
var typeName, baseName: NimNode
|
var typeName, baseName: NimNode
|
||||||
|
|
||||||
if head.kind == nnkIdent:
|
if head.kind == nnkIdent:
|
||||||
# `head` is expression `typeName`
|
# `head` is expression `typeName`
|
||||||
# echo head.treeRepr
|
# echo head.treeRepr
|
||||||
# --------------------
|
|
||||||
# Ident !"Animal"
|
|
||||||
typeName = head
|
|
||||||
|
|
||||||
elif head.kind == nnkInfix and $head[0] == "of":
|
|
||||||
# `head` is expression `typeName of baseClass`
|
|
||||||
# echo head.treeRepr
|
|
||||||
# --------------------
|
|
||||||
# Infix
|
|
||||||
# Ident !"of"
|
|
||||||
# Ident !"Animal"
|
|
||||||
# Ident !"RootObj"
|
|
||||||
typeName = head[1]
|
|
||||||
baseName = head[2]
|
|
||||||
|
|
||||||
elif head.kind == nnkInfix and $head[0] == "*" and $head[1] == "of":
|
|
||||||
# echo head.treeRepr
|
|
||||||
# -----------
|
|
||||||
# Infix
|
|
||||||
# Ident !"*"
|
|
||||||
# Ident !"Animal
|
|
||||||
# Prefix
|
|
||||||
# Ident !"of"
|
|
||||||
# Ident !"RootObj"
|
|
||||||
export_class = true
|
|
||||||
typeName = head[1]
|
|
||||||
baseName = head[2][1]
|
|
||||||
elif head.kind == nnkInfix and $head[0] == "*":
|
|
||||||
export_class = true
|
|
||||||
typeName = head[1]
|
|
||||||
else:
|
|
||||||
quit "Invalid node: " & head.lispRepr
|
|
||||||
|
|
||||||
# echo treeRepr(body)
|
|
||||||
# --------------------
|
# --------------------
|
||||||
# StmtList
|
# Ident !"Animal"
|
||||||
# VarSection
|
typeName = head
|
||||||
# IdentDefs
|
|
||||||
# Ident !"name"
|
|
||||||
# Ident !"string"
|
|
||||||
# Empty
|
|
||||||
# IdentDefs
|
|
||||||
# Ident !"age"
|
|
||||||
# Ident !"int"
|
|
||||||
# Empty
|
|
||||||
# MethodDef
|
|
||||||
# Ident !"vocalize"
|
|
||||||
# Empty
|
|
||||||
# Empty
|
|
||||||
# FormalParams
|
|
||||||
# Ident !"string"
|
|
||||||
# Empty
|
|
||||||
# Empty
|
|
||||||
# StmtList
|
|
||||||
# StrLit ...
|
|
||||||
# MethodDef
|
|
||||||
# Ident !"age_human_yrs"
|
|
||||||
# Empty
|
|
||||||
# Empty
|
|
||||||
# FormalParams
|
|
||||||
# Ident !"int"
|
|
||||||
# Empty
|
|
||||||
# Empty
|
|
||||||
# StmtList
|
|
||||||
# DotExpr
|
|
||||||
# Ident !"self"
|
|
||||||
# Ident !"age"
|
|
||||||
|
|
||||||
# create a new stmtList for the result
|
elif head.kind == nnkInfix and $head[0] == "of":
|
||||||
result = newStmtList()
|
# `head` is expression `typeName of baseClass`
|
||||||
|
# echo head.treeRepr
|
||||||
# var declarations will be turned into object fields
|
|
||||||
var recList = newNimNode(nnkRecList)
|
|
||||||
|
|
||||||
# add a super function to simulate OOP
|
|
||||||
# inheritance tree (Doesn't do what is expected because of dynamic binding)
|
|
||||||
#if not isNil(`baseName`):
|
|
||||||
# var super = quote do:
|
|
||||||
# proc super(self: `typeName`): `baseName`=
|
|
||||||
# return `baseName`(self)
|
|
||||||
# result.add(super)
|
|
||||||
|
|
||||||
template set_node_name(n2, proc_name, type_name)=
|
|
||||||
if n2.name.kind == nnkIdent:
|
|
||||||
proc_name = $(n2.name.toStrLit())
|
|
||||||
n2.name = ident(proc_name & type_name)
|
|
||||||
elif n2.name.kind == nnkPostFix:
|
|
||||||
if n2.name[1].kind == nnkIdent:
|
|
||||||
proc_name = $(n2.name[1].toStrLit())
|
|
||||||
n2.name[1] = ident(proc_name & type_name)
|
|
||||||
elif n2.name[1].kind == nnkAccQuoted:
|
|
||||||
proc_name = $(n2.name[1][0].toStrLit())
|
|
||||||
n2.name[1][0] = ident(proc_name & type_name)
|
|
||||||
elif n2.name.kind == nnkAccQuoted:
|
|
||||||
proc_name = $(n2.name[0].toStrLit())
|
|
||||||
n2.name[0] = ident(proc_name & type_name)
|
|
||||||
result.add(n2)
|
|
||||||
|
|
||||||
# Make forward declarations so that function order
|
|
||||||
# does not matter, just like in real OOP!
|
|
||||||
for node in body.children:
|
|
||||||
case node.kind:
|
|
||||||
of nnkMethodDef, nnkProcDef:
|
|
||||||
# inject `self: T` into the arguments
|
|
||||||
let n = copyNimTree(node)
|
|
||||||
n.params.insert(1, newIdentDefs(ident(obj_reference), typeName))
|
|
||||||
# clear the body so we only get a
|
|
||||||
# declaration
|
|
||||||
n.body = newEmptyNode()
|
|
||||||
result.add(n)
|
|
||||||
|
|
||||||
# forward declare the inheritable method
|
|
||||||
let n2 = copyNimTree(n)
|
|
||||||
let type_name = $(typeName.toStrLit())
|
|
||||||
var proc_name = ""
|
|
||||||
|
|
||||||
set_node_name(n2, proc_name, type_name)
|
|
||||||
else:
|
|
||||||
discard
|
|
||||||
|
|
||||||
# Iterate over the statements, adding `self: T`
|
|
||||||
# to the parameters of functions
|
|
||||||
for node in body.children:
|
|
||||||
case node.kind:
|
|
||||||
of nnkMethodDef, nnkProcDef:
|
|
||||||
# inject `self: T` into the arguments
|
|
||||||
let n = copyNimTree(node)
|
|
||||||
n.params.insert(1, newIdentDefs(ident(obj_reference), typeName))
|
|
||||||
|
|
||||||
# Copy the proc or method for inheritance
|
|
||||||
# ie: procName_ClassName()
|
|
||||||
let n2 = copyNimTree(node)
|
|
||||||
n2.params.insert(1, newIdentDefs(ident(obj_reference), typeName))
|
|
||||||
|
|
||||||
let type_name = $(typeName.toStrLit())
|
|
||||||
var proc_name = $(n2.name.toStrLit())
|
|
||||||
var is_assignment = proc_name.contains("=")
|
|
||||||
|
|
||||||
set_node_name(n2, proc_name, type_name)
|
|
||||||
|
|
||||||
# simply call the class method from here
|
|
||||||
# proc procName=
|
|
||||||
# procName_ClassName()
|
|
||||||
var p: seq[NimNode] = @[]
|
|
||||||
for i in 1..n.params.len-1:
|
|
||||||
p.add(n.params[i][0])
|
|
||||||
if is_assignment:
|
|
||||||
let dot = newDotExpr(ident(obj_reference), ident(proc_name & type_name))
|
|
||||||
n.body = newStmtList(newAssignment(dot, p[1]))
|
|
||||||
else:
|
|
||||||
n.body = newStmtList(newCall(proc_name & type_name, p))
|
|
||||||
|
|
||||||
result.add(n)
|
|
||||||
|
|
||||||
of nnkVarSection:
|
|
||||||
# variables get turned into fields of the type.
|
|
||||||
for n in node.children:
|
|
||||||
recList.add(n)
|
|
||||||
else:
|
|
||||||
result.add(node)
|
|
||||||
|
|
||||||
# The following prints out the AST structure:
|
|
||||||
#
|
|
||||||
# import macros
|
|
||||||
# dumptree:
|
|
||||||
# type X = ref object of Y
|
|
||||||
# z: int
|
|
||||||
# --------------------
|
# --------------------
|
||||||
# TypeSection
|
# Infix
|
||||||
# TypeDef
|
# Ident !"of"
|
||||||
# Ident !"X"
|
# Ident !"Animal"
|
||||||
# Empty
|
# Ident !"RootObj"
|
||||||
# RefTy
|
typeName = head[1]
|
||||||
# ObjectTy
|
baseName = head[2]
|
||||||
# Empty
|
|
||||||
# OfInherit
|
|
||||||
# Ident !"Y"
|
|
||||||
# RecList
|
|
||||||
# IdentDefs
|
|
||||||
# Ident !"z"
|
|
||||||
# Ident !"int"
|
|
||||||
# Empty
|
|
||||||
|
|
||||||
var type_decl: NimNode
|
elif head.kind == nnkInfix and $head[0] == "*" and $head[1] == "of":
|
||||||
|
# echo head.treeRepr
|
||||||
|
# -----------
|
||||||
|
# Infix
|
||||||
|
# Ident !"*"
|
||||||
|
# Ident !"Animal
|
||||||
|
# Prefix
|
||||||
|
# Ident !"of"
|
||||||
|
# Ident !"RootObj"
|
||||||
|
export_class = true
|
||||||
|
typeName = head[1]
|
||||||
|
baseName = head[2][1]
|
||||||
|
elif head.kind == nnkInfix and $head[0] == "*":
|
||||||
|
export_class = true
|
||||||
|
typeName = head[1]
|
||||||
|
else:
|
||||||
|
quit "Invalid node: " & head.lispRepr
|
||||||
|
|
||||||
template declare_type_export(tname, bname)=
|
# echo treeRepr(body)
|
||||||
type tname* = ref object of bname
|
# --------------------
|
||||||
template declare_type(tname, bname)=
|
# StmtList
|
||||||
type tname = ref object of bname
|
# VarSection
|
||||||
|
# IdentDefs
|
||||||
|
# Ident !"name"
|
||||||
|
# Ident !"string"
|
||||||
|
# Empty
|
||||||
|
# IdentDefs
|
||||||
|
# Ident !"age"
|
||||||
|
# Ident !"int"
|
||||||
|
# Empty
|
||||||
|
# MethodDef
|
||||||
|
# Ident !"vocalize"
|
||||||
|
# Empty
|
||||||
|
# Empty
|
||||||
|
# FormalParams
|
||||||
|
# Ident !"string"
|
||||||
|
# Empty
|
||||||
|
# Empty
|
||||||
|
# StmtList
|
||||||
|
# StrLit ...
|
||||||
|
# MethodDef
|
||||||
|
# Ident !"age_human_yrs"
|
||||||
|
# Empty
|
||||||
|
# Empty
|
||||||
|
# FormalParams
|
||||||
|
# Ident !"int"
|
||||||
|
# Empty
|
||||||
|
# Empty
|
||||||
|
# StmtList
|
||||||
|
# DotExpr
|
||||||
|
# Ident !"self"
|
||||||
|
# Ident !"age"
|
||||||
|
|
||||||
if baseName == nil:
|
# create a new stmtList for the result
|
||||||
if export_class:
|
result = newStmtList()
|
||||||
type_decl = getAst(declare_type_export(typeName, RootObj))
|
|
||||||
|
# var declarations will be turned into object fields
|
||||||
|
var recList = newNimNode(nnkRecList)
|
||||||
|
|
||||||
|
# add a super function to simulate OOP
|
||||||
|
# inheritance tree (Doesn't do what is expected because of dynamic binding)
|
||||||
|
#if not isNil(`baseName`):
|
||||||
|
# var super = quote do:
|
||||||
|
# proc super(self: `typeName`): `baseName`=
|
||||||
|
# return `baseName`(self)
|
||||||
|
# result.add(super)
|
||||||
|
|
||||||
|
template set_node_name(n2, proc_name, type_name)=
|
||||||
|
if n2.name.kind == nnkIdent:
|
||||||
|
proc_name = $(n2.name.toStrLit())
|
||||||
|
n2.name = ident(proc_name & type_name)
|
||||||
|
elif n2.name.kind == nnkPostFix:
|
||||||
|
if n2.name[1].kind == nnkIdent:
|
||||||
|
proc_name = $(n2.name[1].toStrLit())
|
||||||
|
n2.name[1] = ident(proc_name & type_name)
|
||||||
|
elif n2.name[1].kind == nnkAccQuoted:
|
||||||
|
proc_name = $(n2.name[1][0].toStrLit())
|
||||||
|
n2.name[1][0] = ident(proc_name & type_name)
|
||||||
|
elif n2.name.kind == nnkAccQuoted:
|
||||||
|
proc_name = $(n2.name[0].toStrLit())
|
||||||
|
n2.name[0] = ident(proc_name & type_name)
|
||||||
|
result.add(n2)
|
||||||
|
|
||||||
|
# Make forward declarations so that function order
|
||||||
|
# does not matter, just like in real OOP!
|
||||||
|
for node in body.children:
|
||||||
|
case node.kind:
|
||||||
|
of nnkMethodDef, nnkProcDef:
|
||||||
|
# inject `self: T` into the arguments
|
||||||
|
let n = copyNimTree(node)
|
||||||
|
n.params.insert(1, newIdentDefs(ident(obj_reference), typeName))
|
||||||
|
# clear the body so we only get a
|
||||||
|
# declaration
|
||||||
|
n.body = newEmptyNode()
|
||||||
|
result.add(n)
|
||||||
|
|
||||||
|
# forward declare the inheritable method
|
||||||
|
let n2 = copyNimTree(n)
|
||||||
|
let type_name = $(typeName.toStrLit())
|
||||||
|
var proc_name = ""
|
||||||
|
|
||||||
|
set_node_name(n2, proc_name, type_name)
|
||||||
|
else:
|
||||||
|
discard
|
||||||
|
|
||||||
|
# Iterate over the statements, adding `self: T`
|
||||||
|
# to the parameters of functions
|
||||||
|
for node in body.children:
|
||||||
|
case node.kind:
|
||||||
|
of nnkMethodDef, nnkProcDef:
|
||||||
|
# inject `self: T` into the arguments
|
||||||
|
let n = copyNimTree(node)
|
||||||
|
n.params.insert(1, newIdentDefs(ident(obj_reference), typeName))
|
||||||
|
|
||||||
|
# Copy the proc or method for inheritance
|
||||||
|
# ie: procName_ClassName()
|
||||||
|
let n2 = copyNimTree(node)
|
||||||
|
n2.params.insert(1, newIdentDefs(ident(obj_reference), typeName))
|
||||||
|
|
||||||
|
let type_name = $(typeName.toStrLit())
|
||||||
|
var proc_name = $(n2.name.toStrLit())
|
||||||
|
var is_assignment = proc_name.contains("=")
|
||||||
|
|
||||||
|
set_node_name(n2, proc_name, type_name)
|
||||||
|
|
||||||
|
# simply call the class method from here
|
||||||
|
# proc procName=
|
||||||
|
# procName_ClassName()
|
||||||
|
var p: seq[NimNode] = @[]
|
||||||
|
for i in 1..n.params.len-1:
|
||||||
|
p.add(n.params[i][0])
|
||||||
|
if is_assignment:
|
||||||
|
let dot = newDotExpr(ident(obj_reference), ident(proc_name & type_name))
|
||||||
|
n.body = newStmtList(newAssignment(dot, p[1]))
|
||||||
else:
|
else:
|
||||||
type_decl = getAst(declare_type(typeName, RootObj))
|
n.body = newStmtList(newCall(proc_name & type_name, p))
|
||||||
else:
|
|
||||||
if export_class:
|
|
||||||
type_decl = getAst(declare_type_export(typeName, baseName))
|
|
||||||
else:
|
|
||||||
type_decl = getAst(declare_type(typeName, baseName))
|
|
||||||
|
|
||||||
# Inspect the tree structure:
|
result.add(n)
|
||||||
#
|
|
||||||
# echo type_decl.treeRepr
|
of nnkVarSection:
|
||||||
# --------------------
|
# variables get turned into fields of the type.
|
||||||
# StmtList
|
for n in node.children:
|
||||||
# TypeSection
|
recList.add(n)
|
||||||
# TypeDef
|
else:
|
||||||
# Ident !"Animal"
|
result.add(node)
|
||||||
# Empty
|
|
||||||
# RefTy
|
# The following prints out the AST structure:
|
||||||
# ObjectTy
|
#
|
||||||
# Empty
|
# import macros
|
||||||
# OfInherit
|
# dumptree:
|
||||||
# Ident !"RootObj"
|
# type X = ref object of Y
|
||||||
# Empty <= We want to replace self
|
# z: int
|
||||||
type_decl[0][0][2][0][2] = recList
|
# --------------------
|
||||||
result.insert(0, type_decl)
|
# TypeSection
|
||||||
|
# TypeDef
|
||||||
|
# Ident !"X"
|
||||||
|
# Empty
|
||||||
|
# RefTy
|
||||||
|
# ObjectTy
|
||||||
|
# Empty
|
||||||
|
# OfInherit
|
||||||
|
# Ident !"Y"
|
||||||
|
# RecList
|
||||||
|
# IdentDefs
|
||||||
|
# Ident !"z"
|
||||||
|
# Ident !"int"
|
||||||
|
# Empty
|
||||||
|
|
||||||
|
var type_decl: NimNode
|
||||||
|
|
||||||
|
template declare_type_export(tname, bname)=
|
||||||
|
type tname* = ref object of bname
|
||||||
|
template declare_type(tname, bname)=
|
||||||
|
type tname = ref object of bname
|
||||||
|
|
||||||
|
if baseName == nil:
|
||||||
|
if export_class:
|
||||||
|
type_decl = getAst(declare_type_export(typeName, RootObj))
|
||||||
|
else:
|
||||||
|
type_decl = getAst(declare_type(typeName, RootObj))
|
||||||
|
else:
|
||||||
|
if export_class:
|
||||||
|
type_decl = getAst(declare_type_export(typeName, baseName))
|
||||||
|
else:
|
||||||
|
type_decl = getAst(declare_type(typeName, baseName))
|
||||||
|
|
||||||
|
# Inspect the tree structure:
|
||||||
|
#
|
||||||
|
# echo type_decl.treeRepr
|
||||||
|
# --------------------
|
||||||
|
# StmtList
|
||||||
|
# TypeSection
|
||||||
|
# TypeDef
|
||||||
|
# Ident !"Animal"
|
||||||
|
# Empty
|
||||||
|
# RefTy
|
||||||
|
# ObjectTy
|
||||||
|
# Empty
|
||||||
|
# OfInherit
|
||||||
|
# Ident !"RootObj"
|
||||||
|
# Empty <= We want to replace self
|
||||||
|
type_decl[0][0][2][0][2] = recList
|
||||||
|
result.insert(0, type_decl)
|
||||||
|
|
||||||
|
|
||||||
class Animal of RootObj:
|
class Animal of RootObj:
|
||||||
var
|
var
|
||||||
name: string
|
name: string
|
||||||
age: int
|
age: int
|
||||||
|
|
||||||
method init*(name: string, age: int)=
|
method init*(name: string, age: int)=
|
||||||
self.name = name
|
self.name = name
|
||||||
self.age = age
|
self.age = age
|
||||||
echo "I am a new Animal, ", self.name
|
echo "I am a new Animal, ", self.name
|
||||||
|
|
||||||
method stuff(s:string): string = s
|
method stuff(s:string): string = s
|
||||||
method vocalize: string = "..."
|
method vocalize: string = "..."
|
||||||
method age_human_yrs: int = self.age # `self` is injected
|
method age_human_yrs: int = self.age # `self` is injected
|
||||||
|
|
||||||
class Dog of Animal:
|
class Dog of Animal:
|
||||||
method vocalize: string = "woof"
|
method vocalize: string = "woof"
|
||||||
method age_human_yrs: int = self.age * 7
|
method age_human_yrs: int = self.age * 7
|
||||||
|
|
||||||
class Cat of Animal:
|
class Cat of Animal:
|
||||||
method vocalize: string =
|
method vocalize: string =
|
||||||
# call the base class method
|
# call the base class method
|
||||||
self.vocalize_animal() & "meow"
|
self.vocalize_animal() & "meow"
|
||||||
|
|
||||||
class Tiger of Cat:
|
class Tiger of Cat:
|
||||||
method init(name: string="Bob", age: int)=
|
method init(name: string="Bob", age: int)=
|
||||||
self.init_animal(name, age)
|
self.init_animal(name, age)
|
||||||
echo "I am a new tiger"
|
echo "I am a new tiger"
|
||||||
method vocalize: string =
|
method vocalize: string =
|
||||||
# no need for super.super!
|
# no need for super.super!
|
||||||
self.vocalize_animal() & "Rawr!"
|
self.vocalize_animal() & "Rawr!"
|
||||||
|
|
||||||
if isMainModule:
|
if isMainModule:
|
||||||
var animals: seq[Animal] = @[]
|
var animals: seq[Animal] = @[]
|
||||||
animals.add(new Dog(name: "Sparky", age: 10))
|
animals.add(new Dog(name: "Sparky", age: 10))
|
||||||
animals.add(new Cat(name: "Mitten", age: 10))
|
animals.add(new Cat(name: "Mitten", age: 10))
|
||||||
animals.add(new Tiger(name: "Jean", age: 2))
|
animals.add(new Tiger(name: "Jean", age: 2))
|
||||||
|
|
||||||
for a in animals:
|
for a in animals:
|
||||||
echo a.name, " says ", a.vocalize()
|
echo a.name, " says ", a.vocalize()
|
||||||
echo a.age_human_yrs()
|
echo a.age_human_yrs()
|
||||||
|
|
||||||
# prints:
|
# prints:
|
||||||
# I am a new Animal, Sparky
|
# I am a new Animal, Sparky
|
||||||
# I am a new Animal, Mitten
|
# I am a new Animal, Mitten
|
||||||
# I am a new Animal, Jean
|
# I am a new Animal, Jean
|
||||||
# I am a new tiger
|
# I am a new tiger
|
||||||
# Sparky says woof
|
# Sparky says woof
|
||||||
# 70
|
# 70
|
||||||
# Mitten says ...meow
|
# Mitten says ...meow
|
||||||
# 10
|
# 10
|
||||||
# Jean says ...Rawr!
|
# Jean says ...Rawr!
|
||||||
# 2
|
# 2
|
||||||
|
|
|
||||||
Loading…
Add table
Add a link
Reference in a new issue