eval: Add special variables v:false, v:null, v:none

3 files changed, 186 insertions, 3 deletions

diff --git a/test/functional/eval/msgpack_functions_spec.lua b/test/functional/eval/msgpack_functions_spec.lua
index fc0aad7902..0c91471656 100644
--- a/test/functional/eval/msgpack_functions_spec.lua
+++ b/test/functional/eval/msgpack_functions_spec.lua
@@ -1,5 +1,6 @@
 local helpers = require('test.functional.helpers')
 local clear = helpers.clear
+local funcs = helpers.funcs
 local eval, eq = helpers.eval, helpers.eq
 local execute = helpers.execute
 local nvim = helpers.nvim
@@ -517,6 +518,19 @@ describe('msgpackdump() function', function()
     eq({'\129\128\128'}, eval('msgpackdump([todump])'))
   end)
 
+  it('can dump v:true', function()
+    eq({'\195'}, funcs.msgpackdump({true}))
+  end)
+
+  it('can dump v:false', function()
+    eq({'\194'}, funcs.msgpackdump({false}))
+  end)
+
+  it('can v:null', function()
+    execute('let todump = v:null')
+    eq({'\192'}, eval('msgpackdump([todump])'))
+  end)
+
   it('can dump special ext mapping', function()
     execute('let todump = {"_TYPE": v:msgpack_types.ext, "_VAL": [5, ["",""]]}')
     eq({'\212\005', ''}, eval('msgpackdump([todump])'))
@@ -620,6 +634,11 @@ describe('msgpackdump() function', function()
        exc_exec('call msgpackdump([todump])'))
   end)
 
+  it('fails to dump v:none', function()
+    eq('Vim(call):E953: Attempt to convert v:none in msgpackdump() argument, index 0, itself',
+       exc_exec('call msgpackdump([v:none])'))
+  end)
+
   it('fails when called with no arguments', function()
     eq('Vim(call):E119: Not enough arguments for function: msgpackdump',
        exc_exec('call msgpackdump()'))
@@ -654,4 +673,11 @@ describe('msgpackdump() function', function()
     eq('Vim(call):E686: Argument of msgpackdump() must be a List',
        exc_exec('call msgpackdump(0.0)'))
   end)
+
+  it('fails to dump special value', function()
+    for _, val in ipairs({'v:true', 'v:false', 'v:null', 'v:none'}) do
+      eq('Vim(call):E686: Argument of msgpackdump() must be a List',
+        exc_exec('call msgpackdump(' .. val .. ')'))
+    end
+  end)
 end)
diff --git a/test/functional/eval/special_vars_spec.lua b/test/functional/eval/special_vars_spec.lua
index 7adc529c88..c7df847946 100644
--- a/test/functional/eval/special_vars_spec.lua
+++ b/test/functional/eval/special_vars_spec.lua
@@ -1,8 +1,12 @@
 local helpers = require('test.functional.helpers')
+local exc_exec = helpers.exc_exec
 local execute = helpers.execute
+local meths = helpers.meths
 local funcs = helpers.funcs
+local meths = helpers.meths
 local clear = helpers.clear
 local eval = helpers.eval
+local eq = helpers.eq
 
 describe('Special values', function()
   before_each(clear)
@@ -17,20 +21,166 @@ describe('Special values', function()
         endtry
       endfunction
     ]])
-    eq(true, funcs.Test())
+    eq(0, exc_exec('call Test()'))
   end)
 
   it('work with empty()', function()
     eq(0, funcs.empty(true))
     eq(1, funcs.empty(false))
-    eq(1, funcs.empty(nil))
+    eq(1, eval('empty(v:null)'))
     eq(1, eval('empty(v:none)'))
   end)
 
   it('can be stringified and eval’ed back', function()
     eq(true, funcs.eval(funcs.string(true)))
     eq(false, funcs.eval(funcs.string(false)))
-    eq(nil, funcs.eval(funcs.string(nil)))
+    eq(nil, eval('eval(string(v:null))'))
     eq(1, eval('eval(string(v:none)) is# v:none'))
   end)
+
+  it('work with is/isnot properly', function()
+    eq(1, eval('v:none is v:none'))
+    eq(0, eval('v:none is v:null'))
+    eq(0, eval('v:none is v:true'))
+    eq(0, eval('v:none is v:false'))
+    eq(1, eval('v:null is v:null'))
+    eq(0, eval('v:null is v:true'))
+    eq(0, eval('v:null is v:false'))
+    eq(1, eval('v:true is v:true'))
+    eq(0, eval('v:true is v:false'))
+    eq(1, eval('v:false is v:false'))
+
+    eq(0, eval('v:none  is 0'))
+    eq(0, eval('v:null  is 0'))
+    eq(0, eval('v:true  is 0'))
+    eq(0, eval('v:false is 0'))
+
+    eq(0, eval('v:none  is 1'))
+    eq(0, eval('v:null  is 1'))
+    eq(0, eval('v:true  is 1'))
+    eq(0, eval('v:false is 1'))
+
+    eq(0, eval('v:none  is ""'))
+    eq(0, eval('v:null  is ""'))
+    eq(0, eval('v:true  is ""'))
+    eq(0, eval('v:false is ""'))
+
+    eq(0, eval('v:none  is "none"'))
+    eq(0, eval('v:null  is "null"'))
+    eq(0, eval('v:true  is "true"'))
+    eq(0, eval('v:false is "false"'))
+
+    eq(0, eval('v:none  is []'))
+    eq(0, eval('v:null  is []'))
+    eq(0, eval('v:true  is []'))
+    eq(0, eval('v:false is []'))
+
+    eq(0, eval('v:none isnot v:none'))
+    eq(1, eval('v:none isnot v:null'))
+    eq(1, eval('v:none isnot v:true'))
+    eq(1, eval('v:none isnot v:false'))
+    eq(0, eval('v:null isnot v:null'))
+    eq(1, eval('v:null isnot v:true'))
+    eq(1, eval('v:null isnot v:false'))
+    eq(0, eval('v:true isnot v:true'))
+    eq(1, eval('v:true isnot v:false'))
+    eq(0, eval('v:false isnot v:false'))
+
+    eq(1, eval('v:none  isnot 0'))
+    eq(1, eval('v:null  isnot 0'))
+    eq(1, eval('v:true  isnot 0'))
+    eq(1, eval('v:false isnot 0'))
+
+    eq(1, eval('v:none  isnot 1'))
+    eq(1, eval('v:null  isnot 1'))
+    eq(1, eval('v:true  isnot 1'))
+    eq(1, eval('v:false isnot 1'))
+
+    eq(1, eval('v:none  isnot ""'))
+    eq(1, eval('v:null  isnot ""'))
+    eq(1, eval('v:true  isnot ""'))
+    eq(1, eval('v:false isnot ""'))
+
+    eq(1, eval('v:none  isnot "none"'))
+    eq(1, eval('v:null  isnot "null"'))
+    eq(1, eval('v:true  isnot "true"'))
+    eq(1, eval('v:false isnot "false"'))
+
+    eq(1, eval('v:none  isnot []'))
+    eq(1, eval('v:null  isnot []'))
+    eq(1, eval('v:true  isnot []'))
+    eq(1, eval('v:false isnot []'))
+  end)
+
+  it('work with +/-/* properly', function()
+    eq(1, eval('0 + v:true'))
+    eq(0, eval('0 + v:none'))
+    eq(0, eval('0 + v:null'))
+    eq(0, eval('0 + v:false'))
+
+    eq(-1, eval('0 - v:true'))
+    eq( 0, eval('0 - v:none'))
+    eq( 0, eval('0 - v:null'))
+    eq( 0, eval('0 - v:false'))
+
+    eq(1, eval('1 * v:true'))
+    eq(0, eval('1 * v:none'))
+    eq(0, eval('1 * v:null'))
+    eq(0, eval('1 * v:false'))
+  end)
+
+  it('does not work with +=/-=/.=', function()
+    meths.set_var('true', true)
+    meths.set_var('false', false)
+    execute('let none = v:none')
+    execute('let null = v:null')
+
+    eq('Vim(let):E734: Wrong variable type for +=', exc_exec('let true  += 1'))
+    eq('Vim(let):E734: Wrong variable type for +=', exc_exec('let false += 1'))
+    eq('Vim(let):E734: Wrong variable type for +=', exc_exec('let none  += 1'))
+    eq('Vim(let):E734: Wrong variable type for +=', exc_exec('let null  += 1'))
+
+    eq('Vim(let):E734: Wrong variable type for -=', exc_exec('let true  -= 1'))
+    eq('Vim(let):E734: Wrong variable type for -=', exc_exec('let false -= 1'))
+    eq('Vim(let):E734: Wrong variable type for -=', exc_exec('let none  -= 1'))
+    eq('Vim(let):E734: Wrong variable type for -=', exc_exec('let null  -= 1'))
+
+    eq('Vim(let):E734: Wrong variable type for .=', exc_exec('let true  .= 1'))
+    eq('Vim(let):E734: Wrong variable type for .=', exc_exec('let false .= 1'))
+    eq('Vim(let):E734: Wrong variable type for .=', exc_exec('let none  .= 1'))
+    eq('Vim(let):E734: Wrong variable type for .=', exc_exec('let null  .= 1'))
+  end)
+
+  it('work with . (concat) properly', function()
+    eq("true", eval('"" . v:true'))
+    eq("none", eval('"" . v:none'))
+    eq("null", eval('"" . v:null'))
+    eq("false", eval('"" . v:false'))
+  end)
+
+  it('work with type()', function()
+    eq(6, funcs.type(true))
+    eq(6, funcs.type(false))
+    eq(7, eval('type(v:null)'))
+    eq(7, eval('type(v:none)'))
+  end)
+
+  it('work with copy() and deepcopy()', function()
+    eq(true, funcs.deepcopy(true))
+    eq(false, funcs.deepcopy(false))
+    eq(nil, eval('deepcopy(v:null)'))
+    eq(nil, eval('deepcopy(v:none)'))
+
+    eq(true, funcs.copy(true))
+    eq(false, funcs.copy(false))
+    eq(nil, eval('copy(v:null)'))
+    eq(nil, eval('copy(v:none)'))
+  end)
+
+  it('fails in index', function()
+    eq('Vim(echo):E15: Cannot index a special value', exc_exec('echo v:true[0]'))
+    eq('Vim(echo):E15: Cannot index a special value', exc_exec('echo v:false[0]'))
+    eq('Vim(echo):E15: Cannot index a special value', exc_exec('echo v:none[0]'))
+    eq('Vim(echo):E15: Cannot index a special value', exc_exec('echo v:null[0]'))
+  end)
 end)
diff --git a/test/functional/eval/string_spec.lua b/test/functional/eval/string_spec.lua
index f7f5dca70a..fe79708910 100644
--- a/test/functional/eval/string_spec.lua
+++ b/test/functional/eval/string_spec.lua
@@ -28,6 +28,13 @@ describe('string() function', function()
       eq('0.0', eval('string(0.0)'))
     end)
 
+    it('dumps special v: values', function()
+      eq('v:true', eval('string(v:true)'))
+      eq('v:false', eval('string(v:false)'))
+      eq('v:none', eval('string(v:none)'))
+      eq('v:null', eval('string(v:null)'))
+    end)
+
     it('dumps values with at most six digits after the decimal point',
     function()
       eq('1.234568e-20', funcs.string(1.23456789123456789123456789e-020))