commit ed5918771fcf9877d8445e74c62ab1ce6b8e28c1
author Bram Moolenaar <Bram@vim.org> Sat Aug 15 22:14:53 2020 +0200
committer Bram Moolenaar <Bram@vim.org> Sat Aug 15 22:14:53 2020 +0200
tree 6b2c25678e1d0b606ad7e6b82d2d6528b6b86be8
parent 11107bab7ead9124f46a7ddf6aa3bb66b43a8246

patch 8.2.1463: Vim9: list slice not supported yet

Problem:    Vim9: list slice not supported yet.
Solution:   Add support for list slicing.

src/testdir/test_vim9_disassemble.vim

diff --git a/src/testdir/test_vim9_disassemble.vim b/src/testdir/test_vim9_disassemble.vim
index d901cb0..3ed36f3 100644
--- a/src/testdir/test_vim9_disassemble.vim
+++ b/src/testdir/test_vim9_disassemble.vim
@@ -992,6 +992,28 @@
   assert_equal('b', StringIndex())
 enddef
 
+def StringSlice(): string
+  let s = "abcd"
+  let res = s[1:8]
+  return res
+enddef
+
+def Test_disassemble_string_slice()
+  let instr = execute('disassemble StringSlice')
+  assert_match('StringSlice\_s*' ..
+        'let s = "abcd"\_s*' ..
+        '\d PUSHS "abcd"\_s*' ..
+        '\d STORE $0\_s*' ..
+        'let res = s\[1:8]\_s*' ..
+        '\d LOAD $0\_s*' ..
+        '\d PUSHNR 1\_s*' ..
+        '\d PUSHNR 8\_s*' ..
+        '\d STRSLICE\_s*' ..
+        '\d STORE $1\_s*',
+        instr)
+  assert_equal('bcd', StringSlice())
+enddef
+
 def ListIndex(): number
   let l = [1, 2, 3]
   let res = l[1]
@@ -1016,6 +1038,31 @@
   assert_equal(2, ListIndex())
 enddef
 
+def ListSlice(): list<number>
+  let l = [1, 2, 3]
+  let res = l[1:8]
+  return res
+enddef
+
+def Test_disassemble_list_slice()
+  let instr = execute('disassemble ListSlice')
+  assert_match('ListSlice\_s*' ..
+        'let l = \[1, 2, 3]\_s*' ..
+        '\d PUSHNR 1\_s*' ..
+        '\d PUSHNR 2\_s*' ..
+        '\d PUSHNR 3\_s*' ..
+        '\d NEWLIST size 3\_s*' ..
+        '\d STORE $0\_s*' ..
+        'let res = l\[1:8]\_s*' ..
+        '\d LOAD $0\_s*' ..
+        '\d PUSHNR 1\_s*' ..
+        '\d PUSHNR 8\_s*' ..
+        '\d LISTSLICE\_s*' ..
+        '\d STORE $1\_s*',
+        instr)
+  assert_equal([2, 3], ListSlice())
+enddef
+
 def DictMember(): number
   let d = #{item: 1}
   let res = d.item

src/testdir/test_vim9_expr.vim

diff --git a/src/testdir/test_vim9_expr.vim b/src/testdir/test_vim9_expr.vim
index cae719d..6f3cedf 100644
--- a/src/testdir/test_vim9_expr.vim
+++ b/src/testdir/test_vim9_expr.vim
@@ -2121,6 +2121,34 @@
   CheckScriptSuccess(['vim9script'] + lines)
 enddef
 
+def Test_expr7_list_subscript()
+  let lines =<< trim END
+    let list = [0, 1, 2, 3, 4]
+    assert_equal(0, list[0])
+    assert_equal(4, list[4])
+    assert_equal(4, list[-1])
+    assert_equal(0, list[-5])
+
+    assert_equal([0, 1, 2, 3, 4], list[0:4])
+    assert_equal([0, 1, 2, 3, 4], list[:])
+    assert_equal([1, 2, 3, 4], list[1:])
+    assert_equal([2, 3, 4], list[2:-1])
+    assert_equal([4], list[4:-1])
+    assert_equal([], list[5:-1])
+    assert_equal([], list[999:-1])
+
+    assert_equal([0, 1, 2, 3], list[0:3])
+    assert_equal([0], list[0:0])
+    assert_equal([0, 1, 2, 3, 4], list[0:-1])
+    assert_equal([0, 1, 2], list[0:-3])
+    assert_equal([0], list[0:-5])
+    assert_equal([], list[0:-6])
+    assert_equal([], list[0:-99])
+  END
+  CheckDefSuccess(lines)
+  CheckScriptSuccess(['vim9script'] + lines)
+enddef
+
 def Test_expr7_subscript_linebreak()
   let range = range(
   		3)