diff --git a/README.md b/README.md
index 9baac9e..04c7bc1 100644
--- a/README.md
+++ b/README.md
@@ -39,7 +39,7 @@ are regenerated on each release — patches cannot be merged directly.
 Report problems (or send patches) to the author; accepted changes are
 applied to the development tree and appear in a following snapshot.
 
-This snapshot was assembled from development commit `6d767149c26c`.
+This snapshot was assembled from development commit `4e8c3db2882d`.
 
 ## License
 
diff --git a/tst/Makefile b/tst/Makefile
index bed511c..2d7af5d 100644
--- a/tst/Makefile
+++ b/tst/Makefile
@@ -1,10 +1,12 @@
 # Klammertext distribution test suite (subset).
 #
-# Runs the four shell regression suites:
+# Runs the five shell regression suites:
 #   cond_test.sh     — @cond argument delimitation
 #   deftype_test.sh  — the four klammer definition modes + redefinition table
 #   escape_test.sh   — target character escaping and quoted specials
 #   filename_test.sh — filenames with spaces (quoting, " / " lists, rescue)
+#   editor_test.sh   — editor support (doc/edit): indentation and table
+#                      alignment; needs python3, uses Emacs when installed
 #
 # Requires KLAMMERTEXT_HOME set and `ktext` on PATH (build it with `make -C com`).
 
@@ -14,3 +16,4 @@ test:
 	./deftype_test.sh
 	./escape_test.sh
 	./filename_test.sh
+	./editor_test.sh
diff --git a/tst/editor/align_boundary.kt b/tst/editor/align_boundary.kt
new file mode 100644
index 0000000..bafef2f
--- /dev/null
+++ b/tst/editor/align_boundary.kt
@@ -0,0 +1,5 @@
+@table
+  123456789012345678901234567890 | x ||
+  abcdefghijklmnopqrstuvwxyzabcde | y ||
+  short | z ||
+@
diff --git a/tst/editor/align_boundary_expected.kt b/tst/editor/align_boundary_expected.kt
new file mode 100644
index 0000000..8457c10
--- /dev/null
+++ b/tst/editor/align_boundary_expected.kt
@@ -0,0 +1,5 @@
+@table
+  123456789012345678901234567890 | x ||
+  abcdefghijklmnopqrstuvwxyzabcde | y ||
+  short                          | z ||
+@
diff --git a/tst/editor/align_colspan.kt b/tst/editor/align_colspan.kt
new file mode 100644
index 0000000..240c253
--- /dev/null
+++ b/tst/editor/align_colspan.kt
@@ -0,0 +1,4 @@
+@table
+  one | two | three ||
+  spanning | wide ||
+@
diff --git a/tst/editor/align_colspan_expected.kt b/tst/editor/align_colspan_expected.kt
new file mode 100644
index 0000000..185a7bc
--- /dev/null
+++ b/tst/editor/align_colspan_expected.kt
@@ -0,0 +1,4 @@
+@table
+  one      | two  | three ||
+  spanning | wide ||
+@
diff --git a/tst/editor/align_empty_cells.kt b/tst/editor/align_empty_cells.kt
new file mode 100644
index 0000000..c13ecc2
--- /dev/null
+++ b/tst/editor/align_empty_cells.kt
@@ -0,0 +1,4 @@
+@table
+  a | | b ||
+  cc | dd | ee ||
+@
diff --git a/tst/editor/align_empty_cells_expected.kt b/tst/editor/align_empty_cells_expected.kt
new file mode 100644
index 0000000..050785c
--- /dev/null
+++ b/tst/editor/align_empty_cells_expected.kt
@@ -0,0 +1,4 @@
+@table
+  a  |    | b  ||
+  cc | dd | ee ||
+@
diff --git a/tst/editor/align_escapes.kt b/tst/editor/align_escapes.kt
new file mode 100644
index 0000000..bfde32e
--- /dev/null
+++ b/tst/editor/align_escapes.kt
@@ -0,0 +1,4 @@
+@table
+  a ^| b | c ||
+  dd | ee ||
+@
diff --git a/tst/editor/align_escapes_expected.kt b/tst/editor/align_escapes_expected.kt
new file mode 100644
index 0000000..11685d5
--- /dev/null
+++ b/tst/editor/align_escapes_expected.kt
@@ -0,0 +1,4 @@
+@table
+  a ^| b | c  ||
+  dd     | ee ||
+@
diff --git a/tst/editor/align_mixed.kt b/tst/editor/align_mixed.kt
new file mode 100644
index 0000000..f0d2808
--- /dev/null
+++ b/tst/editor/align_mixed.kt
@@ -0,0 +1,12 @@
+Some text before.
+@table :caption Test
+  First item | Second | A third item that's longer ||
+  Row 2 | Text | Not as long ||
+  :column_width f f f
+  A cell that is way way too long to align nicely here | x | y ||
+  Multi | line cell
+  continues here | z ||
+  @b bold @ | @frac 1 | 2 @ ||
+  Last | row | here
+@
+After.
diff --git a/tst/editor/align_mixed_expected.kt b/tst/editor/align_mixed_expected.kt
new file mode 100644
index 0000000..ffabb28
--- /dev/null
+++ b/tst/editor/align_mixed_expected.kt
@@ -0,0 +1,12 @@
+Some text before.
+@table :caption Test
+  First item | Second        | A third item that's longer ||
+  Row 2      | Text          | Not as long                ||
+  :column_width f f f
+  A cell that is way way too long to align nicely here | x | y ||
+  Multi | line cell
+  continues here | z ||
+  @b bold @  | @frac 1 | 2 @ ||
+  Last       | row           | here
+@
+After.
diff --git a/tst/editor/align_too_wide.kt b/tst/editor/align_too_wide.kt
new file mode 100644
index 0000000..4008ab9
--- /dev/null
+++ b/tst/editor/align_too_wide.kt
@@ -0,0 +1,4 @@
+@table
+  xxxxxxxxxxxxxxxxxxxxxxxxxxxx | xxxxxxxxxxxxxxxxxxxxxxxxxxxx | xxxxxxxxxxxxxxxxxxxxxxxxxxxx | xxxxxxxxxxxxxxxxxxxxxxxxxxxx ||
+  xxxxxxxxxxxxxxxxxxxxxxxxxxxx | xxxxxxxxxxxxxxxxxxxxxxxxxxxx | xxxxxxxxxxxxxxxxxxxxxxxxxxxx | xxxxxxxxxxxxxxxxxxxxxxxxxxxx ||
+@
diff --git a/tst/editor/align_too_wide_expected.kt b/tst/editor/align_too_wide_expected.kt
new file mode 100644
index 0000000..4008ab9
--- /dev/null
+++ b/tst/editor/align_too_wide_expected.kt
@@ -0,0 +1,4 @@
+@table
+  xxxxxxxxxxxxxxxxxxxxxxxxxxxx | xxxxxxxxxxxxxxxxxxxxxxxxxxxx | xxxxxxxxxxxxxxxxxxxxxxxxxxxx | xxxxxxxxxxxxxxxxxxxxxxxxxxxx ||
+  xxxxxxxxxxxxxxxxxxxxxxxxxxxx | xxxxxxxxxxxxxxxxxxxxxxxxxxxx | xxxxxxxxxxxxxxxxxxxxxxxxxxxx | xxxxxxxxxxxxxxxxxxxxxxxxxxxx ||
+@
diff --git a/tst/editor/editor_driver.el b/tst/editor/editor_driver.el
new file mode 100644
index 0000000..f1c267d
--- /dev/null
+++ b/tst/editor/editor_driver.el
@@ -0,0 +1,30 @@
+;;; editor_driver.el --- drive the Emacs editor units over fixtures -*- lexical-binding: t; -*-
+
+;; Usage:
+;;   emacs --batch -L EMACSDIR -l klammertext-mode -l klammertext-indent
+;;         -l klammertext-align -l editor_driver.el MODE INFILE OUTFILE ...
+;;
+;; MODE is "indent" or "align"; each triple applies that tool to INFILE and
+;; writes the result to OUTFILE.  Called by editor_test.sh.
+
+(let ((args command-line-args-left))
+  (setq command-line-args-left nil)     ; keep batch Emacs from visiting them
+  (while args
+    (let ((mode (pop args))
+          (in (pop args))
+          (out (pop args)))
+      (with-temp-buffer
+        (insert-file-contents in)
+        (klammertext-mode)
+        (cond
+         ((string= mode "indent")
+          (indent-region (point-min) (point-max)))
+         ((string= mode "align")
+          (goto-char (point-min))
+          (when (search-forward "|" nil t)
+            (goto-char (1- (point))))
+          (klammertext-align-table))
+         (t (error "editor_driver.el: unknown mode %s" mode)))
+        (write-region (point-min) (point-max) out nil 'silent)))))
+
+;;; editor_driver.el ends here
diff --git a/tst/editor/editor_driver.py b/tst/editor/editor_driver.py
new file mode 100644
index 0000000..76b26e6
--- /dev/null
+++ b/tst/editor/editor_driver.py
@@ -0,0 +1,63 @@
+#!/usr/bin/env python3
+"""Drive the Sublime Text editor cores over fixture files, outside Sublime.
+
+Usage: editor_driver.py SUBLIME_DIR (MODE INFILE OUTFILE)...
+
+MODE is `indent` or `align`; each triple applies that tool to INFILE and
+writes the result to OUTFILE.  The Sublime plugin files import without the
+`sublime` module (their try/except guard), so the pure cores run under plain
+python3.  Also asserts the built-in error path (no enclosing table).
+Called by editor_test.sh; exits nonzero on an internal error.
+"""
+
+import sys
+
+
+def apply_indent(KI, s):
+    bols = [0] + [i + 1 for i, ch in enumerate(s)
+                  if ch == '\n' and i + 1 < len(s)]
+    out = s
+    for a, b, new in sorted(KI.reindent_lines(s, bols), reverse=True):
+        out = out[:a] + new + out[b:]
+    return out
+
+
+def apply_align(KA, s):
+    caret = s.index('|') if '|' in s else 0
+    span = KA.enclosing_span(s, caret, KA.ALIGN_KLAMMERS)
+    if span is None:
+        return s
+    _name, cs, ce = span
+    edits, _msg = KA.compute_edits(s[cs:ce])
+    out = s
+    for a, b, new in sorted(edits, reverse=True):
+        out = out[:cs + a] + new + out[cs + b:]
+    return out
+
+
+def main():
+    sublime_dir = sys.argv[1]
+    sys.path.insert(0, sublime_dir)
+    import Klammertext_indent as KI
+    import Klammertext_align as KA
+
+    args = sys.argv[2:]
+    for k in range(0, len(args), 3):
+        mode, infile, outfile = args[k:k + 3]
+        with open(infile) as f:
+            s = f.read()
+        if mode == 'indent':
+            out = apply_indent(KI, s)
+        elif mode == 'align':
+            out = apply_align(KA, s)
+        else:
+            sys.exit("editor_driver.py: unknown mode: " + mode)
+        with open(outfile, 'w') as f:
+            f.write(out)
+
+    # Error path: no enclosing table klammer.
+    assert KA.enclosing_span("no table here\n", 3, KA.ALIGN_KLAMMERS) is None
+
+
+if __name__ == '__main__':
+    main()
diff --git a/tst/editor/indent_defs.kt b/tst/editor/indent_defs.kt
new file mode 100644
index 0000000..3d392b0
--- /dev/null
+++ b/tst/editor/indent_defs.kt
@@ -0,0 +1,12 @@
+@@note.k s :label Note :color 1.0,1.0,0.9
+:level.int 0
+      : Rectangular block for a special note @@
+
+  @@quote.txt ::
+@eval block.block_indent(K) eval@
+   @@
+
+@@@state Word_max
+:desc Maximum words
+        :value 7
+   @@@
diff --git a/tst/editor/indent_defs_expected.kt b/tst/editor/indent_defs_expected.kt
new file mode 100644
index 0000000..50b8475
--- /dev/null
+++ b/tst/editor/indent_defs_expected.kt
@@ -0,0 +1,12 @@
+@@note.k s :label Note :color 1.0,1.0,0.9
+  :level.int 0
+  : Rectangular block for a special note @@
+
+@@quote.txt ::
+  @eval block.block_indent(K) eval@
+@@
+
+@@@state Word_max
+  :desc Maximum words
+  :value 7
+@@@
diff --git a/tst/editor/indent_document.kt b/tst/editor/indent_document.kt
new file mode 100644
index 0000000..39355ca
--- /dev/null
+++ b/tst/editor/indent_document.kt
@@ -0,0 +1,10 @@
+@document :structure plain :text
+     This is a normal paragraph, at the left margin.
+
+  @ol
+One
+    | Two
+     @
+
+   More text after the list.
+  @
diff --git a/tst/editor/indent_document_expected.kt b/tst/editor/indent_document_expected.kt
new file mode 100644
index 0000000..bfd8c44
--- /dev/null
+++ b/tst/editor/indent_document_expected.kt
@@ -0,0 +1,10 @@
+@document :structure plain :text
+This is a normal paragraph, at the left margin.
+
+@ol
+  One
+| Two
+@
+
+More text after the list.
+@
diff --git a/tst/editor/indent_escapes.kt b/tst/editor/indent_escapes.kt
new file mode 100644
index 0000000..3fdc984
--- /dev/null
+++ b/tst/editor/indent_escapes.kt
@@ -0,0 +1,5 @@
+@ol
+      Item one
+   | ^| a literal bar item
+^@ a literal at line
+  @
diff --git a/tst/editor/indent_escapes_expected.kt b/tst/editor/indent_escapes_expected.kt
new file mode 100644
index 0000000..8f11d5e
--- /dev/null
+++ b/tst/editor/indent_escapes_expected.kt
@@ -0,0 +1,5 @@
+@ol
+  Item one
+| ^| a literal bar item
+  ^@ a literal at line
+@
diff --git a/tst/editor/indent_list.kt b/tst/editor/indent_list.kt
new file mode 100644
index 0000000..9e73868
--- /dev/null
+++ b/tst/editor/indent_list.kt
@@ -0,0 +1,11 @@
+@ol
+Item one
+      | Item two
+| Item three
+        @ol
+Embedded item one
+| Embedded item two
+     @
+   | Item four
+| Item five
+     @
diff --git a/tst/editor/indent_list_expected.kt b/tst/editor/indent_list_expected.kt
new file mode 100644
index 0000000..555d47a
--- /dev/null
+++ b/tst/editor/indent_list_expected.kt
@@ -0,0 +1,11 @@
+@ol
+  Item one
+| Item two
+| Item three
+  @ol
+    Embedded item one
+  | Embedded item two
+  @
+| Item four
+| Item five
+@
diff --git a/tst/editor/indent_named_close.kt b/tst/editor/indent_named_close.kt
new file mode 100644
index 0000000..eaa44ba
--- /dev/null
+++ b/tst/editor/indent_named_close.kt
@@ -0,0 +1,10 @@
+@document :structure plain :text
+    Text at the margin.
+  @quote
+Quoted text.
+      quote@
+   document@
+
+    @@mydef arg :
+Body of the definition.
+      mydef@@
diff --git a/tst/editor/indent_named_close_expected.kt b/tst/editor/indent_named_close_expected.kt
new file mode 100644
index 0000000..829f817
--- /dev/null
+++ b/tst/editor/indent_named_close_expected.kt
@@ -0,0 +1,10 @@
+@document :structure plain :text
+Text at the margin.
+@quote
+  Quoted text.
+quote@
+document@
+
+@@mydef arg :
+  Body of the definition.
+mydef@@
diff --git a/tst/editor/indent_table.kt b/tst/editor/indent_table.kt
new file mode 100644
index 0000000..dd00898
--- /dev/null
+++ b/tst/editor/indent_table.kt
@@ -0,0 +1,4 @@
+@table
+First item | Second | A third item that's longer ||
+      Row 2      | Text   | Not as long                ||
+   @
diff --git a/tst/editor/indent_table_expected.kt b/tst/editor/indent_table_expected.kt
new file mode 100644
index 0000000..0876a4f
--- /dev/null
+++ b/tst/editor/indent_table_expected.kt
@@ -0,0 +1,4 @@
+@table
+  First item | Second | A third item that's longer ||
+  Row 2      | Text   | Not as long                ||
+@
diff --git a/tst/editor/indent_untouched.kt b/tst/editor/indent_untouched.kt
new file mode 100644
index 0000000..e92476d
--- /dev/null
+++ b/tst/editor/indent_untouched.kt
@@ -0,0 +1,14 @@
+@code
+def f(x):
+    if x:
+        return 1
+code@
+@eval
+def g(y):
+    return y + 1
+g(2)
+@
+@@@state Word_max
+  :desc A description line
+  :value 7
+@@@
diff --git a/tst/editor/indent_untouched_expected.kt b/tst/editor/indent_untouched_expected.kt
new file mode 100644
index 0000000..e92476d
--- /dev/null
+++ b/tst/editor/indent_untouched_expected.kt
@@ -0,0 +1,14 @@
+@code
+def f(x):
+    if x:
+        return 1
+code@
+@eval
+def g(y):
+    return y + 1
+g(2)
+@
+@@@state Word_max
+  :desc A description line
+  :value 7
+@@@
diff --git a/tst/editor_test.sh b/tst/editor_test.sh
new file mode 100755
index 0000000..f99a9ed
--- /dev/null
+++ b/tst/editor_test.sh
@@ -0,0 +1,123 @@
+#!/bin/bash
+#
+# editor_test.sh — Regression tests for the Klammertext editor support
+# (the Emacs mode's indentation/alignment units and their Sublime Text ports).
+#
+# Why this lives in tst/: the editor code implements the LANGUAGE's structural
+# layer — @-run length, bar-run dimension, ^-escapes, # removal, literal
+# spans, nesting depth — independently of both the SKS and the Klammermachine.
+# tst/ is the SKS-independent tier, and these suites check that the
+# independent implementations of Klammertext's structure agree with the
+# canonical formatting conventions AND with each other.  The klammer names
+# that appear in the fixtures (@ol, @table, @document, @code) are seeded
+# configuration of the editor tools, not SKS dependencies; nothing here runs
+# ktext or loads a klammer set.
+#
+# What is checked, for every fixture pair <name>.kt / <name>_expected.kt in
+# tst/editor/:
+#   * the Sublime Python core's output equals the expected file
+#   * idempotence: the tool applied to the expected file leaves it unchanged
+#   * when Emacs is installed: the Emacs unit's output equals the expected
+#     file, and equals the Python output byte for byte (the sync check across
+#     the SYNC-noted policy lists) — skipped gracefully otherwise
+#
+# The editor code is located automatically: doc/emacs + doc/sublime in the
+# development tree, doc/edit/emacs + doc/edit/sublime in the distribution.
+#
+# Usage: ./editor_test.sh          Requires python3; Emacs is optional.
+# Exit code: 0 if all tests pass, 1 otherwise.
+
+PASS=0
+FAIL=0
+
+red=$'\033[31m'
+green=$'\033[32m'
+bold=$'\033[1m'
+reset=$'\033[0m'
+
+HERE="$(cd "$(dirname "$0")" && pwd)"
+ROOT="$(cd "$HERE/.." && pwd)"
+if [ -d "$ROOT/doc/emacs" ]; then
+    EMACS_DIR="$ROOT/doc/emacs"
+    SUBLIME_DIR="$ROOT/doc/sublime"
+elif [ -d "$ROOT/doc/edit/emacs" ]; then
+    EMACS_DIR="$ROOT/doc/edit/emacs"
+    SUBLIME_DIR="$ROOT/doc/edit/sublime"
+else
+    echo "editor_test.sh: cannot locate the editor support (doc/emacs or doc/edit/emacs)" >&2
+    exit 1
+fi
+FIX="$HERE/editor"
+OUT="$(mktemp -d)"
+trap 'rm -rf "$OUT"' EXIT
+
+INDENT_FIXTURES="indent_list indent_document indent_table indent_untouched
+                 indent_defs indent_escapes indent_named_close"
+ALIGN_FIXTURES="align_mixed align_empty_cells align_boundary align_colspan
+                align_escapes align_too_wide"
+
+# Build the (MODE INFILE OUTFILE) triples: each fixture is run from its input
+# and from its expected file (the idempotence check).
+py_args=()
+el_args=()
+add_fixture() {   # add_fixture MODE NAME
+    local mode="$1" name="$2"
+    py_args+=("$mode" "$FIX/$name.kt"           "$OUT/$name.py.out")
+    py_args+=("$mode" "$FIX/${name}_expected.kt" "$OUT/$name.py.idem")
+    el_args+=("$mode" "$FIX/$name.kt"           "$OUT/$name.el.out")
+    el_args+=("$mode" "$FIX/${name}_expected.kt" "$OUT/$name.el.idem")
+}
+for f in $INDENT_FIXTURES; do add_fixture indent "$f"; done
+for f in $ALIGN_FIXTURES;  do add_fixture align  "$f"; done
+
+# --- run the Sublime Python cores (required) -------------------------------
+if ! command -v python3 >/dev/null 2>&1; then
+    echo "editor_test.sh: python3 not found" >&2
+    exit 1
+fi
+if ! PYTHONDONTWRITEBYTECODE=1 python3 "$FIX/editor_driver.py" "$SUBLIME_DIR" "${py_args[@]}"; then
+    echo "editor_test.sh: the Python driver failed" >&2
+    exit 1
+fi
+
+# --- run the Emacs units (optional) ----------------------------------------
+HAVE_EMACS=0
+if command -v emacs >/dev/null 2>&1; then
+    if emacs --batch -L "$EMACS_DIR" \
+             -l klammertext-mode -l klammertext-indent -l klammertext-align \
+             -l "$FIX/editor_driver.el" "${el_args[@]}" 2>"$OUT/emacs.log"; then
+        HAVE_EMACS=1
+    else
+        echo "${red}FAIL${reset} the Emacs driver failed:" >&2
+        cat "$OUT/emacs.log" >&2
+        FAIL=$((FAIL + 1))
+    fi
+else
+    echo "(Emacs not installed — the Emacs half is skipped; the Python cores still run)"
+fi
+
+# --- compare ---------------------------------------------------------------
+check() {   # check NAME FILE_A FILE_B
+    if diff -q "$2" "$3" >/dev/null 2>&1; then
+        echo "${green}PASS${reset} $1"
+        PASS=$((PASS + 1))
+    else
+        echo "${red}FAIL${reset} $1"
+        diff "$2" "$3" | head -10
+        FAIL=$((FAIL + 1))
+    fi
+}
+
+for f in $INDENT_FIXTURES $ALIGN_FIXTURES; do
+    check "$f (python)"            "$OUT/$f.py.out"  "$FIX/${f}_expected.kt"
+    check "$f (python idempotent)" "$OUT/$f.py.idem" "$FIX/${f}_expected.kt"
+    if [ "$HAVE_EMACS" = 1 ]; then
+        check "$f (emacs)"            "$OUT/$f.el.out"  "$FIX/${f}_expected.kt"
+        check "$f (emacs idempotent)" "$OUT/$f.el.idem" "$FIX/${f}_expected.kt"
+        check "$f (emacs == python)"  "$OUT/$f.el.out"  "$OUT/$f.py.out"
+    fi
+done
+
+echo
+echo "${bold}editor_test: $PASS passed, $FAIL failed${reset}"
+[ "$FAIL" -eq 0 ]