[test/ysh-every-string] New test for string literal syntax

- OSH vs. YSH
- stripped multi-line vs. regular non-stripped
- command vs. expression mode

Still need J8 strings in expression mode.

And J8 strings need single quotes ''.

test/ysh-every-string.sh

@@ -0,0 +1,177 @@
+#!/usr/bin/env bash
+#
+# Use every kind of YSH string
+#
+# Usage:
+#   test/ysh-every-string.sh <function name>
+
+set -o nounset
+set -o pipefail
+set -o errexit
+
+OSH=${OSH:-bin/osh}
+YSH=${YSH:-bin/ysh}
+
+# Disable for YSH
+#shopt -s parse_sh_arith
+source test/common.sh  # run-test-funcs
+
+# OSH and YSH
+test-legacy-osh-ysh() {
+  for sh in $OSH $YSH; do
+    log "     test-legacy with $sh"
+
+    $sh <<'EOF'
+  echo 'foo
+---'
+
+  echo "foo
+---"
+
+  echo $'fo\x6f
+---'
+
+  #echo u'fooz
+#---'
+EOF
+  done
+}
+
+test-legacy-expr() {
+  for sh in $YSH; do
+    $sh <<'EOF'
+  var x = 'foo
+---'
+  echo $x
+
+  var x = "foo
+---"
+  echo $x
+
+  # I guess this is useful for refactoring
+  var x = $'fo\x6f
+---'
+  echo $x
+
+EOF
+done
+}
+
+test-legacy-multiline() {
+  ### double-quoted is allowed to be multi-line in YSH
+
+  for sh in $YSH; do
+    $sh <<'EOF'
+  echo """
+  foo
+  ---
+  """
+
+  var x = """
+  foo
+  ---
+  """
+  echo $x
+EOF
+done
+}
+
+test-j8() {
+  ### J8 strings are allowed in YSH
+
+  #for sh in $OSH $YSH; do
+  for sh in $YSH; do
+    $sh <<'EOF'
+
+  # Command mode
+
+  echo u'fo\u{6f}
+---'
+
+  echo b'foo
+---'
+
+  # Leading indent of ---
+  echo u'''
+  fo\u{6f}
+  ---
+  '''
+
+  echo b'''
+  fo\u{6f}
+  ---
+  '''
+
+  # Expression mode
+
+  #var x = u'fo\u{6f}
+#---'
+  #echo $x
+EOF
+  done
+}
+
+test-raw() {
+  ### r prefix for raw is allowed in YSH
+
+  #for sh in $OSH $YSH; do
+  for sh in $YSH; do
+    $sh <<'EOF'
+  # Command mode
+
+  echo 'foo
+---'
+
+  echo r'foo
+---'
+
+  echo '''
+  foo
+  ---
+  '''
+
+  echo r'''
+  foo
+  ---
+  '''
+
+  # Expression mode
+
+  var x = 'foo
+---'
+  echo $x
+
+  var x = r'foo
+---'
+  echo $x
+
+  var x = '''
+  foo
+  ---
+  '''
+  echo $x
+
+  var x = r'''
+  foo
+  ---
+  '''
+  echo $x
+
+EOF
+  done
+}
+
+soil-run-py() {
+  run-test-funcs
+}
+
+soil-run-cpp() {
+  ninja _bin/cxx-asan/osh
+  SH=_bin/cxx-asan/osh run-test-funcs
+}
+
+run-for-release() {
+  run-other-suite-for-release ysh-every-string run-test-funcs
+}
+
+"$@"