Add Bison-related configure tests.

[dxcommon.git] / t / bison.sh

diff --git a/t/bison.sh b/t/bison.sh
new file mode 100755 (executable)
index 0000000..c21d1bf
--- /dev/null
+++ b/t/bison.sh
@@ -0,0 +1,93 @@
+#!/bin/sh
+#
+# Copyright © 2021 Nick Bowler
+#
+# Fake bison program for testing the bison detection macro.
+#
+# License WTFPL2: Do What The Fuck You Want To Public License, version 2.
+# This is free software: you are free to do what the fuck you want to.
+# There is NO WARRANTY, to the extent permitted by law.
+
+: "${FAKE_BISON_VERSION=2.4.0}"
+
+argv0=$0
+
+infile=
+outheader=
+use_header=false
+
+for arg
+do
+  case $arg in
+  --defines) use_header=true ;;
+  --defines=*) use_header=true outheader=${arg%*=} ;;
+  *.y) infile=$arg ;;
+  esac
+done
+
+if test x"$infile" = x""; then
+  printf '%s: error: no input file\n' "$argv0" 1>&2
+  exit 1
+fi
+
+outfile=${infile%.y}.tab.c
+if $use_header; then
+  test ${outheader:+y} || outheader=${outfile%.c}.h
+  exec 5>"$outheader"
+fi
+exec 3<"$infile" 4>"$outfile"
+
+copy_header=false copy_impl=false
+while read line <&3; do
+  case $line in
+  %require*)
+    save_IFS=$IFS IFS=$IFS\".
+    set x $FAKE_BISON_VERSION 0 0 0; shift
+    fake_major=$1 fake_minor=$2 fake_revision=$3
+    set x ${line#*\"} 0 0 0; shift
+    req_major=$1 req_minor=$2 req_revision=$3
+    IFS=$save_IFS
+    set -x
+    test $fake_major -ge $req_major || exit 1
+    if test $fake_major -eq $req_major; then
+      test $fake_minor -ge $req_minor || exit 1
+      if test $fake_minor -eq $req_minor; then
+        test $fake_revision -ge $req_revision || exit 1
+      fi
+    fi
+    set +x
+    ;;
+  %code*)
+    set x $line; shift
+    case $2 in
+    requires|provides) copy_header=true copy_impl=true ;;
+    top) copy_impl=true ;;
+    esac
+    ;;
+  [}])
+    copy_header=false copy_impl=false
+    ;;
+  %%)
+    break
+    ;;
+  *)
+    $copy_header && printf '%s\n' "$line" >&5
+    $copy_impl && printf '%s\n' "$line" >&4
+    ;;
+  esac
+done
+
+cat >&4 <<EOF
+int yyparse(void)
+{
+  return 0;
+}
+EOF
+
+while read line <&3; do
+  case $line in
+  %%) break;
+  esac
+done
+
+cat <&3 >&4