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authorMartin Mares <mj@ucw.cz>1998-11-27 20:33:53 +0100
committerMartin Mares <mj@ucw.cz>1998-11-27 20:33:53 +0100
commitce6ca80926c0ce87c9a08ea4f4236b1a95846086 (patch)
tree63ec50036c425bd2c76cd681add58a24017120a8 /conf
parent882c588a4060739a4820941cd1c6014bd10ab0db (diff)
downloadbird-ce6ca80926c0ce87c9a08ea4f4236b1a95846086.tar
bird-ce6ca80926c0ce87c9a08ea4f4236b1a95846086.zip
This script takes configuration fragments and generates full Bison grammar
from them.
Diffstat (limited to 'conf')
-rw-r--r--conf/gen_parser.m463
1 files changed, 63 insertions, 0 deletions
diff --git a/conf/gen_parser.m4 b/conf/gen_parser.m4
new file mode 100644
index 0000000..23db068
--- /dev/null
+++ b/conf/gen_parser.m4
@@ -0,0 +1,63 @@
+m4_divert(-1)m4_dnl
+#
+# BIRD -- Generator of Configuration Grammar
+#
+# (c) 1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
+#
+# Can be freely distributed and used under the terms of the GNU GPL.
+#
+
+# Diversions used:
+# 1 includes
+# 2 types etc.
+# 3 rules
+# 4 C code
+
+# Common aliases
+m4_define(DNL, `m4_dnl')
+
+# Define macros for defining sections
+m4_define(CF_ZONE, `m4_divert($1)/* $2 from m4___file__ */')
+m4_define(CF_HDR, `CF_ZONE(1, Headers)')
+m4_define(CF_DECLS, `CF_ZONE(2, Declarations)')
+m4_define(CF_GRAMMAR, `CF_ZONE(3, Grammar)')
+m4_define(CF_CODE, `CF_ZONE(4, C Code)')
+m4_define(CF_END, `m4_divert(-1)')
+
+# Simple iterator
+m4_define(CF_itera, `m4_ifelse($#, 1, [[CF_iter($1)]], [[CF_iter($1)[[]]CF_itera(m4_shift($@))]])')
+m4_define(CF_iterate, `m4_define([[CF_iter]], m4_defn([[$1]]))CF_itera($2)')
+
+# Keywords act as untyped %token
+m4_define(CF_keywd, `m4_ifdef([[CF_tok_$1]],,[[m4_define([[CF_tok_$1]],1)m4_define([[CF_toks]],CF_toks $1)]])')
+m4_define(CF_KEYWORDS, `m4_define([[CF_toks]],[[]])CF_iterate([[CF_keywd]], [[$@]])m4_ifelse(CF_toks,,,%token[[]]CF_toks
+)DNL')
+
+# Dynamic syntax rules
+m4_define(CF_dyn_rules,)
+m4_define(CF_ADDTO, `m4_define([[CF_rule_$1]],m4_ifdef([[CF_rule_$1]],CF_rule_$1 | ,[[m4_define([[CF_dyn_rules]],CF_dyn_rules[[CF_RULE($1)
+]])]])$2)DNL')
+m4_define(CF_RULE, `$1: CF_rule_$1')
+
+# After all configuration templates end, we finally generate the grammar file.
+m4_m4wrap(`
+m4_divert(0)DNL
+%{
+m4_undivert(1)DNL
+%}
+
+m4_undivert(2)DNL
+
+%%
+m4_undivert(3)DNL
+
+/* Dynamic rules */
+
+CF_dyn_rules
+%%
+m4_undivert(4)DNL
+')
+
+# As we are processing C source, we must access all M4 primitives via
+# m4_* and also set different quoting convention: `[[' and ']]'
+m4_changequote([[,]])