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| author | Martin Mares <mj@ucw.cz> | 1998-11-27 20:33:53 +0100 |
|---|---|---|
| committer | Martin Mares <mj@ucw.cz> | 1998-11-27 20:33:53 +0100 |
| commit | ce6ca80926c0ce87c9a08ea4f4236b1a95846086 (patch) | |
| tree | 63ec50036c425bd2c76cd681add58a24017120a8 /conf | |
| parent | 882c588a4060739a4820941cd1c6014bd10ab0db (diff) | |
| download | bird-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.m4 | 63 |
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([[,]]) |