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') # 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 */ m4_define(CF_RULE, [[$1: CF_rule_$1 ;]]) 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([[,]])