63 lines
1.7 KiB
Text
63 lines
1.7 KiB
Text
m4_divert(-1)m4_dnl
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#
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# BIRD -- Generator of Configuration Grammar
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#
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# (c) 1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
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#
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# Can be freely distributed and used under the terms of the GNU GPL.
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#
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# Diversions used:
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# 1 includes
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# 2 types etc.
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# 3 rules
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# 4 C code
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# Common aliases
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m4_define(DNL, `m4_dnl')
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# Define macros for defining sections
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m4_define(CF_ZONE, `m4_divert($1)/* $2 from m4___file__ */')
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m4_define(CF_HDR, `CF_ZONE(1, Headers)')
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m4_define(CF_DECLS, `CF_ZONE(2, Declarations)')
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m4_define(CF_GRAMMAR, `CF_ZONE(3, Grammar)')
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m4_define(CF_CODE, `CF_ZONE(4, C Code)')
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m4_define(CF_END, `m4_divert(-1)')
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# Simple iterator
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m4_define(CF_itera, `m4_ifelse($#, 1, [[CF_iter($1)]], [[CF_iter($1)[[]]CF_itera(m4_shift($@))]])')
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m4_define(CF_iterate, `m4_define([[CF_iter]], m4_defn([[$1]]))CF_itera($2)')
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# Keywords act as untyped %token
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m4_define(CF_keywd, `m4_ifdef([[CF_tok_$1]],,[[m4_define([[CF_tok_$1]],1)m4_define([[CF_toks]],CF_toks $1)]])')
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m4_define(CF_KEYWORDS, `m4_define([[CF_toks]],[[]])CF_iterate([[CF_keywd]], [[$@]])m4_ifelse(CF_toks,,,%token[[]]CF_toks
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)DNL')
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# Dynamic syntax rules
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m4_define(CF_dyn_rules,)
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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)
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]])]])$2)DNL')
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m4_define(CF_RULE, `$1: CF_rule_$1')
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# After all configuration templates end, we finally generate the grammar file.
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m4_m4wrap(`
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m4_divert(0)DNL
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%{
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m4_undivert(1)DNL
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%}
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m4_undivert(2)DNL
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%%
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m4_undivert(3)DNL
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/* Dynamic rules */
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CF_dyn_rules
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%%
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m4_undivert(4)DNL
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')
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# As we are processing C source, we must access all M4 primitives via
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# m4_* and also set different quoting convention: `[[' and ']]'
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m4_changequote([[,]])
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