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When you redefine a keyword, a warning is issued. It is recommended to abstain from redefining keywords as it may yield lots of strange parse errors in config. It is not possible to use a keyword as a protocol or template name due to collisions in config language.
65 lines
1.6 KiB
Plaintext
65 lines
1.6 KiB
Plaintext
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--1999 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)/* $2 from m4___file__ */')
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m4_define(CF_HDR, `CF_ZONE(1, Headers)')
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m4_define(CF_DEFINES, `CF_ZONE(1, Defines)')
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m4_define(CF_DECLS, `CF_ZONE(2, Declarations)')
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m4_define(CF_GRAMMAR, `CF_ZONE(3, Grammar)')
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m4_define(CF_CODE, `CF_ZONE(4, C Code)')
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m4_define(CF_END, `m4_divert(-1)')
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# Keywords act as a %token <kw> + added to a keyword: rule
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m4_define(CF_KEYWORDS, `m4_ifelse($#,1,,[[CF_KEYWORDS(m4_shift($@))]])DNL
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m4_ifdef([[CF_tok_$1]],,[[m4_define([[CF_tok_$1]],1)m4_divert(2)%token <kw> $1
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m4_divert(3)keyword: $1 ;
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m4_divert(2)]])')
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# CLI commands
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m4_define(CF_CLI, `m4_define([[CF_cmd]], cmd_[[]]m4_translit($1, [[ ]], _))DNL
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m4_divert(2)CF_KEYWORDS(m4_translit($1, [[ ]], [[,]]))
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m4_divert(3)cli_cmd: CF_cmd
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CF_cmd: $1 $2 END')
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m4_define(CF_CLI_CMD, `')
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m4_define(CF_CLI_HELP, `')
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# ENUM declarations are ignored
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m4_define(CF_ENUM, `')
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m4_define(CF_ENUM_PX, `')
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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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%%
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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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