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f5140d1027
Most syntactic constructs in BIRD configuration (e.g. protocol options) are defined as keywords, which are distinct from symbols (user-defined names for protocols, variables, ...). That may cause backwards compatibility issue when a new feature is added, as it may collide with existing user names. We can allow keywords to be shadowed by symbols in almost all cases to avoid this issue. This replaces the previous mechanism, where shadowable symbols have to be explictly added to kw_syms.
54 lines
2.1 KiB
Plaintext
54 lines
2.1 KiB
Plaintext
m4_divert(-1)m4_dnl
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#
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# BIRD -- Generator of Configuration Keyword List
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#
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# (c) 1998--2000 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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# Common aliases
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m4_define(DNL, `m4_dnl')
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# Diversions used:
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# 1 keywords
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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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# We include all the headers
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m4_define(CF_HDR, `m4_divert(0)')
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m4_define(CF_DECLS, `m4_divert(-1)')
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m4_define(CF_DEFINES, `m4_divert(-1)')
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# Keywords are translated to C initializers
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m4_define(CF_handle_kw, `m4_divert(1){ "m4_translit($1,[[A-Z]],[[a-z]])", $1, NULL },
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m4_divert(-1)')
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m4_define(CF_keywd, `m4_ifdef([[CF_tok_$1]],,[[m4_define([[CF_tok_$1]],1)CF_handle_kw($1)]])')
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m4_define(CF_KEYWORDS, `m4_define([[CF_toks]],[[]])CF_iterate([[CF_keywd]], [[$@]])m4_ifelse(CF_toks,,,%token[[]]CF_toks
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)DNL')
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m4_define(CF_KEYWORDS_EXCLUSIVE, `CF_KEYWORDS($@)')
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# CLI commands generate keywords as well
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m4_define(CF_CLI, `CF_KEYWORDS(m4_translit($1, [[ ]], [[,]]))
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')
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# Enums are translated to C initializers: use CF_ENUM(typename, prefix, values)
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# For different prefix: CF_ENUM_PX(typename, external prefix, C prefix, values)
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m4_define(CF_enum, `m4_divert(1){ "CF_enum_prefix_ext[[]]$1", -((CF_enum_type<<16) | CF_enum_prefix_int[[]]$1), NULL },
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m4_divert(-1)')
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m4_define(CF_ENUM, `m4_define([[CF_enum_type]],$1)m4_define([[CF_enum_prefix_ext]],$2)m4_define([[CF_enum_prefix_int]],$2)CF_iterate([[CF_enum]], [[m4_shift(m4_shift($@))]])DNL')
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m4_define(CF_ENUM_PX, `m4_define([[CF_enum_type]],$1)m4_define([[CF_enum_prefix_ext]],$2)m4_define([[CF_enum_prefix_int]],$3)CF_iterate([[CF_enum]], [[m4_shift(m4_shift(m4_shift($@)))]])DNL')
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# After all configuration templates end, we generate the
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m4_m4wrap(`
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m4_divert(0)
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static struct keyword keyword_list[] = {
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m4_undivert(1){ NULL, -1, NULL } };
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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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