Pidgin BNF syntax of VCL

git-svn-id: svn+ssh://projects.linpro.no/svn/varnish/trunk@1292 d4fa192b-c00b-0410-8231-f00ffab90ce4

diff --git a/varnish-cache/lib/libvcl/syntax.txt b/varnish-cache/lib/libvcl/syntax.txt
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+# Manually maintained syntax description of VCL
+#
+# $Id$
+#
+
+vcl_program:
+       prog_element
+       vcl_program prog_element
+
+prog_element:
+       acl
+       function
+       backend
+
+function:
+       'sub' ident compound
+
+compound:
+       '{' statements '}'
+
+statements:
+       statement
+       statements statement
+
+statement:
+       compound
+       if_stmt
+       action
+
+if_stmt:
+       'if' conditional compound elseifparts elsepart
+
+elseifparts:
+       <none>
+       elseifpart
+       elseifparts elseifpart
+
+elseifpart:
+       'elseif' conditional compound
+
+elsepart:
+       <none>
+       'else' compound
+
+conditional:   
+       '(' cond_0 ')'
+
+cond_0:
+       cond_1
+       cond_0 '||' cond_1
+
+cond_1:
+       cond_2
+       cond_1 '&&' cond_2
+
+cond_2:
+       cond_3
+       '!' cond_3
+
+cond_3:
+       '(' cond_0 ')'
+       var_int cond_int
+       var_size cond_size
+       var_bool 
+       var_ip cond_ip
+       var_string cond_string
+       var_time cond_time
+       var_backend 
+
+cond_int:
+       '==' cnum
+       '!=' cnum
+       '<=' cnum
+       '>=' cnum
+       '<' cnum
+       '>' cnum
+
+cond_size:
+       cond_int size_unit
+
+conf_time:
+       cond_int time_unit
+
+time_unit:
+       's'
+       'm'
+       'h'
+       'd'
+
+size_unit:
+       'kb'
+       'mb'
+       'Mb'
+       'gb'
+       'Gb'
+
+cond_string:
+       '~' regexp
+       '==' cstr
+       '!=' cstr
+       
+cond_ip:
+
+regexp:
+       cstr
+
+backend:
+       'backend' ident '{' be_decls '}'
+
+be_decls:
+       be_decl
+       be_decls be_decl
+
+be_decl:
+       'set' be_string '=' cstr ';'
+       'set' be_time '=' cnum time_unit ';'
+
+action:
+       'no_new_cache' ';'
+       'no_cache' ';'
+       return_action ';'
+       'error' cnum cstr ';'
+       'error' cstr ';'
+       'error' cnum ';'
+       'error' ';'
+       'switch_config' ident ';'
+       'call' ident ';'
+       'rewrite' cstr cstr ';'
+       'set' assignment ';'
+
+# see variable 'returns' in vcc_gen_fixed_token.tcl
+return_action:
+       'lookup'
+       'hash'
+       'pipe'
+       'pass'
+       'fetch'
+       'insert'
+       'deliver'
+       'discard'
+
+assignment:
+       var_int ratio
+       var_int assign_int
+       var_size ratio
+       var_size assign_int size_unit 
+       var_rate ratio
+       var_rate assign_int size_unit '/' time_unit 
+       var_time ratio
+       var_time assign_int time_unit
+       var_float ratio
+       var_float '+=' double
+       var_float '-=' double
+       var_float '=' double
+       var_backend '=' ident
+
+assign_int:
+       '+=' cnum
+       '-=' cnum
+       '=' cnum
+
+ratio:
+       '*=' double
+       '/=' double
+
+acl:
+       'acl' ident '{' rules '}'
+
+rules:
+       rule
+       rules rule
+
+rule:
+       '(' not rule0 ')' ';'
+       not rule0 ';'
+
+not:
+       <nothing>
+       '!'
+
+rule0:
+       cstr
+       cstr '/' cnum
+       '!' cstr
+
+cstr:  (string constant)
+
+cnum:  (numeric constant)
+
+double:        (floating point constant)
+
+ident: (identifier)