[Freeciv-Dev] Re: Server/ruleset unification [Was [RFC PATCH] init_techs]

[Arien Malec <arien_malec@xxxxxxxxx>]

Attached is an EBNF description describing my proposal for part of the unified
language. I've left off help & server control for now. I've also left off the
spec for attribute_value (which is where all the excitement is at the moment).

Things to note:

1) The normal way to terminate a command is with '\n', but a create or object
set command is terminated with ';\n', since those sorts of commands are likely
to span lines

2) Many of the commands either take a simple attribute or an object spec. An
object spec can always be distingushed by the presence of the reserved word
'object'.

Examples of this syntax:

set fubar 1

create object tech automobile; #Gets created with default characteristics

create object tech automobile
        name = _("Automobile")
        req1 = "Combustion",
        req2 "Steel",
        flags = "Population_Pollution_Inc";

set object tech automobile
        req1 = "None"
        req2 = "None"; #And, doh, this means we don't need my init_techs patch!

Arien 

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syntax                  : simple_syntax | compound_syntax

simple_syntax           : simple_statement '\n'

compound_syntax         : compound_statement ';' '\n'

simple_statement        :
                          simple_set_statement
                        | show_statement
                        | help_statement
                        | control_statement

compound_statement      :
                          object_set_statement
                        | create_statement


create_statement        : 'create' object_spec [attribute_setter_list]

set_statement           :
                          simple_set_statement
                        | object_set_statement

show_statement          : 'show' (attribute_name | object_spec)

simple_set_statement    : 'set' attribute_setter

object_set_statement    | 'set' object_spec [attribute_setter_list]

attribute_setter_list   : attribute_setter [',' attribute_setter_list]

attribute_setter        : attribute_name ['='] attribute_value

object_spec             : 'object' object_type object_name

object_type             :
                          'player'
                        | 'tech'
                        | 'unit'
                        | 'nation'
                        | 'terrain'
                        | 'government'
                        | 'citystyle'
                        | 'building'