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Feature #877856 ยป 0030-Optimize-city_can_be_built_here.patch
| common/city.c | ||
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return FALSE;
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}
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/**********************************************************************//**
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Return TRUE iff the ruleset allows founding a city at a tile claimed by
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someone else with the specified action.
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Since a local DiplRel requirement can be against something else than a
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tile an unclaimed tile can't always contradict a local DiplRel
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requirement. With knowledge about what entities each requirement in a
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requirement vector is evaluated against a contradiction can be
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introduced.
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**************************************************************************/
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static bool
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city_on_foreign_tile_is_legal(const struct unit_type *punit_type,
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const struct action *paction)
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{
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struct requirement tile_is_claimed;
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struct requirement tile_is_foreign;
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/* Tile is claimed as a requirement. */
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tile_is_claimed.range = REQ_RANGE_LOCAL;
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tile_is_claimed.survives = FALSE;
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tile_is_claimed.source.kind = VUT_CITYTILE;
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tile_is_claimed.present = TRUE;
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tile_is_claimed.source.value.citytile = CITYT_CLAIMED;
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/* Tile is foreign as a requirement. */
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tile_is_foreign.range = REQ_RANGE_LOCAL;
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tile_is_foreign.survives = FALSE;
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tile_is_foreign.source.kind = VUT_DIPLREL;
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tile_is_foreign.present = TRUE;
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tile_is_foreign.source.value.diplrel = DRO_FOREIGN;
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action_enabler_list_iterate(
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action_enablers_for_action(paction->id), enabler) {
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if (!requirement_fulfilled_by_unit_type(punit_type,
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&(enabler->actor_reqs))) {
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/* This action enabler isn't for this unit type at all. */
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continue;
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}
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if (!(does_req_contradicts_reqs(&tile_is_claimed,
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&(enabler->target_reqs))
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|| does_req_contradicts_reqs(&tile_is_foreign,
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&(enabler->actor_reqs)))) {
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/* This ruleset permits city founding on foreign tiles. */
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return TRUE;
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}
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} action_enabler_list_iterate_end;
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/* This ruleset forbids city founding on foreign tiles. */
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return FALSE;
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}
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/**********************************************************************//**
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Returns TRUE if the given unit can build a city at the given map
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coordinates.
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| ... | ... | |
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/* Foreign tile detection. */
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if (tile_owner(ptile) && tile_owner(ptile) != unit_owner(punit)
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/* The ruleset may allow founding cities on foreign terrain. */
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&& !city_on_foreign_tile_is_legal(unit_type_get(punit), paction)) {
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&& !can_utype_do_act_if_tgt_diplrel(unit_type_get(punit),
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paction->id,
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DRO_FOREIGN, TRUE)) {
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/* Cannot steal borders by settling. This has to be settled by
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* force of arms. */
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continue;
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.