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extern "C" {
#include <lauxlib.h>
#include <lualib.h>
}
#include <boost/format.hpp>
#include "options.hpp"
#include "tagtransform-lua.hpp"
lua_tagtransform_t::lua_tagtransform_t(options_t const *options)
: L(luaL_newstate()), m_node_func(options->tag_transform_node_func.get_value_or(
"filter_tags_node")),
m_way_func(options->tag_transform_way_func.get_value_or("filter_tags_way")),
m_rel_func(
options->tag_transform_rel_func.get_value_or("filter_basic_tags_rel")),
m_rel_mem_func(options->tag_transform_rel_mem_func.get_value_or(
"filter_tags_relation_member")),
m_extra_attributes(options->extra_attributes)
{
luaL_openlibs(L);
luaL_dofile(L, options->tag_transform_script->c_str());
check_lua_function_exists(m_node_func);
check_lua_function_exists(m_way_func);
check_lua_function_exists(m_rel_func);
check_lua_function_exists(m_rel_mem_func);
}
lua_tagtransform_t::~lua_tagtransform_t() { lua_close(L); }
void lua_tagtransform_t::check_lua_function_exists(const std::string &func_name)
{
lua_getglobal(L, func_name.c_str());
if (!lua_isfunction(L, -1)) {
throw std::runtime_error(
(boost::format(
"Tag transform style does not contain a function %1%") %
func_name)
.str());
}
lua_pop(L, 1);
}
bool lua_tagtransform_t::filter_tags(osmium::OSMObject const &o, int *polygon,
int *roads, export_list const &,
taglist_t &out_tags, bool)
{
switch (o.type()) {
case osmium::item_type::node:
lua_getglobal(L, m_node_func.c_str());
break;
case osmium::item_type::way:
lua_getglobal(L, m_way_func.c_str());
break;
case osmium::item_type::relation:
lua_getglobal(L, m_rel_func.c_str());
break;
default:
throw std::runtime_error("Unknown OSM type");
}
lua_newtable(L); /* key value table */
lua_Integer sz = 0;
for (auto const &t : o.tags()) {
lua_pushstring(L, t.key());
lua_pushstring(L, t.value());
lua_rawset(L, -3);
++sz;
}
if (m_extra_attributes && o.version() > 0) {
taglist_t tags;
tags.add_attributes(o);
for (auto const &t : tags) {
lua_pushstring(L, t.key.c_str());
lua_pushstring(L, t.value.c_str());
lua_rawset(L, -3);
}
sz += tags.size();
}
lua_pushinteger(L, sz);
if (lua_pcall(L, 2, (o.type() == osmium::item_type::way) ? 4 : 2, 0)) {
fprintf(stderr,
"Failed to execute lua function for basic tag processing: %s\n",
lua_tostring(L, -1));
/* lua function failed */
return 1;
}
if (o.type() == osmium::item_type::way) {
if (roads) {
*roads = (int)lua_tointeger(L, -1);
}
lua_pop(L, 1);
if (polygon) {
*polygon = (int)lua_tointeger(L, -1);
}
lua_pop(L, 1);
}
lua_pushnil(L);
while (lua_next(L, -2) != 0) {
const char *key = lua_tostring(L, -2);
const char *value = lua_tostring(L, -1);
out_tags.emplace_back(key, value);
lua_pop(L, 1);
}
bool filter = lua_tointeger(L, -2);
lua_pop(L, 2);
return filter;
}
bool lua_tagtransform_t::filter_rel_member_tags(
taglist_t const &rel_tags, osmium::memory::Buffer const &members,
rolelist_t const &member_roles, int *member_superseded, int *make_boundary,
int *make_polygon, int *roads, export_list const &, taglist_t &out_tags,
bool)
{
size_t num_members = member_roles.size();
lua_getglobal(L, m_rel_mem_func.c_str());
lua_newtable(L); /* relations key value table */
for (const auto &rel_tag : rel_tags) {
lua_pushstring(L, rel_tag.key.c_str());
lua_pushstring(L, rel_tag.value.c_str());
lua_rawset(L, -3);
}
lua_newtable(L); /* member tags table */
int idx = 1;
for (auto const &w : members.select<osmium::Way>()) {
lua_pushnumber(L, idx++);
lua_newtable(L); /* member key value table */
for (auto const &member_tag : w.tags()) {
lua_pushstring(L, member_tag.key());
lua_pushstring(L, member_tag.value());
lua_rawset(L, -3);
}
lua_rawset(L, -3);
}
lua_newtable(L); /* member roles table */
for (size_t i = 0; i < num_members; ++i) {
lua_pushnumber(L, i + 1);
lua_pushstring(L, member_roles[i]);
lua_rawset(L, -3);
}
lua_pushnumber(L, num_members);
if (lua_pcall(L, 4, 6, 0)) {
fprintf(
stderr,
"Failed to execute lua function for relation tag processing: %s\n",
lua_tostring(L, -1));
/* lua function failed */
return 1;
}
*roads = (int)lua_tointeger(L, -1);
lua_pop(L, 1);
*make_polygon = (int)lua_tointeger(L, -1);
lua_pop(L, 1);
*make_boundary = (int)lua_tointeger(L, -1);
lua_pop(L, 1);
lua_pushnil(L);
for (size_t i = 0; i < num_members; ++i) {
if (lua_next(L, -2)) {
member_superseded[i] = (int)lua_tointeger(L, -1);
lua_pop(L, 1);
} else {
fprintf(stderr,
"Failed to read member_superseded from lua function\n");
}
}
lua_pop(L, 2);
lua_pushnil(L);
while (lua_next(L, -2) != 0) {
const char *key = lua_tostring(L, -2);
const char *value = lua_tostring(L, -1);
out_tags.push_back(tag_t(key, value));
lua_pop(L, 1);
}
lua_pop(L, 1);
bool filter = lua_tointeger(L, -1);
lua_pop(L, 1);
return filter;
}
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