diff options
Diffstat (limited to 'navit/command.c')
| -rw-r--r-- | navit/command.c | 1098 |
1 files changed, 1098 insertions, 0 deletions
diff --git a/navit/command.c b/navit/command.c new file mode 100644 index 00000000..9e01bb5b --- /dev/null +++ b/navit/command.c @@ -0,0 +1,1098 @@ +#include <stdio.h> +#include <string.h> +#include <stdarg.h> +#include <stdlib.h> +#include <glib.h> +#include "item.h" +#include "xmlconfig.h" +#include "main.h" +#include "navit.h" +#include "vehicle.h" +#include "speech.h" +#include "gui.h" +#include "debug.h" +#include "callback.h" +#include "command.h" +#include "event.h" +#include "navit_nls.h" + +/* +gui.fullscreen=!gui.fullscreen +gui.menu() +gui.get_data() +zoom_in() +zoom_out() +speech.active=!speech.active +osd_configuration=1 +Not yet: +osd[type=="xxx"].active=0;osd[type=="yyy"].active=0 +*/ + + +struct result { + struct attr attr; + double val; + const char *var; + int varlen; + const char *attrn; + int attrnlen; + int allocated; +}; + +struct context { + struct attr *attr; + int error; + const char *expr; + struct result res; +}; + +struct command_saved_cb { + struct callback *cb; + struct attr attr; +}; + +struct command_saved { + struct context ctx; + struct result res; + char *command; // The command string itself + struct event_idle *idle_ev; // Event to update this command + struct callback *idle_cb; + struct callback *register_cb; // Callback to register all the callbacks + struct event_idle *register_ev; // Idle event to register all the callbacks + struct attr navit; + int num_cbs; + struct command_saved_cb *cbs; // List of callbacks for this saved command + struct callback *cb; // Callback that should be called when we re-evaluate + int error; +}; + +enum error { + no_error=0,missing_closing_brace, missing_colon, wrong_type, illegal_number_format, illegal_character, missing_closing_bracket, invalid_type, not_ready +}; + +static void eval_comma(struct context *ctx, struct result *res); +static struct attr ** eval_list(struct context *ctx); + +static void +result_free(struct result *res) +{ +} + +static int command_register_callbacks(struct command_saved *cs); + +static const char * +get_op(struct context *ctx, int test, ...) +{ + char *op; + const char *ret=NULL; + va_list ap; + + while (g_ascii_isspace(*ctx->expr)) { + ctx->expr++; + } + + va_start(ap, test); + while ((op = va_arg(ap, char *))) { + if (!strncmp(ctx->expr, op, strlen(op))) { + ret=ctx->expr; + if (! test) + ctx->expr+=strlen(op); + break; + } + } + va_end(ap); + return ret; +} + +/*static int +is_int(struct result *res) +{ + return 1; +}*/ + +static int +is_double(struct result *res) +{ + return 0; +} + +static void +dump(struct result *res) +{ +#if 0 + char object[res->varlen+1]; + char attribute[res->attrnlen+1]; + if (res->var) + strncpy(object, res->var, res->varlen); + object[res->varlen]='\0'; + if (res->attrn) + strncpy(attribute, res->attrn, res->attrnlen); + attribute[res->attrnlen]='\0'; + dbg(0,"type:%s\n", attr_to_name(res->attr.type)); + dbg(0,"attribute '%s' from '%s'\n", attribute, object); +#endif +} + +static enum attr_type +command_attr_type(struct result *res) +{ + char attrn[res->attrnlen+1]; + + strncpy(attrn, res->attrn, res->attrnlen); + attrn[res->attrnlen]='\0'; + return attr_from_name(attrn); +} + +static int +command_object_get_attr(struct context *ctx, struct attr *object, enum attr_type attr_type, struct attr *ret) +{ + struct object_func *func=object_func_lookup(object->type); + if (!func || !func->get_attr) + return 0; + return func->get_attr(object->u.data, attr_type, ret, NULL); +} + +static void +command_get_attr(struct context *ctx, struct result *res) +{ + int result; + enum attr_type attr_type=command_attr_type(res); + result=command_object_get_attr(ctx, &res->attr, attr_type, &res->attr); + if (result) { + res->var=res->attrn; + res->varlen=res->attrnlen; + } else { + res->attr.type=attr_none; + res->var=NULL; + res->varlen=0; + } + res->attrn=NULL; + res->attrnlen=0; + dump(res); +} + +static void +command_set_attr(struct context *ctx, struct result *res, struct result *newres) +{ + int result=0; + enum attr_type attr_type=command_attr_type(res); + struct object_func *func=object_func_lookup(res->attr.type); + if (!func || !func->set_attr) + return; + newres->attr.type=attr_type; + result=func->set_attr(res->attr.u.data, &newres->attr); + *res=*newres; +} + +static void +resolve_object(struct context *ctx, struct result *res) +{ + if (res->attr.type == attr_none && res->varlen) { + res->attr=*ctx->attr; + res->attrn=res->var; + res->attrnlen=res->varlen; + res->var=NULL; + res->varlen=0; + } +} + +static void +resolve(struct context *ctx, struct result *res, struct attr *parent) //FIXME What is that parent for? +{ + resolve_object(ctx, res); + if (res->attrn) + command_get_attr(ctx, res); +} + +static double +get_double(struct context *ctx, struct result *res) +{ + resolve(ctx, res, NULL); + return res->val; +} + + + +static int +get_int(struct context *ctx, struct result *res) +{ + resolve(ctx, res, NULL); + if (res->attr.type == attr_none) + return 0; + if (res->attr.type >= attr_type_int_begin && res->attr.type <= attr_type_int_end) { + return res->attr.u.num; + } + if (res->attr.type >= attr_type_double_begin && res->attr.type <= attr_type_double_end) { + return (int) (*res->attr.u.numd); + } + ctx->error=wrong_type; + return 0; +} + + +static char * +get_string(struct context *ctx, struct result *res) +{ + resolve(ctx, res, NULL); + return attr_to_text(&res->attr, NULL, 0); +} + +static void +set_double(struct context *ctx, struct result *res, double val) +{ + result_free(res); + res->val=val; +} + +static void +set_int(struct context *ctx, struct result *res, int val) +{ + result_free(res); + res->attr.type=attr_type_int_begin; + res->attr.u.num=val; +} + + +static void +eval_value(struct context *ctx, struct result *res) { + const char *op; + int len,dots=0; + op=ctx->expr; + res->varlen=0; + res->var=NULL; + res->attrnlen=0; + res->attrn=NULL; + + while (g_ascii_isspace(*op)) { + op++; + } + + if ((op[0] >= 'a' && op[0] <= 'z') || op[0] == '_') { + res->attr.type=attr_none; + res->var=op; + for (;;) { + while ((op[0] >= 'a' && op[0] <= 'z') || op[0] == '_') { + res->varlen++; + op++; + } + if (res->varlen == 3 && !strncmp(res->var,"new",3) && op[0] == ' ') { + res->varlen++; + op++; + } else + break; + } + ctx->expr=op; + return; + } + if ((op[0] >= '0' && op[0] <= '9') || + (op[0] == '.' && op[1] >= '0' && op[1] <= '9') || + (op[0] == '-' && op[1] >= '0' && op[1] <= '9') || + (op[0] == '-' && op[1] == '.' && op[2] >= '0' && op[2] <= '9')) { + while ((op[0] >= '0' && op[0] <= '9') || op[0] == '.' || (res->varlen == 0 && op[0] == '-')) { + if (op[0] == '.') + dots++; + if (dots > 1) { + ctx->error=illegal_number_format; + return; + } + res->varlen++; + op++; + } + if (dots) { + res->val = strtod(ctx->expr, NULL); + res->attr.type=attr_type_double_begin; + res->attr.u.numd=&res->val; + } else { + res->attr.type=attr_type_int_begin; + res->attr.u.num=atoi(ctx->expr); + } + ctx->expr=op; + return; + } + if (op[0] == '"') { + do { + op++; + } while (op[0] != '"'); + res->attr.type=attr_type_string_begin; + len=op-ctx->expr-1; + res->attr.u.str=g_malloc(len+1); + strncpy(res->attr.u.str, ctx->expr+1, len); + res->attr.u.str[len]='\0'; + op++; + ctx->expr=op; + return; + } + ctx->error=illegal_character; +} + +static int +get_next_object(struct context *ctx, struct result *res) { + + while (*ctx->expr) { + res->varlen = 0; + ctx->error = 0; + + eval_value(ctx,res); + + if ((res->attr.type == attr_none) && (res->varlen > 0)) { + if (ctx->expr[0] != '.') { + return 1; // 1 means "this is the final object name" + } else { + return 2; // 2 means "there are more object names following" (e.g. we just hit 'vehicle' in 'vehicle.position_speed' + } + } + + if (ctx->error) { + // Probably hit an operator + ctx->expr++; + } + } + + return 0; +} + +static void +eval_brace(struct context *ctx, struct result *res) +{ + if (get_op(ctx,0,"(",NULL)) { + eval_comma(ctx, res); + if (ctx->error) return; + if (!get_op(ctx,0,")",NULL)) + ctx->error=missing_closing_brace; + return; + } + eval_value(ctx, res); +} + +static void +command_call_function(struct context *ctx, struct result *res) +{ + struct attr cbl,**list=NULL; + char function[res->attrnlen+1]; + if (res->attrn) + strncpy(function, res->attrn, res->attrnlen); + function[res->attrnlen]='\0'; + dbg(1,"function=%s\n", function); + if (ctx->expr[0] != ')') { + list=eval_list(ctx); + if (ctx->error) return; + } + if (!get_op(ctx,0,")",NULL)) { + ctx->error=missing_closing_brace; + return; + } + if (!strcmp(function,"_") && list && list[0] && list[0]->type >= attr_type_string_begin && list[0]->type <= attr_type_string_end) { + res->attr.type=list[0]->type; + res->attr.u.str=g_strdup(gettext(list[0]->u.str)); + + } else if (!strncmp(function,"new ",4)) { + enum attr_type attr_type=attr_from_name(function+4); + if (attr_type != attr_none) { + struct object_func *func=object_func_lookup(attr_type); + if (func && func->create) { + res->attr.type=attr_type; + res->attr.u.data=func->create(NULL, list); + } + } + } else { + if (command_object_get_attr(ctx, &res->attr, attr_callback_list, &cbl)) { + int valid; + struct attr **out=NULL; + dbg(1,"function call %s from %s\n",function, attr_to_name(res->attr.type)); + callback_list_call_attr_4(cbl.u.callback_list, attr_command, function, list, &out, &valid); + if (out && out[0]) { + attr_dup_content(out[0], &res->attr); + attr_list_free(out); + } else + res->attr.type=attr_none; + } else + res->attr.type=attr_none; + } + res->var=NULL; + res->varlen=0; + res->attrn=NULL; + res->attrnlen=0; +} + +static void +eval_postfix(struct context *ctx, struct result *res) +{ + struct result tmp; + const char *op; + + eval_brace(ctx, res); + if (ctx->error) return; + for (;;) { + if (!(op=get_op(ctx,0,"[","(",".",NULL))) + return; + if (op[0] == '.') { + eval_brace(ctx, &tmp); + if (ctx->error) return; + resolve(ctx, res,NULL); + if (ctx->error) return; + res->attrn=tmp.var; + res->attrnlen=tmp.varlen; + dump(res); + } else if (op[0] == '[') { + if (!get_op(ctx,0,"]",NULL)) { + ctx->error=missing_closing_bracket; + return; + } + } else if (op[0] == '(') { + dbg(1,"function call\n"); + resolve_object(ctx, res); + command_call_function(ctx, res); + } + } +} + +static void +eval_unary(struct context *ctx, struct result *res) +{ + const char *op; + op=get_op(ctx,0,"~","!",NULL); + if (op) { + eval_unary(ctx, res); + if (ctx->error) return; + if (op[0] == '~') + set_int(ctx, res, ~get_int(ctx, res)); + else + set_int(ctx, res, !get_int(ctx, res)); + } else + eval_postfix(ctx, res); +} + +static void +eval_multiplicative(struct context *ctx, struct result *res) +{ + struct result tmp; + const char *op; + + eval_unary(ctx, res); + if (ctx->error) return; + for (;;) { + if (!(op=get_op(ctx,0,"*","/","%",NULL))) return; + eval_unary(ctx, &tmp); + if (ctx->error) return; + if (is_double(res) || is_double(&tmp)) { + if (op[0] == '*') + set_double(ctx, res, get_double(ctx, res) * get_double(ctx, &tmp)); + else if (op[0] == '/') + set_double(ctx, res, get_double(ctx, res) / get_double(ctx, &tmp)); + else { + ctx->error=invalid_type; + return; + } + } else { + if (op[0] == '*') + set_int(ctx, res, get_int(ctx, res) * get_int(ctx, &tmp)); + else if (op[0] == '/') + set_int(ctx, res, get_int(ctx, res) / get_int(ctx, &tmp)); + else + set_int(ctx, res, get_int(ctx, res) % get_int(ctx, &tmp)); + } + if (ctx->error) return; + } +} + +static void +eval_additive(struct context *ctx, struct result *res) +{ + struct result tmp; + const char *op; + + eval_multiplicative(ctx, res); + if (ctx->error) return; + for (;;) { + if (!(op=get_op(ctx,0,"-","+",NULL))) return; + eval_multiplicative(ctx, &tmp); + if (ctx->error) return; + if (is_double(res) || is_double(&tmp)) { + if (op[0] == '+') + set_double(ctx, res, get_double(ctx, res) + get_double(ctx, &tmp)); + else + set_double(ctx, res, get_double(ctx, res) - get_double(ctx, &tmp)); + } else { + if (op[0] == '+') + set_int(ctx, res, get_int(ctx, res) + get_int(ctx, &tmp)); + else + set_int(ctx, res, get_int(ctx, res) - get_int(ctx, &tmp)); + } + if (ctx->error) return; + } +} + +static void +eval_equality(struct context *ctx, struct result *res) +{ + struct result tmp; + const char *op; + + eval_additive(ctx, res); + if (ctx->error) return; + for (;;) { + if (!(op=get_op(ctx,0,"==","!=","<=",">=","<",">",NULL))) return; + eval_additive(ctx, &tmp); + if (ctx->error) return; + + switch (op[0]) { + case '=': + set_int(ctx, res, (get_int(ctx, res) == get_int(ctx, &tmp))); + break; + case '!': + set_int(ctx, res, (get_int(ctx, res) != get_int(ctx, &tmp))); + break; + case '<': + if (op[1] == '=') { + set_int(ctx, res, (get_int(ctx, res) <= get_int(ctx, &tmp))); + } else { + set_int(ctx, res, (get_int(ctx, res) < get_int(ctx, &tmp))); + } + break; + case '>': + if (op[1] == '=') { + set_int(ctx, res, (get_int(ctx, res) >= get_int(ctx, &tmp))); + } else { + set_int(ctx, res, (get_int(ctx, res) > get_int(ctx, &tmp))); + } + break; + default: + break; + } + result_free(&tmp); + } +} + + +static void +eval_bitwise_and(struct context *ctx, struct result *res) +{ + struct result tmp; + + eval_equality(ctx, res); + if (ctx->error) return; + for (;;) { + if (get_op(ctx,1,"&&",NULL)) return; + if (!get_op(ctx,0,"&",NULL)) return; + eval_equality(ctx, &tmp); + if (ctx->error) return; + set_int(ctx, res, get_int(ctx, res) & get_int(ctx, &tmp)); + if (ctx->error) return; + } +} + +static void +eval_bitwise_xor(struct context *ctx, struct result *res) +{ + struct result tmp; + + eval_bitwise_and(ctx, res); + if (ctx->error) return; + for (;;) { + if (!get_op(ctx,0,"^",NULL)) return; + eval_bitwise_and(ctx, &tmp); + if (ctx->error) return; + set_int(ctx, res, get_int(ctx, res) ^ get_int(ctx, &tmp)); + if (ctx->error) return; + } +} + +static void +eval_bitwise_or(struct context *ctx, struct result *res) +{ + struct result tmp; + + eval_bitwise_xor(ctx, res); + if (ctx->error) return; + for (;;) { + if (get_op(ctx,1,"||",NULL)) return; + if (!get_op(ctx,0,"|",NULL)) return; + eval_bitwise_xor(ctx, &tmp); + if (ctx->error) return; + set_int(ctx, res, get_int(ctx, res) | get_int(ctx, &tmp)); + if (ctx->error) return; + } +} + +static void +eval_logical_and(struct context *ctx, struct result *res) +{ + struct result tmp; + + eval_bitwise_or(ctx, res); + if (ctx->error) return; + for (;;) { + if (!get_op(ctx,0,"&&",NULL)) return; + eval_bitwise_or(ctx, &tmp); + if (ctx->error) return; + set_int(ctx, res, get_int(ctx, res) && get_int(ctx, &tmp)); + if (ctx->error) return; + } +} + +static void +eval_logical_or(struct context *ctx, struct result *res) +{ + struct result tmp; + + eval_logical_and(ctx, res); + if (ctx->error) return; + for (;;) { + if (!get_op(ctx,0,"||",NULL)) return; + eval_logical_and(ctx, &tmp); + if (ctx->error) return; + set_int(ctx, res, get_int(ctx, res) || get_int(ctx, &tmp)); + if (ctx->error) return; + } +} + +static void +eval_conditional(struct context *ctx, struct result *res) +{ + struct result tmp; + int cond; + + eval_logical_or(ctx, res); + if (ctx->error) return; + if (!get_op(ctx,0,"?",NULL)) return; + cond=!!get_int(ctx, res); + if (ctx->error) return; + eval_logical_or(ctx, &tmp); + if (ctx->error) return; + if (cond) + *res=tmp; + if (!get_op(ctx,0,":",NULL)) { + ctx->error=missing_colon; + return; + } + eval_logical_or(ctx, &tmp); + if (ctx->error) return; + if (!cond) + *res=tmp; +} + +/* = *= /= %= += -= >>= <<= &= ^= |= */ + +static void +eval_assignment(struct context *ctx, struct result *res) +{ + struct result tmp; + eval_conditional(ctx, res); + if (ctx->error) return; + if (!get_op(ctx,0,"=",NULL)) return; + eval_conditional(ctx, &tmp); + if (ctx->error) return; + resolve(ctx, &tmp, NULL); + if (ctx->error) return; + resolve_object(ctx, res); + command_set_attr(ctx, res, &tmp); +} + +/* , */ +static void +eval_comma(struct context *ctx, struct result *res) +{ + struct result tmp; + + eval_assignment(ctx, res); + if (ctx->error) return; + for (;;) { + if (!get_op(ctx,0,",",NULL)) return; + eval_assignment(ctx, &tmp); + if (ctx->error) return; + *res=tmp; + } +} + +static struct attr ** +eval_list(struct context *ctx) +{ + struct result tmp; + + struct attr **ret=NULL; + for (;;) { + eval_assignment(ctx, &tmp); + if (ctx->error) { + attr_list_free(ret); + return NULL; + } + resolve(ctx, &tmp, NULL); + ret=attr_generic_add_attr(ret, &tmp.attr); + if (!get_op(ctx,0,",",NULL)) return ret; + } +} + +#if 0 + +void command(struct attr *attr, char *expr) +{ + struct result res; + struct context ctx; + memset(&res, 0, sizeof(res)); + memset(&ctx, 0, sizeof(ctx)); + ctx.attr=attr; + ctx.error=0; + ctx.expr=expr; + printf("command='%s'\n", expr); + eval_comma(&ctx,&res); + printf("err=%d %s\n", ctx.error, ctx.expr); + dump(&res); + printf("***\n"); + resolve(&ctx, &res, NULL); + dump(&res); + printf("%s\n", get_string(&ctx, &res)); +} +#endif + +static void +command_evaluate_to(struct attr *attr, const char *expr, struct context *ctx, struct result *res) +{ + memset(res, 0, sizeof(*res)); + memset(ctx, 0, sizeof(*ctx)); + ctx->attr=attr; + ctx->expr=expr; + eval_comma(ctx,res); +} + +enum attr_type +command_evaluate_to_attr(struct attr *attr, char *expr, int *error, struct attr *ret) +{ + struct result res; + struct context ctx; + command_evaluate_to(attr, expr, &ctx, &res); + if (ctx.error) + return attr_none; + resolve_object(&ctx, &res); + *ret=res.attr; + dbg(0,"type %s\n",attr_to_name(command_attr_type(&res))); + return command_attr_type(&res); +} + +void +command_evaluate_to_void(struct attr *attr, char *expr, int *error) +{ + struct result res; + struct context ctx; + command_evaluate_to(attr, expr, &ctx, &res); + if (!ctx.error) + resolve(&ctx, &res, NULL); + if (error) + *error=ctx.error; + +} + +char * +command_evaluate_to_string(struct attr *attr, char *expr, int *error) +{ + struct result res; + struct context ctx; + char *ret=NULL; + + command_evaluate_to(attr, expr, &ctx, &res); + if (!ctx.error) + resolve(&ctx, &res, NULL); + if (!ctx.error) + ret=get_string(&ctx, &res); + if (error) + *error=ctx.error; + if (ctx.error) + return NULL; + else + return ret; +} + +int +command_evaluate_to_int(struct attr *attr, char *expr, int *error) +{ + struct result res; + struct context ctx; + int ret=0; + + command_evaluate_to(attr, expr, &ctx, &res); + if (!ctx.error) + resolve(&ctx, &res, NULL); + if (!ctx.error) + ret=get_int(&ctx, &res); + if (error) + *error=ctx.error; + if (ctx.error) + return 0; + else + return ret; +} + +int +command_evaluate_to_boolean(struct attr *attr, const char *expr, int *error) +{ + struct result res; + struct context ctx; + int ret=0; + + command_evaluate_to(attr, expr, &ctx, &res); + if (!ctx.error) + resolve(&ctx, &res, NULL); + if (!ctx.error) { + if (res.attr.type == attr_none) + ret=0; + else if ((res.attr.type >= attr_type_int_begin && res.attr.type <= attr_type_int_end) || + (res.attr.type >= attr_type_double_begin && res.attr.type <= attr_type_double_end)) + ret=get_int(&ctx, &res); + else + ret=res.attr.u.data != NULL; + } + if (error) + *error=ctx.error; + if (ctx.error) + return 0; + else + return ret; +} + +void +command_evaluate(struct attr *attr, const char *expr) +{ + struct result res; + struct context ctx; + memset(&res, 0, sizeof(res)); + memset(&ctx, 0, sizeof(ctx)); + ctx.attr=attr; + ctx.error=0; + ctx.expr=expr; + for (;;) { + eval_comma(&ctx,&res); + if (ctx.error) + return; + resolve(&ctx, &res, NULL); + if (ctx.error) + return; + if (!get_op(&ctx,0,";",NULL)) return; + } +} + +#if 0 +void +command_interpreter(struct attr *attr) +{ + char buffer[4096]; + int size; + for (;;) { + size=read(0, buffer, 4095); + buffer[size]='\0'; + if (size) { + buffer[size-1]='\0'; + } + command(attr, buffer); + } +} +#endif + +static void +command_table_call(struct command_table *table, int count, void *data, char *command, struct attr **in, struct attr ***out, int *valid) +{ + int i; + for (i = 0 ; i < count ; i++) { + if (!strcmp(command,table->command)) { + if (valid) + *valid=1; + table->func(data, command, in, out); + } + table++; + } +} + +void +command_add_table_attr(struct command_table *table, int count, void *data, struct attr *attr) +{ + attr->type=attr_callback; + attr->u.callback=callback_new_attr_3(callback_cast(command_table_call),attr_command, table, count, data); +} + +void +command_add_table(struct callback_list *cbl, struct command_table *table, int count, void *data) +{ + struct attr attr; + command_add_table_attr(table, count, data, &attr); + callback_list_add(cbl, attr.u.callback); +} + +void +command_saved_set_cb (struct command_saved *cs, struct callback *cb) +{ + cs->cb = cb; +} + +int +command_saved_get_int (struct command_saved *cs) +{ + return get_int(&cs->ctx, &cs->res); +} + +int +command_saved_error (struct command_saved *cs) +{ + return cs->error; +} + +static void +command_saved_evaluate_idle (struct command_saved *cs) +{ + // Only run once at a time + if (cs->idle_ev) { + event_remove_idle(cs->idle_ev); + cs->idle_ev = NULL; + } + + command_evaluate_to(&cs->navit, cs->command, &cs->ctx, &cs->res); + + if (!cs->ctx.error) { + cs->error = 0; + + if (cs->cb) { + callback_call_1(cs->cb, cs); + } + } else { + cs->error = cs->ctx.error; + } +} + +static void +command_saved_evaluate(struct command_saved *cs) +{ + if (cs->idle_ev) { + // We're already scheduled for reevaluation + return; + } + + if (!cs->idle_cb) { + cs->idle_cb = callback_new_1(callback_cast(command_saved_evaluate_idle), cs); + } + + cs->idle_ev = event_add_idle(100, cs->idle_cb); +} + +static void +command_saved_callbacks_changed(struct command_saved *cs) +{ + // For now, we delete each and every callback and then re-create them + int i; + struct object_func *func; + struct attr attr; + + if (cs->register_ev) { + event_remove_idle(cs->register_ev); + cs->register_ev = NULL; + } + + attr.type = attr_callback; + + for (i = 0; i < cs->num_cbs; i++) { + func = object_func_lookup(cs->cbs[i].attr.type); + + if (!func->remove_attr) { + dbg(0, "Could not remove command-evaluation callback because remove_attr is missing for type %i!\n", cs->cbs[i].attr.type); + continue; + } + + attr.u.callback = cs->cbs[i].cb; + + func->remove_attr(cs->cbs[i].attr.u.data, &attr); + callback_destroy(cs->cbs[i].cb); + } + + g_free(cs->cbs); + cs->cbs = NULL; + cs->num_cbs = 0; + + // Now, re-create all the callbacks + command_register_callbacks(cs); +} + +static int +command_register_callbacks(struct command_saved *cs) +{ + struct attr prev,cb_attr,attr; + int status; + struct object_func *func; + struct callback *cb; + + attr = cs->navit; + cs->ctx.expr = cs->command; + cs->ctx.attr = &attr; + prev = cs->navit; + + while ((status = get_next_object(&cs->ctx, &cs->res)) != 0) { + resolve(&cs->ctx, &cs->res, NULL); + + if (cs->ctx.error || (cs->res.attr.type == attr_none)) { + // We could not resolve an object, perhaps because it has not been created + return 0; + } + + if (prev.type != attr_none) { + func = object_func_lookup(prev.type); + + if (func->add_attr) { + if (status == 2) { // This is not the final attribute name + cb = callback_new_attr_1(callback_cast(command_saved_callbacks_changed), cs->res.attr.type, (void*)cs); + attr = cs->res.attr; + } else if (status == 1) { // This is the final attribute name + cb = callback_new_attr_1(callback_cast(command_saved_evaluate), cs->res.attr.type, (void*)cs); + cs->ctx.attr = &cs->navit; + } else { + dbg(0, "Error: Strange status returned from get_next_object()\n"); + } + + cs->num_cbs++; + cs->cbs = g_realloc(cs->cbs, (sizeof(struct command_saved_cb) * cs->num_cbs)); + cs->cbs[cs->num_cbs-1].cb = cb; + cs->cbs[cs->num_cbs-1].attr = prev; + + cb_attr.u.callback = cb; + cb_attr.type = attr_callback; + + func->add_attr(prev.u.data, &cb_attr); + + } else { + dbg(0, "Could not add callback because add_attr is missing for type %i}n", prev.type); + } + } + + if (status == 2) { + prev = cs->res.attr; + } else { + prev = cs->navit; + } + } + + command_saved_evaluate_idle(cs); + + return 1; +} + +struct command_saved +*command_saved_new(char *command, struct navit *navit, struct callback *cb) +{ + struct command_saved *ret; + + ret = g_new0(struct command_saved, 1); + ret->command = g_strdup(command); + ret->navit.u.navit = navit; + ret->navit.type = attr_navit; + ret->cb = cb; + ret->error = not_ready; + + if (!command_register_callbacks(ret)) { + // We try this as an idle call again + ret->register_cb = callback_new_1(callback_cast(command_saved_callbacks_changed), ret); + ret->register_ev = event_add_idle(300, ret->register_cb); + } + + return ret; +} + +void +command_saved_destroy(struct command_saved *cs) +{ + g_free(cs->command); + g_free(cs); +} |