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/* --- Grammar Manager object ----------------------------------------------- */
/*
This object stores the state for:
- grammar
- startcat
- languages
Hooks which actions can be hooked to:
- onload
- change_grammar
- change_startcat
- change_languages
*/
function GrammarManager(server,opts) {
var t = this;
/* --- Configuration ---------------------------------------------------- */
// default values
this.options = {
initial: {}
};
this.actions = {
onload: [
function(gm){ debug("default action: onload"); }
],
change_grammar: [
function(grammar){ debug("default action: change grammar"); }
],
change_startcat: [
function(startcat){ debug("default action: change startcat"); }
],
change_languages: [
function(languages){ debug("default action: change languages"); }
]
}
// Apply supplied options
if(opts) for(var o in opts) this.options[o]=opts[o];
/* --- Client state initialisation -------------------------------------- */
this.server = server;
this.grammar = null; // current grammar
this.grammars=[];
this.grammar_dirs=[];
this.startcat = null; // current startcat
this.languages = this.options.initial.languages || [];
// current languages (empty means all langs)
/* --- Main program, this gets things going ----------------------------- */
this.init=function(){
this.server.get_grammarlists(bind(this.onload,this));
}
this.init();
}
//
//GrammarManager.prototype.update_grammar_list=function(dir,grammar_names,dir_count) {
GrammarManager.prototype.onload=function(dir,grammar_names,dir_count) {
var t=this;
t.grammars=[];
t.grammar_dirs=[];
t.grammar_dirs.push(dir);
t.grammars=t.grammars.concat(grammar_names.map(function(g){return dir+g}));
var grammar0=t.options.initial.grammar || t.grammars[0];
t.change_grammar(grammar0);
// Execute hooked actions
t.run_actions("onload",dir,grammar_names,dir_count);
}
/* --- Registering / unregistering actions to hooks ------------------------- */
GrammarManager.prototype.register_action=function(hook,action) {
var hookring = this.actions[hook];
hookring.push(action);
}
GrammarManager.prototype.unregister_action=function(hook,action) {
var hookring = this.actions[hook];
for (var f=0; f < hookring.length; f++) {
if (hookring[f] == action) {
hookring = Array.remove(hookring, f);
}
}
}
// Execute actions for a given hook
// TODO: any number of arguments
GrammarManager.prototype.run_actions=function(hook,arg1,arg2,arg3) {
var acts = this.actions[hook];
for (f in acts) {
acts[f](arg1,arg2,arg3);
}
}
/* --- Grammar -------------------------------------------------------------- */
// API
GrammarManager.prototype.change_grammar=function(grammar_url) {
var t=this;
t.server.switch_to_other_grammar(grammar_url, function() {
t.server.grammar_info(function(grammar){
// Set internal state
t.grammar = grammar;
// Call internal functions
t.update_startcat(grammar);
t.update_language_list(grammar);
// Execute hooked actions
t.run_actions("change_grammar",grammar);
});
});
}
/* --- Start category ------------------------------------------------------- */
// Internal
// Sets default startcat for grammar
GrammarManager.prototype.update_startcat=function(grammar) {
var t=this;
var cats=grammar.categories;
var startcat0 = t.options.initial.startcat;
if (elem(startcat0, cats))
t.startcat = startcat0;
else
t.startcat = grammar.startcat;
}
// API
GrammarManager.prototype.change_startcat=function(startcat) {
var t = this;
// Set internal state
t.startcat = startcat;
// Call internal functions
// ...
// Execute hooked actions
t.run_actions("change_startcat",startcat);
}
/* --- Languages ------------------------------------------------------------ */
// Internal
// Sets default languages for grammar
GrammarManager.prototype.update_language_list=function(grammar) {
var t = this;
function langpart(conc,abs) { // langpart("FoodsEng","Foods") == "Eng"
return hasPrefix(conc,abs) ? conc.substr(abs.length) : conc;
}
// Replace the options in the menu with the languages in the grammar
var langs=grammar.languages;
for(var i=0; i<langs.length; i++) {
var ln=langs[i].name; // "PhrasebookEng"
if(!hasPrefix(ln,"Disamb")) {
var lp=langpart(ln,grammar.name); // "Eng"
if (elem(lp, t.options.initial.languages)) {
t.languages.push(ln);
}
}
}
}
// API
GrammarManager.prototype.change_languages=function(languages) {
var t = this;
// Set internal state
t.languages = languages;
// Call internal functions
// ...
// Execute hooked actions
t.run_actions("change_languages",languages);
}
|
