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/* --- Grammar access object ------------------------------------------------ */
function pgf_online(options) {
var server = {
// State variables (private):
grammars_url: "/grammars/",
other_grammars_urls: [],
grammar_list: null,
current_grammar_url: null,
// Methods:
switch_grammar: function(grammar_url,cont) {
this.current_grammar_url=this.grammars_url+grammar_url;
if(cont) cont();
},
add_grammars_url: function(grammars_url,cont) {
this.other_grammars_urls.push(grammars_url);
if(cont) cont();
},
switch_to_other_grammar: function(grammar_url,cont) {
this.current_grammar_url=grammar_url;
if(cont) cont();
},
get_grammarlist: function(cont,err) {
if(this.grammar_list) cont(this.grammar_list)
else http_get_json(this.grammars_url+"grammars.cgi",cont,err);
},
get_grammarlists: function(cont,err) { // May call cont several times!
var ds=this.other_grammars_urls;
var n=1+ds.length;
function pair(dir) {
return function(grammar_list){cont(dir,grammar_list,n)}
}
function ignore_error(err) { console.log(err) }
this.get_grammarlist(pair(this.grammars_url),err)
for(var i in ds)
http_get_json(ds[i]+"grammars.cgi",pair(ds[i]),ignore_error);
},
pgf_call: function(cmd,args,cont,err) {
var url=this.current_grammar_url+"?command="+cmd+encodeArgs(args)
http_get_json(url,cont,err);
},
get_languages: function(cont,err) {
this.pgf_call("grammar",{},cont,err);
},
grammar_info: function(cont,err) {
this.pgf_call("grammar",{},cont,err);
},
get_random: function(args,cont,err) { // cat, limit
args.random=Math.random(); // side effect!!
this.pgf_call("random",args,cont,err);
},
linearize: function(args,cont,err) { // tree, to
this.pgf_call("linearize",args,cont,err);
},
complete: function(args,cont,err) { // from, input, cat, limit
this.pgf_call("complete",args,cont,err);
},
parse: function(args,cont,err) { // from, input, cat
this.pgf_call("parse",args,cont,err);
},
translate: function(args,cont,err) { // from, input, cat, to
this.pgf_call("translate",args,cont,err);
},
translategroup: function(args,cont,err) { // from, input, cat, to
this.pgf_call("translategroup",args,cont,err);
},
browse: function(args,cont,err) { // id, format
if(!args.format) args.format="json"; // sife effect!!
this.pgf_call("browse",args,cont,err);
}
};
for(var o in options) server[o]=options[o];
if(server.grammar_list && server.grammar_list.length>0)
server.switch_grammar(server.grammar_list[0]);
return server;
}
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