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pgf_online.js: error callbacks

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To enable customized error handling, the methods in the pgf_online objects and
the AJAX server call functions in support.js accept an error callback function
as an extra argument, in addition to the callback (continuation) for normal
results.
This commit is contained in:
hallgren
2012-03-22 14:09:53 +00:00
parent 891ef8e08a
commit f899d54057
2 changed files with 57 additions and 29 deletions
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68
src/www/minibar/pgf_online.js
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@@ -5,48 +5,74 @@ 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();
},
get_grammarlist: function(cont) {
http_get_json(this.grammars_url+"grammars.cgi",cont);
add_grammars_url: function(grammars_url,cont) {
this.other_grammars_urls.push(grammars_url);
if(cont) cont();
},
pgf_call: function(cmd,args,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!
function pair(dir) {
return function(grammar_list){cont(dir,grammar_list)}
}
function ignore_error(err) { console.log(err) }
this.get_grammarlist(pair(this.grammars_url),err)
var ds=this.other_grammars_urls;
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);
http_get_json(url,cont,err);
},
get_languages: function(cont) { this.pgf_call("grammar",{},cont); },
grammar_info: function(cont) { this.pgf_call("grammar",{},cont); },
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) { // cat, limit
get_random: function(args,cont,err) { // cat, limit
args.random=Math.random(); // side effect!!
this.pgf_call("random",args,cont);
this.pgf_call("random",args,cont,err);
},
linearize: function(args,cont) { // tree, to
this.pgf_call("linearize",args,cont);
linearize: function(args,cont,err) { // tree, to
this.pgf_call("linearize",args,cont,err);
},
complete: function(args,cont) { // from, input, cat, limit
this.pgf_call("complete",args,cont);
complete: function(args,cont,err) { // from, input, cat, limit
this.pgf_call("complete",args,cont,err);
},
parse: function(args,cont) { // from, input, cat
this.pgf_call("parse",args,cont);
parse: function(args,cont,err) { // from, input, cat
this.pgf_call("parse",args,cont,err);
},
translate: function(args,cont) { // from, input, cat, to
this.pgf_call("translate",args,cont);
translate: function(args,cont,err) { // from, input, cat, to
this.pgf_call("translate",args,cont,err);
},
translategroup: function(args,cont) { // from, input, cat, to
this.pgf_call("translategroup",args,cont);
translategroup: function(args,cont,err) { // from, input, cat, to
this.pgf_call("translategroup",args,cont,err);
},
browse: function(id,cont,err) {
this.pgf_call("browse",{id:id,format:"json"},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;
}
}