git.iko.soy/elk
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elk/libraries/Native/Error.js
32 lines 1.1 kB history raw
2Elm.Native.Error = function(elm) {
3 'use strict';
4 elm.Native = elm.Native || {};
5 if (elm.Native.Error) return elm.Native.Error;
7 var fromString = Elm.Native.JavaScript(elm).fromString;
9 function indent(lines) {
10 var msg = '';
11 for (var i = 0; i < lines.length; ++i) {
12 msg += '<br/>&nbsp; &nbsp; ' + lines[i];
13 }
14 return msg;
15 }
17 function Case(moduleName, span) {
18 var msg = indent(['Non-exhaustive pattern match in case-expression.',
19 'Make sure your patterns cover every case!']);
20 throw new Error('Runtime error in module ' + moduleName + ' (' + span + '):' + msg);
21 }
23 function If(moduleName, span) {
24 var msg = indent(['Non-exhaustive pattern match in multi-way-if expression.',
25 'It is best to use \'otherwise\' as the last branch of multi-way-if.']);
26 throw new Error('Runtime error in module ' + moduleName + ' (' + span + '):' + msg);
27 }
29 function raise(str) { throw new Error(fromString(str)); }
31 return elm.Native.Error = { Case: Case, If: If, raise: raise };
32};