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function noop(value) {
return value;
}
function generateMultiplier(multiplier) {
if (multiplier.min === 0 && multiplier.max === 0) {
return '*';
}
if (multiplier.min === 0 && multiplier.max === 1) {
return '?';
}
if (multiplier.min === 1 && multiplier.max === 0) {
return multiplier.comma ? '#' : '+';
}
if (multiplier.min === 1 && multiplier.max === 1) {
return '';
}
return (
(multiplier.comma ? '#' : '') +
(multiplier.min === multiplier.max
? '{' + multiplier.min + '}'
: '{' + multiplier.min + ',' + (multiplier.max !== 0 ? multiplier.max : '') + '}'
)
);
}
function generateTypeOpts(node) {
switch (node.type) {
case 'Range':
return (
' [' +
(node.min === null ? '-∞' : node.min) +
',' +
(node.max === null ? '∞' : node.max) +
']'
);
default:
throw new Error('Unknown node type `' + node.type + '`');
}
}
function generateSequence(node, decorate, forceBraces, compact) {
var combinator = node.combinator === ' ' || compact ? node.combinator : ' ' + node.combinator + ' ';
var result = node.terms.map(function(term) {
return generate(term, decorate, forceBraces, compact);
}).join(combinator);
if (node.explicit || forceBraces) {
result = (compact || result[0] === ',' ? '[' : '[ ') + result + (compact ? ']' : ' ]');
}
return result;
}
function generate(node, decorate, forceBraces, compact) {
var result;
switch (node.type) {
case 'Group':
result =
generateSequence(node, decorate, forceBraces, compact) +
(node.disallowEmpty ? '!' : '');
break;
case 'Multiplier':
// return since node is a composition
return (
generate(node.term, decorate, forceBraces, compact) +
decorate(generateMultiplier(node), node)
);
case 'Type':
result = '<' + node.name + (node.opts ? decorate(generateTypeOpts(node.opts), node.opts) : '') + '>';
break;
case 'Property':
result = '<\'' + node.name + '\'>';
break;
case 'Keyword':
result = node.name;
break;
case 'AtKeyword':
result = '@' + node.name;
break;
case 'Function':
result = node.name + '(';
break;
case 'String':
case 'Token':
result = node.value;
break;
case 'Comma':
result = ',';
break;
default:
throw new Error('Unknown node type `' + node.type + '`');
}
return decorate(result, node);
}
module.exports = function(node, options) {
var decorate = noop;
var forceBraces = false;
var compact = false;
if (typeof options === 'function') {
decorate = options;
} else if (options) {
forceBraces = Boolean(options.forceBraces);
compact = Boolean(options.compact);
if (typeof options.decorate === 'function') {
decorate = options.decorate;
}
}
return generate(node, decorate, forceBraces, compact);
};