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Add esquery.traverse #45

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Add esquery.traverse #45

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28 changes: 21 additions & 7 deletions esquery.js
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Original file line number Diff line number Diff line change
Expand Up @@ -245,32 +245,45 @@
}

/**
* From a JS AST and a selector AST, collect all JS AST nodes that match the selector.
* From a JS AST and a selector AST, visit all JS AST nodes that match the selector.
*/
function match(ast, selector) {
var ancestry = [], results = [], altSubjects, i, l, k, m;
if (!selector) { return results; }
function traverse(ast, selector, visitor) {
var ancestry = [], altSubjects, i, l, k, m;
if (!selector) { return }
altSubjects = subjects(selector);
estraverse.traverse(ast, {
enter: function (node, parent) {
if (parent != null) { ancestry.unshift(parent); }
if (matches(node, selector, ancestry)) {
if (altSubjects.length) {
for (i = 0, l = altSubjects.length; i < l; ++i) {
if (matches(node, altSubjects[i], ancestry)) { results.push(node); }
if (matches(node, altSubjects[i], ancestry)) {
visitor(node, parent, ancestry.slice());
}
for (k = 0, m = ancestry.length; k < m; ++k) {
if (matches(ancestry[k], altSubjects[i], ancestry.slice(k + 1))) {
results.push(ancestry[k]);
visitor(ancestry[k], parent, ancestry.slice());
}
}
}
} else {
results.push(node);
visitor(node, parent, ancestry.slice());
}
}
},
leave: function () { ancestry.shift(); }
});
}

/**
* From a JS AST and a selector AST, collect all JS AST nodes that match the selector.
*/
function match(ast, selector) {
var results = [];
if (!selector) { return results; }
traverse(ast, selector, function(node, parent, ancestry){
results.push(node);
})
return results;
}

Expand All @@ -290,6 +303,7 @@

query.parse = parse;
query.match = match;
query.traverse = traverse;
query.matches = matches;
return query.query = query;
}
Expand Down