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Viewing file:     trace.js (1.81 KB)      -rwxrwxr-x

function getTrace(node) {
    function shouldPutToTrace(syntax) {
        if (syntax === null) {
            return false;
        }

        return (
            syntax.type === 'Type' ||
            syntax.type === 'Property' ||
            syntax.type === 'Keyword'
        );
    }

    function hasMatch(matchNode) {
        if (Array.isArray(matchNode.match)) {
            // use for-loop for better perfomance
            for (var i = 0; i < matchNode.match.length; i++) {
                if (hasMatch(matchNode.match[i])) {
                    if (shouldPutToTrace(matchNode.syntax)) {
                        result.unshift(matchNode.syntax);
                    }

                    return true;
                }
            }
        } else if (matchNode.node === node) {
            result = shouldPutToTrace(matchNode.syntax)
                ? [matchNode.syntax]
                : [];

            return true;
        }

        return false;
    }

    var result = null;

    if (this.matched !== null) {
        hasMatch(this.matched);
    }

    return result;
}

function testNode(match, node, fn) {
    var trace = getTrace.call(match, node);

    if (trace === null) {
        return false;
    }

    return trace.some(fn);
}

function isType(node, type) {
    return testNode(this, node, function(matchNode) {
        return matchNode.type === 'Type' && matchNode.name === type;
    });
}

function isProperty(node, property) {
    return testNode(this, node, function(matchNode) {
        return matchNode.type === 'Property' && matchNode.name === property;
    });
}

function isKeyword(node) {
    return testNode(this, node, function(matchNode) {
        return matchNode.type === 'Keyword';
    });
}

module.exports = {
    getTrace: getTrace,
    isType: isType,
    isProperty: isProperty,
    isKeyword: isKeyword
};