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- # AST nodes have this structure:
- # {"type": <node type>", children: [], "value": ""}
-
-
- def comparator(name, first, second):
- return {'type': 'comparator', 'children': [first, second], 'value': name}
-
-
- def current_node():
- return {'type': 'current', 'children': []}
-
-
- def expref(expression):
- return {'type': 'expref', 'children': [expression]}
-
-
- def function_expression(name, args):
- return {'type': 'function_expression', 'children': args, 'value': name}
-
-
- def field(name):
- return {"type": "field", "children": [], "value": name}
-
-
- def filter_projection(left, right, comparator):
- return {'type': 'filter_projection', 'children': [left, right, comparator]}
-
-
- def flatten(node):
- return {'type': 'flatten', 'children': [node]}
-
-
- def identity():
- return {"type": "identity", 'children': []}
-
-
- def index(index):
- return {"type": "index", "value": index, "children": []}
-
-
- def index_expression(children):
- return {"type": "index_expression", 'children': children}
-
-
- def key_val_pair(key_name, node):
- return {"type": "key_val_pair", 'children': [node], "value": key_name}
-
-
- def literal(literal_value):
- return {'type': 'literal', 'value': literal_value, 'children': []}
-
-
- def multi_select_dict(nodes):
- return {"type": "multi_select_dict", "children": nodes}
-
-
- def multi_select_list(nodes):
- return {"type": "multi_select_list", "children": nodes}
-
-
- def or_expression(left, right):
- return {"type": "or_expression", "children": [left, right]}
-
-
- def and_expression(left, right):
- return {"type": "and_expression", "children": [left, right]}
-
-
- def not_expression(expr):
- return {"type": "not_expression", "children": [expr]}
-
-
- def pipe(left, right):
- return {'type': 'pipe', 'children': [left, right]}
-
-
- def projection(left, right):
- return {'type': 'projection', 'children': [left, right]}
-
-
- def subexpression(children):
- return {"type": "subexpression", 'children': children}
-
-
- def slice(start, end, step):
- return {"type": "slice", "children": [start, end, step]}
-
-
- def value_projection(left, right):
- return {'type': 'value_projection', 'children': [left, right]}
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