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58 lines
1.8 KiB
58 lines
1.8 KiB
from engine.ast import ColRef, TableInfo, View, ast_node, Context
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from engine.utils import base62uuid, seps
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from engine.expr import expr
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class order_item:
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def __init__(self, name, node, order = True):
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self.name = name
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self.order = order
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self.node = node
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self.materialized = False
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def materialize(self):
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if not self.materialized:
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self.name = expr(self.node, self.name, False).cexpr
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self.materialized = True
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return ('' if self.order else '-') + f'({self.name})'
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def __str__(self):
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return self.materialize()
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def __repr__(self):
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return self.__str__()
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class orders:
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def __init__(self, node, datasource):
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self.order_items = []
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self.materialized = False
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self.view = None
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self.node = node
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self.datasource = datasource
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self.n_attrs = -1
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def materialize(self):
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if not self.materialized:
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self.view = View(self.node.context, self.datasource, False)
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keys = ';'.join([f'{o}' for o in self.order_items])
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self.n_attrs = len(self.order_items)
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self.node.emit(f"{self.view.name}: > +`j (({',' if self.n_attrs == 1 else ''}{keys}))")
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self.materialized = True
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def append(self, o):
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self.order_items.append(o)
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class orderby(ast_node):
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name = '_orderby'
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def init(self, _):
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self.datasource = self.parent.datasource
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self.order = orders(self, self.datasource)
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self.view = ''
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def produce(self, node):
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if type(node) is not list:
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node = [node]
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for n in node:
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order = not ('sort' in n and n['sort'] == 'desc')
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self.order.append(order_item(n['value'], self, order))
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def consume(self, _):
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self.datasource.order.append(self.order) |