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145 lines
5.8 KiB
145 lines
5.8 KiB
from engine.ast import ColRef, TableInfo, ast_node, Context, include
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from engine.groupby import groupby
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from engine.join import join
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from engine.expr import expr
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from engine.orderby import orderby
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from engine.scan import filter
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from engine.utils import base62uuid, enlist, base62alp
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from engine.ddl import create_table, outfile
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import copy
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class projection(ast_node):
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name='select'
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def __init__(self, parent:ast_node, node, context:Context = None, outname = None, disp = True):
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self.disp = disp
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self.outname = outname
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self.group_node = None
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self.assumption = None
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self.where = None
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ast_node.__init__(self, parent, node, context)
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def init(self, _):
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if self.outname is None:
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self.outname = self.context.gen_tmptable()
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def produce(self, node):
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p = node['select']
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self.projections = p if type(p) is list else [p]
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print(node)
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def spawn(self, node):
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self.datasource = None
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if 'from' in node:
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from_clause = node['from']
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if type(from_clause) is list:
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# from joins
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join(self, from_clause)
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elif type(from_clause) is dict:
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if 'value' in from_clause:
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value = from_clause['value']
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if type(value) is dict:
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if 'select' in value:
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# from subquery
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projection(self, from_clause, disp = False)
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else:
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# TODO: from func over table
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print(f'from func over table{node}')
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elif type(value) is str:
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self.datasource = self.context.tables_byname[value]
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if 'assumptions' in from_clause:
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self.assumption = orderby(self, enlist(from_clause['assumptions']))
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elif type(from_clause) is str:
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self.datasource = self.context.tables_byname[from_clause]
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if self.datasource is None:
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raise ValueError('spawn error: from clause')
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if self.datasource is not None:
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self.datasource_changed = True
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self.prev_datasource = self.context.datasource
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self.context.datasource = self.datasource
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if 'where' in node:
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self.where = filter(self, node['where'], True)
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# self.datasource = filter(self, node['where'], True).output
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#self.context.datasource = self.datasource
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if 'groupby' in node:
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self.group_node = groupby(self, node['groupby'])
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self.datasource = copy.copy(self.datasource) # shallow copy
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self.datasource.groupinfo = self.group_node
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else:
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self.group_node = None
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def consume(self, node):
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self.inv = True
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disp_varname = 'd'+base62uuid(7)
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has_groupby = False
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if self.group_node is not None:
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# There is group by;
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has_groupby = True
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cexprs = []
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flatten = False
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cols = []
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self.out_table = TableInfo('out_'+base62uuid(4), [], self.context)
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if 'outfile' in node:
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flatten = True
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new_names = []
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for i, proj in enumerate(self.projections):
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cname = ''
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compound = False
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self.datasource.rec = set()
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if type(proj) is dict:
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if 'value' in proj:
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e = proj['value']
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sname = expr(self, e)._expr
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fname = expr.toCExpr(sname) # fastest access method at innermost context
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absname = expr(self, e, abs_col=True)._expr # absolute name at function scope
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compound = True
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cexprs.append(fname)
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cname = e if type(e) is str else ''.join([a if a in base62alp else '' for a in expr.toCExpr(absname)()])
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if 'name' in proj: # renaming column by AS keyword
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cname = proj['name']
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new_names.append(cname)
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elif type(proj) is str:
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col = self.datasource.get_col_d(proj)
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if type(col) is ColRef:
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col.reference()
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compound = compound and has_groupby and self.datasource.rec not in self.group_node.referenced
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self.datasource.rec = None
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cols.append(ColRef(cname, expr.toCExpr(f'decays<decltype({absname})>')(0), self.out_table, 0, None, cname, i, compound=compound))
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self.out_table.add_cols(cols, False)
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if has_groupby:
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create_table(self, self.out_table)
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self.group_node.finalize(cexprs, self.out_table)
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else:
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create_table(self, self.out_table, cexpr = cexprs)
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self.datasource.group_node = None
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if self.where is not None:
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self.where.finalize()
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has_orderby = 'orderby' in node
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if has_orderby:
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self.datasource = self.out_table
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self.context.datasource = self.out_table # discard current ds
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orderby_node = orderby(self, node['orderby'])
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self.emit(f'auto {disp_varname} ={self.out_table.reference()}->order_by_view<{",".join([f"{c}" for c in orderby_node.col_list])}>();')
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else:
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disp_varname = f'*{self.out_table.cxt_name}'
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if self.disp:
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self.emit(f'print({disp_varname});')
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if flatten:
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if len(self.projections) > 1 and not self.inv:
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self.emit(f"{disp_varname}:+{disp_varname}")
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outfile(self, node['outfile'])
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if self.datasource_changed:
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self.context.datasource = self.prev_datasource
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import sys
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include(sys.modules[__name__]) |