mirror of
https://github.com/featurebasedb/featurebase.git
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64 lines
1.5 KiB
Go
64 lines
1.5 KiB
Go
// Copyright 2017 Pilosa Corp.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package pql
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import (
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"io"
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"io/ioutil"
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"strings"
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"github.com/pkg/errors"
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)
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// timeFormat is the go-style time format used to parse string dates.
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const timeFormat = "2006-01-02T15:04"
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// parser represents a parser for the PQL language.
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type parser struct {
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r io.Reader
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//scanner *bufScanner
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PQL
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}
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// NewParser returns a new instance of Parser.
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func NewParser(r io.Reader) *parser {
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return &parser{
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r: r,
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// scanner: newBufScanner(r),
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}
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}
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// ParseString parses s into a query.
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func ParseString(s string) (*Query, error) {
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return NewParser(strings.NewReader(s)).Parse()
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}
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// Parse parses the next node in the query.
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func (p *parser) Parse() (*Query, error) {
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buf, err := ioutil.ReadAll(p.r)
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if err != nil {
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return nil, errors.Wrap(err, "reading buffer to parse")
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}
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p.PQL = PQL{
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Buffer: string(buf),
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}
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p.Init()
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err = p.PQL.Parse()
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if err != nil {
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return nil, errors.Wrap(err, "parsing")
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}
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p.Execute()
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return &p.Query, nil
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}
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