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https://github.com/featurebasedb/featurebase.git
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2b88d278bc
The PQL looks like: ``` Range(frame=f, field0 >< [200,610]) ``` One thing I noticed while implementing this is that it doesn't seem like `FieldRange()` is used in either `Frame` or `View`; the Executor calls `Fragment.FieldRange()` directly. The problem with this is that the offset logic is calculated in the Frame, but since the Executor doesn't go through Frame, then the Executor also has to calculate the offset before calling `Fragment.FieldRange`. We should unify this logic somewhere. Note, this applies to both `FieldRange` and `FieldRangeBetween`.
109 lines
2.1 KiB
Go
109 lines
2.1 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 "strings"
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// Token is a lexical token of the PQL language.
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type Token int
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const (
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// Special tokens
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ILLEGAL Token = iota
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EOF
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WS
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literal_beg
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IDENT // main
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STRING // "foo"
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BADSTRING // bad escape or unclosed string
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INTEGER // 12345
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FLOAT // 100.2
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literal_end
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keyword_beg
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ALL
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keyword_end
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ASSIGN // =
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EQ // ==
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LT // <
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LTE // <=
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GT // >
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GTE // >=
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BETWEEN // ><
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COMMA // ,
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LPAREN // (
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RPAREN // )
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LBRACK // (
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RBRACK // )
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)
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var tokens = [...]string{
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ILLEGAL: "ILLEGAL",
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EOF: "EOF",
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WS: "WS",
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IDENT: "IDENT",
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INTEGER: "INTEGER",
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FLOAT: "FLOAT",
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ALL: "ALL",
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ASSIGN: "=",
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EQ: "==",
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LT: "<",
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LTE: "<=",
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GT: ">",
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GTE: ">=",
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BETWEEN: "><",
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COMMA: ",",
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LPAREN: "(",
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RPAREN: ")",
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LBRACK: "(",
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RBRACK: ")",
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}
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var keywords map[string]Token
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func init() {
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keywords = make(map[string]Token)
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for tok := keyword_beg + 1; tok < keyword_end; tok++ {
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keywords[strings.ToLower(tokens[tok])] = tok
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}
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}
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// String returns the string representation of the token.
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func (tok Token) String() string {
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if tok >= 0 && tok < Token(len(tokens)) {
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return tokens[tok]
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}
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return ""
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}
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// Lookup returns the token associated with a given string.
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func Lookup(ident string) Token {
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if tok, ok := keywords[strings.ToLower(ident)]; ok {
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return tok
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}
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return IDENT
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}
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// Pos specifies the line and character position of a token.
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// The Char and Line are both zero-based indexes.
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type Pos struct {
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Line int
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Char int
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}
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