151d73b954
MODIFY SQL statements have now been merged with UPDATE SQL statements, as the functionality was similar, but the code was duplicated. The DIFF SQL command has been added to the UPDATE query, so that records can be updated with DIFFs.
431 lines
7.2 KiB
Go
431 lines
7.2 KiB
Go
// Copyright © 2016 Abcum Ltd
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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 sql
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// Token defines a lexical token
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type Token int
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const (
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// special
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ILLEGAL Token = iota
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EOF
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WS
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// literals
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literalsBeg
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DATE // 1970-01-01
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TIME // 1970-01-01T00:00:00+00:00
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PATH // person->like->person
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JSON // {"test":true}
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IDENT // something
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THING // @class:id
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STRING // "something"
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REGION // "a multiline \n string"
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NUMBER // 123456
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DOUBLE // 123.456
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REGEX // /.*/
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ARRAY // [0,1,2]
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DURATION // 13h
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PARAM // $1
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DOT // .
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COMMA // ,
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QMARK // ?
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LPAREN // (
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RPAREN // )
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LBRACK // [
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RBRACK // ]
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COLON // :
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SEMICOLON // ;
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literalsEnd
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// operators
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operatorBeg
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ADD // +
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SUB // -
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MUL // *
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DIV // /
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INC // +=
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DEC // -=
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EQ // =
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EEQ // ==
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EXC // !
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NEQ // !=
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NEE // !==
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ANY // ?=
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LT // <
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LTE // <=
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GT // >
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GTE // >=
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SIN // ∋
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SNI // ∌
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INS // ∈
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NIS // ∉
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OEDGE // ->
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IEDGE // <-
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BEDGE // <->
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operatorEnd
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// literals
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keywordsBeg
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ACCEPT
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AFTER
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ALL
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ALLCONTAINEDIN
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AND
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AS
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ASC
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AT
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BEFORE
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BEGIN
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BOTH
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BY
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CANCEL
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CODE
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COLUMNS
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COMMIT
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CONTAINS
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CONTAINSALL
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CONTAINSNONE
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CONTAINSSOME
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CONTENT
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CREATE
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CUSTOM
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DATABASE
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DEFAULT
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DEFINE
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DELETE
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DESC
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DIFF
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DISTINCT
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EMPTY
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ENUM
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EXPUNGE
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FALSE
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FIELD
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FOR
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FROM
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GROUP
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HISTORY
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ID
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IF
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IN
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INDEX
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INFO
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INSERT
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INTO
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IS
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LET
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LIMIT
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LIVE
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MANDATORY
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MATCH
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MAX
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MERGE
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MIN
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MISSING
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MULTI
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NAMESPACE
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NONE
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NONECONTAINEDIN
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NOT
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NOTNULL
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NOW
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NULL
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OFFSET
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ON
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OR
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ORDER
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POLICY
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READONLY
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REJECT
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RELATE
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REMOVE
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RETURN
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ROLLBACK
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RULES
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SCHEMAFULL
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SCHEMALESS
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SCOPE
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SELECT
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SESSION
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SET
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SIGNIN
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SIGNUP
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SOMECONTAINEDIN
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START
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TABLE
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TO
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TRANSACTION
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TRUE
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TYPE
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UNIQUE
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UPDATE
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UPSERT
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USE
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VALIDATE
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VERSION
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VIEW
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VOID
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WHERE
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keywordsEnd
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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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// literals
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DATE: "DATE",
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TIME: "TIME",
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PATH: "PATH",
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JSON: "JSON",
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IDENT: "IDENT",
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THING: "THING",
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STRING: "STRING",
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REGION: "REGION",
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NUMBER: "NUMBER",
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DOUBLE: "DOUBLE",
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REGEX: "REGEX",
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ARRAY: "ARRAY",
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DURATION: "DURATION",
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PARAM: "PARAM",
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DOT: ".",
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COMMA: ",",
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QMARK: "?",
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LPAREN: "(",
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RPAREN: ")",
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LBRACK: "[",
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RBRACK: "]",
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COLON: ":",
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SEMICOLON: ";",
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// operators
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ADD: "+",
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SUB: "-",
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MUL: "*",
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DIV: "/",
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INC: "+=",
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DEC: "-=",
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EQ: "=",
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EEQ: "==",
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EXC: "!",
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NEQ: "!=",
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NEE: "!==",
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ANY: "?=",
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LT: "<",
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LTE: "<=",
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GT: ">",
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GTE: ">=",
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SIN: "∋",
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SNI: "∌",
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INS: "∈",
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NIS: "∉",
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OEDGE: "->",
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IEDGE: "<-",
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BEDGE: "<->",
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// keywords
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ACCEPT: "ACCEPT",
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AFTER: "AFTER",
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ALL: "ALL",
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ALLCONTAINEDIN: "ALLCONTAINEDIN",
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AND: "AND",
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AS: "AS",
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ASC: "ASC",
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AT: "AT",
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BEFORE: "BEFORE",
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BEGIN: "BEGIN",
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BOTH: "BOTH",
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BY: "BY",
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CANCEL: "CANCEL",
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CODE: "CODE",
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COLUMNS: "COLUMNS",
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COMMIT: "COMMIT",
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CONTAINS: "CONTAINS",
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CONTAINSALL: "CONTAINSALL",
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CONTAINSNONE: "CONTAINSNONE",
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CONTAINSSOME: "CONTAINSSOME",
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CONTENT: "CONTENT",
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CREATE: "CREATE",
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CUSTOM: "CUSTOM",
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DATABASE: "DATABASE",
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DEFAULT: "DEFAULT",
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DEFINE: "DEFINE",
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DELETE: "DELETE",
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DESC: "DESC",
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DIFF: "DIFF",
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DISTINCT: "DISTINCT",
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EMPTY: "EMPTY",
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ENUM: "ENUM",
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EXPUNGE: "EXPUNGE",
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FALSE: "FALSE",
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FIELD: "FIELD",
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FOR: "FOR",
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FROM: "FROM",
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GROUP: "GROUP",
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HISTORY: "HISTORY",
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ID: "ID",
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IF: "IF",
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IN: "IN",
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INDEX: "INDEX",
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INFO: "INFO",
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INSERT: "INSERT",
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INTO: "INTO",
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IS: "IS",
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LET: "LET",
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LIMIT: "LIMIT",
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LIVE: "LIVE",
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MANDATORY: "MANDATORY",
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MATCH: "MATCH",
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MAX: "MAX",
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MERGE: "MERGE",
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MIN: "MIN",
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MISSING: "MISSING",
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MULTI: "MULTI",
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NAMESPACE: "NAMESPACE",
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NONE: "NONE",
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NONECONTAINEDIN: "NONECONTAINEDIN",
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NOT: "NOT",
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NOTNULL: "NOTNULL",
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NOW: "NOW",
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NULL: "NULL",
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ON: "ON",
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OR: "OR",
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ORDER: "ORDER",
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POLICY: "POLICY",
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READONLY: "READONLY",
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REJECT: "REJECT",
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RELATE: "RELATE",
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REMOVE: "REMOVE",
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RETURN: "RETURN",
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ROLLBACK: "ROLLBACK",
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RULES: "RULES",
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SCHEMAFULL: "SCHEMAFULL",
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SCHEMALESS: "SCHEMALESS",
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SCOPE: "SCOPE",
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SELECT: "SELECT",
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SESSION: "SESSION",
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SET: "SET",
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SIGNIN: "SIGNIN",
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SIGNUP: "SIGNUP",
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SOMECONTAINEDIN: "SOMECONTAINEDIN",
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START: "START",
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TABLE: "TABLE",
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TO: "TO",
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TRANSACTION: "TRANSACTION",
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TRUE: "TRUE",
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TYPE: "TYPE",
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UNIQUE: "UNIQUE",
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UPDATE: "UPDATE",
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UPSERT: "UPSERT",
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USE: "USE",
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VALIDATE: "VALIDATE",
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VERSION: "VERSION",
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VIEW: "VIEW",
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VOID: "VOID",
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WHERE: "WHERE",
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}
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var literals map[string]Token
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var operator map[string]Token
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var keywords map[string]Token
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func init() {
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literals = make(map[string]Token)
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for tok := literalsBeg + 1; tok < literalsEnd; tok++ {
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literals[tokens[tok]] = tok
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}
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operator = make(map[string]Token)
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for tok := operatorBeg + 1; tok < operatorEnd; tok++ {
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operator[tokens[tok]] = tok
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}
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keywords = make(map[string]Token)
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for tok := keywordsBeg + 1; tok < keywordsEnd; tok++ {
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keywords[tokens[tok]] = tok
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}
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}
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func lookup(lookups []Token) (literals []string) {
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for _, token := range lookups {
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literals = append(literals, token.String())
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}
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return
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}
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func (tok Token) precedence() int {
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switch tok {
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case OR:
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return 1
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case AND:
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return 2
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case EQ, NEQ, EEQ, NEE,
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LT, LTE, GT, GTE,
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ANY, SIN, SNI, INS, NIS,
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CONTAINSALL, CONTAINSNONE, CONTAINSSOME,
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ALLCONTAINEDIN, NONECONTAINEDIN, SOMECONTAINEDIN:
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return 3
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case ADD, SUB:
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return 4
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case MUL, DIV:
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return 5
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}
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return 0
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}
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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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func (tok Token) MarshalText() (data []byte, err error) {
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return []byte(tok.String()), err
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}
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func (tok Token) isLiteral() bool { return tok > literalsBeg && tok < literalsEnd }
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func (tok Token) isKeyword() bool { return tok > keywordsBeg && tok < keywordsEnd }
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func (tok Token) isOperator() bool { return tok > operatorBeg && tok < operatorEnd }
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