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.
163 lines
3.1 KiB
Go
163 lines
3.1 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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func (p *parser) parseData() (exp []Expr, err error) {
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if tok, _, exi := p.mightBe(SET, DIFF, MERGE, CONTENT); exi {
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if p.is(tok, SET) {
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if exp, err = p.parseSet(); err != nil {
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return nil, err
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}
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}
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if p.is(tok, DIFF) {
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if exp, err = p.parseDiff(); err != nil {
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return nil, err
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}
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}
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if p.is(tok, MERGE) {
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if exp, err = p.parseMerge(); err != nil {
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return nil, err
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}
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}
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if p.is(tok, CONTENT) {
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if exp, err = p.parseContent(); err != nil {
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return nil, err
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}
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}
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}
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return
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}
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func (p *parser) parseSet() (mul []Expr, err error) {
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var tok Token
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var lit string
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for {
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one := &BinaryExpression{}
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tok, lit, err = p.shouldBe(IDENT)
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if err != nil {
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return nil, &ParseError{Found: lit, Expected: []string{"field name"}}
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}
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one.LHS, err = p.declare(tok, lit)
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if err != nil {
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return nil, err
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}
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tok, lit, err = p.shouldBe(EQ, INC, DEC)
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if err != nil {
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return nil, err
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}
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one.Op = tok
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tok, lit, err = p.shouldBe(IDENT, THING, NULL, VOID, NOW, DATE, TIME, TRUE, FALSE, STRING, REGION, NUMBER, DOUBLE, JSON, ARRAY, PARAM)
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if err != nil {
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return nil, &ParseError{Found: lit, Expected: []string{"field value"}}
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}
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one.RHS, err = p.declare(tok, lit)
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if err != nil {
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return nil, err
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}
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mul = append(mul, one)
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if _, _, exi := p.mightBe(COMMA); !exi {
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p.unscan()
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break
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}
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}
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return mul, nil
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}
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func (p *parser) parseDiff() (exp []Expr, err error) {
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one := &DiffExpression{}
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tok, lit, err := p.shouldBe(JSON, ARRAY, PARAM)
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if err != nil {
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return nil, &ParseError{Found: lit, Expected: []string{"json"}}
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}
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val, err := p.declare(tok, lit)
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if err != nil {
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return nil, &ParseError{Found: lit, Expected: []string{"json"}}
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}
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one.JSON = val
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exp = append(exp, one)
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return
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}
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func (p *parser) parseMerge() (exp []Expr, err error) {
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one := &MergeExpression{}
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tok, lit, err := p.shouldBe(JSON, PARAM)
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if err != nil {
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return nil, &ParseError{Found: lit, Expected: []string{"json"}}
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}
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val, err := p.declare(tok, lit)
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if err != nil {
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return nil, &ParseError{Found: lit, Expected: []string{"json"}}
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}
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one.JSON = val
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exp = append(exp, one)
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return
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}
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func (p *parser) parseContent() (exp []Expr, err error) {
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one := &ContentExpression{}
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tok, lit, err := p.shouldBe(JSON, PARAM)
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if err != nil {
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return nil, &ParseError{Found: lit, Expected: []string{"json"}}
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}
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val, err := p.declare(tok, lit)
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if err != nil {
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return nil, &ParseError{Found: lit, Expected: []string{"json"}}
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}
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one.JSON = val
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exp = append(exp, one)
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return
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}
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