93 lines
2.2 KiB
Go
93 lines
2.2 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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func (p *Parser) parseCond() (mul []Expr, err error) {
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var tok Token
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var lit string
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// Remove the WHERE keyword
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if _, _, exi := p.mightBe(WHERE); !exi {
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return nil, nil
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}
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for {
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one := &BinaryExpression{}
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tok, lit, err = p.shouldBe(ID, IDENT, THING, NULL, VOID, MISSING, EMPTY, NOW, DATE, TIME, TRUE, FALSE, STRING, REGION, NUMBER, DOUBLE, REGEX, JSON, ARRAY, PARAM)
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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(IS, IN, EQ, NEQ, EEQ, NEE, ANY, LT, LTE, GT, GTE, SIN, SNI, INS, NIS, CONTAINS, CONTAINSALL, CONTAINSNONE, CONTAINSSOME, ALLCONTAINEDIN, NONECONTAINEDIN, SOMECONTAINEDIN)
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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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if tok == IN {
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one.Op = INS
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}
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if tok == IS {
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one.Op = EQ
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if _, _, exi := p.mightBe(NOT); exi {
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one.Op = NEQ
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}
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if _, _, exi := p.mightBe(IN); exi {
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switch one.Op {
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case EQ:
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one.Op = INS
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case NEQ:
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one.Op = NIS
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}
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}
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}
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if tok == CONTAINS {
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one.Op = SIN
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if _, _, exi := p.mightBe(NOT); exi {
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one.Op = SNI
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}
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}
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tok, lit, err = p.shouldBe(ID, IDENT, THING, NULL, VOID, MISSING, EMPTY, NOW, DATE, TIME, TRUE, FALSE, STRING, REGION, NUMBER, DOUBLE, REGEX, 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(AND, OR); !exi {
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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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