169 lines
3.4 KiB
Go
169 lines
3.4 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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for {
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var tok Token
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var lit string
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one := &DataExpression{}
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// The first part of a SET expression must
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// always be an identifier, specifying a
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// record field to set.
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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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// The next query part must be a =, +=, or
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// -= operator, as this is a SET expression
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// and not a binary expression.
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one.Op, 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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// The next query part can be any expression
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// including a parenthesised expression or a
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// binary expression so handle accordingly.
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one.RHS, err = p.parseExpr()
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if err != nil {
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return nil, err
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}
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// Append the single SET data expression to
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// the array of data expressions.
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mul = append(mul, one)
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// Check to see if the next token is a comma
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// and if not, then break out of the loop,
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// otherwise repeat until we find no comma.
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if _, _, exi := p.mightBe(COMMA); !exi {
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break
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}
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}
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return
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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(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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one.JSON, 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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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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one.JSON, 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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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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one.JSON, 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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exp = append(exp, one)
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return
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}
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