139 lines
2.6 KiB
Go
139 lines
2.6 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) parseTable() (*Table, error) {
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_, lit, err := p.shouldBe(IDENT)
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if err != nil {
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return nil, &ParseError{Found: lit, Expected: []string{"table name"}}
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}
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return &Table{Name: lit}, nil
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}
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func (p *Parser) parseIdent() (*IdentLiteral, error) {
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_, lit, err := p.shouldBe(IDENT)
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if err != nil {
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return nil, &ParseError{Found: lit, Expected: []string{"name"}}
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}
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return &IdentLiteral{Val: lit}, nil
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}
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func (p *Parser) parseString() (*StringLiteral, error) {
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_, lit, err := p.shouldBe(STRING)
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if err != nil {
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return nil, &ParseError{Found: lit, Expected: []string{"string"}}
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}
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return &StringLiteral{Val: lit}, nil
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}
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func (p *Parser) parseRegion() (*StringLiteral, error) {
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_, lit, err := p.shouldBe(IDENT, STRING, REGION)
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if err != nil {
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return nil, &ParseError{Found: lit, Expected: []string{"string"}}
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}
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return &StringLiteral{Val: lit}, nil
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}
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func (p *Parser) parseFields() ([]*Field, error) {
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var m []*Field
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for {
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s, err := p.parseField()
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if err != nil {
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return nil, err
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}
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m = append(m, s)
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// If the next token is not a comma then break the loop.
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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 m, nil
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}
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func (p *Parser) parseField() (*Field, error) {
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f := &Field{}
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expr, 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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f.Expr = expr
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switch expr.(type) {
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case *Wildcard:
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return f, nil
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}
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alias, err := p.parseAlias()
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if err != nil {
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return nil, err
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}
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f.Alias = alias
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return f, nil
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}
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func (p *Parser) parseExpr() (ex Expr, er error) {
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tok, lit, err := p.shouldBe(IDENT, NULL, ALL, TIME, TRUE, FALSE, STRING, REGION, NUMBER, DOUBLE, JSON)
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if err != nil {
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er = &ParseError{Found: lit, Expected: []string{"field name"}}
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}
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ex = declare(tok, lit)
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return
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}
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func (p *Parser) parseAlias() (ex Expr, er error) {
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if _, _, exi := p.mightBe(AS); !exi {
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return nil, nil
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}
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tok, lit, err := p.shouldBe(IDENT)
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if err != nil {
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er = &ParseError{Found: lit, Expected: []string{"field name"}}
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}
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ex = declare(tok, lit)
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return
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}
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