140 lines
2.6 KiB
Go
140 lines
2.6 KiB
Go
|
// Copyright © 2016 Abcum Ltd
|
||
|
|
//
|
||
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
||
|
|
// you may not use this file except in compliance with the License.
|
||
|
|
// You may obtain a copy of the License at
|
||
|
|
//
|
||
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
||
|
|
//
|
||
|
|
// Unless required by applicable law or agreed to in writing, software
|
||
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
||
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||
|
|
// See the License for the specific language governing permissions and
|
||
|
|
// limitations under the License.
|
||
|
|
|
||
|
|
package sql
|
||
|
|
|
||
|
|
func (p *Parser) parseTable() (*Table, error) {
|
||
|
|
|
||
|
|
_, lit, err := p.shouldBe(IDENT)
|
||
|
|
if err != nil {
|
||
|
|
return nil, &ParseError{Found: lit, Expected: []string{"table name"}}
|
||
|
|
}
|
||
|
|
|
||
|
|
return &Table{Name: lit}, nil
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
func (p *Parser) parseIdent() (*IdentLiteral, error) {
|
||
|
|
|
||
|
|
_, lit, err := p.shouldBe(IDENT)
|
||
|
|
if err != nil {
|
||
|
|
return nil, &ParseError{Found: lit, Expected: []string{"name"}}
|
||
|
|
}
|
||
|
|
|
||
|
|
return &IdentLiteral{Val: lit}, nil
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
func (p *Parser) parseString() (*StringLiteral, error) {
|
||
|
|
|
||
|
|
_, lit, err := p.shouldBe(STRING)
|
||
|
|
if err != nil {
|
||
|
|
return nil, &ParseError{Found: lit, Expected: []string{"string"}}
|
||
|
|
}
|
||
|
|
|
||
|
|
return &StringLiteral{Val: lit}, nil
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
func (p *Parser) parseRegion() (*StringLiteral, error) {
|
||
|
|
|
||
|
|
_, lit, err := p.shouldBe(IDENT, STRING, REGION)
|
||
|
|
if err != nil {
|
||
|
|
return nil, &ParseError{Found: lit, Expected: []string{"string"}}
|
||
|
|
}
|
||
|
|
|
||
|
|
return &StringLiteral{Val: lit}, nil
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
func (p *Parser) parseFields() ([]*Field, error) {
|
||
|
|
|
||
|
|
var m []*Field
|
||
|
|
|
||
|
|
for {
|
||
|
|
|
||
|
|
s, err := p.parseField()
|
||
|
|
|
||
|
|
if err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
|
||
|
|
m = append(m, s)
|
||
|
|
|
||
|
|
// If the next token is not a comma then break the loop.
|
||
|
|
if _, _, exi := p.mightBe(COMMA); !exi {
|
||
|
|
break
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
return m, nil
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
func (p *Parser) parseField() (*Field, error) {
|
||
|
|
|
||
|
|
f := &Field{}
|
||
|
|
|
||
|
|
expr, err := p.parseExpr()
|
||
|
|
if err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
f.Expr = expr
|
||
|
|
|
||
|
|
switch expr.(type) {
|
||
|
|
case *Wildcard:
|
||
|
|
return f, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
alias, err := p.parseAlias()
|
||
|
|
if err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
f.Alias = alias
|
||
|
|
|
||
|
|
return f, nil
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
func (p *Parser) parseExpr() (ex Expr, er error) {
|
||
|
|
|
||
|
|
tok, lit, err := p.shouldBe(IDENT, NULL, ALL, TIME, TRUE, FALSE, STRING, REGION, NUMBER, DOUBLE, JSON)
|
||
|
|
if err != nil {
|
||
|
|
er = &ParseError{Found: lit, Expected: []string{"field name"}}
|
||
|
|
}
|
||
|
|
|
||
|
|
ex = declare(tok, lit)
|
||
|
|
|
||
|
|
return
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
func (p *Parser) parseAlias() (ex Expr, er error) {
|
||
|
|
|
||
|
|
if _, _, exi := p.mightBe(AS); !exi {
|
||
|
|
return nil, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
tok, lit, err := p.shouldBe(IDENT)
|
||
|
|
if err != nil {
|
||
|
|
er = &ParseError{Found: lit, Expected: []string{"field name"}}
|
||
|
|
}
|
||
|
|
|
||
|
|
ex = declare(tok, lit)
|
||
|
|
|
||
|
|
return
|
||
|
|
|
||
|
|
}
|