/
parse.go
79 lines (71 loc) · 1.88 KB
/
parse.go
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// Copyright 2019 dfuse Platform Inc.
//
// 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 querylang
import (
"sort"
"github.com/alecthomas/participle"
)
var parser = participle.MustBuild(
&AST{},
participle.Lexer(queryLexer),
participle.Unquote("QuotedString"),
)
func Parse(input string) (expr *AST, err error) {
expr = &AST{}
err = parser.ParseString(input, expr)
if err == nil {
sortAST(expr)
}
return
}
func subgroupName(f *SubGroup) string {
if f.AndField == nil {
if len(f.OrFields) == 0 {
return ""
}
return f.OrFields[0].Name
}
return f.AndField.Name
}
func subgroupValue(f *SubGroup) string {
if f.AndField == nil {
if len(f.OrFields) == 0 {
return ""
}
return f.OrFields[0].StringValue()
}
return f.AndField.StringValue()
}
func sortAST(a *AST) {
for _, ae := range a.AndExpr {
if len(ae.OrFields) <= 1 {
continue
}
sort.SliceStable(ae.OrFields, func(i, j int) bool {
if ae.OrFields[i].Name == ae.OrFields[j].Name {
return ae.OrFields[i].StringValue() < ae.OrFields[j].StringValue()
}
return ae.OrFields[i].Name < ae.OrFields[j].Name
})
}
if len(a.AndExpr) <= 1 {
return
}
sort.SliceStable(a.AndExpr, func(i, j int) bool {
if subgroupName(a.AndExpr[i]) == subgroupName(a.AndExpr[j]) {
return subgroupValue(a.AndExpr[i]) < subgroupValue(a.AndExpr[j])
}
return subgroupName(a.AndExpr[i]) < subgroupName(a.AndExpr[j])
})
}