matchfuncs.go

package jsonstream

/*
Copyright (c) 2021, Dell Inc  Michael Brown
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

* Redistributions of source code must retain the above copyright notice, this
  list of conditions and the following disclaimer.

* Redistributions in binary form must reproduce the above copyright notice,
  this list of conditions and the following disclaimer in the documentation
  and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

import (
	"bytes"
	"fmt"
)

func MatchPathPrefix(tokPath JSONPath, prefix JSONPath) JSONPath {
	if len(prefix) > len(tokPath) {
		return nil
	}
	for i := range prefix {
		switch t := prefix[i].(type) {
		case int:
			u, isInt := tokPath[i].(int)
			if !isInt || t != u {
				return nil
			}
		case []byte:
			u, isByteArr := tokPath[i].([]byte)
			if !isByteArr || !bytes.Equal(t, u) {
				return nil
			}
		default:
			panic(fmt.Sprintf("json path has wrong type member: %[1]T -> %[1]v", prefix[i]))
		}
	}
	return prefix
}

func MatchFuncPropertyPathPrefix(prefix JSONPath) func(p JSONPath) JSONPath {
	return func(tokPath JSONPath) JSONPath {
		return MatchPathPrefix(tokPath, prefix)
	}
}

func MatchFuncPropertyPathEqual(prefix JSONPath) func(p JSONPath) JSONPath {
	return func(tokPath JSONPath) JSONPath {
		if ret := MatchPathPrefix(tokPath, prefix); len(ret) == len(tokPath) {
			return ret
		}
		return nil
	}
}

func MatchFuncPropertyPartFunc(matchFunc func([]byte) bool) func(p JSONPath) JSONPath {
	return func(p JSONPath) JSONPath {
		for i := range p {
			prop, isObj := p[i].([]byte)
			if isObj && matchFunc(prop) {
				return p[:i+1]
			}
		}
		return nil
	}
}