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// Copyright (C) MongoDB, Inc. 2014-present.
//
// 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
package json
import (
"fmt"
"reflect"
)
// Transition functions for recognizing Boolean.
// Adapted from encoding/json/scanner.go.
// stateBo is the state after reading `Bo`.
func stateBo(s *scanner, c int) int {
if c == 'o' {
s.step = generateState("Boolean", []byte("lean"), stateConstructor)
return scanContinue
}
return s.error(c, "in literal Boolean (expecting 'o')")
}
// Decodes a Boolean literal stored in the underlying byte data into v.
func (d *decodeState) storeBoolean(v reflect.Value) {
res := d.getBoolean()
switch kind := v.Kind(); kind {
case reflect.Interface, reflect.Bool:
v.Set(reflect.ValueOf(res))
default:
d.error(fmt.Errorf("cannot store bool value into %v type", kind))
}
}
// Returns a Boolean literal from the underlying byte data.
func (d *decodeState) getBoolean() interface{} {
op := d.scanWhile(scanSkipSpace)
if op != scanBeginCtor {
d.error(fmt.Errorf("expected beginning of constructor"))
}
// Prevent d.convertNumber() from parsing the argument as a float64.
useNumber := d.useNumber
d.useNumber = true
args := d.ctorInterface()
if len(args) == 0 {
return false
}
// Ignore all but the first argument.
switch v := args[0].(type) {
case bool:
return v
case Number:
d.useNumber = useNumber
// First try Int64 so hex numbers work, then if that fails try Float64.
num, err := v.Int64()
if err == nil {
return (num != 0)
}
numF, err := v.Float64()
if err != nil {
d.error(fmt.Errorf("expected float64 for numeric argument of Boolean constructor, got err: %v", err))
}
return (numF != 0)
case string:
return (v != "")
case Undefined, nil:
return false
// Parameter values of any other types should yield true.
default:
return true
}
}
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