127 lines
2.9 KiB
Go
127 lines
2.9 KiB
Go
package fastjson
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import (
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"strconv"
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)
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// Arena may be used for fast creation and re-use of Values.
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//
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// Typical Arena lifecycle:
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//
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// 1) Construct Values via the Arena and Value.Set* calls.
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// 2) Marshal the constructed Values with Value.MarshalTo call.
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// 3) Reset all the constructed Values at once by Arena.Reset call.
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// 4) Go to 1 and re-use the Arena.
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//
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// It is unsafe calling Arena methods from concurrent goroutines.
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// Use per-goroutine Arenas or ArenaPool instead.
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type Arena struct {
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b []byte
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c cache
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}
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// Reset resets all the Values allocated by a.
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//
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// Values previously allocated by a cannot be used after the Reset call.
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func (a *Arena) Reset() {
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a.b = a.b[:0]
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a.c.reset()
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}
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// NewObject returns new empty object value.
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//
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// New entries may be added to the returned object via Set call.
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//
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// The returned object is valid until Reset is called on a.
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func (a *Arena) NewObject() *Value {
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v := a.c.getValue()
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v.t = TypeObject
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v.o.reset()
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return v
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}
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// NewArray returns new empty array value.
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//
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// New entries may be added to the returned array via Set* calls.
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//
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// The returned array is valid until Reset is called on a.
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func (a *Arena) NewArray() *Value {
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v := a.c.getValue()
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v.t = TypeArray
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v.a = v.a[:0]
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return v
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}
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// NewString returns new string value containing s.
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//
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// The returned string is valid until Reset is called on a.
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func (a *Arena) NewString(s string) *Value {
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v := a.c.getValue()
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v.t = typeRawString
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bLen := len(a.b)
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a.b = escapeString(a.b, s)
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v.s = b2s(a.b[bLen+1 : len(a.b)-1])
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return v
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}
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// NewStringBytes returns new string value containing b.
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//
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// The returned string is valid until Reset is called on a.
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func (a *Arena) NewStringBytes(b []byte) *Value {
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v := a.c.getValue()
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v.t = typeRawString
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bLen := len(a.b)
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a.b = escapeString(a.b, b2s(b))
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v.s = b2s(a.b[bLen+1 : len(a.b)-1])
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return v
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}
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// NewNumberFloat64 returns new number value containing f.
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//
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// The returned number is valid until Reset is called on a.
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func (a *Arena) NewNumberFloat64(f float64) *Value {
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v := a.c.getValue()
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v.t = TypeNumber
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bLen := len(a.b)
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a.b = strconv.AppendFloat(a.b, f, 'g', -1, 64)
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v.s = b2s(a.b[bLen:])
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return v
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}
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// NewNumberInt returns new number value containing n.
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//
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// The returned number is valid until Reset is called on a.
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func (a *Arena) NewNumberInt(n int) *Value {
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v := a.c.getValue()
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v.t = TypeNumber
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bLen := len(a.b)
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a.b = strconv.AppendInt(a.b, int64(n), 10)
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v.s = b2s(a.b[bLen:])
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return v
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}
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// NewNumberString returns new number value containing s.
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//
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// The returned number is valid until Reset is called on a.
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func (a *Arena) NewNumberString(s string) *Value {
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v := a.c.getValue()
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v.t = TypeNumber
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v.s = s
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return v
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}
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// NewNull returns null value.
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func (a *Arena) NewNull() *Value {
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return valueNull
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}
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// NewTrue returns true value.
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func (a *Arena) NewTrue() *Value {
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return valueTrue
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}
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// NewFalse return false value.
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func (a *Arena) NewFalse() *Value {
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return valueFalse
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}
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