62 lines
1.8 KiB
Go
62 lines
1.8 KiB
Go
package fejkdata
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import (
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"strings"
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)
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// holdSet is one render's reference draws: the unnamed draw group's, and each named one's.
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type holdSet struct {
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unnamed hold
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named map[string]*hold
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}
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// renderScope is where a render reads its reference paths: a hold set, in the draw group of the
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// template rendering, and the row a table's format is rendering, which its columns read.
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type renderScope struct {
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set *holdSet
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group string
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t *table
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row int
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}
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// eagerHoldSet makes the unnamed group's maps where the set is declared, keeping them on that frame's
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// stack for a render that reads through them; lazyHoldSet makes them on its first read instead.
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func eagerHoldSet(s *session) holdSet {
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return holdSet{unnamed: hold{variant: map[string]node{}, value: map[string]draw{}, s: s}}
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}
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func lazyHoldSet(s *session) holdSet {
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return holdSet{unnamed: hold{s: s}}
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}
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// renderOnce renders n as one render, over a hold set of its own.
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func renderOnce(s *session, n node) string {
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set := lazyHoldSet(s)
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return render(s, n, renderScope{set: &set})
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}
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// in is the scope t renders in: its draw group where it names one, else its caller's.
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func (sc renderScope) in(t *template) renderScope {
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if t.drawGroupKey != "" {
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sc.group = t.drawGroupKey
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}
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return sc
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}
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// hold is the set's hold for sc's draw group. The session is passed in rather than
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// read out of the set: copying it from there would leak the set's maps to the heap.
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func (sc renderScope) hold(s *session) *hold {
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if sc.group == "" {
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return &sc.set.unnamed
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}
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d, drew := sc.set.named[sc.group]
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if !drew {
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if sc.set.named == nil {
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sc.set.named = map[string]*hold{}
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}
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d = &hold{variant: map[string]node{}, value: map[string]draw{}, s: s}
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sc.set.named[strings.Clone(sc.group)] = d // a key from sc would leak sc, and with it every render's hold set, to the heap
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}
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return d
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}
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