vise/go/resource/resource.go

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package resource
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import (
"context"
"fmt"
"log"
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"strings"
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)
// EntryFunc is a function signature for retrieving value for a key
type EntryFunc func(ctx context.Context) (string, error)
type CodeFunc func(sym string) ([]byte, error)
type TemplateFunc func(sym string, sizer *Sizer) (string, error)
type FuncForFunc func(sym string) (EntryFunc, error)
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// Resource implementation are responsible for retrieving values and templates for symbols, and can render templates from value dictionaries.
type Resource interface {
GetTemplate(sym string, sizer *Sizer) (string, error) // Get the template for a given symbol.
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GetCode(sym string) ([]byte, error) // Get the bytecode for the given symbol.
RenderTemplate(sym string, values map[string]string, idx uint16, sizer *Sizer) (string, error) // Render the given data map using the template of the symbol.
Render(sym string, values map[string]string, idx uint16, sizer *Sizer) (string, error) // Render full output.
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FuncFor(sym string) (EntryFunc, error) // Resolve symbol content point for.
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}
type MenuResource struct {
sinkValues []string
codeFunc CodeFunc
templateFunc TemplateFunc
funcFunc FuncForFunc
}
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// NewMenuResource creates a new MenuResource instance.
func NewMenuResource() *MenuResource {
return &MenuResource{}
}
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// WithCodeGetter sets the code symbol resolver method.
func(m *MenuResource) WithCodeGetter(codeGetter CodeFunc) *MenuResource {
m.codeFunc = codeGetter
return m
}
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// WithEntryGetter sets the content symbol resolver getter method.
func(m *MenuResource) WithEntryFuncGetter(entryFuncGetter FuncForFunc) *MenuResource {
m.funcFunc = entryFuncGetter
return m
}
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// WithTemplateGetter sets the template symbol resolver method.
func(m *MenuResource) WithTemplateGetter(templateGetter TemplateFunc) *MenuResource {
m.templateFunc = templateGetter
return m
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}
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// render menu and all syms except sink, split sink into display chunks
func(m *MenuResource) prepare(sym string, values map[string]string, idx uint16, sizer *Sizer) (map[string]string, error) {
var sink string
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var sinkValues []string
noSinkValues := make(map[string]string)
for k, v := range values {
sz, err := sizer.Size(k)
if err != nil {
return nil, err
}
if sz == 0 {
sink = k
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sinkValues = strings.Split(v, "\n")
v = ""
log.Printf("found sink %s with field count %v", k, len(sinkValues))
}
noSinkValues[k] = v
}
if sink == "" {
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log.Printf("no sink found for sym %s", sym)
return values, nil
}
s, err := m.render(sym, noSinkValues, 0, nil)
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if err != nil {
return nil, err
}
remaining, ok := sizer.Check(s)
if !ok {
return nil, fmt.Errorf("capacity exceeded")
}
log.Printf("%v bytes available for sink split", remaining)
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l := 0
tb := strings.Builder{}
rb := strings.Builder{}
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sizer.AddCursor(0)
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for i, v := range sinkValues {
log.Printf("processing sinkvalue %v: %s", i, v)
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l += len(v)
if uint32(l) > remaining {
if tb.Len() == 0 {
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return nil, fmt.Errorf("capacity insufficient for sink field %v", i)
}
rb.WriteString(tb.String())
rb.WriteRune('\n')
c := uint32(rb.Len())
sizer.AddCursor(c)
tb.Reset()
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l = 0
}
if tb.Len() > 0 {
tb.WriteByte(byte(0x00))
}
tb.WriteString(v)
}
if tb.Len() > 0 {
rb.WriteString(tb.String())
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}
r := rb.String()
r = strings.TrimRight(r, "\n")
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noSinkValues[sink] = r
for i, v := range strings.Split(r, "\n") {
log.Printf("nosinkvalue %v: %s", i, v)
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}
return noSinkValues, nil
}
func(m *MenuResource) RenderTemplate(sym string, values map[string]string, idx uint16, sizer *Sizer) (string, error) {
return DefaultRenderTemplate(m, sym, values, idx, sizer)
}
func(m *MenuResource) FuncFor(sym string) (EntryFunc, error) {
return m.funcFunc(sym)
}
func(m *MenuResource) GetCode(sym string) ([]byte, error) {
return m.codeFunc(sym)
}
func(m *MenuResource) GetTemplate(sym string, sizer *Sizer) (string, error) {
return m.templateFunc(sym, sizer)
}
func(m *MenuResource) render(sym string, values map[string]string, idx uint16, sizer *Sizer) (string, error) {
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var ok bool
r := ""
s, err := m.RenderTemplate(sym, values, idx, sizer)
if err != nil {
return "", err
}
log.Printf("rendered %v bytes for template", len(s))
r += s
if sizer != nil {
_, ok = sizer.Check(r)
if !ok {
return "", fmt.Errorf("limit exceeded: %v", sizer)
}
}
s, err = m.RenderMenu(idx)
if err != nil {
return "", err
}
log.Printf("rendered %v bytes for menu", len(s))
r += s
if sizer != nil {
_, ok = sizer.Check(r)
if !ok {
return "", fmt.Errorf("limit exceeded: %v", sizer)
}
}
return r, nil
}
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func(m *MenuResource) Render(sym string, values map[string]string, idx uint16, sizer *Sizer) (string, error) {
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var err error
values, err = m.prepare(sym, values, idx, sizer)
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if err != nil {
return "", err
}
return m.render(sym, values, idx, sizer)
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}