73 lines
1.4 KiB
Go
73 lines
1.4 KiB
Go
package codegen
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import (
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"bytes"
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"fmt"
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"strings"
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"text/template"
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"git.kmsign.com/royalcat/repogen/internal/code"
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)
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const functionTemplate = `
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func {{.Name}}({{.GenParams}}){{.GenReturns}} {
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{{.Body.Code}}
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}
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`
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// FunctionBuilder is an implementer of a function.
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type FunctionBuilder struct {
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Name string
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Params []code.Param
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Returns []code.Type
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Body FunctionBody
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}
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// Impl writes function declatation code to the buffer.
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func (fb FunctionBuilder) Impl(buffer *bytes.Buffer) error {
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tmpl, err := template.New("function").Parse(functionTemplate)
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if err != nil {
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return err
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}
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// writing to a buffer should not cause errors.
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_ = tmpl.Execute(buffer, fb)
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return nil
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}
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func (fb FunctionBuilder) GenParams() string {
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return generateParams(fb.Params)
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}
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func (fb FunctionBuilder) GenReturns() string {
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return generateReturns(fb.Returns)
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}
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func generateParams(params []code.Param) string {
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var paramList []string
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for _, param := range params {
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paramList = append(
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paramList,
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fmt.Sprintf("%s %s", param.Name, param.Type.Code()),
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)
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}
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return strings.Join(paramList, ", ")
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}
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func generateReturns(returns []code.Type) string {
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if len(returns) == 0 {
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return ""
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}
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if len(returns) == 1 {
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return " " + returns[0].Code()
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}
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var returnList []string
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for _, ret := range returns {
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returnList = append(returnList, ret.Code())
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}
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return fmt.Sprintf(" (%s)", strings.Join(returnList, ", "))
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}
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