60 lines
1.3 KiB
Go
60 lines
1.3 KiB
Go
package main
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// https://otm.github.io/2015/07/embedding-lua-in-go/
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import (
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"doll/internal/log"
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"os"
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lua "github.com/yuin/gopher-lua"
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)
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// square multiplies number by itself.
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func square(L *lua.LState) int {
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// get first (1) function argument and convert to int
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i := L.ToInt(1)
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// make calculation and cast to LNumber
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ln := lua.LNumber(i * i)
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// Push it to the stack
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L.Push(ln)
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// Notify that we pushed one value to the stack
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return 1
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}
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func main() {
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// Init log subsystem.
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log.Init("info", os.Stderr)
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file := "example_data/03-test.lua"
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// Load the Lua script file.
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log.Infof("Loading %s", file)
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// We can execute script directly via L.DoFile("./example_data/03-test.lua") but in practice we'll get scripts as
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// strings - snippets from templates - so, testing/checking how it works is not use for project.
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luaCode, err := os.ReadFile(file)
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if err != nil {
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log.Fatalf("Error reading Lua file %s: %s", file, err)
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}
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log.Info("Creating new Lua state")
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L := lua.NewState()
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defer L.Close()
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log.Info("Registering go function as lua built-in function")
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L.SetGlobal("square", L.NewFunction(square))
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log.Info("Evaluating Lua code")
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if err := L.DoString(string(luaCode)); err != nil {
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log.Errorf("Error evaluating Lua code: %s", err)
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os.Exit(1)
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}
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}
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/* vim: set ft=go noet ai ts=4 sw=4 sts=4: */
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