Add example with lua built-in function
This commit is contained in:
eleksir
4
.gitignore
vendored
4
.gitignore
vendored
@@ -1,2 +1,6 @@
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/01-LoadJsonFile
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/02-TestLuaScript
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/03-UseGoFuncInLua
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/doll
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/doll-master
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/*.exe
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33
Makefile
33
Makefile
@@ -13,9 +13,9 @@ WINDOWS_BINARY2=${MYNAME2}.exe
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RMCMD=rm -rf
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EXAMPLE01=01-LoadJsonFile
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EXAMPLE02=02-TestLuaScript
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EXAMPLE03=03-UseGoFuncInLua
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# На windows имя бинарника может зависеть не только от платформы, но и от выбранной цели, для linux-а суффикс .exe
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# не нужен
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# On windows binary name can depend not only on platform selected, but target too, we need no .exe suffix for linux bin.
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ifeq ($(OS),Windows_NT)
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ifdef GOOS
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ifeq ($(GOOS),windows)
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@@ -34,7 +34,7 @@ RMCMD=DEL /Q /F
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endif
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endif
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# Явно определяем символ новой строки, чтобы избежать неоднозначности на windows
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# Set newline symbol explicitly to aboud undefined behaviour in windows.
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define IFS
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endef
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@@ -77,6 +77,8 @@ ifeq ($(SHELL),sh.exe)
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if exist ${EXAMPLE01} ${RMCMD} ${EXAMPLE01}
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if exist ${EXAMPLE02}.exe ${RMCMD} ${EXAMPLE02}.exe
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if exist ${EXAMPLE02} ${RMCMD} ${EXAMPLE02}
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if exist ${EXAMPLE03}.exe ${RMCMD} ${EXAMPLE03}.exe
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if exist ${EXAMPLE03} ${RMCMD} ${EXAMPLE03}
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else # not ifeq ($(SHELL),sh.exe)
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${RMCMD} ./${WINDOWS_BINARY1}
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${RMCMD} ./${UNIX_BINARY1}
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@@ -86,12 +88,15 @@ else # not ifeq ($(SHELL),sh.exe)
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${RMCMD} ./${EXAMPLE01}
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${RMCMD} ./${EXAMPLE02}.exe
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${RMCMD} ./${EXAMPLE02}
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${RMCMD} ./${EXAMPLE03}.exe
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${RMCMD} ./${EXAMPLE03}
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endif # ifeq ($(SHELL),sh.exe)
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else # not ifeq ($(OS),Windows_NT)
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${RMCMD} ./${UNIX_BINARY1}
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${RMCMD} ./${UNIX_BINARY2}
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${RMCMD} ${EXAMPLE01}
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${RMCMD} ${EXAMPLE02}
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${RMCMD} ${EXAMPLE03}
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endif
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@@ -121,7 +126,7 @@ else # not ($(OS),Windows_NT)
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endif # ifeq ($(OS),Windows_NT)
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02-TestLuaScript: clean
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${EXAMPLE02}: clean
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ifeq ($(OS),Windows_NT)
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# Looks like on windows gnu make explicitly set SHELL to sh.exe, if it was not set.
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ifeq ($(SHELL), sh.exe)
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@@ -141,4 +146,24 @@ else # not ($(OS),Windows_NT)
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endif # ifeq ($(OS),Windows_NT)
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${EXAMPLE03}: clean
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ifeq ($(OS),Windows_NT)
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# Looks like on windows gnu make explicitly set SHELL to sh.exe, if it was not set.
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ifeq ($(SHELL), sh.exe)
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# # Vanilla cmd.exe / powershell.
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SET "CGO_ENABLED=0"
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go build ${BUILDOPTS} -o ${EXAMPLE03}.exe ./cmd/${EXAMPLE03}
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else ifeq (,$(findstring(Git/usr/bin/sh.exe, $(SHELL))))
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# # git-bash
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CGO_ENABLED=0 go build ${BUILDOPTS} -o ${EXAMPLE03}.exe ./cmd/${EXAMPLE03}
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else # not ifeq (,$(findstring(Git/usr/bin/sh.exe, $(SHELL))))
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# # Some other shell.
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# # TODO: handle it.
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$(info "-- Dunno how to handle this shell: ${SHELL}")
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endif # ifeq (,$(findstring(Git/usr/bin/sh.exe, $(SHELL))))
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else # not ($(OS),Windows_NT)
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CGO_ENABLED=0 go build ${BUILDOPTS} -o ${EXAMPLE03} ./cmd/${EXAMPLE03}
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endif # ifeq ($(OS),Windows_NT)
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# vim: set ft=make noet ai ts=4 sw=4 sts=4:
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3
example_data/03-test.lua
Normal file
3
example_data/03-test.lua
Normal file
@@ -0,0 +1,3 @@
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print("4 * 4 = " .. square(4))
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-- vim: set ft=lua noet ai ts=4 sw=4 sts=4:
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59
examples/03-UseGoFuncInLua/main.go
Normal file
59
examples/03-UseGoFuncInLua/main.go
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@@ -0,0 +1,59 @@
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package main
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// This exmple taken from 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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