Squashed 'backend/goldmark/' content from commit 379bf24

git-subtree-dir: backend/goldmark
git-subtree-split: 379bf24a47e6ef07f34d7536aead86d8792ac300

_tools/gen-emb-structs.go

@@ -0,0 +1,143 @@
+package main
+
+import (
+	"encoding/json"
+	"flag"
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+func embStructsSubCommand(args []string) {
+	cmdName := "emb-structs"
+	cmd := flag.NewFlagSet(cmdName, flag.ExitOnError)
+	cmd.Usage = func() {
+		_, _ = fmt.Fprintf(cmd.Output(), `Usage of %s:
+
+  Embed Go structs as compact format in the binary.
+  JSON file format:
+    {
+      "prefix": "html5entities", // prefix for the generated const/var
+      "types": { // struct field types
+          "Name": "string",         // struct fields
+          "CodePoints": "[]int",
+          "Characters": "[]byte"
+      },
+
+      // array of struct data
+      // all data must be a string
+      "data": [ 
+        {"Name": "AElig", "CodePoints": ["198"], "Characters": ["0xc3", "0x86"]},
+        {"Name": "AMP", "CodePoints": ["38"], "Characters": ["0x26"]},
+      ]
+    }
+
+`, cmdName)
+		cmd.PrintDefaults()
+	}
+
+	inputJSONPath := cmd.String("i", "", "source JSON file path(required)")
+	outputPath := cmd.String("o", "", "output file path(required)")
+
+	if err := cmd.Parse(args); err != nil ||
+		len(*inputJSONPath) == 0 ||
+		len(*outputPath) == 0 {
+		usage(cmd.Usage, err)
+	}
+	var source map[string]any
+	inputJSONSource, err := os.ReadFile(*inputJSONPath)
+	if err != nil {
+		panic(err)
+	}
+	if err := json.Unmarshal(inputJSONSource, &source); err != nil {
+		panic(err)
+	}
+
+	f, err := os.Create(*outputPath)
+	if err != nil {
+		fmt.Printf("Failed to open %s: %v\n", *outputPath, err)
+		os.Exit(1)
+	}
+	defer f.Close()
+
+	abs, _ := filepath.Abs(*outputPath)
+	pkg := filepath.Base(filepath.Dir(abs))
+
+	write := func(ft string, v ...any) {
+		if len(v) == 0 {
+			_, _ = f.WriteString(ft)
+			return
+		}
+		_, _ = f.WriteString(fmt.Sprintf(ft, v...))
+	}
+	writeln := func(ft string, v ...any) {
+		write(ft+"\n", v...)
+	}
+
+	writeln("// Code generated by _tools; DO NOT EDIT.")
+	writeln("package " + pkg)
+
+	prefix := source["prefix"].(string)
+	types := source["types"].(map[string]any)
+	data := source["data"].([]any)
+
+	writeln("const _%sLength = %d", prefix, len(data))
+
+	for prop, _typ := range types {
+		typ := _typ.(string)
+		if typ == "string" {
+			write("const _%s%s string = \"", prefix, prop)
+			for _, _d := range data {
+				d := _d.(map[string]any)
+				v := d[prop].(string)
+				write(v)
+			}
+			writeln(`"`)
+			write("const _%s%sIndex  = \"", prefix, prop)
+			for _, _d := range data {
+				d := _d.(map[string]any)
+				v := d[prop].(string)
+				write("\\x%02x", len(v))
+			}
+			writeln(`"`)
+			continue
+		}
+
+		if strings.HasPrefix(typ, "[]") {
+			elmTyp := typ[2:]
+			write("var _%s%s = [...]%s{", prefix, prop, elmTyp)
+			for i, _d := range data {
+				d := _d.(map[string]any)
+				arr := d[prop].([]any)
+				for j, a := range arr {
+					v := a.(string)
+					write(v)
+					if i != len(data)-1 || j != len(arr)-1 {
+						write(", ")
+					}
+				}
+			}
+			writeln("}")
+			write("var _%s%sIndex  = \"", prefix, prop)
+			for _, _d := range data {
+				d := _d.(map[string]any)
+				arr := d[prop].([]any)
+				write("\\x%02x", len(arr))
+			}
+			writeln(`"`)
+			continue
+		}
+
+		write("var _%s%s = [...]%s{", prefix, prop, typ)
+		for i, _d := range data {
+			d := _d.(map[string]any)
+			v := d[prop].(string)
+			write(v)
+			if i != len(data)-1 {
+				write(", ")
+			}
+		}
+		writeln(`}`)
+	}
+}