mirror of
https://github.com/mikefarah/yq.git
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331 lines
7.1 KiB
Go
331 lines
7.1 KiB
Go
//go:build !yq_nolua
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package yqlib
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import (
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"fmt"
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"io"
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"strings"
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)
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type luaEncoder struct {
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docPrefix string
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docSuffix string
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indent int
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indentStr string
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unquoted bool
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globals bool
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escape *strings.Replacer
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}
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func (le *luaEncoder) CanHandleAliases() bool {
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return false
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}
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func NewLuaEncoder(prefs LuaPreferences) Encoder {
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escape := strings.NewReplacer(
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"\000", "\\000",
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"\001", "\\001",
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"\002", "\\002",
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"\003", "\\003",
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"\004", "\\004",
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"\005", "\\005",
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"\006", "\\006",
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"\007", "\\a",
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"\010", "\\b",
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"\011", "\\t",
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"\012", "\\n",
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"\013", "\\v",
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"\014", "\\f",
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"\015", "\\r",
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"\016", "\\014",
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"\017", "\\015",
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"\020", "\\016",
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"\021", "\\017",
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"\022", "\\018",
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"\023", "\\019",
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"\024", "\\020",
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"\025", "\\021",
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"\026", "\\022",
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"\027", "\\023",
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"\030", "\\024",
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"\031", "\\025",
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"\032", "\\026",
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"\033", "\\027",
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"\034", "\\028",
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"\035", "\\029",
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"\036", "\\030",
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"\037", "\\031",
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"\"", "\\\"",
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"'", "\\'",
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"\\", "\\\\",
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"\177", "\\127",
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)
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unescape := strings.NewReplacer(
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"\\'", "'",
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"\\\"", "\"",
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"\\n", "\n",
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"\\r", "\r",
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"\\t", "\t",
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"\\\\", "\\",
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)
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return &luaEncoder{unescape.Replace(prefs.DocPrefix), unescape.Replace(prefs.DocSuffix), 0, "\t", prefs.UnquotedKeys, prefs.Globals, escape}
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}
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func (le *luaEncoder) PrintDocumentSeparator(_ io.Writer) error {
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return nil
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}
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func (le *luaEncoder) PrintLeadingContent(_ io.Writer, _ string) error {
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return nil
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}
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func (le *luaEncoder) encodeString(writer io.Writer, node *CandidateNode) error {
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quote := "\""
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switch node.Style {
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case LiteralStyle, FoldedStyle, FlowStyle:
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for i := 0; i < 10; i++ {
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if !strings.Contains(node.Value, "]"+strings.Repeat("=", i)+"]") {
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err := WriteString(writer, "["+strings.Repeat("=", i)+"[\n")
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if err != nil {
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return err
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}
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err = WriteString(writer, node.Value)
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if err != nil {
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return err
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}
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return WriteString(writer, "]"+strings.Repeat("=", i)+"]")
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}
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}
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case SingleQuotedStyle:
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quote = "'"
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// fallthrough to regular ol' string
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}
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return WriteString(writer, quote+le.escape.Replace(node.Value)+quote)
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}
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func (le *luaEncoder) writeIndent(writer io.Writer) error {
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if le.indentStr == "" {
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return nil
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}
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err := WriteString(writer, "\n")
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if err != nil {
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return err
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}
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return WriteString(writer, strings.Repeat(le.indentStr, le.indent))
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}
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func (le *luaEncoder) encodeArray(writer io.Writer, node *CandidateNode) error {
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err := WriteString(writer, "{")
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if err != nil {
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return err
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}
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le.indent++
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for _, child := range node.Content {
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err = le.writeIndent(writer)
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if err != nil {
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return err
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}
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err := le.encodeAny(writer, child)
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if err != nil {
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return err
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}
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err = WriteString(writer, ",")
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if err != nil {
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return err
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}
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if child.LineComment != "" {
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sansPrefix, _ := strings.CutPrefix(child.LineComment, "#")
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err = WriteString(writer, " --"+sansPrefix)
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if err != nil {
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return err
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}
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}
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}
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le.indent--
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if len(node.Content) != 0 {
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err = le.writeIndent(writer)
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if err != nil {
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return err
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}
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}
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return WriteString(writer, "}")
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}
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func needsQuoting(s string) bool {
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// known keywords as of Lua 5.4
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switch s {
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case "do", "and", "else", "break",
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"if", "end", "goto", "false",
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"in", "for", "then", "local",
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"or", "nil", "true", "until",
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"elseif", "function", "not",
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"repeat", "return", "while":
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return true
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}
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// [%a_][%w_]*
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for i, c := range s {
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if i == 0 {
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if !((c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') || c == '_') {
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return true
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}
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} else {
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if !((c >= '0' && c <= '9') || (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') || c == '_') {
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return true
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}
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}
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}
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return false
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}
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func (le *luaEncoder) encodeMap(writer io.Writer, node *CandidateNode, global bool) error {
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if !global {
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err := WriteString(writer, "{")
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if err != nil {
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return err
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}
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le.indent++
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}
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for i, child := range node.Content {
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if (i % 2) == 1 {
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// value
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err := le.encodeAny(writer, child)
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if err != nil {
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return err
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}
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err = WriteString(writer, ";")
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if err != nil {
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return err
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}
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} else {
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// key
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if !global || i > 0 {
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err := le.writeIndent(writer)
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if err != nil {
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return err
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}
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}
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if (le.unquoted || global) && child.Tag == "!!str" && !needsQuoting(child.Value) {
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err := WriteString(writer, child.Value+" = ")
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if err != nil {
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return err
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}
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} else {
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if global {
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// This only works in Lua 5.2+
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err := WriteString(writer, "_ENV")
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if err != nil {
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return err
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}
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}
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err := WriteString(writer, "[")
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if err != nil {
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return err
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}
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err = le.encodeAny(writer, child)
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if err != nil {
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return err
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}
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err = WriteString(writer, "] = ")
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if err != nil {
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return err
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}
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}
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}
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if child.LineComment != "" {
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sansPrefix, _ := strings.CutPrefix(child.LineComment, "#")
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err := WriteString(writer, strings.Repeat(" ", i%2)+"--"+sansPrefix)
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if err != nil {
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return err
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}
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if (i % 2) == 0 {
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// newline and indent after comments on keys
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err = le.writeIndent(writer)
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if err != nil {
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return err
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}
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}
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}
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}
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if global {
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return WriteString(writer, "\n")
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}
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le.indent--
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if len(node.Content) != 0 {
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err := le.writeIndent(writer)
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if err != nil {
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return err
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}
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}
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return WriteString(writer, "}")
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}
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func (le *luaEncoder) encodeAny(writer io.Writer, node *CandidateNode) error {
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switch node.Kind {
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case SequenceNode:
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return le.encodeArray(writer, node)
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case MappingNode:
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return le.encodeMap(writer, node, false)
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case ScalarNode:
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switch node.Tag {
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case "!!str":
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return le.encodeString(writer, node)
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case "!!null":
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// TODO reject invalid use as a table key
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return WriteString(writer, "nil")
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case "!!bool":
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// Yaml 1.2 has case variation e.g. True, FALSE etc but Lua only has
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// lower case
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return WriteString(writer, strings.ToLower(node.Value))
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case "!!int":
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if strings.HasPrefix(node.Value, "0o") {
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_, octalValue, err := parseInt64(node.Value)
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if err != nil {
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return err
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}
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return WriteString(writer, fmt.Sprintf("%d", octalValue))
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}
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return WriteString(writer, strings.ToLower(node.Value))
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case "!!float":
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switch strings.ToLower(node.Value) {
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case ".inf", "+.inf":
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return WriteString(writer, "(1/0)")
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case "-.inf":
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return WriteString(writer, "(-1/0)")
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case ".nan":
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return WriteString(writer, "(0/0)")
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default:
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return WriteString(writer, node.Value)
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}
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default:
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return fmt.Errorf("Lua encoder NYI -- %s", node.Tag)
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}
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default:
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return fmt.Errorf("Lua encoder NYI -- %s", node.Tag)
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}
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}
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func (le *luaEncoder) encodeTopLevel(writer io.Writer, node *CandidateNode) error {
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err := WriteString(writer, le.docPrefix)
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if err != nil {
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return err
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}
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err = le.encodeAny(writer, node)
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if err != nil {
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return err
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}
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return WriteString(writer, le.docSuffix)
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}
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func (le *luaEncoder) Encode(writer io.Writer, node *CandidateNode) error {
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if le.globals {
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if node.Kind != MappingNode {
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return fmt.Errorf("--lua-global requires a top level MappingNode")
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}
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return le.encodeMap(writer, node, true)
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}
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return le.encodeTopLevel(writer, node)
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}
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