103 lines
2.3 KiB
Go
103 lines
2.3 KiB
Go
package tcl
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import (
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"log"
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"os"
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"github.com/davecgh/go-spew/spew"
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. "github.com/oec/goparsify"
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)
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// Tcl parser, using combinators
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// Based on the grammer in:
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// https://wiki.tcl-lang.org/page/BNF+for+Tcl
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var (
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word Parser
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words Parser
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command Parser
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script Parser
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)
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var (
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comment = NewParser("comment", Merge(Seq("#", NotChars("\r\n"), Chars("\r\n")))).Map(drop)
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wordExp = NewParser("{*}word", Seq("{*}", &word)).Map(resultchild(1))
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wordSub = NewParser("[*]word", Seq("[*]", &word)).Map(resultchild(1))
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wordQtd = NewParser(`"word"`, StringLit(`"`)).Map(token)
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wordSmp = NewParser("simple", NotChars("{} \t\r\n")).Map(token)
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group = NewParser("{group}", Seq("{", Maybe(Chars("\r\n")), Some(Any(&command, &words)), "}")).Map(func(r *Result) { collectchildren(&r.Child[2]); r.Result = r.Child[2].Result })
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)
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func init() {
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word = NewParser("word", Any(&wordQtd, &group, &wordSmp, &wordSub, &wordExp))
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words = NewParser("words", Many(&word)).Map(collectchildren)
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command = NewParser("command", Seq(&words, Any(";", Chars("\r\n")))).Map(resultchild(0))
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script = NewParser("script", Many(Any(&comment, &command))).Map(collectchildren)
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}
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func simpleWhitespace(s *State) {
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for s.Pos < len(s.Input) {
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switch s.Input[s.Pos] {
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case '\t', '\v', '\f', ' ':
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s.Pos++
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default:
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return
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}
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}
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}
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func Parse(input string) (data interface{}, e error) {
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data, e = Run(&script, input, simpleWhitespace)
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return
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}
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func ParseDebug(input string) (data interface{}, e error) {
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EnableLogging(os.Stdout)
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data, e = Run(&script, input, simpleWhitespace)
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return
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}
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func found(typ string) func(*Result) {
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return func(r *Result) {
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log.Printf("found a %s: %q (r.R: %v)\n", typ, r.Token, r.Result)
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r.Result = r.Token
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}
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}
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func drop(r *Result) {
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r.Token = ""
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r.Result = nil
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}
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func token(r *Result) {
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r.Result = r.Token
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// log.Println("token:", r.Token)
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}
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func collectchildren(r *Result) {
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data := []string{}
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for _, ch := range r.Child {
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switch v := ch.Result.(type) {
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case string:
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data = append(data, v)
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case []string:
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data = append(data, v...)
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default:
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// log.Println("oops:", r)
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}
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}
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// log.Println("data: ", data)
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r.Result = data
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}
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func resultchild(c int) func(*Result) {
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return func(r *Result) {
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r.Result = r.Child[c].Result
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// log.Printf("child[%d]: %v\n", c, r.Result)
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}
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}
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func dump(r *Result) {
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spew.Dump(r)
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}
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