/
tokenize.go
59 lines (51 loc) · 1.17 KB
/
tokenize.go
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package glisp
import (
"unicode"
"bytes"
"io/ioutil"
)
func TokenizeString(input string) List {
b := bytes.NewBufferString(input)
return Tokenize(b)
}
func TokenizeFile(fname string) List {
fileBytes,err := ioutil.ReadFile(fname)
if err != nil {
return nil
}
b := bytes.NewBuffer(fileBytes)
return Tokenize(b)
}
func Tokenize(bs *bytes.Buffer) List {
if bs.Len() == 0 {
return nil
}
r := List{}
inQuote := false;
acc := ""
for ; bs.Len() > 0 ; {
c := rune(bs.Next(1)[0])
if unicode.IsLetter(c) || unicode.IsNumber(c) || c == '-' || c == '_' || c == '?' {
acc += string(c)
} else if c == '(' {
nested := Tokenize(bs)
r = append(r, nested)
} else if c == ')' {
break
} else if c== '"' {
inQuote = !inQuote
acc += string(c)
} else if inQuote {
acc += string(c)
} else {
if acc != "" {
r = append(r, token(acc))
}
acc = ""
}
}
if acc != "" {
r = append(r, token(acc))
}
return r
}