/
FloatSciReader.go
52 lines (45 loc) · 1.08 KB
/
FloatSciReader.go
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package main
import (
"strconv"
)
type FloatSciReader struct {
TokenizerData
}
func NewFloatSciReader(rs []Rune) *FloatSciReader {
return &FloatSciReader{TokenizerData{rs}}
}
func (rr *FloatSciReader) parseBuffer() (Token, error) {
if !rr.last().IsDigit() {
return nil, rr.Context().Error("invalid float literal")
} else {
f64, err := strconv.ParseFloat(string(rr.Runes()), 64)
if err != nil {
return nil, rr.Context().Error("invalid float literal")
} else {
t := NewFloat(f64, rr.Context())
return t, nil
}
}
}
func (rr *FloatSciReader) Ingest(r Rune, ew ErrorWriter) (Tokenizer, []Token) {
switch {
case r.IsDigit():
return NewFloatSciReader(append(rr.buf, r)), nil
case (r.Is('+') || r.Is('-')) && rr.last().Is('e'):
return NewFloatSciReader(append(rr.buf, r)), nil
default:
newTr := dispatchTokenizer(r, ew)
t, err := rr.parseBuffer()
if err != nil {
ew.Add(err)
return newTr, nil
} else {
return newTr, []Token{t}
}
}
}
func (rr *FloatSciReader) Finalize(ew ErrorWriter) []Token {
t, err := rr.parseBuffer()
ew.Add(err)
return []Token{t}
}