lexing duration values

master
Jordan Orelli 10 years ago
parent 04b6840cca
commit 480bffc761

@ -6,6 +6,7 @@ import (
"fmt"
"io"
"strings"
"time"
"unicode"
)
@ -43,6 +44,8 @@ func (t tokenType) String() string {
return "t_variable"
case t_bool:
return "t_bool"
case t_duration:
return "t_duration"
default:
panic(fmt.Sprintf("unknown token type: %v", t))
}
@ -64,6 +67,7 @@ const (
t_imaginary_number // an imaginary number
t_variable // e.g. @var_name, a variable name.
t_bool // a boolean token (true|false)
t_duration // a duration (e.g.: 1s, 2h45m, 900ms)
)
type stateFn func(*lexer) stateFn
@ -404,7 +408,8 @@ func lexNumber(l *lexer) stateFn {
imaginary := l.accept("i")
r := l.next()
if isAlphaNumeric(r) {
return lexErrorf("unexpected alphanum in lexNumber: %c", r)
l.keep(r)
return lexDuration
}
l.unread(r)
if imaginary {
@ -415,6 +420,63 @@ func lexNumber(l *lexer) stateFn {
return lexRoot
}
func lexDuration(l *lexer) stateFn {
r := l.next()
switch {
case r == '\n', r == ';':
_, err := time.ParseDuration(string(l.buf))
if err == nil {
l.emit(t_duration)
return lexRoot
}
l.emit(t_string)
return lexRoot
case unicode.IsSpace(r):
_, err := time.ParseDuration(string(l.buf))
if err == nil {
l.emit(t_duration)
return lexRoot
}
l.keep(r)
return lexNameOrString
case r == ':':
_, err := time.ParseDuration(string(l.buf))
if err == nil {
l.emit(t_duration)
} else {
l.emit(t_string)
}
l.keep(r)
l.emit(t_object_separator)
return lexRoot
case isSpecial(r):
_, err := time.ParseDuration(string(l.buf))
if err == nil {
l.emit(t_duration)
} else {
l.emit(t_string)
}
l.unread(r)
return lexRoot
case r == '\\':
l.unread(r)
return lexNameOrString
case r == eof:
_, err := time.ParseDuration(string(l.buf))
if err == nil {
l.emit(t_duration)
} else {
l.emit(t_string)
}
return nil
case unicode.IsGraphic(r):
l.keep(r)
return lexDuration
default:
return lexErrorf("unhandled character type in lexDuration: %c", r)
}
}
func isAlphaNumeric(r rune) bool {
return r == '_' || unicode.IsLetter(r) || unicode.IsDigit(r)
}

@ -0,0 +1,10 @@
300ms
-1.5h
2h45m
9ns
18us
45µs
900ms
275s
89m
927h

@ -0,0 +1,10 @@
{t_duration 300ms}
{t_duration -1.5h}
{t_duration 2h45m}
{t_duration 9ns}
{t_duration 18us}
{t_duration 45µs}
{t_duration 900ms}
{t_duration 275s}
{t_duration 89m}
{t_duration 927h}
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