func (st *state) callOffset(c byte) {
	if c == 0 {
		if len(st.str) == 0 {
			st.fail("missing call offset")
		}
		c = st.str[0]
		st.advance(1)
	}
	switch c {
	case 'h':
		st.number()
	case 'v':
		st.number()
		if len(st.str) == 0 || st.str[0] != '_' {
			st.fail("expected _ after number")
		}
		st.advance(1)
		st.number()
	default:
		st.failEarlier("unrecognized call offset code", 1)
	}
	if len(st.str) == 0 || st.str[0] != '_' {
		st.fail("expected _ after call offset")
	}
	st.advance(1)
}
func (st *state) callOffset(c byte) {
	if c == 0 {
		if len(st.str) == 0 {
			st.fail("missing call offset")
		}
		c = st.str[0]
		st.advance(1)
	}
	switch c {
	case 'h':
		st.number()
	case 'v':
		st.number()
		if len(st.str) == 0 || st.str[0] != '_' {
			st.fail("expected _ after number")
		}
		st.advance(1)
		st.number()
	default:
		st.failEarlier("unrecognized call offset code", 1)
	}
	if len(st.str) == 0 || st.str[0] != '_' {
		st.fail("expected _ after call offset")
	}
	st.advance(1)
}
func ( st * state ) callOffset ( c byte ) { if c == 0 { if len ( st . str ) == 0 { st . fail ( " " ) } c = st . str [ 0 ] st . advance ( 1 ) } switch c { case 'h' : st . number ( ) case 'v' : st . number ( ) if len ( st . str ) == 0 || st . str [ 0 ] != '_' { st . fail ( " " ) } st . advance ( 1 ) st . number ( ) default : st . failEarlier ( " " , 1 ) } if len ( st . str ) == 0 || st . str [ 0 ] != '_' { st . fail ( " " ) } st . advance ( 1 ) }
// <call-offset> ::= h <nv-offset> _
//               ::= v <v-offset> _
//
// <nv-offset> ::= <(offset) number>
//
// <v-offset> ::= <(offset) number> _ <(virtual offset) number>
//
// The c parameter, if not 0, is a character we just read which is the
// start of the <call-offset>.
//
// We don't display the offset information anywhere.
<call - offset > :: = h <nv - offset > _ :: = v <v - offset > _ <nv - offset > :: = < ( offset ) number > <v - offset > :: = < ( offset ) number > _ < ( virtual offset ) number > The c parameter if not 0 is a character we just read which is the start of the <call - offset > . We don t display the offset information anywhere .