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Return true on AcceptWhile and AcceptWhileNot functions

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This commit is contained in:
Alexander Kiryukhin 2022-02-02 21:19:32 +03:00
parent ff198abd8f
commit d8d462d3f9
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GPG key ID: 6DF7A2910D0699E9
2 changed files with 11 additions and 4 deletions
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5
example/math_expression/stack.go
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@ -1,3 +1,4 @@
//go:build example
// +build example // +build example
package main package main
@ -10,7 +11,7 @@ type lexemStack []unilex.Lexem
func (ls *lexemStack) Head() (l unilex.Lexem) { func (ls *lexemStack) Head() (l unilex.Lexem) {
if len(*ls) == 0 { if len(*ls) == 0 {
return unilex.Lexem{Type: unilex.LEOF} return unilex.Lexem{Type: unilex.LexEOF}
} }
return (*ls)[len(*ls)-1] return (*ls)[len(*ls)-1]
} }
@ -21,7 +22,7 @@ func (ls *lexemStack) Push(l unilex.Lexem) {
func (ls *lexemStack) Pop() (l unilex.Lexem) { func (ls *lexemStack) Pop() (l unilex.Lexem) {
if len(*ls) == 0 { if len(*ls) == 0 {
return unilex.Lexem{Type: unilex.LEOF} return unilex.Lexem{Type: unilex.LexEOF}
} }
*ls, l = (*ls)[:len(*ls)-1], (*ls)[len(*ls)-1] *ls, l = (*ls)[:len(*ls)-1], (*ls)[len(*ls)-1]
return l return l

10
lexer.go
View file

@ -134,16 +134,22 @@ func (l *Lexer) AcceptAnyOf(s []string, caseInsentive bool) bool {
} }
// AcceptWhile passing symbols from input while they at `valid` string. // AcceptWhile passing symbols from input while they at `valid` string.
func (l *Lexer) AcceptWhile(valid string) { func (l *Lexer) AcceptWhile(valid string) bool {
isValid := false
for l.Accept(valid) { for l.Accept(valid) {
isValid = true
} }
return isValid
} }
// AcceptWhileNot passing symbols from input while they NOT in `invalid` string. // AcceptWhileNot passing symbols from input while they NOT in `invalid` string.
func (l *Lexer) AcceptWhileNot(invalid string) { func (l *Lexer) AcceptWhileNot(invalid string) bool {
isValid := false
for !strings.ContainsRune(invalid, l.Next()) { for !strings.ContainsRune(invalid, l.Next()) {
isValid = true
} }
l.Back() l.Back()
return isValid
} }
// AtStart returns true if current lexem not empty // AtStart returns true if current lexem not empty