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parser.go: SymColon resets the firstToken flag; that is needed to specify range indeces that can define negative limits

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This commit is contained in:
Celestino Amoroso 2024-06-19 09:22:40 +02:00
parent 019470faf1
commit d63b18fd76
1 changed files with 13 additions and 1 deletions
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14
parser.go
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@ -325,6 +325,14 @@ func couldBeACollection(t *term) bool {
return sym == SymList || sym == SymString || sym == SymDict || sym == SymExpression || sym == SymVariable
}
// func areSymbolsOutOfCtx(tk *Token, ctxTerm *term, syms ...Symbol) bool {
// var areOut = false
// if ctxTerm != nil {
// areOut = tk.IsOneOf(syms)
// }
// return areOut
// }
func (self *parser) parseGeneral(scanner *scanner, allowForest bool, allowVarRef bool, termSymbols ...Symbol) (tree *ast, err error) {
var selectorTerm *term = nil
var currentTerm *term = nil
@ -332,7 +340,7 @@ func (self *parser) parseGeneral(scanner *scanner, allowForest bool, allowVarRef
tree = NewAst()
firstToken := true
// lastSym := SymUnknown
for tk = scanner.Next(); err == nil && tk != nil && !tk.IsTerm(termSymbols); tk = scanner.Next() {
for tk = scanner.Next(); err == nil && tk != nil && !tk.IsTerm(termSymbols); /*&& !areSymbolsOutOfCtx(tk, selectorTerm, SymColon, SymDoubleColon)*/ tk = scanner.Next() {
if tk.Sym == SymComment {
continue
}
@ -438,6 +446,10 @@ func (self *parser) parseGeneral(scanner *scanner, allowForest bool, allowVarRef
} else {
currentTerm, err = tree.addToken2(tk)
}
if tk.IsSymbol(SymColon) {
// Colon outside a selector term acts like a separator
firstToken = true
}
default:
currentTerm, err = tree.addToken2(tk)
}