camoroso
8e596d5979
1. moved scan/symbol.go to new package sym and adapted all files that reference Symbol type and its values. 2. new type interval defined by begin, end and step values. 3. replaced operator-range.go with operator-interval.go. 4. replaced range operator begin:end with begin..end..step. 5. new implementation of sub-collection extraction based on new interval literal.
37 lines
854 B
Go
37 lines
854 B
Go
// Copyright (c) 2024-2026 Celestino Amoroso (celestino.amoroso@gmail.com).
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// All rights reserved.
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// operand-expr.go
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package expr
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import (
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"fmt"
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"git.portale-stac.it/go-pkg/expr/kern"
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"git.portale-stac.it/go-pkg/expr/scan"
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"git.portale-stac.it/go-pkg/expr/sym"
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)
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// -------- expr term
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func newExprTerm(root *scan.Term) *scan.Term {
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tk := scan.NewValueToken(root.Tk.Row(), root.Tk.Col(), sym.SymExpression, root.Source(), root)
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return &scan.Term{
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Tk: *tk,
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Parent: nil,
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Children: nil,
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Position: scan.PosLeaf,
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Priority: scan.PriValue,
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EvalFunc: evalExpr,
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}
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}
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// -------- eval expr
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func evalExpr(ctx kern.ExprContext, opTerm *scan.Term) (v any, err error) {
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if ast, ok := opTerm.Value().(*scan.Term); ok {
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v, err = ast.Compute(ctx)
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} else {
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err = fmt.Errorf("expression expected, got %T", opTerm.Value())
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}
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return
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}
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