58 lines
1.3 KiB
Go
58 lines
1.3 KiB
Go
// helpers.go
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package expr
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import (
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"fmt"
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"strings"
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)
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func EvalString(ctx exprContext, source string) (result any, err error) {
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var tree *ast
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r := strings.NewReader(source)
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scanner := NewScanner(r, DefaultTranslations())
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parser := NewParser(ctx)
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if tree, err = parser.parse(scanner); err == nil {
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result, err = tree.Eval(ctx)
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}
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return
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}
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type EvalArg struct {
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name string
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value any
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}
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func EvalStringA(source string, args ...EvalArg) (result any, err error) {
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return EvalStringV(source, args)
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}
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func EvalStringV(source string, args []EvalArg) (result any, err error) {
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ctx := NewSimpleFuncStore()
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for _, arg := range args {
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if isFunc(arg.value) {
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if f, ok := arg.value.(FuncTemplate); ok {
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ctx.RegisterFunc(arg.name, f, 0, -1)
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} else {
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err = fmt.Errorf("invalid function specification: %q", arg.name)
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}
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} else if integer, ok := anyInteger(arg.value); ok {
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ctx.SetValue(arg.name, integer)
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} else if float, ok := anyFloat(arg.value); ok {
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ctx.SetValue(arg.name, float)
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} else if _, ok := arg.value.(string); ok {
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ctx.SetValue(arg.name, arg.value)
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} else if _, ok := arg.value.(bool); ok {
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ctx.SetValue(arg.name, arg.value)
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} else {
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err = fmt.Errorf("unsupported type %T specified for item %q", arg.value, arg.name)
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}
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}
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if err == nil {
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result, err = EvalString(ctx, source)
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}
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return
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}
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