92 lines
2.1 KiB
Go
92 lines
2.1 KiB
Go
package main
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import (
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"context"
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"fmt"
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"log"
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"go.neonxp.dev/lexpr"
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)
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func main() {
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ctx := context.Background()
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l := lexpr.New(lexpr.WithDefaults())
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// Simple math
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result1 := <-l.Eval(ctx, `2 + 2 * 2`)
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log.Println("Result 1:", result1.Value)
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// Helper for one result
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result2, err := l.OneResult(ctx, `len("test") + 10`)
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if err != nil {
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log.Fatal(err)
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}
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log.Println("Result 2:", result2)
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// Custom functions
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l.SetFunction("add", func(ts *lexpr.TokenStack) error {
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a, okA := ts.Pop().Number() // first func argument
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b, okB := ts.Pop().Number() // second func argument
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if !okA || !okB {
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return fmt.Errorf("Both args must be number")
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}
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ts.Push(lexpr.TokenFromInt(a + b))
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return nil
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})
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result3, err := l.OneResult(ctx, `add(12, 24) * 2`)
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if err != nil {
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log.Fatal(err)
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}
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log.Println("Result 3:", result3)
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// JSON extraction via dots and variables
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jsonString := `{
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"rootKey1": "value1",
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"rootKey2": {
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"childKey1": "value2",
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"childKey2": "value3"
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},
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"arrayKey": [
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"array value 1",
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"array value 2",
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"array value 3",
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"array value 4"
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]
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}`
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key1name := "rootKey1"
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l.SetVariable("jsonData", jsonString)
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l.SetVariable("key1name", key1name)
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result41, err := l.OneResult(ctx, `jsonData.key1name`) // = value1
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if err != nil {
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log.Fatal(err)
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}
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log.Println("Result 4-1:", result41)
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result42, err := l.OneResult(ctx, `jsonData.rootKey2.childKey2`) // = value3
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if err != nil {
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log.Fatal(err)
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}
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log.Println("Result 4-2:", result42)
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result43, err := l.OneResult(ctx, `jsonData.arrayKey.3`) // = array value 4
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if err != nil {
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log.Fatal(err)
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}
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log.Println("Result 4-3:", result43)
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// Logic expressions
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result51, err := l.OneResult(ctx, `jsonData.key1name == "value1"`) // = 1
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if err != nil {
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log.Fatal(err)
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}
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log.Println("Result 5-1:", result51)
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result52, err := l.OneResult(ctx, `10 >= 5 || 10 <= 5`) // = 1
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if err != nil {
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log.Fatal(err)
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}
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log.Println("Result 5-2:", result52)
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result53, err := l.OneResult(ctx, `10 >= 5 && 10 <= 5`) // = 0
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if err != nil {
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log.Fatal(err)
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}
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log.Println("Result 5-3:", result53)
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}
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