64 lines
1.7 KiB
Go
64 lines
1.7 KiB
Go
package natspec
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import (
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"fmt"
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"github.com/obscuren/otto"
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)
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type NatSpec struct {
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jsvm *otto.Otto
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}
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// TODO: should initialise with abi and userdoc jsons
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func New() (self *NatSpec, err error) {
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self = new(NatSpec)
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self.jsvm = otto.New()
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_, err = self.jsvm.Run(natspecJS)
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if err != nil {
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return
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}
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_, err = self.jsvm.Run("var natspec = require('natspec');")
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if err != nil {
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return
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}
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return
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}
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func (self *NatSpec) Notice(transaction, abi, method, expression string) (string, error) {
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var err error
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if _, err = self.jsvm.Run("var transaction = " + transaction + ";"); err != nil {
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return "", fmt.Errorf("natspec.js error setting transaction: %v", err)
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}
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if _, err = self.jsvm.Run("var abi = " + abi + ";"); err != nil {
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return "", fmt.Errorf("natspec.js error setting abi: %v", err)
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}
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if _, err = self.jsvm.Run("var method = '" + method + "';"); err != nil {
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return "", fmt.Errorf("natspec.js error setting method: %v", err)
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}
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if _, err = self.jsvm.Run("var expression = \"" + expression + "\";"); err != nil {
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return "", fmt.Errorf("natspec.js error setting expression: %v", err)
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}
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self.jsvm.Run("var call = {method: method,abi: abi,transaction: transaction};")
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value, err := self.jsvm.Run("natspec.evaluateExpression(expression, call);")
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if err != nil {
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return "", fmt.Errorf("natspec.js error evaluating expression: %v", err)
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}
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evalError := "Natspec evaluation failed, wrong input params"
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if value.String() == evalError {
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return "", fmt.Errorf("natspec.js error evaluating expression: wrong input params in expression '%s'", expression)
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}
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if len(value.String()) == 0 {
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return "", fmt.Errorf("natspec.js error evaluating expression")
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}
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return value.String(), nil
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}
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