example-statement-parser

An statement parser with participle.

Install

go get github.com/dsxack/example-statement-parser

Usage example

package main
import (
"fmt""log""reflect""github.com/dsxack/example-statement-parser"
)
funcExample() {
stmt:= parser.Statement{}
err:=parser.Parse(`#{ ${insecure} ? "http" : "https" }://${domain}/${basepath}`, &stmt)
iferr!=nil {
log.Fatal(err)
}
stringP:=func(valuestring) *string { return&value }
result:=reflect.DeepEqual(stmt, parser.Statement{
Fragments: []parser.Fragment{
{IfStatement: &parser.IfStatement{
Cond: parser.Expr{Left: &parser.Cond{Left: parser.Term{Variable: stringP("insecure")}}},
Then: parser.Term{Value: &parser.Value{String: stringP("http")}},
Else: parser.Term{Value: &parser.Value{String: stringP("https")}},
}},
{Literal: stringP("://")},
{Variable: stringP("domain")},
{Literal: stringP("/")},
{Variable: stringP("basepath")},
},
})
fmt.Println(result)
// output: true
}

Example of statements

• some value 5"
• ${some.variable}"
• #{ true ? "yes" : "no" }
• #{ ${insecure} ? ${var1} : ${var2} }
• #{ true ? true : false }
• #{ 5 ? 10 : 0 }
• #{ ${cond1} or ${cond2} ? ${var1} : ${var2} }
• #{ ${cond1} || ${cond2} ? ${var1} : ${var2} }
• #{ ${cond1} and ${cond2} ? ${var1} : ${var2} }
• #{ ${cond1} && ${cond2} ? ${var1} : ${var2} }
• #{ ${foo} == "bar" ? ${var1} : ${var2} }
• #{ (${cond1} or ${cond2}) and ${cond3} ? ${var1} : ${var2} }
• #{ ${cond1} and (${cond2} or ${cond3}) ? ${var1} : ${var2} }
• #{ ${cond1} and (${cond2} > 5 or ${cond3}) ? ${var1} : ${var2} }
• #{ ${insecure} ? "http" : "https" }://${domain}/${basepath}

Parser railway diagram