Magpie语法解析器

Magpie语法解析器

Magpie是一个用go语言写的语法解析器，支持class, linq, sql, net, http, fmt, json等。还包含一个实时语法高亮的REPL。

例子

class Linq {
    static fn TestSimpleLinq() {
        //Prepare Data Source
        let ingredients = [
            {Name: "Sugar",  Calories: 500},
            {Name: "Egg",    Calories: 100},
            {Name: "Milk",   Calories: 150},
            {Name: "Flour",  Calories: 50},
            {Name: "Butter", Calories: 200},
        ]

    //Query Data Source
        ingredient = from i in ingredients where i.Calories >= 150 orderby i.Name select i

        //Display
        for item in ingredient => println(item)
    }

    static fn TestFileLinq() {
        //Read Data Source from file.
        file = newFile("./examples/linqSample.csv", "r")

        //Query Data Source
        result = from field in file where int(field[1]) > 300000 select field[0]

        //Display
        for item in result => printf("item = %s\n", item)

        file.close()
    }

    static fn TestComplexLinq() {
        //Data Source
        stringList = [
            "A penny saved is a penny earned.",
            "The early bird catches the worm.",
            "The pen is mightier than the sword." 
        ]

        //Query Data Source
        earlyBirdQuery =
            from sentence in stringList
            let words = sentence.split(" ")
            from word in words
            let w = word.lower()
            where w[0] == "a" || w[0] == "e" ||
                  w[0] == "i" || w[0] == "o" ||
                  w[0] == "u"
            select word

        //Display
        for v in earlyBirdQuery => printf("'%s' starts with a vowel\n", v)
    }
}

Linq.TestSimpleLinq()
println("======================================")
Linq.TestFileLinq()
println("======================================")
Linq.TestComplexLinq()