MMQLEngine/mmql/statements/actions/buy.go

package actions

import (
    engine "github.com/tgckpg/mmqlengine/mmql/engine"
    stmtd "github.com/tgckpg/mmqlengine/mmql/statements"
)

/*
EXPECT: BUY
THEN EXPECT: [AmountStatement] OF [ProductStatement]
THEN EXPECT: FOR [AmountStatement]
THEN EXPECT: FROM [ExchangeType]
THEN OPT EXPECT: [ExchangeType]
THEN OPT EXPECT: [AND|OR]
    THEN EXPECT: [ActionExpression]
THEN OPT EXPECT: FOR EVERY
    THEN EXPECT: [AmountType] OF [ProductType]
    THEN EXPECT: [SOLD|BOUGHT] FROM [ExchangeType]
*/

func BuyStatement( lexer *engine.Lexer ) ( istmt stmtd.IStatement, err error ) {
    orderStmt := stmtd.OrderStatement{}
    orderStmt.Action = "BUY"

    // AmountStatement
    readAmount := engine.LexerExpect{
        Statements: true,
        Keywords: false,
        Brackets: false,
        Quotes: false,
        Key: "AMOUNT",
    }

    amountStmt, err := lexer.ReadStatement( &readAmount )
    if err != nil {
        return
    }
    orderStmt.For( amountStmt )

    // OF
    err = lexer.ReadKeyword( "OF" )
    if err != nil {
        return
    }

    // ProductStatement
    readProduct := engine.LexerExpect{
        Statements: true,
        Keywords: false,
        Brackets: false,
        Quotes: false,
        Key: "PRODUCT",
    }
    productStmt, err := lexer.ReadStatement( &readProduct )
    if err != nil {
        return
    }
    orderStmt.Product( productStmt )

    istmt = orderStmt
    return
}