File: 01_basic.js

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// Generated by re2js
// re2js $INPUT -o $OUTPUT

function lex(yyinput) {
    let yycursor = 0;
    
{
    let yych = 0
    let yystate = 0
    yyl: while (true) {
        switch (yystate) {
            case 0:
                yych = yyinput.charCodeAt(yycursor)
                yycursor += 1;
                switch (yych) {
                    case 0x31:
                    case 0x32:
                    case 0x33:
                    case 0x34:
                    case 0x35:
                    case 0x36:
                    case 0x37:
                    case 0x38:
                    case 0x39:
                        yystate = 2
                        continue yyl
                    default:
                        yystate = 1
                        continue yyl
                }
            case 1:
                { return false; }
            case 2:
                yych = yyinput.charCodeAt(yycursor)
                switch (yych) {
                    case 0x30:
                    case 0x31:
                    case 0x32:
                    case 0x33:
                    case 0x34:
                    case 0x35:
                    case 0x36:
                    case 0x37:
                    case 0x38:
                    case 0x39:
                        yycursor += 1;
                        yystate = 2
                        continue yyl
                    default:
                        yystate = 3
                        continue yyl
                }
            case 3:
                { return true; }
            default:
                throw "internal lexer error"
        }
    }
}

}

if (!lex("1234\0")) {
    throw "error!"
}