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lr1parser's Introduction

What's this?

LR(1)構文解析器の生成および、構文解析を実行するC#ライブラリです

How to use

Testフォルダ内のサンプルプログラムを参照

Excuse

興味本位、勉強目的で書いてみたものなので、厳密なテストはしていません
誤った構文解析結果が出力される可能性があります
また、パフォーマンスも度外視しています

Sample

入力文法例

Equation -> Add | Mult
Add -> AddLeft AddSymbol AddRight
AddLeft -> 1 | Add | Mult
AddSymbol -> + | -
AddRight -> 1 | Mult
Mult -> MultLeft MultSymbol MultRight
MultLeft -> 1 | Mult
MultSymbol -> * | /
MultRight -> 1

構文解析結果例

[入力文字列]
1 * 1 - 1 + 1 / 1

[解析結果(1行表示)]
Equation(Add(AddLeft(Add(AddLeft(Mult(MultLeft(1) MultSymbol(*) MultRight(1))) AddSymbol(-) AddRight(1))) AddSymbol(+) AddRight(Mult(MultLeft(1) MultSymbol(/) MultRight(1)))))

[解析結果(シンプル)]
(((1 * 1) - 1) + (1 / 1))

[解析結果(階層表示)]
Equation
`-- Add
    |-- AddLeft
    |   `-- Add
    |       |-- AddLeft
    |       |   `-- Mult
    |       |       |-- MultLeft
    |       |       |   `-- 1
    |       |       |-- MultSymbol
    |       |       |   `-- *
    |       |       `-- MultRight
    |       |           `-- 1
    |       |-- AddSymbol
    |       |   `-- -
    |       `-- AddRight
    |           `-- 1
    |-- AddSymbol
    |   `-- +
    `-- AddRight
        `-- Mult
            |-- MultLeft
            |   `-- 1
            |-- MultSymbol
            |   `-- /
            `-- MultRight
                `-- 1

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