├── .gitignore ├── CONTRIBUTING.md ├── LICENSE ├── Makefile ├── README.md ├── TODO.md ├── docs └── installation.md ├── dune-project └── src ├── README.md ├── data_engine.ml ├── db_engine.ml ├── dune ├── http_engine.ml ├── io_engine.ml ├── lexer.mll ├── main.ml └── parser.mly /.gitignore: -------------------------------------------------------------------------------- 1 | sql 2 | test 3 | _build/ 4 | .vscode/ -------------------------------------------------------------------------------- /CONTRIBUTING.md: -------------------------------------------------------------------------------- 1 | # Contributing to sqlc 2 | 3 | Thank you for your interest in contributing to sqlc! We welcome contributions from the community to help improve our project. 4 | 5 | ## Getting Started 6 | 7 | To get started with contributing, please follow these steps: 8 | 9 | 1. Fork the repository. 10 | 2. Clone the forked repository to your local machine. 11 | 3. Create a new branch for your changes. 12 | 4. Make your desired changes to the codebase. 13 | 5. Test your changes thoroughly. 14 | 6. Commit your changes with descriptive commit messages. 15 | 7. Push your changes to your forked repository. 16 | 8. Submit a pull request to the main repository. 17 | 18 | ## Code Style 19 | 20 | We follow a specific code style in our project. Please make sure to adhere to the following guidelines: 21 | 22 | - Use consistent indentation (spaces or tabs). 23 | - Follow naming conventions for variables, functions, and classes. 24 | - Write clear and concise comments. 25 | - Keep lines of code within a reasonable length. 26 | 27 | ## Reporting Issues 28 | 29 | If you encounter any issues or have suggestions for improvement, please open an issue in the issue tracker. Provide as much detail as possible to help us understand and reproduce the problem. 30 | 31 | ## Contact 32 | 33 | If you have any questions or need further assistance, feel free to reach out to us at [xeonds@stu.xidian.edu.cn]. 34 | 35 | We appreciate your contributions and look forward to working with you! -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | # GNU GENERAL PUBLIC LICENSE 2 | 3 | Version 3, 29 June 2007 4 | 5 | Copyright (C) 2007 Free Software Foundation, Inc. 6 | 7 | 8 | Everyone is permitted to copy and distribute verbatim copies of this 9 | license document, but changing it is not allowed. 10 | 11 | ## Preamble 12 | 13 | The GNU General Public License is a free, copyleft license for 14 | software and other kinds of works. 15 | 16 | The licenses for most software and other practical works are designed 17 | to take away your freedom to share and change the works. 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EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT 590 | HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT 591 | WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT 592 | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 593 | A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND 594 | PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE 595 | DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR 596 | CORRECTION. 597 | 598 | ### 16. Limitation of Liability. 599 | 600 | IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 601 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR 602 | CONVEYS THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, 603 | INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES 604 | ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT 605 | NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR 606 | LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM 607 | TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER 608 | PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. 609 | 610 | ### 17. Interpretation of Sections 15 and 16. 611 | 612 | If the disclaimer of warranty and limitation of liability provided 613 | above cannot be given local legal effect according to their terms, 614 | reviewing courts shall apply local law that most closely approximates 615 | an absolute waiver of all civil liability in connection with the 616 | Program, unless a warranty or assumption of liability accompanies a 617 | copy of the Program in return for a fee. 618 | 619 | END OF TERMS AND CONDITIONS 620 | 621 | ## How to Apply These Terms to Your New Programs 622 | 623 | If you develop a new program, and you want it to be of the greatest 624 | possible use to the public, the best way to achieve this is to make it 625 | free software which everyone can redistribute and change under these 626 | terms. 627 | 628 | To do so, attach the following notices to the program. It is safest to 629 | attach them to the start of each source file to most effectively state 630 | the exclusion of warranty; and each file should have at least the 631 | "copyright" line and a pointer to where the full notice is found. 632 | 633 | 634 | Copyright (C) 635 | 636 | This program is free software: you can redistribute it and/or modify 637 | it under the terms of the GNU General Public License as published by 638 | the Free Software Foundation, either version 3 of the License, or 639 | (at your option) any later version. 640 | 641 | This program is distributed in the hope that it will be useful, 642 | but WITHOUT ANY WARRANTY; without even the implied warranty of 643 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 644 | GNU General Public License for more details. 645 | 646 | You should have received a copy of the GNU General Public License 647 | along with this program. If not, see . 648 | 649 | Also add information on how to contact you by electronic and paper 650 | mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands \`show w' and \`show c' should show the 661 | appropriate parts of the General Public License. Of course, your 662 | program's commands might be different; for a GUI interface, you would 663 | use an "about box". 664 | 665 | You should also get your employer (if you work as a programmer) or 666 | school, if any, to sign a "copyright disclaimer" for the program, if 667 | necessary. For more information on this, and how to apply and follow 668 | the GNU GPL, see . 669 | 670 | The GNU General Public License does not permit incorporating your 671 | program into proprietary programs. If your program is a subroutine 672 | library, you may consider it more useful to permit linking proprietary 673 | applications with the library. If this is what you want to do, use the 674 | GNU Lesser General Public License instead of this License. But first, 675 | please read . 676 | -------------------------------------------------------------------------------- /Makefile: -------------------------------------------------------------------------------- 1 | all: 2 | dune build 3 | 4 | run: 5 | dune exec sql 6 | 7 | clean: 8 | rm -rf _build 9 | rm -rf release 10 | 11 | dist: 12 | dune install --prefix=release 13 | tar -zcvf sqlc.tar.gz release -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # sqlc 2 | 3 | > [!WARNING] 4 | > THIS PROJECT IS EXPIRIMENTAL AND SHOULD NOT BE USED IN PRODUCTION 5 | 6 | sqlc is a basic SQL statement parser and executor written in OCaml. It provides a simple and efficient way to parse and execute SQL statements. 7 | 8 | It uses csv files as tables, and directories as databases. 9 | 10 | ## Features 11 | 12 | - **SQL Parsing**: sqlc can parse a simple range of SQL statements, including SELECT, INSERT, UPDATE, DELETE, and more. 13 | - **Query Execution**: sqlc provides a basic query execution engine that can execute SQL statements against a database. 14 | 15 | ### Supported Statements 16 | 17 | sqlc currently supports the following SQL statements: 18 | 19 | - `SELECT column1, column2, ... FROM IDENTIFIER [ WHERE condition ];` 20 | - `CREATE DATABASE IDENTIFIER;` 21 | - `USE DATABASE IDENTIFIER;` 22 | - `CREATE TABLE IDENTIFIER ( table_columns );` 23 | - `SHOW TABLES;` 24 | - `SHOW DATABASES;` 25 | - `INSERT INTO IDENTIFIER ( column1, column2, ... ) VALUES ( value1, value2, ... ) [ ( value1, value2, ... ) ... ];` 26 | - `UPDATE IDENTIFIER SET IDENTIFIER EQUALS value [ WHERE condition ];` 27 | - `DELETE FROM IDENTIFIER [ WHERE condition ];` 28 | - `DROP TABLE IDENTIFIER;` 29 | - `DROP DATABASE IDENTIFIER;` 30 | - `EXIT;` 31 | 32 | The condition is a simple expression that can include logical operators (`AND`, `OR`, `NOT`), comparison operators (`=`, `<>`, `>`, `<`, `>=`, `<=`), and parentheses. 33 | 34 | ## Getting Started 35 | 36 | To get started with sqlc, follow these steps: 37 | 38 | 1. Install OCaml on your system. 39 | 2. Clone the sqlc repository. 40 | 3. Build the project using the provided build script. 41 | 4. Start using sqlc. 42 | 43 | Or download from the release page. 44 | 45 | For more detailed instructions, please refer to the [Installation Guide](./docs/installation.md) in the project documentation. 46 | 47 | ## Contributing 48 | 49 | Contributions to sqlc are welcome! If you would like to contribute, please follow the guidelines outlined in the [Contributing Guide](./CONTRIBUTING.md). 50 | 51 | ## License 52 | 53 | sqlc is licensed under the GNU General Public License v3.0. For more information, please refer to the [LICENSE](./LICENSE) file. 54 | -------------------------------------------------------------------------------- /TODO.md: -------------------------------------------------------------------------------- 1 | - [x]支持INSERT后跟随多个VALUES 2 | - [x]插入类型验证 3 | - [ ]交互tab补全&方向键移动+历史命令 4 | - [ ]多行sql语句 5 | - [ ]注释 6 | - [x]无头模式执行sql文件 7 | - [ ]多表join查询 8 | - [ ]索引功能 9 | - [ ]视图功能 10 | - [ ]提供用于web后端能力的标准库 11 | - [ ]文件i/o 12 | - [ ]http api库 13 | - [ ]json序列化/反序列化支持 14 | - [ ]yaml配置解析 15 | - [ ]more modern sql with variables & http server & io support & more -------------------------------------------------------------------------------- /docs/installation.md: -------------------------------------------------------------------------------- 1 | # Installation 2 | 3 | ## Binary Installation 4 | 5 | You can download the pre-built binary from the GitHub releases page. 6 | 7 | ## Source Code Installation 8 | 9 | To install from source code, follow these steps: 10 | 11 | Ensure the following dependencies are installed on your system: 12 | 13 | - OCaml 5.0 or later 14 | - OPAM 2.0 or later 15 | - GNU Make 4.0 or later 16 | 17 | 1. Clone the repository from GitHub using the command `git clone https://github.com/xeonds/sqlc` 18 | 2. Navigate to the cloned repository directory using the command `cd sqlc` 19 | 3. Run the command `make sql` to compile the SQL parser. 20 | 21 | Once the build is complete, you can see the compiled binary at `./sql`. 22 | 23 | ## System Requirements 24 | 25 | Before installing the software, make sure your system meets the following requirements: 26 | 27 | - Operating System: Windows 10, macOS 10.14 or later, or Linux (Ubuntu 20.04 or later) 28 | - Processor: Intel Core i5 or equivalent 29 | - Memory: 512MB RAM 30 | - Storage: 256MB of free disk space 31 | 32 | ## Troubleshooting 33 | 34 | If you encounter any issues during the software running process, please check the following: 35 | 36 | - Ensure that all dependencies are installed correctly. 37 | - Verify that the software is compatible with your operating system. 38 | - Check the system logs for any error messages that may indicate the cause of the issue. 39 | 40 | If the issue persists, please open an issue on the GitHub repository and provide as much information as possible to help us resolve the problem. 41 | -------------------------------------------------------------------------------- /dune-project: -------------------------------------------------------------------------------- 1 | (lang dune 3.16) 2 | 3 | (name sqlc) 4 | 5 | (source 6 | (github xeonds/sqlc)) 7 | 8 | (authors "xeonds") 9 | 10 | (maintainers "Maintainer Name") 11 | 12 | (license GPL-3.0) 13 | 14 | (documentation https://github.com/xeonds/sqlc) 15 | 16 | (package 17 | (name sqlc) 18 | (synopsis "A SQL compiler") 19 | (description "A SQL compiler") 20 | (depends ocaml dune csv angstrom) 21 | (tags 22 | (topics sql))) 23 | -------------------------------------------------------------------------------- /src/README.md: -------------------------------------------------------------------------------- 1 | # sqlc 2 | 3 | ## http_engine 4 | 5 | provide stdlib for: 6 | 7 | - request path & type mapper 8 | - request handler with sql-ex lang 9 | - json support 10 | 11 | the http-lib should run at backend, when executed the part, just open a thread at backend to handle requests, until the main process(repl engine or executor process) exited. 12 | 13 | and it will show logs to stdout when handle request, and can be set to be silent. 14 | 15 | also, support interactions with other stdlib components, like run sql from http content using db_engine, 16 | storage content to filesystem, and string process using io_engine, data manipulation using data_engine, etc. 17 | 18 | ## db_engine 19 | 20 | provides stdlib for: 21 | 22 | - sql engine for csv database operation 23 | 24 | this part is standard sql database support, supporting acid actions and some dbms features 25 | 26 | now I'm planning support higher query process like join, groupby, etc., and core features 27 | like transactions, views, permission control. 28 | 29 | ## io_engine 30 | 31 | provides stdlib for: 32 | 33 | - file i/o of system 34 | - string process lib 35 | 36 | support file i/o, string process, and auto-serialize of data types. user can serialize data to 37 | 38 | ## data_engine 39 | 40 | provides stdlib for: 41 | 42 | - array operations 43 | - basic data types 44 | - user-defined compose data types 45 | 46 | ## main 47 | 48 | entrance of program, supports interactive mode or headless mode(read command from file) 49 | 50 | ## ast 51 | 52 | language statements & expressions & data types defination 53 | 54 | ## parser&lexer 55 | 56 | language words & language statements parser 57 | -------------------------------------------------------------------------------- /src/data_engine.ml: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/xeonds/sqlc/90ba3df2f14c31edd1a8888adb76e81b3384961b/src/data_engine.ml -------------------------------------------------------------------------------- /src/db_engine.ml: -------------------------------------------------------------------------------- 1 | module Types = struct 2 | type dtype = String | Int | Bool | Float 3 | type value = VString of string | VInt of int | VBool of bool | VFloat of float 4 | 5 | let cast_value dtype value = 6 | match dtype with 7 | | String -> VString value 8 | | Int -> VInt (int_of_string value) 9 | | Bool -> VBool (bool_of_string value) 10 | | Float -> VFloat (float_of_string value) 11 | 12 | let cast_type = function 13 | | String -> "string" 14 | | Int -> "int" 15 | | Bool -> "bool" 16 | | Float -> "float" 17 | 18 | let type_of_string = function 19 | | "string" -> String 20 | | "int" -> Int 21 | | "bool" -> Bool 22 | | "float" -> Float 23 | | _ -> failwith "Invalid type" 24 | 25 | let string_of_value = function 26 | | VString s -> s 27 | | VInt i -> string_of_int i 28 | | VBool b -> string_of_bool b 29 | | VFloat f -> string_of_float f 30 | 31 | let default_value = function 32 | | String -> VString "" 33 | | Int -> VInt 0 34 | | Bool -> VBool false 35 | | Float -> VFloat 0.0 36 | 37 | type field_spec = { 38 | name : string; 39 | dtype : dtype; 40 | } 41 | 42 | type table = { 43 | schema : field_spec list; 44 | mutable data : value list list; 45 | path : string; 46 | } 47 | 48 | type expr = 49 | | Literal of value 50 | | Column of string 51 | | BinOp of expr * string * expr 52 | | Call of string * expr list 53 | 54 | type statement = 55 | | Select of string list * string * (string * expr) option * expr option 56 | | CreateTable of string * (string * dtype) list 57 | | InsertInto of string * string list * value list list 58 | | Update of string * string * value * expr option 59 | | DeleteFrom of string * expr option 60 | | ShowTables 61 | | DropTable of string 62 | | LoadObject of expr 63 | | StoreObject of expr 64 | | Exit 65 | 66 | type eval = 67 | | Select of string list * table * expr option 68 | | Join of table * table * expr 69 | | CreateTable of string * (string * dtype) list 70 | | InsertInto of table * string list * value list list 71 | | Update of table * string * value * expr option 72 | | DeleteFrom of table * expr option 73 | | ShowTables 74 | | DropTable of string 75 | | LoadObject of expr 76 | | StoreObject of expr 77 | | Exit 78 | 79 | let string_of_table tbl = 80 | let header = List.map (fun f -> f.name ^ ":" ^ cast_type f.dtype) tbl.schema |> String.concat "," in 81 | let rows = List.map (fun row -> 82 | List.map string_of_value row |> String.concat "," 83 | ) tbl.data |> String.concat "\n" in 84 | header ^ "\n" ^ rows 85 | end 86 | 87 | module Database = struct 88 | open Types 89 | 90 | let init_db db_name = 91 | if Sys.file_exists db_name then 92 | failwith "Database already exists" 93 | else 94 | Unix.mkdir db_name 0o777 95 | 96 | let load_table path = 97 | let ic = open_in path in 98 | let schema = 99 | input_line ic 100 | |> String.split_on_char ',' 101 | |> List.map (fun s -> 102 | match String.split_on_char ':' s with 103 | | [name; "string"] -> {name; dtype=String} 104 | | [name; "int"] -> {name; dtype=Int} 105 | | [name; "bool"] -> {name; dtype=Bool} 106 | | [name; "float"] -> {name; dtype=Float} 107 | | _ -> failwith "Invalid header format") 108 | in 109 | let data = 110 | let rec read_lines acc = 111 | try 112 | let line = input_line ic |> String.split_on_char ',' in 113 | let row = List.map2 (fun f v -> cast_value f.dtype v) schema line in 114 | read_lines (row::acc) 115 | with End_of_file -> List.rev acc 116 | in 117 | read_lines [] 118 | in 119 | close_in ic; 120 | {schema; data; path} 121 | 122 | let save_table tbl = 123 | let oc = open_out tbl.path in 124 | let schema_str = List.map (fun f -> f.name ^ ":" ^ cast_type f.dtype) tbl.schema |> String.concat "," in 125 | output_string oc (schema_str ^ "\n"); 126 | List.iter (fun row -> 127 | let line = List.map (function 128 | | VString s -> s 129 | | VInt i -> string_of_int i 130 | | VBool b -> string_of_bool b 131 | | VFloat f -> string_of_float f) 132 | row 133 | |> String.concat "," 134 | in 135 | output_string oc (line ^ "\n") 136 | ) tbl.data; 137 | close_out oc 138 | 139 | (* append new line in memory *) 140 | (* need manual writeback *) 141 | let append_row tbl (row: value list) = 142 | if List.length row <> List.length tbl.schema then 143 | failwith "Row length does not match table schema" 144 | else 145 | (* check if each item's type in row matches the corresponding position's tbl.scheme's type *) 146 | List.iter2 (fun f v -> 147 | match f.dtype, v with 148 | | String, VString _ | Int, VInt _ | Bool, VBool _ | Float, VFloat _ -> () 149 | | _ -> failwith "Type mismatch") tbl.schema row; 150 | tbl.data <- row::tbl.data 151 | end 152 | 153 | module ObjectStorage = struct 154 | let hash_content data = 155 | Digest.string data |> Digest.to_hex 156 | 157 | (* hash filename & storage it to folder *) 158 | let store_file ~user_dir filename content = 159 | let hash_name = hash_content filename in 160 | let object_path = Filename.concat user_dir hash_name in 161 | let oc = open_out_bin object_path in 162 | output_string oc content; 163 | close_out oc; 164 | hash_name 165 | 166 | let retrieve_file ~user_dir hash = 167 | let path = Filename.concat user_dir hash in 168 | if Sys.file_exists path then 169 | let ic = open_in_bin path in 170 | let content = really_input_string ic (in_channel_length ic) in 171 | close_in ic; 172 | Some content 173 | else None 174 | end 175 | 176 | module Engine = struct 177 | open Types 178 | 179 | (* expr evaluate *) 180 | let eval_cond cond row field_specs = 181 | let rec eval_expr = function 182 | | Literal v -> v 183 | | Column name -> List.assoc name (List.combine (List.map (fun f -> f.name) field_specs) row) 184 | | BinOp (e1, op, e2) -> ( 185 | let v1 = eval_expr e1 in 186 | let v2 = eval_expr e2 in 187 | match op with 188 | | "+" -> (match v1, v2 with 189 | | VInt i1, VInt i2 -> VInt (i1 + i2) 190 | | VFloat f1, VFloat f2 -> VFloat (f1 +. f2) 191 | | _ -> failwith "Type mismatch") 192 | | "-" -> (match v1, v2 with 193 | | VInt i1, VInt i2 -> VInt (i1 - i2) 194 | | VFloat f1, VFloat f2 -> VFloat (f1 -. f2) 195 | | _ -> failwith "Type mismatch") 196 | | "*" -> (match v1, v2 with 197 | | VInt i1, VInt i2 -> VInt (i1 * i2) 198 | | VFloat f1, VFloat f2 -> VFloat (f1 *. f2) 199 | | _ -> failwith "Type mismatch") 200 | | "/" -> (match v1, v2 with 201 | | VInt i1, VInt i2 -> VInt (i1 / i2) 202 | | VFloat f1, VFloat f2 -> VFloat (f1 /. f2) 203 | | _ -> failwith "Type mismatch") 204 | | "%" -> (match v1, v2 with 205 | | VInt i1, VInt i2 -> VInt (i1 mod i2) 206 | | _ -> failwith "Type mismatch") 207 | | "=" -> (match v1, v2 with 208 | | VInt i1, VInt i2 -> VBool (i1 = i2) 209 | | VFloat f1, VFloat f2 -> VBool (f1 = f2) 210 | | VBool b1, VBool b2 -> VBool (b1 = b2) 211 | | VString s1, VString s2 -> VBool (s1 = s2) 212 | | _ -> failwith "Type mismatch") 213 | | "<" -> (match v1, v2 with 214 | | VInt i1, VInt i2 -> VBool (i1 < i2) 215 | | VFloat f1, VFloat f2 -> VBool (f1 < f2) 216 | | _ -> failwith "Type mismatch") 217 | | ">" -> (match v1, v2 with 218 | | VInt i1, VInt i2 -> VBool (i1 > i2) 219 | | VFloat f1, VFloat f2 -> VBool (f1 > f2) 220 | | _ -> failwith "Type mismatch") 221 | | "<=" -> (match v1, v2 with 222 | | VInt i1, VInt i2 -> VBool (i1 <= i2) 223 | | VFloat f1, VFloat f2 -> VBool (f1 <= f2) 224 | | _ -> failwith "Type mismatch") 225 | | ">=" -> (match v1, v2 with 226 | | VInt i1, VInt i2 -> VBool (i1 >= i2) 227 | | VFloat f1, VFloat f2 -> VBool (f1 >= f2) 228 | | _ -> failwith "Type mismatch") 229 | | "<>" | "!=" -> (match v1, v2 with 230 | | VInt i1, VInt i2 -> VBool (i1 <> i2) 231 | | VFloat f1, VFloat f2 -> VBool (f1 <> f2) 232 | | VBool b1, VBool b2 -> VBool (b1 <> b2) 233 | | VString s1, VString s2 -> VBool (s1 <> s2) 234 | | _ -> failwith "Type mismatch") 235 | | "AND" -> (match v1, v2 with 236 | | VBool b1, VBool b2 -> VBool (b1 && b2) 237 | | _ -> failwith "Type mismatch") 238 | | "OR" -> (match v1, v2 with 239 | | VBool b1, VBool b2 -> VBool (b1 || b2) 240 | | _ -> failwith "Type mismatch") 241 | | _ -> failwith "Unsupported operator") 242 | | Call (name, args) -> ( 243 | match name with 244 | | "if" -> (match args with 245 | | [cond; e1; e2] -> (match eval_expr cond with 246 | | VBool true -> eval_expr e1 247 | | VBool false -> eval_expr e2 248 | | _ -> failwith "Type mismatch") 249 | | _ -> failwith "Invalid number of arguments") 250 | | "not" -> (match args with 251 | | [e] -> (match eval_expr e with 252 | | VBool b -> VBool (not b) 253 | | _ -> failwith "Type mismatch") 254 | | _ -> failwith "Invalid number of arguments") 255 | | _ -> failwith "Unsupported function") 256 | in 257 | eval_expr cond |> function 258 | | VBool b -> b 259 | | _ -> failwith "Type mismatch" 260 | 261 | (** 执行查询语句返回结果表 *) 262 | let execute = function 263 | | Select (cols, table, where) -> 264 | let rows = match where with 265 | | None -> table.data 266 | | Some cond -> List.filter (fun row -> eval_cond cond row table.schema) table.data in 267 | let filtered = 268 | if List.mem "*" cols then rows 269 | else 270 | List.map (fun row -> List.map (fun col -> List.assoc col (List.combine (List.map (fun f -> f.name) table.schema) row)) cols) rows in 271 | {table with data=filtered} 272 | | Join (left, right, on) -> 273 | let left_col, right_col = match on with 274 | | BinOp (Column c, "=", Column c') when List.mem c (List.map (fun f -> f.name) left.schema) && List.mem c' (List.map (fun f -> f.name) right.schema) -> c, c' 275 | | _ -> failwith "Invalid join condition" in 276 | let left_index = List.assoc left_col (List.mapi (fun i f -> (f.name, i)) left.schema) in 277 | let right_index = List.assoc right_col (List.mapi (fun i f -> (f.name, i)) right.schema) in 278 | let right_map = List.fold_left (fun acc row -> 279 | let key = List.nth row right_index in 280 | let values = try List.assoc key acc with Not_found -> [] in 281 | (key, row :: values) :: List.remove_assoc key acc) [] right.data in 282 | let joined = List.fold_left (fun acc row1 -> 283 | let key = List.nth row1 left_index in 284 | match List.assoc_opt key right_map with 285 | | Some rows2 -> List.rev_append (List.map (fun row2 -> row1 @ row2) rows2) acc 286 | | None -> acc) [] left.data in 287 | {schema=left.schema @ right.schema; data=List.rev joined; path = ""} 288 | | CreateTable (name, cols) -> 289 | let table_path = name ^ ".csv" in 290 | if Sys.file_exists table_path then 291 | failwith "Table already exists" 292 | else 293 | let schema = List.map (fun (name, dtype) -> {name; dtype}) cols in 294 | let tbl = {schema; data=[]; path=table_path} in 295 | Database.save_table tbl; 296 | tbl 297 | | ShowTables -> 298 | let rec print_tree path prefix = 299 | let entries = Sys.readdir path |> Array.to_list |> List.sort String.compare in 300 | List.iteri (fun i entry -> 301 | let is_last = i = List.length entries - 1 in 302 | let new_prefix = prefix ^ (if is_last then "└── " else "├── ") in 303 | let full_path = Filename.concat path entry in 304 | if Sys.is_directory full_path then begin 305 | Printf.printf "%s%s/\n" new_prefix entry; 306 | print_tree full_path (prefix ^ (if is_last then " " else "│ ")) 307 | end else if Filename.check_suffix entry ".csv" then begin 308 | let ic = open_in full_path in 309 | let first_row = try input_line ic with End_of_file -> "" in 310 | let line_count = ref 0 in 311 | try while true do ignore (input_line ic); incr line_count done 312 | with End_of_file -> close_in ic; 313 | Printf.printf "%s%s (First row: %s, Lines: %d)\n" new_prefix entry first_row !line_count 314 | end else 315 | Printf.printf "%s%s\n" new_prefix entry 316 | ) entries 317 | in 318 | print_tree "." ""; 319 | {schema=[]; data=[]; path=""} 320 | | InsertInto (table, cols, vals) -> 321 | let rows = List.map (fun row -> 322 | List.map (fun f -> 323 | match List.assoc_opt f.name (List.combine cols row) with 324 | | Some v -> v 325 | | None -> default_value f.dtype 326 | ) table.schema 327 | ) vals in 328 | List.iter (fun row -> Database.append_row table row) rows; 329 | table 330 | | Update (table, col, value, cond) -> 331 | let col_index = List.assoc col (List.mapi (fun i f -> (f.name, i)) table.schema) in 332 | let data_updated = List.map (fun row -> 333 | if (match cond with 334 | | None -> true 335 | | Some c -> eval_cond c row table.schema) then 336 | List.mapi (fun i v -> if i == col_index then value else v) row else row 337 | ) table.data in 338 | table.data <- data_updated; 339 | table 340 | | DeleteFrom (table, cond) -> 341 | let data_deleted = List.filter (fun row -> match cond with 342 | | None -> true 343 | | Some c -> not (eval_cond c row table.schema)) table.data in 344 | table.data <- data_deleted; 345 | table 346 | | DropTable name -> 347 | Sys.remove name; 348 | {schema=[]; data=[]; path=name} 349 | | LoadObject expr -> 350 | (* placeholder, don't use *) 351 | let path = match expr with 352 | | Literal (VString s) -> s 353 | | _ -> failwith "Invalid argument" in 354 | let content = ObjectStorage.retrieve_file ~user_dir:"." path in 355 | (match content with 356 | | Some data -> 357 | let tbl = Database.load_table data in 358 | tbl 359 | | None -> failwith "Object not found") 360 | | StoreObject expr -> 361 | (* placeholder, don't use *) 362 | let tbl = match expr with 363 | | Literal (VString s) -> Database.load_table s 364 | | _ -> failwith "Invalid argument" in 365 | let path = ObjectStorage.store_file ~user_dir:"." tbl.path (tbl.path ^ ".csv") in 366 | Database.append_row tbl [VString path]; 367 | Database.save_table tbl; 368 | tbl 369 | | Exit -> exit 0 370 | end 371 | -------------------------------------------------------------------------------- /src/dune: -------------------------------------------------------------------------------- 1 | (executable 2 | (name main) 3 | (public_name sql) 4 | (modules main http_engine db_engine lexer parser) 5 | (libraries angstrom csv unix cmdliner lwt.unix cohttp cohttp-lwt-unix yojson lwt_ppx) 6 | (preprocess (pps lwt_ppx))) 7 | 8 | (ocamllex lexer) 9 | (ocamlyacc parser) -------------------------------------------------------------------------------- /src/http_engine.ml: -------------------------------------------------------------------------------- 1 | module Web = struct 2 | open Lwt 3 | open Cohttp 4 | open Cohttp_lwt_unix 5 | open Lwt.Syntax 6 | 7 | (* 请求数据类型 *) 8 | type request_data = 9 | | JSON of Yojson.Safe.t 10 | | Text of string 11 | | FormFile of (string * string) list (* (字段名, 临时路径) *) 12 | | Binary of string 13 | 14 | (* 响应数据类型 *) 15 | type response_data = 16 | | JsonResponse of Yojson.Safe.t 17 | | TextResponse of string 18 | | FileResponse of string (* 文件路径 *) 19 | | BinaryResponse of bytes 20 | 21 | (* RESTful路由类型 *) 22 | type route_pattern = 23 | | Static of string 24 | | Dynamic of string (* :id形式 *) 25 | | Wildcard 26 | 27 | type route = { 28 | method_: Code.meth; 29 | path: route_pattern list; 30 | handler: ((string * string)list -> request_data -> response_data Lwt.t); 31 | } 32 | 33 | (* Web服务状态 *) 34 | type service = { 35 | routes: route list ref; 36 | mutable middlewares: (Request.t -> request_data -> (Request.t * request_data) Lwt.t) list; 37 | } 38 | 39 | (* 路由解析器:路径串 string 转 route_pattern list *) 40 | let parse_path path = 41 | let split = path |> Uri.path 42 | |> String.split_on_char '/' 43 | |> List.filter (fun s -> s <> "") in 44 | List.map (fun s -> 45 | match s.[0] with 46 | | ':' -> Dynamic (String.sub s 1 (String.length s - 1)) 47 | | '*' -> Wildcard 48 | | _ -> Static s 49 | ) split 50 | 51 | (* 路由匹配，在所有 pattern 中找到匹配请求 path 的 pattern *) 52 | let rec match_route pattern path = 53 | match (pattern, path) with 54 | | [], [] -> Some [] 55 | | Wildcard::_, _ -> Some [] 56 | | Dynamic name::pt, Static hd::phd -> 57 | (* 匹配该动态域之后的部分是否有其他参数，将它们跟在该字段后返回 *) 58 | (match match_route pt phd with 59 | | Some params -> Some ((name, hd)::params) 60 | | None -> None) 61 | | Static a::pt, Static b::phd when a = b -> match_route pt phd 62 | | _ -> None 63 | 64 | (* 请求处理器 *) 65 | let handle_request service req body = 66 | let parse_multipart req body = 67 | let open Cohttp_lwt.Body in 68 | let%lwt body = to_string body in 69 | let boundary = req |> Request.headers |> fun h -> Header.get h "content-type" |> Option.get in 70 | let boundary = String.split_on_char '=' boundary |> List.tl |> String.concat "=" in 71 | let boundary = "--" ^ boundary in 72 | let parts = Re.Str.(split (regexp_string boundary) body) in 73 | let parts = List.filter (fun s -> s <> "" && s <> "--") parts in 74 | let parse_part part = 75 | let lines = String.split_on_char '\n' part in 76 | let lines = List.filter (fun s -> s <> "") lines in 77 | let header = List.hd lines in 78 | let header = String.split_on_char ';' header in 79 | let header = List.map (fun s -> String.trim s) header in 80 | let header = List.map (fun s -> String.split_on_char '=' s) header in 81 | let header = List.filter_map (function 82 | | [k; v] -> Some (k, v) 83 | | _ -> None 84 | ) header in 85 | let header = List.to_seq header |> Hashtbl.of_seq in 86 | let content = List.tl lines |> String.concat "\n" in 87 | let name = Hashtbl.find header "name" in 88 | let filename = Hashtbl.find_opt header "filename" in 89 | match filename with 90 | | Some _filename -> 91 | let tmp_path = Filename.temp_file "upload" "tmp" in 92 | Lwt_io.with_file ~mode:Lwt_io.output tmp_path (fun oc -> Lwt_io.write oc content) 93 | >|= fun () -> (name, tmp_path) 94 | | None -> Lwt.return (name, content) 95 | in 96 | Lwt_list.map_p parse_part parts 97 | in 98 | let path = req |> Request.uri in 99 | let meth = req |> Request.meth in 100 | let%lwt req_data = 101 | match Request.headers req |> Header.get_media_type with 102 | | Some "application/json" -> 103 | body |> Cohttp_lwt.Body.to_string >|= Yojson.Safe.from_string >|= fun j -> JSON j 104 | | Some "text/plain" -> 105 | body |> Cohttp_lwt.Body.to_string >|= fun s -> Text s 106 | | Some "multipart/form-data" -> 107 | (* 实现文件上传解析 *) 108 | parse_multipart req body >|= fun files -> FormFile files 109 | | _ -> 110 | body |> Cohttp_lwt.Body.to_string >|= fun s -> Text s 111 | in 112 | 113 | (* 应用中间件 *) 114 | (* TODO: 给请求参数叠进去 *) 115 | let%lwt (req, req_data) = 116 | List.fold_left (fun acc m -> acc >>= fun (r, d) -> m r d) 117 | (Lwt.return (req, req_data)) service.middlewares 118 | in 119 | 120 | (* 查找匹配路由 *) 121 | let matched = List.find_opt (fun r -> 122 | r.method_ = meth && 123 | match match_route r.path (parse_path path) with 124 | | Some _ -> true 125 | | None -> false 126 | ) !(service.routes) in 127 | 128 | match matched with 129 | | Some route -> 130 | let params = match_route route.path (parse_path path) |> Option.get in 131 | let%lwt resp = route.handler params req_data in 132 | (match resp with 133 | | JsonResponse j -> 134 | let body = Yojson.Safe.to_string j |> Cohttp_lwt.Body.of_string in 135 | Server.respond ~status:`OK ~headers:(Header.init_with "Content-Type" "application/json") ~body () 136 | | TextResponse t -> 137 | Server.respond_string ~headers:(Header.init_with "Content-Type" "text/plain") ~status:`OK ~body:t () 138 | | FileResponse path -> 139 | let%lwt body = Lwt_io.(with_file ~mode:input path read) >|= Cohttp_lwt.Body.of_string in 140 | let mime_type path = 141 | match Filename.extension path with 142 | | ".html" -> "text/html" 143 | | ".css" -> "text/css" 144 | | ".js" -> "application/javascript" 145 | | ".json" -> "application/json" 146 | | ".png" -> "image/png" 147 | | ".jpg" | ".jpeg" -> "image/jpeg" 148 | | ".gif" -> "image/gif" 149 | | _ -> "application/octet-stream" 150 | in 151 | Server.respond ~status:`OK ~headers:(Header.init_with "Content-Type" (mime_type path)) ~body () 152 | | BinaryResponse b -> 153 | Server.respond ~headers:(Header.init_with "Content-Type" "application/octet-stream") 154 | ~body:(Cohttp_lwt.Body.of_string (Bytes.to_string b)) ~status:`OK ()) 155 | | None -> 156 | Server.respond_string ~status:`Not_found ~body:"Route not found" () 157 | 158 | (* RESTful路由注册 *) 159 | let add_route service meth path handler = 160 | let pattern = parse_path (Uri.of_string path) in 161 | service.routes := {method_=meth; path=pattern; handler} :: !(service.routes) 162 | 163 | (* 中间件系统 *) 164 | let add_middleware service middleware = 165 | service.middlewares <- middleware :: service.middlewares 166 | 167 | (* 日志中间件 *) 168 | let logging_middleware req data = 169 | let%lwt () = Logs_lwt.info (fun m -> m "Request: %s %s" 170 | (Code.string_of_method req.Request.meth) 171 | (Request.uri req |> Uri.path)) in 172 | Lwt.return (req, data) 173 | 174 | (* CORS中间件 *) 175 | let cors_middleware req data = 176 | let headers = Header.init_with "Access-Control-Allow-Origin" "*" 177 | |> fun h -> Header.add h "Access-Control-Allow-Methods" "GET, POST, PUT, DELETE, OPTIONS" 178 | |> fun h -> Header.add h "Access-Control-Allow-Headers" "Content-Type" in 179 | Lwt.return (req, data) 180 | 181 | (* 服务创建 *) 182 | 183 | (* 启动服务 *) 184 | let start service port = 185 | let callback _conn req body = 186 | handle_request service req body 187 | in 188 | Server.create ~mode:(`TCP (`Port port)) (Server.make ~callback ()) 189 | end 190 | -------------------------------------------------------------------------------- /src/io_engine.ml: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/xeonds/sqlc/90ba3df2f14c31edd1a8888adb76e81b3384961b/src/io_engine.ml -------------------------------------------------------------------------------- /src/lexer.mll: -------------------------------------------------------------------------------- 1 | { 2 | open Parser 3 | 4 | exception Lexing_error of string 5 | } 6 | 7 | let whitespace = [' ' '\t' '\n' '\r']+ 8 | let digit = ['0'-'9'] 9 | let alpha = ['a'-'z' 'A'-'Z'] 10 | let alphanum = alpha | digit 11 | 12 | rule token = parse 13 | | whitespace { token lexbuf } (* Ignore whitespace *) 14 | | digit+ as num { INT (int_of_string num) } 15 | | digit+ "." digit* as num { FLOAT (float_of_string num) } 16 | | (alpha | '_') (alphanum | '_')* as id { 17 | match String.lowercase_ascii id with 18 | | "create" -> CREATE 19 | | "use" -> USE 20 | | "show" -> SHOW 21 | | "insert" -> INSERT 22 | | "into" -> INTO 23 | | "select" -> SELECT 24 | | "update" -> UPDATE 25 | | "set" -> SET 26 | | "drop" -> DROP 27 | | "delete" -> DELETE 28 | | "from" -> FROM 29 | | "where" -> WHERE 30 | | "exit" -> EXIT 31 | | "database" -> DATABASE 32 | | "databases" -> DATABASES 33 | | "tables" -> TABLES 34 | | "table" -> TABLE 35 | | "values" -> VALUES 36 | | "join" -> JOIN 37 | | "on" -> ON 38 | | "as" -> AS 39 | | "order" -> ORDER 40 | | "begin" -> BEGIN 41 | | "transaction" -> TRANSACTION 42 | | "commit" -> COMMIT 43 | | "rollback" -> ROLLBACK 44 | | "lock" -> LOCK 45 | | "unlock" -> UNLOCK 46 | | "view" -> VIEW 47 | | "index" -> INDEX 48 | | "log" -> LOG 49 | | "int" -> INT_TYPE 50 | | "string" -> STRING_TYPE 51 | | "float" -> FLOAT_TYPE 52 | | "bool" -> BOOL_TYPE 53 | | "and" -> AND 54 | | "or" -> OR 55 | | "not" -> NOT 56 | | "true" -> BOOL true 57 | | "false" -> BOOL false 58 | | _ -> IDENTIFIER id 59 | } 60 | | ['a'-'z' 'A'-'Z' '0'-'9' '/' '.' '_']+ as path { FILE path } 61 | | '"'[^'"']*'"' as str { STRING (String.sub str 1 (String.length str - 2)) } 62 | | "*" { STAR } 63 | | "," { COMMA } 64 | | ";" { SEMICOLON } 65 | | "." { DOT } 66 | | "=" { EQUALS } 67 | | "<" { LESS } 68 | | ">" { GREATER } 69 | | "<=" { LESS_EQUAL } 70 | | ">=" { GREATER_EQUAL } 71 | | "<>" { NOT_EQUAL } 72 | | "+" { PLUS } 73 | | "-" { MINUS } 74 | | "/" { DIVIDE } 75 | | "%" { MOD } 76 | | "(" { LPAREN } 77 | | ")" { RPAREN } 78 | | eof { EOF } 79 | | _ as c { raise (Lexing_error (Printf.sprintf "Unexpected character: %c" c)) } 80 | -------------------------------------------------------------------------------- /src/main.ml: -------------------------------------------------------------------------------- 1 | open Cmdliner 2 | open Db_engine 3 | open Db_engine.Types 4 | 5 | (* 定义文件名参数 *) 6 | let filename = 7 | let doc = "Input .sql file name" in 8 | Arg.(value & pos 0 (some string) None & info [] ~docv:"FILENAME" ~doc) 9 | 10 | (* 读取文件内容的函数 *) 11 | let read_file filename = 12 | try 13 | let ch = open_in filename in 14 | let content = really_input_string ch (in_channel_length ch) in 15 | close_in ch; 16 | Some content 17 | with _ -> None 18 | 19 | let eval_sql: (statement->table) = function 20 | | Select (cols, from, join, where) -> 21 | let table = Database.load_table (from ^ ".csv") in 22 | if join = None then 23 | Engine.execute (Select (cols, table, where)) 24 | else 25 | let (from2, on) = Option.get join in 26 | let table2 = Database.load_table (from2 ^ ".csv") in 27 | let joined_table = Engine.execute (Join (table, table2, on)) in 28 | Engine.execute (Select (cols, joined_table, where)) 29 | | CreateTable (name, columns) -> 30 | Engine.execute (CreateTable (name, columns)) 31 | | InsertInto (table, columns, values) -> 32 | let table = Database.load_table (table ^ ".csv") in 33 | let result = Engine.execute (InsertInto (table, columns, values)) in 34 | Database.save_table table; 35 | result 36 | | Update (table, column, value, where) -> 37 | let table = Database.load_table ( table ^ ".csv" ) in 38 | Engine.execute (Update (table, column, value, where)) 39 | | DeleteFrom (table, where) -> 40 | let table = Database.load_table (table^".csv") in 41 | Engine.execute (DeleteFrom (table, where)) 42 | | ShowTables -> Engine.execute ShowTables 43 | | DropTable table -> Engine.execute (DropTable table) 44 | | LoadObject table -> Engine.execute (LoadObject table) 45 | | StoreObject table -> Engine.execute (StoreObject table) 46 | | Exit -> exit 0 47 | 48 | (* 交互式终端 *) 49 | let rec repl () = 50 | try 51 | Printf.printf ">>> "; 52 | let line = read_line () in 53 | let lexbuf = Lexing.from_string line in 54 | let parsed_expr = Parser.program Lexer.token lexbuf in 55 | let result = eval_sql parsed_expr in 56 | Printf.printf "%s\n" (Types.string_of_table result); 57 | repl () 58 | with 59 | | Lexer.Lexing_error msg -> Printf.printf "Lexer error: %s\n" msg; repl () 60 | | Parsing.Parse_error -> Printf.printf "Parser error\n"; repl () 61 | | End_of_file -> () 62 | 63 | let main filename = 64 | match filename with 65 | | None -> 66 | Printf.printf "Welcome to the SQL REPL!\n"; 67 | repl() 68 | | Some file -> 69 | match read_file file with 70 | | Some content -> ( 71 | (* 按行执行.sql文件的内容，遇到错误就报错并进入repl *) 72 | let lexbuf = Lexing.from_string content in 73 | try 74 | while true do 75 | let parsed_expr = Parser.program Lexer.token lexbuf in 76 | let result = eval_sql parsed_expr in 77 | Printf.printf "%s\n" (Types.string_of_table result); 78 | done 79 | with 80 | | Lexer.Lexing_error msg -> Printf.printf "Lexer error: %s\n" msg; repl () 81 | | Parsing.Parse_error -> Printf.printf "Parser error\n"; repl () 82 | | End_of_file -> ()) 83 | | None -> 84 | Printf.printf "Error: Unable to read file '%s'\n" file 85 | 86 | (* 命令行配置 *) 87 | let cmd = 88 | let doc = "A program that reads and processes a file" in 89 | let info = Cmd.info "sql" ~doc ~version:"1.0.0" in 90 | Cmd.v info Term.(const main $ filename) 91 | 92 | (* 运行程序 *) 93 | let () = exit (Cmd.eval cmd) -------------------------------------------------------------------------------- /src/parser.mly: -------------------------------------------------------------------------------- 1 | /* parser.mly */ 2 | /* Simple SQL statement parser */ 3 | /* Tokens */ 4 | %token IDENTIFIER FILE 5 | %token INT 6 | %token STRING 7 | %token FLOAT 8 | %token BOOL 9 | %token CREATE USE SHOW INSERT INTO SELECT UPDATE SET DROP DELETE FROM WHERE EXIT 10 | %token DATABASES DATABASE TABLES TABLE VALUES JOIN ON AS 11 | %token BEGIN TRANSACTION COMMIT ROLLBACK LOCK UNLOCK 12 | %token VIEW INDEX LOG 13 | %token LPAREN RPAREN COMMA SEMICOLON 14 | %token STAR DOT MOD EQUALS LESS GREATER LESS_EQUAL GREATER_EQUAL NOT_EQUAL PLUS MINUS TIMES DIVIDE 15 | %token EOF 16 | %token INT_TYPE STRING_TYPE FLOAT_TYPE BOOL_TYPE 17 | %token AND OR NOT ORDER BY LIMIT 18 | 19 | %start program 20 | %type program 21 | 22 | %% /* Grammar rules and actions */ 23 | 24 | program: 25 | | statement SEMICOLON { $1 } 26 | | EOF { Exit } 27 | 28 | statement: 29 | | SELECT columns FROM FILE opt_join opt_where { Select($2, $4, $5, $6) } 30 | | CREATE TABLE FILE LPAREN table_columns RPAREN { CreateTable($3, $5) } 31 | | SHOW TABLES { ShowTables } 32 | | INSERT INTO FILE LPAREN columns RPAREN VALUES values { InsertInto($3, $5, $8) } 33 | | UPDATE FILE SET IDENTIFIER EQUALS value opt_where { Update($2, $4, $6, $7) } 34 | | DELETE FROM FILE opt_where { DeleteFrom($3, $4) } 35 | | DROP TABLE FILE { DropTable $3 } 36 | | EXIT { Exit } 37 | 38 | opt_join: 39 | | JOIN FILE ON expr { Some ($2, $4) } 40 | | { None } 41 | 42 | opt_where: 43 | | WHERE expr { Some $2 } 44 | | { None } 45 | 46 | table_columns: 47 | | column_def COMMA table_columns { $1 :: $3 } 48 | | column_def { [$1] } 49 | 50 | column_def: 51 | | IDENTIFIER dtype { ($1, $2) } 52 | 53 | columns: 54 | | STAR { ["*"] } 55 | | IDENTIFIER COMMA columns { $1 :: $3 } 56 | | IDENTIFIER { [$1] } 57 | 58 | dtype: 59 | | INT_TYPE { Int } 60 | | STRING_TYPE { String } 61 | | FLOAT_TYPE { Float } 62 | | BOOL_TYPE { Bool} 63 | 64 | values: 65 | | LPAREN values_def RPAREN values { $2 :: $4 } 66 | | LPAREN values_def RPAREN { [$2] } 67 | 68 | values_def: 69 | | value COMMA values_def { $1 :: $3 } 70 | | value { [$1] } 71 | 72 | value: 73 | | INT { VInt $1 } 74 | | STRING { VString $1 } 75 | | FLOAT { VFloat $1 } 76 | | BOOL { VBool $1 } 77 | 78 | expr: 79 | | value { Literal $1 } 80 | | IDENTIFIER { Column $1 } 81 | | expr PLUS expr { BinOp($1, "+", $3) } 82 | | expr MINUS expr { BinOp($1, "-", $3) } 83 | | expr TIMES expr { BinOp($1, "*", $3) } 84 | | expr DIVIDE expr { BinOp($1, "/", $3) } 85 | | expr MOD expr { BinOp($1, "%", $3) } 86 | | expr EQUALS expr { BinOp($1, "=", $3) } 87 | | expr LESS expr { BinOp($1, "<", $3) } 88 | | expr GREATER expr { BinOp($1, ">", $3) } 89 | | expr LESS_EQUAL expr { BinOp($1, "<=", $3) } 90 | | expr GREATER_EQUAL expr { BinOp($1, ">=", $3) } 91 | | expr NOT_EQUAL expr { BinOp($1, "<>", $3) } 92 | | expr AND expr { BinOp($1, "AND", $3) } 93 | | expr OR expr { BinOp($1, "OR", $3) } 94 | | LPAREN expr RPAREN { $2 } 95 | | NOT expr { Call("NOT", [$2]) } 96 | | IDENTIFIER LPAREN expr_list RPAREN { Call($1, $3) } 97 | 98 | expr_list: 99 | | expr COMMA expr_list { $1 :: $3 } 100 | | expr { [$1] } 101 | --------------------------------------------------------------------------------