EytionLang -- an programming language

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The current version is not a stable version. If you want to use eytion, please download the latest version in the release. The open source code is only for learning and communication. It is not recommended to use it in daily life

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Grammar

Eytion is a lightweight interpretation language that currently supports the following syntax:

mulExpr->primExpr (mulOperator primExpr)*
mulOperator-> "*"|"/"|"%""
addExpr->mulExpr (addOperator mulExpr)*
addOperator->"+"|"-""

cmpOp->'=='|'!='|'>'|'<'|'>='|'<='
cmpExpr->addExpr (cmpOp addExpr)
boolOp->'&&' | '||'
boolExpr->cmpExpr (boolOp cmpExpr)*
notExpr->'!'* boolExpr
primExpr->number|string|'('expr')'

expr->notExpr
stmt->outStmt
stat->stmt*

OutStmt->"out" addExpr ";"
VorcStmt->("var"|"const)" "<"type">"iden "=" (value | value_expr) ";"
AssignStmt->iden "=" (value | value_expr) ";"
DeleteStmt->"delete" iden ";"
InputStmt->"input" "(" content ")" "=>" identifier ";"
WhileStmt->"while" boolExpr | notBoolExpr ":" block
IfStmt->"if" boolExpr | notBoolExpr ":" block
BlockStmt->"{" stmts "}"

More syntax waiting to be updated

Install

You can use the following command to get your first compilation:

cmake --build

In subsequent compilation, you should use the following commands:

cmake --build build

Project Preview

The following files are available in Eyton's project directory(only src):

SRC
│  eymain.cpp
│  osstd.cpp
│  osstd.h
│
├─eexception
│      eexcp.cpp
│      eexcp.h
│
├─ey
│  ├─scope
│  │      eyscope.cpp
│  │      eyscope.h
│  │
│  └─value
│          eytype.cpp
│          eytype.h
│          eyvalue.cpp
│          eyvalue.h
│
├─eycodegen
│      generator.cpp
│      generator.h
│
├─eyexec
│      executer.cpp
│      executer.h
│
├─eylexer
│      lex.cpp
│      lex.h
│
├─eyparser
│      ast.cpp
│      ast.h
│      parser.cpp
│      parser.h
│
└─eysystem
        command.cpp
        command.h
        econfig.cpp
        econfig.h

Next, briefly describe the functions of all the first level subfolders and internal files under the SRC directory

Folder name	Important sub files	Role of folders and important sub files
eysystem	econfig.* and command.*	Eyton's shell and configuration system are implemented here. Econfig is the configuration file implementation and command is the shell implementation
eylexer	lex.*	The lexer of eytion is implemented here
eyparser	parser.*	The parser of eytion is implemented here
eycodegen	generator.*	The intermediate code generator for eytion is implemented here
eyexec	executer.*	Eyton's running code system
eexception	eexcp.*	Eyton's abnormal system
ey	value/eyvalue.* scope/eyscope.*	Eytion language content implementation part, variable / constant system in value folder, scope scope scope and code block system

Run .ey files

eytion -f file.ey

or

eytion -shell

run file.ey

Examples

HelloWorld

out "Hello, World!";

variable/constant

var <string> str = "eytion";
var <int> n1 = 2;
var <deci> n2 = 1.5;
out str;
str = "test";
const <deci> number = n1 + n2;
out number;
out str;

input

var <string> str = " ";
input("please input: ")=>str;
out str;

if

var <string> str = " ";
input("please input: ")=>str;
if str == "hello world!":{
    out "hello!!!!!!";
}

while

var <int> i = 0;
var <string> str = " ";
input("please input: ")=>str;
while i == 5:{
    out str;
    i = i + 1;
}

array

array<[5]string> sl = ["hel", "lo", "wo", "rl", "d"];
var <int> i  = 0;
while i == 5:{
    out sl[i];
    i=i+1;
}
sl[4] = "wwwwwwww";
out sl[4];

Thanks

Thank the following people for their support for this project:

theflysong
xiaokang00010

Third party libraries used in the project:

CJsonObject (by Bwar)CJsonObject

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