Ordo Expression Syntax

Operators

Comparison Operators

Logical Operators

Arithmetic Operators

Field Access

Dot Notation

user.name
user.profile.level
order.items[0].price

Array Indexing

items[0]
matrix[1][2]
users[index]

Safe Access (coalesce)

coalesce(user.nickname, user.name, "Anonymous")

Built-in Functions

String Functions

Math Functions

Array Functions

Type Functions

Conversion Functions

Time Functions

Conditional Expressions

if-then-else

if condition then value1 else value2

Examples:

if exists(discount) then price * (1 - discount) else price
if vip == true then 0.2 else 0.05
if age >= 18 then "adult" else "minor"

exists Check

if exists(user.nickname) then user.nickname else user.name

Nested Conditions

if tier == "gold" then 0.2
else if tier == "silver" then 0.1
else 0.05

Literals

Numbers

42          # Integer
3.14        # Float
-100        # Negative

Strings

"hello"
"it's ok"
"line1\nline2"

Booleans

true
false

Null

null

Rust API

Parsing Expressions

use ordo_core::prelude::*;

let parser = ExprParser::new();
let expr = parser.parse("age >= 18 && status == \"active\"")?;

Evaluation

let evaluator = Evaluator::new();
let context = Context::from_json(r#"{"age": 25, "status": "active"}"#)?;
let result = evaluator.eval(&expr, &context)?;

Compile to Bytecode

let compiler = ExprCompiler::new();
let compiled = compiler.compile(&expr)?;
let vm = BytecodeVM::new();
let result = vm.execute(&compiled, &context)?;

Key Files

• crates/ordo-core/src/expr/parser.rs - Expression parser
• crates/ordo-core/src/expr/eval.rs - Expression evaluation
• crates/ordo-core/src/expr/functions.rs - Built-in functions
• crates/ordo-core/src/expr/ast.rs - AST definitions