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Index ¶
Constants ¶
This section is empty.
Variables ¶
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Functions ¶
This section is empty.
Types ¶
type Expr ¶
type Expr interface {
Eval(env Env) float64
// Check reports errors in this Expr and adds its Vars to the set.
Check(vars map[Var]bool) error
fmt.Stringer
}
func Parse ¶
Parse parses the input string as an arithmetic expression.
expr = num a literal number, e.g., 3.14159
| id a variable name, e.g., x
| 'min' '(' expr ',' expr ')' the min operator, e.g., min(1, 2) => 1
| id '(' expr ',' ... ')' a function call
| '-' expr a unary operator (+-)
| expr '+' expr a binary operator (+-*/)
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