Parsek/org.kobjects.parsek.expressionparser/ConfigurableExpressionParser

ConfigurableExpressionParser

open class ConfigurableExpressionParser<S : Scanner<*>, C, R>(val parsePrimary: (S, C) -> R, operators: ConfigurableExpressionParser.Operators<S, C, R>)

A simple configurable expression parser.

S is the scanner type
C is the type of the parsing context, typically holding variable definitions etc.
R is the type of the parsed expression.

The parser is primarily configured by defining operators using the prefix, infix and suffix companion functions, defining operator names, types and precedences.

Constructors

ConfigurableExpressionParser

constructor(parsePrimary: (S, C) -> R, vararg operators: ConfigurableExpressionParser.Operators<S, C, R>)

Types

Companion

object Companion

Operator

interface Operator<S, C, R>

Internal operator representation, consisting of the precedence and a build function.

Operators

class Operators<S, C, R>(val prefix: Map<String, ConfigurableExpressionParser.Operator.Unary<S, C, R>>, val infixOrSuffix: Map<String, ConfigurableExpressionParser.Operator<S, C, R>>)

Maps operator names to their arity, precedence and build function.

Properties

parsePrimary

val parsePrimary: (S, C) -> R

Functions

parseExpression

fun parseExpression(scanner: S, context: C, precedence: Int = -1): R

Parser an expression from the given tokenizer. Leftover tokens will be ignored and may be handled by the caller.