Package net.hydromatic.filtex.ast

Class Asts

java.lang.Object

net.hydromatic.filtex.ast.Asts

public class Asts
extends Object

Utilities for AST nodes.

Method Summary

Modifier and Type	Method	Description
static AstNode	applyId(AstNode root)	Ensures that every node has a unique id.
static String	convertTypeToMatchesAdvancedOption(String type)	Converts filter types to matches (advanced).
static String	convertTypeToOption(boolean is, String type)	Converts a type to an option.
static String	dateFilterToString(AstNode root, TypeFamily typeFamily)	Converts the AST to an array of FilterItems and then converts each item into its expression representation.
static @Nullable AstNode	removeNode(AstNode root, Integer nodeId)	Removes node from the AST.
static void	traverse(AstNode root, Consumer<AstNode> consumer)	Walks over a tree, applying a consumer to each node.
static List<AstNode>	treeToList(AstNode root)	Converts a FilterAST to a list of FilterASTNodes using in order traversal (left, node, right)
static String	treeToString(AstNode root, Function<AstNode,String> f, Predicate<AstNode> predicate)	Given an AST and a nodeToString conversion function for that particular type of filter, it converts the AST to a string expression representation.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details

treeToList

public static List<AstNode> treeToList(AstNode root)

Converts a FilterAST to a list of FilterASTNodes using in order traversal (left, node, right)

    (root(1))      ->  [0,1,2,3,4]
    /      \
 left(0)   right(3)
           /     \
      left(2)     right(4)
 

See tree_to_list.ts

treeToString

public static String treeToString(AstNode root,
 Function<AstNode,String> f,
 Predicate<AstNode> predicate)

Given an AST and a nodeToString conversion function for that particular type of filter, it converts the AST to a string expression representation.

See tree_to_string.ts.

traverse

public static void traverse(AstNode root,
 Consumer<AstNode> consumer)

Walks over a tree, applying a consumer to each node.

applyId

public static AstNode applyId(AstNode root)

Ensures that every node has a unique id.

removeNode

public static @Nullable AstNode removeNode(AstNode root,
 Integer nodeId)

Removes node from the AST.

convertTypeToOption

public static String convertTypeToOption(boolean is,
 String type)

Converts a type to an option.

See convert_type_to_option.ts.

convertTypeToMatchesAdvancedOption

public static String convertTypeToMatchesAdvancedOption(String type)

Converts filter types to matches (advanced).

dateFilter 'day', type 'thisRange', and type 'pastAgo' need to be in the filter list, but we do not want it showing up in the advanced filter options therefore it should be converted to matches (advanced).

See convert_type_to_matches_advanced_option.ts.

dateFilterToString

public static String dateFilterToString(AstNode root,
 TypeFamily typeFamily)

Converts the AST to an array of FilterItems and then converts each item into its expression representation.