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feat/pattern matching #140

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89bc58b
getting pattern matching up and running
xav-db May 28, 2025
ab5f699
grammar for pattern matching done
xav-db May 29, 2025
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42 changes: 29 additions & 13 deletions helixdb/src/grammar.pest
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Original file line number Diff line number Diff line change
@@ -1,7 +1,7 @@
// ---------------------------------------------------------------------
// Main rules
// ---------------------
source = { SOI ~ (node_def | edge_def | vector_def | query_def)* ~ EOI }
source = { SOI ~ (node_def | edge_def | vector_def | enum_def | query_def)* ~ EOI }


// ---------------------------------------------------------------------
Expand All @@ -10,6 +10,7 @@ source = { SOI ~ (node_def | edge_def | vector_def | query_def)* ~ EOI }
vector_def = { "V::" ~ identifier_upper ~ node_body? }
node_def = { "N::" ~ identifier_upper ~ node_body? }
edge_def = { "E::" ~ identifier_upper ~ edge_body }
enum_def = { "Enum::" ~ identifier_upper ~ enum_body }

node_body = { "{" ~ field_defs ~ "}" }
edge_body = { "{" ~ "From:" ~ identifier_upper ~ "," ~ ("To:" ~ identifier_upper ~ "," ~ properties ~ "}" | "To:" ~ identifier_upper ~ ","? ~ "}") }
Expand All @@ -18,6 +19,9 @@ field_def = { index? ~ identifier ~ ":" ~ param_type ~ (default)? }
index= { "INDEX" }
default = { "DEFAULT" ~ (now | float | integer | boolean | string_literal | none) }
// optional = { "OPTIONAL" }
enum_body = { "{" ~ enum_fields ~ "}" }
enum_fields = { (enum_field ~ ",")* ~ (enum_field ~ ","?)? }
enum_field = { identifier_upper ~ ("(" ~ identifier_upper ~ ")")? }


properties = { "Properties" ~ ":" ~ "{" ~ field_defs? ~ "}" }
Expand All @@ -39,7 +43,7 @@ get_stmt = { identifier ~ "<-" ~ evaluates_to_anything }
traversal = { (start_node | start_edge | start_vector ) ~ step* ~ last_step? }
id_traversal = { identifier ~ ((step+ ~ last_step?) | last_step) }
anonymous_traversal = { "_" ~ ((step+ ~ last_step?) | last_step)? }
step = { "::" ~ (graph_step | where_step | closure_step | object_step | exclude_field | count | ID | range_step | AddE) }
step = { "::" ~ (graph_step | where_step | match_step | closure_step | object_step | exclude_field | count | ID | range_step | AddE) }
last_step = { "::" ~ (bool_operations | update) }
// change this for loop to be able to take traversals etc in the future.
for_loop = { "FOR" ~ for_argument ~ "IN" ~ identifier ~ "{" ~ query_body ~ "}" }
Expand Down Expand Up @@ -115,10 +119,11 @@ AddV = { "AddV" ~ ("<" ~ identifier_upper ~ ">") ~ ("(" ~ vector_data ~
// ---------------------------------------------------------------------
// Source steps
// ---------------------------------------------------------------------
start_node = { "N" ~ ("<" ~ type_args ~ ">")? ~ ("(" ~ (id_args | by_index) ~ ")")? }
start_edge = { "E" ~ ("<" ~ type_args ~ ">")? ~ ("(" ~ (id_args | by_index) ~ ")")? }
start_vector = { "V" ~ ("<" ~ type_args ~ ">")? ~ ("(" ~ (id_args | by_index) ~ ")")? }
start_node = { "N" ~ ("<" ~ type_args ~ ">")? ~ ("(" ~ (id_args | by_index) ~ ")")? ~ variable_declaration? }
start_edge = { "E" ~ ("<" ~ type_args ~ ">")? ~ ("(" ~ (id_args | by_index) ~ ")")? ~ variable_declaration? }
start_vector = { "V" ~ ("<" ~ type_args ~ ">")? ~ ("(" ~ (id_args | by_index) ~ ")")? ~ variable_declaration? }
by_index = { "{" ~ id_arg ~ ":" ~ evaluates_to_anything ~ "}" }

// ---------------------------------------------------------------------
// Traversal steps
// ---------------------------------------------------------------------
Expand All @@ -131,13 +136,13 @@ graph_step = {
| in_nodes
| shortest_path
}
out_e ={ "OutE" ~ ("<" ~ type_args ~ ">")?}
in_e ={ "InE" ~ ("<" ~ type_args ~ ">")?}
from_n ={ "FromN"}
to_n ={ "ToN"}
out ={ "Out" ~ ("<" ~ type_args ~ ">")?}
in_nodes ={ "In" ~ ("<" ~ type_args ~ ">")?}
shortest_path ={ "ShortestPath" ~ ("<" ~ type_args ~ ">")? ~ to_from}
out_e ={ "OutE" ~ ("<" ~ type_args ~ ">")? ~ variable_declaration?}
in_e ={ "InE" ~ ("<" ~ type_args ~ ">")? ~ variable_declaration?}
from_n ={ "FromN" ~ variable_declaration?}
to_n ={ "ToN" ~ variable_declaration?}
out ={ "Out" ~ ("<" ~ type_args ~ ">")? ~ variable_declaration?}
in_nodes ={ "In" ~ ("<" ~ type_args ~ ">")? ~ variable_declaration?}
shortest_path ={ "ShortestPath" ~ ("<" ~ type_args ~ ">")? ~ to_from ~ variable_declaration?}


// ---------------------------------------------------------------------
Expand All @@ -153,6 +158,17 @@ update_field = { identifier ~ ":" ~ (evaluates_to_anything | anonymous_traversal
update = { "UPDATE" ~ "(" ~ "{" ~ update_field ~ ("," ~ update_field)* ~ "}" ~ ")" }
drop = { "DROP" ~ (traversal | id_traversal | identifier)? }

// ---------------------------------------------------------------------
// Match steps
// ---------------------------------------------------------------------
match_step = { "MATCH" ~ match_variable? ~ "{" ~ match_statements ~ "}" }
match_variable = { "|" ~ (identifier | traversal | "_") ~ "|" }
match_statements = { (match_statement ~ ",")* ~ match_statement ~ ","? }
match_statement = { match_type ~ "=>" ~ match_value }
match_type = { identifier_upper ~ "::" ~ identifier_upper ~ ("(" ~ identifier ~ ")")?}
match_value = { "{" ~ query_body ~ "}" | traversal | id_traversal | anonymous_traversal | none | identifier }


// ---------------------------------------------------------------------
// Vector steps
// ---------------------------------------------------------------------
Expand Down Expand Up @@ -183,7 +199,7 @@ exclude_field = { "!" ~ "{" ~ identifier ~ ("," ~ identifier)* ~ ("," ~ spread_o
closure_step = { "|" ~ identifier ~ "|" ~ object_step }
spread_object = { ".." ~ ","?}
mapping_field = { (identifier ~ (":" ~ (anonymous_traversal | evaluates_to_anything | object_step))) | identifier }

variable_declaration = { "|" ~ identifier ~ "|" }

// ---------------------------------------------------------------------
// Types
Expand Down
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