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§Figure Skating Element Parser Grammar
This documentation explains the rules and structure of the grammar used in the figure skating element parser.
§Rules
§WHITESPACE
This rule matches any whitespace characters (space, tab, newline).
WHITESPACE = _{ " " | "\t" | "\n" }§DIGIT
This rule matches any numeric characters from 0 to 9.
DIGIT = { "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9" }§element
This main rule defines all possible figure skating elements that the parser can recognize. Each element type corresponds to a distinct category.
element = { jump | spin | step_sequence | death_spiral | pair_spin | twizzle | choreographic_element }§jump
The rule for jumps, supporting various levels of difficulty, including single, double, triple, and quad jumps.
jump = { ("1" | "2" | "3" | "4") ~ jump_type ~ throw_jump? }§jump_type:
Defines the type of jump (e.g., Toeloop, Salchow, Loop, Flip, Lutz, Axel).
jump_type = { "T" | "S" | "Lo" | "F" | "Lz" | "A" }§throw_jump:
Indicates a “throw” jump (used in pairs skating).
throw_jump = { "Th" }§spin
The rule for spins, including standard spins, flying spins, and change-foot spins.
spin = { (spin_position ~ "Sp") | flying_spin | flying_change_foot_spin }§spin_position:
Specifies the spin position (e.g., Upright, Camel, Layback, Sit).
spin_position = { "U" | "L" | "C" | "S" }§step_sequence
The rule for step sequences. These can be standard or choreographic step sequences.
step_sequence = { "StSq" | "ChSq" }§death_spiral
The rule for death spirals. This includes forward and backward positions.
death_spiral = { death_spiral_position ~ "Ds" }§death_spiral_position:
Defines the death spiral position (e.g., Forward Inside, Backward Outside).
death_spiral_position = { "Fi" | "Bi" | "Fo" | "Bo" }§pair_spin
The rule for spins in pairs skating.
pair_spin = { "PSp" | "PCoSp" }§twizzle
The rule for twizzles (rotational elements).
twizzle = { "STw" }§choreographic_element
The rule for choreographic elements, including choreographic lifts and spins.
choreographic_element = { "ChLi1" | "ChSp1" }