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Copy pathtoken.go
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152 lines (143 loc) · 3.76 KB
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package main
import "strings"
// Type represents a token's type.
type TokenType string
// Token represents a lexer token.
type Token struct {
Type TokenType
Literal string
Line int
Column int
}
// Tokens for the VHS language
const (
AT = "@"
EQUAL = "="
PLUS = "+"
PERCENT = "%"
SLASH = "/"
DOT = "."
DASH = "-"
PX = "PX"
EM = "EM"
EOF = "EOF"
ILLEGAL = "ILLEGAL"
SPACE = "SPACE"
BACKSPACE = "BACKSPACE"
CTRL = "CTRL"
ENTER = "ENTER"
NUMBER = "NUMBER"
SET = "SET"
SLEEP = "SLEEP"
STRING = "STRING"
JSON = "JSON"
TYPE = "TYPE"
DOWN = "DOWN"
LEFT = "LEFT"
RIGHT = "RIGHT"
UP = "UP"
TAB = "TAB"
ESCAPE = "ESCAPE"
DELETE = "DELETE"
HOME = "HOME"
INSERT = "INSERT"
END = "END"
HIDE = "HIDE"
REQUIRE = "REQUIRE"
SHOW = "SHOW"
OUTPUT = "OUTPUT"
MILLISECONDS = "MILLISECONDS"
SECONDS = "SECONDS"
MINUTES = "MINUTES"
COMMENT = "COMMENT"
SHELL = "SHELL"
FONT_FAMILY = "FONT_FAMILY" //nolint:revive
FONT_SIZE = "FONT_SIZE" //nolint:revive
FRAMERATE = "FRAMERATE"
PLAYBACK_SPEED = "PLAYBACK_SPEED" //nolint:revive
HEIGHT = "HEIGHT"
WIDTH = "WIDTH"
LETTER_SPACING = "LETTER_SPACING" //nolint:revive
LINE_HEIGHT = "LINE_HEIGHT" //nolint:revive
TYPING_SPEED = "TYPING_SPEED" //nolint:revive
PADDING = "PADDING"
THEME = "THEME"
LOOP_OFFSET = "LOOP_OFFSET" //nolint:revive
)
var keywords = map[string]TokenType{
"em": EM,
"px": PX,
"ms": MILLISECONDS,
"s": SECONDS,
"m": MINUTES,
"Set": SET,
"Sleep": SLEEP,
"Type": TYPE,
"Enter": ENTER,
"Space": SPACE,
"Backspace": BACKSPACE,
"Ctrl": CTRL,
"Down": DOWN,
"Left": LEFT,
"Right": RIGHT,
"Up": UP,
"Tab": TAB,
"Escape": ESCAPE,
"End": END,
"Hide": HIDE,
"Require": REQUIRE,
"Show": SHOW,
"Output": OUTPUT,
"Shell": SHELL,
"FontFamily": FONT_FAMILY,
"FontSize": FONT_SIZE,
"Framerate": FRAMERATE,
"Height": HEIGHT,
"LetterSpacing": LETTER_SPACING,
"LineHeight": LINE_HEIGHT,
"PlaybackSpeed": PLAYBACK_SPEED,
"TypingSpeed": TYPING_SPEED,
"Padding": PADDING,
"Theme": THEME,
"Width": WIDTH,
"LoopOffset": LOOP_OFFSET,
}
// IsSetting returns whether a token is a setting.
func IsSetting(t TokenType) bool {
switch t {
case SHELL, FONT_FAMILY, FONT_SIZE, LETTER_SPACING, LINE_HEIGHT,
FRAMERATE, TYPING_SPEED, THEME, PLAYBACK_SPEED,
HEIGHT, WIDTH, PADDING, LOOP_OFFSET:
return true
default:
return false
}
}
// IsCommand returns whether the string is a command
func IsCommand(t TokenType) bool {
switch t {
case TYPE, SLEEP,
UP, DOWN, RIGHT, LEFT,
ENTER, BACKSPACE, DELETE, TAB,
ESCAPE, HOME, INSERT, END, CTRL:
return true
default:
return false
}
}
// String converts a token to it's human readable string format.
func (t TokenType) String() string {
if IsCommand(t) || IsSetting(t) {
return strings.ToTitle(string(t[0])) + strings.ToLower(string(t[1:]))
}
return string(t)
}
// LookupIdentifier returns whether the identifier is a keyword.
// In `vhs`, there are no _actual_ identifiers, i.e. there are no variables.
// Instead, identifiers are simply strings (i.e. bare words).
func LookupIdentifier(ident string) TokenType {
if t, ok := keywords[ident]; ok {
return t
}
return STRING
}