Emacs LSL Mode

Since I can't figure out how to attach this or whatever to the page, you'll have to copy-and-paste the text below into a file called "lsl-mode.el" so the autoload in the comments below can work out.

I have modified this slightly to allow for C++ style comments not C comments (// instead of /* */){--RichardR Bleac 08:01, 13 June 2007 (PDT)}

Updated LSL Constants list {-- Kittin Ninetails 15 July 2013}

;; ; This software has been given to the PUBLIC DOMAIN. Use it as you see
;; fit. As usual, no warrantees are available, neither expressed nor
;; implied. You use this software at your own risk.

;; To load this into emacs, add the following lines to your .emacs:
;
; (add-to-list 'load-path "/path/to/directory/containing/this/file")
; (autoload 'lsl-mode "lsl-mode" "Load LSL mode." t)
; (add-to-list 'auto-mode-alist '("\\.lsl$" . lsl-mode))
;
;; You should then be able to load up LSL files and get the pretty
;; colors and indentation.

;; This is derived from C-mode, since LSL is so similar. There'll
;; probably be a couple gotchas as a result. I haven't tested this
;; thorougly, but it works well enough for me. If you have any
;; improvements, feel free to contact Brain Curry in game.
;;
;; (2013/07/15) Updated lsl constants
;; Kittin Ninetails 

(defcustom lsl-keywords
  '("for" "if" "else" "break" "while" "do" "return" "state" "default")
  "LSL keywords."
  :type 'list
  :group 'lsl-font-lock)

(defcustom lsl-types
  '("integer" "float" "string" "key" "list" "vector" "rotation")
  "LSL types."
  :type 'list
  :group 'lsl-font-lock)

(defcustom lsl-constants
  '( "ACTIVE" "AGENT" "AGENT_ALWAYS_RUN" "AGENT_ATTACHMENTS" "AGENT_AUTOPILOT" "AGENT_AWAY" "AGENT_BUSY" "AGENT_BY_LEGACY_NAME" "AGENT_BY_USERNAME" "AGENT_CROUCHING" "AGENT_FLYING" "AGENT_IN_AIR" "AGENT_LIST_PARCEL" "AGENT_LIST_PARCEL_OWNER" "AGENT_LIST_REGION" "AGENT_MOUSELOOK" "AGENT_ON_OBJECT" "AGENT_SCRIPTED" "AGENT_SITTING" "AGENT_TYPING" "AGENT_WALKING" "ALL_SIDES" "ANIM_ON" "ATTACH_AVATAR_CENTER" "ATTACH_BACK" "ATTACH_BELLY" "ATTACH_CHEST" "ATTACH_CHIN" "ATTACH_HEAD" "ATTACH_HUD_BOTTOM" "ATTACH_HUD_BOTTOM_LEFT" "ATTACH_HUD_BOTTOM_RIGHT" "ATTACH_HUD_CENTER_1" "ATTACH_HUD_CENTER_2" "ATTACH_HUD_TOP_CENTER" "ATTACH_HUD_TOP_LEFT" "ATTACH_HUD_TOP_RIGHT" "ATTACH_LEAR" "ATTACH_LEFT_PEC" "ATTACH_LEYE" "ATTACH_LFOOT" "ATTACH_LHAND" "ATTACH_LHIP" "ATTACH_LLARM" "ATTACH_LLLEG" "ATTACH_LPEC" "ATTACH_LSHOULDER" "ATTACH_LUARM" "ATTACH_LULEG" "ATTACH_MOUTH" "ATTACH_NECK" "ATTACH_NOSE" "ATTACH_PELVIS" "ATTACH_REAR" "ATTACH_REYE" "ATTACH_RFOOT" "ATTACH_RHAND" "ATTACH_RHIP" "ATTACH_RIGHT_PEC" "ATTACH_RLARM" "ATTACH_RLLEG" "ATTACH_RPEC" "ATTACH_RSHOULDER" "ATTACH_RUARM" "ATTACH_RULEG" "AVOID_CHARACTERS" "AVOID_DYNAMIC_OBSTACLES" "AVOID_NONE" "CAMERA_ACTIVE" "CAMERA_BEHINDNESS_ANGLE" "CAMERA_BEHINDNESS_LAG" "CAMERA_DISTANCE" "CAMERA_FOCUS" "CAMERA_FOCUS_LAG" "CAMERA_FOCUS_LOCKED" "CAMERA_FOCUS_OFFSET" "CAMERA_FOCUS_THRESHOLD" "CAMERA_PITCH" "CAMERA_POSITION" "CAMERA_POSITION_LAG" "CAMERA_POSITION_LOCKED" "CAMERA_POSITION_THRESHOLD" "CHANGED_ALLOWED_DROP" "CHANGED_COLOR" "CHANGED_INVENTORY" "CHANGED_LINK" "CHANGED_MEDIA" "CHANGED_OWNER" "CHANGED_REGION" "CHANGED_REGION_START" "CHANGED_SCALE" "CHANGED_SHAPE" "CHANGED_TELEPORT" "CHANGED_TEXTURE" "CHARACTER_ACCOUNT_FOR_SKIPPED_FRAMES" "CHARACTER_AVOIDANCE_MODE" "CHARACTER_CMD_JUMP" "CHARACTER_CMD_SMOOTH_STOP" "CHARACTER_CMD_STOP" "CHARACTER_DESIRED_SPEED" "CHARACTER_DESIRED_TURN_SPEED" "CHARACTER_LENGTH" "CHARACTER_MAX_ACCEL" "CHARACTER_MAX_DECEL" "CHARACTER_MAX_SPEED" "CHARACTER_MAX_TURN_RADIUS" "CHARACTER_ORIENTATION" "CHARACTER_RADIUS" "CHARACTER_TYPE" "CHARACTER_TYPE_A" "CHARACTER_TYPE_B" "CHARACTER_TYPE_C" "CHARACTER_TYPE_D" "CHARACTER_TYPE_NONE" "CLICK_ACTION_BUY" "CLICK_ACTION_NONE" "CLICK_ACTION_OPEN" "CLICK_ACTION_OPEN_MEDIA" "CLICK_ACTION_PAY" "CLICK_ACTION_PLAY" "CLICK_ACTION_SIT" "CLICK_ACTION_TOUCH" "CONTENT_TYPE_HTML" "CONTENT_TYPE_TEXT" "CONTROL_BACK" "CONTROL_DOWN" "CONTROL_FWD" "CONTROL_LBUTTON" "CONTROL_LEFT" "CONTROL_ML_LBUTTON" "CONTROL_RIGHT" "CONTROL_ROT_LEFT" "CONTROL_ROT_RIGHT" "CONTROL_UP" "DATA_BORN" "DATA_NAME" "DATA_ONLINE" "DATA_PAYINFO" "DATA_RATING" "DATA_SIM_POS" "DATA_SIM_RATING" "DATA_SIM_STATUS" "DEBUG_CHANNEL" "DEG_TO_RAD" "DENSITY" "EOF" "ESTATE_ACCESS_ALLOWED_AGENT_ADD" "ESTATE_ACCESS_ALLOWED_AGENT_REMOVE" "ESTATE_ACCESS_ALLOWED_GROUP_ADD" "ESTATE_ACCESS_ALLOWED_GROUP_REMOVE" "ESTATE_ACCESS_BANNED_AGENT_ADD" "ESTATE_ACCESS_BANNED_AGENT_REMOVE" "FALSE" "FORCE_DIRECT_PATH" "FRICTION" "GCNP_RADIUS" "GCNP_STATIC" "GRAVITY_MULTIPLIER" "HORIZONTAL" "HTTP_BODY_MAXLENGTH" "HTTP_BODY_TRUNCATED" "HTTP_METHOD" "HTTP_MIMETYPE" "HTTP_PRAGMA_NO_CACHE" "HTTP_VERBOSE_THROTTLE" "HTTP_VERIFY_CERT" "INVENTORY_ALL" "INVENTORY_ANIMATION" "INVENTORY_BODYPART" "INVENTORY_CLOTHING" "INVENTORY_GESTURE" "INVENTORY_LANDMARK" "INVENTORY_NONE" "INVENTORY_NOTECARD" "INVENTORY_OBJECT" "INVENTORY_SCRIPT" "INVENTORY_SOUND" "INVENTORY_TEXTURE" "KFM_CMD_PAUSE" "KFM_CMD_PLAY" "KFM_CMD_SET_MODE" "KFM_CMD_STOP" "KFM_COMMAND" "KFM_DATA" "KFM_FORWARD" "KFM_LOOP" "KFM_MODE" "KFM_PING_PONG" "KFM_REVERSE" "KFM_ROTATION" "KFM_TRANSLATION" "LAND_LARGE_BRUSH" "LAND_LEVEL" "LAND_LOWER" "LAND_MEDIUM_BRUSH" "LAND_NOISE" "LAND_RAISE" "LAND_REVERT" "LAND_SMALL_BRUSH" "LAND_SMOOTH" "LINK_ALL_CHILDREN" "LINK_ALL_OTHERS" "LINK_ROOT" "LINK_SET" "LINK_THIS" "LIST_STAT_GEOMETRIC_MEAN" "LIST_STAT_MAX" "LIST_STAT_MEAN" "LIST_STAT_MEDIAN" "LIST_STAT_MIN" "LIST_STAT_NUM_COUNT" "LIST_STAT_RANGE" "LIST_STAT_STD_DEV" "LIST_STAT_SUM" "LIST_STAT_SUM_SQUARES" "LOOP" "MASK_BASE" "MASK_EVERYONE" "MASK_GROUP" "MASK_NEXT" "MASK_OWNER" "NULL_KEY" "OBJECT_ATTACHED_POINT" "OBJECT_CHARACTER_TIME" "OBJECT_CREATOR" "OBJECT_DESC" "OBJECT_GROUP" "OBJECT_NAME" "OBJECT_OWNER" "OBJECT_PATHFINDING_TYPE" "OBJECT_PHANTOM" "OBJECT_PHYSICS" "OBJECT_PHYSICS_COST" "OBJECT_POS" "OBJECT_PRIM_EQUIVALENCE" "OBJECT_ROOT" "OBJECT_ROT" "OBJECT_RUNNING_SCRIPT_COUNT" "OBJECT_SCRIPT_MEMORY" "OBJECT_SCRIPT_TIME" "OBJECT_SERVER_COST" "OBJECT_STREAMING_COST" "OBJECT_TEMP_ON_REZ" "OBJECT_TOTAL_SCRIPT_COUNT" "OBJECT_UNKNOWN_DETAIL" "OBJECT_VELOCITY" "OPT_AVATAR" "OPT_CHARACTER" "OPT_EXCLUSION_VOLUME" "OPT_LEGACY_LINKSET" "OPT_MATERIAL_VOLUME" "OPT_OTHER" "OPT_STATIC_OBSTACLE" "OPT_WALKABLE" "PARCEL_COUNT_GROUP" "PARCEL_COUNT_OTHER" "PARCEL_COUNT_OWNER" "PARCEL_COUNT_SELECTED" "PARCEL_COUNT_TEMP" "PARCEL_COUNT_TOTAL" "PARCEL_DETAILS_AREA" "PARCEL_DETAILS_DESC" "PARCEL_DETAILS_GROUP" "PARCEL_DETAILS_ID" "PARCEL_DETAILS_NAME" "PARCEL_DETAILS_OWNER" "PARCEL_DETAILS_SEE_AVATARS" "PARCEL_FLAG_ALLOW_ALL_OBJECT_ENTRY" "PARCEL_FLAG_ALLOW_CREATE_GROUP_OBJECTS" "PARCEL_FLAG_ALLOW_CREATE_OBJECTS" "PARCEL_FLAG_ALLOW_DAMAGE" "PARCEL_FLAG_ALLOW_FLY" "PARCEL_FLAG_ALLOW_GROUP_OBJECT_ENTRY" "PARCEL_FLAG_ALLOW_GROUP_SCRIPTS" "PARCEL_FLAG_ALLOW_LANDMARK" "PARCEL_FLAG_ALLOW_SCRIPTS" "PARCEL_FLAG_ALLOW_TERRAFORM" "PARCEL_FLAG_LOCAL_SOUND_ONLY" "PARCEL_FLAG_RESTRICT_PUSHOBJECT" "PARCEL_FLAG_USE_ACCESS_GROUP" "PARCEL_FLAG_USE_ACCESS_LIST" "PARCEL_FLAG_USE_BAN_LIST" "PARCEL_FLAG_USE_LAND_PASS_LIST" "PARCEL_MEDIA_COMMAND_AGENT" "PARCEL_MEDIA_COMMAND_AUTO_ALIGN" "PARCEL_MEDIA_COMMAND_DESC" "PARCEL_MEDIA_COMMAND_LOOP" "PARCEL_MEDIA_COMMAND_LOOP_SET" "PARCEL_MEDIA_COMMAND_PAUSE" "PARCEL_MEDIA_COMMAND_PLAY" "PARCEL_MEDIA_COMMAND_SIZE" "PARCEL_MEDIA_COMMAND_STOP" "PARCEL_MEDIA_COMMAND_TEXTURE" "PARCEL_MEDIA_COMMAND_TIME" "PARCEL_MEDIA_COMMAND_TYPE" "PARCEL_MEDIA_COMMAND_UNLOAD" "PARCEL_MEDIA_COMMAND_URL" "PASSIVE" "PATROL_PAUSE_AT_WAYPOINTS" "PAYMENT_INFO_ON_FILE" "PAYMENT_INFO_USED" "PAY_DEFAULT" "PAY_HIDE" "PERMISSION_ATTACH" "PERMISSION_CHANGE_JOINTS" "PERMISSION_CHANGE_LINKS" "PERMISSION_CHANGE_PERMISSIONS" "PERMISSION_CONTROL_CAMERA" "PERMISSION_DEBIT" "PERMISSION_RELEASE_OWNERSHIP" "PERMISSION_REMAP_CONTROLS" "PERMISSION_SILENT_ESTATE_MANAGEMENT" "PERMISSION_TAKE_CONTROLS" "PERMISSION_TELEPORT" "PERMISSION_TRACK_CAMERA" "PERMISSION_TRIGGER_ANIMATION" "PERM_ALL" "PERM_COPY" "PERM_MODIFY" "PERM_MOVE" "PERM_TRANSFER" "PI" "PING_PONG" "PI_BY_TWO" "PRIM_BUMP_BARK" "PRIM_BUMP_BLOBS" "PRIM_BUMP_BRICKS" "PRIM_BUMP_BRIGHT" "PRIM_BUMP_CHECKER" "PRIM_BUMP_CONCRETE" "PRIM_BUMP_DARK" "PRIM_BUMP_DISKS" "PRIM_BUMP_GRAVEL" "PRIM_BUMP_LARGETILE" "PRIM_BUMP_NONE" "PRIM_BUMP_SHINY" "PRIM_BUMP_SIDING" "PRIM_BUMP_STONE" "PRIM_BUMP_STUCCO" "PRIM_BUMP_SUCTION" "PRIM_BUMP_TILE" "PRIM_BUMP_WEAVE" "PRIM_BUMP_WOOD" "PRIM_CAST_SHADOWS" "PRIM_COLOR" "PRIM_DESC" "PRIM_FLEXIBLE" "PRIM_FULLBRIGHT" "PRIM_GLOW" "PRIM_HOLE_CIRCLE" "PRIM_HOLE_DEFAULT" "PRIM_HOLE_SQUARE" "PRIM_HOLE_TRIANGLE" "PRIM_LINK_TARGET" "PRIM_MATERIAL" "PRIM_MATERIAL_FLESH" "PRIM_MATERIAL_GLASS" "PRIM_MATERIAL_LIGHT" "PRIM_MATERIAL_METAL" "PRIM_MATERIAL_PLASTIC" "PRIM_MATERIAL_RUBBER" "PRIM_MATERIAL_STONE" "PRIM_MATERIAL_WOOD" "PRIM_MEDIA_ALT_IMAGE_ENABLE" "PRIM_MEDIA_AUTO_LOOP" "PRIM_MEDIA_AUTO_PLAY" "PRIM_MEDIA_AUTO_SCALE" "PRIM_MEDIA_AUTO_ZOOM" "PRIM_MEDIA_CONTROLS" "PRIM_MEDIA_CONTROLS_MINI" "PRIM_MEDIA_CONTROLS_STANDARD" "PRIM_MEDIA_CURRENT_URL" "PRIM_MEDIA_FIRST_CLICK_INTERACT" "PRIM_MEDIA_HEIGHT_PIXELS" "PRIM_MEDIA_HOME_URL" "PRIM_MEDIA_MAX_HEIGHT_PIXELS" "PRIM_MEDIA_MAX_URL_LENGTH" "PRIM_MEDIA_MAX_WHITELIST_COUNT" "PRIM_MEDIA_MAX_WHITELIST_SIZE" "PRIM_MEDIA_MAX_WIDTH_PIXELS" "PRIM_MEDIA_PARAM_MAX" "PRIM_MEDIA_PERMS_CONTROL" "PRIM_MEDIA_PERMS_INTERACT" "PRIM_MEDIA_PERM_ANYONE" "PRIM_MEDIA_PERM_GROUP" "PRIM_MEDIA_PERM_NONE" "PRIM_MEDIA_PERM_OWNER" "PRIM_MEDIA_WHITELIST" "PRIM_MEDIA_WHITELIST_ENABLE" "PRIM_MEDIA_WIDTH_PIXELS" "PRIM_NAME" "PRIM_OMEGA" "PRIM_PHANTOM" "PRIM_PHYSICS" "PRIM_PHYSICS_SHAPE_CONVEX" "PRIM_PHYSICS_SHAPE_NONE" "PRIM_PHYSICS_SHAPE_PRIM" "PRIM_PHYSICS_SHAPE_TYPE" "PRIM_POINT_LIGHT" "PRIM_POSITION" "PRIM_POS_LOCAL" "PRIM_ROTATION" "PRIM_ROT_LOCAL" "PRIM_SCULPT_FLAG_INVERT" "PRIM_SCULPT_FLAG_MIRROR" "PRIM_SCULPT_TYPE_CYLINDER" "PRIM_SCULPT_TYPE_MASK" "PRIM_SCULPT_TYPE_PLANE" "PRIM_SCULPT_TYPE_SPHERE" "PRIM_SCULPT_TYPE_TORUS" "PRIM_SHINY_HIGH" "PRIM_SHINY_LOW" "PRIM_SHINY_MEDIUM" "PRIM_SHINY_NONE" "PRIM_SIZE" "PRIM_SLICE" "PRIM_TEMP_ON_REZ" "PRIM_TEXGEN" "PRIM_TEXGEN_DEFAULT" "PRIM_TEXGEN_PLANAR" "PRIM_TEXT" "PRIM_TEXTURE" "PRIM_TYPE" "PRIM_TYPE_BOX" "PRIM_TYPE_CYLINDER" "PRIM_TYPE_PRISM" "PRIM_TYPE_RING" "PRIM_TYPE_SCULPT" "PRIM_TYPE_SPHERE" "PRIM_TYPE_TORUS" "PRIM_TYPE_TUBE" "PROFILE_NONE" "PROFILE_SCRIPT_MEMORY" "PSYS_PART_BOUNCE_MASK" "PSYS_PART_EMISSIVE_MASK" "PSYS_PART_END_ALPHA" "PSYS_PART_END_COLOR" "PSYS_PART_END_SCALE" "PSYS_PART_FLAGS" "PSYS_PART_FOLLOW_SRC_MASK" "PSYS_PART_FOLLOW_VELOCITY_MASK" "PSYS_PART_INTERP_COLOR_MASK" "PSYS_PART_INTERP_SCALE_MASK" "PSYS_PART_MAX_AGE" "PSYS_PART_START_ALPHA" "PSYS_PART_START_COLOR" "PSYS_PART_START_SCALE" "PSYS_PART_TARGET_LINEAR_MASK" "PSYS_PART_TARGET_POS_MASK" "PSYS_PART_WIND_MASK" "PSYS_SRC_ACCEL" "PSYS_SRC_ANGLE_BEGIN" "PSYS_SRC_ANGLE_END" "PSYS_SRC_BURST_PART_COUNT" "PSYS_SRC_BURST_RADIUS" "PSYS_SRC_BURST_RATE" "PSYS_SRC_BURST_SPEED_MAX" "PSYS_SRC_BURST_SPEED_MIN" "PSYS_SRC_INNERANGLE" "PSYS_SRC_MAX_AGE" "PSYS_SRC_OBJ_REL_MASK" "PSYS_SRC_OMEGA" "PSYS_SRC_OUTERANGLE" "PSYS_SRC_PATTERN" "PSYS_SRC_PATTERN_ANGLE" "PSYS_SRC_PATTERN_ANGLE_CONE" "PSYS_SRC_PATTERN_ANGLE_CONE_EMPTY" "PSYS_SRC_PATTERN_DROP" "PSYS_SRC_PATTERN_EXPLODE" "PSYS_SRC_TARGET_KEY" "PSYS_SRC_TEXTURE" "PUBLIC_CHANNEL" "PURSUIT_FUZZ_FACTOR" "PURSUIT_GOAL_TOLERANCE" "PURSUIT_INTERCEPT" "PURSUIT_OFFSET" "PU_EVADE_HIDDEN" "PU_EVADE_SPOTTED" "PU_FAILURE_DYNAMIC_PATHFINDING_DISABLED" "PU_FAILURE_INVALID_GOAL" "PU_FAILURE_INVALID_START" "PU_FAILURE_NO_NAVMESH" "PU_FAILURE_NO_VALID_DESTINATION" "PU_FAILURE_OTHER" "PU_FAILURE_PARCEL_UNREACHABLE" "PU_FAILURE_TARGET_GONE" "PU_FAILURE_UNREACHABLE" "PU_GOAL_REACHED" "PU_SLOWDOWN_DISTANCE_REACHED" "RAD_TO_DEG" "RCERR_CAST_TIME_EXCEEDED" "RCERR_SIM_PERF_LOW" "RCERR_UNKNOWN" "RC_DATA_FLAGS" "RC_DETECT_PHANTOM" "RC_GET_LINK_NUM" "RC_GET_NORMAL" "RC_GET_ROOT_KEY" "RC_MAX_HITS" "RC_REJECT_AGENTS" "RC_REJECT_LAND" "RC_REJECT_NONPHYSICAL" "RC_REJECT_PHYSICAL" "RC_REJECT_TYPES" "REGION_FLAG_ALLOW_DAMAGE" "REGION_FLAG_ALLOW_DIRECT_TELEPORT" "REGION_FLAG_BLOCK_FLY" "REGION_FLAG_BLOCK_TERRAFORM" "REGION_FLAG_DISABLE_COLLISIONS" "REGION_FLAG_DISABLE_PHYSICS" "REGION_FLAG_FIXED_SUN" "REGION_FLAG_RESTRICT_PUSHOBJECT" "REGION_FLAG_SANDBOX" "REMOTE_DATA_CHANNEL" "REMOTE_DATA_REPLY" "REMOTE_DATA_REQUEST" "REQUIRE_LINE_OF_SIGHT" "RESTITUTION" "REVERSE" "ROTATE" "SCALE" "SCRIPTED" "SIM_STAT_PCT_CHARS_STEPPED" "SMOOTH" "SQRT2" "STATUS_BLOCK_GRAB" "STATUS_BLOCK_GRAB_OBJECT" "STATUS_BOUNDS_ERROR" "STATUS_CAST_SHADOWS" "STATUS_DIE_AT_EDGE" "STATUS_INTERNAL_ERROR" "STATUS_MALFORMED_PARAMS" "STATUS_NOT_FOUND" "STATUS_NOT_SUPPORTED" "STATUS_OK" "STATUS_PHANTOM" "STATUS_PHYSICS" "STATUS_RETURN_AT_EDGE" "STATUS_ROTATE_X" "STATUS_ROTATE_Y" "STATUS_ROTATE_Z" "STATUS_SANDBOX" "STATUS_TYPE_MISMATCH" "STATUS_WHITELIST_FAILED" "STRING_TRIM" "STRING_TRIM_HEAD" "STRING_TRIM_TAIL" "TEXTURE_BLANK" "TEXTURE_DEFAULT" "TEXTURE_MEDIA" "TEXTURE_PLYWOOD" "TEXTURE_TRANSPARENT" "TOUCH_INVALID_FACE" "TOUCH_INVALID_TEXCOORD" "TOUCH_INVALID_VECTOR" "TRAVERSAL_TYPE" "TRAVERSAL_TYPE_FAST" "TRAVERSAL_TYPE_NONE" "TRAVERSAL_TYPE_SLOW" "TRUE" "TWO_PI" "TYPE_FLOAT" "TYPE_INTEGER" "TYPE_INVALID" "TYPE_KEY" "TYPE_ROTATION" "TYPE_STRING" "TYPE_VECTOR" "URL_REQUEST_DENIED" "URL_REQUEST_GRANTED" "VEHICLE_ANGULAR_DEFLECTION_EFFICIENCY" "VEHICLE_ANGULAR_DEFLECTION_TIMESCALE" "VEHICLE_ANGULAR_FRICTION_TIMESCALE" "VEHICLE_ANGULAR_MOTOR_DECAY_TIMESCALE" "VEHICLE_ANGULAR_MOTOR_DIRECTION" "VEHICLE_ANGULAR_MOTOR_TIMESCALE" "VEHICLE_BANKING_EFFICIENCY" "VEHICLE_BANKING_MIX" "VEHICLE_BANKING_TIMESCALE" "VEHICLE_BUOYANCY" "VEHICLE_FLAG_CAMERA_DECOUPLED" "VEHICLE_FLAG_HOVER_GLOBAL_HEIGHT" "VEHICLE_FLAG_HOVER_TERRAIN_ONLY" "VEHICLE_FLAG_HOVER_UP_ONLY" "VEHICLE_FLAG_HOVER_WATER_ONLY" "VEHICLE_FLAG_LIMIT_MOTOR_UP" "VEHICLE_FLAG_LIMIT_ROLL_ONLY" "VEHICLE_FLAG_MOUSELOOK_BANK" "VEHICLE_FLAG_MOUSELOOK_STEER" "VEHICLE_FLAG_NO_DEFLECTION_UP" "VEHICLE_FLAG_NO_FLY_UP" "VEHICLE_HOVER_EFFICIENCY" "VEHICLE_HOVER_HEIGHT" "VEHICLE_HOVER_TIMESCALE" "VEHICLE_LINEAR_DEFLECTION_EFFICIENCY" "VEHICLE_LINEAR_DEFLECTION_TIMESCALE" "VEHICLE_LINEAR_FRICTION_TIMESCALE" "VEHICLE_LINEAR_MOTOR_DECAY_TIMESCALE" "VEHICLE_LINEAR_MOTOR_DIRECTION" "VEHICLE_LINEAR_MOTOR_OFFSET" "VEHICLE_LINEAR_MOTOR_TIMESCALE" "VEHICLE_REFERENCE_FRAME" "VEHICLE_TYPE_AIRPLANE" "VEHICLE_TYPE_BALLOON" "VEHICLE_TYPE_BOAT" "VEHICLE_TYPE_CAR" "VEHICLE_TYPE_NONE" "VEHICLE_TYPE_SLED" "VEHICLE_VERTICAL_ATTRACTION_EFFICIENCY" "VEHICLE_VERTICAL_ATTRACTION_TIMESCALE" "VERTICAL" "WANDER_PAUSE_AT_WAYPOINTS" "ZERO_ROTATION" "ZERO_VECTOR")
 "LSL constants."
  :type 'list
  :group 'lsl-font-lock)

(defcustom lsl-events
  '( "at_rot_target" "at_target" "attach" "changed" "collision" "collision_end" "collision_start" "control" "dataserver" "email" "http_request" "http_response" "land_collision" "land_collision_end" "land_collision_start" "link_message" "listen" "money" "moving_end" "moving_start" "no_sensor" "not_at_rot_target" "not_at_target" "object_rez" "on_rez" "path_update" "remote_data" "run_time_permissions" "sensor" "state_entry" "state_exit" "timer" "touch" "touch_end" "touch_start" "transaction_result")
  "LSL events."
  :type 'list
  :group 'lsl-font-lock)

(defvar lsl-builtin-regexp "\\<ll[A-Z][a-zA-Z]+\\>")
(defvar lsl-keywords-regexp (regexp-opt lsl-keywords 'words))
(defvar lsl-type-regexp (regexp-opt lsl-types 'words))
(defvar lsl-constant-regexp (regexp-opt lsl-constants 'words))
(defvar lsl-event-regexp (regexp-opt lsl-events 'words))
(defvar lsl-variable-name-regexp
  (concat "\\<integer\\>" "\\s+\\(\\<foo\\s +bar\\>\\)"))

(setq lsl-font-lock-keywords
  `(,lsl-keywords-regexp
    (,lsl-type-regexp . font-lock-type-face)
    ("\\(\\<\\S +\\>\\)\\s *(" 1 font-lock-function-name-face t)
    (,lsl-event-regexp 0 font-lock-builtin-face t)
    (,lsl-builtin-regexp 0 font-lock-builtin-face t)
    (,(concat lsl-type-regexp "\\W+\\(\\<\\w+\\>\\)") 2 font-lock-variable-name-face)
    (,lsl-constant-regexp . font-lock-constant-face)))

(define-derived-mode lsl-mode c-mode "LSL"
;;(define-derived-mode lsl-mode c++-mode "LSL"
  "Major mode for editing LSL.
\\{lsl-mode-map}"
  (setq font-lock-defaults '((lsl-font-lock-keywords) nil nil)))

(provide 'lsl-mode)

Another lsl mode, xlsl-mode by Xah Lee is available at http://xahlee.org/sl/ls-emacs.html

This mode supports syntax coloring, comment/uncomment, reference lookup. It also support syntax checking with lslint and function templates insertion with yasnippet.