wip on rain string

.gitmodules

@@ -19,3 +19,6 @@
 [submodule "lib/rain.math.float"]
 	path = lib/rain.math.float
 	url = https://github.com/rainlanguage/rain.math.float
+[submodule "lib/rain.string"]
+	path = lib/rain.string
+	url = https://github.com/rainlanguage/rain.string

src/abstract/BaseRainterpreterSubParserNPE2.sol

@@ -7,7 +7,7 @@ import {LibBytes, Pointer} from "rain.solmem/lib/LibBytes.sol";
 import {ISubParserV3, AuthoringMetaV2} from "rain.interpreter.interface/interface/ISubParserV3.sol";
 import {IncompatibleSubParser} from "../error/ErrSubParse.sol";
 import {LibSubParse, ParseState, CURRENT_COMPATIBILITY} from "../lib/parse/LibSubParse.sol";
-import {CMASK_RHS_WORD_TAIL} from "../lib/parse/LibParseCMask.sol";
+import {CMASK_RHS_WORD_TAIL} from "rain.string/lib/parse/LibParseCMask.sol";
 import {LibParse, Operand} from "../lib/parse/LibParse.sol";
 import {LibParseMeta} from "rain.interpreter.interface/lib/parse/LibParseMeta.sol";
 import {LibParseOperand} from "../lib/parse/LibParseOperand.sol";

src/lib/parse/LibParse.sol

@@ -19,7 +19,8 @@ import {
     COMMENT_START_SEQUENCE,
     COMMENT_END_SEQUENCE,
     CMASK_IDENTIFIER_HEAD
-} from "./LibParseCMask.sol";
+} from "rain.string/lib/parse/LibParseCMask.sol";
+import {LibParseChars} from "rain.string/lib/parse/LibParseChars.sol";
 import {LibCtPop} from "rain.math.binary/lib/LibCtPop.sol";
 import {LibParseMeta} from "rain.interpreter.interface/lib/parse/LibParseMeta.sol";
 import {LibParseLiteral} from "./literal/LibParseLiteral.sol";
@@ -121,25 +122,6 @@ library LibParse {
         }
     }
 
-    /// Skip an unlimited number of chars until we find one that is not in the
-    /// mask.
-    function skipMask(uint256 cursor, uint256 end, uint256 mask) internal pure returns (uint256) {
-        assembly ("memory-safe") {
-            //slither-disable-next-line incorrect-shift
-            for {} and(lt(cursor, end), gt(and(shl(byte(0, mload(cursor)), 1), mask), 0)) { cursor := add(cursor, 1) } {}
-        }
-        return cursor;
-    }
-
-    /// Checks if the cursor points at a char of the given mask, and is in range
-    /// of end.
-    function isMask(uint256 cursor, uint256 end, uint256 mask) internal pure returns (uint256 result) {
-        assembly ("memory-safe") {
-            //slither-disable-next-line incorrect-shift
-            result := and(lt(cursor, end), iszero(iszero(and(shl(byte(0, mload(cursor)), 1), mask))))
-        }
-    }
-
     function parseLHS(ParseState memory state, uint256 cursor, uint256 end) internal pure returns (uint256) {
         unchecked {
             while (cursor < end) {