refactor to subcrates

crates/nu-parser/src/lib.rs

@@ -0,0 +1,24 @@
+mod declaration;
+mod errors;
+mod flatten;
+mod lex;
+mod lite_parse;
+mod parse_error;
+mod parser;
+mod parser_state;
+mod signature;
+mod span;
+mod type_check;
+
+pub use declaration::Declaration;
+pub use flatten::FlatShape;
+pub use lex::{lex, Token, TokenContents};
+pub use lite_parse::{lite_parse, LiteBlock};
+pub use parse_error::ParseError;
+pub use parser::{
+    span, Block, Call, Expr, Expression, Import, Operator, Pipeline, Statement, SyntaxShape,
+    VarDecl,
+};
+pub use parser_state::{BlockId, DeclId, ParserDelta, ParserState, ParserWorkingSet, Type, VarId};
+pub use signature::{Flag, PositionalArg, Signature};
+pub use span::Span;