gudusoft.gsqlparser.parser.powerquery

Class PowerQueryDocumentParser

Object

gudusoft.gsqlparser.parser.powerquery.PowerQueryDocumentParser

public class PowerQueryDocumentParser
extends Object

Hand-written recursive-style parser that walks an M-language token list (produced by PowerQueryTokenizer) and builds the step graph rooted at TPowerQueryLetExpr.

This is intentionally a lightweight parser, not a full M-language parser. It answers exactly the 6 questions the plan calls out:

1. What are the let bindings?
2. Which binding is returned by in?
3. Does a binding contain Value.NativeQuery? → extract SQL, decode escapes
4. Does a binding represent a navigation chain to a table/view?
5. What connector function is at the root?
6. Which bindings reference other bindings?

Anything else (each, closures, type ascription, metadata, etc.) is swallowed by skipExpression() which advances past a balanced token sequence. A warning is emitted when an expression cannot be classified into one of the lineage-bearing shapes.

Constructor Summary

Constructors

Constructor and Description
PowerQueryDocumentParser(List<TSourceToken> tokens)

Method Summary

Modifier and Type	Method and Description
List<String>	getWarnings()
TPowerQueryLetExpr	parse() Parse the token list as a complete M document.

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

PowerQueryDocumentParser

public PowerQueryDocumentParser(List<TSourceToken> tokens)

Method Detail

getWarnings

public List<String> getWarnings()

parse

public TPowerQueryLetExpr parse()

Parse the token list as a complete M document. Returns the resulting TPowerQueryLetExpr or null if the document is not a let ... in ... shape and nothing can be extracted.