gudusoft.gsqlparser.parser

Class DaxSqlParser

Object

gudusoft.gsqlparser.parser.AbstractSqlParser

gudusoft.gsqlparser.parser.DaxSqlParser

All Implemented Interfaces:

SqlParser

public class DaxSqlParser
extends AbstractSqlParser

DAX (Data Analysis Expressions) database SQL parser implementation.

This parser handles DAX-specific SQL syntax including:

• DAX expressions starting with '=' at beginning of line
• DEFINE...EVALUATE statements
• EVALUATE statements
• DAX function calls and expressions
• Special handling of DAX keywords (PRODUCT, TRUE, FALSE, CALENDAR, SECOND)

Design Notes:

• Extends AbstractSqlParser using the template method pattern
• Uses TLexerDax for tokenization
• Uses TParserDax for parsing
• Delimiter character: ';' for DAX statements

Usage Example:

 // Get DAX parser from factory
 SqlParser parser = SqlParserFactory.get(EDbVendor.dbvdax);

 // Build context
 ParserContext context = new ParserContext.Builder(EDbVendor.dbvdax)
     .sqlText("= CALCULATE(SUM(Sales[Amount]), ALL(Sales))")
     .build();

 // Parse
 SqlParseResult result = parser.parse(context);

 // Access statements
 TStatementList statements = result.getSqlStatements();
 

Since:

3.3.1

See Also:

SqlParser, AbstractSqlParser, TLexerDax, TParserDax

Nested Class Summary

Nested classes/interfaces inherited from class gudusoft.gsqlparser.parser.AbstractSqlParser

AbstractSqlParser.PreparedSqlReader

Field Summary

Fields

Modifier and Type	Field and Description
TLexerDax	flexer The DAX lexer used for tokenization

Fields inherited from class gudusoft.gsqlparser.parser.AbstractSqlParser

defaultDelimiterStr, delimiterChar, frameStack, globalContext, globalFrame, lexer, parserContext, sourcetokenlist, sqlcmds, sqlEnv, sqlstatements, syntaxErrors, vendor

Constructor Summary

Constructors

Constructor and Description
DaxSqlParser() Construct DAX SQL parser.

Method Summary

Modifier and Type	Method and Description
protected void	extractVendorRawStatements(SqlParseResult.Builder builder) Call DAX-specific raw statement extraction logic.
protected TCustomLexer	getLexer(ParserContext context) Return the DAX lexer instance.
protected TCustomParser	getParser(ParserContext context, TSourceTokenList tokens) Return the DAX SQL parser instance with updated token list.
protected TCustomParser	getSecondaryParser(ParserContext context, TSourceTokenList tokens) DAX does not use a secondary parser.
protected TStatementList	performParsing(ParserContext context, TCustomParser parser, TCustomParser secondaryParser, TSourceTokenList tokens, TStatementList rawStatements) Parse all raw DAX statements.
protected void	setupVendorParsersForExtraction() Setup DAX parser for raw statement extraction.
protected void	tokenizeVendorSql() Call DAX-specific tokenization logic.

Methods inherited from class gudusoft.gsqlparser.parser.AbstractSqlParser

afterStatementParsed, attemptErrorRecovery, copyErrorsFromStatement, doAfterTokenize, doExtractRawStatements, extractRawStatements, getanewsourcetoken, getDefaultDelimiterStr, getDelimiterChar, getErrorCount, getrawsqlstatements, getSyntaxErrors, getVendor, handleStatementParsingException, initializeGlobalContext, isDollarFunctionDelimiter, onRawStatementComplete, onRawStatementCompleteVendorSpecific, parse, performInterpreter, performSemanticAnalysis, performTokenization, prepareSqlReader, processTokensBeforeParse, processTokensInTokenTable, setTokenHandle, tokenize, toString, towinlinebreak

Methods inherited from class Object

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

Field Detail

flexer

public TLexerDax flexer

The DAX lexer used for tokenization

Constructor Detail

DaxSqlParser

public DaxSqlParser()

Construct DAX SQL parser.

Configures the parser for DAX database with default delimiter (;).

Following the original TGSqlParser pattern, the lexer and parser are created once in the constructor and reused for all parsing operations.

Method Detail

getLexer

protected TCustomLexer getLexer(ParserContext context)

Return the DAX lexer instance.

Specified by:

getLexer in class AbstractSqlParser

Parameters:

context - the parser context

Returns:

configured lexer instance (never null)

getParser

protected TCustomParser getParser(ParserContext context,
                                  TSourceTokenList tokens)

Return the DAX SQL parser instance with updated token list.

Specified by:

getParser in class AbstractSqlParser

Parameters:

context - the parser context

tokens - the source token list

Returns:

configured parser instance (never null)

getSecondaryParser

protected TCustomParser getSecondaryParser(ParserContext context,
                                           TSourceTokenList tokens)

DAX does not use a secondary parser.

Overrides:

getSecondaryParser in class AbstractSqlParser

Parameters:

context - the parser context

tokens - the source token list

Returns:

null (no secondary parser)

tokenizeVendorSql

protected void tokenizeVendorSql()

Call DAX-specific tokenization logic.

Delegates to dodaxsqltexttotokenlist which handles DAX's simple token iteration.

Specified by:

tokenizeVendorSql in class AbstractSqlParser

setupVendorParsersForExtraction

protected void setupVendorParsersForExtraction()

Setup DAX parser for raw statement extraction.

Injects shared state (sqlcmds, sourcetokenlist) into the DAX parser so it can access tokens and SQL command definitions during parsing.

Specified by:

setupVendorParsersForExtraction in class AbstractSqlParser

extractVendorRawStatements

protected void extractVendorRawStatements(SqlParseResult.Builder builder)

Call DAX-specific raw statement extraction logic.

Delegates to dodaxgetrawsqlstatements which handles DAX's statement boundary detection (based on nested parentheses and special DAX keywords).

Specified by:

extractVendorRawStatements in class AbstractSqlParser

Parameters:

builder - the result builder to populate with raw statements

performParsing

protected TStatementList performParsing(ParserContext context,
                                        TCustomParser parser,
                                        TCustomParser secondaryParser,
                                        TSourceTokenList tokens,
                                        TStatementList rawStatements)

Parse all raw DAX statements.

Iterates through all raw statements extracted by dodaxgetrawsqlstatements() and parses each one using the DAX parser.

Follows the pattern from MssqlSqlParser.performParsing()

Specified by:

performParsing in class AbstractSqlParser

Parameters:

context - the parser context

parser - the main parser instance

secondaryParser - secondary parser (may be null)

tokens - the source token list

rawStatements - raw statements already extracted (never null)

Returns:

statement list with parsed AST (never null)