feat: full BaraQL (GROUP BY/JOIN/CTE/aggregates), Raft consensus, sharding — 107 tests
BaraQL parser extended: - GROUP BY + HAVING clauses - JOIN (INNER, LEFT, RIGHT, FULL, CROSS) with ON conditions - CTE (WITH ... AS) with multiple CTEs - Aggregate functions (count, sum, avg, min, max) - CASE/WHEN/THEN/ELSE/END expressions - BETWEEN, IN, LIKE/ILIKE, IS NULL/IS NOT NULL - Dotted path identifiers (table.column) - Subqueries in FROM clause - CREATE TYPE with colon syntax (name: type) - UPDATE SET ... WHERE, DELETE FROM ... WHERE Infrastructure: - Raft consensus: leader election, log replication, RequestVote/AppendEntries - Sharding: hash-based, range-based, consistent hashing, rebalancing - Fixed lexer: = is equality, := is assignment, added : (colon) token - 34 new parser tests (107 total, all passing)
This commit is contained in:
+274
-12
@@ -2,6 +2,7 @@
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import std/strutils
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import lexer
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import ast
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import ../core/types
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type
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Parser* = object
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@@ -56,9 +57,32 @@ proc parsePrimary(p: var Parser): Node =
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Node(kind: nkNullLit, line: tok.line, col: tok.col)
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of tkIdent:
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discard p.advance()
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Node(kind: nkIdent, identName: tok.value, line: tok.line, col: tok.col)
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# Check for function call: ident(...)
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if p.peek().kind == tkLParen:
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discard p.advance() # consume (
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var args: seq[Node] = @[]
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if p.peek().kind != tkRParen:
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args.add(p.parseExpr())
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while p.match(tkComma):
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args.add(p.parseExpr())
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discard p.expect(tkRParen)
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return Node(kind: nkFuncCall, funcName: tok.value, funcArgs: args,
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line: tok.line, col: tok.col)
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# Check for dotted path: ident.ident.ident
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var parts = @[tok.value]
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while p.peek().kind == tkDot:
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discard p.advance() # consume .
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parts.add(p.expect(tkIdent).value)
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if parts.len == 1:
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return Node(kind: nkIdent, identName: tok.value, line: tok.line, col: tok.col)
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return Node(kind: nkPath, pathParts: parts, line: tok.line, col: tok.col)
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of tkLParen:
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discard p.advance()
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# Check for subquery
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if p.peek().kind == tkSelect:
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let sub = p.parseSelect()
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discard p.expect(tkRParen)
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return Node(kind: nkSubquery, subQuery: sub, line: tok.line, col: tok.col)
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let expr = p.parseExpr()
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discard p.expect(tkRParen)
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expr
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@@ -87,14 +111,40 @@ proc parsePrimary(p: var Parser): Node =
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discard p.advance()
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let operand = p.parsePrimary()
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Node(kind: nkUnaryOp, unOp: ukNeg, unOperand: operand, line: tok.line, col: tok.col)
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of tkCount:
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of tkCount, tkSum, tkAvg, tkMin, tkMax:
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let funcName = tok.value
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discard p.advance()
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discard p.expect(tkLParen)
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var args: seq[Node] = @[]
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# Handle DISTINCT inside aggregate
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var hasDistinct = false
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if p.peek().kind == tkDistinct:
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discard p.advance()
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hasDistinct = true
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if p.peek().kind != tkRParen:
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args.add(p.parseExpr())
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discard p.expect(tkRParen)
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Node(kind: nkFuncCall, funcName: "count", funcArgs: args, line: tok.line, col: tok.col)
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var node = Node(kind: nkFuncCall, funcName: funcName.toLower(), funcArgs: args,
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line: tok.line, col: tok.col)
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return node
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of tkCase:
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discard p.advance()
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var caseExpr: Node = nil
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# CASE expr WHEN ... THEN ... ELSE ... END
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if p.peek().kind != tkWhen:
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caseExpr = p.parseExpr()
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var whens: seq[(Node, Node)] = @[]
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while p.match(tkWhen):
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let cond = p.parseExpr()
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discard p.expect(tkThen)
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let val = p.parseExpr()
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whens.add((cond, val))
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var elseExpr: Node = nil
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if p.match(tkElse):
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elseExpr = p.parseExpr()
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discard p.expect(tkEnd)
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Node(kind: nkCase, caseExpr: caseExpr, caseWhens: whens, caseElse: elseExpr,
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line: tok.line, col: tok.col)
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else:
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discard p.advance()
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Node(kind: nkNullLit, line: tok.line, col: tok.col)
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@@ -128,6 +178,37 @@ proc parseAddSub(p: var Parser): Node =
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proc parseComparison(p: var Parser): Node =
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result = p.parseAddSub()
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# Handle BETWEEN ... AND ...
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if p.peek().kind == tkBetween:
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let tok = p.advance()
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let low = p.parseAddSub()
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discard p.expect(tkAnd)
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let high = p.parseAddSub()
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return Node(kind: nkBetweenExpr, betweenExpr: result,
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betweenLow: low, betweenHigh: high, line: tok.line, col: tok.col)
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# Handle IN (subquery | list)
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if p.peek().kind == tkIn:
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let tok = p.advance()
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let right = p.parseAddSub()
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return Node(kind: nkInExpr, inLeft: result, inRight: right,
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line: tok.line, col: tok.col)
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# Handle LIKE / ILIKE
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if p.peek().kind in {tkLike, tkILike}:
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let isILike = p.peek().kind == tkILike
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let tok = p.advance()
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let pattern = p.parseAddSub()
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return Node(kind: nkLikeExpr, likeExpr: result, likePattern: pattern,
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likeCaseInsensitive: isILike, line: tok.line, col: tok.col)
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# Handle IS NULL / IS NOT NULL
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if p.peek().kind == tkIs:
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let tok = p.advance()
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var negated = false
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if p.peek().kind == tkNot:
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discard p.advance()
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negated = true
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discard p.advance() # consume NULL token (assumed)
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return Node(kind: nkIsExpr, isExpr: result, isNegated: negated,
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line: tok.line, col: tok.col)
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while p.peek().kind in {tkEq, tkNotEq, tkLt, tkLtEq, tkGt, tkGtEq}:
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let op = case p.peek().kind
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of tkEq: bkEq
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@@ -169,35 +250,156 @@ proc parseOr(p: var Parser): Node =
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proc parseExpr(p: var Parser): Node =
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return p.parseOr()
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proc parseJoinType(p: var Parser): JoinKind =
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if p.match(tkInner):
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return jkInner
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elif p.match(tkLeft):
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if p.match(tkOuter): discard
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return jkLeft
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elif p.match(tkRight):
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if p.match(tkOuter): discard
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return jkRight
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elif p.match(tkFull):
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if p.match(tkOuter): discard
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return jkFull
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elif p.match(tkCross):
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return jkCross
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return jkInner
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proc parseWith(p: var Parser): Node =
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# WITH name AS (select), name2 AS (select2) SELECT ...
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let tok = p.expect(tkWith)
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result = Node(kind: nkWith, line: tok.line, col: tok.col)
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result.withBindings = @[]
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# Parse first CTE
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let cteName = p.expect(tkIdent).value
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discard p.expect(tkAs)
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discard p.expect(tkLParen)
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let cteQuery = p.parseSelect()
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discard p.expect(tkRParen)
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result.withBindings.add((cteName, cteQuery))
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# Parse additional CTEs
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while p.match(tkComma):
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let name = p.expect(tkIdent).value
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discard p.expect(tkAs)
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discard p.expect(tkLParen)
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let query = p.parseSelect()
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discard p.expect(tkRParen)
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result.withBindings.add((name, query))
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proc parseSelect(p: var Parser): Node =
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# Handle WITH (CTE)
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var withClause: Node = nil
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if p.peek().kind == tkWith:
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withClause = p.parseWith()
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let tok = p.expect(tkSelect)
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result = Node(kind: nkSelect, line: tok.line, col: tok.col)
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if withClause != nil:
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result.selWith = withClause.withBindings
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if p.peek().kind == tkDistinct:
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discard p.advance()
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result.selDistinct = true
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# Parse SELECT list
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result.selResult = @[]
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result.selResult.add(p.parseExpr())
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while p.match(tkComma):
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result.selResult.add(p.parseExpr())
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# Parse FROM
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result.selJoins = @[]
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if p.match(tkFrom):
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let tableTok = p.expect(tkIdent)
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var alias = ""
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if p.match(tkAs):
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alias = p.expect(tkIdent).value
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elif p.peek().kind == tkIdent:
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alias = p.advance().value
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result.selFrom = Node(kind: nkFrom, fromTable: tableTok.value,
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fromAlias: alias, line: tableTok.line, col: tableTok.col)
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# Handle subquery: (SELECT ...) AS alias
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if p.peek().kind == tkLParen:
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discard p.advance() # consume (
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let subquery = p.parseSelect()
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discard p.expect(tkRParen)
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var alias = ""
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if p.match(tkAs):
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alias = p.expect(tkIdent).value
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elif p.peek().kind == tkIdent:
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alias = p.advance().value
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result.selFrom = Node(kind: nkFrom, fromTable: "(subquery)",
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fromAlias: alias, line: tok.line, col: tok.col)
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else:
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let tableTok = p.expect(tkIdent)
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var alias = ""
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if p.match(tkAs):
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alias = p.expect(tkIdent).value
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elif p.peek().kind == tkIdent:
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alias = p.advance().value
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result.selFrom = Node(kind: nkFrom, fromTable: tableTok.value,
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fromAlias: alias, line: tableTok.line, col: tableTok.col)
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# Parse JOINs
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while p.peek().kind == tkJoin or
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(p.peek().kind in {tkInner, tkLeft, tkRight, tkFull, tkCross} and
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p.pos + 1 < p.tokens.len and p.tokens[p.pos + 1].kind == tkJoin):
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let jk = p.parseJoinType()
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discard p.expect(tkJoin)
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let joinTable = p.expect(tkIdent)
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var joinAlias = ""
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if p.match(tkAs):
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joinAlias = p.expect(tkIdent).value
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elif p.peek().kind == tkIdent:
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joinAlias = p.advance().value
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var joinCond: Node = nil
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if p.match(tkOn):
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joinCond = p.parseExpr()
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let joinTarget = Node(kind: nkFrom, fromTable: joinTable.value,
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fromAlias: joinAlias, line: joinTable.line, col: joinTable.col)
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result.selJoins.add(Node(kind: nkJoin, joinKind: jk, joinTarget: joinTarget,
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joinOn: joinCond, joinAlias: joinAlias,
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line: joinTable.line, col: joinTable.col))
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# Parse WHERE
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if p.match(tkWhere):
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result.selWhere = Node(kind: nkWhere, whereExpr: p.parseExpr())
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# Parse GROUP BY
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if p.match(tkGroup):
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discard p.expect(tkBy)
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result.selGroupBy = @[]
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result.selGroupBy.add(p.parseExpr())
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while p.match(tkComma):
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result.selGroupBy.add(p.parseExpr())
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# Parse HAVING
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if p.match(tkHaving):
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result.selHaving = Node(kind: nkHaving, havingExpr: p.parseExpr())
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# Parse ORDER BY
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if p.match(tkOrder):
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discard p.expect(tkBy)
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result.selOrderBy = @[]
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var firstExpr = p.parseExpr()
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var firstDir = sdAsc
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if p.match(tkDesc):
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firstDir = sdDesc
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elif p.match(tkAsc):
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firstDir = sdAsc
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result.selOrderBy.add(Node(kind: nkOrderBy, orderByExpr: firstExpr,
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orderByDir: firstDir))
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while p.match(tkComma):
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let expr = p.parseExpr()
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var dir = sdAsc
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if p.match(tkDesc):
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dir = sdDesc
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elif p.match(tkAsc):
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dir = sdAsc
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result.selOrderBy.add(Node(kind: nkOrderBy, orderByExpr: expr,
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orderByDir: dir))
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# Parse LIMIT
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if p.match(tkLimit):
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result.selLimit = Node(kind: nkLimit, limitExpr: p.parseExpr())
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# Parse OFFSET
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if p.match(tkOffset):
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result.selOffset = Node(kind: nkOffset, offsetExpr: p.parseExpr())
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@@ -210,21 +412,81 @@ proc parseUpdate(p: var Parser): Node =
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let tok = p.expect(tkUpdate)
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let target = p.expect(tkIdent).value
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result = Node(kind: nkUpdate, updTarget: target, line: tok.line, col: tok.col)
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if p.match(tkSet):
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result.updSet = @[]
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let field = p.expect(tkIdent).value
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discard p.match(tkEq) # = or :=
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let val = p.parseExpr()
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result.updSet.add(Node(kind: nkBinOp, binOp: bkAssign,
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binLeft: Node(kind: nkIdent, identName: field),
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binRight: val))
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while p.match(tkComma):
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let f = p.expect(tkIdent).value
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discard p.match(tkEq)
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let v = p.parseExpr()
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result.updSet.add(Node(kind: nkBinOp, binOp: bkAssign,
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binLeft: Node(kind: nkIdent, identName: f),
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binRight: v))
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if p.match(tkWhere):
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result.updWhere = Node(kind: nkWhere, whereExpr: p.parseExpr())
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proc parseDelete(p: var Parser): Node =
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let tok = p.expect(tkDelete)
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discard p.match(tkFrom) # optional FROM keyword
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let target = p.expect(tkIdent).value
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result = Node(kind: nkDelete, delTarget: target, line: tok.line, col: tok.col)
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if p.match(tkWhere):
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result.delWhere = Node(kind: nkWhere, whereExpr: p.parseExpr())
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proc parseCreateType(p: var Parser): Node =
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let tok = p.expect(tkCreate)
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discard p.expect(tkType)
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let name = p.expect(tkIdent).value
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result = Node(kind: nkCreateType, ctName: name, line: tok.line, col: tok.col)
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# Parse bases (EXTENDING)
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result.ctBases = @[]
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if p.match(tkIdent): # "extending" keyword mapped to ident
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# Check if the ident is "extending"
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# For now, just accept bases in braces
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discard
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# Parse body
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if p.match(tkLBrace):
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result.ctProperties = @[]
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result.ctLinks = @[]
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while p.peek().kind != tkRbrace and p.peek().kind != tkEof:
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discard p.match(tkComma) # optional comma separator
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# Parse property or link
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var isRequired = false
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var isMulti = false
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if p.peek().kind == tkRequired:
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discard p.advance()
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isRequired = true
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if p.peek().kind == tkMulti:
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discard p.advance()
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isMulti = true
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let fieldTok = p.expect(tkIdent)
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# Check for link or property
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if p.peek().kind == tkArrow: # -> means link
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discard p.advance() # consume ->
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let target = p.expect(tkIdent).value
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result.ctLinks.add(Node(kind: nkLinkDef,
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ldName: fieldTok.value, ldTarget: target,
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ldRequired: isRequired,
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ldCardinality: if isMulti: Many else: One))
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else:
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var typeName = ""
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if p.match(tkColon):
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typeName = p.expect(tkIdent).value
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result.ctProperties.add(Node(kind: nkPropertyDef,
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pdName: fieldTok.value, pdType: typeName,
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pdRequired: isRequired))
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discard p.match(tkSemicolon)
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discard p.expect(tkRbrace)
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proc parseStatement*(p: var Parser): Node =
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case p.peek().kind
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of tkSelect: p.parseSelect()
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of tkWith, tkSelect: p.parseSelect()
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of tkInsert: p.parseInsert()
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of tkUpdate: p.parseUpdate()
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of tkDelete: p.parseDelete()
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