diff options
Diffstat (limited to 'lib/pure/parsesql.nim')
| -rw-r--r-- | lib/pure/parsesql.nim | 50 |
1 files changed, 26 insertions, 24 deletions
diff --git a/lib/pure/parsesql.nim b/lib/pure/parsesql.nim index 042d5374f..b84c1a744 100644 --- a/lib/pure/parsesql.nim +++ b/lib/pure/parsesql.nim @@ -18,12 +18,12 @@ import # ------------------- scanner ------------------------------------------------- type - TokKind = enum ## enumeration of all SQL tokens - tkInvalid, ## invalid token - tkEof, ## end of file reached - tkIdentifier, ## abc - tkQuotedIdentifier, ## "abc" - tkStringConstant, ## 'abc' + TokKind = enum ## enumeration of all SQL tokens + tkInvalid, ## invalid token + tkEof, ## end of file reached + tkIdentifier, ## abc + tkQuotedIdentifier, ## "abc" + tkStringConstant, ## 'abc' tkEscapeConstant, ## e'abc' tkDollarQuotedConstant, ## $tag$abc$tag$ tkBitStringConstant, ## B'00011' @@ -40,9 +40,9 @@ type tkBracketRi, ## ']' tkDot ## '.' - Token = object # a token - kind: TokKind # the type of the token - literal: string # the parsed (string) literal + Token = object # a token + kind: TokKind # the type of the token + literal: string # the parsed (string) literal SqlLexer* = object of BaseLexer ## the parser object. filename: string @@ -162,7 +162,7 @@ proc skip(c: var SqlLexer) = break of '/': if c.buf[pos+1] == '*': - inc(pos,2) + inc(pos, 2) while true: case c.buf[pos] of '\0': break @@ -186,7 +186,7 @@ proc skip(c: var SqlLexer) = of '\c', '\L': pos = handleCRLF(c, pos) else: - break # EndOfFile also leaves the loop + break # EndOfFile also leaves the loop c.bufpos = pos proc getString(c: var SqlLexer, tok: var Token, kind: TokKind) = @@ -264,12 +264,13 @@ proc getSymbol(c: var SqlLexer, tok: var Token) = while true: add(tok.literal, c.buf[pos]) inc(pos) - if c.buf[pos] notin {'a'..'z','A'..'Z','0'..'9','_','$', '\128'..'\255'}: + if c.buf[pos] notin {'a'..'z', 'A'..'Z', '0'..'9', '_', '$', + '\128'..'\255'}: break c.bufpos = pos tok.kind = tkIdentifier -proc getQuotedIdentifier(c: var SqlLexer, tok: var Token, quote='\"') = +proc getQuotedIdentifier(c: var SqlLexer, tok: var Token, quote = '\"') = var pos = c.bufpos + 1 tok.kind = tkQuotedIdentifier while true: @@ -403,7 +404,7 @@ proc getTok(c: var SqlLexer, tok: var Token) = of 'x', 'X': if c.buf[c.bufpos + 1] == '\'': tok.kind = tkHexStringConstant - getBitHexString(c, tok, {'a'..'f','A'..'F','0'..'9'}) + getBitHexString(c, tok, {'a'..'f', 'A'..'F', '0'..'9'}) else: getSymbol(c, tok) of '$': getDollarString(c, tok) @@ -504,7 +505,7 @@ type nkConstraint, nkUnique, nkIdentity, - nkColumnDef, ## name, datatype, constraints + nkColumnDef, ## name, datatype, constraints nkInsert, nkUpdate, nkDelete, @@ -543,14 +544,14 @@ const type SqlParseError* = object of ValueError ## Invalid SQL encountered - SqlNode* = ref SqlNodeObj ## an SQL abstract syntax tree node - SqlNodeObj* = object ## an SQL abstract syntax tree node - case kind*: SqlNodeKind ## kind of syntax tree + SqlNode* = ref SqlNodeObj ## an SQL abstract syntax tree node + SqlNodeObj* = object ## an SQL abstract syntax tree node + case kind*: SqlNodeKind ## kind of syntax tree of LiteralNodes: - strVal*: string ## AST leaf: the identifier, numeric literal - ## string literal, etc. + strVal*: string ## AST leaf: the identifier, numeric literal + ## string literal, etc. else: - sons*: seq[SqlNode] ## the node's children + sons*: seq[SqlNode] ## the node's children SqlParser* = object of SqlLexer ## SQL parser object tok: Token @@ -714,7 +715,8 @@ proc identOrLiteral(p: var SqlParser): SqlNode = getTok(p) # we must consume a token here to prevent endless loops! proc primary(p: var SqlParser): SqlNode = - if (p.tok.kind == tkOperator and (p.tok.literal == "+" or p.tok.literal == "-")) or isKeyw(p, "not"): + if (p.tok.kind == tkOperator and (p.tok.literal == "+" or p.tok.literal == + "-")) or isKeyw(p, "not"): result = newNode(nkPrefix) result.add(newNode(nkIdent, p.tok.literal)) getTok(p) @@ -1439,7 +1441,7 @@ proc ra(n: SqlNode, s: var SqlWriter) = s.addKeyw("enum") rs(n, s) -proc renderSQL*(n: SqlNode, upperCase=false): string = +proc renderSQL*(n: SqlNode, upperCase = false): string = ## Converts an SQL abstract syntax tree to its string representation. var s: SqlWriter s.buffer = "" @@ -1493,7 +1495,7 @@ when not defined(js): finally: close(p) - proc parseSQL*(input: string, filename=""): SqlNode = + proc parseSQL*(input: string, filename = ""): SqlNode = ## parses the SQL from `input` into an AST and returns the AST. ## `filename` is only used for error messages. ## Syntax errors raise an `SqlParseError` exception. |