mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-21 15:12:02 +00:00
374 lines
14 KiB
C++
374 lines
14 KiB
C++
#include <Common/typeid_cast.h>
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#include <Parsers/ASTLiteral.h>
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#include <Parsers/ASTFunction.h>
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#include <Parsers/ASTWithAlias.h>
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#include <Parsers/ASTSubquery.h>
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#include <IO/WriteHelpers.h>
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#include <IO/WriteBufferFromString.h>
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namespace DB
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{
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void ASTFunction::appendColumnNameImpl(WriteBuffer & ostr) const
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{
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writeString(name, ostr);
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if (parameters)
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{
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writeChar('(', ostr);
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for (auto it = parameters->children.begin(); it != parameters->children.end(); ++it)
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{
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if (it != parameters->children.begin())
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writeCString(", ", ostr);
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(*it)->appendColumnName(ostr);
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}
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writeChar(')', ostr);
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}
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writeChar('(', ostr);
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for (auto it = arguments->children.begin(); it != arguments->children.end(); ++it)
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{
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if (it != arguments->children.begin())
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writeCString(", ", ostr);
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(*it)->appendColumnName(ostr);
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}
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writeChar(')', ostr);
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}
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/** Get the text that identifies this element. */
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String ASTFunction::getID(char delim) const
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{
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return "Function" + (delim + name);
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}
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ASTPtr ASTFunction::clone() const
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{
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auto res = std::make_shared<ASTFunction>(*this);
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res->children.clear();
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if (arguments) { res->arguments = arguments->clone(); res->children.push_back(res->arguments); }
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if (parameters) { res->parameters = parameters->clone(); res->children.push_back(res->parameters); }
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return res;
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}
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/** A special hack. If it's LIKE or NOT LIKE expression and the right hand side is a string literal,
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* we will highlight unescaped metacharacters % and _ in string literal for convenience.
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* Motivation: most people are unaware that _ is a metacharacter and forgot to properly escape it with two backslashes.
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* With highlighting we make it clearly obvious.
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*
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* Another case is regexp match. Suppose the user types match(URL, 'www.yandex.ru'). It often means that the user is unaware that . is a metacharacter.
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*/
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static bool highlightStringLiteralWithMetacharacters(const ASTPtr & node, const IAST::FormatSettings & settings, const char * metacharacters)
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{
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if (const auto * literal = node->as<ASTLiteral>())
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{
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if (literal->value.getType() == Field::Types::String)
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{
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auto string = applyVisitor(FieldVisitorToString(), literal->value);
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unsigned escaping = 0;
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for (auto c : string)
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{
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if (c == '\\')
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{
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settings.ostr << c;
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if (escaping == 2)
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escaping = 0;
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++escaping;
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}
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else if (nullptr != strchr(metacharacters, c))
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{
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if (escaping == 2) /// Properly escaped metacharacter
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settings.ostr << c;
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else /// Unescaped metacharacter
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settings.ostr << "\033[1;35m" << c << "\033[0m";
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escaping = 0;
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}
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else
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{
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settings.ostr << c;
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escaping = 0;
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}
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}
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return true;
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}
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}
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return false;
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}
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void ASTFunction::formatImplWithoutAlias(const FormatSettings & settings, FormatState & state, FormatStateStacked frame) const
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{
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FormatStateStacked nested_need_parens = frame;
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FormatStateStacked nested_dont_need_parens = frame;
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nested_need_parens.need_parens = true;
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nested_dont_need_parens.need_parens = false;
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/// Should this function to be written as operator?
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bool written = false;
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if (arguments && !parameters)
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{
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if (arguments->children.size() == 1)
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{
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const char * operators[] =
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{
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"negate", "-",
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"not", "NOT ",
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nullptr
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};
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for (const char ** func = operators; *func; func += 2)
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{
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if (0 == strcmp(name.c_str(), func[0]))
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{
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if (frame.need_parens)
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settings.ostr << '(';
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settings.ostr << (settings.hilite ? hilite_operator : "") << func[1] << (settings.hilite ? hilite_none : "");
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/** A particularly stupid case. If we have a unary minus before a literal that is a negative number
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* "-(-1)" or "- -1", this can not be formatted as `--1`, since this will be interpreted as a comment.
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* Instead, add a space.
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* PS. You can not just ask to add parentheses - see formatImpl for ASTLiteral.
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*/
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if (name == "negate" && arguments->children[0]->as<ASTLiteral>())
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settings.ostr << ' ';
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arguments->formatImpl(settings, state, nested_need_parens);
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written = true;
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if (frame.need_parens)
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settings.ostr << ')';
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}
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}
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}
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/** need_parens - do we need parentheses around the expression with the operator.
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* They are needed only if this expression is included in another expression with the operator.
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*/
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if (!written && arguments->children.size() == 2)
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{
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const char * operators[] =
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{
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"multiply", " * ",
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"divide", " / ",
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"modulo", " % ",
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"plus", " + ",
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"minus", " - ",
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"notEquals", " != ",
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"lessOrEquals", " <= ",
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"greaterOrEquals", " >= ",
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"less", " < ",
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"greater", " > ",
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"equals", " = ",
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"like", " LIKE ",
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"notLike", " NOT LIKE ",
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"in", " IN ",
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"notIn", " NOT IN ",
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"globalIn", " GLOBAL IN ",
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"globalNotIn", " GLOBAL NOT IN ",
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nullptr
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};
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for (const char ** func = operators; *func; func += 2)
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{
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if (0 == strcmp(name.c_str(), func[0]))
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{
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if (frame.need_parens)
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settings.ostr << '(';
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arguments->children[0]->formatImpl(settings, state, nested_need_parens);
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settings.ostr << (settings.hilite ? hilite_operator : "") << func[1] << (settings.hilite ? hilite_none : "");
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bool special_hilite = settings.hilite
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&& (name == "like" || name == "notLike")
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&& highlightStringLiteralWithMetacharacters(arguments->children[1], settings, "%_");
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/// Format x IN 1 as x IN (1): put parens around rhs even if there is a single element in set.
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const auto * second_arg_func = arguments->children[1]->as<ASTFunction>();
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const auto * second_arg_literal = arguments->children[1]->as<ASTLiteral>();
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bool extra_parents_around_in_rhs = (name == "in" || name == "notIn" || name == "globalIn" || name == "globalNotIn")
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&& !second_arg_func
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&& !(second_arg_literal
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&& (second_arg_literal->value.getType() == Field::Types::Tuple
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|| second_arg_literal->value.getType() == Field::Types::Array))
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&& !arguments->children[1]->as<ASTSubquery>();
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if (extra_parents_around_in_rhs)
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{
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settings.ostr << '(';
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arguments->children[1]->formatImpl(settings, state, nested_dont_need_parens);
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settings.ostr << ')';
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}
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if (!special_hilite && !extra_parents_around_in_rhs)
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arguments->children[1]->formatImpl(settings, state, nested_need_parens);
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if (frame.need_parens)
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settings.ostr << ')';
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written = true;
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}
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}
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if (!written && 0 == strcmp(name.c_str(), "arrayElement"))
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{
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if (frame.need_parens)
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settings.ostr << '(';
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arguments->children[0]->formatImpl(settings, state, nested_need_parens);
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settings.ostr << (settings.hilite ? hilite_operator : "") << '[' << (settings.hilite ? hilite_none : "");
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arguments->children[1]->formatImpl(settings, state, nested_dont_need_parens);
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settings.ostr << (settings.hilite ? hilite_operator : "") << ']' << (settings.hilite ? hilite_none : "");
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written = true;
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if (frame.need_parens)
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settings.ostr << ')';
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}
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if (!written && 0 == strcmp(name.c_str(), "tupleElement"))
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{
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/// It can be printed in a form of 'x.1' only if right hand side is unsigned integer literal.
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if (const auto * lit = arguments->children[1]->as<ASTLiteral>())
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{
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if (lit->value.getType() == Field::Types::UInt64)
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{
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if (frame.need_parens)
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settings.ostr << '(';
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arguments->children[0]->formatImpl(settings, state, nested_need_parens);
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settings.ostr << (settings.hilite ? hilite_operator : "") << "." << (settings.hilite ? hilite_none : "");
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arguments->children[1]->formatImpl(settings, state, nested_dont_need_parens);
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written = true;
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if (frame.need_parens)
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settings.ostr << ')';
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}
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}
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}
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if (!written && 0 == strcmp(name.c_str(), "lambda"))
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{
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/// Special case: one-element tuple in lhs of lambda is printed as its element.
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if (frame.need_parens)
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settings.ostr << '(';
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const auto * first_arg_func = arguments->children[0]->as<ASTFunction>();
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if (first_arg_func
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&& first_arg_func->name == "tuple"
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&& first_arg_func->arguments
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&& first_arg_func->arguments->children.size() == 1)
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{
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first_arg_func->arguments->children[0]->formatImpl(settings, state, nested_need_parens);
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}
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else
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arguments->children[0]->formatImpl(settings, state, nested_need_parens);
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settings.ostr << (settings.hilite ? hilite_operator : "") << " -> " << (settings.hilite ? hilite_none : "");
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arguments->children[1]->formatImpl(settings, state, nested_need_parens);
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if (frame.need_parens)
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settings.ostr << ')';
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written = true;
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}
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}
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if (!written && arguments->children.size() >= 2)
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{
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const char * operators[] =
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{
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"and", " AND ",
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"or", " OR ",
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nullptr
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};
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for (const char ** func = operators; *func; func += 2)
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{
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if (0 == strcmp(name.c_str(), func[0]))
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{
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if (frame.need_parens)
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settings.ostr << '(';
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for (size_t i = 0; i < arguments->children.size(); ++i)
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{
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if (i != 0)
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settings.ostr << (settings.hilite ? hilite_operator : "") << func[1] << (settings.hilite ? hilite_none : "");
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arguments->children[i]->formatImpl(settings, state, nested_need_parens);
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}
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if (frame.need_parens)
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settings.ostr << ')';
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written = true;
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}
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}
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}
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if (!written && 0 == strcmp(name.c_str(), "array"))
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{
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settings.ostr << (settings.hilite ? hilite_operator : "") << '[' << (settings.hilite ? hilite_none : "");
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for (size_t i = 0; i < arguments->children.size(); ++i)
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{
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if (i != 0)
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settings.ostr << ", ";
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arguments->children[i]->formatImpl(settings, state, nested_dont_need_parens);
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}
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settings.ostr << (settings.hilite ? hilite_operator : "") << ']' << (settings.hilite ? hilite_none : "");
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written = true;
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}
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if (!written && arguments->children.size() >= 2 && 0 == strcmp(name.c_str(), "tuple"))
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{
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settings.ostr << (settings.hilite ? hilite_operator : "") << '(' << (settings.hilite ? hilite_none : "");
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for (size_t i = 0; i < arguments->children.size(); ++i)
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{
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if (i != 0)
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settings.ostr << ", ";
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arguments->children[i]->formatImpl(settings, state, nested_dont_need_parens);
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}
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settings.ostr << (settings.hilite ? hilite_operator : "") << ')' << (settings.hilite ? hilite_none : "");
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written = true;
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}
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}
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if (!written)
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{
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settings.ostr << (settings.hilite ? hilite_function : "") << name;
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if (parameters)
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{
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settings.ostr << '(' << (settings.hilite ? hilite_none : "");
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parameters->formatImpl(settings, state, nested_dont_need_parens);
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settings.ostr << (settings.hilite ? hilite_function : "") << ')';
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}
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if (arguments)
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{
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settings.ostr << '(' << (settings.hilite ? hilite_none : "");
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bool special_hilite_regexp = settings.hilite
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&& (name == "match" || name == "extract" || name == "extractAll" || name == "replaceRegexpOne" || name == "replaceRegexpAll");
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for (size_t i = 0, size = arguments->children.size(); i < size; ++i)
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{
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if (i != 0)
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settings.ostr << ", ";
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bool special_hilite = false;
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if (i == 1 && special_hilite_regexp)
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special_hilite = highlightStringLiteralWithMetacharacters(arguments->children[i], settings, "|()^$.[]?*+{:-");
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if (!special_hilite)
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arguments->children[i]->formatImpl(settings, state, nested_dont_need_parens);
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}
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settings.ostr << (settings.hilite ? hilite_function : "") << ')';
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}
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settings.ostr << (settings.hilite ? hilite_none : "");
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}
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}
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}
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