Step 413: add T-SQL parser and generator support
This commit is contained in:
Bill
@@ -14,6 +14,7 @@
|
||||
#include "FSharpGenerator.h"
|
||||
#include "VBNetGenerator.h"
|
||||
#include "PostgreSQLGenerator.h"
|
||||
#include "TSQLGenerator.h"
|
||||
#include "CGenerator.h"
|
||||
#include "WatGenerator.h"
|
||||
#include "CommonLispGenerator.h"
|
||||
|
||||
@@ -167,6 +167,7 @@ private:
|
||||
#include "ast/FSharpParser.h"
|
||||
#include "ast/VBNetParser.h"
|
||||
#include "ast/PostgreSQLParser.h"
|
||||
#include "ast/TSQLParser.h"
|
||||
#include "ast/CParser.h"
|
||||
#include "ast/WatParser.h"
|
||||
#include "ast/CommonLispParser.h"
|
||||
|
||||
161
editor/src/ast/TSQLGenerator.h
Normal file
161
editor/src/ast/TSQLGenerator.h
Normal file
@@ -0,0 +1,161 @@
|
||||
#pragma once
|
||||
|
||||
#include "PostgreSQLGenerator.h"
|
||||
#include "SqlNodes.h"
|
||||
|
||||
#include <sstream>
|
||||
#include <string>
|
||||
|
||||
class TSQLGenerator : public PostgreSQLGenerator {
|
||||
public:
|
||||
std::string commentPrefix() const { return "-- "; }
|
||||
|
||||
std::string generate(const ASTNode* node) override {
|
||||
return dispatchGenerate(this, node, "-- Unknown concept: ");
|
||||
}
|
||||
|
||||
std::string visitModule(const Module* module) override {
|
||||
std::ostringstream oss;
|
||||
oss << "-- Module: " << module->name << "\n\n";
|
||||
for (const auto* v : module->getChildren("variables")) {
|
||||
oss << generate(v) << "\n";
|
||||
}
|
||||
for (const auto* stmt : module->getChildren("statements")) {
|
||||
oss << generate(stmt) << "\n";
|
||||
}
|
||||
for (const auto* fn : module->getChildren("functions")) {
|
||||
oss << generate(fn) << "\n";
|
||||
}
|
||||
std::string out = oss.str();
|
||||
while (!out.empty() && (out.back() == '\n' || out.back() == '\r')) out.pop_back();
|
||||
return out;
|
||||
}
|
||||
|
||||
std::string visitFunction(const Function* function) override {
|
||||
std::ostringstream oss;
|
||||
for (const auto* anno : function->getChildren("annotations")) {
|
||||
oss << generate(anno) << "\n";
|
||||
}
|
||||
oss << "CREATE PROCEDURE " << function->name << "\nAS\nBEGIN\n";
|
||||
for (const auto* stmt : function->getChildren("body")) {
|
||||
oss << " " << generate(stmt) << "\n";
|
||||
}
|
||||
oss << "END;";
|
||||
return oss.str();
|
||||
}
|
||||
|
||||
std::string visitVariable(const Variable* variable) override {
|
||||
std::ostringstream oss;
|
||||
oss << "DECLARE " << variable->name;
|
||||
auto* type = variable->getChild("type");
|
||||
if (type) oss << " " << generate(type);
|
||||
auto* init = variable->getChild("initializer");
|
||||
if (init) oss << " = " << generate(init);
|
||||
oss << ";";
|
||||
return oss.str();
|
||||
}
|
||||
|
||||
std::string visitAssignment(const Assignment* assignment) override {
|
||||
auto* t = assignment->getChild("target");
|
||||
auto* v = assignment->getChild("value");
|
||||
return "SET " + std::string(t ? generate(t) : "@value") +
|
||||
" = " + std::string(v ? generate(v) : "NULL") + ";";
|
||||
}
|
||||
|
||||
std::string visitExpressionStatement(const ExpressionStatement* stmt) override {
|
||||
auto* expr = stmt->getChild("expression");
|
||||
return expr ? generate(expr) : "";
|
||||
}
|
||||
|
||||
std::string visitFunctionCall(const FunctionCall* call) override {
|
||||
std::ostringstream oss;
|
||||
if (call->functionName == "PRINT") {
|
||||
oss << "PRINT ";
|
||||
auto args = call->getChildren("arguments");
|
||||
if (!args.empty()) oss << generate(args.front());
|
||||
oss << ";";
|
||||
return oss.str();
|
||||
}
|
||||
|
||||
oss << call->functionName << "(";
|
||||
auto args = call->getChildren("arguments");
|
||||
for (size_t i = 0; i < args.size(); ++i) {
|
||||
if (i > 0) oss << ", ";
|
||||
oss << generate(args[i]);
|
||||
}
|
||||
oss << ")";
|
||||
return oss.str();
|
||||
}
|
||||
|
||||
std::string visitPrimitiveType(const PrimitiveType* type) override {
|
||||
if (type->kind == "int" || type->kind == "INTEGER") return "INT";
|
||||
if (type->kind == "float" || type->kind == "double") return "FLOAT";
|
||||
if (type->kind == "string" || type->kind == "TEXT") return "NVARCHAR(MAX)";
|
||||
if (type->kind == "bool") return "BIT";
|
||||
if (type->kind == "void") return "VOID";
|
||||
return type->kind;
|
||||
}
|
||||
|
||||
std::string visitTableDeclaration(const ASTNode* node) override {
|
||||
auto* table = static_cast<const TableDeclaration*>(node);
|
||||
std::ostringstream oss;
|
||||
oss << "CREATE TABLE " << table->name << " (";
|
||||
|
||||
auto cols = table->getChildren("columns");
|
||||
if (cols.empty()) {
|
||||
oss << "\n id INT IDENTITY(1,1) PRIMARY KEY";
|
||||
} else {
|
||||
for (size_t i = 0; i < cols.size(); ++i) {
|
||||
oss << "\n " << generate(cols[i]);
|
||||
if (i + 1 < cols.size()) oss << ",";
|
||||
}
|
||||
}
|
||||
oss << "\n);";
|
||||
return oss.str();
|
||||
}
|
||||
|
||||
std::string visitSelectQuery(const ASTNode* node) override {
|
||||
auto* q = static_cast<const SelectQuery*>(node);
|
||||
std::ostringstream oss;
|
||||
oss << "SELECT ";
|
||||
auto* topNode = q->getChild("top");
|
||||
if (topNode) {
|
||||
auto* top = static_cast<const IntegerLiteral*>(topNode);
|
||||
oss << "TOP " << top->value << " ";
|
||||
}
|
||||
if (q->distinct) oss << "DISTINCT ";
|
||||
|
||||
auto cols = q->getChildren("columns");
|
||||
if (cols.empty()) {
|
||||
oss << "*";
|
||||
} else {
|
||||
for (size_t i = 0; i < cols.size(); ++i) {
|
||||
if (i > 0) oss << ", ";
|
||||
oss << generate(cols[i]);
|
||||
}
|
||||
}
|
||||
|
||||
auto* from = q->getChild("from");
|
||||
if (from && from->conceptType == "TableDeclaration") {
|
||||
oss << " FROM " << static_cast<const TableDeclaration*>(from)->name;
|
||||
} else if (from) {
|
||||
oss << " FROM " << generate(from);
|
||||
}
|
||||
for (const auto* join : q->getChildren("joins")) {
|
||||
oss << " " << generate(join);
|
||||
}
|
||||
auto* where = q->getChild("where");
|
||||
if (where) oss << " " << generate(where);
|
||||
oss << ";";
|
||||
return oss.str();
|
||||
}
|
||||
|
||||
std::string visitColumnDefinition(const ASTNode* node) override {
|
||||
auto* col = static_cast<const ColumnDefinition*>(node);
|
||||
std::ostringstream oss;
|
||||
oss << col->name << " " << (col->dataType.empty() ? "NVARCHAR(MAX)" : col->dataType);
|
||||
if (!col->nullable) oss << " NOT NULL";
|
||||
if (!col->defaultValue.empty()) oss << " DEFAULT " << col->defaultValue;
|
||||
return oss.str();
|
||||
}
|
||||
};
|
||||
377
editor/src/ast/TSQLParser.h
Normal file
377
editor/src/ast/TSQLParser.h
Normal file
@@ -0,0 +1,377 @@
|
||||
#pragma once
|
||||
|
||||
#include "ASTNode.h"
|
||||
#include "Module.h"
|
||||
#include "Function.h"
|
||||
#include "Variable.h"
|
||||
#include "Statement.h"
|
||||
#include "Expression.h"
|
||||
#include "Type.h"
|
||||
#include "SqlNodes.h"
|
||||
#include "../ast/Parser.h"
|
||||
|
||||
#include <algorithm>
|
||||
#include <sstream>
|
||||
#include <string>
|
||||
#include <vector>
|
||||
|
||||
class TSQLParser {
|
||||
public:
|
||||
static std::unique_ptr<Module> parseTSQL(const std::string& source) {
|
||||
auto module = std::make_unique<Module>();
|
||||
module->id = IdGenerator::next("mod");
|
||||
module->name = "parsed_tsql_module";
|
||||
module->targetLanguage = "tsql";
|
||||
parseStatements(source, module.get());
|
||||
return module;
|
||||
}
|
||||
|
||||
static ParseResult parseTSQLWithDiagnostics(const std::string& source) {
|
||||
ParseResult result;
|
||||
result.module = parseTSQL(source);
|
||||
return result;
|
||||
}
|
||||
|
||||
private:
|
||||
static void parseStatements(const std::string& source, Module* module) {
|
||||
for (const auto& stmtRaw : splitStatements(source)) {
|
||||
std::string stmt = trim(stmtRaw);
|
||||
if (stmt.empty()) continue;
|
||||
std::string lower = toLower(stmt);
|
||||
|
||||
if (startsWith(lower, "create table ")) {
|
||||
parseCreateTable(stmt, module);
|
||||
continue;
|
||||
}
|
||||
if (startsWith(lower, "create index ") || startsWith(lower, "create unique index ")) {
|
||||
parseCreateIndex(stmt, module);
|
||||
continue;
|
||||
}
|
||||
if (startsWith(lower, "select ")) {
|
||||
parseSelect(stmt, module);
|
||||
continue;
|
||||
}
|
||||
if (startsWith(lower, "insert into ")) {
|
||||
parseInsert(stmt, module);
|
||||
continue;
|
||||
}
|
||||
if (startsWith(lower, "update ")) {
|
||||
parseUpdate(stmt, module);
|
||||
continue;
|
||||
}
|
||||
if (startsWith(lower, "delete from ")) {
|
||||
parseDelete(stmt, module);
|
||||
continue;
|
||||
}
|
||||
if (startsWith(lower, "create procedure ")) {
|
||||
parseProcedure(stmt, module);
|
||||
continue;
|
||||
}
|
||||
if (startsWith(lower, "declare ")) {
|
||||
parseDeclare(stmt, module);
|
||||
continue;
|
||||
}
|
||||
if (startsWith(lower, "set ")) {
|
||||
parseSet(stmt, module);
|
||||
continue;
|
||||
}
|
||||
if (startsWith(lower, "print ")) {
|
||||
parsePrint(stmt, module);
|
||||
continue;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
static void parseCreateTable(const std::string& stmt, Module* module) {
|
||||
std::string tableName = extractAfterKeyword(stmt, "TABLE ");
|
||||
tableName = trim(untilDelimiter(tableName, "("));
|
||||
|
||||
auto* table = new TableDeclaration();
|
||||
table->id = IdGenerator::next("table");
|
||||
table->name = tableName;
|
||||
auto dotPos = tableName.find('.');
|
||||
if (dotPos != std::string::npos) table->schema = tableName.substr(0, dotPos);
|
||||
|
||||
auto lp = stmt.find('(');
|
||||
auto rp = stmt.rfind(')');
|
||||
if (lp != std::string::npos && rp != std::string::npos && rp > lp) {
|
||||
std::string cols = stmt.substr(lp + 1, rp - lp - 1);
|
||||
std::stringstream ss(cols);
|
||||
std::string item;
|
||||
while (std::getline(ss, item, ',')) {
|
||||
std::string colLine = trim(item);
|
||||
if (colLine.empty()) continue;
|
||||
std::string lowerCol = toLower(colLine);
|
||||
if (startsWith(lowerCol, "constraint ") ||
|
||||
startsWith(lowerCol, "primary key") ||
|
||||
startsWith(lowerCol, "foreign key")) continue;
|
||||
|
||||
std::vector<std::string> parts = splitWhitespace(colLine);
|
||||
if (parts.size() < 2) continue;
|
||||
auto* col = new ColumnDefinition();
|
||||
col->id = IdGenerator::next("col");
|
||||
col->name = parts[0];
|
||||
col->dataType = parts[1];
|
||||
if (parts.size() >= 3 &&
|
||||
(toLower(parts[2]).find("identity") != std::string::npos ||
|
||||
toLower(parts[2]).find("(") != std::string::npos)) {
|
||||
col->dataType += " " + parts[2];
|
||||
}
|
||||
col->nullable = (lowerCol.find("not null") == std::string::npos);
|
||||
table->addChild("columns", col);
|
||||
}
|
||||
}
|
||||
|
||||
module->addChild("statements", table);
|
||||
}
|
||||
|
||||
static void parseCreateIndex(const std::string& stmt, Module* module) {
|
||||
std::string lower = toLower(stmt);
|
||||
bool unique = startsWith(lower, "create unique index ");
|
||||
|
||||
std::string idxName = extractAfterKeyword(stmt, "INDEX ");
|
||||
std::string tableName = extractAfterKeyword(stmt, "ON ");
|
||||
auto* idx = new IndexDefinition();
|
||||
idx->id = IdGenerator::next("idx");
|
||||
idx->name = trim(untilDelimiter(idxName, " ON"));
|
||||
idx->tableName = trim(untilDelimiter(tableName, "("));
|
||||
idx->unique = unique;
|
||||
module->addChild("statements", idx);
|
||||
}
|
||||
|
||||
static void parseSelect(const std::string& stmt, Module* module) {
|
||||
std::string lower = toLower(stmt);
|
||||
auto* q = new SelectQuery();
|
||||
q->id = IdGenerator::next("sel");
|
||||
q->distinct = (lower.find("select distinct") == 0);
|
||||
|
||||
auto topPos = lower.find("select top ");
|
||||
if (topPos == 0) {
|
||||
std::string afterTop = trim(stmt.substr(11));
|
||||
std::string topCount = firstToken(afterTop);
|
||||
if (!topCount.empty() && std::all_of(topCount.begin(), topCount.end(), ::isdigit)) {
|
||||
q->setChild("top", new IntegerLiteral(IdGenerator::next("lit"), std::stoi(topCount)));
|
||||
}
|
||||
}
|
||||
|
||||
auto fromPos = lower.find(" from ");
|
||||
if (fromPos != std::string::npos) {
|
||||
std::string afterFrom = trim(stmt.substr(fromPos + 6));
|
||||
std::string fromName = firstToken(afterFrom);
|
||||
auto* from = new TableDeclaration();
|
||||
from->id = IdGenerator::next("tbl");
|
||||
from->name = fromName;
|
||||
q->setChild("from", from);
|
||||
}
|
||||
|
||||
size_t search = 0;
|
||||
while (true) {
|
||||
auto joinPos = lower.find(" join ", search);
|
||||
if (joinPos == std::string::npos) break;
|
||||
auto tableStart = joinPos + 6;
|
||||
std::string joinRest = stmt.substr(tableStart);
|
||||
std::string tableName = firstToken(joinRest);
|
||||
auto* j = new JoinClause();
|
||||
j->id = IdGenerator::next("join");
|
||||
j->joinType = detectJoinType(lower, joinPos);
|
||||
j->tableName = tableName;
|
||||
q->addChild("joins", j);
|
||||
search = tableStart + 1;
|
||||
}
|
||||
|
||||
auto wherePos = lower.find(" where ");
|
||||
if (wherePos != std::string::npos) {
|
||||
auto* w = new WhereClause();
|
||||
w->id = IdGenerator::next("where");
|
||||
w->expression = trim(stmt.substr(wherePos + 7));
|
||||
q->setChild("where", w);
|
||||
}
|
||||
|
||||
module->addChild("statements", q);
|
||||
}
|
||||
|
||||
static void parseInsert(const std::string& stmt, Module* module) {
|
||||
auto* ins = new InsertStatement();
|
||||
ins->id = IdGenerator::next("ins");
|
||||
ins->tableName = extractAfterKeyword(stmt, "INTO ");
|
||||
ins->tableName = trim(untilDelimiter(ins->tableName, "("));
|
||||
module->addChild("statements", ins);
|
||||
}
|
||||
|
||||
static void parseUpdate(const std::string& stmt, Module* module) {
|
||||
auto* up = new UpdateStatement();
|
||||
up->id = IdGenerator::next("upd");
|
||||
up->tableName = trim(untilDelimiter(extractAfterKeyword(stmt, "UPDATE "), " SET"));
|
||||
|
||||
std::string lower = toLower(stmt);
|
||||
auto wherePos = lower.find(" where ");
|
||||
if (wherePos != std::string::npos) {
|
||||
auto* w = new WhereClause();
|
||||
w->id = IdGenerator::next("where");
|
||||
w->expression = trim(stmt.substr(wherePos + 7));
|
||||
up->setChild("where", w);
|
||||
}
|
||||
module->addChild("statements", up);
|
||||
}
|
||||
|
||||
static void parseDelete(const std::string& stmt, Module* module) {
|
||||
auto* del = new DeleteStatement();
|
||||
del->id = IdGenerator::next("del");
|
||||
del->tableName = trim(untilDelimiter(extractAfterKeyword(stmt, "FROM "), " WHERE"));
|
||||
std::string lower = toLower(stmt);
|
||||
auto wherePos = lower.find(" where ");
|
||||
if (wherePos != std::string::npos) {
|
||||
auto* w = new WhereClause();
|
||||
w->id = IdGenerator::next("where");
|
||||
w->expression = trim(stmt.substr(wherePos + 7));
|
||||
del->setChild("where", w);
|
||||
}
|
||||
module->addChild("statements", del);
|
||||
}
|
||||
|
||||
static void parseProcedure(const std::string& stmt, Module* module) {
|
||||
std::string raw = extractAfterKeyword(stmt, "PROCEDURE ");
|
||||
auto* fn = new Function();
|
||||
fn->id = IdGenerator::next("proc");
|
||||
fn->name = trim(untilDelimiter(raw, " AS"));
|
||||
module->addChild("functions", fn);
|
||||
}
|
||||
|
||||
static void parseDeclare(const std::string& stmt, Module* module) {
|
||||
std::string raw = extractAfterKeyword(stmt, "DECLARE ");
|
||||
std::vector<std::string> parts = splitWhitespace(raw);
|
||||
if (parts.size() < 2) return;
|
||||
|
||||
auto* v = new Variable();
|
||||
v->id = IdGenerator::next("var");
|
||||
v->name = parts[0];
|
||||
v->setChild("type", new PrimitiveType(IdGenerator::next("type"), toUpper(parts[1])));
|
||||
|
||||
auto eqPos = raw.find('=');
|
||||
if (eqPos != std::string::npos) {
|
||||
std::string rhs = trim(raw.substr(eqPos + 1));
|
||||
v->setChild("initializer", parseLiteral(rhs));
|
||||
}
|
||||
module->addChild("variables", v);
|
||||
}
|
||||
|
||||
static void parseSet(const std::string& stmt, Module* module) {
|
||||
std::string raw = extractAfterKeyword(stmt, "SET ");
|
||||
auto eqPos = raw.find('=');
|
||||
if (eqPos == std::string::npos) return;
|
||||
|
||||
auto* assign = new Assignment();
|
||||
assign->id = IdGenerator::next("set");
|
||||
std::string lhs = trim(raw.substr(0, eqPos));
|
||||
std::string rhs = trim(raw.substr(eqPos + 1));
|
||||
assign->setChild("target", new VariableReference(IdGenerator::next("ref"), lhs));
|
||||
assign->setChild("value", parseLiteral(rhs));
|
||||
module->addChild("statements", assign);
|
||||
}
|
||||
|
||||
static void parsePrint(const std::string& stmt, Module* module) {
|
||||
std::string raw = extractAfterKeyword(stmt, "PRINT ");
|
||||
auto* call = new FunctionCall();
|
||||
call->id = IdGenerator::next("call");
|
||||
call->functionName = "PRINT";
|
||||
call->addChild("arguments", parseLiteral(raw));
|
||||
|
||||
auto* es = new ExpressionStatement();
|
||||
es->id = IdGenerator::next("expr");
|
||||
es->setChild("expression", call);
|
||||
module->addChild("statements", es);
|
||||
}
|
||||
|
||||
static ASTNode* parseLiteral(const std::string& tokenRaw) {
|
||||
std::string t = trim(tokenRaw);
|
||||
if (t.empty()) return new NullLiteral();
|
||||
if ((t.front() == '\'' && t.back() == '\'') || (t.front() == '"' && t.back() == '"')) {
|
||||
return new StringLiteral(IdGenerator::next("str"), t.substr(1, t.size() - 2));
|
||||
}
|
||||
if (t == "1" || t == "0") return new IntegerLiteral(IdGenerator::next("int"), std::stoi(t));
|
||||
if (std::all_of(t.begin(), t.end(), [](unsigned char c) { return std::isdigit(c); })) {
|
||||
return new IntegerLiteral(IdGenerator::next("int"), std::stoi(t));
|
||||
}
|
||||
return new VariableReference(IdGenerator::next("ref"), t);
|
||||
}
|
||||
|
||||
static std::string detectJoinType(const std::string& lower, size_t joinPos) {
|
||||
std::string prefix = lower.substr((joinPos > 8 ? joinPos - 8 : 0), 8);
|
||||
if (prefix.find("left") != std::string::npos) return "LEFT";
|
||||
if (prefix.find("right") != std::string::npos) return "RIGHT";
|
||||
if (prefix.find("full") != std::string::npos) return "FULL";
|
||||
return "INNER";
|
||||
}
|
||||
|
||||
static std::vector<std::string> splitStatements(const std::string& source) {
|
||||
std::vector<std::string> out;
|
||||
std::string cur;
|
||||
for (char c : source) {
|
||||
if (c == ';') {
|
||||
if (!trim(cur).empty()) out.push_back(cur);
|
||||
cur.clear();
|
||||
continue;
|
||||
}
|
||||
cur.push_back(c);
|
||||
}
|
||||
if (!trim(cur).empty()) out.push_back(cur);
|
||||
return out;
|
||||
}
|
||||
|
||||
static std::string extractAfterKeyword(const std::string& s, const std::string& keywordUpper) {
|
||||
std::string lower = toLower(s);
|
||||
std::string kw = toLower(keywordUpper);
|
||||
auto pos = lower.find(kw);
|
||||
if (pos == std::string::npos) return "";
|
||||
pos += kw.size();
|
||||
return trim(s.substr(pos));
|
||||
}
|
||||
|
||||
static std::string firstToken(const std::string& s) {
|
||||
std::string t = trim(s);
|
||||
auto end = t.find_first_of(" \t\r\n");
|
||||
if (end == std::string::npos) return t;
|
||||
return t.substr(0, end);
|
||||
}
|
||||
|
||||
static std::string untilDelimiter(const std::string& s, const std::string& delimiterUpper) {
|
||||
std::string lower = toLower(s);
|
||||
std::string d = toLower(delimiterUpper);
|
||||
auto pos = lower.find(d);
|
||||
if (pos == std::string::npos) return s;
|
||||
return s.substr(0, pos);
|
||||
}
|
||||
|
||||
static std::vector<std::string> splitWhitespace(const std::string& s) {
|
||||
std::vector<std::string> out;
|
||||
std::stringstream ss(s);
|
||||
std::string tok;
|
||||
while (ss >> tok) out.push_back(tok);
|
||||
return out;
|
||||
}
|
||||
|
||||
static bool startsWith(const std::string& s, const std::string& prefix) {
|
||||
return s.rfind(prefix, 0) == 0;
|
||||
}
|
||||
|
||||
static std::string toLower(const std::string& s) {
|
||||
std::string out = s;
|
||||
std::transform(out.begin(), out.end(), out.begin(),
|
||||
[](unsigned char c) { return static_cast<char>(std::tolower(c)); });
|
||||
return out;
|
||||
}
|
||||
|
||||
static std::string toUpper(const std::string& s) {
|
||||
std::string out = s;
|
||||
std::transform(out.begin(), out.end(), out.begin(),
|
||||
[](unsigned char c) { return static_cast<char>(std::toupper(c)); });
|
||||
return out;
|
||||
}
|
||||
|
||||
static std::string trim(const std::string& s) {
|
||||
auto start = s.find_first_not_of(" \t\r\n");
|
||||
if (start == std::string::npos) return "";
|
||||
auto end = s.find_last_not_of(" \t\r\n");
|
||||
return s.substr(start, end - start + 1);
|
||||
}
|
||||
};
|
||||
Reference in New Issue
Block a user