From 966fe28c59f59fc8be795c8215b9352435982445 Mon Sep 17 00:00:00 2001 From: Aki Date: Thu, 30 Sep 2021 16:46:36 +0200 Subject: Merged nGenEx and Parser into Stars45 --- Stars45/Token.cpp | 570 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 570 insertions(+) create mode 100644 Stars45/Token.cpp (limited to 'Stars45/Token.cpp') diff --git a/Stars45/Token.cpp b/Stars45/Token.cpp new file mode 100644 index 0000000..857791b --- /dev/null +++ b/Stars45/Token.cpp @@ -0,0 +1,570 @@ +/* Starshatter OpenSource Distribution + Copyright (c) 1997-2004, Destroyer Studios LLC. + All Rights Reserved. + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are met: + + * Redistributions of source code must retain the above copyright notice, + this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above copyright notice, + this list of conditions and the following disclaimer in the documentation + and/or other materials provided with the distribution. + * Neither the name "Destroyer Studios" nor the names of its contributors + may be used to endorse or promote products derived from this software + without specific prior written permission. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE + LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + POSSIBILITY OF SUCH DAMAGE. + + SUBSYSTEM: Parser + FILE: Token.cpp + AUTHOR: John DiCamillo + + + OVERVIEW + ======== + Scanner class implementation +*/ + +#include "MemDebug.h" +#include "Token.h" +#include "Reader.h" +#include "Text.h" + +#include + +// +-------------------------------------------------------------------+ + +bool Token::hidecom = true; +char Token::combeg[3] = "//"; +char Token::comend[3] = "\n"; +char Token::altbeg[3] = "/*"; +char Token::altend[3] = "*/"; +Dictionary Token::keymap; + +// +-------------------------------------------------------------------+ + +Token::Token() + : mType(Undefined), mKey(0), mLine(0), mColumn(0) +{ + mLength = 0; + mSymbol[0] = '\0'; +} + +Token::Token(const Token& rhs) + : mType(rhs.mType), mKey(rhs.mKey), mLine(rhs.mLine), mColumn(rhs.mColumn) +{ + mLength = rhs.mLength; + if (mLength < 8) { + strcpy_s(mSymbol, rhs.mSymbol); + } + else { + mFullSymbol = new(__FILE__, __LINE__) char[mLength + 1]; + strcpy(mFullSymbol, rhs.mFullSymbol); + } +} + +Token::Token(int t) + : mType(t), mKey(0), mLine(0), mColumn(0) +{ + mLength = 0; + mSymbol[0] = '\0'; +} + +Token::Token(const char* s, int t, int k, int l, int c) + : mType(t), mKey(k), mLine(l), mColumn(c) +{ + mLength = strlen(s); + if (mLength < 8) { + strcpy_s(mSymbol, s); + } + else { + mFullSymbol = new(__FILE__, __LINE__) char[mLength + 1]; + strcpy(mFullSymbol, s); + } +} + +Token::Token(const Text& s, int t, int k, int l, int c) + : mType(t), mKey(k), mLine(l), mColumn(c) +{ + mLength = s.length(); + if (mLength < 8) { + strcpy_s(mSymbol, s.data()); + } + else { + mFullSymbol = new(__FILE__, __LINE__) char[mLength + 1]; + strcpy(mFullSymbol, s.data()); + } +} + +Token::~Token() +{ + if (mLength >= 8) + delete [] mFullSymbol; +} + +// +-------------------------------------------------------------------+ + +void +Token::close() +{ + keymap.clear(); +} + +// +-------------------------------------------------------------------+ + +Token& +Token::operator = (const Token& rhs) +{ + if (mLength >= 8) + delete [] mFullSymbol; + + mLength = rhs.mLength; + if (mLength < 8) { + strcpy_s(mSymbol, rhs.mSymbol); + } + else { + mFullSymbol = new(__FILE__, __LINE__) char[mLength + 1]; + strcpy(mFullSymbol, rhs.mFullSymbol); + } + + mType = rhs.mType; + mKey = rhs.mKey; + mLine = rhs.mLine; + mColumn = rhs.mColumn; + + return *this; +} + +// +-------------------------------------------------------------------+ + +bool +Token::match(const Token& ref) const +{ + if (mType == ref.mType) { // if types match + if (ref.mLength == 0) // if no symbol to match + return true; // match! + + else if (mLength == ref.mLength) { // else if symbols match + if (mLength < 8) { + if (!strcmp(mSymbol, ref.mSymbol)) + return true; // match! + } + else { + if (!strcmp(mFullSymbol, ref.mFullSymbol)) + return true; // match! + } + } + } + + return false; +} + +// +-------------------------------------------------------------------+ + +Text +Token::symbol() const +{ + if (mLength < 8) + return Text(mSymbol); + else + return Text(mFullSymbol); +} + +// +-------------------------------------------------------------------+ + +void +Token::addKey(const Text& k, int v) +{ + keymap.insert(k, v); +} + +// +-------------------------------------------------------------------+ + +void +Token::addKeys(Dictionary& keys) +{ + DictionaryIter iter = keys; + while (++iter) + keymap.insert(iter.key(), iter.value()); +} + +// +-------------------------------------------------------------------+ + +bool +Token::findKey(const Text& k, int& v) +{ + if (keymap.contains(k)) { + v = keymap.find(k, 0); + return true; + } + else + return false; +} + +// +-------------------------------------------------------------------+ + +void +Token::comments(const Text& begin, const Text& end) +{ + combeg[0] = begin(0); + if (begin.length() > 1) combeg[1] = begin(1); + else combeg[1] = '\0'; + + comend[0] = end(0); + if (end.length() > 1) comend[1] = end(1); + else comend[1] = '\0'; +} + +// +-------------------------------------------------------------------+ + +void +Token::altComments(const Text& begin, const Text& end) +{ + altbeg[0] = begin(0); + if (begin.length() > 1) altbeg[1] = begin(1); + else altbeg[1] = '\0'; + + altend[0] = end(0); + if (end.length() > 1) altend[1] = end(1); + else altend[1] = '\0'; +} + +// +-------------------------------------------------------------------+ + +Text +Token::typestr() const +{ + Text t = "Unknown"; + switch (type()) { + case Undefined: t = "Undefined"; break; + case Keyword: t = "Keyword"; break; + case AlphaIdent: t = "AlphaIdent"; break; + case SymbolicIdent: t = "SymbolicIdent"; break; + case Comment: t = "Comment"; break; + case IntLiteral: t = "IntLiteral"; break; + case FloatLiteral: t = "FloatLiteral"; break; + case StringLiteral: t = "StringLiteral"; break; + case CharLiteral: t = "CharLiteral"; break; + case Dot: t = "Dot"; break; + case Comma: t = "Comma"; break; + case Colon: t = "Colon"; break; + case Semicolon: t = "Semicolon"; break; + case LParen: t = "LParen"; break; + case RParen: t = "RParen"; break; + case LBracket: t = "LBracket"; break; + case RBracket: t = "RBracket"; break; + case LBrace: t = "LBrace"; break; + case RBrace: t = "RBrace"; break; + case EOT: t = "EOT"; break; + case LastTokenType: t = "LastTokenType"; break; + } + + return t; +} + +// +-------------------------------------------------------------------+ + +Text +Token::describe(const Text& tok) +{ + Text d; + + switch (tok(0)) { + case '.' : d = "Token::Dot"; break; + case ',' : d = "Token::Comma"; break; + case ';' : d = "Token::Semicolon"; break; + case '(' : d = "Token::LParen"; break; + case ')' : d = "Token::RParen"; break; + case '[' : d = "Token::LBracket"; break; + case ']' : d = "Token::RBracket"; break; + case '{' : d = "Token::LBrace"; break; + case '}' : d = "Token::RBrace"; break; + default : break; + } + + if (d.length() == 0) { + if (isalpha(tok(0))) + d = "\"" + tok + "\", Token::AlphaIdent"; + else if (isdigit(tok(0))) { + if (tok.contains(".")) + d = "\"" + tok + "\", Token::FloatLiteral"; + else + d = "\"" + tok + "\", Token::IntLiteral"; + } + else + d = "\"" + tok + "\", Token::SymbolicIdent"; + } + + return d; +} + +// +-------------------------------------------------------------------+ + +Scanner::Scanner(Reader* r) + : reader(r), str(0), index(0), old_index(0), + length(0), line(0), old_line(0), lineStart(0) +{ } + +Scanner::Scanner(const Scanner& rhs) + : index(rhs.index), old_index(rhs.old_index), length(rhs.length), + reader(rhs.reader), + line(rhs.line), old_line(0), lineStart(rhs.lineStart) +{ + str = new(__FILE__, __LINE__) char [strlen(rhs.str) + 1]; + strcpy(str, rhs.str); +} + +Scanner::Scanner(const Text& s) + : reader(0), index(0), old_index(0), length(s.length()), line(0), + old_line(0), lineStart(0) +{ + str = new(__FILE__, __LINE__) char [s.length() + 1]; + strcpy(str, s.data()); +} + +Scanner::~Scanner() +{ + delete [] str; +} + +// +-------------------------------------------------------------------+ + +Scanner& +Scanner::operator = (const Scanner& rhs) +{ + delete [] str; + str = new(__FILE__, __LINE__) char [strlen(rhs.str) + 1]; + strcpy(str, rhs.str); + + index = rhs.index; + old_index = rhs.old_index; + length = rhs.length; + line = rhs.line; + old_line = rhs.old_line; + lineStart = rhs.lineStart; + + return *this; +} + +// +-------------------------------------------------------------------+ + +void +Scanner::Load(const Text& s) +{ + delete [] str; + str = new(__FILE__, __LINE__) char [s.length() + 1]; + strcpy(str, s.data()); + + index = 0; + old_index = 0; + best = Token(); + length = s.length(); + line = 0; + old_line = 0; + lineStart = 0; +} + +// +-------------------------------------------------------------------+ + +Token +Scanner::Get(Need need) +{ + int type = Token::EOT; + old_index = index; + old_line = line; + + eos = str + length; + p = str + index; + + if (p >= eos) { + if (need == Demand && reader) { + Load(reader->more()); + if (length > 0) + return Get(need); + } + return Token("", type, 0, line, 0); + } + + while (isspace(*p) && p < eos) { // skip initial white space + if (*p == '\n') { + line++; + lineStart = p - str; + } + p++; + } + + if (p >= eos) { + if (need == Demand && reader) { + Load(reader->more()); + if (length > 0) + return Get(need); + } + return Token("", type, 0, line, 0); + } + + Token result; + size_t start = p - str; + + if (*p == '"' || *p == '\'') { // special case for quoted tokens + + if (*p == '"') type = Token::StringLiteral; + else type = Token::CharLiteral; + + char match = *p; + while (++p < eos) { + if (*p == match) { // find matching quote + if (*(p-1) != '\\') { // if not escaped + p++; // token includes matching quote + break; + } + } + } + } + + // generic delimited comments + else if (*p == Token::comBeg(0) && + (!Token::comBeg(1) || *(p+1) == Token::comBeg(1))) { + type = Token::Comment; + while (++p < eos) { + if (*p == Token::comEnd(0) && + (!Token::comEnd(1) || *(p+1) == Token::comEnd(1))) { + p++; if (Token::comEnd(1)) p++; + break; + } + } + } + + // alternate form delimited comments + else if (*p == Token::altBeg(0) && + (!Token::altBeg(1) || *(p+1) == Token::altBeg(1))) { + type = Token::Comment; + while (++p < eos) { + if (*p == Token::altEnd(0) && + (!Token::altEnd(1) || *(p+1) == Token::altEnd(1))) { + p++; if (Token::altEnd(1)) p++; + break; + } + } + } + + else if (*p == '.') type = Token::Dot; + else if (*p == ',') type = Token::Comma; + else if (*p == ';') type = Token::Semicolon; + else if (*p == '(') type = Token::LParen; + else if (*p == ')') type = Token::RParen; + else if (*p == '[') type = Token::LBracket; + else if (*p == ']') type = Token::RBracket; + else if (*p == '{') type = Token::LBrace; + else if (*p == '}') type = Token::RBrace; + + // use lexical sub-parser for ints and floats + else if (isdigit(*p)) + type = GetNumeric(); + + else if (IsSymbolic(*p)) { + type = Token::SymbolicIdent; + while (IsSymbolic(*p)) p++; + } + + else { + type = Token::AlphaIdent; + while (IsAlpha(*p)) p++; + } + + size_t extent = (p - str) - start; + + if (extent < 1) extent = 1; // always get at least one character + + index = start + extent; // advance the cursor + int col = start - lineStart; + if (line == 0) col++; + + char* buf = new(__FILE__, __LINE__) char [extent + 1]; + strncpy(buf, str + start, extent); + buf[extent] = '\0'; + + if (type == Token::Comment && Token::hidecom) { + delete [] buf; + if (Token::comEnd(0) == '\n') { + line++; + lineStart = p - str; + } + return Get(need); + } + + if (type == Token::AlphaIdent || // check for keyword + type == Token::SymbolicIdent) { + int val; + if (Token::findKey(Text(buf), val)) + result = Token(buf, Token::Keyword, val, line+1, col); + } + + if (result.mType != Token::Keyword) + result = Token(buf, type, 0, line+1, col); + + if (line+1 > (size_t) best.mLine || + (line+1 == (size_t) best.mLine && col > best.mColumn)) + best = result; + + delete [] buf; + return result; +} + +// +-------------------------------------------------------------------+ + +int +Scanner::GetNumeric() +{ + int type = Token::IntLiteral; // assume int + + if (*p == '0' && *(p+1) == 'x') { // check for hex: + p += 2; + while (isxdigit(*p)) p++; + return type; + } + + while (isdigit(*p) || *p == '_') p++; // whole number part + + if (*p == '.') { p++; // optional fract part + type = Token::FloatLiteral; // implies float + + while (isdigit(*p) || *p == '_') p++; // fractional part + } + + if (*p == 'E' || *p == 'e') { p++; // optional exponent + if (*p == '+' || *p == '-') p++; // which may be signed + while (isdigit(*p)) p++; + + type = Token::FloatLiteral; // implies float + } + + return type; +} + +// +-------------------------------------------------------------------+ + +bool +Scanner::IsAlpha(char c) +{ + return (isalpha(*p) || isdigit(*p) || (*p == '_'))?true:false; +} + +// +-------------------------------------------------------------------+ + +bool +Scanner::IsSymbolic(char c) +{ + const char* s = "+-*/\\<=>~!@#$%^&|:"; + return strchr(s, c)?true:false; +} -- cgit v1.1