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peghs.cpp
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peghs.cpp
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#include "peg.h"
#include "ParseState.h"
#include "Ast.h"
#include "Action.h"
#include <utility>
#include <memory>
#include <cctype>
#include <string>
#include <iostream>
#include <fstream>
#include <vector>
#include <list>
#include <stack>
#include <sstream>
#ifdef _MSC_VER
#define __PRETTY_FUNCTION__ __FUNCTIONW__
#endif
using std::string;
using std::make_shared;
using std::shared_ptr;
using std::cout;
using std::endl;
struct ConID : public ParserBase
{
ConID() : ParserBase("ConID") {}
ParseResultPtr parse(const ParseStatePtr& start)
{
size_t ic = 0;
if (start->length() > 0 && isalpha(start->at(0)) && isupper(start->at(0)))
{
++ic;
while (start->length() > ic && (isalnum(start->at(ic)) || start->at(ic)=='.'))
++ic;
return make_shared<ParseResult>(start->from(ic), std::make_shared<IdentifierAST>(start->substr(0, ic)));
}
return ParseResultPtr();
}
};
bool reservedid(const string& sym)
{
return sym=="case"||sym=="class"||sym=="data"||sym=="default"||
sym=="deriving"||sym=="do"||sym=="else"||sym=="foreign"||
sym=="if"||sym=="import"||sym=="in"||sym=="infix"||sym=="infixl"||
sym=="infixr"||sym=="instance"||sym=="let"||sym=="module"||
sym=="newtype"||sym=="of"||sym=="then"||sym=="type"||sym=="where"||
sym=="_";
}
struct VarID : public ParserBase
{
VarID() : ParserBase("VarID") {}
ParseResultPtr parse(const ParseStatePtr& start)
{
size_t ic = 0;
if (start->length() > 0 && isalpha(start->at(0)) && islower(start->at(0)))
{
++ic;
while (start->length() > ic && (isalnum(start->at(ic))))
++ic;
if (reservedid(start->substr(0,ic)))
return ParseResultPtr();
return make_shared<ParseResult>(start->from(ic), std::make_shared<IdentifierAST>(start->substr(0, ic)));
}
return ParseResultPtr();
}
};
bool reservedOp(const string& sym)
{
/// .. | : | :: | = | \ | | | <- | -> | @ | ~ | =>
// length 2 --- .. | :: | <- | -> | =>
// length 1 --- : | = | \ | | | @ | ~
switch (sym.length())
{
default:
return false;
case 1:
switch (sym[0])
{
case ':': case '=': case '\\': case '|': case '@': case '~':
return true;
}
return false;
case 2:
if (sym[0]=='.' && sym[1]=='.')
return true;
if (sym[0]==':' && sym[1]==':')
return true;
if (sym[0]=='<' && sym[1]=='-')
return true;
if (sym[1]=='>' && (sym[0]=='-' || sym[0]=='='))
return true;
return false;
}
return false;
}
bool asciiSymbolChar(int ch)
{
switch (ch) {
case '!': case '#': case '$': case '%': case '&': case '*': case '+':
case '.': case '/': case '<': case '=': case '>': case '?': case '@':
case '\\': case '^': case '|': case '-': case '~': case ':':
return true;
}
return false;
}
bool asciiSymbolCharExceptColon(int ch)
{
switch (ch) {
case '!': case '#': case '$': case '%': case '&': case '*': case '+':
case '.': case '/': case '<': case '=': case '>': case '?': case '@':
case '\\': case '^': case '|': case '-': case '~':
return true;
}
return false;
}
class CommentAST : public AST
{
public:
CommentAST() {}
string to_string() const { return " "; }
};
struct Comment : public ParserBase
{
Comment() : ParserBase("Comment") {}
ParseResultPtr parse(const ParseStatePtr& start)
{
size_t ic=0;
if (start->length() > 2 && start->at(0)=='-' && start->at(1)=='-')
{
if (start->length()>3 && !asciiSymbolChar(start->at(2)))
{
//The first two chars are dashes and the first three chars are not a symbol
//So we have a comment that ends at a newline
ic=3;
while (start->length()> ic && start->at(ic) != '\n')
++ic;
//return make_shared<ParseResult>(start->from(ic), make_shared<StringAST>(start->substr(0, ic)));
return make_shared<ParseResult>(start->from(ic), make_shared<CommentAST>());
}
}
return ParseResultPtr();
}
};
struct NComment : public ParserBase
{
NComment() : ParserBase("NComment") {}
ParseResultPtr parse(const ParseStatePtr& start)
{
size_t ic=0;
if (start->length() > 4 && start->at(0)=='{' && start->at(1)=='-')
{
//The first two chars open a nested comment.
//So we have a comment that ends at a newline
ic=2;
int open=1;
while (start->length()> ic && open>0)
{
if (start->length() > ic+2*open+1 && start->at(ic)=='{' && start->at(ic)=='-')
{
ic+= 2;
open++;
}
else if (start->length() > ic+1 && start->at(ic) == '-' && start->at(ic+1) == '}')
{
ic+= 2;
open--;
}
else
{
++ic;
}
}
//return make_shared<ParseResult>(start->from(ic), make_shared<StringAST>(start->substr(0, ic)));
return make_shared<ParseResult>(start->from(ic), make_shared<CommentAST>());
}
return ParseResultPtr();
}
};
struct HaskellNumber : public ParserBase
{
HaskellNumber() : ParserBase("HaskellNumber") {}
bool hexLetter(int c)
{
switch (tolower(c))
{
case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
return true;
default:
return false;
}
}
ParseResultPtr parse(const ParseStatePtr& start)
{
size_t ic=0;
if (start->length()> 0 && isdigit(start->at(0)))
{
++ic;
// Definitely some sort of number
if (start->at(0)=='0' && (start->at(1)=='x'||start->at(1)=='X'))
{
++ic; // hex prefix
while (isxdigit(start->at(ic)))
++ic;
if (ic < 3)
return ParseResultPtr();
unsigned long value;
value = strtoul(start->substr(0,ic).c_str(),NULL,16);
return make_shared<ParseResult>(start->from(ic), make_shared<IntegerAST>(value));
}
else if (start->at(0)=='0' && tolower(start->at(1)=='o'))
{
++ic; // octal prefix
while (isdigit(start->at(ic))&& start->at(ic)<'8')
{
++ic;
}
if (ic < 3)
return ParseResultPtr();
unsigned long value;
value = strtoul(start->substr(0,ic).c_str(),NULL,8);
return make_shared<ParseResult>(start->from(ic), make_shared<IntegerAST>(value));
}
// The other cases are decimal integers and floating point numbers
while (isdigit(start->at(ic)))
++ic;
bool parseReal = false;
if (start->at(ic)=='.')
{
parseReal=true;
++ic;
int fstart=ic;
while (isdigit(start->at(ic)))
++ic;
if (ic==fstart) // if no fraction digits, violates lexical level
return ParseResultPtr();
}
if (tolower(start->at(ic))=='e')
{
parseReal=true;
++ic;
int estart = ic;
if (start->at(ic)=='+'||start->at(ic)=='-')
{
++ic;
estart = ic;
}
while (isdigit(start->at(ic)))
++ic;
if (ic==estart)
return ParseResultPtr();
}
if (parseReal)
{
double dvalue;
dvalue = strtod(start->substr(0,ic).c_str(),NULL);
return make_shared<ParseResult>(start->from(ic), make_shared<FloatAST>(dvalue));
}
unsigned long ivalue;
ivalue = strtoul(start->substr(0,ic).c_str(),NULL,8);
return make_shared<ParseResult>(start->from(ic), make_shared<IntegerAST>(ivalue));
}
return ParseResultPtr();
}
};
ParseResultPtr small(const ParseStatePtr& start)
{
if ((islower(start->at(0)) && isalpha(start->at(0)))||start->at(0)=='_')
return make_shared<ParseResult>(start->from(1), make_shared<CharAST>(start->at(0)));
return ParseResultPtr();
}
ParseResultPtr large(const ParseStatePtr& start)
{
if (isupper(start->at(0)) && isalpha(start->at(0)))
return make_shared<ParseResult>(start->from(1), make_shared<CharAST>(start->at(0)));
return ParseResultPtr();
}
ParseResultPtr symbol(const ParseStatePtr& start)
{
if (asciiSymbolChar(start->at(0)))
return make_shared<ParseResult>(start->from(1), make_shared<CharAST>(start->at(0)));
return ParseResultPtr();
}
ParseResultPtr digit(const ParseStatePtr& start)
{
if (isdigit(start->at(0)))
return make_shared<ParseResult>(start->from(1), make_shared<CharAST>(start->at(0)));
return ParseResultPtr();
}
ParseResultPtr special(const ParseStatePtr& start)
{
switch (start->at(0))
{
case '(': case ')': case ',': case ';': case '[': case ']': case '`': case '{': case '}':
return make_shared<ParseResult>(start->from(1), make_shared<CharAST>(start->at(0)));
}
return ParseResultPtr();
}
ParseResultPtr graphic(const ParseStatePtr& start)
{
// small | large | symbol | digit | special | " | '
ParseResultPtr r = small(start);
if (r) return r;
r = large(start);
if (r) return r;
r = symbol(start);
if (r) return r;
r = digit(start);
if (r) return r;
r = special(start);
if (r) return r;
if (start->at(0)=='"' || start->at(0)=='\'')
{
return make_shared<ParseResult>(start->from(1), make_shared<CharAST>(start->at(0)));
}
return ParseResultPtr();
}
ParseResultPtr asciiEscape(const ParseStatePtr& start)
{
size_t ic = 0;
if (start->at(ic)=='^')
{
++ic;
if (isupper(start->at(ic))&&isalpha(start->at(ic)))
return make_shared<ParseResult>(start->from(2), make_shared<CharAST>(start->at(ic)-64));
else switch (start->at(ic))
{
case '@': case '[': case '\\': case ']': case '^': case '_':
return make_shared<ParseResult>(start->from(2), make_shared<CharAST>(start->at(ic)-64));
default:
return ParseResultPtr();
}
}
// We tried ^something, let's try the names now
// The overall effect is that '\NUL' is a legitimate character literal.
int v = -1;
string nm;
if (start->length()>=2) // the two-letter names are possible
{
nm = start->substr(0,2);
if (nm == "BS") v=8;
else if (nm == "HT") v=9;
else if (nm == "LF") v=10;
else if (nm == "VT") v=11;
else if (nm == "FF") v=12;
else if (nm == "CR") v=13;
else if (nm == "SO") v=14;
else if (nm == "SI") v=15;
else if (nm == "EM") v=25;
else if (nm == "FS") v=28;
else if (nm == "GS") v=29;
else if (nm == "RS") v=30;
else if (nm == "US") v=31;
else if (nm == "SP") v=32;
}
if (v==-1 && start->length()>=3) // three-letter possibilities
{
nm = start->substr(0,3);
if (nm=="NUL") v=0; else if (nm=="SOH") v=1; else if (nm=="STX") v=2; else if (nm=="ETX") v=3; else if (nm=="EOT") v=4; else if (nm=="ENQ") v=5; else if (nm=="ACK") v=6; else if (nm=="BEL") v=7;
else if (nm=="DLE") v=16; else if (nm=="DC1") v=17; else if (nm=="DC2") v=18; else if (nm=="DC3") v=19; else if (nm=="DC4") v=20; else if (nm=="NAK") v=21; else if (nm=="SYN") v=22; else if (nm=="ETB") v=23;
else if (nm=="CAN") v=24;
else if (nm=="SUB") v=26; else if (nm=="ESC") v=27;
else if (nm=="DEL") v=127;
}
if (v != -1)
{
return make_shared<ParseResult>(start->from(nm.size()), make_shared<CharAST>(v));
}
return ParseResultPtr();
}
ParseResultPtr escape(const ParseStatePtr& start)
{
size_t ic = 0;
if (start->at(ic)!='\\')
{
cout << "escape: Not a backslash here." << endl;
return ParseResultPtr();
}
if (start->at(ic)=='\\')
{
++ic;
int v = -1;
switch (start->at(ic))
{
case 'a':
v = 7;
break;
case 'b':
v = 8;
break;
case 'f':
v = 12;
break;
case 'n':
v = 10;
break;
case 'r':
v = 13;
break;
case 't':
v = 9;
break;
case 'v':
v = 11;
break;
case '\\':
v = '\\';
break;
case '"':
v = '"';
break;
case '\'':
v = '\'';
break;
case '&':
v = -2;
break;
default:
break;
}
if (v==-2)
return make_shared<ParseResult>(start->from(2), make_shared<CharAST>(-1));
if (v!=-1)
return make_shared<ParseResult>(start->from(2), make_shared<CharAST>(v));
if (isdigit(start->at(ic)))
{
++ic;
while (isdigit(start->at(ic)))
++ic;
unsigned long value = strtoul(start->substr(1,ic).c_str(),NULL,10);
return make_shared<ParseResult>(start->from(ic), make_shared<CharAST>(value));
}
if (start->at(ic)=='x')
{
++ic;
while (isxdigit(start->at(ic)))
++ic;
unsigned long value = strtoul(start->substr(2,ic).c_str(),NULL,16);
return make_shared<ParseResult>(start->from(ic), make_shared<CharAST>(value));
}
if (start->at(ic)=='o')
{
++ic;
while (isdigit(start->at(ic)) && start->at(ic)<'8')
++ic;
unsigned long value = strtoul(start->substr(2,ic).c_str(),NULL,8);
return make_shared<ParseResult>(start->from(ic), make_shared<CharAST>(value));
}
ParseResultPtr r = asciiEscape(start->from(1));
if (r)
{
return make_shared<ParseResult>(r->getState(), r->getAST());
}
//
}
return ParseResultPtr();
}
string AppendRepToString(int chr, const string& dest)
{
string out = dest;
switch (chr)
{
case 0:
out += "\\NUL"; break;
case 1:
out += "\\SOH"; break;
case 2:
out += "\\STX"; break;
case 3:
out += "\\ETX"; break;
case 4:
out += "\\EOT"; break;
case 5:
out += "\\ENQ"; break;
case 6:
out += "\\ACK"; break;
case 7:
out += "\\a"; break;
case 8:
out += "\\b"; break;
case 9:
out += "\\t"; break;
case 10:
out += "\\n"; break;
case 11:
out += "\\v"; break;
case 12:
out += "\\f"; break;
case 13:
out += "\\r"; break;
case 14:
out += "\\SO"; break;
case 15:
out += "\\SI"; break;
case 16:
out += "\\DLE"; break;
case 17:
out += "\\DC1"; break;
case 18:
out += "\\DC2"; break;
case 19:
out += "\\DC3"; break;
case 20:
out += "\\DC4"; break;
case 21:
out += "\\NAK"; break;
case 22:
out += "\\SYN"; break;
case 23:
out += "\\ETB"; break;
case 24:
out += "\\CAN"; break;
case 25:
out += "\\EM"; break;
case 26:
out += "\\SUB"; break;
case 27:
out += "\\ESC"; break;
case 28:
out += "\\FS"; break;
case 29:
out += "\\GS"; break;
case 30:
out += "\\RS"; break;
case 31:
out += "\\US"; break;
case '"':
out += "\\\""; break;
case '\\':
out += "\\\\"; break;
default:
out += chr;
break;
}
return out;
}
class HaskellCharAST : public AST
{
public:
HaskellCharAST(const std::string& name) : name(name) {}
explicit HaskellCharAST(int name) : name(1,name) {}
std::string to_string() const {
string out = "'";
out = AppendRepToString(name[0], out);
out += "'";
return out;
}
private:
std::string name;
};
class Char : public ParserBase
{
public:
Char() : ParserBase("Char") {}
ParseResultPtr parse(const ParseStatePtr& start)
{
size_t ic = 0;
//'(graphic<'|\> | space | escape<\&>)'
if (start->at(ic)=='\'')
{
++ic;
if (start->at(ic)!='\''&&start->at(ic)!='\\')
{
ParseResultPtr r = graphic(start->from(ic));
if (start->at(ic+1)=='\'')
return make_shared<ParseResult>(start->from(ic+2), make_shared<HaskellCharAST>(r->getAST()->to_string()));
return ParseResultPtr();
}
if (start->at(ic)==' ' && start->at(ic+1)=='\'')
return make_shared<ParseResult>(start->from(ic+2), make_shared<HaskellCharAST>(start->at(ic)));
if (start->at(ic)=='\\' && start->at(ic+1)!='&') // the special ampersand has no role in Char.
{
ParseResultPtr r = escape(start->from(ic));
// r is true if it is an escape
// r->getAST is the escape data to return
// r->getState is the state after the escape.
if (r)
{
if (r->getState()->at(0)=='\'')
{
return make_shared<ParseResult>(r->getState()->from(1), make_shared<HaskellCharAST>(r->getAST()->to_string()));
}
}
}
}
return ParseResultPtr();
}
};
class HaskellStringAST : public AST
{
public:
HaskellStringAST(const std::string& name) : name(name) {}
std::string to_string() const {
string out = "\"";
for (auto pc=name.begin(); pc!=name.end(); ++pc)
{
out = AppendRepToString(*pc, out);
}
out += '"';
return out;
}
private:
std::string name;
};
class String : public ParserBase
{
public:
String() : ParserBase("String") {}
ParseResultPtr parse(const ParseStatePtr& start)
{
extern bool showFails;
//size_t ic = 0;
ParseStatePtr t1 = start;
if (t1->at(0)=='"')
{
t1 = t1->from(1);
string content;
while (t1->at(0)!='"')
{
//cout << "String: watch your head: " << (char)t1->at(0) << " ("<<t1->at(0)<<")" << endl;
if (t1->at(0)!='"' && t1->at(0)!='\\')
{
//cout << "String: Graphic path" << endl;
ParseResultPtr r = graphic(t1->from(0));
if (r)
{
//cout << "String: adding " << r->getAST()->to_string() << "/" << endl;
content += r->getAST()->to_string();
t1 = r->getState();
continue;
}
}
if (t1->at(0)==' ') // not isspace(), just the one character.
{
content += ' ';
t1 = t1->from(1);
}
else if (t1->at(0)=='\\')
{
//cout << "String: got " << char(t1->at(0)) << endl;
if (isspace(t1->at(1)))
{
//cout << "String: assaying a gap." << endl;
size_t ic = 1;
while (isspace(t1->at(ic)))
++ic;
if (t1->at(ic)=='\\')
{
t1 = t1->from(ic+1);
}
else
{
if (showFails) std::cout << name << " failed [" << t1->substr(ic) << "] at " << __LINE__ << std::endl;
if (showFails) std::cout << "because gap didn't end with '\\' " << __LINE__ << std::endl;
return ParseResultPtr();
}
}
else
{
//cout << "String: let's see the escape " << endl;
ParseResultPtr r = escape(t1);
//if (r) cout << "String: got to " << char(r->getState()->at(0));
//if (r) cout << " and parsed " << r->getAST()->to_string();
//cout << endl;
//if (!r) cout << "String: escape failed at " << *t1->from(1) << endl;
if (r)
{
content += r->getAST()->to_string();
t1 = r->getState();
}
else
{
if (showFails) std::cout << name << " failed [" << t1->substr(0) << "] at " << __LINE__ << std::endl;
if (showFails) std::cout << "because escape() didn't see something." << __LINE__ << std::endl;
return ParseResultPtr();
}
}
}
}
// The content is ready to go and hopefully t1->at(0) is a double-quote
if (t1->at(0) == '"')
{
return make_shared<ParseResult>(t1->from(1), make_shared<HaskellStringAST>(content));
}
}
if (showFails) std::cout << name << " failed";
extern bool showRemainder;
if (showRemainder) std::cout <<" [" << t1->substr(0) << "]";
if (showFails || showRemainder) std::cout << " at " << __LINE__ << std::endl;
return ParseResultPtr();
}
};
struct ReservedOp : public ParserBase
{
ParseResultPtr parse(const ParseStatePtr& start)
{
size_t ic = 0;
if (start->length() > 0 && asciiSymbolChar(start->at(0)))
{
++ic;
while (start->length() > ic && (asciiSymbolChar(start->at(ic))))
++ic;
if (!reservedOp(start->substr(0,ic)))
return ParseResultPtr();
return make_shared<ParseResult>(start->from(ic), std::make_shared<IdentifierAST>(start->substr(0, ic)));
}
return ParseResultPtr();
}
};
struct VarSym : public ParserBase
{
VarSym() : ParserBase("VarSym") {}
ParseResultPtr parse(const ParseStatePtr& start)
{
size_t ic = 0;
if (start->length() > 0 && asciiSymbolCharExceptColon(start->at(0)))
{
++ic;
while (start->length() > ic && (asciiSymbolChar(start->at(ic))))
++ic;
//cout << "tentative VarSym [" << start->substr(0,ic) << ']' << endl;
if (reservedOp(start->substr(0,ic)))
{
//cout << "reservedop NOT VarSym [" << start->substr(0,ic) << ']' << endl;
return ParseResultPtr();
}
//cout << "VarSym [" << start->substr(0,ic) << ']' << endl;
return make_shared<ParseResult>(start->from(ic), std::make_shared<IdentifierAST>(start->substr(0, ic)));
}
return ParseResultPtr();
}
};
struct ConSym : public ParserBase
{
ConSym() : ParserBase("ConSym") {}
ParseResultPtr parse(const ParseStatePtr& start)
{
size_t ic = 0;
if (start->length() > 0 && start->at(0)==':')
{
++ic;
while (start->length() > ic && (asciiSymbolChar(start->at(ic))))
++ic;
if (reservedOp(start->substr(0,ic)))
return ParseResultPtr();
cout <<"ConSym [" << start->substr(0,ic) << ']' << endl;
return make_shared<ParseResult>(start->from(ic), std::make_shared<IdentifierAST>(start->substr(0, ic)));
}
return ParseResultPtr();
}
};
// Quoted strings in HTML can use either the single quote or
// the double quote. HTML doesn't allow escaping the quoting
// character but an entity ' or "e; can be used.
template <int quote> struct Quoted : public ParserBase
{
Quoted() : ParserBase("Quoted-"+string(1,quote)) {}
ParseResultPtr parse(const ParseStatePtr& start)
{
size_t ic =0;
if (start->length() < 2)
return ParseResultPtr();
if (start->at(0) != quote)
return ParseResultPtr();
++ic;
while (ic < start->length()-1 && start->at(ic) != quote)
{
if (start->at(ic)=='\\')
++ic;
++ic;
}
if (start->at(ic) != quote)
return ParseResultPtr();
return make_shared<ParseResult>(start->from(ic+1), std::make_shared<StringAST>(start->substr(0, ic+1)));
}
};
shared_ptr<Choices> ChoicesName(const std::string& name)
{
shared_ptr<Choices> r = make_shared<Choices>(name);
return r;
}
shared_ptr<WSequenceN> SequenceName(const std::string& name)
{
shared_ptr<WSequenceN> r = make_shared<WSequenceN>(name);
return r;
}
// When you want a parse's failure to be a good thing.
// This parser does not "consume" input.
#if 0
template <typename Parser> struct isnt : public ParserBase
{
isnt(const shared_ptr<Parser>& next) : next(next) {}
ParseResultPtr parse(const ParseStatePtr& start)
{
ParseResultPtr rep = (*next)(start);
if (!rep) // don't advance, but do succeed
return make_shared<ParseResult>(start->from(0), std::make_shared<StringAST>(""));
return ParseResultPtr(); // whatever it is, is present, so fail.
}
shared_ptr<Parser> next;
};
template <typename Parser> shared_ptr<isnt<Parser>> Isnt(const shared_ptr<Parser>& parser)
{
return make_shared<isnt<Parser>>(parser);
}
#else
struct isnt : public ParserBase
{
isnt(const shared_ptr<ParserBase>& next) : next(next) {}
static int recur;
ParseResultPtr parse(const ParseStatePtr& start)
{
if (recur== next->parser_id || recur != 0)
{
cout << __PRETTY_FUNCTION__ << " Recursion? " << endl;
return ParseResultPtr();
}
recur = next->parser_id;
ParseResultPtr rep = (*next)(start);
if (!rep) // don't advance, but do succeed
{
recur = 0;
return make_shared<ParseResult>(start->from(0), std::make_shared<StringAST>(""));
}
cout << __PRETTY_FUNCTION__ << " Is failing! " << rep->getAST() << endl;
recur = 0;
return ParseResultPtr(); // whatever it is, is present, so fail.
}
shared_ptr<ParserBase> next;
};
int isnt::recur=0;
shared_ptr<ParserBase> Isnt(const shared_ptr<ParserBase>& parser)
{
return make_shared<isnt>(parser);
}
#endif
extern const char module_kw[] = "module";
extern const char where_kw[] = "where";
extern const char qualified_kw[] = "qualified";
extern const char import_kw[] = "import";
extern const char as_kw[] = "as";
extern const char hiding_kw[] = "hiding";
extern const char let_kw[] = "let";
extern const char in_kw[] = "in";
extern const char if_kw[] = "if";
extern const char then_kw[] = "then";
extern const char else_kw[] = "else";
extern const char case_kw[] = "case";
extern const char of_kw[] = "of";
extern const char do_kw[] = "do";
extern const char type_kw[] = "type";
extern const char data_kw[] = "data";
extern const char newtype_kw[] = "newtype";
extern const char class_kw[] = "class";
extern const char instance_kw[] = "instance";
extern const char default_kw[] = "default";
extern const char foreign_kw[] = "foreign";
extern const char deriving_kw[] = "deriving";
extern const char safe_kw[] = "safe";
extern const char unsafe_kw[] = "unsafe";
extern const char ccall_kw[] = "ccall";
extern const char stdcall_kw[] = "stdcall";
extern const char cplusplus_kw[] = "cplusplus";
extern const char jvm_kw[] = "jvm";
extern const char dotnet_kw[] = "dotnet_kw";
extern const char export_kw[] = "export";
extern const char infix_kw[] = "infix";
extern const char infixl_kw[] = "infixl";
extern const char infixr_kw[] = "infixr";
typedef ttoken<module_kw> ModuleKw;
typedef ttoken<where_kw> WhereKw;
typedef ttoken<qualified_kw> QualifiedKW;
typedef ttoken<import_kw> ImportKW;
typedef ttoken<as_kw> AsKW;
typedef ttoken<hiding_kw> HidingKW;
typedef ttoken<let_kw> LetKW;
typedef ttoken<in_kw> InKW;
typedef ttoken<if_kw> IfKW;
typedef ttoken<then_kw> ThenKW;
typedef ttoken<else_kw> ElseKW;
typedef ttoken<case_kw> CaseKW;
typedef ttoken<of_kw> OfKW;
typedef ttoken<do_kw> DoKW;
typedef ttoken<type_kw> TypeKW;
typedef ttoken<data_kw> DataKW;
typedef ttoken<newtype_kw> NewtypeKW;
typedef ttoken<class_kw> ClassKW;
typedef ttoken<instance_kw> InstanceKW;
typedef ttoken<default_kw> DefaultKW;
typedef ttoken<foreign_kw> ForeignKW;
typedef ttoken<deriving_kw> DerivingKW;
typedef ttoken<safe_kw> SafeKW;
typedef ttoken<unsafe_kw> UnsafeKW;
typedef ttoken<ccall_kw> CcallKw;
typedef ttoken<stdcall_kw> StdcallKw;
typedef ttoken<cplusplus_kw> CplusplusKw;
typedef ttoken<jvm_kw> JvmKw;
typedef ttoken<dotnet_kw> DotnetKw;
typedef ttoken<export_kw> ExportKw;
extern const char colonColonStr[] = "::";
extern const char fnToStr[] = "->";
extern const char patFromStr[] = "<-";
extern const char dotdotStr[] = "..";
extern const char contextToStr[] = "=>";
typedef ttoken<colonColonStr> ColonColon;
typedef ttoken<fnToStr> FnTo;
typedef ttoken<dotdotStr> DotDot;
typedef ttoken<contextToStr> ContextTo;
typedef ttoken<patFromStr> PatFrom;
class DeclAST : public AST
{
public:
DeclAST(const ASTPtr& lhs, const ASTPtr& rhs)
: lhs(lhs), rhs(rhs)
{
}
string to_string() const
{
return "Decl " + lhs->to_string() + " " + rhs->to_string();
}
ASTPtr lhs;
ASTPtr rhs;
};
class DeclTypeAST : public AST
{
public:
DeclTypeAST(const ASTPtr& lhs, const ASTPtr& sign, const ASTPtr& rhs)
: lhs(lhs), sign(sign), rhs(rhs)
{
}
string to_string() const
{
return "DeclT " + lhs->to_string() + sign->to_string() + rhs->to_string();
}
ASTPtr lhs;
ASTPtr sign;
ASTPtr rhs;
};
ASTPtr Decl(const ASTPtr& ast)
{
cout << __PRETTY_FUNCTION__ << endl;
SequenceAST* sequence = dynamic_cast<SequenceAST*>(ast.get());
if (sequence)
{
cout << "Decl 0: " << sequence->at(0)->to_string() << endl;
if (sequence->size()>1)
{
if (sequence->at(1)->to_string()=="::" && sequence->size()==3)
{
cout << "Decl 1: " << sequence->at(1)->to_string() << endl;
cout << "Decl 2: " << sequence->at(2)->to_string() << endl;
return make_shared<DeclTypeAST>(sequence->at(0), sequence->at(1), sequence->at(2));
}
if (sequence->size()==2)
{
cout << "Decl 1: " << sequence->at(1)->to_string() << endl;
return make_shared<DeclAST>(sequence->at(0), sequence->at(1));
}
}
cout << "Decl not sure" << endl;
}
else
{
cout << "Decl that's not a sequence: " << ast->to_string() << endl;
}
return ast;
}
class LetAST : public AST
{
public:
LetAST(const ASTPtr& id, const ASTPtr& def)
: id(id), def(def)
{
}
string to_string() const
{
return "Let "+id->to_string()+"="+def->to_string();
}
ASTPtr id;
ASTPtr def;
};
ASTPtr LetClause(const ASTPtr& ast)
{
cout << __PRETTY_FUNCTION__ << endl;
SequenceAST* sequence = dynamic_cast<SequenceAST*>(ast.get());
if (sequence)
{
cout << "Let 0: " << sequence->at(0)->to_string() << endl;
if (sequence->size()>1)
{
cout << "Let 1: " << sequence->at(1)->to_string() << endl;
return make_shared<LetAST>(sequence->at(0), sequence->at(1));
}