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371 lines
9.8 KiB
371 lines
9.8 KiB
%{
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/* compile: leg -o parse.c parse.leg
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* cc -o parse parse.c
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*
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* run: echo "3+4" | ./parse
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*/
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#define DO_PROTOS() _DO(map) _DO(declar) _DO(assign) _DO(symbol) _DO(integer) _DO(string) _DO(add) _DO(sub) _DO(mul) _DO(div) _DO(mod) _DO(member)
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typedef enum {
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t_UNDEFINED=0,
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#define _DO(NAME) t_##NAME,
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DO_PROTOS()
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#undef _DO
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} proto_t;
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#define SYMBOL_PAYLOAD proto_t prototype;
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#include "object.c"
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// this is the global scope
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oop globals;
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oop apply(oop function, oop parameters)
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{
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return get(function, Function, primitive)(parameters);
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}
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#define DO_SYMBOLS() DO_PROTOS() _DO(__proto__) _DO(__name__) _DO(value) _DO(lhs) _DO(rhs) _DO(scope)
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#define _DO(NAME) oop NAME##_symbol;
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DO_SYMBOLS()
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#undef _DO
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#define _DO(NAME) oop NAME##_proto;
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DO_PROTOS()
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#undef _DO
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oop newObject(oop proto)
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{
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oop map = makeMap();
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map_set(map, __proto___symbol, proto);
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return map;
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}
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void printObjectName(oop object)
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{
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assert(is(Map, object));
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oop name = map_get(object, __name___symbol);
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if (name != null) {
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println(name);
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return;
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}
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oop proto = map_get(object, __proto___symbol);
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if (proto != null) {
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printObjectName(proto);
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} else {
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fprintf(stderr, "\nThis map has no name\n");
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}
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}
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oop newMap()
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{
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oop map = newObject(map_proto);
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return map;
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}
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oop newDeclar(oop value)
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{
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oop declar = newObject(declar_proto);
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map_set(declar, value_symbol, value);
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return declar;
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}
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oop newAssign(oop lhs, oop rhs)
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{
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oop assign = newObject(assign_proto);
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map_set(assign, lhs_symbol, lhs);
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map_set(assign, rhs_symbol, rhs);
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return assign;
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}
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// take char *name or oop already interned?
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oop newSymbol(oop name)
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{
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oop symbol = newObject(symbol_proto);
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// what is the less confusing, name or value? maybe another word like identifier?
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map_set(symbol, value_symbol, name);
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return symbol;
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}
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oop newInteger(int value)
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{
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oop integer = newObject(integer_proto);
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map_set(integer, value_symbol, makeInteger(value));
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return integer;
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}
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oop newString(char *value)
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{
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oop string = newObject(string_proto);
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oop primitive_string = makeString(value);
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map_set(string, value_symbol, primitive_string);
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return string;
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}
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oop newBinary(oop proto, oop lhs, oop rhs)
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{
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oop obj = newObject(proto);
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map_set(obj, lhs_symbol, lhs);
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map_set(obj, rhs_symbol, rhs);
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return obj;
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}
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oop newMember(oop map, oop key)
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{
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oop obj = newObject(member_proto);
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// map_set(obj, )
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}
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// this always creates the key in "object"
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oop newVariable(oop object, oop key, oop value)
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{
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map_set(object, key, value);
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return value;
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}
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// this looks in object and everything in the __proto__ chain until it finds the key
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oop getVariable(oop object, oop key)
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{
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while (!map_hasKey(object, key)) {
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object = map_get(object, __proto___symbol);
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if (object == null) {
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return null;
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}
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}
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return map_get(object, key);
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}
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// this follows the __proto__ chain until it finds the key, if it fails it behaves like newMember
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oop setVariable(oop object, oop key, oop value)
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{
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oop firstObject = object;
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while (!map_hasKey(object, key)) {
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object = map_get(object, __proto___symbol);
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if (object == null) {
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fprintf(stderr, "\nUndefined, %s\n", get(key, Symbol, name));
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exit(1);
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}
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}
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return map_set(object, key, value);
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}
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#define YYSTYPE oop
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YYSTYPE yylval;
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%}
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start = - e:exp { yylval = e }
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exp = VAR l:IDENT { $$ = newDeclar(l) }
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| l:IDENT EQUAL p:exp { $$ = newAssign(l, p) }
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| l:postfix DOT i:IDENT EQUAL p:exp { $$ = map_set(l, i, p) }
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| l:postfix LBRAC i:exp RBRAC EQUAL p:exp { $$ = map_set(l, i, p) }
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| s:sum { $$ = s }
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sum = l:prod
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( PLUS+ r:prod { l = newBinary(add_proto, l, r) }
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| MINUS r:prod { l = newBinary(sub_proto, l, r) }
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)* { $$ = l }
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prod = l:prefix
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( MULTI r:prefix { l = newBinary(mul_proto, l, r) }
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| DIVIDE r:prefix { l = newBinary(div_proto, l, r) }
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| MODULO r:prefix { l = newBinary(mod_proto, l, r) }
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)* { $$ = l }
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prefix = MINUS n:prefix { set(n, Integer, value, -get(n, Integer, value)); $$ = n }
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| PLUS n:prefix { $$ = n }
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| n:postfix { $$ = n }
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postfix = i:value ( DOT s:IDENT p:parameterList { map_set(p, intern("this"), i); i = apply(map_get(i, s), p) }
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| DOT s:IDENT !EQUAL { i = map_get(i, s) }
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| LBRAC p:exp RBRAC !EQUAL { i = map_get(i, p) }
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| p:parameterList { i = apply(i, p) }
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) * { $$ = i }
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parameterList = LPAREN m:newMap
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( e:exp { map_append(m, e) }
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( COMMA e:exp { map_append(m, e) }
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) *
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) ?
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RPAREN { $$ = m }
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value = n:NUMBER { $$ = n }
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| s:string { $$ = s }
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| s:symbol { $$ = s }
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| m:map { $$ = m }
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| NULL { $$ = null }
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| i:IDENT { $$ = i }
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| LPAREN i:exp RPAREN { $$ = i }
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string = SQUOTE < (!SQUOTE .)* > SQUOTE { $$ = newString(yytext) }
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| DQUOTE < (!DQUOTE .)* > DQUOTE { $$ = newString(yytext) }
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symbol = HASH ( i:IDENT { $$ = newSymbol(i) }
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| i:string { $$ = newSymbol(intern(get(i, String, value))) }
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)
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map = LCB m:newMap
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( k:IDENT COLON v:exp { map_set(m, k, v) }
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( COMMA k:IDENT COLON v:exp { map_set(m, k, v) }
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) *
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) ?
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RCB { $$ = m }
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newMap = { $$ = newMap() }
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- = [ \t\n\r]*
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| "//" ( ![\n\r] . )*
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IDENT = < [a-zA-Z][a-zA-Z0-9_]* > - { $$ = intern(yytext) }
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NUMBER = < [0-9]+ > - { $$ = newInteger(atoi(yytext)) }
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VAR = 'var' -
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HASH = '#' -
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PLUS = '+' -
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MINUS = '-' -
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MULTI = '*' -
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DIVIDE = '/' -
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MODULO = '%' -
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EQUAL = '=' -
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NULL = 'null' -
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COLON = ':' -
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COMMA = ',' -
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DOT = '.' -
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LCB = '{' -
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RCB = '}' -
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LBRAC = '[' -
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RBRAC = ']' -
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LPAREN = '(' -
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RPAREN = ')' -
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DQUOTE = '"' -
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SQUOTE = "'" -
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%%
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;
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int getInteger(oop obj)
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{
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return get(obj, Integer, value);
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}
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oop eval(oop scope, oop ast)
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{
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switch(ast->type) {
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case Undefined:
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case Integer:
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case String:
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case Function:
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return ast;
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case Symbol:
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return map_get(scope, ast);
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}
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oop proto = map_get(ast, __proto___symbol);
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// proto_number is the enum version of the proto symbol
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proto_t proto_number = get(map_get(proto, __name___symbol), Symbol, prototype);
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switch (proto_number) {
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case t_map: {
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return ast;
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}
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case t_declar: {
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oop var = map_get(ast, value_symbol);
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return newVariable(scope, var, null);
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}
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case t_assign: {
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oop lhs = map_get(ast, lhs_symbol);
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oop rhs = eval(scope, map_get(ast, rhs_symbol));
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return setVariable(scope, lhs, rhs);
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}
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case t_symbol:
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case t_integer:
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case t_string: {
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return map_get(ast, value_symbol);
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}
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case t_add: {
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oop lhs = eval(scope, map_get(ast, lhs_symbol));
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oop rhs = eval(scope ,map_get(ast, rhs_symbol));
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return makeInteger(getInteger(lhs) + getInteger(rhs));
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}
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case t_sub: {
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oop lhs = eval(scope, map_get(ast, lhs_symbol));
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oop rhs = eval(scope ,map_get(ast, rhs_symbol));
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return makeInteger(getInteger(lhs) - getInteger(rhs));
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}
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case t_mul: {
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oop lhs = eval(scope, map_get(ast, lhs_symbol));
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oop rhs = eval(scope ,map_get(ast, rhs_symbol));
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return makeInteger(getInteger(lhs) * getInteger(rhs));
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}
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case t_div: {
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oop lhs = eval(scope, map_get(ast, lhs_symbol));
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oop rhs = eval(scope ,map_get(ast, rhs_symbol));
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return makeInteger(getInteger(lhs) / getInteger(rhs));
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}
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case t_mod: {
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oop lhs = eval(scope, map_get(ast, lhs_symbol));
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oop rhs = eval(scope ,map_get(ast, rhs_symbol));
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return makeInteger(getInteger(lhs) % getInteger(rhs));
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}
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default: {
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assert(0);
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break;
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}
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}
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return null;
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}
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int main(int argc, char **argv)
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{
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symbol_table = makeMap();
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globals = makeMap();
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#define _DO(NAME) NAME##_symbol=intern(#NAME);
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DO_SYMBOLS()
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#undef _DO
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#define _DO(NAME) set(NAME##_symbol, Symbol, prototype, t_##NAME);
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DO_PROTOS()
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#undef _DO
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// instanciate protos with empty Map and fill their name
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#define _DO(NAME) NAME##_proto=makeMap(); map_set(NAME##_proto, __name___symbol, NAME##_symbol);
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DO_PROTOS()
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#undef _DO
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/*
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oop myInteger = newInteger(32);
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println(myInteger);
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oop myAddition = newBinary(add_proto, myInteger, myInteger);
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println(myAddition);
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printObjectName(myAddition);
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printObjectName(myInteger);
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*/
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/*
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oop myFirst = newObject(null);
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oop myPizzaSymbol = makeSymbol("pizza");
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map_set(myFirst, myPizzaSymbol, makeInteger(3));
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oop mySecond = newObject(myFirst);
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oop myThird = newObject(mySecond);
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map_set(mySecond, myPizzaSymbol, makeInteger(4));
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println(myThird);
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println(getVariable(mySecond, myPizzaSymbol));
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*/
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while (yyparse()) {
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println(yylval);
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println(eval(globals, yylval));
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}
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return 0;
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(void)yyAccept;
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}
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