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pratt_parser.c
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pratt_parser.c
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/* * CEKF - VM supporting amb
* Copyright (C) 2022-2024 Bill Hails
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <ctype.h>
#include "pratt.h"
#include "pratt_parser.h"
#include "pratt_debug.h"
#include "pratt_functions.h"
#include "pratt_scanner.h"
#include "symbols.h"
#include "ast.h"
#include "bigint.h"
#include "utf8.h"
#include "print_generator.h"
#include "file_id.h"
#include "preamble.h"
#ifdef DEBUG_PRATT_PARSER
# include "debugging_on.h"
#else
# include "debugging_off.h"
#endif
// UTF8
// re-entrant
// stacked input stream
// modified during parse
// integrates with existing AST
// only one precedence
// operators can't be both infix and postfix
// left associative infix operators parse the rhs with prec + 1
// right associative infix operators parse the rhs with prec - 1
// pareslets for grouping know their own matching close brace
AstStringArray *include_paths = NULL;
static AstAltArgs *alt_args(PrattParser *);
static AstAltFunction *alt_function(PrattParser *);
static AstArg *astCharacterToFarg(ParserInfo, Character);
static AstArg *astExpressionToFarg(PrattParser *parser, AstExpression *expr);
static AstArg *astFunCallToFarg(PrattParser *parser, AstFunCall *funCall);
static AstArg *astLookupToFarg(PrattParser *parser, AstLookup *lookup);
static AstArg *astNumberToFarg(ParserInfo, MaybeBigInt *);
static AstArg *astStructureToFarg(PrattParser *parser, AstStruct *structure);
static AstArg *astSymbolToFarg(ParserInfo, HashSymbol *);
static AstArg *astTupleToFarg(PrattParser *parser, AstExpressions *tuple);
static AstArgList *astExpressionsToArgList(PrattParser *parser, AstExpressions *exprs);
static AstArgList *fargs(PrattParser *);
static AstCompositeFunction *composite_function(PrattParser *);
static AstCompositeFunction *functions(PrattParser *);
static AstDefinition *alias(PrattParser *);
static AstDefinition *assignment(PrattParser *);
static AstDefinition *definition(PrattParser *);
static AstDefinition *defmacro(PrattParser *);
static AstDefinition *defun(PrattParser *, bool, bool);
static AstDefinition *link(PrattParser *);
static AstDefinition *typedefinition(PrattParser *);
static AstDefinitions *definitions(PrattParser *, HashSymbol *);
static AstDefinitions *prattParseLink(PrattParser *, char *, PrattParser **);
static AstExpression *back(PrattRecord *, PrattParser *, AstExpression *, PrattToken *);
static AstExpression *call(PrattRecord *, PrattParser *, AstExpression *, PrattToken *);
static AstExpression *doPrefix(PrattRecord *, PrattParser *, AstExpression *, PrattToken *);
static AstExpression *errorExpression(ParserInfo);
static AstExpression *error(PrattRecord *, PrattParser *, AstExpression *, PrattToken *);
static AstExpression *exprAlias(PrattRecord *, PrattParser *, AstExpression *, PrattToken *);
static AstExpression *expression(PrattParser *);
static AstExpression *expressionPrecedence(PrattParser *, int);
static AstExpression *fn(PrattRecord *, PrattParser *, AstExpression *, PrattToken *);
static AstExpression *grouping(PrattRecord *, PrattParser *, AstExpression *, PrattToken *);
static AstExpression *iff(PrattRecord *, PrattParser *, AstExpression *, PrattToken *);
// static AstExpression *infixLeft(PrattRecord *, PrattParser *, AstExpression *, PrattToken *);
static AstExpression *infixRight(PrattRecord *, PrattParser *, AstExpression *, PrattToken *);
static AstExpression *list(PrattRecord *, PrattParser *, AstExpression *, PrattToken *);
static AstExpression *lookup(PrattRecord *, PrattParser *, AstExpression *, PrattToken *);
static AstExpression *macro(PrattRecord *, PrattParser *, AstExpression *, PrattToken *);
static AstExpression *makeAtom(PrattRecord *, PrattParser *, AstExpression *, PrattToken *);
static AstExpression *makeChar(PrattRecord *, PrattParser *, AstExpression *, PrattToken *);
static AstExpression *makeNumber(PrattRecord *, PrattParser *, AstExpression *, PrattToken *);
static AstExpression *makeString(PrattRecord *, PrattParser *, AstExpression *, PrattToken *);
static AstExpression *nestexpr(PrattRecord *, PrattParser *, AstExpression *, PrattToken *);
static AstExpression *passert(PrattRecord *, PrattParser *, AstExpression *, PrattToken *);
static AstExpression *print(PrattRecord *, PrattParser *, AstExpression *, PrattToken *);
static AstExpression *switchExp(PrattRecord *, PrattParser *, AstExpression *, PrattToken *);
static AstExpression *tuple(PrattRecord *, PrattParser *, AstExpression *, PrattToken *);
static AstExpression *unsafe(PrattRecord *, PrattParser *, AstExpression *, PrattToken *);
static AstExpression *userInfixLeft(PrattRecord *, PrattParser *, AstExpression *, PrattToken *);
static AstExpression *userInfixRight(PrattRecord *, PrattParser *, AstExpression *, PrattToken *);
static AstExpression *userPostfix(PrattRecord *, PrattParser *, AstExpression *, PrattToken *);
static AstExpression *userPrefix(PrattRecord *, PrattParser *, AstExpression *, PrattToken *);
static AstExpression *wildcard(PrattRecord *, PrattParser *, AstExpression *, PrattToken *);
static AstExpressions *expressions(PrattParser *);
static AstExpressions *statements(PrattParser *, HashSymbol *);
static AstFileIdArray *fileIdStack = NULL;
static AstFunCall *switchFC(PrattParser *parser);
static AstLookupOrSymbol *scoped_symbol(PrattParser *);
static AstNamespace *parseLink(PrattParser *, unsigned char *, HashSymbol *);
static AstNest *nest_body(PrattParser *, HashSymbol *);
static AstNest *nest(PrattParser *);
static AstNest *top(PrattParser *parser);
static AstTypeBody *type_body(PrattParser *);
static AstTypeClause *type_clause(PrattParser *);
static AstTypeConstructor *type_constructor(PrattParser *);
static AstTypeFunction *type_function(PrattParser *);
static AstTypeList *type_list(PrattParser *);
static AstTypeList *type_tuple(PrattParser *);
static AstTypeMap *type_map(PrattParser *);
static AstTypeSymbols *type_variables(PrattParser *);
static AstType *type_type(PrattParser *);
static HashSymbol *symbol(PrattParser *);
static HashSymbol *type_variable(PrattParser *);
static PrattRecord *fetchRecord(PrattParser *, HashSymbol *, bool);
static PrattTrie *makePrattTrie(PrattParser *, PrattTrie *);
static PrattUnicode *PrattUTF8ToUnicode(PrattUTF8 *);
static PrattUTF8 *rawString(PrattParser *);
static PrattUTF8 *str(PrattParser *);
static void storeNamespace(PrattParser *, AstNamespace *);
static void synchronize(PrattParser *parser);
#ifdef DEBUG_PRATT_PARSER
void disablePrattDebug(void) {
DEBUGGING_OFF();
}
#endif
static PrattParsers *parserStack = NULL;
static AstExpression *errorExpression(ParserInfo I) {
return newAstExpression_Symbol(I, TOK_ERROR());
}
static void addRecord(PrattTable *table, HashSymbol *tok,
PrattOp prefix, int prefixPrec,
PrattOp infix, int infixPrec,
PrattOp postfix, int postfixPrec) {
PrattRecord *record = newPrattRecord(tok, prefix, prefixPrec, infix, infixPrec, postfix, postfixPrec);
int save = PROTECT(record);
setPrattTable(table, record->symbol, record);
UNPROTECT(save);
}
static PrattParser *makePrattParser(void) {
PrattParser *parser = newPrattParser(NULL);
int save = PROTECT(parser);
PrattTable *table = parser->rules;
addRecord(table, TOK_SEMI(), NULL, 0, NULL, 0, NULL, 0);
addRecord(table, TOK_PREFIX(), NULL, 0, NULL, 0, NULL, 0);
addRecord(table, TOK_INFIX(), NULL, 0, NULL, 0, NULL, 0);
addRecord(table, TOK_POSTFIX(), NULL, 0, NULL, 0, NULL, 0);
addRecord(table, TOK_ATOM(), makeAtom, 0, NULL, 0, NULL, 0);
addRecord(table, TOK_CHAR(), makeChar, 0, NULL, 0, NULL, 0);
addRecord(table, TOK_NUMBER(), makeNumber, 0, NULL, 0, NULL, 0);
addRecord(table, TOK_STRING(), makeString, 0, NULL, 0, NULL, 0);
addRecord(table, TOK_TYPEDEF(), NULL, 0, NULL, 0, NULL, 0);
addRecord(table, TOK_PRINT(), print, 0, NULL, 0, NULL, 0);
addRecord(table, TOK_BACK(), back, 0, NULL, 0, NULL, 0);
addRecord(table, TOK_ASSERT(), passert, 0, NULL, 0, NULL, 0);
addRecord(table, TOK_UNSAFE(), unsafe, 0, NULL, 0, NULL, 0);
addRecord(table, TOK_FN(), fn, 0, NULL, 0, NULL, 0);
addRecord(table, TOK_MACRO(), macro, 0, NULL, 0, NULL, 0);
addRecord(table, TOK_LINK(), NULL, 0, NULL, 0, NULL, 0);
addRecord(table, TOK_SWITCH(), switchExp, 0, NULL, 0, NULL, 0);
addRecord(table, TOK_AS(), NULL, 0, NULL, 0, NULL, 0);
addRecord(table, TOK_ALIAS(), NULL, 0, NULL, 0, NULL, 0);
addRecord(table, TOK_KW_ERROR(), error, 0, NULL, 0, NULL, 0);
addRecord(table, TOK_NAMESPACE(), NULL, 0, NULL, 0, NULL, 0);
addRecord(table, TOK_LET(), NULL, 0, NULL, 0, NULL, 0);
addRecord(table, TOK_IN(), NULL, 0, NULL, 0, NULL, 0);
addRecord(table, TOK_TUPLE(), tuple, 0, NULL, 0, NULL, 0);
addRecord(table, TOK_CLOSE(), NULL, 0, NULL, 0, NULL, 0);
addRecord(table, TOK_IF(), iff, 0, NULL, 0, NULL, 0);
addRecord(table, TOK_ELSE(), NULL, 0, NULL, 0, NULL, 0);
addRecord(table, TOK_LSQUARE(), list, 0, NULL, 0, NULL, 0);
addRecord(table, TOK_RSQUARE(), NULL, 0, NULL, 0, NULL, 0);
addRecord(table, TOK_COMMA(), NULL, 0, NULL, 0, NULL, 0);
addRecord(table, TOK_LCURLY(), nestexpr, 0, NULL, 0, NULL, 0);
addRecord(table, TOK_RCURLY(), NULL, 0, NULL, 0, NULL, 0);
addRecord(table, TOK_PIPE(), NULL, 0, NULL, 0, NULL, 0);
addRecord(table, TOK_WILDCARD(), wildcard, 0, NULL, 0, NULL, 0);
addRecord(table, TOK_KW_NUMBER(), NULL, 0, NULL, 0, NULL, 0);
addRecord(table, TOK_KW_CHAR(), NULL, 0, NULL, 0, NULL, 0);
addRecord(table, TOK_EOF(), NULL, 0, NULL, 0, NULL, 0);
addRecord(table, TOK_ERROR(), NULL, 0, NULL, 0, NULL, 0);
addRecord(table, TOK_ARROW(), NULL, 0, infixRight, 10, NULL, 0);
addRecord(table, TOK_ASSIGN(), NULL, 0, exprAlias, 60, NULL, 0);
addRecord(table, TOK_COLON(), NULL, 0, NULL, 0, NULL, 0);
addRecord(table, TOK_HASH(), doPrefix, 120, NULL, 0, NULL, 0);
addRecord(table, TOK_OPEN(), grouping, 0, call, 130, NULL, 0);
addRecord(table, TOK_PERIOD(), NULL, 0, lookup, 140, NULL, 0);
parser->trie = makePrattTrie(parser, NULL);
UNPROTECT(save);
return parser;
}
static AstCompositeFunction *makeAstCompositeFunction(AstAltFunction *functions, AstCompositeFunction *rest) {
int save = PROTECT(NULL);
for (AstAltArgs *args = functions->altArgs; args != NULL; args = args->next) {
AstNest *copy = copyAstNest(functions->nest);
PROTECT(copy);
AstFunction *this = newAstFunction(CPI(args), args->argList, copy);
PROTECT(this);
rest = newAstCompositeFunction(CPI(args), this, rest);
PROTECT(rest);
}
UNPROTECT(save);
return rest;
}
static PrattUnicode *PrattUTF8ToUnicode(PrattUTF8 *utf8) {
PrattUnicode *uni = newPrattUnicode();
int save = PROTECT(uni);
unsigned char *entry = utf8->entries;
while (*entry != 0) {
Character c;
entry = utf8_to_unicode_char(&c, entry);
pushPrattUnicode(uni, c);
}
UNPROTECT(save);
return uni;
}
static AgnosticFileId *tryFile(char *prefix, char *file) {
char *buf = malloc(sizeof(char) * (strlen(prefix) + 1 + strlen(file) + 10));
if (buf == NULL) {
perror("out of memory");
exit(1);
}
sprintf(buf, "%s/%s", prefix, file);
AgnosticFileId *result = makeAgnosticFileId(buf);
if (result == NULL) free(buf);
return result;
}
static AgnosticFileId *searchForFile(char *initialPrefix, char *fileToFind) {
AgnosticFileId *result = NULL;
result = tryFile(initialPrefix, fileToFind);
if (result != NULL) return result;
if (include_paths != NULL) {
for (Index i = 0; i < include_paths->size; i++) {
result = tryFile(include_paths->entries[i], fileToFind);
if (result != NULL) return result;
}
}
return NULL;
}
static char *currentPrattFile(PrattParser *parser) {
char *no_file = "no_file";
if (parser == NULL) return no_file;
if (parser->lexer == NULL) return no_file;
if (parser->lexer->bufList == NULL) return no_file;
return parser->lexer->bufList->filename->name;
}
static AgnosticFileId *calculatePath(unsigned char *file, PrattParser *parser) {
if (*file == '/') {
return makeAgnosticFileId((char *)file);
}
char *currentFile = currentPrattFile(parser);
if (currentFile == NULL) {
return searchForFile(".", (char *)file);
}
currentFile = strdup(currentFile);
char *slash = strrchr(currentFile, '/');
if (slash == NULL) {
free(currentFile);
return searchForFile(".", (char *)file);
}
*slash = '\0';
AgnosticFileId *result = searchForFile(currentFile, (char *)file);
free(currentFile);
return result;
}
static bool fileIdInArray(AgnosticFileId *id, AstFileIdArray *array) {
for (Index i = 0; i < array->size; ++i) {
if (cmpAgnosticFileId(id, array->entries[i]) == CMP_EQ) {
return true;
}
}
return false;
}
static void synchronize(PrattParser *parser) {
if (!parser->panicMode) return;
parser->panicMode = false;
for (;;) {
if (check(parser, TOK_EOF())) return;
if (check(parser, TOK_SWITCH())) return;
if (check(parser, TOK_FN())) return;
if (check(parser, TOK_MACRO())) return;
if (check(parser, TOK_IF())) return;
if (check(parser, TOK_PRINT())) return;
if (check(parser, TOK_IN())) return;
if (check(parser, TOK_LINK())) return;
if (check(parser, TOK_SEMI())) {
next(parser);
return;
}
next(parser);
}
}
// only a few scenarios we actually need to support:
// 1. parse a standalone string, for tests ONLY
// 2. parse a file after parsing the prelude, the normal case
// 3. parse a string after parsing the prelude, allows a -e style command line option
// 4. parse a linked file (within the parser)
AstNest *prattParseStandaloneString(char *data, char *name) {
PrattParser *parser = makePrattParser();
int save = PROTECT(parser);
parser->lexer = makePrattLexerFromString(data, name);
AstNest *nest = top(parser);
UNPROTECT(save);
return nest;
}
// create a parser and a lexer
// parse the preamble with them
// create a child parser
// give it the lexer for the main data
// parse the main data
// collect namespaces etc.
static AstProg *prattParseThing(PrattLexer *thing) {
PrattParser *parser = makePrattParser();
int save = PROTECT(parser);
parser->lexer = makePrattLexerFromString((char *) preamble, "preamble");
parser->isPreamble = true;
AstNest *nest = top(parser);
if (parser->lexer->bufList != NULL) {
parserError(parser, "unconsumed tokens");
}
AstDefinitions *definitions = NULL;
if (nest) {
definitions = nest->definitions;
PROTECT(definitions);
}
PrattParser *child = newPrattParser(parser);
PROTECT(child);
child->lexer = thing;
nest = top(child);
if (child->lexer->bufList != NULL) {
parserError(child, "unconsumed tokens");
}
PROTECT(nest);
AstExpression *expression = newAstExpression_Nest(CPI(nest), nest);
PROTECT(expression);
AstExpressions *exprs = newAstExpressions(CPI(expression), expression, NULL);
PROTECT(exprs);
nest = newAstNest(CPI(expression), definitions, exprs);
AstProg *prog = astNestToProg(nest); // has direct access to namespaces
UNPROTECT(save);
return prog;
}
AstProg *prattParseFile(char *file) {
PrattLexer *lexer = makePrattLexerFromFilename(file);
int save = PROTECT(lexer);
AstProg *prog = prattParseThing(lexer);
UNPROTECT(save);
return prog;
}
AstProg *prattParseString(char *data, char *name) {
PrattLexer *lexer = makePrattLexerFromString(data, name);
int save = PROTECT(lexer);
AstProg *prog = prattParseThing(lexer);
UNPROTECT(save);
return prog;
}
static PrattParser *findPreambleParser(PrattParser *parser) {
#ifdef SAFETY_CHECKS
if (parser == NULL) {
cant_happen("cannot find preamble parser");
}
#endif
if (parser->isPreamble) {
return parser;
}
return findPreambleParser(parser->next);
}
static AstDefinitions *prattParseLink(PrattParser *parser, char *file, PrattParser **resultParser) {
parser = findPreambleParser(parser);
parser = newPrattParser(parser);
int save = PROTECT(parser);
parser->lexer = makePrattLexerFromFilename(file);
AstDefinitions *definitions = NULL;
AstNest *nest = top(parser);
if (nest) {
definitions = nest->definitions;
}
*resultParser = parser;
UNPROTECT(save);
return definitions;
}
static bool findNamespace(PrattParser *parser, HashSymbol *symbol, int *result) {
if (parser == NULL) return false;
if (getPrattIntTable(parser->namespaces, symbol, result)) return true;
return findNamespace(parser->next, symbol, result);
}
static void storeNamespace(PrattParser *parser, AstNamespace *ns) {
if (findNamespace(parser, ns->symbol, NULL)) {
parserError(parser, "redefinition of namespace %s", ns->symbol->name);
} else {
setPrattIntTable(parser->namespaces, ns->symbol, ns->reference);
}
}
int initFileIdStack() {
if (fileIdStack == NULL) {
fileIdStack = newAstFileIdArray();
}
return PROTECT(fileIdStack);
}
int initParserStack() {
if (parserStack == NULL) {
parserStack = newPrattParsers();
}
return PROTECT(parserStack);
}
// Careful. Somewhat accidentally this algorithm stores the namespaces
// in the order that they need to be processed.
// Specifically because a namespace is parsed before it is recorded,
// all of its imports are recorded ahead of it.
static AstNamespace *parseLink(PrattParser *parser, unsigned char *filename, HashSymbol *symbol) {
// check the file exists
AgnosticFileId *fileId = calculatePath(filename, parser);
int save = PROTECT(fileId);
if (fileId == NULL) {
parserError(parser, "cannot find file \"%s\"", filename);
AstNamespace *ns = newAstNamespace(BUFPI(parser->lexer->bufList), symbol, -1);
UNPROTECT(save);
return ns;
}
// see if we've already parsed it, if so return the existing namespace id
int found = lookupNamespace(fileId);
if (found != -1) {
AstNamespace *ns = newAstNamespace(BUFPI(parser->lexer->bufList), symbol, found);
UNPROTECT(save);
return ns;
}
// check for a recursive include
if (fileIdInArray(fileId, fileIdStack)) {
parserError(parser, "recursive include detected for %s", fileId->name);
AstNamespace *ns = newAstNamespace(BUFPI(parser->lexer->bufList), symbol, -1);
UNPROTECT(save);
return ns;
}
// protect against recursive include
pushAstFileIdArray(fileIdStack, fileId);
// parse the file
PrattParser *resultParser = NULL;
// careful, 2 pushes in a row could realloc the save stack on push 1
int save2 = PROTECT(fileId);
AstDefinitions *definitions = prattParseLink(parser, fileId->name, &resultParser);
REPLACE_PROTECT(save2, resultParser);
/*
if (definitions == NULL) {
AstNamespace *ns = newAstNamespace(BUFPI(parser->lexer->bufList), symbol, -1);
UNPROTECT(save);
return ns;
}
*/
PROTECT(definitions);
// save the new namespace and it's parser
AstNamespaceImpl *impl = newAstNamespaceImpl(BUFPI(parser->lexer->bufList), fileId, definitions);
PROTECT(impl);
found = pushAstNamespaceArray(namespaces, impl);
pushPrattParsers(parserStack, resultParser);
// un-protect against recursive include
popAstFileIdArray(fileIdStack);
// return the id of the namespace
AstNamespace *ns = newAstNamespace(BUFPI(parser->lexer->bufList), symbol, found);
UNPROTECT(save);
return ns;
}
static PrattTrie *makePrattTrie(PrattParser *parser, PrattTrie *C) {
HashSymbol *tok;
Index i = 0;
int save = PROTECT(parser); // not C because we need to have a slot for REPLACE_PROTECT
while ((tok = iteratePrattTable(parser->rules, &i, NULL)) != NULL) {
C = insertPrattTrie(C, tok);
REPLACE_PROTECT(save, C);
}
UNPROTECT(save);
return C;
}
static AstExpression *makePrattBinary(ParserInfo I, HashSymbol *op, AstExpression *lhs, AstExpression *rhs) {
AstExpressions *arguments = newAstExpressions(CPI(rhs), rhs, NULL);
int save = PROTECT(arguments);
arguments = newAstExpressions(CPI(lhs), lhs, arguments);
REPLACE_PROTECT(save, arguments);
AstExpression *symbol = newAstExpression_Symbol(I, op);
PROTECT(symbol);
AstFunCall *funCall = newAstFunCall(I, symbol, arguments);
REPLACE_PROTECT(save, funCall);
AstExpression *res = newAstExpression_FunCall(I, funCall);
UNPROTECT(save);
return res;
}
static AstExpression *makePrattUnary(ParserInfo I, HashSymbol *op, AstExpression *expr) {
AstExpressions *arguments = newAstExpressions(CPI(expr), expr, NULL);
int save = PROTECT(arguments);
AstExpression *symbol = newAstExpression_Symbol(I, op);
PROTECT(symbol);
AstFunCall *funCall = newAstFunCall(I, symbol, arguments);
REPLACE_PROTECT(save, funCall);
AstExpression *res = newAstExpression_FunCall(I, funCall);
UNPROTECT(save);
return res;
}
static PrattParser *makeChildParser(PrattParser *parent) {
PrattParser *child = newPrattParser(parent);
child->lexer = parent->lexer;
return child;
}
static AstNest *top(PrattParser *parser) {
ENTER(top);
DEBUG("%s", parser->lexer->bufList->buffer->data);
AstNest *body = nest_body(parser, TOK_EOF());
int save = PROTECT(body);
consume(parser, TOK_EOF());
LEAVE(top);
UNPROTECT(save);
return body;
}
static AstNest *nest_body(PrattParser *parser, HashSymbol *terminal) {
ENTER(nest_body);
AstNest *res = NULL;
int save = PROTECT(parser);
if (match(parser, TOK_LET())) {
AstDefinitions *defs = definitions(parser, TOK_IN());
save = PROTECT(defs);
consume(parser, TOK_IN());
AstExpressions *stats = statements(parser, terminal);
PROTECT(stats);
res = newAstNest(CPI(defs), defs, stats);
} else if (match(parser, TOK_NAMESPACE())) {
AstDefinitions *defs = definitions(parser, terminal);
save = PROTECT(defs);
res = newAstNest(CPI(defs), defs, NULL);
} else {
AstExpressions *stats = statements(parser, terminal);
save = PROTECT(stats);
res = newAstNest(CPI(stats), NULL, stats);
}
LEAVE(nest_body);
UNPROTECT(save);
return res;
}
static AstExpressions *statements(PrattParser *parser, HashSymbol *terminal) {
ENTER(statements);
AstExpression *expr = expression(parser);
int save = PROTECT(expr);
AstExpressions *this = NULL;
if (check(parser, TOK_SEMI())) {
next(parser);
validateLastAlloc();
if (check(parser, terminal)) {
this = newAstExpressions(CPI(expr), expr, NULL);
} else {
AstExpressions *rest = statements(parser, terminal);
PROTECT(rest);
this = newAstExpressions(CPI(expr), expr, rest);
}
} else {
this = newAstExpressions(CPI(expr), expr, NULL);
}
LEAVE(statements);
UNPROTECT(save);
return this;
}
static AstExpression *expression(PrattParser *parser) {
AstExpression *res = expressionPrecedence(parser, 0);
int save = PROTECT(res);
synchronize(parser);
UNPROTECT(save);
return res;
}
static AstDefinitions *definitions(PrattParser *parser, HashSymbol *terminal) {
ENTER(definitions);
if (check(parser, terminal)) {
LEAVE(definitions);
return NULL;
}
if (check(parser, TOK_EOF())) {
LEAVE(definitions);
return NULL;
}
AstDefinition *def = definition(parser);
int save = PROTECT(def);
AstDefinitions *next = definitions(parser, terminal);
PROTECT(next);
AstDefinitions *this = newAstDefinitions(CPI(def), def, next);
LEAVE(definitions);
UNPROTECT(save);
return this;
}
static void validateOperator(PrattParser *parser, PrattUTF8 *operator) {
if (strlen((char *) operator->entries) == 0) {
parserError(parser, "operator cannot be empty string");
} else if (isdigit(operator->entries[0])) {
parserError(parser, "operator cannot start with a numeric digit");
} else if (utf8_isopen(operator->entries)) {
parserError(parser, "operator cannot start with an opening bracket");
} else if (utf8_isclose(operator->entries)) {
parserError(parser, "operator cannot start with a closing bracket");
} else {
for (Index i = 0; i < operator->size; i++) {
if (isspace(operator->entries[i])) {
parserError(parser, "operator cannot contain whitespace");
break;
}
}
}
}
static void addOperator(PrattParser *parser,
PrattFixity fixity,
bool left,
int precedence,
PrattUTF8 *operator,
AstExpression *impl) {
HashSymbol *op = newSymbol((char *) operator->entries);
PrattRecord *record = fetchRecord(parser, op, false);
int save = PROTECT(record);
if (record) {
record = copyPrattRecord(record);
PROTECT(record);
switch (fixity) {
case PRATTFIXITY_TYPE_PREFIX: {
if (record->prefixOp) {
parserErrorAt(CPI(impl),
parser,
"attempt to redefine prefix operator \"%s\"",
operator->entries);
}
record->prefixOp = userPrefix;
record->prefixPrec = precedence;
record->prefixImpl = impl;
}
break;
case PRATTFIXITY_TYPE_INFIX: {
if (record->infixOp) {
parserErrorAt(CPI(impl),
parser,
"attempt to redefine infix operator \"%s\"",
operator->entries);
} else if (record->postfixOp) {
parserErrorAt(CPI(impl),
parser,
"attempt to define existing postfix operator \"%s\" as infix",
operator->entries);
}
record->infixOp = left ? userInfixLeft : userInfixRight;
record->infixPrec = precedence;
record->infixImpl = impl;
}
break;
case PRATTFIXITY_TYPE_POSTFIX: {
if (record->postfixOp) {
parserErrorAt(CPI(impl),
parser,
"attempt to redefine postfix operator \"%s\"",
operator->entries);
} else if (record->infixOp) {
parserErrorAt(CPI(impl),
parser,
"attempt to define existing infix operator \"%s\" as postfix",
operator->entries);
}
record->postfixOp = userPostfix;
record->postfixPrec = precedence;
record->postfixImpl = impl;
}
break;
}
} else {
switch (fixity) {
case PRATTFIXITY_TYPE_PREFIX: {
record = newPrattRecord(op, userPrefix, precedence, NULL, 0, NULL, 0);
PROTECT(record);
record->prefixImpl = impl;
}
break;
case PRATTFIXITY_TYPE_INFIX: {
record = newPrattRecord(op, NULL, 0, left ? userInfixLeft : userInfixRight, precedence, NULL, 0);
PROTECT(record);
record->infixImpl = impl;
}
break;
case PRATTFIXITY_TYPE_POSTFIX: {
record = newPrattRecord(op, NULL, 0, NULL, 0, userPostfix, precedence);
PROTECT(record);
record->postfixImpl = impl;
}
break;
}
parser->trie = insertPrattTrie(parser->trie, op);
}
if (record) {
// hoist - might have come from parent env
setPrattTable(parser->rules, op, record);
}
UNPROTECT(save);
}
static void copyPrattTable(PrattTable *to, PrattTable *from) {
Index i = 0;
HashSymbol *symbol = NULL;
PrattRecord *record = NULL;
while ((symbol = iteratePrattTable(from, &i, &record)) != NULL) {
setPrattTable(to, symbol, record);
}
}
static void copyPrattIntTable(PrattIntTable *to, PrattIntTable *from) {
Index i = 0;
HashSymbol *symbol = NULL;
int record = 0;
while ((symbol = iteratePrattIntTable(from, &i, &record)) != NULL) {
setPrattIntTable(to, symbol, record);
}
}
static PrattParser *meldParsers(PrattParser *to, PrattParser *from) __attribute__((unused));
static PrattParser *meldParsers(PrattParser *to, PrattParser *from) {
if (from->trie) {
PrattParser *result = newPrattParser(to->next);
int save = PROTECT(result);
copyPrattTable(result->rules, to->rules);
copyPrattIntTable(result->namespaces, to->namespaces);
result->lexer = to->lexer;
result->trie = to->trie;
Index i = 0;
HashSymbol *op = NULL;
PrattRecord *record = NULL;
while ((op = iteratePrattTable(from->rules, &i, &record)) != NULL) {
PrattRecord *target = NULL;
getPrattTable(to->rules, op, &target);
if (target == NULL) {
target = copyPrattRecord(record);
PROTECT(target);
setPrattTable(result->rules, op, target);
result->trie = insertPrattTrie(result->trie, op);
} else {
if (record->prefixImpl) {
if (target->prefixImpl) {
parserError(to, "import redefines prefix operator %s", op->name);
} else {
target->prefixImpl = record->prefixImpl;
target->prefixPrec = record->prefixPrec;
target->prefixOp = record->prefixOp;
}
}
if (record->infixImpl) {
if (target->infixImpl) {
parserError(to, "import redefines infix operator %s", op->name);
} else if (target->postfixImpl) {
parserError(to, "import defines infix operator %s"
" over existing postfix operator", op->name);
} else {
target->infixImpl = record->infixImpl;
target->infixPrec = record->infixPrec;
target->infixOp = record->infixOp;
}
}
if (record->postfixImpl) {
if (target->postfixImpl) {
parserError(to, "import redefines postfix operator %s", op->name);
} else if (target->postfixImpl) {
parserError(to, "import defines postfix operator %s"
" over existing infix operator", op->name);
} else {
target->postfixImpl = record->postfixImpl;
target->postfixPrec = record->postfixPrec;
target->postfixOp = record->postfixOp;
}
}
}
}
UNPROTECT(save);
return result;
} else {
return to;
}
}
static AstDefinition *postfix(PrattParser *parser) {
ENTER(postfix);
PrattToken *tok = peek(parser);
int save = PROTECT(tok);
consume(parser, TOK_POSTFIX());
if (check(parser, TOK_NUMBER())) {
PrattToken *prec = next(parser);
PROTECT(prec);
#ifdef SAFETY_CHECKS
if (prec->value->type != PRATTVALUE_TYPE_NUMBER) {
cant_happen("unexpected %s", prattValueTypeName(prec->value->type));
}
#endif
MaybeBigInt *bi = prec->value->val.number;
if (bi->type == BI_SMALL && !bi->imag) {
int precedence = bi->small;
PrattUTF8 *str = rawString(parser);
PROTECT(str);
validateOperator(parser, str);
AstExpression *impl = expression(parser);
PROTECT(impl);
consume(parser, TOK_SEMI());
addOperator(parser, PRATTFIXITY_TYPE_POSTFIX, false, precedence, str, impl);
} else {
parserErrorAt(TOKPI(prec), parser, "expected small integer");
}
}
LEAVE(postfix);
UNPROTECT(save);
return newAstDefinition_Blank(TOKPI(tok));
}
static AstDefinition *prefix(PrattParser *parser) {
ENTER(prefix);
PrattToken *tok = peek(parser);
int save = PROTECT(tok);
consume(parser, TOK_PREFIX());
if (check(parser, TOK_NUMBER())) {
PrattToken *prec = next(parser);
PROTECT(prec);
#ifdef SAFETY_CHECKS
if (prec->value->type != PRATTVALUE_TYPE_NUMBER) {
cant_happen("unexpected %s", prattValueTypeName(prec->value->type));
}
#endif
MaybeBigInt *bi = prec->value->val.number;
if (bi->type == BI_SMALL && !bi->imag) {
int precedence = bi->small;
PrattUTF8 *str = rawString(parser);
PROTECT(str);
validateOperator(parser, str);
AstExpression *impl = expression(parser);
PROTECT(impl);
consume(parser, TOK_SEMI());
addOperator(parser, PRATTFIXITY_TYPE_PREFIX, false, precedence, str, impl);
} else {
parserErrorAt(TOKPI(prec), parser, "expected small integer");
}
}
LEAVE(prefix);
UNPROTECT(save);
return newAstDefinition_Blank(TOKPI(tok));
}
static AstDefinition *infix(PrattParser *parser) {
ENTER(infix);
PrattToken *tok = peek(parser);
int save = PROTECT(tok);
consume(parser, TOK_INFIX());
if (check(parser, TOK_ATOM())) {
PrattToken *atom = next(parser);
PROTECT(atom);
#ifdef SAFETY_CHECKS
if (atom->value->type != PRATTVALUE_TYPE_ATOM) {
cant_happen("unexpected %s", prattValueTypeName(atom->value->type));
}
#endif
bool leftassoc = true;
if (atom->value->val.atom == TOK_LEFT()) {
leftassoc = true;
} else if (atom->value->val.atom == TOK_RIGHT()) {
leftassoc = false;
} else {
parserErrorAt(TOKPI(atom), parser, "expected \"left\" or \"right\" after infix keyword");
}
if (check(parser, TOK_NUMBER())) {
PrattToken *prec = next(parser);
PROTECT(prec);
#ifdef SAFETY_CHECKS
if (prec->value->type != PRATTVALUE_TYPE_NUMBER) {
cant_happen("unexpected %s", prattValueTypeName(prec->value->type));
}
#endif
MaybeBigInt *bi = prec->value->val.number;
if (bi->type == BI_SMALL && !bi->imag) {
int precedence = bi->small;
PrattUTF8 *str = rawString(parser);
PROTECT(str);
validateOperator(parser, str);
AstExpression *impl = expression(parser);
PROTECT(impl);
consume(parser, TOK_SEMI());
addOperator(parser, PRATTFIXITY_TYPE_INFIX, leftassoc, precedence, str, impl);
} else {
parserErrorAt(TOKPI(prec), parser, "expected small integer");
}
}
}
LEAVE(infix);
UNPROTECT(save);
return newAstDefinition_Blank(TOKPI(tok));
}
static AstDefinition *definition(PrattParser *parser) {
ENTER(definition);
AstDefinition *res = NULL;
if (check(parser, TOK_ATOM())) {
res = assignment(parser);
} else if (check(parser, TOK_TYPEDEF())) {
res = typedefinition(parser);
} else if (check(parser, TOK_UNSAFE())) {
next(parser);
validateLastAlloc();
consume(parser, TOK_FN());
res = defun(parser, true, false);
} else if (check(parser, TOK_FN())) {
next(parser);
validateLastAlloc();
res = defun(parser, false, false);
} else if (check(parser, TOK_PRINT())) {
next(parser);
validateLastAlloc();
res = defun(parser, false, true);
} else if (check(parser, TOK_MACRO())) {
next(parser);
res = defmacro(parser);
} else if (check(parser, TOK_LINK())) {
res = link(parser);
} else if (check(parser, TOK_ALIAS())) {
res = alias(parser);
} else if (check(parser, TOK_PREFIX())) {
res = prefix(parser);
} else if (check(parser, TOK_INFIX())) {
res = infix(parser);
} else if (check(parser, TOK_POSTFIX())) {
res = postfix(parser);
} else {
PrattToken *tok = next(parser);
validateLastAlloc();
parserError(parser, "expecting definition");
res = newAstDefinition_Blank(TOKPI(tok));
}
int save = PROTECT(res);
synchronize(parser);
LEAVE(definition);
UNPROTECT(save);
return res;
}
static AstDefinition *alias(PrattParser *parser) {
ENTER(alias);
consume(parser, TOK_ALIAS());
HashSymbol *s = symbol(parser);
consume(parser, TOK_ASSIGN());
AstType *t = type_type(parser);
int save = PROTECT(t);
consume(parser, TOK_SEMI());
AstAlias *a = newAstAlias(CPI(t), s, t);
PROTECT(a);
AstDefinition *d = newAstDefinition_Alias(CPI(a), a);
LEAVE(alias);