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Merge remote-tracking branch 'upstream/master' into d6/binary

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~d6 2024-05-04 22:37:35 -04:00
parent 52ae7406b5 0f3c1b4fb8
commit e073d7c884
8 changed files with 219 additions and 522 deletions
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1
README.md
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@ -16,6 +16,7 @@ cc src/modal.c -o bin/modal
bin/modal examples/hello.modal bin/modal examples/hello.modal
-v Print version -v Print version
-q Quiet mode, no step printing -q Quiet mode, no step printing
-p Print summary with refs count
-n Infinite mode, no rewrites limit -n Infinite mode, no rewrites limit
``` ```

6
examples/fib.modal Normal file
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@ -0,0 +1,6 @@
<> (`?: ?0 ?1) ((Int ?:))
<> (fib ?n) (?n (Int 0) (Int 1) Fib)
<> ((Int 0) (Int ?0) (Int ?1) Fib) ?0
<> ((Int ?x) (Int ?y) (Int ?z) Fib) (`- ?x 1 (Int ?z) `+ ?z ?y Fib)
fib (Int 11)

9
examples/fizzbuzz-alu.modal Normal file
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@ -0,0 +1,9 @@
<> (fizzbuzz ?x ?x) (done.)
<> (?x Int 0 Int 0 test) (?(?: ?:) (Fizz Buzz\n))
<> (?x Int 0 Int ?z test) (?(?: ?:) Fizz\n)
<> (?x Int ?y Int 0 test) (?(?: ?:) Buzz\n)
<> (?x Int ?y Int ?z test) (?(?: ?:) (?x \n))
<> (?x eval) (?x ?((?0 ?1 ?:) (Int ?:)) ?x 3 % ?((?0 ?1 ?:) (Int ?:)) ?x 5 % test)
<> (fizzbuzz ?x ?y) (?x eval fizzbuzz ?((?0 ?1 ?:) ?:) ?x 1 + ?y)
fizzbuzz 1 30

2
examples/postcard.modal
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@ -1,4 +1,3 @@
<> (what is ?x) (is ?x a (programming language)) <> (what is ?x) (is ?x a (programming language))
<> (is ?x a ?y) (or, is ?x (a virtual machine)) <> (is ?x a ?y) (or, is ?x (a virtual machine))
<> (or, is ?x ?y) (?x is ?y <> ?y (a meta-language)) <> (or, is ?x ?y) (?x is ?y <> ?y (a meta-language))
@ -6,4 +5,3 @@
<> (?x is ?x) (?(?: ?:) ?x) <> (?x is ?x) (?(?: ?:) ?x)
what is modal what is modal

47
examples/tests.modal
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@ -8,8 +8,8 @@
?(?-) (Formatter) ?(?-) (Formatter)
?((?x ?y) one) aaa(bbb) = one (formatter 1) test ?((?x ?y) two) aaa(bbb) = two (formatter 1) test
?((?x ?y) one) (bbb)aaa = one (formatter 2) test ?((?x ?y) two) (bbb)aaa = two (formatter 2) test
(a b c ) = (a b c) (formatter 3) test (a b c ) = (a b c) (formatter 3) test
( a b c) = (a b c) (formatter 4) test ( a b c) = (a b c) (formatter 4) test
( a b c ) = (a b c) (formatter 5) test ( a b c ) = (a b c) (formatter 5) test
@ -86,6 +86,19 @@ abc ?(?x) def = abc (lambda 2) test
reverse (modal) = ladom (reverse 1) test reverse (modal) = ladom (reverse 1) test
?(?-) (Incomplete definitions)
<> <>
<> () ()
<> (incomplete-basic)
<> (incomplete-reg ?x)
<> (waste-rule) *
(incomplete-basic) = () (incomplete 1) test
(incomplete-reg abcdef) = () (incomplete 2) test
(?(?x) incomplete-lambda) = () (incomplete 3) test
(?() abc) = (abc) (incomplete 4) test
?(?-) (Inline rules) ?(?-) (Inline rules)
<> ((?x -> ?y)) (<> ?x ?y) <> ((?x -> ?y)) (<> ?x ?y)
@ -93,6 +106,36 @@ reverse (modal) = ladom (reverse 1) test
nap tap (inline 1) test nap tap (inline 1) test
?(?-) (Undefinition)
<> (undefine-me) (abc)
<> (undefine-me) (def)
<> (undefine-me) (ghi)
>< (undefine-me)
(undefine-me) = (def) (undefinition 1) test
>< (undefine-me)
(undefine-me) = (ghi) (undefinition 2) test
>< (undefine-unknown)
?(* (>< (undefine-me))) *
(undefine-me) = (undefine-me) (undefinition 3) test
?(?-) (Arithmetic)
?((?: ?0 ?1 ?2) ?:) + 1 2 3 = 6 (Arithmetic 1) test
?((?0 ?: ?1) ?:) 16 - 8 = 8 (Arithmetic 2) test
?((?0 ?1 ?:) ?:) 12 10 * = 120 (Arithmetic 3) test
<> (?0 ?1 `?:) (?:)
(12 45 `+ -2 `+) = (55) (Arithmetic 4) test
?(?-) (Late Test Primitives) ?(?-) (Late Test Primitives)
<> (?x = ?y ?n test) (?(?: ?:) (#fail ?n found: ?x expect: ?y\n)) <> (?x = ?y ?n test) (?(?: ?:) (#fail ?n found: ?x expect: ?y\n))

2
makefile
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@ -1,5 +1,5 @@
RELEASE_flags=-DNDEBUG -O2 -g0 -s RELEASE_flags=-DNDEBUG -O2 -g0 -s
DEBUG_flags=-std=c89 -D_POSIX_C_SOURCE=199309L -DDEBUG -Wall -Wno-unknown-pragmas -Wpedantic -Wshadow -Wextra -Werror=implicit-int -Werror=incompatible-pointer-types -Werror=int-conversion -Wvla -g -Og -fsanitize=address -fsanitize=undefined DEBUG_flags=-std=c99 -D_POSIX_C_SOURCE=199309L -DDEBUG -Wall -Wno-unknown-pragmas -Wpedantic -Wshadow -Wextra -Werror=implicit-int -Werror=incompatible-pointer-types -Werror=int-conversion -Wvla -g -Og -fsanitize=address -fsanitize=undefined
.PHONY: all debug dest run debug test install uninstall format clean archive .PHONY: all debug dest run debug test install uninstall format clean archive

419
old/modal.py
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@ -1,419 +0,0 @@
"""
*------------------------------------------------------------*
|modal.py : An Implementation of Modal in Python |
| |
|This is an implementation of Modal, a programming language |
|based on term rewriting. This particular implementation |
|is based on the idea of cyclic delimited string rewriting |
|using a central queue and a dictionary of variable bindings.|
| |
|© 2019-2024 wryl, Paradigital |
*------------------------------------------------------------*
"""
# `sys` for I/O and arguments.
# `time` for measuring the runtime of the interpreter.
import sys, time
# A decorator intended for measuring the runtime of a given function.
def measure(function):
def measurement(*arguments):
start = time.time()
result = function(*arguments)
end = time.time()
milliseconds = (end - start) * 1000.0
print("\nTook {:.3f}ms".format(milliseconds))
return result
return measurement
# Enqueue an item by appending it to the queue.
def enqueue(queue, item):
return queue + item
# Dequeue an item by slicing the queue. The last item is the head.
def dequeue(queue, length=1):
if length > len(queue):
return queue
return queue[length:]
# Get the item(s) at the head of the queue.
def peek(queue, length=1):
if length > len(queue):
return None
if length == 1:
return queue[0]
return queue[:length]
# Roll/cycle the queue by a certain amount by slicing.
# This dequeues and enqueues a number of items, "cycling" the queue.
def roll(queue, length=1):
if length > len(queue):
return queue
return queue[length:] + queue[:length]
# Seek to a certain position in the queue by repeatedly rolling it.
def seek(queue, pattern):
if pattern not in queue:
return queue
while peek(queue, len(pattern)) != pattern:
queue = roll(queue)
return queue
# Extract a delimited fragment (subtree) from the queue.
def extract(queue):
results = []
depth = 0
for element in queue:
if element[0] == "SRT":
return []
if element[0] == "INC":
depth = depth + 1
if element[0] == "DEC":
if depth == 0:
return results
depth = depth - 1
results.append(element)
if depth == 0:
return results
return results
# Generate a list of variable bindings from the current queue and a pattern.
def match(pattern, queue, context=None):
if context == None:
context = {}
if peek(queue) == None:
return context
for element in pattern:
if element[0] == "VAR":
variable = element[1]
value = extract(queue)
if variable in context:
if context[variable] != value:
return None
queue = dequeue(queue, len(context[variable]))
else:
if len(value) == 0:
return None
context[variable] = value
queue = dequeue(queue, len(context[variable]))
elif element != peek(queue):
return None
else:
queue = dequeue(queue)
return context
# Fill in a pattern with variables in it using a list of variable bindings.
def construct(pattern, context):
results = []
for element in pattern:
if element[0] == "VAR":
if element[1] in context:
for element in context[element[1]]:
results.append(element)
else:
results.append(element)
else:
results.append(element)
return results
# Apply a pattern/replacement rule to the queue.
def apply(queue, rules, pattern, replacement):
context = match(pattern, queue)
if context == None:
return (False, roll(queue))
pattern = construct(pattern, context)
if not pattern:
return (False, roll(queue))
replacement = construct(replacement, context)
return (True, enqueue(dequeue(queue, len(pattern)), replacement))
def define(queue, rules, pattern):
context = match(pattern, queue)
left = context["left"]
right = context["right"]
if right and left:
if len(left) > 1:
left = left[1:][:-1]
if len(right) > 1:
right = right[1:][:-1]
rules.append((left, apply, [right]))
return (True, dequeue(queue, len(construct(pattern, context))))
return (False, roll(queue))
def undefine(queue, rules, pattern):
context = match(pattern, queue)
left = context["left"]
if left:
if len(left) > 1:
left = left[1:][:-1]
for rule, index in zip(rules, range(0, len(rules))):
candidate , _, _ = rule
if candidate == left:
del rules[index]
return (True, dequeue(queue, len(construct(pattern, context))))
return (False, roll(queue))
def add(queue, rules, pattern):
context = match(pattern, queue)
left = context["left"]
right = context["right"]
if left and right:
if left[0][0] == "NUM" and right[0][0] == "NUM":
queue = dequeue(queue, len(construct(pattern, context)))
queue = enqueue(queue, parse(str(left[0][1] + right[0][1])))
return (True, queue)
return (False, roll(queue))
def subtract(queue, rules, pattern):
context = match(pattern, queue)
left = context["left"]
right = context["right"]
if left and right:
if left[0][0] == "NUM" and right[0][0] == "NUM":
queue = dequeue(queue, len(construct(pattern, context)))
queue = enqueue(queue, parse(str(left[0][1] - right[0][1])))
return (True, queue)
return (False, roll(queue))
def multiply(queue, rules, pattern):
context = match(pattern, queue)
left = context["left"]
right = context["right"]
if left and right:
if left[0][0] == "NUM" and right[0][0] == "NUM":
queue = dequeue(queue, len(construct(pattern, context)))
queue = enqueue(queue, parse(str(left[0][1] * right[0][1])))
return (True, queue)
return (False, roll(queue))
def divide(queue, rules, pattern):
context = match(pattern, queue)
left = context["left"]
right = context["right"]
if left and right:
if left[0][0] == "NUM" and right[0][0] == "NUM":
queue = dequeue(queue, len(construct(pattern, context)))
queue = enqueue(queue, parse(str(left[0][1] // right[0][1])))
return (True, queue)
return (False, roll(queue))
def modulo(queue, rules, pattern):
context = match(pattern, queue)
left = context["left"]
right = context["right"]
if left and right:
if left[0][0] == "NUM" and right[0][0] == "NUM":
queue = dequeue(queue, len(construct(pattern, context)))
queue = enqueue(queue, parse(str(left[0][1] % right[0][1])))
return (True, queue)
return (False, roll(queue))
def display(queue, rules, pattern):
context = match(pattern, queue)
left = context["left"]
if left:
if left[0][0] == "LIT" or left[0][0] == "NUM":
if left[0][1] == "space":
print(' ', end="")
elif left[0][1] == "newline":
print('\n', end="")
elif left[0][1] == "tab":
print('\t', end="")
else:
print(left[0][1], end="")
return (True, dequeue(queue, len(construct(pattern, context))))
return (False, roll(queue))
def applicable(rules, queue):
results = []
for pattern, operation, parameters in rules:
if match(pattern, queue) != None:
results.append((pattern, operation, parameters))
return results
def pick(list):
if len(list) == 0:
return None
return list[0]
def reconstruct(pattern):
for element in pattern:
if element[0] == "INC":
yield '('
elif element[0] == "DEC":
yield ')'
elif element[0] == "NUM":
yield str(element[1])
elif element[0] == "LIT":
yield element[1]
elif element[0] == "VAR":
yield '?' + element[1]
yield ' '
def number(string):
try:
result = int(string)
return True
except:
return False
def literal(string, index=0):
token = ""
while index != len(string):
character = string[index]
if character in ['(', ')', '{', '}', '[', ']', '?', ' ', '\t', '\n', '\r']:
break
else:
token = token + string[index]
index = index + 1
return (token, index)
def parse(string, index=0):
results = []
while index != len(string):
character = string[index]
if character in ['(', ')', '{', '}', '[', ']', '?', ' ', '\t', '\n', '\r']:
index = index + 1
if character in ['(', '{', '[']:
results.append(["INC"])
elif character in [')', '}', ']']:
results.append(["DEC"])
elif character not in [' ', '\t', '\n', '\r']:
token, index = literal(string, index)
if character == '?':
results.append(["VAR", token])
elif number(token):
results.append(["NUM", int(token)])
else:
results.append(["LIT", token])
return results
@measure
def run(rules, queue, limit=pow(2, 32)):
steps = 0
failures = 0
queue = [["SRT"]] + queue
while failures != len(queue) and steps != limit:
rule = pick(applicable(rules, queue))
if rule == None:
queue = roll(queue)
failures = failures + 1
else:
pattern, operation, parameters = rule
result, queue = operation(queue, rules, pattern, *parameters)
if result == True:
failures = 0
print("<>: ", inspect(seek(queue, ["SRT"])))
#print("<>: ", inspect(queue))
#input()
steps = steps + 1
if steps == limit:
print("Execution limit reached.")
return queue
def read(file):
try:
with open(file) as file:
content = file.read()
return content
except EnvironmentError:
return None
def inspect(pattern):
return "".join(reconstruct(pattern))
def usage(name):
print(name + ':', "a programming language based on rewriting.")
print("Usage:")
print((' ' * 4) + name, "<file>")
def prompt(prompt):
try:
return input(prompt)
except:
return None
def help():
prefix = ' ' * 4
print("Commands:")
print(prefix + "rules : Display the current ruleset.")
print(prefix + "clear : Clear the current ruleset.")
print(prefix + "help : This message.")
print(prefix + "quit : Quit.")
def main():
defaults = [
(parse("define ?left ?right"), define, []),
(parse("undefine ?left"), undefine, []),
(parse("add (?left) (?right)"), add, []),
(parse("add (?left) ?right"), add, []),
(parse("add ?left (?right)"), add, []),
(parse("add ?left ?right"), add, []),
(parse("subtract (?left) (?right)"), subtract, []),
(parse("subtract (?left) ?right"), subtract, []),
(parse("subtract ?left (?right)"), subtract, []),
(parse("subtract ?left ?right"), subtract, []),
(parse("multiply (?left) (?right)"), multiply, []),
(parse("multiply (?left) ?right"), multiply, []),
(parse("multiply ?left (?right)"), multiply, []),
(parse("multiply ?left ?right"), multiply, []),
(parse("divide (?left) (?right)"), divide, []),
(parse("divide (?left) ?right"), divide, []),
(parse("divide ?left (?right)"), divide, []),
(parse("divide ?left ?right"), divide, []),
(parse("modulo (?left) (?right)"), modulo, []),
(parse("modulo (?left) ?right"), modulo, []),
(parse("modulo ?left (?right)"), modulo, []),
(parse("modulo ?left ?right"), modulo, []),
(parse("(?left) + (?right)"), add, []),
(parse("(?left) + ?right"), add, []),
(parse("?left + (?right)"), add, []),
(parse("?left + ?right"), add, []),
(parse("(?left) - (?right)"), subtract, []),
(parse("(?left) - ?right"), subtract, []),
(parse("?left - (?right)"), subtract, []),
(parse("?left - ?right"), subtract, []),
(parse("(?left) * (?right)"), multiply, []),
(parse("(?left) * ?right"), multiply, []),
(parse("?left * (?right)"), multiply, []),
(parse("?left * ?right"), multiply, []),
(parse("?left / ?right"), divide, []),
(parse("?left % ?right"), modulo, []),
(parse("display ?left"), display, []),
]
rules = defaults.copy()
if len(sys.argv) >= 2:
content = read(sys.argv[1])
if content == None:
print("No such file.")
return
print("Initializating...")
run(rules, parse(content))
else:
usage(sys.argv[0])
return
print("Modal v0.02")
help()
while True:
input = prompt("::> ")
if input == None:
break
elif parse(input) == parse("rules"):
print("Rules:")
prefix = ' ' * 4
for pattern, operation, parameters in rules:
if operation == apply:
print(prefix + inspect(pattern) + "-> " + inspect(parameters[0]))
elif parse(input) == parse("clear"):
rules = defaults
elif parse(input) == parse("help"):
help()
elif parse(input) == parse("quit") or parse(input) == parse("exit"):
break
else:
print("Reducing...")
print(inspect(seek(run(rules, parse(input)), ["SRT"])))
return
if __name__ == "__main__":
main()

235
src/modal.c
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@ -1,15 +1,16 @@
#include <stdio.h> #include <stdio.h>
typedef struct { typedef struct {
unsigned int id, refs, ptr; unsigned int id, refs;
char *a, *b, reg[0x10]; char *a, *b;
} Rule; } Rule;
static int flip, quiet, cycles = 0x10000; static int flip, quiet, debug, cycles = 0x10000;
static Rule rules[0x1000], *rules_ = rules, lambda; static Rule rules[0x1000], *rules_ = rules, lambda;
static char dict[0x8000], *dict_ = dict, empty; static char dict[0x8000], *dict_ = dict, empty;
static char bank_a[0x4000], *src_ = bank_a; static char bank_a[0x4000], *src_ = bank_a;
static char bank_b[0x4000], *dst_ = bank_b; static char bank_b[0x4000], *dst_ = bank_b;
static char *regs[0x100], stack[0x10], *stack_ = stack;
#define spacer(c) (c <= ' ' || c == '(' || c == ')') #define spacer(c) (c <= ' ' || c == '(' || c == ')')
@ -29,17 +30,48 @@ walk(char *s)
return s; return s;
} }
static void static int
write_reg(char r, char *reg) sint(char *s)
{ {
char c, *cap = walk(reg); char c;
switch(r) { int r = 0, n = 1;
case ':': /* op: output */ if(*s == '-') { n = -1, s++; }
if(*reg == '(') reg++, --cap; while((c = *s++) && !spacer(c)) r = r * 10 + c - '0';
while(reg < cap) { return r * n;
c = *reg++; }
static void
device_write(char *s)
{
char c = *s, *cap = walk(s), **reg = regs + '0';
/* phase: ALU */
if(*reg) {
int acc = sint(*reg++);
/* clang-format off */
switch(c) {
case '+': while(*reg) acc += sint(*reg++); break;
case '-': while(*reg) acc -= sint(*reg++); break;
case '*': while(*reg) acc *= sint(*reg++); break;
case '/': while(*reg) acc /= sint(*reg++); break;
case '%': while(*reg) acc %= sint(*reg++); break;
case '&': while(*reg) acc &= sint(*reg++); break;
case '^': while(*reg) acc ^= sint(*reg++); break;
case '|': while(*reg) acc |= sint(*reg++); break;
case '=': while(*reg) acc = acc == sint(*reg++); break;
case '!': while(*reg) acc = acc != sint(*reg++); break;
case '>': while(*reg) acc = acc > sint(*reg++); break;
case '<': while(*reg) acc = acc < sint(*reg++); break;
}
/* clang-format on */
dst_ += snprintf(dst_, 0x10, "%d", acc);
return;
}
/* phase: string */
if(*s == '(') s++, --cap;
while(s < cap) {
c = *s++;
if(c == '\\') { if(c == '\\') {
switch(*reg++) { switch(*s++) {
case 't': putc(0x09, stdout); break; case 't': putc(0x09, stdout); break;
case 'n': putc(0x0a, stdout); break; case 'n': putc(0x0a, stdout); break;
case 's': putc(0x20, stdout); break; case 's': putc(0x20, stdout); break;
@ -47,14 +79,27 @@ write_reg(char r, char *reg)
} else } else
putc(c, stdout); putc(c, stdout);
} }
return; }
case '~': { /* op: input */
static void
device_read(void)
{
char c, *origin = dst_;
while(fread(&c, 1, 1, stdin) && c >= ' ') while(fread(&c, 1, 1, stdin) && c >= ' ')
*dst_++ = c; *dst_++ = c;
if(feof(stdin)) if(feof(stdin))
*dst_++ = 'E', *dst_++ = 'O', *dst_++ = 'F'; *dst_++ = 'E', *dst_++ = 'O', *dst_++ = 'F';
return; if(dst_ - origin == 0)
dst_--;
} }
static void
write_reg(char r, char *reg)
{
char c, *cap = walk(reg);
switch(r) {
case ':': device_write(reg); return;
case '~': device_read(); return;
case '^': /* op: join */ case '^': /* op: join */
if(*reg == '(') reg++, --cap; if(*reg == '(') reg++, --cap;
while(reg < cap && (c = *reg++)) while(reg < cap && (c = *reg++))
@ -87,7 +132,7 @@ write_reg(char r, char *reg)
} }
static int static int
write_rule(Rule *r, char *s, int create) write_tail(char *s)
{ {
while((*dst_++ = *s++)) while((*dst_++ = *s++))
; ;
@ -96,34 +141,27 @@ write_rule(Rule *r, char *s, int create)
src_ = bank_b, dst_ = bank_a; src_ = bank_b, dst_ = bank_a;
else else
src_ = bank_a, dst_ = bank_b; src_ = bank_a, dst_ = bank_b;
if(!quiet) {
if(create)
fprintf(stderr, "<> (%s) (%s)\n", r->a, r->b);
else
fprintf(stderr, "%02d %s\n", r->id, src_), ++r->refs;
}
return 1; return 1;
} }
static int static int
apply_rule(Rule *r, char *s) apply_rule(Rule *r, char *s)
{ {
unsigned int i, id; unsigned char rid;
char c, *a = r->a, *b = r->b, *origin = dst_, *reg, *regs[0x08]; char c, *a = r->a, *b = r->b, *origin = dst_, *reg;
/* phase: clean registers */ /* phase: clean regs */
for(i = 0; i < r->ptr; i++) while(stack_ != stack) regs[(int)*(--stack_)] = 0;
regs[i] = NULL;
/* phase: match rule */ /* phase: match rule */
while((c = *a++)) { while((c = *a++)) {
if(c == '?') { if(c == '?') {
char *pcap = walk(s); char *pcap = walk(s);
id = *a++ - '0'; rid = *a++;
if((reg = regs[id])) { /* reg cmp */ if((reg = regs[rid])) { /* reg cmp */
char *rcap = walk(reg), *pp = s; char *rcap = walk(reg), *pp = s;
while(reg < rcap || pp < pcap) while(reg < rcap || pp < pcap)
if(*reg++ != *pp++) return 0; if(*reg++ != *pp++) return 0;
} else /* reg set */ } else /* reg set */
regs[id] = s; regs[rid] = s, *stack_++ = rid;
s = pcap; s = pcap;
} else if(c != *s++) } else if(c != *s++)
return 0; return 0;
@ -133,9 +171,9 @@ apply_rule(Rule *r, char *s)
/* phase: write rule */ /* phase: write rule */
while((c = *b++)) { while((c = *b++)) {
if(c == '?') { if(c == '?') {
id = *b - '0'; rid = *b;
if(id < 9 && (reg = regs[id])) if((reg = regs[rid]))
b++, write_reg(r->reg[id], reg); b++, write_reg(rid, reg);
else else
*dst_++ = c; *dst_++ = c;
} else } else
@ -145,55 +183,42 @@ apply_rule(Rule *r, char *s)
while(*s == ' ') s++; while(*s == ' ') s++;
if(*s == ')' && *(dst_ - 1) == ' ') dst_--; if(*s == ')' && *(dst_ - 1) == ' ') dst_--;
} }
return write_rule(r, s, 0); if(!quiet) fprintf(stderr, "%02d %s\n", r->id, src_), ++r->refs;
} return write_tail(s);
static int
find_register(Rule *r, char reg)
{
int i;
for(i = 0; i < (int)r->ptr; i++)
if(r->reg[i] == reg) return i;
return -1;
} }
static char * static char *
compile_rule(Rule *r, int id, char *src) parse_frag(char **side, char *src)
{ {
int wrapped;
char c, *cap; char c, *cap;
int wrapped, reg;
r->id = id, r->ptr = 0, r->a = &empty, r->b = &empty;
/* phase: compile left */
while((c = *src) && c == ' ') src++; while((c = *src) && c == ' ') src++;
if(c == ')' || (c == '<' && src[1] == '>')) return src; if(c == ')' || (c == '<' && src[1] == '>')) {
r->a = dict_, cap = walk(src), wrapped = c == '('; *side = &empty;
return src;
}
*side = dict_, cap = walk(src), wrapped = c == '(';
if(wrapped) src++, cap--; if(wrapped) src++, cap--;
while(src < cap) { while(src < cap) c = *src, *dict_++ = *src++;
c = *src, *dict_++ = *src++;
if(c == '?') {
c = *src++, reg = find_register(r, c);
if(reg == -1 && c != '(')
r->reg[r->ptr] = c, reg = r->ptr++;
*dict_++ = '0' + reg;
}
}
src += wrapped, *dict_++ = 0;
/* phase: compile right */
while((c = *src) && c == ' ') src++;
if(c == ')' || (c == '<' && src[1] == '>')) return src;
r->b = dict_, cap = walk(src), wrapped = c == '(';
if(wrapped) src++, cap--;
while(src < cap) {
c = *src, *dict_++ = *src++;
if(c == '?') {
c = *src++, reg = find_register(r, c);
*dict_++ = reg != -1 ? '0' + reg : c;
}
}
src += wrapped, *dict_++ = 0; src += wrapped, *dict_++ = 0;
return src; return src;
} }
static Rule *
find_rule(char *s, char *cap)
{
Rule *r = rules;
if(*s == '(') s++, cap--;
while(r < rules_) {
char *ss = s, *a = r->a;
if(a)
while(*ss++ == *a++)
if(!*a && ss == cap) return r;
r++;
}
return NULL;
}
static int static int
rewrite(void) rewrite(void)
{ {
@ -202,23 +227,47 @@ rewrite(void)
while((c = *s)) { while((c = *s)) {
if(c == '(' || spacer(last)) { if(c == '(' || spacer(last)) {
Rule *r = NULL; Rule *r = NULL;
/* phase: rule */ /* phase: undefine */
if(c == '<' && s[1] == '>') { if(c == '>' && s[1] == '<') {
r = rules_++; s += 2;
s = compile_rule(r, rules_ - rules - 1, s + 2);
while(*s == ' ') s++; while(*s == ' ') s++;
return write_rule(r, s, 1); cap = walk(s), r = find_rule(s, cap);
if(r != NULL) {
if(!quiet) fprintf(stderr, ">< (%s) (%s)\n", r->a, r->b);
r->a = 0;
}
while(*cap == ' ') cap++;
return write_tail(cap);
}
/* phase: define */
if(c == '<' && s[1] == '>') {
r = rules_, r->id = rules_ - rules;
s = parse_frag(&r->b, parse_frag(&r->a, s + 2));
if(*r->a) {
if(!quiet) fprintf(stderr, "<> (%s) (%s)\n", r->a, r->b);
rules_++;
}
while(*s == ' ') s++;
return write_tail(s);
} }
/* phase: lambda */ /* phase: lambda */
if(c == '?' && s[1] == '(') { if(c == '?' && s[1] == '(') {
cap = walk(s + 1), compile_rule(&lambda, -1, s + 2), s = cap; char *d_ = dict_;
cap = walk(s + 1);
r = &lambda, r->id = -1;
parse_frag(&r->b, parse_frag(&r->a, s + 2));
s = cap;
while(*s == ' ') s++; while(*s == ' ') s++;
if(!apply_rule(&lambda, s)) write_rule(&lambda, s, 0); if(!apply_rule(&lambda, s)) {
if(!quiet) fprintf(stderr, "%02d %s\n", r->id, src_), ++r->refs;
write_tail(s);
}
dict_ = d_;
return 1; return 1;
} }
/* phase: match */ /* phase: match */
for(r = rules; r < rules_; r++) for(r = rules; r < rules_; r++)
if(apply_rule(r, s)) return 1; if(r->a && apply_rule(r, s)) return 1;
} }
*dst_++ = last = c; *dst_++ = last = c;
s++; s++;
@ -231,19 +280,20 @@ int
main(int argc, char **argv) main(int argc, char **argv)
{ {
FILE *f; FILE *f;
int i, pl = 0, pr = 0; int i, pl = 0, pr = 0, rw = 0;
char c, last = 0, *w = bank_a; char c, last = 0, *w = bank_a;
if(argc < 2) if(argc < 2)
return !printf("usage: modal [-vqn] source.modal\n"); return !printf("usage: modal [-vqn] source.modal\n");
for(i = 1; i < argc && *argv[i] == '-'; i++) { for(i = 1; i < argc && *argv[i] == '-'; i++) {
switch(argv[i][1]) { switch(argv[i][1]) {
case 'v': /* version */ return !printf("Modal Interpreter, 26 Apr 2024.\n"); case 'v': /* version */ return !printf("Modal Interpreter, 4 May 2024.\n");
case 'q': /* quiet */ quiet = 1; break; case 'q': /* quiet */ quiet = 1; break;
case 'p': /* debug */ debug = 1; break;
case 'n': /* infinite */ cycles = 0xffffffff; break; case 'n': /* infinite */ cycles = 0xffffffff; break;
} }
} }
if(!(f = fopen(argv[i], "r"))) if(!(f = fopen(argv[i], "r")))
return !fprintf(stdout, "Modal file invalid: %s.\n", argv[i]); return !printf("Modal file invalid: %s.\n", argv[i]);
while(fread(&c, 1, 1, f)) { while(fread(&c, 1, 1, f)) {
c = c <= 0x20 ? 0x20 : c; c = c <= 0x20 ? 0x20 : c;
if(c == ' ' && last == '(') continue; if(c == ' ' && last == '(') continue;
@ -258,11 +308,20 @@ main(int argc, char **argv)
while(*(--w) <= ' ') *w = 0; while(*(--w) <= ' ') *w = 0;
fclose(f); fclose(f);
if(pr != pl) if(pr != pl)
return !fprintf(stdout, "Modal program imbalanced.\n"); return !fprintf(stderr, "Modal program imbalanced.\n");
while(rewrite()) while(rewrite() && ++rw)
if(!cycles--) return !fprintf(stdout, "Modal rewrites exceeded.\n"); if(!cycles--) return !fprintf(stderr, "Modal rewrites exceeded.\n");
while(rules_-- > rules && !quiet) if(!quiet) {
if(!rules_->refs) printf("-- Unused rule: %d <> (%s) (%s)\n", rules_->refs, rules_->a, rules_->b); while(rules_-- > rules) {
if(!quiet) printf(".. %s\n", src_); if(rules_->a) {
if(!rules_->refs)
fprintf(stderr, "-- Unused rule: %d <> (%s) (%s)\n", rules_->id, rules_->a, rules_->b);
if(debug)
fprintf(stderr, " (%s) (%s), %d times.\n", rules_->a, rules_->b, rules_->refs);
}
}
if(rw)
fprintf(stderr, ".. %s\nCompleted in %d rewrites.\n", src_, rw);
}
return 0; return 0;
} }