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#include "cccl.h"
#include <assert.h>
#include <err.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
static enum cccl_NodeType get_nodetype(char c)
{
switch (c)
{
#define X(char, name) case char: return cccl_Node_##name
X('^', PUSHZERO);
X('+', INCREMENT);
X('-', DECREMENT);
X('*', ADD);
X('~', SUBTRACT);
X('%', REVERSE);
X('=', ASSIGN);
X('!', DELETE);
X('$', PUSHVAR);
X('&', ASSIGNLOCAL);
X('<', OUTPUT);
X('>', INPUT);
X('{', PROCEDURE);
X('}', PROCEDURE);
X('@', CALL);
X('(', INFINITE);
X(')', INFINITE);
X('[', REPEAT);
X(']', REPEAT);
X('#', END);
X(':', CONTINUE);
X('?', CONDITIONAL);
X(';', CONDITIONAL);
#undef X
}
err(1, "Unrecognized command: [%d] %c", c, c);
}
struct cccl_Node *cccl_parse(struct cccl_Token tokens[], size_t tokens_length, enum cccl_NodeType type, char value)
{
struct cccl_Node *res = malloc(sizeof(*res));
*res = (struct cccl_Node)
{
.type = type,
.in = NULL,
.in_length = 0,
.value = value,
};
for (size_t i = 0; i < tokens_length; ++i)
{
if (verbose)
fprintf(stderr, "T:[%c:%s] ", tokens[i].value, cccl_strtoken(tokens[i].type));
switch (tokens[i].type)
{
case cccl_Token_COMMAND: case cccl_Token_COMMANDWITHARG: case cccl_Token_BLOCKSTART:
{
if (!res->in)
{
res->in_length = 1;
res->in = malloc(sizeof(*res->in));
} else
{
++res->in_length;
res->in = realloc(res->in, sizeof(*res->in) * res->in_length);
}
} break;
}
switch (tokens[i].type)
{
case cccl_Token_COMMAND:
{
res->in[res->in_length - 1] = cccl_parse(
NULL, 0,
get_nodetype(tokens[i].value),
0
);
} break;
case cccl_Token_COMMANDWITHARG:
{
assert(i + 1 != tokens_length);
assert(tokens[i + 1].type == cccl_Token_IDENTIFIER);
res->in[res->in_length - 1] = cccl_parse(
NULL, 0,
get_nodetype(tokens[i].value),
tokens[i + 1].value
);
} break;
case cccl_Token_BLOCKSTART:
{
assert(i > 0);
assert(tokens[i - 1].type == cccl_Token_IDENTIFIER);
char opening = tokens[i].value, closing;
switch (tokens[i].value)
{
break; case '{': closing = '}';
break; case '(': closing = ')';
break; case '[': closing = ']';
break; case '?': closing = ';';
}
size_t oldi = i++;
int depth = 1;
for (; i < tokens_length; ++i)
{
if (verbose)
fprintf(stderr, "S:[%c %c %d] ", tokens[i].value, closing, depth);
if (tokens[i].value == opening)
++depth;
else if (tokens[i].value == closing)
--depth;
if (depth == 0)
goto end;
}
errx(1, "No matching bracket for %c", opening);
end:
if (verbose)
fputs("\nExploring inner...\n", stderr);
res->in[res->in_length - 1] = cccl_parse(
tokens + oldi + 1,
i - oldi - 1,
get_nodetype(tokens[i].value),
tokens[oldi - 1].value
);
} break;
}
}
return res;
}
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