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#include <assert.h>
#include <math.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <log.h>
#include <preprocess.h>
static void preprocess_erase(struct ctx *ctx, size_t start)
{
assert(ctx->data[start] == '#');
for (size_t i = start; i < ctx->size; i++) {
char cur = ctx->data[i];
if (cur == '\n' || cur == '\0')
break;
ctx->data[i] = ' '; // Spaces get skipped by tokenizer anyways
}
}
void preprocess(struct ctx *ctx)
{
ctx->size = ctx->location.size;
ctx->data = malloc(ctx->size);
memcpy(ctx->data, ctx->location.data, ctx->size);
for (size_t i = 0; i < ctx->location.size; i++) {
const char cur = ctx->location.data[i];
ctx->location.column++;
if (cur == '\n') {
ctx->location.line++;
ctx->location.column = 0;
continue;
} else if (cur == '\0') {
break;
} else if (cur == '#' && ctx->location.column == 1) {
if (strncmp(ctx->location.data + i + 1, "inc ",
fmin(4, ctx->location.size - i)) == 0) {
// TODO: Add include features
} else if (*(ctx->location.data + i + 1) == '#') {
// Comment
} else {
errln(&ctx->location, "Invalid preprocessing directive");
}
preprocess_erase(ctx, i);
}
}
context_rewind(ctx);
}
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