From f181a8f04dfdfd8829861e0d0d549f39e40081e6 Mon Sep 17 00:00:00 2001
From: Marvin Borner
Date: Thu, 13 May 2021 12:03:43 +0200
Subject: New layout

---
 src/preprocess.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)
 create mode 100644 src/preprocess.c

(limited to 'src/preprocess.c')

diff --git a/src/preprocess.c b/src/preprocess.c
new file mode 100644
index 0000000..673bd20
--- /dev/null
+++ b/src/preprocess.c
@@ -0,0 +1,46 @@
+#include <assert.h>
+#include <log.h>
+#include <preprocess.h>
+#include <string.h>
+#include <sys/param.h>
+
+static void preprocess_erase(struct ctx *ctx, size_t start)
+{
+	assert(ctx->raw[start] == '#');
+
+	for (size_t i = start; i < ctx->size; i++) {
+		char cur = ctx->raw[i];
+		if (cur == '\n' || cur == '\0')
+			break;
+
+		ctx->raw[i] = ' '; // Spaces get skipped by tokenizer anyways
+	}
+}
+
+void preprocess(struct ctx *ctx)
+{
+	for (size_t i = 0; i < ctx->size; i++) {
+		const char cur = ctx->raw[i];
+
+		ctx->column++;
+
+		if (cur == '\n') {
+			ctx->line++;
+			ctx->column = 0;
+			continue;
+		} else if (cur == '\0') {
+			break;
+		} else if (cur == '#' && ctx->column == 1) {
+			if (strncmp(ctx->raw + i + 1, "inc ", MIN(4, ctx->size - i)) == 0) {
+				// TODO: Add include features
+			} else {
+				errln(ctx, "Invalid preprocessing directive");
+			}
+			preprocess_erase(ctx, i);
+		}
+	}
+
+	ctx->data = ctx->raw;
+	ctx->line = 0;
+	ctx->column = 0;
+}
-- 
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