From 94f12e10063b84f4d0d54eb4217eadeaf1198ad4 Mon Sep 17 00:00:00 2001
From: Augusto Gunsch <augustogunsch@tutanota.com>
Date: Thu, 29 Oct 2020 21:22:03 -0300
Subject: [PATCH] Add parser

---
 .gitignore |   1 +
 Makefile   |   7 ++++
 main.c     |  33 ++++++++++++++++
 parser.c   | 112 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 parser.h   |  11 ++++++
 5 files changed, 164 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Makefile
 create mode 100644 main.c
 create mode 100644 parser.c
 create mode 100644 parser.h

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..4c61528
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+vmtranslator
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..39b7d39
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,7 @@
+FILES = parser.c main.c
+INCLUDES = -I.
+CFLAGS = -std=c99 -g
+OUTFILE = vmtranslator
+
+main: ${FILES}
+	${CC} ${CFLAGS} ${INCLUDES} -o ${OUTFILE} ${FILES}
diff --git a/main.c b/main.c
new file mode 100644
index 0000000..9ad23e6
--- /dev/null
+++ b/main.c
@@ -0,0 +1,33 @@
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include "parser.h"
+
+int main(int argc, char* argv[]) {
+	if(argc < 2) {
+		fprintf(stderr, "Usage: %s {file}\n", argv[0]);
+		return 1;
+	}
+	
+	FILE* input = fopen(argv[1], "r");
+
+	if(input == NULL) {
+		fprintf(stderr, "%s\n", strerror(errno));
+		return errno;
+	}
+
+	int lncount, widestln, maxtokens;
+	getinfo(input, &lncount, &widestln, &maxtokens);
+	struct line** lns = parse(input, lncount, widestln, maxtokens);
+	
+	printf("lns: %i\n", lncount);
+	for(int i = 0; i < lncount; i++) {
+		int tkcount = lns[i]->tokenscount;
+		for(int j = 0; j < tkcount; j++) {
+			printf("%s ", lns[i]->tokens[j]);
+		}
+		printf("\n");
+	}
+
+	return 0;
+}
diff --git a/parser.c b/parser.c
new file mode 100644
index 0000000..8924163
--- /dev/null
+++ b/parser.c
@@ -0,0 +1,112 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <string.h>
+#include "parser.h"
+
+void gountilbrk (FILE* input) {
+	char c;
+	while(c = fgetc(input), c != -1) {
+		if(c == '\n') {
+			ungetc(c, input);
+			return;
+		}
+	}
+}
+
+void getinfo(FILE* input, int* lncount, int* widestln, int* maxtokens) {
+	char c, nc;
+	int lns = 0;
+	int widest = 0;
+	int currsz = 0;
+	int tokens = 0;
+	int maxtoks = 0;
+	short readsmt = 0;
+	while(c = fgetc(input), c != -1) {
+		if(isspace(c) && readsmt) {
+			tokens++;
+			if(c == '\n') {
+				lns++;
+				if(currsz > widest)
+					widest = currsz;
+				if(tokens > maxtoks)
+					maxtoks = tokens;
+				currsz = 0;
+				tokens = 0;
+			}
+			readsmt = 0;
+			continue;
+		}
+
+		if(c == '/') {
+			nc = fgetc(input);
+			if(nc == '/') {
+				gountilbrk(input);
+				continue;
+			}
+			ungetc(nc, input);
+		}
+
+		currsz++;
+		readsmt = 1;
+	}
+	rewind(input);
+	(*lncount) = lns;
+	(*widestln) = widest;
+	(*maxtokens) = maxtoks;
+}
+
+struct line** parse(FILE* input, int lncount, int widestln, int maxtokens) {
+	struct line** lns = (struct line**)malloc(sizeof(struct line*)*lncount);
+	char c, nc;
+	short readsmt = 0;
+	char tmp[widestln];
+	char* tokens[maxtokens];
+	int tmpind = 0;
+	int lnsind = 0;
+	int tokensind = 0;
+	int truelncount = 0;
+	while(c = fgetc(input), c != -1) {
+		if(isspace(c)) {
+			if(readsmt) {
+				tmp[tmpind] = '\0';
+				char* newtoken = (char*)malloc(sizeof(char)*tmpind+1);
+				strcpy(newtoken, tmp);
+				tokens[tokensind] = newtoken;
+				tmpind = 0;
+				readsmt = 0;
+				tokensind++;
+			}
+			if(c == '\n') {
+				truelncount++;
+				if(tokensind > 0) {
+					struct line* newln = (struct line*)malloc(sizeof(struct line));
+					newln->tokens = (char**)malloc(sizeof(char*)*tokensind);
+					for(int i = 0; i < tokensind; i++) {
+						newln->tokens[i] = tokens[i];
+					}
+					newln->tokenscount = tokensind;
+					newln->truen = truelncount;
+					lns[lnsind] = newln;
+					lnsind++;
+					tokensind = 0;
+				}
+			}
+			continue;
+		}
+		
+		if(c == '/') {
+			nc = fgetc(input);
+			if(nc == '/') {
+				gountilbrk(input);
+				continue;
+			}
+			ungetc(nc, input);
+		}
+		
+		tmp[tmpind] = c;
+		tmpind++;
+		readsmt = 1;
+	}
+	return lns;
+}
diff --git a/parser.h b/parser.h
new file mode 100644
index 0000000..a72d102
--- /dev/null
+++ b/parser.h
@@ -0,0 +1,11 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+struct line {
+	char** tokens;
+	int tokenscount;
+	int truen;
+};
+
+void getinfo(FILE* input, int* lncount, int* widestln, int* maxtokens);
+struct line** parse(FILE* input, int lncount, int widestln, int maxtokens);