Add bba parser

Signed-off-by: Clifford Wolf <clifford@clifford.at>

bba/main.cc

@@ -1,15 +1,141 @@
-#include <unistd.h>
+#include <map>
+#include <vector>
+#include <string>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
 #include <assert.h>
+
+enum TokenType : int8_t
+{
+    TOK_LABEL,
+    TOK_REF,
+    TOK_U8,
+    TOK_U16,
+    TOK_U32
+};
+
+struct Stream
+{
+    std::string name;
+    std::vector<TokenType> tokenTypes;
+    std::vector<uint32_t> tokenValues;
+    std::vector<std::string> tokenComments;
+};
+
+Stream stringStream;
+std::vector<Stream> streams;
+std::map<std::string, int> streamIndex;
+std::vector<int> streamStack;
+
+std::vector<int> labels;
+std::map<std::string, int> labelIndex;
+
+std::vector<std::string> preText, postText;
+
+const char *skipWhitespace(const char *p)
+{
+    while (*p == ' ' || *p == '\t')
+        p++;
+    return p;
+}
+
 int main()
 {
+    bool verbose = true;
+    // bool bigEndian = false;
     char buffer[512];
-    int i, j;
+
-    while (1) {
+    while (fgets(buffer, 512, stdin) != nullptr)
-        i = read(0, buffer, 512);
+    {
-        if (i == 0) break;
+        std::string cmd = strtok(buffer, " \t\r\n");
-        assert(i > 0);
+
-        j = write(1, buffer, i);
+        if (cmd == "pre") {
-        assert(i == j);
+            const char *p = skipWhitespace(strtok(nullptr, "\r\n"));
+            preText.push_back(p);
+            continue;
         }
+
+        if (cmd == "post") {
+            const char *p = skipWhitespace(strtok(nullptr, "\r\n"));
+            postText.push_back(p);
+            continue;
+        }
+
+        if (cmd == "push") {
+            const char *p = strtok(buffer, " \t\r\n");
+            if (streamIndex.count(p) == 0) {
+                streamIndex[p] = streams.size();
+                streams.resize(streams.size() + 1);
+                streams.back().name = p;
+            }
+            streamStack.push_back(streamIndex.at(p));
+            continue;
+        }
+
+        if (cmd == "pop") {
+            streamStack.pop_back();
+            continue;
+        }
+
+        if (cmd == "label" || cmd == "ref") {
+            const char *label = strtok(buffer, " \t\r\n");
+            const char *comment = skipWhitespace(strtok(buffer, "\r\n"));
+            Stream &s = streams.at(streamStack.back());
+            if (labelIndex.count(label) == 0) {
+                labelIndex[label] = labels.size();
+                labels.push_back(-1);
+            }
+            s.tokenTypes.push_back(cmd == "label" ? TOK_LABEL : TOK_REF);
+            s.tokenValues.push_back(labelIndex.at(label));
+            if (verbose)
+                s.tokenComments.push_back(comment);
+            continue;
+        }
+
+        if (cmd == "u8" || cmd == "u16" || cmd == "u32") {
+            const char *value = strtok(buffer, " \t\r\n");
+            const char *comment = skipWhitespace(strtok(buffer, "\r\n"));
+            Stream &s = streams.at(streamStack.back());
+            s.tokenTypes.push_back(cmd == "u8" ? TOK_U8 : cmd == "u16" ? TOK_U16 : TOK_U32);
+            s.tokenValues.push_back(atoll(value));
+            if (verbose)
+                s.tokenComments.push_back(comment);
+            continue;
+        }
+
+        if (cmd == "s") {
+            const char *value = skipWhitespace(strtok(buffer, "\r\n"));
+            std::string label = std::string("str:") + value;
+            Stream &s = streams.at(streamStack.back());
+            if (labelIndex.count(label) == 0) {
+                labelIndex[label] = labels.size();
+                labels.push_back(-1);
+            }
+            s.tokenTypes.push_back(TOK_REF);
+            s.tokenValues.push_back(labelIndex.at(label));
+            if (verbose)
+                s.tokenComments.push_back(value);
+            stringStream.tokenTypes.push_back(TOK_LABEL);
+            stringStream.tokenValues.push_back(labelIndex.at(label));
+            while (1) {
+                stringStream.tokenTypes.push_back(TOK_U8);
+                stringStream.tokenValues.push_back(*value);
+                if (*value == 0)
+                    break;
+                value++;
+            }
+            continue;
+        }
+
+        abort();
+    }
+
+    assert(!streams.empty());
+    assert(streamStack.empty());
+    streams.push_back(Stream());
+    streams.back().tokenTypes.swap(stringStream.tokenTypes);
+    streams.back().tokenValues.swap(stringStream.tokenValues);
+
     return 0;
 }