rewrite parsing codes with parserlib.

1 files changed, 68 insertions, 0 deletions

diff --git a/MoonParser/ast.cpp b/MoonParser/ast.cpp
new file mode 100644
index 0000000..66f6493
--- /dev/null
+++ b/MoonParser/ast.cpp
@@ -0,0 +1,68 @@
+#include <cassert>
+#include "ast.hpp"
+
+
+namespace parserlib {
+
+
+//current AST container.
+static ast_container *_current = 0;
+
+
+/** sets the container under construction to be this.
+ */
+ast_container::ast_container() {
+    _current = this;
+}
+
+
+/** sets the container under construction to be this.
+    @param src source object.
+ */
+ast_container::ast_container(const ast_container &src) {
+    _current = this;
+}
+
+    
+/** Asks all members to construct themselves from the stack.
+    The members are asked to construct themselves in reverse order.
+    from a node stack.
+    @param st stack.
+ */
+void ast_container::construct(ast_stack &st) {
+    for(ast_member_vector::reverse_iterator it = m_members.rbegin();
+        it != m_members.rend();
+        ++it)
+    {
+        ast_member *member = *it;
+        member->construct(st);
+    }
+}
+
+
+//register the AST member to the current container.
+void ast_member::_init() {
+    assert(_current);
+    m_container = _current;
+    _current->m_members.push_back(this);
+}
+
+
+/** parses the given input.
+    @param i input.
+    @param g root rule of grammar.
+    @param ws whitespace rule.
+    @param el list of errors.
+    @param ud user data, passed to the parse procedures.
+    @return pointer to ast node created, or null if there was an error.
+        The return object must be deleted by the caller.
+ */
+ast_node *parse(input &i, rule &g, error_list &el, void* ud) {
+    ast_stack st;
+    if (!parse(i, g, el, &st, ud)) return 0;
+    assert(st.size() == 1);
+    return st[0];
+}
+
+
+} //namespace parserlib