PROGN working

src/init.c

@@ -78,23 +78,24 @@ int main( int argc, char *argv[] ) {
     /*
      * primitive function operations 
      */
+    bind_function( "add", &lisp_add );
+    bind_function( "apply", &lisp_apply );
     bind_function( "assoc", &lisp_assoc );
     bind_function( "car", &lisp_car );
     bind_function( "cdr", &lisp_cdr );
     bind_function( "cons", &lisp_cons );
     bind_function( "eq", &lisp_eq );
     bind_function( "equal", &lisp_equal );
+    bind_function( "multiply", &lisp_multiply );
     bind_function( "read", &lisp_read );
     bind_function( "print", &lisp_print );
+    bind_function( "progn", &lisp_progn );
+    bind_function( "subtract", &lisp_subtract );
     bind_function( "type", &lisp_type );
 
-    bind_function( "add", &lisp_add );
     bind_function( "+", &lisp_add );
-    bind_function( "multiply", &lisp_multiply );
     bind_function( "*", &lisp_multiply );
-    bind_function( "subtract", &lisp_subtract );
     bind_function( "-", &lisp_subtract );
-    bind_function( "apply", &lisp_apply );
 
     /*
      * primitive special forms 

src/lispops.c

@@ -366,7 +366,7 @@ lisp_print( struct stack_frame *frame, struct cons_pointer env ) {
 
 
 /**
- * Get the Lisp type of the single argument.
+ * Function: Get the Lisp type of the single argument.
  * @param frame My stack frame.
  * @param env My environment (ignored).
  * @return As a Lisp string, the tag of the object which is the argument.
@@ -384,6 +384,35 @@ lisp_type( struct stack_frame *frame, struct cons_pointer env ) {
     return result;
 }
 
+/**
+ * Function; evaluate the forms which are listed in my single argument 
+ * sequentially and return the value of the last. This function is called 'do'
+ * in some dialects of Lisp.
+ * 
+ * @param frame My stack frame.
+ * @param env My environment (ignored).
+ * @return the value of the last form on the sequence which is my single 
+ * argument.
+ */
+struct cons_pointer 
+lisp_progn( struct stack_frame *frame, struct cons_pointer env ) {
+    struct cons_pointer remaining = frame->arg[0];
+    struct cons_pointer result = NIL;
+    
+    while ( consp(remaining)) {
+        struct cons_space_object cell = pointer2cell( remaining );
+        struct stack_frame * next = make_empty_frame(frame, env);
+        next->arg[0] = cell.payload.cons.car;
+        inc_ref( next->arg[0] );
+        result = lisp_eval(next, env);        
+        free_stack_frame( next);
+        
+        remaining = cell.payload.cons.cdr;
+    }
+    
+    return result;
+}
+
 
 /**
  * TODO: make this do something sensible somehow.

src/lispops.h

@@ -49,7 +49,7 @@ struct cons_pointer lisp_read( struct stack_frame *frame,
 struct cons_pointer lisp_print( struct stack_frame *frame,
                                 struct cons_pointer env );
 /**
- * Get the Lisp type of the single argument.
+ * Function: Get the Lisp type of the single argument.
  * @param frame My stack frame.
  * @param env My environment (ignored).
  * @return As a Lisp string, the tag of the object which is the argument.
@@ -57,6 +57,20 @@ struct cons_pointer lisp_print( struct stack_frame *frame,
 struct cons_pointer
 lisp_type( struct stack_frame *frame, struct cons_pointer env );
 
+
+/**
+ * Function; evaluate the forms which are listed in my single argument 
+ * sequentially and return the value of the last. This function is called 'do'
+ * in some dialects of Lisp.
+ * 
+ * @param frame My stack frame.
+ * @param env My environment (ignored).
+ * @return the value of the last form on the sequence which is my single 
+ * argument.
+ */
+struct cons_pointer 
+lisp_progn( struct stack_frame *frame, struct cons_pointer env );
+
 /*
  * neither, at this stage, really 
  */

unit-tests/add.sh

@@ -6,14 +6,13 @@ actual=`echo "(add 2 3)" | target/psse 2> /dev/null | head -2 | tail -1`
 if [ "${expected}" = "${actual}" ]
 then
     echo "OK"
-    exit 0
 else
     echo "Fail: expected '${expected}', got '${actual}'"
     exit 1
 fi
 
-expected='5.5000'
-actual=`echo "(add 2.5 3)" | target/psse 2> /dev/null | head -1`
+expected='5.500000'
+actual=`echo "(add 2.5 3)" | target/psse 2> /dev/null | head -2 | tail -1`
 
 if [ "${expected}" = "${actual}" ]
 then

unit-tests/multiply.sh

@@ -0,0 +1,24 @@
+#!/bin/bash
+
+expected='6'
+actual=`echo "(multiply 2 3)" | target/psse 2> /dev/null | head -2 | tail -1`
+
+if [ "${expected}" = "${actual}" ]
+then
+    echo "OK"
+else
+    echo "Fail: expected '${expected}', got '${actual}'"
+    exit 1
+fi
+
+expected='7.500000'
+actual=`echo "(multiply 2.5 3)" | target/psse 2> /dev/null | head -2 | tail -1`
+
+if [ "${expected}" = "${actual}" ]
+then
+    echo "OK"
+    exit 0
+else
+    echo "Fail: expected '${expected}', got '${actual}'"
+    exit 1
+fi

unit-tests/progn.sh

@@ -0,0 +1,24 @@
+#!/bin/bash
+
+expected='5'
+actual=`echo "(progn '((add 2 3)))" | target/psse 2> /dev/null | head -2 | tail -1`
+
+if [ "${expected}" = "${actual}" ]
+then
+    echo "OK"
+    exit 0
+else
+    echo "Fail: expected '${expected}', got '${actual}'"
+fi
+
+expected='"foo"'
+actual=`echo "(progn '((add 2.5 3) \"foo\"))" | target/psse 2> /dev/null | head -1`
+
+if [ "${expected}" = "${actual}" ]
+then
+    echo "OK"
+    exit 0
+else
+    echo "Fail: expected '${expected}', got '${actual}'"
+    exit 1
+fi