Fixed float addition.

One can now add floats, will also print the AST.

.clang-format

@@ -1,12 +1,13 @@
 ---
-BasedOnStyle: LLVM
 AlignConsecutiveShortCaseStatements:
   Enabled: true
   AcrossEmptyLines: true
   AcrossComments: true
+IndentCaseLabels: true
 AllowShortBlocksOnASingleLine: Always
 AllowShortCaseLabelsOnASingleLine: true
 AllowShortIfStatementsOnASingleLine: AllIfsAndElse
 AllowShortLoopsOnASingleLine: true
 IndentWidth: 4
 PointerAlignment: Left
+AlignAfterOpenBracket: BlockIndent

.gitignore

@@ -5,3 +5,4 @@ tags
 .cache
 build/*
 compile_commands.json
+vgcore.*

Makefile

@@ -14,7 +14,7 @@ TEST_OBJ_DIR = $(TEST_BUILD_DIR)/obj
 CC = clang
 LINK = clang
 CFLAGS = -Wall -DDBG -ggdb
-LDFLAGS =
+LDFLAGS = -lm
 
 SRC_FILES = $(wildcard $(SRC_DIR)/*.c)
 OBJ_FILES = $(patsubst $(SRC_DIR)/%.c, $(OBJ_DIR)/%.o, $(SRC_FILES))

README.md

@@ -1,4 +1,4 @@
-# SCL: Simple Calculator Language
+# SCL: Simple CAS Language
 
 ## Syntax
 
@@ -12,16 +12,24 @@ As one would expect, you can evaluate simple infix expressions:
 You can also define your own functions:
 
 ```scl
-> f(x) 2x
+> f(x) = 2x
 > f(2)
 = 4
 ```
 
+Symbolic algebra is done in the following manner:
+
+```scl
+> f(x) = e^x
+> diff(f, x:sym, 2)
+= e^x
+```
+
 SCL will dynamically decide on types, but you can state them explicitly as
 well:
 
 ```scl
-> f(x:int) 2x
+> f(x:int) = 2x
 > f(2.2)
 ! f(x:int): x must be of type int.
 ```
@@ -32,6 +40,5 @@ Variables can be defined, with several attributes:
 > a = 1             // Interpret type automatically.
 > b:int = 1         // Must be int.
 > c:const:int = 1   // Constant: value can never change.
-> d:lazy = (1 + 1)  // Interpreter will wait as long as possible before
-                    // evaluating.
+> x:sym             // Treated symbolicaly.
 ```

src/ast.c

@@ -1,6 +1,7 @@
 #include <stdio.h>
 
 #include "include/ast.h"
+#include "include/dstr.h"
 #include "include/util.h"
 
 extern AST* root;
@@ -23,36 +24,59 @@ void ast_destroy(AST* ast) {
     if (!ast) return;
 
     switch (ast->type) {
-    case AST_TYPE_NUM:  ast_type_num_destroy(ast->data); break;
-    case AST_TYPE_CALL: ast_type_call_destroy(ast->data); break;
-    default:            log_dbgf("Unknown ast type %d (max: %d)", ast->type, AST_TYPE_MAX);
+        case AST_TYPE_NUM:  ast_num_data_destroy(ast->data); break;
+        case AST_TYPE_CALL: ast_call_data_destroy(ast->data); break;
+        default:
+            log_dbgf("Unknown ast type %d (max: %d)", ast->type, AST_TYPE_MAX);
     }
 }
 
-void ast_print(AST* ast) {
-    log_dbgf("Tree type: %s", asttype_names[ast->type]);
-    fflush(stdout);
+void ast_print(AST* ast) { ast_print_i(ast, 0); }
+
+void ast_print_i(AST* ast, int i) {
+    INDENT_BEGIN(i);
+
+    INDENT_TITLE("AST", ast);
+    INDENT_FIELD("type", "%s", asttype_names[ast->type]);
+    INDENT_FIELD_EXT_NONL_START("data");
+    switch (ast->type) {
+        case AST_TYPE_NUM:
+            printf("%s  %lf\n", INDENT_spacing->buf, *(ASTNumData*)ast->data);
+            break;
+        case AST_TYPE_CALL: ast_call_print(ast->data, i + 2); break;
+        default:            exit(1);
+    }
+    INDENT_FIELD_NONL_END;
+    INDENT_END;
 }
 
-
-ASTNumData* ast_type_num_init(int val) {
+ASTNumData* ast_num_data_init(double val) {
     talloc(ASTNumData, num);
 
-    num->val = val;
+    log_dbgf("val: %lf", val);
+
+    *num = val;
 
     return num;
 }
 
-void ast_type_num_destroy(ASTNumData* num) {
-    if (!num)
-        return
-
-            free(num);
+void ast_num_data_destroy(ASTNumData* num) {
+    if (!num) return free(num);
 }
 
-ASTCallData* ast_type_call_init(char* to, size_t argc, AST** argv) {
+void ast_num_print(ASTNumData* data, int i) {
+    INDENT_BEGIN(i);
+
+    INDENT_FIELD("data", "%lf", *data);
+
+    INDENT_END;
+}
+
+ASTCallData* ast_call_data_init(char* to, size_t argc, AST** argv) {
     talloc(ASTCallData, call);
 
+    log_dbgf("to: %s", to);
+
     call->to = to;
     call->argc = argc;
     call->argv = argv;
@@ -60,11 +84,19 @@ ASTCallData* ast_type_call_init(char* to, size_t argc, AST** argv) {
     return call;
 }
 
-void ast_type_call_destroy(ASTCallData* call) {
-    if (!call)
-        return
-
-            free(call->to);
+void ast_call_data_destroy(ASTCallData* call) {
+    if (!call) return free(call->to);
     for (size_t i = 0; i < call->argc; i++) free(call->argv[i]);
     free(call);
 }
+
+void ast_call_print(ASTCallData* data, int i) {
+    INDENT_BEGIN(i);
+
+    INDENT_TITLE("ASTCallData", data);
+    INDENT_FIELD("to", "%s", data->to);
+    INDENT_FIELD("argc", "%ld", data->argc);
+    INDENT_FIELD_LIST("argv", data->argv, data->argc, ast_print_i);
+
+    INDENT_END;
+}

src/dstr.c

@@ -25,8 +25,10 @@ void dstr_append(Dstr* dest, char* src, size_t ln) {
         // Double the buffer size when overflown.
         dest->bufsz *= 2;
         dest->buf = realloc(dest->buf, dest->bufsz);
-        log_dbgf("dstr @ %p doubled from %ld to %ld", dest, dest->bufsz / 2,
-                 dest->bufsz);
+        log_dbgf(
+            "dstr @ %p doubled from %ld to %ld", dest, dest->bufsz / 2,
+            dest->bufsz
+        );
     }
 
     // Overwrites the \0 at the end of the string, keeps the null from the given
@@ -40,8 +42,10 @@ void dstr_appendch(Dstr* dest, char ch) {
         // Double the buffer size when overflown.
         dest->bufsz *= 2;
         dest->buf = realloc(dest->buf, dest->bufsz);
-        log_dbgf("dstr @ %p doubled from %ld to %ld", dest, dest->bufsz / 2,
-                 dest->bufsz);
+        log_dbgf(
+            "dstr @ %p doubled from %ld to %ld", dest, dest->bufsz / 2,
+            dest->bufsz
+        );
     }
 
     // Overwrites the preexisting null terminator, and adds one of its own.

src/exec.c

@@ -7,26 +7,33 @@
 
 extern AST* root;
 
-void exec_expr() {
-    ast_print(root);
+ASTNumData exec_expr(AST* ast) {
+    // ast_print(ast);
     log_dbg("Started execution.");
-    switch (root->type) {
-    case AST_TYPE_CALL: exec_call(); break;
+    switch (ast->type) {
+        case AST_TYPE_CALL: return exec_call(ast);
+        case AST_TYPE_NUM:  return *(ASTNumData*)ast->data;
         default:            printf("what\n");
     }
 }
 
-void exec_call() {
+ASTNumData exec_call(AST* ast) {
     log_dbg("Started call execution.");
     fflush(stdout);
-    ASTCallData* calldata = (ASTCallData*)root->data;
+    ASTCallData* calldata = (ASTCallData*)ast->data;
     if (!strcmp(calldata->to, "+") && calldata->argc == 2) {
 
+        /*
         ASTNumData* n1 = (ASTNumData*)calldata->argv[0]->data;
         ASTNumData* n2 = (ASTNumData*)calldata->argv[1]->data;
+        */
 
-        exec_return(n1->val + n2->val);
+        ASTNumData n1 = exec_expr(calldata->argv[0]);
+        ASTNumData n2 = exec_expr(calldata->argv[1]);
+
+        return n1 + n2;
     }
+    return -1000;
 }
 
-void exec_return(int n) { printf("= %d\n", n); }
+void exec_print(double n) { printf("= %lf\n", n); }

src/grammar.y

@@ -14,14 +14,14 @@
 }
 
 %union {
-    int intval;
+    double fval;
     char* strval;
     AST* ast;
 }
 
 %define parse.error verbose
 
-%token<intval> NUM
+%token<fval> NUM
 %token<strval> CALL
 %token PLUS
 %token NL
@@ -35,13 +35,12 @@ input:
     ;
 
 exp:
-    NUM { $$ = ast_init(AST_TYPE_NUM, ast_type_num_init($1)); }
+    NUM { $$ = ast_init(AST_TYPE_NUM, ast_num_data_init($1)); }
     | NUM PLUS NUM {
-        AST* argv[2] = {
-            ast_init(AST_TYPE_NUM, ast_type_num_init($1)),
-            ast_init(AST_TYPE_NUM, ast_type_num_init($3))
-        };
-        $$ = ast_init(AST_TYPE_CALL, ast_type_call_init("+", 2, argv));
-    };
+        AST** argv = calloc(2, sizeof(AST*));
+        argv[0] = ast_init(AST_TYPE_NUM, ast_num_data_init($1));
+        argv[1] = ast_init(AST_TYPE_NUM, ast_num_data_init($3));
+        $$ = ast_init(AST_TYPE_CALL, ast_call_data_init("+", 2, argv));
+    }
 
 %%

src/include/ast.h

@@ -17,13 +17,13 @@ typedef struct {
 AST* ast_init(ASTType type, void* data);
 void ast_destroy(AST* ast);
 void ast_print(AST* ast);
+void ast_print_i(AST* ast, int i);
 
-typedef struct {
-    int val;
-} ASTNumData;
+typedef double ASTNumData;
 
-ASTNumData* ast_type_num_init(int val);
-void ast_type_num_destroy(ASTNumData* num);
+ASTNumData* ast_num_data_init(double val);
+void ast_num_data_destroy(ASTNumData* num);
+void ast_num_print(ASTNumData*, int i);
 
 typedef struct {
     char* to;       // What the call's to.
@@ -31,7 +31,8 @@ typedef struct {
     AST** argv;     // Argument vector.
 } ASTCallData;
 
-ASTCallData* ast_type_call_init(char* to, size_t argc, AST** argv);
-void ast_type_call_destroy(ASTCallData* call);
+ASTCallData* ast_call_data_init(char* to, size_t argc, AST** argv);
+void ast_call_data_destroy(ASTCallData* call);
+void ast_call_print(ASTCallData*, int i);
 
 #endif

src/include/exec.h

@@ -1,8 +1,10 @@
 #ifndef EXEC_H
 #define EXEC_H
 
-void exec_expr();
-void exec_call();
-void exec_return(int n);
+#include "ast.h"
+
+ASTNumData exec_expr(AST* ast);
+ASTNumData exec_call(AST* ast);
+void exec_print(double n);
 
 #endif

src/include/lexer.h

@@ -4,19 +4,25 @@
 #include <assert.h>
 
 #ifdef __has_include
-    #if __has_include("../../build/grammars/grammar.tab.h")
-        #include "../../build/grammars/grammar.tab.h"
-    #else
-        #warn "Build resources not present!"
-    #endif
+#if __has_include("../../build/grammars/grammar.tab.h")
+#include "../../build/grammars/grammar.tab.h"
 #else
-    #warn "Not sure whether build-time resources are present."
-    #include "../../build/grammars/grammar.tab.h"
+#warn "Build resources not present!"
+#endif
+#else
+#warn "Not sure whether build-time resources are present."
+#include "../../build/grammars/grammar.tab.h"
 #endif
 
 extern YYSTYPE yylval;
 extern char* inp;
 
+// Accumulate an integer.
+int acc_int(int c);
+
+// Accumulate a floating-point number.
+double acc_float(int c);
+
 // Called by `yyparse()` (in bison-generated files.)
 int yylex();
 void yyerror(char const* s);

src/include/token.h

@@ -1,39 +0,0 @@
-#ifndef TOKEN_H
-#define TOKEN_H
-
-#include <stdlib.h>
-
-typedef enum {
-    TOKEN_TYPE_CALL,
-    TOKEN_TYPE_NUMBER,
-    TOKEN_TYPE_MAX = TOKEN_TYPE_NUMBER,
-} TokenType;
-
-// Token.
-typedef struct {
-    TokenType type; // The type of the Token.
-    size_t valn;    // The length of val.
-    char* val;      // The text of the Token.
-    size_t len;     // Length of the text of the Token.
-} Token;
-
-Token* token_init(TokenType type, char* val, size_t valn);
-void token_destroy(Token* token);
-
-// Prints out a representation of the Token.
-void token_print(Token* token);
-
-// Prints out a representation of the Token, with the specified indent level.
-void token_print_i(Token* token, int ilevel);
-
-// Prints out a representation of the TokenType.
-void tokentype_print(TokenType t);
-
-// Prints out a representation of the TokenType, with the specified indent
-// level.
-void tokentype_print_i(TokenType t, int ilevel);
-
-// Prints a token's type. That's it.
-void tokentype_print_raw(TokenType t);
-
-#endif

src/include/util.h

@@ -50,7 +50,7 @@
 
 // Print & indent the title of a section.
 #define INDENT_TITLE(THING, WHERE)                                             \
-    printf("%s" COL_BCYA THING " @ %p\n" COL_RESET, INDENT_spacing->buf, WHERE);
+    printf("%s" COL_BCYA THING COL_RESET " @" COL_MAG " %p\n" COL_RESET, INDENT_spacing->buf, WHERE);
 
 // Print & indent a thing.
 #define INDENT_FIELD(FIELD, VAL, ...)                                          \
@@ -64,8 +64,8 @@
            INDENT_spacing->buf, INDENT_spacing->buf, __VA_ARGS__);
 
 // Print & indent a thing without any newline.
-#define INDENT_FIELD_NONL_START(FIELD)                                         \
-    printf("%s " COL_BWHI FIELD ": " COL_RESET COL_WHI, INDENT_spacing->buf);
+#define INDENT_FIELD_EXT_NONL_START(FIELD)                                         \
+    printf("%s " COL_BWHI FIELD ":\n" COL_RESET COL_WHI, INDENT_spacing->buf);
 #define INDENT_FIELD_NONL_END printf( "\n" COL_RESET);
 
 // Print an array A of N things, by calling the function F.

src/lexer.c

@@ -1,9 +1,52 @@
 #include <ctype.h>
 #include <limits.h>
+#include <math.h>
 #include <stdio.h>
 
 #include "include/lexer.h"
 
+int acc_int(int c) {
+    int value = c - '0';
+    while (isdigit(*inp)) {
+        value = value * 10 + (*inp - '0'); // Accumulate value.
+        inp++;
+    }
+    return value;
+}
+
+double acc_float(int c) {
+    int dplaces = 0;
+    double value = (double)(c - '0');
+
+    // Grab everything prior to '.'.
+    while (isdigit(*inp)) {
+        value = value * 10 + (*inp - '0'); // Accumulate value.
+        inp++;
+    }
+
+    if (*inp == '.') {
+        inp++;
+
+        while (isdigit(*inp)) {
+            // TODO:
+            // Accumulate as int, divide once at end.
+            // value = value + (((double)(*inp - '0'))/pow(10.0l,
+            // (double)(inp-oinp))); // Accumulate value.
+            value = value * 10 + (*inp - '0'); // Accumulate value.
+            dplaces++;
+            inp++;
+        }
+        value = value / pow(10, dplaces);
+    }
+
+    // > 1.20000
+    // = 1.0 + 2/10
+
+    // > 1.23
+    // = 1.2 + 3/100
+    return value;
+}
+
 int yylex() {
     if (*inp == '\0') return YYEOF;
 
@@ -15,12 +58,7 @@ int yylex() {
 
     // Check for NUM.
     if (isdigit(c)) {
-        int value = c - '0';
-        while (isdigit(*inp)) {
-            value = value * 10 + (*inp - '0'); // Accumulate value.
-            inp++;
-        }
-        yylval.intval = value; // Set the token value.
+        yylval.fval = acc_float(c); // Set the token value.
         return NUM;
     }
 
@@ -34,4 +72,4 @@ int yylex() {
 
     return 0;
 }
-void yyerror(char const* s) { fprintf(stderr, "Syntax error:\n%s\n", s); }
+void yyerror(char const* s) { fprintf(stderr, "Parse error: %s\n", s); }

src/main.c

@@ -2,9 +2,9 @@
 
 #include "include/ast.h"
 #include "include/dstr.h"
+#include "include/exec.h"
 #include "include/lexer.h"
 #include "include/util.h"
-#include "include/exec.h"
 
 #include "../build/grammars/grammar.tab.h"
 
@@ -31,7 +31,6 @@ int main(int argc, char** argv) {
             switch (c) {
                 case EOF:  dstr_destroy(ln); goto lnskip;
                 case '\n': goto lnend;
-
                 default:   dstr_appendch(ln, c); log_dbgf("cchar: %c", c);
             }
         } while (1);
@@ -41,14 +40,12 @@ int main(int argc, char** argv) {
         log_dbgf("cline: %s", ln->buf);
 
         if (ln->ln > 0) {
-            // I hope it's null-terminated.
             inp = ln->buf;
-            if (yyparse() == 0)
-                printf("Parsed successfully!\n");
-            else
-                printf("Parse error.\n");
+            if (yyparse() == 0) printf("Parsed successfully!\n");
+            else printf("Parse error.\n");
 
-            exec_expr();
+            exec_print(exec_expr(root));
+            ast_print(root);
         }
 
         dstr_destroy(ln);

src/stack.c

@@ -2,8 +2,8 @@
 #include <stdio.h>
 #include <string.h>
 
-#include "include/util.h"
 #include "include/stack.h"
+#include "include/util.h"
 
 Stack* stack_init() {
     talloc(Stack, stack);

src/token.c

@@ -1,62 +0,0 @@
-#include <stdio.h>
-
-#include "include/token.h"
-#include "include/dstr.h"
-#include "include/util.h"
-
-static char* tokentype_names[] = {
-    [TOKEN_TYPE_CALL] = "CALL",
-    [TOKEN_TYPE_NUMBER] = "NUMBER",
-};
-
-Token* token_init(TokenType type, char* val, size_t valn) {
-    Token* t = malloc(sizeof(Token));
-
-    t->type = type;
-    t->valn = valn;
-    t->val = val;
-
-    return t;
-}
-
-void token_destroy(Token* t) {
-    free(t->val);
-    free(t);
-}
-
-void token_print(Token* token) { token_print_i(token, 0); }
-
-void token_print_i(Token *token, int ilvl) {
-    INDENT_BEGIN(ilvl);
-
-    INDENT_TITLE("Token", token);
-    INDENT_FIELD_NONL_START("type")
-        tokentype_print_raw(token->type);
-    INDENT_FIELD_NONL_END
-    INDENT_FIELD("valn", "%ld", token->valn); 
-    INDENT_FIELD_NL("val", "\"%s\"", token->val);
-}
-
-void tokentype_print_raw(TokenType t) {
-    if (t > TOKEN_TYPE_MAX) {
-        printf("Unknown (%d)", t);
-        log_dbgf("%d is not a valid TokenType (max: %d)", t, TOKEN_TYPE_MAX);
-        return;
-    }
-
-    printf("%s", tokentype_names[t]);
-}
-
-void tokentype_print(TokenType t) { tokentype_print_i(t, 0); }
-
-void tokentype_print_i(TokenType t, int i) {
-    INDENT_BEGIN(i);
-
-    if (t > TOKEN_TYPE_MAX) {
-        INDENT_FIELD("val", "Unknown (%d)", t);
-        log_dbgf("%d is not a valid TokenType (max: %d)", t, TOKEN_TYPE_MAX);
-        return;
-    }
-
-    INDENT_FIELD("val", "%s", tokentype_names[t]);
-}