feat: REPL environment

README.md

@@ -17,47 +17,50 @@ I didn't really study how others languages works beforehand, I'm just guessing h
 
 ToDo List:
 
-- [X] pow operator
-- [X] binary operators
-- [X] implement basic math functions
-- [X] implement random_int(min, max)
-- [X] implement print_number(message)
-- [X] add unit tests
-- [X] allow to set variables
-- [X] read line comments
-- [X] add modulus operator '%'
-- [X] add input_number() std function
-- [X] add NULL type (dirty way to handle no returns and some errors)
-- [X] add type() std function and others type checking functions
-- [X] add ceil() and floor() std functions
-- [X] base of the CLI
-- [X] read a file
-- [X] if statements
-- [X] while statements (with break and continue)
+- [X] feat: pow operator
+- [X] feat: binary operators
+- [X] feat: basic math functions
+- [X] feat: random_int(min, max)
+- [X] feat: print_number(message)
+- [X] base of unit tests
+- [X] feat: set variables
+- [X] feat: read line comments
+- [X] feat: modulus operator '%'
+- [X] feat: input_number() std function
+- [X] feat: NULL type (dirty way to handle no returns and some errors)
+- [X] feat: type() std function and others type checking functions
+- [X] feat: ceil() and floor() std functions
+- [X] feat: base of the CLI
+- [X] feat: process from a file
+- [X] feat: if statements
+- [X] feat: while statements (with break and continue)
 
-- [ ] add multiple characters operators
-- [ ] add inclusive operators like '!=', '>=', '<='
-- [ ] add functions support
-- [ ] add priority operators
-- [ ] add multiline expressions
-- [ ] add short hand if without 'end'
-- [ ] add repeat statement
-- [ ] add static string support (just for ui)
-- [ ] add print_string function
-- [ ] add basic number list support
-- [ ] add fully features strings support
-- [ ] add function to access to environment variables
+- [ ] feat(Evaluator): multiple characters operators
+- [ ] feat(Evaluator): inclusive operators like '!=', '>=', '<='
+- [ ] feat: functions support
+- [ ] feat(Evaluator): priority operators
+- [ ] feat: multiline expressions
+- [ ] feat: short hand if statement without 'end'
+- [ ] feat: repeat statement
+- [ ] feat: static string support (just for ui)
+- [ ] feat: print_string function
+- [ ] feat: basic number list support
+- [ ] feat: fully features strings support
+- [ ] feat: function to access to environment variables
 
-- [ ] add REPL environment
+- [X] feat: REPL environment
+- [ ] feat: add history to REPL
 - [ ] evaluate expression from stdin
-- [X] add config header file
+- [X] feat: config header file
 - [X] ability to modify keywords and customize the lang
-- [ ] add more config options
+- [ ] more config options
 
 - [ ] add [classic problem solving](https://rosettacode.org) with code examples
-- [ ] add Web Assembly support and publish a demo website
+- [ ] feat: web Assembly support and publish a demo website
 
-- [ ] refactor: use malloc for list
+- [ ] refactor: add 'Literal' struct with type and data
+- [ ] refactor(Evaluator): if branching around token identification
+- [ ] refactor(List): use malloc
 - [ ] refactor: remove inconsistency on how functions returns error codes
 
 ## Installation

sandbox.c

@@ -12,6 +12,11 @@
 int main () {
     struct VariableStore* store = var_store_init();
     printf("%d", var_store_hash_name(store, "print_number index"));
+
+    int i = -1;
+    if (i < 0) {
+        printf("lol jpp \n");
+    }
     
     return 0;
     //struct List l1;

src/config.h

@@ -13,6 +13,7 @@
 
 #if SYNTAX_PRESET == PRESET_ENGLISH
     #define SYNTAX_END "end"
+    #define SYNTAX_EXIT "exit"
 
     #define SYNTAX_SET_START "set"
     #define SYNTAX_SET_STOP "to"
@@ -29,6 +30,7 @@
 
 #if SYNTAX_PRESET == PRESET_FRENCH
     #define SYNTAX_END "fin"
+    #define SYNTAX_EXIT "sortir"
 
     #define SYNTAX_SET_START "definir"
     #define SYNTAX_SET_STOP "comme"

src/evaluator.c

@@ -532,6 +532,7 @@ int evaluate(struct StateContainer* state, char* inputStr, int* resultPtr, unsig
             }
         }
 
+        // FIXME: refactor to better branching
         if (st != 0) {
             // identify token
             // first try a variable then a func name

src/line_processing.c

@@ -309,34 +309,12 @@ int process_line(struct StateContainer* state, char* str)
 {
     if (LINE_PROCESSING_DEBUG_LEVEL >= 1) printf("\n ======= PROCESSING LINE '%s' =======\n", str);
     if (LINE_PROCESSING_DEBUG_LEVEL >= 2) printf("skipping: %d, blockStackLen: %d \n", state->skipping, state->blockStack->length);
-    // process 
+
+    state->lastEvaluationType = TYPE_NULL;
+    state->lastEvaluationResult = 0;
+
     int len = strlen(str);
-    // int startPos = 0;
-    // int stopPos = len-1;
-    // // modifiy the start and stop pos to trim spaces
-    // int startTrimOffset = 0;
-    // int stopTrimOffset = 0;
-    // for (int z = 0; z < len; z++) {
-    //     if (inputStr[startPos+z] != ' ') {
-    //         break;
-    //     }
-    //     startTrimOffset++;
-    // }
-    // for (int z = 1; z < len; z++) {
-    //     if (inputStr[stopPos-z] != ' ') {
-    //         break;
-    //     }
-    //     stopTrimOffset++;
-    // }
-    // startPos += startTrimOffset;
-    // stopPos -= stopTrimOffset;
 
-    // check for comment
-    // if (str[startPos] == '#') {
-    //     return;
-    // }
-
-    //int stat = 0;
     if (recognize_comment_statement(str)) {
         if (LINE_PROCESSING_DEBUG_LEVEL >= 2) printf("Comment recognized \n");
         state->linePtr++;
@@ -448,6 +426,12 @@ int process_line(struct StateContainer* state, char* str)
         return 1;
     }
 
+    if (recognize_word(str, SYNTAX_EXIT)) {
+        // exit the whole script
+        state->running = 0;
+        return 1;
+    }
+
     if (recognize_word(str, SYNTAX_CONTINUE)) {
         int lastLoopLine;
         if (!int_stack_pop(state->loopStack, &lastLoopLine)) {
@@ -468,6 +452,7 @@ int process_line(struct StateContainer* state, char* str)
 
         return 1;
     }
+
     if (recognize_word(str, SYNTAX_BREAK)) {
         int lastLoopLine;
         if (!int_stack_pop(state->loopStack, &lastLoopLine)) {
@@ -527,7 +512,7 @@ int process_line(struct StateContainer* state, char* str)
         return 1;
     }
 
-    // we evaluate but we dont care about the result
+    // we evaluate the expression and we register it in the state in case of a REPL that want to get the result of the expression
     int res;
     byte resType;
     int evalStat = evaluate(state, str, &res, &resType);
@@ -535,6 +520,9 @@ int process_line(struct StateContainer* state, char* str)
         printf("Error: could not evaluate expression \"%s\".\n", str);
         return 0;
     }
+
+    state->lastEvaluationType = resType;
+    state->lastEvaluationResult = res;
     state->linePtr++;
     return 1;
 }

src/main.c

@@ -1,5 +1,8 @@
+#include <assert.h>
 #include <stdlib.h>
 #include <stdio.h>
+#include <errno.h>
+#include <signal.h>
 #include <string.h>
 #include "./config.h"
 #include "./types.h"
@@ -12,6 +15,11 @@
 #include "./var_store.h"
 #include "./line_processing.h"
 
+/**
+This is the binding of the interpreter to a CLI
+The interpreter should be uncoupled from the rest of the code
+*/
+
 #define HELP_FLAG        1
 #define VERSION_FLAG     4
 #define INTERACTIVE_FLAG 8
@@ -34,8 +42,36 @@ int version_mode() {
 }
 
 int interactive_mode() {
-    printf("Interactive not implemented yet ¯\\_(ツ)_/¯ \n");
-    return 1;
+    struct StateContainer* state = state_init();
+
+    while (state->running) {
+        printf("? ");
+
+        char* line;
+        size_t len = 0;
+        size_t lineSize = 0;
+
+        lineSize = getline(&line, &len, stdin);
+        if (lineSize == (size_t) -1) {
+            // we received some kind of interrupt?
+            printf("\n");
+            return EXIT_SUCCESS;
+        }
+
+        char toEvaluate[lineSize+1];
+        // remove the new line at the end
+        str_extract((char*) toEvaluate, line, 0, lineSize-1);
+
+        int stat = process_line(state, toEvaluate);
+        if (!stat) {
+            printf("Processing that line failed.\n");
+        }
+        if (state->lastEvaluationType != TYPE_NULL) {
+            printf("%s\n", get_repr(state->lastEvaluationType, &state->lastEvaluationResult));
+        }
+    }
+
+    return EXIT_SUCCESS;
 }
 
 int stdin_expression_mode() {
@@ -43,31 +79,56 @@ int stdin_expression_mode() {
     return 1;
 }
 
-int file_mode(char* fileName) {
-    FILE* f = fopen(fileName, "rb");
 
-    if (!f) {
-        fprintf(stderr, "Cannot load file '%s' status: %d\n", fileName, (int) f);
-        return 1;
-    }
-    fseek(f, 0, SEEK_END);
-    long length = ftell(f);
-    fseek(f, 0, SEEK_SET);
+char* slurp_file(char* filePath, size_t* size) {
+    char* buffer = NULL;
+
+    FILE* f = fopen(filePath, "rb");
+    if (f == NULL) goto error;
+
+    if (fseek(f, 0, SEEK_END) < 0) goto error;
+
+    long m = ftell(f);
+    if (m < 0) goto error;
+
+    buffer = malloc(sizeof(char) * m);
+    if (buffer == NULL) goto error;
+
+    if (fseek(f, 0, SEEK_SET) < 0) goto error;
+
+    size_t n = fread(buffer, 1, m, f);
+    assert(n == (size_t) m);
+
+    if (ferror(f)) goto error;
+
+    if (size) *size = n;
 
-    char* buff = (char*) malloc(length);
-    if (!buff) {
-        fprintf(stderr, "Could not allocate buffer to process file content\n");
-        return 1;
-    }
-    if (buff) {
-        fread(buff, 1, length, f);
-    }
     fclose(f);
-    
+
+    return buffer;
+
+error:
+    if (f) fclose(f);
+
+    if (buffer) free(buffer);
+
+    return NULL;
+}
+
+int file_mode(char* fileName) {
+    // printf("Open file mode...\n");
+    size_t size;
+    char* buff = slurp_file(fileName, &size);
+
+    if (!buff) {
+        fprintf(stderr, "Error: Cannot load file '%s' errno: %d '%s'.\n", fileName, errno, strerror(errno));
+        return EXIT_FAILURE;
+    }
+
     struct StateContainer* state = state_init();
     process_script(state, buff);
 
-    return 0;
+    return EXIT_SUCCESS;
 }
 
 int main (int argc, char** argv) {
@@ -97,7 +158,7 @@ int main (int argc, char** argv) {
         // no flag match
         if (str_starts_with("--", argv[i])) {
             fprintf(stderr, "Invalid flag '%s'\n", argv[i]);
-            return 1;
+            return EXIT_FAILURE;
         }
         nonFlagArgumentCount++;
         nonFlagArgumentPos = i;
@@ -110,5 +171,5 @@ int main (int argc, char** argv) {
     if (flags & STDIN_EXP_FLAG) return stdin_expression_mode();
 
     help_mode(cmdName);
-    return 1;
+    return EXIT_FAILURE;
 }

src/state.c

@@ -18,5 +18,8 @@ struct StateContainer* state_init()
 
     ptr->running = 1;
 
+    ptr->lastEvaluationType = TYPE_NULL;
+    ptr->lastEvaluationResult = 0;
+
     return ptr;
 }

src/state.h

@@ -32,6 +32,9 @@ struct StateContainer {
     
     // struct FunctionStore* funcStore;
     // struct StringStore* strStore ??
+
+    int lastEvaluationResult;
+    byte lastEvaluationType;
 };
 
 struct StateContainer* state_init();