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Scarlett
2025-03-03 14:48:19 -05:00
parent 44ddfa41f8 d34a4d3a55
commit b22f0149c7
15 changed files with 595 additions and 231 deletions
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3
.gitignore vendored
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@ -6,4 +6,5 @@ grammar.tab.c
grammar.tab.h
.vscode
out
src
src
tmp

42
Makefile
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@ -1,25 +1,40 @@
CC := gcc
FLEX := flex
LEX := lexicalStructure.lex
LEX := src/lexicalStructure.lex
EXE := alpha
CFLAGS :=
YACC := bison
compiler: tmp/grammar.tab.c tmp/lex.yy.c tmp/runner.o tmp/symbol_table.o
$(CC) $(CFLAGS) -o $(EXE) tmp/runner.o tmp/lex.yy.c tmp/symbol_table.o
tmp/grammar.tab.c: src/grammar.y
mkdir -p tmp
$(YACC) -d src/grammar.y
mv grammar.tab.c tmp/
mv grammar.tab.h tmp/
tmp/lex.yy.c: src/lexicalStructure.lex
$(FLEX) -o tmp/lex.yy.c $(LEX)
mv flex.h tmp/
tmp/runner.o: src/runner.c src/runner.h tmp/flex.h
$(CC) $(CFLAGS) -o tmp/runner.o -c src/runner.c
tmp/symbol_table.o: src/symbol_table.c src/symbol_table.h
$(CC) $(CFLAGS) -o tmp/symbol_table.o -c src/symbol_table.c
parser : tmp/lex.yy.c tmp/grammar.tab.c
$(CC) -o parser tmp/lex.yy.c tmp/grammar.tab.c src/symbol_table.c
runner: tmp/lex.yy.c tmp/runner.o tmp/symbol_table.o
$(CC) $(CFLAGS) -o $(EXE) tmp/runner.o tmp/lex.yy.c tmp/symbol_table.o
compiler: lex.yy.c runner.o runner
lex.yy.c: lexicalStructure.lex
$(FLEX) -o lex.yy.c $(LEX)
runner.o: runner.c runner.h flex.h
$(CC) $(CFLAGS) -o runner.o -c runner.c
symbol.o: symbol_table.c symbol_table.h
$(CC) $(CFLAGS) -o symbol_table.o symbol_table.c
runner: lex.yy.c runner.o symbol_table.o
$(CC) $(CFLAGS) -o $(EXE) runner.o lex.yy.c symbol_table.o
bison: grammar.y
bison -d grammar.y
debug: CFLAGS += -DDEBUG=1
debug: clean compiler
@ -49,4 +64,5 @@ clean:
rm -f grammar.tab.c
rm -f grammar.tab.h
rm -f *.st
rm -rf out
rm -rf out
rm -rf tmp

64
grammar.y
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@ -1,64 +0,0 @@
/* Syntax Analyzer with Bison (3.8.1) */
/* (referenced Bison manual for file boilerplate [3.1]) */
// Prologue
%{
#include <stdio.h>
%}
%token ID 101
%token T_INTEGER 201
%token T_ADDRESS 202
%token T_BOOLEAN 203
%token T_CHARACTER 204
%token T_STRING 205
%token C_INTEGER 301
%token C_NULL 302
%token C_CHARACTER 303
%token C_STRING 304
%token C_TRUE 305
%token C_FALSE 306
%token WHILE 401
%token IF 402
%token THEN 403
%token ELSE 404
%token TYPE 405
%token FUNCTION 406
%token RETURN 407
%token EXTERNAL 408
%token AS 409
%token L_PAREN 501
%token R_PAREN 502
%token L_BRACKET 503
%token R_BRACKET 504
%token L_BRACE 505
%token R_BRACE 506
%token SEMI_COLON 507
%token COLON 508
%token COMMA 509
%token ARROW 510
%token ADD 601
%token SUB_OR_NEG 602
%token MUL 603
%token DIV 604
%token REM 605
%token LESS_THAN 606
%token EQUAL_TO 607
%token ASSIGN 608
%token NOT 609
%token AND 610
%token OR 611
%token DOT 612
%token RESERVE 613
%token RELEASE 614
%token COMMENT 700
%%
DBLOCK: %empty;
FUNCTION_DECLARATION: FUNCTION ID COLON ID
| EXTERNAL FUNCTION ID COLON ID
;
RECORD_DECLARATION: TYPE ID COLON DBLOCK;
ARRAY_DECLARATION: ID ASSIGN RESERVE ID L_PAREN C_INTEGER R_PAREN;
%%

279
src/grammar.y Normal file
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@ -0,0 +1,279 @@
/* Syntax Analyzer with Bison (3.8.1) */
/* (referenced Bison manual for file boilerplate [3.1]) */
// Prologue
%{
#include <stdio.h>
#include "symbol_table.c"
extern int yylex(void);
void yyerror(const char *err);
extern char* yytext;
extern int yychar;
SymbolTable * st;
//char* cur_value;
//char* cur_type;
int token_tracker;
extern int line_number;
extern int column_number;
%}
%union {
int integ;
char * words;
}
//precedence order
%precedence RESERVE
%precedence RELEASE
%precedence DOT
%precedence SUB_OR_NEG
%precedence NOT
%left MUL
%left DIV
%left REM
%left ADD
//need subtraction only here
%left LESS_THAN
%left EQUAL_TO
%left AND
%left OR
%left ASSIGN
%token <words> ID 101
%token T_INTEGER 201
%token T_ADDRESS 202
%token T_BOOLEAN 203
%token T_CHARACTER 204
%token T_STRING 205
%token C_INTEGER 301
%token C_NULL 302
%token C_CHARACTER 303
%token C_STRING 304
%token C_TRUE 305
%token C_FALSE 306
%token WHILE 401
%token IF 402
%token THEN 403
%token ELSE 404
%token TYPE 405
%token FUNCTION 406
%token RETURN 407
%token EXTERNAL 408
%token AS 409
%token L_PAREN 501
%token R_PAREN 502
%token L_BRACKET 503
%token R_BRACKET 504
%token L_BRACE 505
%token R_BRACE 506
%token SEMI_COLON 507
%token COLON 508
%token COMMA 509
%token ARROW 510
/* %token ADD 601
%token SUB_OR_NEG 602
%token MUL 603
%token DIV 604
%token REM 605
%token LESS_THAN 606
%token EQUAL_TO 607
%token ASSIGN 608
%token NOT 609
%token AND 610
%token OR 611
%token DOT 612
%token RESERVE 613
%token RELEASE 614 */
%token COMMENT 700
%%
program:
prototype_or_definition_list;
prototype_or_definition_list:
prototype prototype_or_definition_list
| definition prototype_or_definition_list
| prototype
| definition
;
prototype:
L_PAREN EXTERNAL R_PAREN FUNCTION ID COLON ID;
definition:
TYPE ID COLON dblock
| TYPE ID COLON constant ARROW ID
| TYPE ID COLON types ARROW ID
| FUNCTION ID COLON ID
| TYPE ID COLON ID ARROW ID
| ID parameter ASSIGN sblock
;
parameter:
L_PAREN ID R_PAREN
| AS L_PAREN idlist R_PAREN
;
idlist:
ID COMMA idlist
|ID
;
sblock:
L_BRACE {st = CreateScope(st,2,2);} statement_list {st = getParent(st);} R_BRACE
| L_BRACE {st = CreateScope(st,2,2);} dblock statement_list {st = getParent(st);} R_BRACE
;
dblock:
L_BRACKET declaration_list R_BRACKET;
declaration_list:
declaration
{printf(
"declaration list a rule encountered");
//CreateEntry(st,cur_type,cur_value);
}
SEMI_COLON declaration_list
| declaration
{printf(
"declaration rule b encountered");
//CreateEntry(st,cur_type,cur_value);
}
;
declaration:
ID COLON ID {
CreateEntry(st,strdup($1),strdup($3));
// printf("declaration rule encountered");
// if(cur_value != NULL){
// char* delete1 = cur_value;
// printf("delete1 var assigned to cur_value");
// free(delete1);
// printf("delete1 var freed");
// }
// if(cur_type != NULL){
// char* delete2 = cur_type;
// free(delete2);}
// int len = strlen($1);
// printf("length determined");
// cur_value = malloc(len + 1);
// printf("space allocated");
// strcpy(cur_value, $1);
// printf("string copied over");
// len = strlen($3);
// cur_type = malloc(len + 1);
// strcpy(cur_type, $3);
// printf("value var is %s type var is %s\n",cur_value,cur_type);
}
| types COLON ID
;
statement_list:
compound_statement statement_list
| compound_statement
| simple_statement SEMI_COLON statement_list
| simple_statement SEMI_COLON
;
compound_statement:
WHILE L_PAREN expression R_PAREN sblock
| IF L_PAREN expression R_PAREN THEN sblock ELSE sblock
| sblock
;
simple_statement:
assignable ASSIGN expression
| RETURN expression
;
assignable:
ID
| assignable ablock
| assignable DOT ID
;
expression:
constant
| UnaryOperator expression
| assignable
| constant binaryOperator expression
| L_PAREN expression R_PAREN
| memOp assignable
;
ablock:
L_PAREN argument_list R_PAREN;
argument_list:
expression COMMA argument_list
| expression
;
UnaryOperator:
SUB_OR_NEG
| NOT
;
memOp:
RESERVE
| RELEASE
;
binaryOperator:
ADD
| SUB_OR_NEG
| MUL
| DIV
| REM
| AND
| OR
| LESS_THAN
| EQUAL_TO
;
constant:
C_STRING
| C_INTEGER
| C_NULL
| C_CHARACTER
| C_TRUE
| C_FALSE
;
types:
T_STRING
| T_INTEGER
| T_ADDRESS
| T_CHARACTER
| T_BOOLEAN
;
//
%%
void yyerror(const char *err) {
// fprintf(stderr, "ERROR: %s at token %s at line number %d,column number %d\n", err,yytext,line_number,column_number);
}
int main() {
//char *str = strdup("taco");
//cur_value = NULL;
//cur_type = NULL;
token_tracker = 1;
st=CreateScope(NULL,1,1);
//int a;
yyparse();
//while ((a = yyparse() != EOF){
// token_tracker++;
//printf("%d = a: yytext = %s: yychar = %d, token number: %d\n", a, yytext, yychar,token_tracker);
//if(yytext[0] == '\n'){
FILE* f = fdopen(1,"w");
print_symbol_table(getAncestor(st),f);
fclose(f);
// break;
//}
//}
return 0;
}

7
lexicalStructure.lex → src/lexicalStructure.lex
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@ -6,11 +6,14 @@
%option header-file="flex.h"
%{
#include <stdbool.h>
#include "typedefs.h"
//#include "typedefs.h"
#include "grammar.tab.h"
int line_number = 1, column_number = 1;
#ifndef DEBUG
#define DEBUG 0
#endif
%}
STARCOM [^\*]|\*+[^\)\*]+
@ -78,7 +81,7 @@ SCHAR \\n|\\t|\\\"|[^\"\n\\]
"false" {if(DEBUG) {printf( "C_FALSE: %s (%d)\n", yytext, C_FALSE);} else {return C_FALSE;}}
"null" {if(DEBUG) {printf( "C_NULL: %s (%d)\n", yytext, C_NULL);} else {return C_NULL;}}
{ID} {if(DEBUG) {printf( "ID: %s (%d)\n", yytext, ID);} else {return ID;}}
{ID} {if(DEBUG) {printf( "ID: %s (%d)\n", yytext, ID);} else {yylval.words = strdup(yytext); return ID;}}
\n {line_number++; column_number = 1;}
\t {column_number++;}

3
runner.c → src/runner.c
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@ -81,7 +81,8 @@ int run(FILE *alpha) {
}
if(token == 1999){
printf("On line number %d and column number %d we have an invalid character:%s\n",line_number,column_number,yytext);
}
//return -1;
}
column_number += yyleng;
}

2
runner.h → src/runner.h
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@ -8,7 +8,7 @@
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include "flex.h"
#include "../tmp/flex.h"
#include "typedefs.h"
#include <stdbool.h>
#include "symbol_table.h"

145
src/symbol_table.c Normal file
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@ -0,0 +1,145 @@
#include "symbol_table.h"
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
SymbolTable* CreateScope(SymbolTable* ParentScope, int Line, int Column) {
SymbolTable* table = (SymbolTable*)malloc(sizeof(SymbolTable));
table->Line_Number = Line;
table->Column_Number = Column;
table->Parent_Scope = ParentScope;
table->Children_Scope = NULL;
table->entries = NULL;
if (ParentScope != NULL) {
if (ParentScope->Children_Scope == NULL) {
ListOfTable* newEntry = (ListOfTable*)malloc(sizeof(ListOfTable));
newEntry->next = NULL;
// newEntry->prev = NULL;
newEntry->table = table;
ParentScope->Children_Scope = newEntry;
} else {
ListOfTable* newEntry = (ListOfTable*)malloc(sizeof(ListOfTable));
// newEntry->prev = NULL;
newEntry->table = table;
ListOfTable* oldEntry = ParentScope->Children_Scope;
ParentScope->Children_Scope = newEntry;
newEntry->next = oldEntry;
}
}
return table;
}
TableNode* CreateEntry(SymbolTable* table, char* typeOf, char* id) {
TableNode* newEntry = (TableNode*)malloc(sizeof(TableNode));
newEntry->theType = typeOf;
newEntry->theName = id;
if (table->entries == NULL) {
table->entries = newEntry;
return newEntry;
} else {
TableNode* oldEntry = table->entries;
table->entries = newEntry;
newEntry->next = oldEntry;
return newEntry;
}
}
TableNode* table_lookup(SymbolTable* table, char* x) {
TableNode* entrie = table->entries;
for (; entrie != NULL; entrie = entrie->next) {
if (!strcmp(entrie->theName, x)) {
return entrie;
}
}
return NULL;
}
TableNode* look_up(SymbolTable* table, char* x) {
if (table == NULL) {
return NULL;
}
TableNode* ret = table_lookup(table, x);
if (ret != NULL) {
return ret;
}
return look_up(table->Parent_Scope, x);
}
void print_symbol_table(SymbolTable* table, FILE* file_ptr) {
if (table->Parent_Scope == NULL) {
fprintf(file_ptr, "%-17s: %-6s : %-6s : %-21s: %-28s\n", "NAME", "SCOPE",
"PARENT", "TYPE", "Extra annotation");
}
TableNode* entrie = table->entries;
fprintf(file_ptr,
"-----------------:--------:--------:----------------------:---------"
"--------------------\n");
int parant_scope = 0;
int current_scope = 0;
if (table->Parent_Scope != NULL) {
parant_scope = table->Parent_Scope->Line_Number * 1000 +
table->Parent_Scope->Column_Number;
current_scope = table->Line_Number * 1000 + table->Column_Number;
} else {
current_scope = 1001;
}
for (; entrie != NULL; entrie = entrie->next) {
if (parant_scope == 0) {
fprintf(file_ptr, "%-17s: %06d : : %-21s: %-28s\n",
entrie->theName, current_scope, entrie->theType,
"Extra annotation");
} else {
fprintf(file_ptr, "%-17s: %06d : %06d : %-21s: %-28s\n", entrie->theName,
current_scope, parant_scope, entrie->theType, "Extra annotation");
}
}
if (table->Children_Scope != NULL) {
ListOfTable* node = table->Children_Scope;
for (; node != NULL; node = node->next) {
print_symbol_table(node->table, file_ptr);
}
}
if (table->Parent_Scope == NULL) {
fprintf(file_ptr,
"-----------------:--------:--------:----------------------:-------"
"----------------------\n");
}
}
SymbolTable* getAncestor(SymbolTable* table) {
if (table->Parent_Scope == NULL) {
// if table has no parent, return itself
return table;
} else {
// call function recursively to grab ancestor
return getAncestor(table->Parent_Scope);
}
}
SymbolTable* getParent(SymbolTable* st) { return st->Parent_Scope; }
ListOfTable* getChildren(SymbolTable* st) { return st->Children_Scope; }
SymbolTable* getFirstChild(ListOfTable* lt) { return lt->table; }
ListOfTable* getRestOfChildren(ListOfTable* lt) { return lt->next; }
TableNode* getFirstEntry(SymbolTable* st) { return st->entries; }
TableNode* getNextEntry(TableNode* tn) { return tn->next; }
char* getType(TableNode* tn) { return tn->theType; }
char* getName(TableNode* tn) { return tn->theName; }
int getLine(SymbolTable* st) { return st->Line_Number; }
int getColumn(SymbolTable* st) { return st->Column_Number; }
// uncomment the below main function along with the headers above for a simple
// standalone test of table and entry creation
/*
int main(){
char* String = "STRING";
char* X = "X";
SymbolTable* Second = CreateScope(NULL, 2,2);
printf("Line number is %d, Column number of scope is
%d\n",Second->Line_Number,Second->Column_Number); TableNode* First_Entry =
CreateEntry(Second,String,X);
printf("The type of the first entry is %s\n",First_Entry->theType);
return 0;
}
*/

43
src/symbol_table.h Normal file
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@ -0,0 +1,43 @@
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
typedef struct ListOfTable {
struct SymbolTable* table;
// struct ListOfTable* prev;
struct ListOfTable* next;
} ListOfTable;
typedef struct TableNode {
char* theType;
char* theName;
struct TableNode* next;
} TableNode;
typedef struct SymbolTable {
TableNode* entries;
struct SymbolTable* Parent_Scope;
struct ListOfTable* Children_Scope;
int Line_Number;
int Column_Number;
} SymbolTable;
SymbolTable* CreateScope(SymbolTable* ParentScope, int Line, int Column);
TableNode* CreateEntry(SymbolTable* table, char* typeOf, char* id);
TableNode* table_lookup(SymbolTable* table, char* x);
TableNode* look_up(SymbolTable* table, char* x);
void print_symbol_table(SymbolTable* table, FILE* file_ptr);
SymbolTable* getAncestor(SymbolTable* table);
SymbolTable* getParent(SymbolTable* st);
ListOfTable* getChildren(SymbolTable* st);
SymbolTable* getFirstChild(ListOfTable* lt);
ListOfTable* getRestOfChildren(ListOfTable* lt);
TableNode* getFirstEntry(SymbolTable* st);
TableNode* getNextEntry(TableNode* tn);
char* getType(TableNode* tn);
char* getName(TableNode* tn);
int getLine(SymbolTable* st);
int getColumn(SymbolTable* st);

0
typedefs.h → src/typedefs.h
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117
symbol_table.c
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@ -1,117 +0,0 @@
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include "symbol_table.h"
SymbolTable* CreateScope(SymbolTable* ParentScope, int Line, int Column){
SymbolTable* table = (SymbolTable*)malloc(sizeof(SymbolTable));
table->Line_Number = Line;
table->Column_Number = Column;
table->Parent_Scope = ParentScope;
table->Children_Scope = NULL;
table->entries = NULL;
if(ParentScope != NULL){
if(ParentScope->Children_Scope == NULL){
ListOfTable* newEntry = (ListOfTable*)malloc(sizeof(ListOfTable));
newEntry->next = NULL;
//newEntry->prev = NULL;
newEntry->table = table;
ParentScope->Children_Scope = newEntry;
} else{
ListOfTable* newEntry = (ListOfTable*)malloc(sizeof(ListOfTable));
//newEntry->prev = NULL;
newEntry->table= table;
ListOfTable* oldEntry = ParentScope->Children_Scope;
ParentScope->Children_Scope = newEntry;
newEntry->next = oldEntry;
}
}
return table;
}
TableNode* CreateEntry(SymbolTable* table, char* typeOf, char* id){
TableNode* newEntry = (TableNode*)malloc(sizeof(TableNode));
newEntry->theType = typeOf;
newEntry->theName = id;
if(table->entries == NULL){
table->entries = newEntry;
return newEntry;
} else{
TableNode* oldEntry = table->entries;
table->entries = newEntry;
newEntry->next = oldEntry;
return newEntry;
}
}
TableNode * table_lookup(SymbolTable * table, char * x){
TableNode * entrie = table->entries;
for(; entrie != NULL; entrie = entrie->next){
if (!strcmp(entrie->theName, x)){
return entrie;
}
}
return NULL;
}
TableNode * look_up(SymbolTable * table, char * x){
if(table == NULL){
return NULL;
}
TableNode * ret = table_lookup(table, x);
if (ret != NULL){
return ret;
}
return look_up(table->Parent_Scope, x);
}
void print_symbol_table(SymbolTable *table, FILE *file_ptr){
if(table->Parent_Scope == NULL){
fprintf(file_ptr, "%-17s: %-6s : %-6s : %-21s: %-28s\n", "NAME", "SCOPE", "PARENT", "TYPE", "Extra annotation");
}
TableNode * entrie = table->entries;
fprintf(file_ptr, "-----------------:--------:--------:----------------------:-----------------------------\n");
int parant_scope = 0;
int current_scope = 0;
if(table->Parent_Scope != NULL){
parant_scope = table->Parent_Scope->Line_Number*1000 + table->Parent_Scope->Column_Number;
current_scope = table->Line_Number*1000 + table->Column_Number;
} else {
current_scope = 1001;
}
for(; entrie != NULL; entrie = entrie->next){
if (parant_scope == 0){
fprintf(file_ptr, "%-17s: %06d : : %-21s: %-28s\n",
entrie->theName, current_scope,
entrie->theType, "Extra annotation");
} else {
fprintf(file_ptr, "%-17s: %06d : %06d : %-21s: %-28s\n",
entrie->theName, current_scope, parant_scope,
entrie->theType, "Extra annotation");
}
}
if (table->Children_Scope != NULL){
ListOfTable* node = table->Children_Scope;
for(; node != NULL; node = node->next){
print_symbol_table(node->table, file_ptr);
}
}
if (table->Parent_Scope == NULL) {
fprintf(file_ptr, "-----------------:--------:--------:----------------------:-----------------------------\n");
}
}
//uncomment the below main function along with the headers above for a simple standalone test of table and entry creation
/*
int main(){
char* String = "STRING";
char* X = "X";
SymbolTable* Second = CreateScope(NULL, 2,2);
printf("Line number is %d, Column number of scope is %d\n",Second->Line_Number,Second->Column_Number);
TableNode* First_Entry = CreateEntry(Second,String,X);
printf("The type of the first entry is %s\n",First_Entry->theType);
return 0;
}
*/

32
symbol_table.h
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@ -1,32 +0,0 @@
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
typedef struct ListOfTable{
struct SymbolTable* table;
//struct ListOfTable* prev;
struct ListOfTable* next;
}ListOfTable;
typedef struct TableNode{
char* theType;
char* theName;
struct TableNode* next;
}TableNode;
typedef struct SymbolTable{
TableNode* entries;
struct SymbolTable* Parent_Scope;
struct ListOfTable* Children_Scope;
int Line_Number;
int Column_Number;
}SymbolTable;
TableNode* CreateEntry(SymbolTable* table, char* typeOf, char* id);
SymbolTable* CreateScope(SymbolTable* ParentScope, int Line, int Column);
TableNode * table_lookup(SymbolTable * table, char * x);
TableNode * look_up(SymbolTable * table, char * x);
void print_symbol_table(SymbolTable *table, FILE *file_ptr);

48
tests/sprint2/other/calc.h Normal file
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@ -0,0 +1,48 @@
/* Function type. */
typedef double (func_t) (double);
/* Data type for links in the chain of symbols. */
struct symrec
{
char *name; /* name of symbol */
int type; /* type of symbol: either VAR or FUN */
union
{
double var; /* value of a VAR */
func_t *fun; /* value of a FUN */
} value;
struct symrec *next; /* link field */
};
typedef struct symrec symrec;
/* The symbol table: a chain of 'struct symrec'. */
extern symrec *sym_table;
symrec *putsym (char const *name, int sym_type);
symrec *getsym (char const *name);
struct init
{
char const *name;
func_t *fun;
};
struct init const funs[] =
{
{ "atan", atan },
{ "cos", cos },
{ "exp", exp },
{ "ln", log },
{ "sin", sin },
{ "sqrt", sqrt },
{ 0, 0 },
};
/* The symbol table: a chain of 'struct symrec'. */
symrec *sym_table;
/* Put functions in table. */
static void
init_table (void)
{
for (int i = 0; funs[i].name; i++)
{
symrec *ptr = putsym (funs[i].name, FUN);
ptr->value.fun = funs[i].fun;
}
}

0
test.c → tests/sprint2/other/test.c
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41
tests/sprint2/other/testGrammar.y Normal file
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@ -0,0 +1,41 @@
%{
#include <stdio.h> /* For printf, etc. */
#include <math.h> /* For pow, used in the grammar. */
#include "calc.h" /* Contains definition of 'symrec'. */
int yylex (void);
void yyerror (char const *);
%}
%define api.value.type union /* Generate YYSTYPE from these types: */
%token <double> NUM /* Double precision number. */
%token <symrec*> VAR FUN /* Symbol table pointer: variable/function. */
%nterm <double> exp
%precedence '='
%left '-' '+'
%left '*' '/'
%precedence NEG /* negation--unary minus */
%right '^' /* exponentiation */
%% /* The grammar follows. */
input:
%empty
| input line
;
line:
'\n'
| exp '\n' { printf ("%.10g\n", $1); }
| error '\n' { yyerrok; }
;
exp:
NUM
| VAR { $$ = $1->value.var; }
| VAR '=' exp { $$ = $3; $1->value.var = $3; }
| FUN '(' exp ')' { $$ = $1->value.fun ($3); }
| exp '+' exp { $$ = $1 + $3; }
| exp '-' exp { $$ = $1 - $3; }
| exp '*' exp { $$ = $1 * $3; }
| exp '/' exp { $$ = $1 / $3; }
| '-' exp %prec NEG { $$ = -$2; }
| exp '^' exp { $$ = pow ($1, $3); }
| '(' exp ')' { $$ = $2; }
;
/* End of grammar. */
%%