#include <stdlib.h>
#include <stdio.h>
#include <spiderscript.h>
+#define WANT_TOKEN_STRINGS 1
#include "tokens.h"
#include "ast.h"
+#define DEBUG 0
+
// === PROTOTYPES ===
tAST_Script *Parse_Buffer(tSpiderVariant *Variant, char *Buffer);
tAST_Node *Parse_DoCodeBlock(tParser *Parser);
-tAST_Node *Parse_DoExpr(tParser *Parser);
+tAST_Node *Parse_DoBlockLine(tParser *Parser);
+tAST_Node *Parse_GetVarDef(tParser *Parser, int Type);
tAST_Node *Parse_DoExpr0(tParser *Parser); // Assignment
tAST_Node *Parse_DoExpr1(tParser *Parser); // Boolean Operators
tAST_Node *Parse_GetVariable(tParser *Parser);
tAST_Node *Parse_GetIdent(tParser *Parser);
-void SyntaxAssert(int Have, int Want);
+void SyntaxAssert(tParser *Parser, int Have, int Want);
// === CODE ===
/**
tAST_Node *mainCode;
char *name;
tAST_Function *fcn;
+ int type;
+
+ #if DEBUG >= 2
+ printf("Parse_Buffer: (Variant=%p, Buffer=%p)\n", Variant, Buffer);
+ #endif
// Initialise parser
+ parser.LastToken = -1;
+ parser.NextToken = -1;
+ parser.CurLine = 1;
parser.BufStart = Buffer;
parser.CurPos = Buffer;
ret = AST_NewScript();
mainCode = AST_NewCodeBlock();
- for(;;)
+ if( setjmp( parser.JmpTarget ) != 0 )
+ {
+ AST_FreeNode( mainCode );
+ return NULL;
+ }
+
+ while(Parser->Token != TOK_EOF)
{
switch( GetToken(Parser) )
{
- case TOK_RWD_FUNCTION:
- // Define a function
- SyntaxAssert( GetToken(Parser), TOK_IDENT );
+ case TOK_EOF:
+ break;
+
+ // Typed variables/functions
+ case TOKEN_GROUP_TYPES:
+ {
+ int tok, type;
+ TOKEN_GET_DATATYPE(type, Parser->Token);
+
+ tok = GetToken(Parser);
+ // Define a function (pass on to the other function definition code)
+ if( tok == TOK_IDENT ) {
+ goto defFcn;
+ }
+ // Define a variable
+ else if( tok == TOK_VARIABLE ) {
+ AST_AppendNode( mainCode, Parse_GetVarDef(Parser, type) );
+ SyntaxAssert(Parser, GetToken(Parser), TOK_SEMICOLON);
+ }
+ else {
+ fprintf(stderr, "ERROR: Unexpected %s, expected TOK_IDENT or TOK_VARIABLE\n",
+ csaTOKEN_NAMES[tok]);
+ }
+ }
+ break;
+
+ // Define a function
+ case TOK_RWD_FUNCTION:
+ if( !Variant->bDyamicTyped ) {
+ fprintf(stderr, "ERROR: Attempt to create a dynamic function\n");
+ longjmp(Parser->JmpTarget, -1);
+ }
+ type = SS_DATATYPE_DYNAMIC;
+ SyntaxAssert(Parser, GetToken(Parser), TOK_IDENT );
+ defFcn:
name = strndup( Parser->TokenStr, Parser->TokenLen );
fcn = AST_AppendFunction( ret, name );
+ #if DEBUG
+ printf("DefFCN %s\n", name);
+ #endif
free(name);
- SyntaxAssert( GetToken(Parser), TOK_PAREN_OPEN );
- // TODO: Arguments
- SyntaxAssert( GetToken(Parser), TOK_PAREN_CLOSE );
+ // Get arguments
+ SyntaxAssert(Parser, GetToken(Parser), TOK_PAREN_OPEN );
+ if( LookAhead(Parser) != TOK_PAREN_CLOSE )
+ {
+ do {
+ type = SS_DATATYPE_DYNAMIC;
+ GetToken(Parser);
+ // Non dynamic typed variants must use data types
+ if( !Variant->bDyamicTyped ) {
+ TOKEN_GET_DATATYPE(type, Parser->Token);
+ GetToken(Parser);
+ }
+ AST_AppendFunctionArg(fcn, Parse_GetVarDef(Parser, type));
+ } while(GetToken(Parser) == TOK_COMMA);
+ }
+ else
+ GetToken(Parser);
+ SyntaxAssert(Parser, Parser->Token, TOK_PAREN_CLOSE );
AST_SetFunctionCode( fcn, Parse_DoCodeBlock(Parser) );
break;
default:
- PutBack(&parser);
- AST_AppendNode( mainCode, Parse_DoExpr(Parser) );
+ PutBack(Parser);
+ AST_AppendNode( mainCode, Parse_DoBlockLine(Parser) );
break;
}
}
fcn = AST_AppendFunction( ret, "" );
AST_SetFunctionCode( fcn, mainCode );
+ printf("---- %p parsed as SpiderScript ----\n", Buffer);
+
return ret;
}
tAST_Node *Parse_DoCodeBlock(tParser *Parser)
{
tAST_Node *ret;
- SyntaxAssert( GetToken(Parser), TOK_BRACE_OPEN );
+ SyntaxAssert(Parser, GetToken(Parser), TOK_BRACE_OPEN );
ret = AST_NewCodeBlock();
- while( GetToken(Parser) != TOK_BRACE_CLOSE )
+ while( LookAhead(Parser) != TOK_BRACE_CLOSE )
+ {
+ AST_AppendNode( ret, Parse_DoBlockLine(Parser) );
+ }
+ GetToken(Parser); // Omnomnom
+ return ret;
+}
+
+/**
+ * \brief Parse a line in a block
+ */
+tAST_Node *Parse_DoBlockLine(tParser *Parser)
+{
+ tAST_Node *ret;
+
+ //printf("Parse_DoBlockLine: Line %i\n", Parser->CurLine);
+
+ switch(LookAhead(Parser))
{
- AST_AppendNode( ret, Parse_DoExpr(Parser) );
- SyntaxAssert( GetToken(Parser), TOK_SEMICOLON );
+
+ // Return from a method
+ case TOK_RWD_RETURN:
+ //printf("return\n");
+ GetToken(Parser);
+ ret = AST_NewUniOp(NODETYPE_RETURN, Parse_DoExpr0(Parser));
+ break;
+
+ // Define Variables
+ case TOK_RWD_OBJECT:
+ case TOK_RWD_STRING:
+ case TOK_RWD_REAL:
+ case TOK_RWD_INTEGER:
+ {
+ int type;
+
+ switch(GetToken(Parser))
+ {
+ case TOK_RWD_INTEGER: type = SS_DATATYPE_INTEGER; break;
+ case TOK_RWD_OBJECT: type = SS_DATATYPE_OBJECT; break;
+ case TOK_RWD_REAL: type = SS_DATATYPE_REAL; break;
+ case TOK_RWD_STRING: type = SS_DATATYPE_STRING; break;
+ }
+
+ SyntaxAssert(Parser, GetToken(Parser), TOK_VARIABLE);
+
+ ret = Parse_GetVarDef(Parser, type);
+ }
+ break;
+
+ // Default
+ default:
+ //printf("exp0\n");
+ ret = Parse_DoExpr0(Parser);
+ break;
}
+
+ SyntaxAssert(Parser, GetToken(Parser), TOK_SEMICOLON );
return ret;
}
/**
- * \brief Parse an expression
+ * \brief Get a variable definition
*/
-tAST_Node *Parse_DoExpr(tParser *Parser)
+tAST_Node *Parse_GetVarDef(tParser *Parser, int Type)
{
- return Parse_DoExpr0(Parser);
+ char name[Parser->TokenLen];
+ tAST_Node *ret;
+
+ SyntaxAssert(Parser, Parser->Token, TOK_VARIABLE);
+
+ // copy the name (trimming the $)
+ memcpy(name, Parser->TokenStr+1, Parser->TokenLen-1);
+ name[Parser->TokenLen-1] = 0;
+ // Define the variable
+ ret = AST_NewDefineVar(Type, name);
+ // Handle arrays
+ while( LookAhead(Parser) == TOK_SQUARE_OPEN )
+ {
+ GetToken(Parser);
+ AST_AppendNode(ret, Parse_DoExpr0(Parser));
+ SyntaxAssert(Parser, GetToken(Parser), TOK_SQUARE_CLOSE);
+ }
+ return ret;
}
/**
#if 0
case TOK_DIV_EQU:
GetToken(Parser); // Eat Token
- ret = AST_NewAssignOp(ret, NODETYPE_DIVIDE, DoExpr0(Parser));
+ ret = AST_NewAssign(NODETYPE_DIVIDE, ret, Parse_DoExpr0(Parser));
break;
case TOK_MULT_EQU:
GetToken(Parser); // Eat Token
- ret = AST_NewAssignOp(ret, NODETYPE_MULTIPLY, DoExpr0(Parser));
+ ret = AST_NewAssign(NODETYPE_MULTIPLY, ret, Parse_DoExpr0(Parser));
break;
#endif
- default: break;
+ default:
+ #if DEBUG >= 2
+ printf("Parse_DoExpr0: Parser->Token = %i\n", Parser->Token);
+ #endif
+ break;
}
return ret;
}
// --------------------
tAST_Node *Parse_DoParen(tParser *Parser)
{
+ #if DEBUG >= 2
+ printf("Parse_DoParen: (Parser=%p)\n", Parser);
+ #endif
if(LookAhead(Parser) == TOK_PAREN_OPEN)
{
tAST_Node *ret;
GetToken(Parser);
+
+ // TODO: Handle casts here
+
ret = Parse_DoExpr0(Parser);
- SyntaxAssert(GetToken(Parser), TOK_PAREN_CLOSE);
+ SyntaxAssert(Parser, GetToken(Parser), TOK_PAREN_CLOSE);
return ret;
}
else
{
int tok = LookAhead(Parser);
+ #if DEBUG >= 2
+ printf("Parse_DoValue: tok = %i\n", tok);
+ #endif
+
switch(tok)
{
case TOK_STR: return Parse_GetString(Parser);
case TOK_VARIABLE: return Parse_GetVariable(Parser);
default:
- //ParseError2( tok, TOK_T_VALUE );
- return NULL;
+ fprintf(stderr, "Syntax Error: Unexpected %s on line %i, Expected TOK_T_VALUE\n",
+ csaTOKEN_NAMES[tok], Parser->CurLine);
+ longjmp( Parser->JmpTarget, -1 );
}
}
*/
tAST_Node *Parse_GetVariable(tParser *Parser)
{
- char *name;
tAST_Node *ret;
- SyntaxAssert( GetToken(Parser), TOK_VARIABLE );
- name = strndup( Parser->TokenStr+1, Parser->TokenLen-1 );
- ret = AST_NewVariable( name );
- free(name);
+ SyntaxAssert( Parser, GetToken(Parser), TOK_VARIABLE );
+ {
+ char name[Parser->TokenLen];
+ memcpy(name, Parser->TokenStr+1, Parser->TokenLen-1);
+ name[Parser->TokenLen-1] = 0;
+ ret = AST_NewVariable( name );
+ #if DEBUG >= 2
+ printf("Parse_GetVariable: name = '%s'\n", name);
+ #endif
+ }
+ // Handle array references
+ while( LookAhead(Parser) == TOK_SQUARE_OPEN )
+ {
+ GetToken(Parser);
+ ret = AST_NewBinOp(NODETYPE_INDEX, ret, Parse_DoExpr0(Parser));
+ SyntaxAssert(Parser, GetToken(Parser), TOK_SQUARE_CLOSE);
+ }
return ret;
}
{
tAST_Node *ret;
char *name;
- SyntaxAssert( GetToken(Parser), TOK_IDENT );
+ SyntaxAssert(Parser, GetToken(Parser), TOK_IDENT );
name = strndup( Parser->TokenStr, Parser->TokenLen );
+ #if 0
+ while( GetToken(Parser) == TOK_SCOPE )
+ {
+ ret = AST_New
+ }
+ PutBack(Parser);
+ #endif
+
if( GetToken(Parser) == TOK_PAREN_OPEN )
{
+ #if DEBUG >= 2
+ printf("Parse_GetIdent: Calling '%s'\n", name);
+ #endif
// Function Call
ret = AST_NewFunctionCall( name );
// Read arguments
{
PutBack(Parser);
do {
+ #if DEBUG >= 2
+ printf(" Parse_GetIdent: Argument\n");
+ #endif
AST_AppendFunctionCallArg( ret, Parse_DoExpr0(Parser) );
} while(GetToken(Parser) == TOK_COMMA);
- SyntaxAssert( Parser->Token, TOK_PAREN_CLOSE );
+ SyntaxAssert( Parser, Parser->Token, TOK_PAREN_CLOSE );
+ #if DEBUG >= 2
+ printf(" Parse_GetIdent: All arguments parsed\n");
+ #endif
}
}
else {
// Runtime Constant
+ #if DEBUG >= 2
+ printf("Parse_GetIdent: Referencing '%s'\n", name);
+ #endif
PutBack(Parser);
ret = AST_NewConstant( name );
}
/**
* \brief Check for an error
*/
-void SyntaxAssert(int Have, int Want)
+void SyntaxAssert(tParser *Parser, int Have, int Want)
{
if(Have != Want) {
- fprintf(stderr, "ERROR: Expected %i, got %i\n", Want, Have);
- //longjmp(jmpTarget, 1);
- return;
+ fprintf(stderr, "ERROR: SyntaxAssert Failed, Expected %s(%i), got %s(%i) on line %i\n",
+ csaTOKEN_NAMES[Want], Want, csaTOKEN_NAMES[Have], Have, Parser->CurLine);
+ longjmp(Parser->JmpTarget, -1);
}
}
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