From 2696105687d9c889ec4cccd449846135f83af404 Mon Sep 17 00:00:00 2001
From: tomsmeding <tom.smeding@gmail.com>
Date: Sat, 6 Aug 2016 11:17:56 +0200
Subject: Fix (-) handling

---
 code.txt |  4 +++-
 parser.c | 39 ++++++++++++++++++++++++++++++---------
 2 files changed, 33 insertions(+), 10 deletions(-)

diff --git a/code.txt b/code.txt
index 3b04c0f..ae7ef31 100644
--- a/code.txt
+++ b/code.txt
@@ -1,3 +1,5 @@
 a = 1;
 b = 2;
-c = 1 + -x - 3 > -1;
+c = 1 + (- a - 3 + b > -1);
+b += 1;
+b = 3*(b//3-1);
diff --git a/parser.c b/parser.c
index 14fd47d..6cced13 100644
--- a/parser.c
+++ b/parser.c
@@ -79,7 +79,7 @@ static void skipintermediate(const char **sourcep){
 	*sourcep=source;
 }
 
-static Token nexttoken(const char **sourcep){
+static Token nexttoken(const char **sourcep,bool expectop){
 	skipintermediate(sourcep);
 	const char *source=*sourcep;
 	if(*source=='\0'){
@@ -91,7 +91,7 @@ static Token nexttoken(const char **sourcep){
 		(*sourcep)++;
 		return tok;
 	}
-	if(isdigit(*source)||(*source=='-'&&isdigit(source[1]))){
+	if(isdigit(*source)||(!expectop&&*source=='-'&&isdigit(source[1]))){
 		char *endp;
 		strtod(source,&endp);
 		assert(endp!=source);
@@ -161,9 +161,11 @@ static void printtoken(FILE *stream,Token tok,const char *msg){
 }
 
 
+static AST* parseexpr(const char *source,int *reslen,int minprec);
+
 static AST* parseterm(const char *source,int *reslen){
 	const char *origsource=source;
-	const Token tok=nexttoken(&source);
+	const Token tok=nexttoken(&source,false);
 	printtoken(stderr,tok,"parseterm");
 	AST *node;
 	switch(tok.type){
@@ -229,7 +231,7 @@ static AST* parseterm(const char *source,int *reslen){
 			if(tok.len==2&&memcmp(tok.str,"if",2)==0)assert(NOT_IMPLEMENTED);
 			if(tok.len==5&&memcmp(tok.str,"while",2)==0)assert(NOT_IMPLEMENTED);
 			const char *tempsource=source;
-			Token next=nexttoken(&source);
+			Token next=nexttoken(&source,false);
 			if(next.len==1&&next.str[0]=='(')assert(NOT_IMPLEMENTED);
 			source=tempsource;
 			node=malloc(sizeof(AST));
@@ -243,7 +245,21 @@ static AST* parseterm(const char *source,int *reslen){
 		}
 
 		case TT_SYM:
-			assert(NOT_IMPLEMENTED);
+			if(tok.len==1&&tok.str[0]=='{'){
+				assert(NOT_IMPLEMENTED);
+			} else if(tok.len==1&&tok.str[0]=='('){
+				int len;
+				node=parseexpr(source,&len,0);
+				if(!node)return NULL;
+				source+=len;
+				Token aftertok=nexttoken(&source,false);
+				if(aftertok.type!=TT_SYM||aftertok.len!=1||aftertok.str[0]!=')'){
+					ast_free(node);
+					return NULL;
+				}
+			} else {
+				return NULL;
+			}
 			break;
 
 		case TT_OP:{
@@ -287,12 +303,16 @@ static AST* parseexpr(const char *source,int *reslen,int minprec){
 	source+=len;
 	while(true){
 		const char *beforeop=source;
-		Token tok=nexttoken(&source);
+		Token tok=nexttoken(&source,true);
 		printtoken(stderr,tok,"parseEXPR");
 		if(tok.type==TT_ENDSTMT){
 			source=beforeop;
 			break;
 		}
+		if(tok.type==TT_SYM&&tok.len==1&&tok.str[0]==')'){
+			source=beforeop;
+			break;
+		}
 		if(tok.type!=TT_OP){
 			ast_free(tree);
 			return NULL;
@@ -362,14 +382,14 @@ AST* parse(const char *source){
 		bl->b.exprs[bl->b.len++]=node;
 		cursor+=reslen;
 		const char *src=source+cursor;
-		Token tok=nexttoken(&src);
+		Token tok=nexttoken(&src,false);
 		if(tok.type!=TT_ENDSTMT){
 			ast_free(bl);
 			return NULL;
 		}
 		cursor=src-source;
 		src=source+cursor;
-		tok=nexttoken(&src);
+		tok=nexttoken(&src,false);
 		if(tok.type==TT_EOF)break;
 	}
 	return bl;
@@ -409,10 +429,11 @@ static void ast_debug_(FILE *stream,const AST *ast,int indent){
 		case AST_OP:{
 			bool leftp=ast->o.left&&ast->o.left->type==AST_OP&&precedence(ast->o.left->o.op)<=precedence(ast->o.op);
 			bool rightp=ast->o.right&&ast->o.right->type==AST_OP&&precedence(ast->o.right->o.op)<=precedence(ast->o.op);
+			bool spaces=ast->o.left&&ast->o.right;
 			//fprintf(stderr,"[[op='%s' p=%d lp=%d rp=%d]]",ast->o.op,precedence(ast->o.op),leftp,rightp);
 			if(leftp)fputc('(',stream);
 			if(ast->o.left)ast_debug_(stream,ast->o.left,indent);
-			fprintf(stream,"%s%s%s",leftp?")":"",ast->o.op,rightp?"(":"");
+			fprintf(stream,"%s%s%s%s%s",leftp?")":"",spaces?" ":"",ast->o.op,spaces?" ":"",rightp?"(":"");
 			if(ast->o.right)ast_debug_(stream,ast->o.right,indent);
 			if(rightp)fputc(')',stream);
 			break;
-- 
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