From 6eb5ea040f9ebc1a99953ff72c48ebe9f97f7f3c Mon Sep 17 00:00:00 2001
From: tomsmeding <tom.smeding@gmail.com>
Date: Sat, 6 Aug 2016 11:51:11 +0200
Subject: Ditch suffix; make prefix work better

---
 parser.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

(limited to 'parser.c')

diff --git a/parser.c b/parser.c
index 6cced13..b2bd68b 100644
--- a/parser.c
+++ b/parser.c
@@ -118,6 +118,14 @@ static Token nexttoken(const char **sourcep,bool expectop){
 		*sourcep+=oplen;
 		return tok;
 	}
+	if(!expectop){
+		char buf[4]={'(',*source,')','\0'};
+		if(precedence(buf)!=-1){
+			Token tok={TT_OP,source,1};
+			(*sourcep)++;
+			return tok;
+		}
+	}
 	if(strchr("(){}",*source)!=NULL){
 		Token tok={TT_SYM,source,1};
 		(*sourcep)++;
@@ -275,7 +283,7 @@ static AST* parseterm(const char *source,int *reslen){
 				node->o.op=opconststring_len(buf,tok.len+2);
 				node->o.left=NULL;
 				int len;
-				node->o.right=parseterm(source,&len);
+				node->o.right=parseexpr(source,&len,precedence(buf));
 				if(!node->o.right){
 					free(node);
 					return NULL;
@@ -290,6 +298,7 @@ static AST* parseterm(const char *source,int *reslen){
 		case TT_ERR:
 			return NULL;
 	}
+
 	*reslen=source-origsource;
 	return node;
 }
@@ -306,10 +315,12 @@ static AST* parseexpr(const char *source,int *reslen,int minprec){
 		Token tok=nexttoken(&source,true);
 		printtoken(stderr,tok,"parseEXPR");
 		if(tok.type==TT_ENDSTMT){
+			fprintf(stderr,"  (token undo)\n");
 			source=beforeop;
 			break;
 		}
 		if(tok.type==TT_SYM&&tok.len==1&&tok.str[0]==')'){
+			fprintf(stderr,"  (token undo)\n");
 			source=beforeop;
 			break;
 		}
@@ -319,6 +330,7 @@ static AST* parseexpr(const char *source,int *reslen,int minprec){
 		}
 		int prec=precedence_len(tok.str,tok.len);
 		if(prec<minprec){
+			fprintf(stderr,"  (token undo)\n");
 			source=beforeop;
 			break;
 		}
@@ -383,6 +395,7 @@ AST* parse(const char *source){
 		cursor+=reslen;
 		const char *src=source+cursor;
 		Token tok=nexttoken(&src,false);
+		printtoken(stderr,tok,"parse    ");
 		if(tok.type!=TT_ENDSTMT){
 			ast_free(bl);
 			return NULL;
-- 
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