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evalexpr: parse: clean-up character conversion 

Differentiate the postfix and prefix cases to allow overlap in operators
used for each kind of operation
This commit is contained in:
Bruno BELANYI 2020-10-30 19:44:49 +01:00
parent 44bf3d98af
commit 3b51111ff5
1 changed files with 14 additions and 6 deletions
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20
src/parse/climbing_parse.c
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@ -46,11 +46,19 @@ static enum op_kind char_to_binop(char c)
UNREACHABLE();
}
// Only works because no overlap between prefix and postfix operators
static enum op_kind char_to_unop(char c)
static enum op_kind char_to_prefix(char c)
{
for (size_t i = 0; i < ARR_SIZE(ops); ++i)
if (ops[i].fix != OP_INFIX && c == ops[i].op[0])
if (ops[i].fix == OP_PREFIX && c == ops[i].op[0])
return ops[i].kind;
UNREACHABLE();
}
static enum op_kind char_to_postfix(char c)
{
for (size_t i = 0; i < ARR_SIZE(ops); ++i)
if (ops[i].fix == OP_POSTFIX && c == ops[i].op[0])
return ops[i].kind;
UNREACHABLE();
@ -159,7 +167,7 @@ static bool update_op(enum op_kind *op, const char **input)
}
if (is_postfix(c))
{
*op = char_to_unop(c);
*op = char_to_postfix(c);
return true;
}
@ -231,8 +239,8 @@ static struct ast_node *parse_operand(const char **input)
int val = 0;
if (is_prefix(*input[0]))
{
enum op_kind op = char_to_unop(*input[0]);
// Remove the parenthesis
enum op_kind op = char_to_prefix(*input[0]);
// Remove the operator
eat_char(input);
ast = climbing_parse_internal(input, next_prec(op));