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py: compiler supports string juxtaposition=concatenation.

This commit is contained in:
Damien 2013-12-10 17:41:49 +00:00
parent db4c361f1c
commit 6332174ab4
1 changed files with 25 additions and 7 deletions
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32
py/compile.c
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@ -2050,18 +2050,36 @@ void compile_power_dbl_star(compiler_t *comp, py_parse_node_struct_t *pns) {
void compile_atom_string(compiler_t *comp, py_parse_node_struct_t *pns) {
// a list of strings
EMIT(load_const_verbatim_start);
EMIT(load_const_verbatim_str, "'");
// check type of list (string or bytes) and count total number of bytes
int n = PY_PARSE_NODE_STRUCT_NUM_NODES(pns);
int n_bytes = 0;
int string_kind = PY_PARSE_NODE_NULL;
for (int i = 0; i < n; i++) {
// TODO allow concatenation of either strings or bytes, but not mixed
assert(PY_PARSE_NODE_IS_LEAF(pns->nodes[i]));
assert(PY_PARSE_NODE_LEAF_KIND(pns->nodes[i]) == PY_PARSE_NODE_STRING);
int pn_kind = PY_PARSE_NODE_LEAF_KIND(pns->nodes[i]);
assert(pn_kind == PY_PARSE_NODE_STRING || pn_kind == PY_PARSE_NODE_BYTES);
if (i == 0) {
string_kind = pn_kind;
} else if (pn_kind != string_kind) {
printf("SyntaxError: cannot mix bytes and nonbytes literals\n");
return;
}
const char *str = qstr_str(PY_PARSE_NODE_LEAF_ARG(pns->nodes[i]));
EMIT(load_const_verbatim_strn, str, strlen(str));
n_bytes += strlen(str);
}
EMIT(load_const_verbatim_str, "'");
EMIT(load_const_verbatim_end);
// allocate memory for concatenated string/bytes
char *cat_str = m_new(char, n_bytes + 1);
cat_str[0] = '\0';
// concatenate string/bytes
for (int i = 0; i < n; i++) {
const char *str = qstr_str(PY_PARSE_NODE_LEAF_ARG(pns->nodes[i]));
strcat(cat_str, str);
}
EMIT(load_const_str, qstr_from_str_take(cat_str), string_kind == PY_PARSE_NODE_BYTES);
}
// pns needs to have 2 nodes, first is lhs of comprehension, second is PN_comp_for node