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fix https://github.com/blueloveTH/pocketpy/issues/65

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This commit is contained in:
blueloveTH 2023-04-27 13:44:24 +08:00
parent 724c3f491c
commit cb36966464
4 changed files with 31 additions and 13 deletions
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13
python/builtins.py
View File

@ -86,11 +86,14 @@ def str::split(self, sep):
res.append(self) res.append(self)
return res return res
def str::index(self, sub): def str::format(self, *args):
for i in range(len(self)): if '{}' in self:
if self[i:i+len(sub)] == sub: for i in range(len(args)):
return i self = self.replace('{}', str(args[i]), 1)
return -1 else:
for i in range(len(args)):
self = self.replace('{'+str(i)+'}', str(args[i]))
return self
def str::strip(self, chars=None): def str::strip(self, chars=None):
chars = chars or ' \t\n\r' chars = chars or ' \t\n\r'

14
src/pocketpy.h
View File

@ -390,11 +390,21 @@ inline void init_builtins(VM* _vm) {
return VAR(self < obj); return VAR(self < obj);
}); });
_vm->bind_method<2>("str", "replace", [](VM* vm, ArgsView args) { _vm->bind_method<-1>("str", "replace", [](VM* vm, ArgsView args) {
if(args.size() != 1+2 && args.size() != 1+3) vm->TypeError("replace() takes 2 or 3 arguments");
const Str& self = CAST(Str&, args[0]); const Str& self = CAST(Str&, args[0]);
const Str& old = CAST(Str&, args[1]); const Str& old = CAST(Str&, args[1]);
const Str& new_ = CAST(Str&, args[2]); const Str& new_ = CAST(Str&, args[2]);
return VAR(self.replace(old, new_)); int count = args.size()==1+3 ? CAST(int, args[3]) : -1;
return VAR(self.replace(old, new_, count));
});
_vm->bind_method<1>("str", "index", [](VM* vm, ArgsView args) {
const Str& self = CAST(Str&, args[0]);
const Str& sub = CAST(Str&, args[1]);
int index = self.index(sub);
if(index == -1) vm->ValueError("substring not found");
return VAR(index);
}); });
_vm->bind_method<1>("str", "startswith", [](VM* vm, ArgsView args) { _vm->bind_method<1>("str", "startswith", [](VM* vm, ArgsView args) {

9
src/str.h
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@ -224,19 +224,18 @@ struct Str{
return p - data; return p - data;
} }
Str replace(const Str& old, const Str& new_) const { Str replace(const Str& old, const Str& new_, int count=-1) const {
std::stringstream ss; std::stringstream ss;
int start = 0; int start = 0;
while(true){ while(true){
int i = index(old, start); int i = index(old, start);
if(i == -1){ if(i == -1) break;
ss << substr(start, size - start);
break;
}
ss << substr(start, i - start); ss << substr(start, i - start);
ss << new_; ss << new_;
start = i + old.size; start = i + old.size;
if(count != -1 && --count == 0) break;
} }
ss << substr(start, size - start);
return ss.str(); return ss.str();
} }

6
tests/04_str.py
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@ -76,3 +76,9 @@ assert str(num) == '6'
测试 = "test" 测试 = "test"
assert 测试 == "test" assert 测试 == "test"
assert "Hello, {}!".format("World") == "Hello, World!"
assert "{} {} {}".format("I", "love", "Python") == "I love Python"
assert "{0} {1} {2}".format("I", "love", "Python") == "I love Python"
assert "{2} {1} {0}".format("I", "love", "Python") == "Python love I"
assert "{0}{1}{0}".format("abra", "cad") == "abracadabra"