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#!/usr/bin/env python
# -*- coding: utf-8 -*-
from itertools import product, chain, zip_longest, tee
# The amount of branches to generate
BRANCHES = 2 # branches
IF, ELSE_IF, ELSE, END_IF = 0, 1, 2, 3
NL = "\\n"
def handle_ws(ws, trim=True):
return [" ", "-" if trim else "+"][ws]
def trim(s, ws):
if ws[0]:
s = s.lstrip()
if ws[1]:
s = s.rstrip()
return s
def cond_kind(i, n):
i += 1
if i == 1:
return IF # if
elif (i == n) and (i > 1):
return ELSE # else
elif i > n:
return END_IF # endif
else:
return ELSE_IF # else if
# From: https://docs.python.org/3/library/itertools.html#itertools-recipes
def pairwise(iterable):
a, b = tee(iterable)
next(b, None)
return zip(a, b)
def write_cond(conds, active_branch, sign, invert):
n = len(conds) - 1
trim = sign == "-"
lits = []
for i in range(1, n + 2 + 1):
ws1 = "\\n" * i
ws2 = "\\r\\n" * i
lits.append((ws1, str(i), ws2))
conds = list(conds)
for i, (pws, nws) in enumerate(conds):
kind = cond_kind(i, n)
b = str(i == active_branch).lower()
cond = [f"if {b}", f"else if {b}", "else", "endif"][kind]
cond = f"{{%{handle_ws(pws, trim)} {cond} {handle_ws(nws, trim)}%}}"
conds[i] = cond
it = map("".join, lits)
it = filter(None, chain.from_iterable(zip_longest(it, conds)))
code = "".join(it)
expected = f"{lits[0][0]}{lits[0][1]}"
for i, (cond, (before, after)) in enumerate(zip(conds, pairwise(lits))):
kind = cond_kind(i, n)
pws = cond.startswith(f"{{%{sign}")
nws = cond.endswith(f"{sign}%}}")
if sign == "+":
pws = not pws
nws = not nws
elif invert:
pws = True
nws = True
cond = i == active_branch
prev_cond = i == (active_branch + 1)
if prev_cond or (kind == IF):
expected += before[2] * (not pws)
if cond or (kind == END_IF):
expected += after[0] * (not nws)
expected += after[1]
# FIXME: Askama does not include whitespace before eof
# expected += lits[-1][2]
return code, expected
def write_match(contents, arms, match_ws):
before, expr, after = contents
code = before
pws, nws = match_ws[0]
code += f"{{%{handle_ws(pws)} match {expr} {handle_ws(nws)}%}}"
for (arm, expr), (pws, nws) in zip(arms, match_ws[1:-1]):
code += f"{{%{handle_ws(pws)} when {arm} {handle_ws(nws)}%}}{expr}"
pws, nws = match_ws[-1]
code += f"{{%{handle_ws(pws)} endmatch {handle_ws(nws)}%}}"
code += after
return code
def write_match_result(active_arm, contents, arms, match_ws):
before, expr, after = contents
expected = ""
expected += trim(before, (False, match_ws[0][0]))
expected += trim(arms[active_arm][1], (match_ws[1:][active_arm][1], match_ws[1:][active_arm+1][0]))
expected += trim(after, (match_ws[-1][1], False))
return expected
def write_cond_tests(f, name_extra, config):
f.write("""
macro_rules! test_template{name_extra} {{
($source:literal, $rendered:expr) => {{{{
#[derive(Template)]
#[template(source = $source, ext = "txt"{config})]
struct CondWs;
assert_eq!(CondWs.render().unwrap(), $rendered);
}}}};
}}
#[rustfmt::skip]
#[test]
fn test_cond_ws{name_extra}() {{
""".format(name_extra = name_extra, config = config))
invert = len(name_extra) > 0
sign = "+" if invert else "-"
for branches in range(1, BRANCHES + 1):
for x in product([False, True], repeat=(branches+1)*2):
# it = iter(x)
# conds = list(zip(it, it))
conds = list(zip(x[::2], x[1::2]))
for i in range(branches):
code, expected = write_cond(conds, i, sign, invert)
f.write(f' test_template{name_extra}!("{code}", "{expected}");\n')
if invert and ("{%+" in code or "+%}" in code):
# We also check that the minus sign is trimming with suppress_whitespace
# option enabled.
code, expected = write_cond(conds, i, "-", invert)
f.write(f' test_template{name_extra}!("{code}", "{expected}");\n')
if branches != BRANCHES:
f.write("\n")
f.write("}\n")
def write_match_tests(f):
f.write("""
#[rustfmt::skip]
macro_rules! test_match {
($source:literal, $some_rendered:expr, $none_rendered:expr) => {{
#[derive(Template)]
#[template(source = $source, ext = "txt")]
struct MatchWs {
item: Option<&'static str>,
}
assert_eq!(MatchWs { item: Some("foo") }.render().unwrap(), $some_rendered);
assert_eq!(MatchWs { item: None }.render().unwrap(), $none_rendered);
}};
}
#[rustfmt::skip]
#[test]
fn test_match_ws() {
""")
contents = "before ", "item", " after"
arms = [("Some with (item)", " foo "), ("None", " bar ")]
for x in product([False, True], repeat=len(arms)*2+1):
x = [False, False, *x, False]
arms_ws = list(zip(x[::2], x[1::2]))
code = write_match(contents, arms, arms_ws)
some_expected = write_match_result(0, contents, arms, arms_ws)
none_expected = write_match_result(1, contents, arms, arms_ws)
f.write(f' test_match!("{code}", "{some_expected}", "{none_expected}");\n')
f.write("}\n")
if __name__ == "__main__":
with open("ws.rs", "w") as f:
f.write("// This file is auto generated by gen_ws_tests.py\n\n")
f.write("use askama::Template;\n")
write_cond_tests(f, "", "")
write_cond_tests(f, "_inverted", ', config = "test_trim.toml"')
write_match_tests(f)
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