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|
# python yapps2.py grammar.g grammar.py
################################################################################
## Grammar compiled using Yapps:
%%
parser SassExpression:
ignore: "[ \r\t\n]+"
token LPAR: "\\(|\\["
token RPAR: "\\)|\\]"
token END: "$"
token MUL: "[*]"
token DIV: "/"
token ADD: "[+]"
token SUB: "-\s"
token SIGN: "-(?![a-zA-Z_])"
token AND: "(?<![-\w])and(?![-\w])"
token OR: "(?<![-\w])or(?![-\w])"
token NOT: "(?<![-\w])not(?![-\w])"
token NE: "!="
token INV: "!"
token EQ: "=="
token LE: "<="
token GE: ">="
token LT: "<"
token GT: ">"
token DOTDOTDOT: '[.]{3}'
token KWSTR: "'[^'\\\\]*(?:\\\\.[^'\\\\]*)*'(?=\s*:)"
token STR: "'[^'\\\\]*(?:\\\\.[^'\\\\]*)*'"
token KWQSTR: '"[^"\\\\]*(?:\\\\.[^"\\\\]*)*"(?=\s*:)'
token QSTR: '"[^"\\\\]*(?:\\\\.[^"\\\\]*)*"'
token UNITS: "(?<!\s)(?:[a-zA-Z]+|%)(?![-\w])"
token KWNUM: "(?:\d+(?:\.\d*)?|\.\d+)(?=\s*:)"
token NUM: "(?:\d+(?:\.\d*)?|\.\d+)"
token KWCOLOR: "#(?:[a-fA-F0-9]{6}|[a-fA-F0-9]{3})(?![a-fA-F0-9])(?=\s*:)"
token COLOR: "#(?:[a-fA-F0-9]{6}|[a-fA-F0-9]{3})(?![a-fA-F0-9])"
token KWVAR: "\$[-a-zA-Z0-9_]+(?=\s*:)"
token SLURPYVAR: "\$[-a-zA-Z0-9_]+(?=[.][.][.])"
token VAR: "\$[-a-zA-Z0-9_]+"
token FNCT: "[-a-zA-Z_][-a-zA-Z0-9_]*(?=\()"
token KWID: "[-a-zA-Z_][-a-zA-Z0-9_]*(?=\s*:)"
token ID: "[-a-zA-Z_][-a-zA-Z0-9_]*"
token BANG_IMPORTANT: "!important"
# http://dev.w3.org/csswg/css-syntax-3/#consume-a-url-token0
# URLs may not contain quotes, parentheses, or unprintables
# TODO reify escapes, for this and for strings
# FIXME: Also, URLs may not contain $ as it breaks urls with variables?
token URL: "(?:[\\\\].|[^$'\"()\\x00-\\x08\\x0b\\x0e-\\x1f\\x7f])*"
# Goals:
rule goal: expr_lst END {{ return expr_lst }}
rule goal_argspec: argspec END {{ return argspec }}
# Arguments:
# TODO should support multiple slurpies, and enforce (probably not in the
# parser) that positional args come first
rule argspec:
[
argspec_items {{ args, slurpy = argspec_items }}
{{ return ArgspecLiteral(args, slurp=slurpy) }}
] {{ return ArgspecLiteral([]) }}
| SLURPYVAR DOTDOTDOT {{ return ArgspecLiteral([], slurp=SLURPYVAR) }}
| DOTDOTDOT {{ return ArgspecLiteral([], slurp=all) }}
rule argspec_items:
{{ slurpy = None }}
argspec_item {{ args = [argspec_item] }}
[ "," [
SLURPYVAR DOTDOTDOT {{ slurpy = SLURPYVAR }}
| DOTDOTDOT {{ slurpy = all }}
| argspec_items {{ more_args, slurpy = argspec_items }}
{{ args.extend(more_args) }}
] ] {{ return args, slurpy }}
rule argspec_item:
KWVAR ":" expr_slst {{ return (Variable(KWVAR), expr_slst) }}
| expr_slst {{ return (None, expr_slst) }}
# Maps:
rule expr_map:
map_item {{ pairs = [map_item] }}
(
"," {{ map_item = (None, None) }}
[ map_item ] {{ pairs.append(map_item) }}
)* {{ return MapLiteral(pairs) }}
rule map_item:
kwatom ":" expr_slst {{ return (kwatom, expr_slst) }}
# Lists:
rule expr_lst:
expr_slst {{ v = [expr_slst] }}
(
","
expr_slst {{ v.append(expr_slst) }}
)* {{ return ListLiteral(v) if len(v) > 1 else v[0] }}
# Expressions:
rule expr_slst:
or_expr {{ v = [or_expr] }}
(
or_expr {{ v.append(or_expr) }}
)* {{ return ListLiteral(v, comma=False) if len(v) > 1 else v[0] }}
rule or_expr:
and_expr {{ v = and_expr }}
(
OR and_expr {{ v = AnyOp(v, and_expr) }}
)* {{ return v }}
rule and_expr:
not_expr {{ v = not_expr }}
(
AND not_expr {{ v = AllOp(v, not_expr) }}
)* {{ return v }}
rule not_expr:
comparison {{ return comparison }}
| NOT not_expr {{ return NotOp(not_expr) }}
rule comparison:
a_expr {{ v = a_expr }}
(
LT a_expr {{ v = BinaryOp(operator.lt, v, a_expr) }}
| GT a_expr {{ v = BinaryOp(operator.gt, v, a_expr) }}
| LE a_expr {{ v = BinaryOp(operator.le, v, a_expr) }}
| GE a_expr {{ v = BinaryOp(operator.ge, v, a_expr) }}
| EQ a_expr {{ v = BinaryOp(operator.eq, v, a_expr) }}
| NE a_expr {{ v = BinaryOp(operator.ne, v, a_expr) }}
)* {{ return v }}
rule a_expr:
m_expr {{ v = m_expr }}
(
ADD m_expr {{ v = BinaryOp(operator.add, v, m_expr) }}
| SUB m_expr {{ v = BinaryOp(operator.sub, v, m_expr) }}
)* {{ return v }}
rule m_expr:
u_expr {{ v = u_expr }}
(
MUL u_expr {{ v = BinaryOp(operator.mul, v, u_expr) }}
| DIV u_expr {{ v = BinaryOp(operator.truediv, v, u_expr) }}
)* {{ return v }}
rule u_expr:
SIGN u_expr {{ return UnaryOp(operator.neg, u_expr) }}
| ADD u_expr {{ return UnaryOp(operator.pos, u_expr) }}
| atom {{ return atom }}
rule atom:
LPAR (
{{ v = ListLiteral([], comma=False) }}
| expr_map {{ v = expr_map }}
| expr_lst {{ v = expr_lst }}
) RPAR {{ return Parentheses(v) }}
# Special functions. Note that these technically overlap with the
# regular function rule, which makes this not quite LL -- but they're
# different tokens so yapps can't tell, and it resolves the conflict by
# picking the first one.
| "url" LPAR
(
URL {{ quotes = None }}
| "\"" URL "\"" {{ quotes = '"' }}
| "'" URL "'" {{ quotes = "'" }}
)
RPAR {{ return Literal(Url(URL, quotes=quotes)) }}
| FNCT LPAR argspec RPAR {{ return CallOp(FNCT, argspec) }}
| BANG_IMPORTANT {{ return Literal(String(BANG_IMPORTANT, quotes=None)) }}
| ID {{ return Literal(parse_bareword(ID)) }}
| NUM {{ UNITS = None }}
[ UNITS ] {{ return Literal(Number(float(NUM), unit=UNITS)) }}
| STR {{ return Literal(String(dequote(STR), quotes="'")) }}
| QSTR {{ return Literal(String(dequote(QSTR), quotes='"')) }}
| COLOR {{ return Literal(Color.from_hex(COLOR, literal=True)) }}
| VAR {{ return Variable(VAR) }}
rule kwatom:
# nothing
| KWID {{ return Literal(parse_bareword(KWID)) }}
| KWNUM {{ UNITS = None }}
[ UNITS ] {{ return Literal(Number(float(KWNUM), unit=UNITS)) }}
| KWSTR {{ return Literal(String(dequote(KWSTR), quotes="'")) }}
| KWQSTR {{ return Literal(String(dequote(KWQSTR), quotes='"')) }}
| KWCOLOR {{ return Literal(Color.from_hex(KWCOLOR, literal=True)) }}
| KWVAR {{ return Variable(KWVAR) }}
%%
### Grammar ends.
################################################################################
|
