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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 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 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"
# Goals:
rule goal: expr_lst END {{ return expr_lst }}
rule goal_argspec: argspec END {{ return argspec }}
# Arguments:
rule argspec: argspec_item {{ argpairs = [argspec_item] }}
(
"," {{ argspec_item = (None, None) }}
[ argspec_item ] {{ argpairs.append(argspec_item) }}
)* {{ return ArgspecLiteral(argpairs) }}
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 (
expr_map {{ v = expr_map }}
| expr_lst {{ v = expr_lst }}
) RPAR {{ return Parentheses(v) }}
| FNCT {{ argspec = ArgspecLiteral([]) }}
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(STR[1:-1], quotes="'")) }}
| QSTR {{ return Literal(String(QSTR[1:-1], quotes='"')) }}
| COLOR {{ return Literal(Color(ParserValue(COLOR))) }}
| VAR {{ return Variable(VAR) }}
rule kwatom:
| KWID {{ return Literal(parse_bareword(KWID)) }}
| KWNUM {{ UNITS = None }}
[ UNITS ] {{ return Literal(Number(float(KWNUM), unit=UNITS)) }}
| KWSTR {{ return Literal(String(KWSTR[1:-1], quotes="'")) }}
| KWQSTR {{ return Literal(String(KWQSTR[1:-1], quotes='"')) }}
| KWCOLOR {{ return Literal(Color(ParserValue(KWCOLOR))) }}
| KWVAR {{ return Variable(KWVAR) }}
%%
### Grammar ends.
################################################################################
|
