79 lines
3.3 KiB
Plaintext
79 lines
3.3 KiB
Plaintext
# Parsodus - A language agnostic parser generator
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# Copyright © 2016-2017 Thomas Avé, Robin Jadoul, Kobe Wullaert
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#
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# Permission is hereby granted, free of charge, to any person obtaining
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# a copy of this software and associated documentation files (the "Software"),
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# to deal in the Software without restriction, including without limitation
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# the rights to use, copy, modify, merge, publish, distribute, sublicense,
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# and/or sell copies of the Software, and to permit persons to whom the
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# Software is furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included
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# in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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# OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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# DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
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# OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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parser: LALR(1)
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lexesis: calcLexer.lxs
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precedence:
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right "EXPONENT"
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left "TIMES" "DIVIDE"
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left "PLUS" "MINUS"
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nonassoc "LT"
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start: <start>
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grammar:
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<start> ::= <toplevel> <start> [toplevel]
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| [toplevel]
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;
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<toplevel> ::= <toplevel_expr> "SEMICOLON" [toplevel]
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| <toplevel_functiondef> "SEMICOLON" [toplevel]
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| <toplevel_assign> "SEMICOLON" [toplevel]
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| <toplevel_error> "SEMICOLON" [toplevel]
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;
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<toplevel_expr> ::= <expr> [toplevel];
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<toplevel_functiondef> ::= <functiondef> [toplevel];
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<toplevel_assign> ::= <assign> [toplevel];
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<toplevel_error> ::= <error> [toplevel];
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<expr> ::= <expr> "PLUS" <expr> [binop]
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| <expr> "MINUS" <expr> [binop]
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| <expr> "TIMES" <expr> [binop]
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| <expr> "DIVIDE" <expr> [binop]
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| <expr> "EXPONENT" <expr> [binop]
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| <expr> "LT" <expr> [binop]
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| "IDENT" [expr_simple]
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| "NUM" [expr_simple]
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| "MINUS" <expr> [umin, right 1]
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| "LPAREN" <expr> "RPAREN" [parenthesized]
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| "IDENT" "LPAREN" <opt_arguments> "RPAREN" [functioncall]
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;
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<opt_arguments> ::= <arguments> [opt_arguments]
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| [opt_arguments]
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;
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<arguments> ::= <expr> [arguments]
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| <arguments> "COMMA" <expr> [arguments]
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;
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<functiondef> ::= "FN" "IDENT" "LPAREN" <opt_idents> "RPAREN" "ARROW" <expr> [functiondef];
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<opt_idents> ::= <idents> [opt_idents]
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| [opt_idents]
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;
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<idents> ::= "IDENT" [idents]
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| <idents> "COMMA" "IDENT" [idents]
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;
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<assign> ::= "IDENT" "ASSIGN" <expr> [assign];
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