53 lines
899 B
Plaintext
53 lines
899 B
Plaintext
%{
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open LDText.Ast
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open FSharp.Text.Lexing
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%}
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// tokens, used by lexer
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%token <string> IDENTIFIER
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%token LEFT_PAREN
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%token RIGHT_PAREN
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%token LEFT_BRACKET
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%token RIGHT_BRACKET
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%token COMMA
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%token SEMICOLON
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%token QUESTION_MARK
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%token EOF
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// start token
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%start rung
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// return type of parser, marked by start token
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%type <Rung> rung
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%%
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rung:
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| steps SEMICOLON EOF { Rung $1 }
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steps:
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| { [] }
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| instr steps { StepInstr $1 :: $2 }
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| branch steps { StepBranch $1 :: $2 }
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branch:
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| LEFT_BRACKET branch_arms RIGHT_BRACKET { Branch $2 }
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branch_arms:
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| { [] }
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| steps COMMA branch_arms { BranchArm $1 :: $3}
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| steps { [ BranchArm $1 ] }
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instr:
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| IDENTIFIER LEFT_PAREN operands RIGHT_PAREN { { Op = $1; Args = $3 } }
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operands:
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| { [] }
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| operand COMMA operands { $1 :: $3 }
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| operand { [ $1 ] }
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operand:
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| IDENTIFIER { OperandTag $1 }
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| QUESTION_MARK { OperandHole }
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%%
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