52 lines
1006 B
Plaintext
52 lines
1006 B
Plaintext
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%{
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#include <stdio.h>
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int yylex();
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int yyerror(const char* p) { fprintf(stderr, p); }
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%}
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%define parse.trace
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%union {
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char* sym;
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float num;
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}
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%token <sym> ID
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%token STOP
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%token <num> NUM
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%token STRING
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%token INDENT DEDENT
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%token IF ELIF ELSE
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%right GETS
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%left '+' '-'
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%left '/' '*'
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%left MAPS
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%%
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program: statements | statements statement;
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statements: statements statement STOP
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| statements STOP
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| // null production ;
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statement: assignment | funcall | conditional;
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assignment: ID GETS expr;
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expr: funcdef
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| funcall
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| expr '+' expr
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| expr '-' expr
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| expr '*' expr
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| expr '/' expr
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| '(' expr ')'
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| ID | NUM | STRING;
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funcdef: param MAPS expr | param MAPS block;
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param: ID | '_' | // null production;
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funcall: ID '(' exprlist ')'
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exprlist: exprlist ',' expr | expr | // null production;
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conditional: IF expr block elifs
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| IF expr block elifs ELSE block;
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elifs: ELIF expr block elifs| // null production;
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block: STOP INDENT statement statements DEDENT
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%%
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