模板语言语法分析

gistfile1.txt

{{Variable}}

{{#if conditions}}
    BLOCK
{{/if}}

{{#if conditions}}
    BLOCK
{{#elseif conditions}}
    ELSEIF BLOCK
{{#else}}
    ELSE BLOCK
{{/if}}

{{#each conditions as value index}}
    BLOCK
{{/each}}

{{#! comments}}


/* description: Parses end executes mathematical expressions. */

/* lexical grammar */
%lex

%%
\s+                   /* skip whitespace */

<<EOF>>               return 'EOF';

/lex

/* operator associations and precedence */


%start expressions

%% /* language grammar */

expressions
    : e EOF
        {print($1); return $1;}
    ;

e
    : e '+' e
        {$$ = $1+$3;}
    ;