ee43212da4
This removes some unused dependencies that I know we plan to re-add later, but this makes for a clean `godep save` for now.
197 lines
4.3 KiB
Plaintext
197 lines
4.3 KiB
Plaintext
// This is the yacc input for creating the parser for interpolation
|
|
// expressions in Go. To build it, just run `go generate` on this
|
|
// package, as the lexer has the go generate pragma within it.
|
|
|
|
%{
|
|
package hil
|
|
|
|
import (
|
|
"github.com/hashicorp/hil/ast"
|
|
)
|
|
|
|
%}
|
|
|
|
%union {
|
|
node ast.Node
|
|
nodeList []ast.Node
|
|
str string
|
|
token *parserToken
|
|
}
|
|
|
|
%token <str> PROGRAM_BRACKET_LEFT PROGRAM_BRACKET_RIGHT
|
|
%token <str> PROGRAM_STRING_START PROGRAM_STRING_END
|
|
%token <str> PAREN_LEFT PAREN_RIGHT COMMA
|
|
%token <str> SQUARE_BRACKET_LEFT SQUARE_BRACKET_RIGHT
|
|
|
|
%token <token> ARITH_OP IDENTIFIER INTEGER FLOAT STRING
|
|
|
|
%type <node> expr interpolation literal literalModeTop literalModeValue
|
|
%type <nodeList> args
|
|
|
|
%left ARITH_OP
|
|
|
|
%%
|
|
|
|
top:
|
|
{
|
|
parserResult = &ast.LiteralNode{
|
|
Value: "",
|
|
Typex: ast.TypeString,
|
|
Posx: ast.Pos{Column: 1, Line: 1},
|
|
}
|
|
}
|
|
| literalModeTop
|
|
{
|
|
parserResult = $1
|
|
|
|
// We want to make sure that the top value is always a Concat
|
|
// so that the return value is always a string type from an
|
|
// interpolation.
|
|
//
|
|
// The logic for checking for a LiteralNode is a little annoying
|
|
// because functionally the AST is the same, but we do that because
|
|
// it makes for an easy literal check later (to check if a string
|
|
// has any interpolations).
|
|
if _, ok := $1.(*ast.Concat); !ok {
|
|
if n, ok := $1.(*ast.LiteralNode); !ok || n.Typex != ast.TypeString {
|
|
parserResult = &ast.Concat{
|
|
Exprs: []ast.Node{$1},
|
|
Posx: $1.Pos(),
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
literalModeTop:
|
|
literalModeValue
|
|
{
|
|
$$ = $1
|
|
}
|
|
| literalModeTop literalModeValue
|
|
{
|
|
var result []ast.Node
|
|
if c, ok := $1.(*ast.Concat); ok {
|
|
result = append(c.Exprs, $2)
|
|
} else {
|
|
result = []ast.Node{$1, $2}
|
|
}
|
|
|
|
$$ = &ast.Concat{
|
|
Exprs: result,
|
|
Posx: result[0].Pos(),
|
|
}
|
|
}
|
|
|
|
literalModeValue:
|
|
literal
|
|
{
|
|
$$ = $1
|
|
}
|
|
| interpolation
|
|
{
|
|
$$ = $1
|
|
}
|
|
|
|
interpolation:
|
|
PROGRAM_BRACKET_LEFT expr PROGRAM_BRACKET_RIGHT
|
|
{
|
|
$$ = $2
|
|
}
|
|
|
|
expr:
|
|
PAREN_LEFT expr PAREN_RIGHT
|
|
{
|
|
$$ = $2
|
|
}
|
|
| literalModeTop
|
|
{
|
|
$$ = $1
|
|
}
|
|
| INTEGER
|
|
{
|
|
$$ = &ast.LiteralNode{
|
|
Value: $1.Value.(int),
|
|
Typex: ast.TypeInt,
|
|
Posx: $1.Pos,
|
|
}
|
|
}
|
|
| FLOAT
|
|
{
|
|
$$ = &ast.LiteralNode{
|
|
Value: $1.Value.(float64),
|
|
Typex: ast.TypeFloat,
|
|
Posx: $1.Pos,
|
|
}
|
|
}
|
|
| ARITH_OP expr
|
|
{
|
|
// This is REALLY jank. We assume that a singular ARITH_OP
|
|
// means 0 ARITH_OP expr, which... is weird. We don't want to
|
|
// support *, /, etc., only -. We should fix this later with a pure
|
|
// Go scanner/parser.
|
|
if $1.Value.(ast.ArithmeticOp) != ast.ArithmeticOpSub {
|
|
panic("Unary - is only allowed")
|
|
}
|
|
|
|
$$ = &ast.Arithmetic{
|
|
Op: $1.Value.(ast.ArithmeticOp),
|
|
Exprs: []ast.Node{
|
|
&ast.LiteralNode{Value: 0, Typex: ast.TypeInt},
|
|
$2,
|
|
},
|
|
Posx: $2.Pos(),
|
|
}
|
|
}
|
|
| expr ARITH_OP expr
|
|
{
|
|
$$ = &ast.Arithmetic{
|
|
Op: $2.Value.(ast.ArithmeticOp),
|
|
Exprs: []ast.Node{$1, $3},
|
|
Posx: $1.Pos(),
|
|
}
|
|
}
|
|
| IDENTIFIER
|
|
{
|
|
$$ = &ast.VariableAccess{Name: $1.Value.(string), Posx: $1.Pos}
|
|
}
|
|
| IDENTIFIER PAREN_LEFT args PAREN_RIGHT
|
|
{
|
|
$$ = &ast.Call{Func: $1.Value.(string), Args: $3, Posx: $1.Pos}
|
|
}
|
|
| IDENTIFIER SQUARE_BRACKET_LEFT expr SQUARE_BRACKET_RIGHT
|
|
{
|
|
$$ = &ast.Index{
|
|
Target: &ast.VariableAccess{
|
|
Name: $1.Value.(string),
|
|
Posx: $1.Pos,
|
|
},
|
|
Key: $3,
|
|
Posx: $1.Pos,
|
|
}
|
|
}
|
|
|
|
args:
|
|
{
|
|
$$ = nil
|
|
}
|
|
| args COMMA expr
|
|
{
|
|
$$ = append($1, $3)
|
|
}
|
|
| expr
|
|
{
|
|
$$ = append($$, $1)
|
|
}
|
|
|
|
literal:
|
|
STRING
|
|
{
|
|
$$ = &ast.LiteralNode{
|
|
Value: $1.Value.(string),
|
|
Typex: ast.TypeString,
|
|
Posx: $1.Pos,
|
|
}
|
|
}
|
|
|
|
%%
|