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rubynext.y
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rubynext.y
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class Parser::RubyNext
token kCLASS kMODULE kDEF kUNDEF kBEGIN kRESCUE kENSURE kEND kIF kUNLESS
kTHEN kELSIF kELSE kCASE kWHEN kWHILE kUNTIL kFOR kBREAK kNEXT
kREDO kRETRY kIN kDO kDO_COND kDO_BLOCK kDO_LAMBDA kRETURN kYIELD kSUPER
kSELF kNIL kTRUE kFALSE kAND kOR kNOT kIF_MOD kUNLESS_MOD kWHILE_MOD
kUNTIL_MOD kRESCUE_MOD kALIAS kDEFINED klBEGIN klEND k__LINE__
k__FILE__ k__ENCODING__ tIDENTIFIER tFID tGVAR tIVAR tCONSTANT
tLABEL tCVAR tNTH_REF tBACK_REF tSTRING_CONTENT tINTEGER tFLOAT
tUPLUS tUMINUS tUNARY_NUM tPOW tCMP tEQ tEQQ tNEQ
tGEQ tLEQ tANDOP tOROP tMATCH tNMATCH tDOT tDOT2 tDOT3 tAREF
tASET tLSHFT tRSHFT tCOLON2 tCOLON3 tOP_ASGN tASSOC tLPAREN
tLPAREN2 tRPAREN tLPAREN_ARG tLBRACK tLBRACK2 tRBRACK tLBRACE
tLBRACE_ARG tSTAR tSTAR2 tAMPER tAMPER2 tTILDE tPERCENT tDIVIDE
tDSTAR tPLUS tMINUS tLT tGT tPIPE tBANG tCARET tLCURLY tRCURLY
tBACK_REF2 tSYMBEG tSTRING_BEG tXSTRING_BEG tREGEXP_BEG tREGEXP_OPT
tWORDS_BEG tQWORDS_BEG tSYMBOLS_BEG tQSYMBOLS_BEG tSTRING_DBEG
tSTRING_DVAR tSTRING_END tSTRING_DEND tSTRING tSYMBOL
tNL tEH tCOLON tCOMMA tSPACE tSEMI tLAMBDA tLAMBEG tCHARACTER
tRATIONAL tIMAGINARY tLABEL_END tANDDOT tMETHREF tBDOT2 tBDOT3
prechigh
right tBANG tTILDE tUPLUS
right tPOW
right tUNARY_NUM tUMINUS
left tSTAR2 tDIVIDE tPERCENT
left tPLUS tMINUS
left tLSHFT tRSHFT
left tAMPER2
left tPIPE tCARET
left tGT tGEQ tLT tLEQ
nonassoc tCMP tEQ tEQQ tNEQ tMATCH tNMATCH
left tANDOP
left tOROP
nonassoc tDOT2 tDOT3 tBDOT2 tBDOT3
right tEH tCOLON
left kRESCUE_MOD
right tEQL tOP_ASGN
nonassoc kDEFINED
right kNOT
left kOR kAND
nonassoc kIF_MOD kUNLESS_MOD kWHILE_MOD kUNTIL_MOD kIN
nonassoc tLBRACE_ARG
nonassoc tLOWEST
preclow
rule
program: top_compstmt
top_compstmt: top_stmts opt_terms
{
result = @builder.compstmt(val[0])
}
top_stmts: # nothing
{
result = []
}
| top_stmt
{
result = [ val[0] ]
}
| top_stmts terms top_stmt
{
result = val[0] << val[2]
}
| error top_stmt
{
result = [ val[1] ]
}
top_stmt: stmt
| klBEGIN begin_block
{
result = @builder.preexe(val[0], *val[1])
}
begin_block: tLCURLY top_compstmt tRCURLY
{
result = val
}
bodystmt: compstmt opt_rescue opt_else opt_ensure
{
rescue_bodies = val[1]
else_t, else_ = val[2]
ensure_t, ensure_ = val[3]
if rescue_bodies.empty? && !else_t.nil?
diagnostic :error, :useless_else, nil, else_t
end
result = @builder.begin_body(val[0],
rescue_bodies,
else_t, else_,
ensure_t, ensure_)
}
compstmt: stmts opt_terms
{
result = @builder.compstmt(val[0])
}
stmts: # nothing
{
result = []
}
| stmt_or_begin
{
result = [ val[0] ]
}
| stmts terms stmt_or_begin
{
result = val[0] << val[2]
}
| error stmt
{
result = [ val[1] ]
}
stmt_or_begin: stmt
| klBEGIN begin_block
{
diagnostic :error, :begin_in_method, nil, val[0]
}
stmt: kALIAS fitem
{
@lexer.state = :expr_fname
}
fitem
{
result = @builder.alias(val[0], val[1], val[3])
}
| kALIAS tGVAR tGVAR
{
result = @builder.alias(val[0],
@builder.gvar(val[1]),
@builder.gvar(val[2]))
}
| kALIAS tGVAR tBACK_REF
{
result = @builder.alias(val[0],
@builder.gvar(val[1]),
@builder.back_ref(val[2]))
}
| kALIAS tGVAR tNTH_REF
{
diagnostic :error, :nth_ref_alias, nil, val[2]
}
| kUNDEF undef_list
{
result = @builder.undef_method(val[0], val[1])
}
| stmt kIF_MOD expr_value
{
result = @builder.condition_mod(val[0], nil,
val[1], val[2])
}
| stmt kUNLESS_MOD expr_value
{
result = @builder.condition_mod(nil, val[0],
val[1], val[2])
}
| stmt kWHILE_MOD expr_value
{
result = @builder.loop_mod(:while, val[0], val[1], val[2])
}
| stmt kUNTIL_MOD expr_value
{
result = @builder.loop_mod(:until, val[0], val[1], val[2])
}
| stmt kRESCUE_MOD stmt
{
rescue_body = @builder.rescue_body(val[1],
nil, nil, nil,
nil, val[2])
result = @builder.begin_body(val[0], [ rescue_body ])
}
| klEND tLCURLY compstmt tRCURLY
{
result = @builder.postexe(val[0], val[1], val[2], val[3])
}
| command_asgn
| mlhs tEQL command_call
{
result = @builder.multi_assign(val[0], val[1], val[2])
}
| lhs tEQL mrhs
{
result = @builder.assign(val[0], val[1],
@builder.array(nil, val[2], nil))
}
| mlhs tEQL mrhs_arg kRESCUE_MOD stmt
{
rescue_body = @builder.rescue_body(val[3],
nil, nil, nil,
nil, val[4])
begin_body = @builder.begin_body(val[2], [ rescue_body ])
result = @builder.multi_assign(val[0], val[1], begin_body)
}
| mlhs tEQL mrhs_arg
{
result = @builder.multi_assign(val[0], val[1], val[2])
}
| expr
command_asgn: lhs tEQL command_rhs
{
result = @builder.assign(val[0], val[1], val[2])
}
| var_lhs tOP_ASGN command_rhs
{
result = @builder.op_assign(val[0], val[1], val[2])
}
| primary_value tLBRACK2 opt_call_args rbracket tOP_ASGN command_rhs
{
result = @builder.op_assign(
@builder.index(
val[0], val[1], val[2], val[3]),
val[4], val[5])
}
| primary_value call_op tIDENTIFIER tOP_ASGN command_rhs
{
result = @builder.op_assign(
@builder.call_method(
val[0], val[1], val[2]),
val[3], val[4])
}
| primary_value call_op tCONSTANT tOP_ASGN command_rhs
{
result = @builder.op_assign(
@builder.call_method(
val[0], val[1], val[2]),
val[3], val[4])
}
| primary_value tCOLON2 tCONSTANT tOP_ASGN command_rhs
{
const = @builder.const_op_assignable(
@builder.const_fetch(val[0], val[1], val[2]))
result = @builder.op_assign(const, val[3], val[4])
}
| primary_value tCOLON2 tIDENTIFIER tOP_ASGN command_rhs
{
result = @builder.op_assign(
@builder.call_method(
val[0], val[1], val[2]),
val[3], val[4])
}
| backref tOP_ASGN command_rhs
{
@builder.op_assign(val[0], val[1], val[2])
}
command_rhs: command_call =tOP_ASGN
| command_call kRESCUE_MOD stmt
{
rescue_body = @builder.rescue_body(val[1],
nil, nil, nil,
nil, val[2])
result = @builder.begin_body(val[0], [ rescue_body ])
}
| command_asgn
expr: command_call
| expr kAND expr
{
result = @builder.logical_op(:and, val[0], val[1], val[2])
}
| expr kOR expr
{
result = @builder.logical_op(:or, val[0], val[1], val[2])
}
| kNOT opt_nl expr
{
result = @builder.not_op(val[0], nil, val[2], nil)
}
| tBANG command_call
{
result = @builder.not_op(val[0], nil, val[1], nil)
}
| arg kIN
{
@lexer.state = :expr_beg
@lexer.command_start = false
pattern_variables.push
result = @lexer.in_kwarg
@lexer.in_kwarg = true
}
p_expr
{
@lexer.in_kwarg = val[2]
result = @builder.in_match(val[0], val[1], val[3])
}
| arg =tLBRACE_ARG
expr_value: expr
expr_value_do: {
@lexer.cond.push(true)
}
expr_value do
{
@lexer.cond.pop
result = [ val[1], val[2] ]
}
def_name: fname
{
@static_env.extend_static
@lexer.cmdarg.push(false)
@lexer.cond.push(false)
@current_arg_stack.push(nil)
result = val[0]
}
defn_head: kDEF def_name
{
@context.push(:def)
result = [ val[0], val[1] ]
}
defs_head: kDEF singleton dot_or_colon
{
@lexer.state = :expr_fname
}
def_name
{
@context.push(:defs)
result = [ val[0], val[1], val[2], val[4] ]
}
command_call: command
| block_command
block_command: block_call
| block_call dot_or_colon operation2 command_args
{
result = @builder.call_method(val[0], val[1], val[2],
nil, val[3], nil)
}
cmd_brace_block: tLBRACE_ARG
{
@context.push(:block)
}
brace_body tRCURLY
{
result = [ val[0], *val[2], val[3] ]
@context.pop
}
fcall: operation
command: fcall command_args =tLOWEST
{
result = @builder.call_method(nil, nil, val[0],
nil, val[1], nil)
}
| fcall command_args cmd_brace_block
{
method_call = @builder.call_method(nil, nil, val[0],
nil, val[1], nil)
begin_t, args, body, end_t = val[2]
result = @builder.block(method_call,
begin_t, args, body, end_t)
}
| primary_value call_op operation2 command_args =tLOWEST
{
result = @builder.call_method(val[0], val[1], val[2],
nil, val[3], nil)
}
| primary_value call_op operation2 command_args cmd_brace_block
{
method_call = @builder.call_method(val[0], val[1], val[2],
nil, val[3], nil)
begin_t, args, body, end_t = val[4]
result = @builder.block(method_call,
begin_t, args, body, end_t)
}
| primary_value tCOLON2 operation2 command_args =tLOWEST
{
result = @builder.call_method(val[0], val[1], val[2],
nil, val[3], nil)
}
| primary_value tCOLON2 operation2 command_args cmd_brace_block
{
method_call = @builder.call_method(val[0], val[1], val[2],
nil, val[3], nil)
begin_t, args, body, end_t = val[4]
result = @builder.block(method_call,
begin_t, args, body, end_t)
}
| kSUPER command_args
{
result = @builder.keyword_cmd(:super, val[0],
nil, val[1], nil)
}
| kYIELD command_args
{
result = @builder.keyword_cmd(:yield, val[0],
nil, val[1], nil)
}
| k_return call_args
{
result = @builder.keyword_cmd(:return, val[0],
nil, val[1], nil)
}
| kBREAK call_args
{
result = @builder.keyword_cmd(:break, val[0],
nil, val[1], nil)
}
| kNEXT call_args
{
result = @builder.keyword_cmd(:next, val[0],
nil, val[1], nil)
}
mlhs: mlhs_basic
{
result = @builder.multi_lhs(nil, val[0], nil)
}
| tLPAREN mlhs_inner rparen
{
result = @builder.begin(val[0], val[1], val[2])
}
mlhs_inner: mlhs_basic
{
result = @builder.multi_lhs(nil, val[0], nil)
}
| tLPAREN mlhs_inner rparen
{
result = @builder.multi_lhs(val[0], val[1], val[2])
}
mlhs_basic: mlhs_head
| mlhs_head mlhs_item
{
result = val[0].
push(val[1])
}
| mlhs_head tSTAR mlhs_node
{
result = val[0].
push(@builder.splat(val[1], val[2]))
}
| mlhs_head tSTAR mlhs_node tCOMMA mlhs_post
{
result = val[0].
push(@builder.splat(val[1], val[2])).
concat(val[4])
}
| mlhs_head tSTAR
{
result = val[0].
push(@builder.splat(val[1]))
}
| mlhs_head tSTAR tCOMMA mlhs_post
{
result = val[0].
push(@builder.splat(val[1])).
concat(val[3])
}
| tSTAR mlhs_node
{
result = [ @builder.splat(val[0], val[1]) ]
}
| tSTAR mlhs_node tCOMMA mlhs_post
{
result = [ @builder.splat(val[0], val[1]),
*val[3] ]
}
| tSTAR
{
result = [ @builder.splat(val[0]) ]
}
| tSTAR tCOMMA mlhs_post
{
result = [ @builder.splat(val[0]),
*val[2] ]
}
mlhs_item: mlhs_node
| tLPAREN mlhs_inner rparen
{
result = @builder.begin(val[0], val[1], val[2])
}
mlhs_head: mlhs_item tCOMMA
{
result = [ val[0] ]
}
| mlhs_head mlhs_item tCOMMA
{
result = val[0] << val[1]
}
mlhs_post: mlhs_item
{
result = [ val[0] ]
}
| mlhs_post tCOMMA mlhs_item
{
result = val[0] << val[2]
}
mlhs_node: user_variable
{
result = @builder.assignable(val[0])
}
| keyword_variable
{
result = @builder.assignable(val[0])
}
| primary_value tLBRACK2 opt_call_args rbracket
{
result = @builder.index_asgn(val[0], val[1], val[2], val[3])
}
| primary_value call_op tIDENTIFIER
{
if (val[1][0] == :anddot)
diagnostic :error, :csend_in_lhs_of_masgn, nil, val[1]
end
result = @builder.attr_asgn(val[0], val[1], val[2])
}
| primary_value tCOLON2 tIDENTIFIER
{
result = @builder.attr_asgn(val[0], val[1], val[2])
}
| primary_value call_op tCONSTANT
{
if (val[1][0] == :anddot)
diagnostic :error, :csend_in_lhs_of_masgn, nil, val[1]
end
result = @builder.attr_asgn(val[0], val[1], val[2])
}
| primary_value tCOLON2 tCONSTANT
{
result = @builder.assignable(
@builder.const_fetch(val[0], val[1], val[2]))
}
| tCOLON3 tCONSTANT
{
result = @builder.assignable(
@builder.const_global(val[0], val[1]))
}
| backref
{
result = @builder.assignable(val[0])
}
lhs: user_variable
{
result = @builder.assignable(val[0])
}
| keyword_variable
{
result = @builder.assignable(val[0])
}
| primary_value tLBRACK2 opt_call_args rbracket
{
result = @builder.index_asgn(val[0], val[1], val[2], val[3])
}
| primary_value call_op tIDENTIFIER
{
result = @builder.attr_asgn(val[0], val[1], val[2])
}
| primary_value tCOLON2 tIDENTIFIER
{
result = @builder.attr_asgn(val[0], val[1], val[2])
}
| primary_value call_op tCONSTANT
{
result = @builder.attr_asgn(val[0], val[1], val[2])
}
| primary_value tCOLON2 tCONSTANT
{
result = @builder.assignable(
@builder.const_fetch(val[0], val[1], val[2]))
}
| tCOLON3 tCONSTANT
{
result = @builder.assignable(
@builder.const_global(val[0], val[1]))
}
| backref
{
result = @builder.assignable(val[0])
}
cname: tIDENTIFIER
{
diagnostic :error, :module_name_const, nil, val[0]
}
| tCONSTANT
cpath: tCOLON3 cname
{
result = @builder.const_global(val[0], val[1])
}
| cname
{
result = @builder.const(val[0])
}
| primary_value tCOLON2 cname
{
result = @builder.const_fetch(val[0], val[1], val[2])
}
fname: tIDENTIFIER | tCONSTANT | tFID
| op
| reswords
fitem: fname
{
result = @builder.symbol(val[0])
}
| symbol
undef_list: fitem
{
result = [ val[0] ]
}
| undef_list tCOMMA
{
@lexer.state = :expr_fname
}
fitem
{
result = val[0] << val[3]
}
op: tPIPE | tCARET | tAMPER2 | tCMP | tEQ | tEQQ
| tMATCH | tNMATCH | tGT | tGEQ | tLT | tLEQ
| tNEQ | tLSHFT | tRSHFT | tPLUS | tMINUS | tSTAR2
| tSTAR | tDIVIDE | tPERCENT | tPOW | tBANG | tTILDE
| tUPLUS | tUMINUS | tAREF | tASET | tDSTAR | tBACK_REF2
reswords: k__LINE__ | k__FILE__ | k__ENCODING__ | klBEGIN | klEND
| kALIAS | kAND | kBEGIN | kBREAK | kCASE
| kCLASS | kDEF | kDEFINED | kDO | kELSE
| kELSIF | kEND | kENSURE | kFALSE | kFOR
| kIN | kMODULE | kNEXT | kNIL | kNOT
| kOR | kREDO | kRESCUE | kRETRY | kRETURN
| kSELF | kSUPER | kTHEN | kTRUE | kUNDEF
| kWHEN | kYIELD | kIF | kUNLESS | kWHILE
| kUNTIL
arg: lhs tEQL arg_rhs
{
result = @builder.assign(val[0], val[1], val[2])
}
| var_lhs tOP_ASGN arg_rhs
{
result = @builder.op_assign(val[0], val[1], val[2])
}
| primary_value tLBRACK2 opt_call_args rbracket tOP_ASGN arg_rhs
{
result = @builder.op_assign(
@builder.index(
val[0], val[1], val[2], val[3]),
val[4], val[5])
}
| primary_value call_op tIDENTIFIER tOP_ASGN arg_rhs
{
result = @builder.op_assign(
@builder.call_method(
val[0], val[1], val[2]),
val[3], val[4])
}
| primary_value call_op tCONSTANT tOP_ASGN arg_rhs
{
result = @builder.op_assign(
@builder.call_method(
val[0], val[1], val[2]),
val[3], val[4])
}
| primary_value tCOLON2 tIDENTIFIER tOP_ASGN arg_rhs
{
result = @builder.op_assign(
@builder.call_method(
val[0], val[1], val[2]),
val[3], val[4])
}
| primary_value tCOLON2 tCONSTANT tOP_ASGN arg_rhs
{
const = @builder.const_op_assignable(
@builder.const_fetch(val[0], val[1], val[2]))
result = @builder.op_assign(const, val[3], val[4])
}
| tCOLON3 tCONSTANT tOP_ASGN arg_rhs
{
const = @builder.const_op_assignable(
@builder.const_global(val[0], val[1]))
result = @builder.op_assign(const, val[2], val[3])
}
| backref tOP_ASGN arg_rhs
{
result = @builder.op_assign(val[0], val[1], val[2])
}
| arg tDOT2 arg
{
result = @builder.range_inclusive(val[0], val[1], val[2])
}
| arg tDOT3 arg
{
result = @builder.range_exclusive(val[0], val[1], val[2])
}
| arg tDOT2
{
result = @builder.range_inclusive(val[0], val[1], nil)
}
| arg tDOT3
{
result = @builder.range_exclusive(val[0], val[1], nil)
}
| tBDOT2 arg
{
result = @builder.range_inclusive(nil, val[0], val[1])
}
| tBDOT3 arg
{
result = @builder.range_exclusive(nil, val[0], val[1])
}
| arg tPLUS arg
{
result = @builder.binary_op(val[0], val[1], val[2])
}
| arg tMINUS arg
{
result = @builder.binary_op(val[0], val[1], val[2])
}
| arg tSTAR2 arg
{
result = @builder.binary_op(val[0], val[1], val[2])
}
| arg tDIVIDE arg
{
result = @builder.binary_op(val[0], val[1], val[2])
}
| arg tPERCENT arg
{
result = @builder.binary_op(val[0], val[1], val[2])
}
| arg tPOW arg
{
result = @builder.binary_op(val[0], val[1], val[2])
}
| tUNARY_NUM simple_numeric tPOW arg
{
result = @builder.unary_op(val[0],
@builder.binary_op(
val[1], val[2], val[3]))
}
| tUPLUS arg
{
result = @builder.unary_op(val[0], val[1])
}
| tUMINUS arg
{
result = @builder.unary_op(val[0], val[1])
}
| arg tPIPE arg
{
result = @builder.binary_op(val[0], val[1], val[2])
}
| arg tCARET arg
{
result = @builder.binary_op(val[0], val[1], val[2])
}
| arg tAMPER2 arg
{
result = @builder.binary_op(val[0], val[1], val[2])
}
| arg tCMP arg
{
result = @builder.binary_op(val[0], val[1], val[2])
}
| rel_expr =tCMP
| arg tEQ arg
{
result = @builder.binary_op(val[0], val[1], val[2])
}
| arg tEQQ arg
{
result = @builder.binary_op(val[0], val[1], val[2])
}
| arg tNEQ arg
{
result = @builder.binary_op(val[0], val[1], val[2])
}
| arg tMATCH arg
{
result = @builder.match_op(val[0], val[1], val[2])
}
| arg tNMATCH arg
{
result = @builder.binary_op(val[0], val[1], val[2])
}
| tBANG arg
{
result = @builder.not_op(val[0], nil, val[1], nil)
}
| tTILDE arg
{
result = @builder.unary_op(val[0], val[1])
}
| arg tLSHFT arg
{
result = @builder.binary_op(val[0], val[1], val[2])
}
| arg tRSHFT arg
{
result = @builder.binary_op(val[0], val[1], val[2])
}
| arg tANDOP arg
{
result = @builder.logical_op(:and, val[0], val[1], val[2])
}
| arg tOROP arg
{
result = @builder.logical_op(:or, val[0], val[1], val[2])
}
| kDEFINED opt_nl arg
{
result = @builder.keyword_cmd(:defined?, val[0], nil, [ val[2] ], nil)
}
| arg tEH arg opt_nl tCOLON arg
{
result = @builder.ternary(val[0], val[1],
val[2], val[4], val[5])
}
| defn_head f_arglist_opt tEQL arg
{
result = @builder.def_endless_method(*val[0],
val[1], val[2], val[3])
@lexer.cmdarg.pop
@lexer.cond.pop
@static_env.unextend
@context.pop
@current_arg_stack.pop
}
| defs_head f_arglist_opt tEQL arg
{
result = @builder.def_endless_singleton(*val[0],
val[1], val[2], val[3])
@lexer.cmdarg.pop
@lexer.cond.pop
@static_env.unextend
@context.pop
@current_arg_stack.pop
}
| primary
relop: tGT | tLT | tGEQ | tLEQ
rel_expr: arg relop arg =tGT
{
result = @builder.binary_op(val[0], val[1], val[2])
}
| rel_expr relop arg =tGT
{
result = @builder.binary_op(val[0], val[1], val[2])
}
arg_value: arg
aref_args: none
| args trailer
| args tCOMMA assocs trailer
{
result = val[0] << @builder.associate(nil, val[2], nil)
}
| assocs trailer
{
result = [ @builder.associate(nil, val[0], nil) ]
}
arg_rhs: arg =tOP_ASGN
| arg kRESCUE_MOD arg
{
rescue_body = @builder.rescue_body(val[1],
nil, nil, nil,
nil, val[2])
result = @builder.begin_body(val[0], [ rescue_body ])
}
paren_args: tLPAREN2 opt_call_args rparen
{
result = val
}
| tLPAREN2 args_forward rparen
{
unless @static_env.declared_forward_args?
diagnostic :error, :unexpected_token, { :token => 'tBDOT3' } , val[1]
end
result = [val[0], [@builder.forwarded_args(val[1])], val[2]]
}
opt_paren_args: # nothing
{
result = [ nil, [], nil ]
}
| paren_args
opt_call_args: # nothing
{
result = []
}
| call_args
| args tCOMMA
| args tCOMMA assocs tCOMMA
{
result = val[0] << @builder.associate(nil, val[2], nil)
}
| assocs tCOMMA
{
result = [ @builder.associate(nil, val[0], nil) ]
}
call_args: command
{
result = [ val[0] ]
}
| args opt_block_arg
{
result = val[0].concat(val[1])
}
| assocs opt_block_arg
{
result = [ @builder.associate(nil, val[0], nil) ]
result.concat(val[1])
}
| args tCOMMA assocs opt_block_arg
{
assocs = @builder.associate(nil, val[2], nil)
result = val[0] << assocs
result.concat(val[3])
}
| block_arg
{
result = [ val[0] ]
}
command_args: {
# When branch gets invoked by RACC's lookahead
# and command args start with '[' or '('
# we need to put `true` to the cmdarg stack
# **before** `false` pushed by lexer
# m [], n
# ^
# Right here we have cmdarg [...0] because
# lexer pushed it on '['
# We need to modify cmdarg stack to [...10]
#
# For all other cases (like `m n` or `m n, []`) we simply put 1 to the stack
# and later lexer pushes corresponding bits on top of it.
last_token = @last_token[0]
lookahead = last_token == :tLBRACK || last_token == :tLPAREN_ARG
if lookahead
top = @lexer.cmdarg.pop
@lexer.cmdarg.push(true)
@lexer.cmdarg.push(top)
else
@lexer.cmdarg.push(true)
end
}
call_args
{
# call_args can be followed by tLBRACE_ARG (that does cmdarg.push(0) in the lexer)
# but the push must be done after cmdarg.pop() in the parser.
# So this code does cmdarg.pop() to pop 0 pushed by tLBRACE_ARG,
# cmdarg.pop() to pop 1 pushed by command_args,
# and cmdarg.push(0) to restore back the flag set by tLBRACE_ARG.
last_token = @last_token[0]
lookahead = last_token == :tLBRACE_ARG
if lookahead
top = @lexer.cmdarg.pop
@lexer.cmdarg.pop