mirror of
https://github.com/CHOMPStation2/CHOMPStation2.git
synced 2025-12-10 02:09:41 +00:00
e158fcd3cc
* A preface to my madness Travis failed one of my PR's because I copied old code that used /red /blue /green. Because of this, I am going to find and replace every instance of it that I find. Also this is a test commit to make sure I'm comitting to the correct branch. * /blue /green /red replacements Dear god. A slow and painful death from acid is more fun than this. I wouldn't wish this torture on my worst enemy. And this is only the beginning * Replace part 2. Time to fix the human error. * Fixes mismatches * Sets macro count to 220 One above the current number of macros in the code. * Fixes last of the mismatches. * Removes spaces, replaces \black Removes spaces Replaces \black in a few areas where seen Replaces \bold with <B> </B> where seen * Updating macro count again * More fixes! * Issues fixed! For real this time! I swear! * Fixing all the merge conflict files.
531 lines
10 KiB
Plaintext
531 lines
10 KiB
Plaintext
//I'm pretty sure that this is a recursive [s]descent[/s] ascent parser.
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//Spec
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//////////
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//
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// query : select_query | delete_query | update_query | call_query | explain
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// explain : 'EXPLAIN' query
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//
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// select_query : 'SELECT' select_list [('FROM' | 'IN') from_list] ['WHERE' bool_expression]
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// delete_query : 'DELETE' select_list [('FROM' | 'IN') from_list] ['WHERE' bool_expression]
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// update_query : 'UPDATE' select_list [('FROM' | 'IN') from_list] 'SET' assignments ['WHERE' bool_expression]
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// call_query : 'CALL' call_function ['ON' select_list [('FROM' | 'IN') from_list] ['WHERE' bool_expression]]
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//
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// select_list : select_item [',' select_list]
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// select_item : '*' | select_function | object_type
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// select_function : count_function
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// count_function : 'COUNT' '(' '*' ')' | 'COUNT' '(' object_types ')'
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//
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// from_list : from_item [',' from_list]
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// from_item : 'world' | object_type
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//
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// call_function : <function name> ['(' [arguments] ')']
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// arguments : expression [',' arguments]
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//
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// object_type : <type path> | string
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//
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// assignments : assignment, [',' assignments]
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// assignment : <variable name> '=' expression
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// variable : <variable name> | <variable name> '.' variable
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//
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// bool_expression : expression comparitor expression [bool_operator bool_expression]
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// expression : ( unary_expression | '(' expression ')' | value ) [binary_operator expression]
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// unary_expression : unary_operator ( unary_expression | value | '(' expression ')' )
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// comparitor : '=' | '==' | '!=' | '<>' | '<' | '<=' | '>' | '>='
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// value : variable | string | number | 'null'
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// unary_operator : '!' | '-' | '~'
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// binary_operator : comparitor | '+' | '-' | '/' | '*' | '&' | '|' | '^'
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// bool_operator : 'AND' | '&&' | 'OR' | '||'
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//
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// string : ''' <some text> ''' | '"' <some text > '"'
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// number : <some digits>
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//
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//////////
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/datum/SDQL_parser
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var/query_type
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var/error = 0
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var/list/query
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var/list/tree
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var/list/select_functions = list("count")
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var/list/boolean_operators = list("and", "or", "&&", "||")
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var/list/unary_operators = list("!", "-", "~")
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var/list/binary_operators = list("+", "-", "/", "*", "&", "|", "^")
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var/list/comparitors = list("=", "==", "!=", "<>", "<", "<=", ">", ">=")
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/datum/SDQL_parser/New(query_list)
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query = query_list
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/datum/SDQL_parser/proc/parse_error(error_message)
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error = 1
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usr << "<font color='red'>SQDL2 Parsing Error: [error_message]</font>"
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return query.len + 1
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/datum/SDQL_parser/proc/parse()
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tree = list()
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query(1, tree)
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if(error)
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return list()
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else
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return tree
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/datum/SDQL_parser/proc/token(i)
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if(i <= query.len)
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return query[i]
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else
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return null
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/datum/SDQL_parser/proc/tokens(i, num)
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if(i + num <= query.len)
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return query.Copy(i, i + num)
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else
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return null
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/datum/SDQL_parser/proc/tokenl(i)
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return lowertext(token(i))
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/datum/SDQL_parser/proc
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//query: select_query | delete_query | update_query
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query(i, list/node)
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query_type = tokenl(i)
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switch(query_type)
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if("select")
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select_query(i, node)
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if("delete")
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delete_query(i, node)
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if("update")
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update_query(i, node)
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if("call")
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call_query(i, node)
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if("explain")
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node += "explain"
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node["explain"] = list()
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query(i + 1, node["explain"])
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// select_query: 'SELECT' select_list [('FROM' | 'IN') from_list] ['WHERE' bool_expression]
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select_query(i, list/node)
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var/list/select = list()
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i = select_list(i + 1, select)
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node += "select"
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node["select"] = select
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var/list/from = list()
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if(tokenl(i) in list("from", "in"))
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i = from_list(i + 1, from)
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else
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from += "world"
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node += "from"
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node["from"] = from
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if(tokenl(i) == "where")
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var/list/where = list()
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i = bool_expression(i + 1, where)
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node += "where"
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node["where"] = where
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return i
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//delete_query: 'DELETE' select_list [('FROM' | 'IN') from_list] ['WHERE' bool_expression]
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delete_query(i, list/node)
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var/list/select = list()
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i = select_list(i + 1, select)
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node += "delete"
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node["delete"] = select
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var/list/from = list()
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if(tokenl(i) in list("from", "in"))
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i = from_list(i + 1, from)
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else
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from += "world"
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node += "from"
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node["from"] = from
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if(tokenl(i) == "where")
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var/list/where = list()
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i = bool_expression(i + 1, where)
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node += "where"
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node["where"] = where
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return i
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//update_query: 'UPDATE' select_list [('FROM' | 'IN') from_list] 'SET' assignments ['WHERE' bool_expression]
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update_query(i, list/node)
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var/list/select = list()
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i = select_list(i + 1, select)
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node += "update"
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node["update"] = select
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var/list/from = list()
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if(tokenl(i) in list("from", "in"))
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i = from_list(i + 1, from)
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else
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from += "world"
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node += "from"
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node["from"] = from
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if(tokenl(i) != "set")
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i = parse_error("UPDATE has misplaced SET")
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var/list/set_assignments = list()
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i = assignments(i + 1, set_assignments)
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node += "set"
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node["set"] = set_assignments
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if(tokenl(i) == "where")
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var/list/where = list()
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i = bool_expression(i + 1, where)
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node += "where"
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node["where"] = where
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return i
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//call_query: 'CALL' call_function ['ON' select_list [('FROM' | 'IN') from_list] ['WHERE' bool_expression]]
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call_query(i, list/node)
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var/list/func = list()
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i = call_function(i + 1, func)
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node += "call"
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node["call"] = func
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if(tokenl(i) != "on")
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return i
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var/list/select = list()
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i = select_list(i + 1, select)
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node += "on"
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node["on"] = select
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var/list/from = list()
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if(tokenl(i) in list("from", "in"))
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i = from_list(i + 1, from)
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else
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from += "world"
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node += "from"
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node["from"] = from
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if(tokenl(i) == "where")
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var/list/where = list()
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i = bool_expression(i + 1, where)
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node += "where"
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node["where"] = where
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return i
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//select_list: select_item [',' select_list]
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select_list(i, list/node)
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i = select_item(i, node)
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if(token(i) == ",")
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i = select_list(i + 1, node)
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return i
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//from_list: from_item [',' from_list]
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from_list(i, list/node)
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i = from_item(i, node)
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if(token(i) == ",")
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i = from_list(i + 1, node)
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return i
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//assignments: assignment, [',' assignments]
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assignments(i, list/node)
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i = assignment(i, node)
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if(token(i) == ",")
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i = assignments(i + 1, node)
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return i
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//select_item: '*' | select_function | object_type
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select_item(i, list/node)
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if(token(i) == "*")
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node += "*"
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i++
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else if(tokenl(i) in select_functions)
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i = select_function(i, node)
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else
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i = object_type(i, node)
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return i
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//from_item: 'world' | object_type
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from_item(i, list/node)
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if(token(i) == "world")
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node += "world"
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i++
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else
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i = object_type(i, node)
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return i
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//bool_expression: expression [bool_operator bool_expression]
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bool_expression(i, list/node)
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var/list/bool = list()
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i = expression(i, bool)
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node[++node.len] = bool
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if(tokenl(i) in boolean_operators)
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i = bool_operator(i, node)
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i = bool_expression(i, node)
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return i
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//assignment: <variable name> '=' expression
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assignment(i, list/node)
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node += token(i)
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if(token(i + 1) == "=")
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var/varname = token(i)
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node[varname] = list()
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i = expression(i + 2, node[varname])
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else
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parse_error("Assignment expected, but no = found")
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return i
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//variable: <variable name> | <variable name> '.' variable
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variable(i, list/node)
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var/list/L = list(token(i))
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node[++node.len] = L
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if(token(i + 1) == ".")
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L += "."
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i = variable(i + 2, L)
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else
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i++
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return i
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//object_type: <type path> | string
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object_type(i, list/node)
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if(copytext(token(i), 1, 2) == "/")
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node += token(i)
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else
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i = string(i, node)
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return i + 1
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//comparitor: '=' | '==' | '!=' | '<>' | '<' | '<=' | '>' | '>='
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comparitor(i, list/node)
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if(token(i) in list("=", "==", "!=", "<>", "<", "<=", ">", ">="))
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node += token(i)
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else
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parse_error("Unknown comparitor [token(i)]")
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return i + 1
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//bool_operator: 'AND' | '&&' | 'OR' | '||'
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bool_operator(i, list/node)
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if(tokenl(i) in list("and", "or", "&&", "||"))
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node += token(i)
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else
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parse_error("Unknown comparitor [token(i)]")
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return i + 1
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//string: ''' <some text> ''' | '"' <some text > '"'
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string(i, list/node)
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if(copytext(token(i), 1, 2) in list("'", "\""))
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node += token(i)
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else
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parse_error("Expected string but found '[token(i)]'")
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return i + 1
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//call_function: <function name> ['(' [arguments] ')']
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call_function(i, list/node)
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parse_error("Sorry, function calls aren't available yet")
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return i
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//select_function: count_function
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select_function(i, list/node)
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parse_error("Sorry, function calls aren't available yet")
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return i
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//expression: ( unary_expression | '(' expression ')' | value ) [binary_operator expression]
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expression(i, list/node)
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if(token(i) in unary_operators)
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i = unary_expression(i, node)
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else if(token(i) == "(")
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var/list/expr = list()
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i = expression(i + 1, expr)
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if(token(i) != ")")
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parse_error("Missing ) at end of expression.")
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else
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i++
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node[++node.len] = expr
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else
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i = value(i, node)
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if(token(i) in binary_operators)
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i = binary_operator(i, node)
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i = expression(i, node)
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else if(token(i) in comparitors)
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i = binary_operator(i, node)
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var/list/rhs = list()
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i = expression(i, rhs)
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node[++node.len] = rhs
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return i
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//unary_expression: unary_operator ( unary_expression | value | '(' expression ')' )
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unary_expression(i, list/node)
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if(token(i) in unary_operators)
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var/list/unary_exp = list()
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unary_exp += token(i)
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i++
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if(token(i) in unary_operators)
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i = unary_expression(i, unary_exp)
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else if(token(i) == "(")
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var/list/expr = list()
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i = expression(i + 1, expr)
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if(token(i) != ")")
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parse_error("Missing ) at end of expression.")
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else
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i++
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unary_exp[++unary_exp.len] = expr
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else
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i = value(i, unary_exp)
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node[++node.len] = unary_exp
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else
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parse_error("Expected unary operator but found '[token(i)]'")
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return i
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//binary_operator: comparitor | '+' | '-' | '/' | '*' | '&' | '|' | '^'
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binary_operator(i, list/node)
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if(token(i) in (binary_operators + comparitors))
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node += token(i)
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else
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parse_error("Unknown binary operator [token(i)]")
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return i + 1
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//value: variable | string | number | 'null'
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value(i, list/node)
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if(token(i) == "null")
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node += "null"
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i++
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else if(isnum(text2num(token(i))))
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node += text2num(token(i))
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i++
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else if(copytext(token(i), 1, 2) in list("'", "\""))
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i = string(i, node)
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else
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i = variable(i, node)
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return i
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/*EXPLAIN SELECT * WHERE 42 = 6 * 9 OR val = - 5 == 7*/ |