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6246f6e815
This contains a new, hand-written expression parser to replace the old
hack language based on string munging. The new approach is a simple
AST-based evaluation approach, instead of the "list of operations"
infix-based hack that there was before.
The new language for configuration has support for parentheses, and
counts "!" as a unary operator instead of the binary "NOT OR" operator
it was before. A simple example:
(X & Y) | !B
Explicit device references, and complex device names ("Right Y+") are
handled with backticks and colons:
(`SDL/0/6 axis joystick:Right X+` & `DInput/0/Keyboard Mouse:A`)
The basic editor UI that inserts tokens has not been updated to reflect
the new language.
73 lines
1.4 KiB
C++
73 lines
1.4 KiB
C++
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#ifndef _EXPRESSIONPARSER_H_
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#define _EXPRESSIONPARSER_H_
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#include <string>
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#include "Device.h"
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namespace ciface
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{
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namespace ExpressionParser
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{
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class ControlQualifier
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{
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public:
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bool has_device;
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Core::DeviceQualifier device_qualifier;
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std::string control_name;
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ControlQualifier() : has_device(false) {}
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operator std::string()
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{
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if (has_device)
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return device_qualifier.ToString() + ":" + control_name;
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else
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return control_name;
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}
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};
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class ControlFinder
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{
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public:
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ControlFinder(const Core::DeviceContainer &container_, const Core::DeviceQualifier &default_, const bool is_input_) : container(container_), default_device(default_), is_input(is_input_) {}
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Core::Device::Control *FindControl(ControlQualifier qualifier);
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private:
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Core::Device *FindDevice(ControlQualifier qualifier);
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const Core::DeviceContainer &container;
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const Core::DeviceQualifier &default_device;
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bool is_input;
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};
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class Parser;
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class ExpressionNode;
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class Expression
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{
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friend class Parser;
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public:
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Expression() : expr(NULL) {}
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~Expression();
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ControlState GetValue();
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void SetValue (ControlState state);
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int num_controls;
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private:
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ExpressionNode *expr;
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};
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enum ExpressionParseStatus
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{
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EXPRESSION_PARSE_SUCCESS = 0,
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EXPRESSION_PARSE_SYNTAX_ERROR,
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EXPRESSION_PARSE_NO_DEVICE,
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};
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ExpressionParseStatus ParseExpression(std::string expr, ControlFinder &finder, Expression **expr_out);
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}
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}
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#endif
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