xtemplate/lib/xtemplate/compiler/ast.js

eXtensible Template Engine lib on browser and nodejs. support async control, inheritance, include, logic expression, custom function and more.

/**
 * Ast node class for xtemplate
 * @author yiminghe@gmail.com
 * @ignore
 */
var ast = {};

function sameArray(a1, a2) {
    var l1 = a1.length, l2 = a2.length;
    if (l1 !== l2) {
        return 0;
    }
    for (var i = 0; i < l1; i++) {
        if (a1[i] !== a2[i]) {
            return 0;
        }
    }
    return 1;
}

ast.ProgramNode = function (pos, statements, inverse) {
    var self = this;
    self.pos = pos;
    self.statements = statements;
    self.inverse = inverse;
};

ast.ProgramNode.prototype.type = 'program';

ast.BlockStatement = function (pos, func, program, close, escape) {
    var closeParts = close.parts,
        self = this,
        e;
    // no close tag
    if (!sameArray(func.id.parts, closeParts)) {
        e = ('Syntax error at line ' +
            pos.line +
            ', col ' + pos.col + ':\n' + 'expect {{/' +
            func.id.parts +
            '}} not {{/' +
            closeParts + '}}');
        throw new Error(e);
    }
    self.escape = escape;
    self.pos = pos;
    self.func = func;
    self.program = program;
};

ast.BlockStatement.prototype.type = 'blockStatement';

ast.ExpressionStatement = function (pos, expression, escape) {
    var self = this;
    self.pos = pos;
    self.value = expression;
    self.escape = escape;
};

ast.ExpressionStatement.prototype.type = 'expressionStatement';

ast.ContentStatement = function (pos, value) {
    var self = this;
    self.pos = pos;
    self.value = value;
};

ast.ContentStatement.prototype.type = 'contentStatement';

ast.UnaryExpression = function (unaryType, v) {
    this.value = v;
    this.unaryType = unaryType;
};

ast.Function = function (pos, id, params, hash) {
    var self = this;
    self.pos = pos;
    self.id = id;
    self.params = params;
    self.hash = hash;
};

ast.Function.prototype.type = 'function';

ast.UnaryExpression.prototype.type = 'unaryExpression';

ast.MultiplicativeExpression = function (op1, opType, op2) {
    var self = this;
    self.op1 = op1;
    self.opType = opType;
    self.op2 = op2;
};

ast.MultiplicativeExpression.prototype.type = 'multiplicativeExpression';

ast.AdditiveExpression = function (op1, opType, op2) {
    var self = this;
    self.op1 = op1;
    self.opType = opType;
    self.op2 = op2;
};

ast.AdditiveExpression.prototype.type = 'additiveExpression';

ast.RelationalExpression = function (op1, opType, op2) {
    var self = this;
    self.op1 = op1;
    self.opType = opType;
    self.op2 = op2;
};

ast.RelationalExpression.prototype.type = 'relationalExpression';

ast.EqualityExpression = function (op1, opType, op2) {
    var self = this;
    self.op1 = op1;
    self.opType = opType;
    self.op2 = op2;
};

ast.EqualityExpression.prototype.type = 'equalityExpression';

ast.ConditionalAndExpression = function (op1, op2) {
    var self = this;
    self.op1 = op1;
    self.op2 = op2;
    self.opType = '&&';
};

ast.ConditionalAndExpression.prototype.type = 'conditionalAndExpression';

ast.ConditionalOrExpression = function (op1, op2) {
    var self = this;
    self.op1 = op1;
    self.op2 = op2;
    self.opType = '||';
};

ast.ConditionalOrExpression.prototype.type = 'conditionalOrExpression';

ast.String = function (pos, value) {
    var self = this;
    self.pos = pos;
    self.value = value;
};

ast.String.prototype.type = 'string';

ast.Number = function (pos, value) {
    var self = this;
    self.pos = pos;
    self.value = value;
};

ast.Number.prototype.type = 'number';

ast.Hash = function (pos) {
    var self = this;
    var value = {};
    self.pos = pos;
    self.value = value;
};

ast.Hash.prototype.type = 'hash';

ast.ArrayExpression = function (list) {
    this.list = list;
};

ast.ArrayExpression.prototype.type = 'arrayExpression';

ast.JsonExpression = function (json) {
    this.json = json;
};

ast.JsonExpression.prototype.type = 'jsonExpression';

ast.Id = function (pos, raw) {
    var self = this;
    var parts = [];
    var depth = 0;
    self.pos = pos;
    for (var i = 0, l = raw.length; i < l; i++) {
        var p = raw[i];
        if (p === '..') {
            depth++;
        } else {
            parts.push(p);
        }
    }
    self.parts = parts;
    self.string = parts.join('.');
    self.depth = depth;
};

ast.Id.prototype.type = 'id';

module.exports = ast;